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RSS2018 Vol. 5, No. S1
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2018, 5(S1): 1-6.
doi: 10.16516/j.gedi.issn2095-8676.2018.S1.001
Abstract:
[Introduction] Considering randomness and intermittency of wind power generation, solar power generation and other renewable energy seriously affect the stability of power system, influence of micro grid containing wind, photovoltaic and storage on power grid security and stability is researched in this paper. [Method] First, wind system, photovoltaic system and the concrete microgrid network simulation model were established using DIgSILENT, and then steady-state and electromechanical transient calculations were carried out and corresponding control strategies were proposed. [Result] In the end, the general principles of control strategies about distributed generation, storage device and overall micro-grid system were proposed. [Conclusion] This research result provides some guidance for control strategies for micro-grid.
[Introduction] Considering randomness and intermittency of wind power generation, solar power generation and other renewable energy seriously affect the stability of power system, influence of micro grid containing wind, photovoltaic and storage on power grid security and stability is researched in this paper. [Method] First, wind system, photovoltaic system and the concrete microgrid network simulation model were established using DIgSILENT, and then steady-state and electromechanical transient calculations were carried out and corresponding control strategies were proposed. [Result] In the end, the general principles of control strategies about distributed generation, storage device and overall micro-grid system were proposed. [Conclusion] This research result provides some guidance for control strategies for micro-grid.
2018, 5(S1): 7-14.
doi: 10.16516/j.gedi.issn2095-8676.2018.S1.002
Abstract:
[Introduction] In response to the call of national energy-saving and environmental protection, and to promote the promotion and application of new energy vehicles, local governments have steadily increased policy support, which has strongly promoted the development of charging infrastructure for electric vehicles. With the increasing number of large industrial parks in China, the rational layout of charging infrastructure for electric vehicles in advance will promote the power supply in the parks. The rapid development of electric vehicles is of great significance. [Method] The charging characteristics and driving characteristics of electric vehicles were analyzed, and then a comprehensive optimal model of charging station construction cost and charging cost was established. Considering the grid layout method of charging facilities based on Geographic Information System, the Pareto algorithm was adopted to improve the optimization of charging facilities. Secondly, according to different charging time and charging cost, the investment payback period of electric vehicle charging facilities was compared and analyzed. [Result] The results show that the optimal plan of regional charging facilities layout and construction is obtained, which can improve the utilization efficiency of charging facilities and equipment, improve the investment efficiency, and enhance charging facilities. [Conclusion] The feasibility and validity of this planning scheme are demonstrated by comparing and analyzing the case of charging station planning in an industrial park in the Pearl River Delta.
[Introduction] In response to the call of national energy-saving and environmental protection, and to promote the promotion and application of new energy vehicles, local governments have steadily increased policy support, which has strongly promoted the development of charging infrastructure for electric vehicles. With the increasing number of large industrial parks in China, the rational layout of charging infrastructure for electric vehicles in advance will promote the power supply in the parks. The rapid development of electric vehicles is of great significance. [Method] The charging characteristics and driving characteristics of electric vehicles were analyzed, and then a comprehensive optimal model of charging station construction cost and charging cost was established. Considering the grid layout method of charging facilities based on Geographic Information System, the Pareto algorithm was adopted to improve the optimization of charging facilities. Secondly, according to different charging time and charging cost, the investment payback period of electric vehicle charging facilities was compared and analyzed. [Result] The results show that the optimal plan of regional charging facilities layout and construction is obtained, which can improve the utilization efficiency of charging facilities and equipment, improve the investment efficiency, and enhance charging facilities. [Conclusion] The feasibility and validity of this planning scheme are demonstrated by comparing and analyzing the case of charging station planning in an industrial park in the Pearl River Delta.
2018, 5(S1): 15-18.
doi: 10.16516/j.gedi.issn2095-8676.2018.S1.003
Abstract:
[Introduction] The paper aims to provide a feasible and meaningful reference to electricity transmission investment and power grid reform. [Method] To investigate the mechanism of electricity transmission concession of Peru, we analyzed the regulation, law and revenue mechanism, investment risk. [Result] The results we obtained demonstrate that electricity transmission concession mechanism is mature and reduced the construction cost as well as attracted sufficient investment. [Conclusion] We demonstrate the overall risk of electricity transmission investment is low, but specific risk analysis is must to specific project,this work provides some reference for power grid reform.
[Introduction] The paper aims to provide a feasible and meaningful reference to electricity transmission investment and power grid reform. [Method] To investigate the mechanism of electricity transmission concession of Peru, we analyzed the regulation, law and revenue mechanism, investment risk. [Result] The results we obtained demonstrate that electricity transmission concession mechanism is mature and reduced the construction cost as well as attracted sufficient investment. [Conclusion] We demonstrate the overall risk of electricity transmission investment is low, but specific risk analysis is must to specific project,this work provides some reference for power grid reform.
2018, 5(S1): 19-24.
doi: 10.16516/j.gedi.issn2095-8676.2018.S1.004
Abstract:
[Introduction] Recently, renewable energy generator capacity greatly increase in power market of China. To absorb renewable energy, coal-fired power plants responsible for power grid peak shaving have become a development trend in the future. Coal-fired power plants, which undertake the task load, will run at low load condition for long time and meet a variety of potentially risk to the safe and stable operation. [Method] Major potential risks were detailed analyzed in this paper, such as safety of combustion, furnace and coal pulverizing system explosion and stability of hydro-power. [Result] Then, main reform technology for safe and stable operation under lower load condition were summarized and discussed from the process system design, operation mode and control system design. This paper proposed systematic solutions of safe and stable operation under lower load condition for coal-fired power plant. [Conclusion] This paper can provide suggestion and reference for implementation of wide-load technical transformation for coal-fired power plants.
[Introduction] Recently, renewable energy generator capacity greatly increase in power market of China. To absorb renewable energy, coal-fired power plants responsible for power grid peak shaving have become a development trend in the future. Coal-fired power plants, which undertake the task load, will run at low load condition for long time and meet a variety of potentially risk to the safe and stable operation. [Method] Major potential risks were detailed analyzed in this paper, such as safety of combustion, furnace and coal pulverizing system explosion and stability of hydro-power. [Result] Then, main reform technology for safe and stable operation under lower load condition were summarized and discussed from the process system design, operation mode and control system design. This paper proposed systematic solutions of safe and stable operation under lower load condition for coal-fired power plant. [Conclusion] This paper can provide suggestion and reference for implementation of wide-load technical transformation for coal-fired power plants.
2018, 5(S1): 25-28.
doi: 10.16516/j.gedi.issn2095-8676.2018.S1.005
Abstract:
[Introduction] Aiming at the lack of automatic control level in the design of desulfurization system for early large thermal power generating units, unable to meet the safety requirements and low control efficiency of the unit under the current environmental protection policy. [Method] Based on the actual situation of the desulfurization system in Zhuhai power plant and years of operating experience, the paper explored how to set SCS and MCS regulation modes of desulfurization system reasonably, so as to improve the automation level of the desulfurization system, improved the safety and reliability of the system, reduced work intensity of staff, purpose of improving system and personnel efficiency. [Result] The results show that through the field situation in-depth analysis, make the control logic of the actual situation on site, the automatic control level of desulfurization system can be greatly improved, improve the safety stability and operating efficiency of the unit. [Conclusion] For the early large-scale thermal power unit desulfurization automation work is effective, it can provide reference experience for similar projects.
[Introduction] Aiming at the lack of automatic control level in the design of desulfurization system for early large thermal power generating units, unable to meet the safety requirements and low control efficiency of the unit under the current environmental protection policy. [Method] Based on the actual situation of the desulfurization system in Zhuhai power plant and years of operating experience, the paper explored how to set SCS and MCS regulation modes of desulfurization system reasonably, so as to improve the automation level of the desulfurization system, improved the safety and reliability of the system, reduced work intensity of staff, purpose of improving system and personnel efficiency. [Result] The results show that through the field situation in-depth analysis, make the control logic of the actual situation on site, the automatic control level of desulfurization system can be greatly improved, improve the safety stability and operating efficiency of the unit. [Conclusion] For the early large-scale thermal power unit desulfurization automation work is effective, it can provide reference experience for similar projects.
2018, 5(S1): 29-36.
doi: 10.16516/j.gedi.issn2095-8676.2018.S1.006
Abstract:
[Introduction] Aimming to satisfy the state's "ultra-clean" emission requirements for the emission of flue gas pollutants from thermal power plants. [Method] With the research on the technology of dust removal and desulphurization in a thermal power plant in Guangdong, an integration ultra-clean technology of high-efficiency desulphurization and ultra-clean dust elimination has been put forward and applied successfully. Based on the conventional scheme on dust removal and desulphurization, the integration of high-efficiency desulphurization and ultra-clean dust elimination technology was researched and optimized, and the equipment of MGGH and electrostatic dust and mist eliminator was added. The dust and sulfur dioxide was removaled synergistically, and the temperature of flue gas outlet of the chimney was improved, and the concentration of liquid drop and dust was reduced. [Result] The results shows that the concentration of dust and sulfur dioxide is only 2.2 mg/Nm3和16.7 mg/Nm3.It means satisfy and is better than the requirement of "ultra-clean",and the gypsum rain is eliminated. [Conclusion] With this technology, it is possible to satisfy the "ultra-clean" emission requirements without WESP, and it is a guidance for the newly-build and reformed project.
[Introduction] Aimming to satisfy the state's "ultra-clean" emission requirements for the emission of flue gas pollutants from thermal power plants. [Method] With the research on the technology of dust removal and desulphurization in a thermal power plant in Guangdong, an integration ultra-clean technology of high-efficiency desulphurization and ultra-clean dust elimination has been put forward and applied successfully. Based on the conventional scheme on dust removal and desulphurization, the integration of high-efficiency desulphurization and ultra-clean dust elimination technology was researched and optimized, and the equipment of MGGH and electrostatic dust and mist eliminator was added. The dust and sulfur dioxide was removaled synergistically, and the temperature of flue gas outlet of the chimney was improved, and the concentration of liquid drop and dust was reduced. [Result] The results shows that the concentration of dust and sulfur dioxide is only 2.2 mg/Nm3和16.7 mg/Nm3.It means satisfy and is better than the requirement of "ultra-clean",and the gypsum rain is eliminated. [Conclusion] With this technology, it is possible to satisfy the "ultra-clean" emission requirements without WESP, and it is a guidance for the newly-build and reformed project.
2018, 5(S1): 37-41.
doi: 10.16516/j.gedi.issn2095-8676.2018.S1.007
Abstract:
[Introduction] With the development and construction of national urbanization, the location of distributed energy stations is inevitably incorporated into the urban area. The design of deindustrialization is conducive to enhance the image of energy stations and reduce the negative impact on the city, it has become an organic part of the city. [Method] In this paper, Jiangmen project, for example, from the human nature, regional, corporate culture, process design and other aspects of the design approach deindustrialization and the main content, and finally summed up the deindustrialization design should achieved the desired results. [Result] The Jiangmen project, which combines enterprise culture and regional culture, is approved by the owner and local planning department according to local conditions. [Conclusion] In the design of distributed energy station, architecture specialty satisfies the layout requirements of technology specialty, combines equipment volume, enterprise culture and regional culture, gives full play to architect's design method of plane and space composition, packages industrial buildings, and makes them an organic part of the city.
[Introduction] With the development and construction of national urbanization, the location of distributed energy stations is inevitably incorporated into the urban area. The design of deindustrialization is conducive to enhance the image of energy stations and reduce the negative impact on the city, it has become an organic part of the city. [Method] In this paper, Jiangmen project, for example, from the human nature, regional, corporate culture, process design and other aspects of the design approach deindustrialization and the main content, and finally summed up the deindustrialization design should achieved the desired results. [Result] The Jiangmen project, which combines enterprise culture and regional culture, is approved by the owner and local planning department according to local conditions. [Conclusion] In the design of distributed energy station, architecture specialty satisfies the layout requirements of technology specialty, combines equipment volume, enterprise culture and regional culture, gives full play to architect's design method of plane and space composition, packages industrial buildings, and makes them an organic part of the city.
2018, 5(S1): 42-45.
doi: 10.16516/j.gedi.issn2095-8676.2018.S1.008
Abstract:
[Introduction] In order to improve the transmission capacity of power plants, the series capacitor compensation technology is adopted to reduce transmission line impedance. [Method] This paper introduced Dafang-Qianxi Power Plant transmission project generally, analyzed the impact of power unit subsynchronous resonance, overvoltage and short circuit current by adopting series capacitor compensation technology. Furthermore, studied the economic comparison of different series capacitor compensation scheme. [Result] The result shows that the series capacitor compensation scheme with intermediate switching station plus 50% series capacitor compensation is a feasible scheme. [Conclusion] The final conclusions of the paper can be used as guidance to design the series capacitor compensation transmission scheme for Dafang-Qianxi Power Plant.
[Introduction] In order to improve the transmission capacity of power plants, the series capacitor compensation technology is adopted to reduce transmission line impedance. [Method] This paper introduced Dafang-Qianxi Power Plant transmission project generally, analyzed the impact of power unit subsynchronous resonance, overvoltage and short circuit current by adopting series capacitor compensation technology. Furthermore, studied the economic comparison of different series capacitor compensation scheme. [Result] The result shows that the series capacitor compensation scheme with intermediate switching station plus 50% series capacitor compensation is a feasible scheme. [Conclusion] The final conclusions of the paper can be used as guidance to design the series capacitor compensation transmission scheme for Dafang-Qianxi Power Plant.
2018, 5(S1): 46-51.
doi: 10.16516/j.gedi.issn2095-8676.2018.S1.009
Abstract:
[Introduction] With the rapid development of social economy, the underground substation gradually applied in the city 110 kV and above power grid construction, the selection of the transformer which is central to the underground substation. [Method] In this paper, the characteristics and application of vegetable oil insulated transformer and SF6 gas insulated transformer were introduced in detail. The advantages and disadvantages of mineral oil insulated transformer, vegetable oil insulated transformer and SF6 gas transformer were analyzed. [Result] The results show that SF6 gas transformer has small land area, good fire resistance, and is suitable for the selection of main transformer of 110 kV underground substation. [Conclusion] A good design idea for the selection of transformer in underground substation applications is provided as well.
[Introduction] With the rapid development of social economy, the underground substation gradually applied in the city 110 kV and above power grid construction, the selection of the transformer which is central to the underground substation. [Method] In this paper, the characteristics and application of vegetable oil insulated transformer and SF6 gas insulated transformer were introduced in detail. The advantages and disadvantages of mineral oil insulated transformer, vegetable oil insulated transformer and SF6 gas transformer were analyzed. [Result] The results show that SF6 gas transformer has small land area, good fire resistance, and is suitable for the selection of main transformer of 110 kV underground substation. [Conclusion] A good design idea for the selection of transformer in underground substation applications is provided as well.
2018, 5(S1): 52-57.
doi: 10.16516/j.gedi.issn2095-8676.2018.S1.010
Abstract:
[Introduction] The paper aims to design the AC/DC integration scheme of offshore wind farm. [Method] Firstly,this paper analyzed the problems of standby time selection, reliability of communication power supply, reliability of inverter power supply and DC/DC power trip problem. Then according to the code requirement, the paper calculated and deployed the AC/DC integration scheme on the basis of a specific offshore wind farm project. [Result] Finally,this paper elaborates the design of AC/DC integration scheme of offshore wind farm booster station and land control center. [Conclusion] In conclusion, we can see that the offshore wind farm AC-DC integrated power supply design program can simplify the structure of the power supply equipment, save the installation space and investment cost, improve the reliability, availability and maintainability of the station power, and has a certain degree of engineering application value.
[Introduction] The paper aims to design the AC/DC integration scheme of offshore wind farm. [Method] Firstly,this paper analyzed the problems of standby time selection, reliability of communication power supply, reliability of inverter power supply and DC/DC power trip problem. Then according to the code requirement, the paper calculated and deployed the AC/DC integration scheme on the basis of a specific offshore wind farm project. [Result] Finally,this paper elaborates the design of AC/DC integration scheme of offshore wind farm booster station and land control center. [Conclusion] In conclusion, we can see that the offshore wind farm AC-DC integrated power supply design program can simplify the structure of the power supply equipment, save the installation space and investment cost, improve the reliability, availability and maintainability of the station power, and has a certain degree of engineering application value.
2018, 5(S1): 58-64.
doi: 10.16516/j.gedi.issn2095-8676.2018.S1.011
Abstract:
[Introduction] When a transformer is in light load or no-load, the excitation characteristic of the transformer and other comprehensive reasons usually produce large inrush current and cause trip accident. Excessive inrush current may cause damage to transformer internal winding and short service life. Common suppression inrush current technology in the application of three-phase interconnected circuit breaker has certain limitations, therefore, it is urgent to solve this problem in engineering applications. [Method] This article applied a specialized device which is based on the theory that the magnetic biasing opposites the remanence. After updating a three-phase interconnected circuit breaker's control circuit, this article carried on a no-load test. [Result] The result demonstrates that this technology can suppress inrush current in the control of three-phase interconnected circuit breaker, and the suppression effect is good. [Conclusion] This technology is stable and effective and can be promoted in practical projects.
[Introduction] When a transformer is in light load or no-load, the excitation characteristic of the transformer and other comprehensive reasons usually produce large inrush current and cause trip accident. Excessive inrush current may cause damage to transformer internal winding and short service life. Common suppression inrush current technology in the application of three-phase interconnected circuit breaker has certain limitations, therefore, it is urgent to solve this problem in engineering applications. [Method] This article applied a specialized device which is based on the theory that the magnetic biasing opposites the remanence. After updating a three-phase interconnected circuit breaker's control circuit, this article carried on a no-load test. [Result] The result demonstrates that this technology can suppress inrush current in the control of three-phase interconnected circuit breaker, and the suppression effect is good. [Conclusion] This technology is stable and effective and can be promoted in practical projects.
2018, 5(S1): 65-70.
doi: 10.16516/j.gedi.issn2095-8676.2018.S1.012
Abstract:
[Introduction] The induction voltage and induction current of the four circuit of the same tower are greatly influenced by mutual operation mode. [Method] According to an example of practical project, the influence of different operation modes such as shutdown combination and transmission power flow on the induced voltage and induced current was analyzed. [Result] The results show that the electromagnetic induction current of the circuit under test increases with the increase of power flow on other transmission lines, and different outage modes affect the magnitude of electrostatic induction voltage and electromagnetic induction current by changing the space distance and electromagnetic coupling between the operation loop and the detected loop. [Conclusion] When the grounding switches of substations failed to meet the requirements to control the induction voltage and induction current, a strategy of adjusting the operation mode to cooperate with the line overhaul and put into operation is introduced.
[Introduction] The induction voltage and induction current of the four circuit of the same tower are greatly influenced by mutual operation mode. [Method] According to an example of practical project, the influence of different operation modes such as shutdown combination and transmission power flow on the induced voltage and induced current was analyzed. [Result] The results show that the electromagnetic induction current of the circuit under test increases with the increase of power flow on other transmission lines, and different outage modes affect the magnitude of electrostatic induction voltage and electromagnetic induction current by changing the space distance and electromagnetic coupling between the operation loop and the detected loop. [Conclusion] When the grounding switches of substations failed to meet the requirements to control the induction voltage and induction current, a strategy of adjusting the operation mode to cooperate with the line overhaul and put into operation is introduced.
2018, 5(S1): 71-76.
doi: 10.16516/j.gedi.issn2095-8676.2018.S1.013
Abstract:
[Introduction] The current releasing density is one of the key parameters for the performance of DC vertical earthing electrode. [Method] Based on the structure characteristics of vertical DC earthing electrode, study of the influence of sub-electrodes number, sub-electrodes length, sub-electrodes gap distance and electrode well section on the current releasing density and its evenness were carried out. [Result] The study shows that the current releasing density is related to the total length of sub-electrodes, and it is not related to the number of sub-electrodes and the gap distance between them. However, the unevenness of current releasing density is related to the gap distance and the electrode well section. [Conclusion] Optimized vertical electrode structure is presented according to the study results.
[Introduction] The current releasing density is one of the key parameters for the performance of DC vertical earthing electrode. [Method] Based on the structure characteristics of vertical DC earthing electrode, study of the influence of sub-electrodes number, sub-electrodes length, sub-electrodes gap distance and electrode well section on the current releasing density and its evenness were carried out. [Result] The study shows that the current releasing density is related to the total length of sub-electrodes, and it is not related to the number of sub-electrodes and the gap distance between them. However, the unevenness of current releasing density is related to the gap distance and the electrode well section. [Conclusion] Optimized vertical electrode structure is presented according to the study results.
2018, 5(S1): 77-81.
doi: 10.16516/j.gedi.issn2095-8676.2018.S1.014
Abstract:
[Introduction] Converter transformer is the most critical equipment that restricts the construction progress of the whole converter station project. The insulation resistance test of converter transformer is often unqualified in the field transfer test, which has a great impact on the construction progress of the project. If not qualified, it may bury the hidden trouble of safe operation in the future operation. [Method] The causes of nonconformity of insulation resistance test of 4 high-end converter transformers in an UHVDC project were analyzed in detail, various factors causing nonconformity of indexes are investigated, a comprehensive treatment scheme was developed and practical verification was carried out. [Result] The results show that according to different conditions, the method of reducing the dielectric loss of insulating oil or heating with low frequency load short circuit current or replacing insulation oil as a whole can be used to deal with the insulation resistance problem. [Conclusion] This paper can provide some ideas and methods for other similar engineering problems, which can ensure the quality and minimize the influence on the progress of the project.
[Introduction] Converter transformer is the most critical equipment that restricts the construction progress of the whole converter station project. The insulation resistance test of converter transformer is often unqualified in the field transfer test, which has a great impact on the construction progress of the project. If not qualified, it may bury the hidden trouble of safe operation in the future operation. [Method] The causes of nonconformity of insulation resistance test of 4 high-end converter transformers in an UHVDC project were analyzed in detail, various factors causing nonconformity of indexes are investigated, a comprehensive treatment scheme was developed and practical verification was carried out. [Result] The results show that according to different conditions, the method of reducing the dielectric loss of insulating oil or heating with low frequency load short circuit current or replacing insulation oil as a whole can be used to deal with the insulation resistance problem. [Conclusion] This paper can provide some ideas and methods for other similar engineering problems, which can ensure the quality and minimize the influence on the progress of the project.
2018, 5(S1): 82-88.
doi: 10.16516/j.gedi.issn2095-8676.2018.S1.015
Abstract:
[Introduction] As far as Yunnan Funing converter station (±500 kV), it is necessary to optimize the general electric arrangement to reduce the land occupation and save project investment because of the complicated requirements of the system, the large number of circuits and the rough site terrain and so on. [Method] To start with the adaptability of the external conditions such as the system conditions, line conditions and terrain conditions which affect and restrict the general electric arrangement, the available area coverage of the general electric plane and the reasonable distribution map of the distribution devices were discussed. Afterwards, based on the analysis of the typical distribution of the distribution units in the station, the typical layout of each regions was presented, meanwhile four proposals were concluded. [Result] In the end, it is recommended one proposal which requires less land, less investment, faster construction and more convenient operation after the comprehensive technical and economic comparison. [Conclusion] Based on the system conditions, line conditions, site terrain conditions, and comprehensive consideration of the construction, investment and operation and maintenance, the optimization ideas in this article is able to provide a useful reference for follow-up projects.
[Introduction] As far as Yunnan Funing converter station (±500 kV), it is necessary to optimize the general electric arrangement to reduce the land occupation and save project investment because of the complicated requirements of the system, the large number of circuits and the rough site terrain and so on. [Method] To start with the adaptability of the external conditions such as the system conditions, line conditions and terrain conditions which affect and restrict the general electric arrangement, the available area coverage of the general electric plane and the reasonable distribution map of the distribution devices were discussed. Afterwards, based on the analysis of the typical distribution of the distribution units in the station, the typical layout of each regions was presented, meanwhile four proposals were concluded. [Result] In the end, it is recommended one proposal which requires less land, less investment, faster construction and more convenient operation after the comprehensive technical and economic comparison. [Conclusion] Based on the system conditions, line conditions, site terrain conditions, and comprehensive consideration of the construction, investment and operation and maintenance, the optimization ideas in this article is able to provide a useful reference for follow-up projects.
Analysis on the Influence of Switch Position Abnormity to Bus Protection and Its Solution Discussion
2018, 5(S1): 89-94.
doi: 10.16516/j.gedi.issn2095-8676.2018.S1.016
Abstract:
[Introduction] During the double bus operation in substation, the conduction status of main and auxiliary switch contact are inconsistent, due to the main contact arc and the inconsistency of main and auxiliary contact stroke, which is named switch position abnormity. The bus protection can not judge the operation mode of bus bar and make incorrect action finally. [Method] In this paper, four kinds of position abnormity of switch and its influence to bus protection were summaried. [Result] The results show that a new auxiliary contact which is consistent to the arc status of main contact is putted forward preliminary. [Conclusion] This work provides some guidance for improving the selectivity of bus protection.
[Introduction] During the double bus operation in substation, the conduction status of main and auxiliary switch contact are inconsistent, due to the main contact arc and the inconsistency of main and auxiliary contact stroke, which is named switch position abnormity. The bus protection can not judge the operation mode of bus bar and make incorrect action finally. [Method] In this paper, four kinds of position abnormity of switch and its influence to bus protection were summaried. [Result] The results show that a new auxiliary contact which is consistent to the arc status of main contact is putted forward preliminary. [Conclusion] This work provides some guidance for improving the selectivity of bus protection.
2018, 5(S1): 95-99.
doi: 10.16516/j.gedi.issn2095-8676.2018.S1.017
Abstract:
[Introduction] The discrepancy between design drawings and construction layouts has become one of the principle problems during the construction of convertor station. [Method] In this paper, a Three-Stage Management Mode for discrepancy elimination was discussed, which was implemented in newly built convertor stations of China Southern Power Grid. In this Mode, staged discrepancy eliminating solutions focusing respectively on preliminary design, detailed design and construction were provided. [Result] It helps to clarify the responsibilities and obligations of parties involved in the project, reduce the number of the discrepancies. [Conclusion] This mode can avoid waste of manpower and other resources for rectification of those discrepancies, and thus improve the efficiency of project management and proceed the project into commercial operation smoothly.
[Introduction] The discrepancy between design drawings and construction layouts has become one of the principle problems during the construction of convertor station. [Method] In this paper, a Three-Stage Management Mode for discrepancy elimination was discussed, which was implemented in newly built convertor stations of China Southern Power Grid. In this Mode, staged discrepancy eliminating solutions focusing respectively on preliminary design, detailed design and construction were provided. [Result] It helps to clarify the responsibilities and obligations of parties involved in the project, reduce the number of the discrepancies. [Conclusion] This mode can avoid waste of manpower and other resources for rectification of those discrepancies, and thus improve the efficiency of project management and proceed the project into commercial operation smoothly.
2018, 5(S1): 100-105.
doi: 10.16516/j.gedi.issn2095-8676.2018.S1.018
Abstract:
[Introduction] In order to further improve the quality and efficiency of distribution network operation and maintenance, support the transformation of distribution network technology to digitalization, lean and intelligent transformation. [Method] On the basis of a large number of distribution substation problems analysis and Latest monitoring technology research, this paper put forward the architecture of smart distribution system, and the design scheme of the system platform and hardware facilities, and focusing on the functional modules of environment, security, video and equipment status, the key technical routes of smart distribution substation were emphatically analyzed. This work provided some guidance for further study on building intelligent, visualized, automated and interactive modern smart distribution substation. [Result] A new type of modern distribution substation with intellectualization, visualization, automation and interaction has been established. and establishes a new type of modern distribution substation with intellectualization, visualization, automation and interaction. [Conclusion] The results of this paper are applied in a large number of smart distribution substation construction, which provides a very important guiding role for the standardized construction of smart distribution substation in China.
[Introduction] In order to further improve the quality and efficiency of distribution network operation and maintenance, support the transformation of distribution network technology to digitalization, lean and intelligent transformation. [Method] On the basis of a large number of distribution substation problems analysis and Latest monitoring technology research, this paper put forward the architecture of smart distribution system, and the design scheme of the system platform and hardware facilities, and focusing on the functional modules of environment, security, video and equipment status, the key technical routes of smart distribution substation were emphatically analyzed. This work provided some guidance for further study on building intelligent, visualized, automated and interactive modern smart distribution substation. [Result] A new type of modern distribution substation with intellectualization, visualization, automation and interaction has been established. and establishes a new type of modern distribution substation with intellectualization, visualization, automation and interaction. [Conclusion] The results of this paper are applied in a large number of smart distribution substation construction, which provides a very important guiding role for the standardized construction of smart distribution substation in China.
2018, 5(S1): 106-112.
doi: 10.16516/j.gedi.issn2095-8676.2018.S1.019
Abstract:
[Introduction] In order to solve the distribution structure of IDC in special situations, a new design has been proposed. Now the IDC distribution power grid design is already quite mature, which is in the stage of standard design. A variety of typical designs and standard designs have been published, so most of the situation in low voltage distribution design can be satisfied, the traditional design doesn't have too much innovation. However, the standard design does not cover some special scenes, such as the problem of limited power supply caused by the investment problem. [Method] Based on a specific project, this paper redesigned power grid structure with the concept of resource pool under the background of limited power supply. [Result] According to the special situation of this paper, we design a new IDC distribution structure and optimize the long-term transformation plan. [Conclusion] The new structure can satisfy the special situation such as the limited power supply, and which has very high economy and security. The new structure can provide reference for other similar projects.
[Introduction] In order to solve the distribution structure of IDC in special situations, a new design has been proposed. Now the IDC distribution power grid design is already quite mature, which is in the stage of standard design. A variety of typical designs and standard designs have been published, so most of the situation in low voltage distribution design can be satisfied, the traditional design doesn't have too much innovation. However, the standard design does not cover some special scenes, such as the problem of limited power supply caused by the investment problem. [Method] Based on a specific project, this paper redesigned power grid structure with the concept of resource pool under the background of limited power supply. [Result] According to the special situation of this paper, we design a new IDC distribution structure and optimize the long-term transformation plan. [Conclusion] The new structure can satisfy the special situation such as the limited power supply, and which has very high economy and security. The new structure can provide reference for other similar projects.
2018, 5(S1): 113-116.
doi: 10.16516/j.gedi.issn2095-8676.2018.S1.020
Abstract:
[Introduction] There are a lot of problems such as sediment deposition in mountainous rivers to endanger the safety of water intake. We must adopt safe and effective water extraction installations to ensure the safe operation of power plants. Although existing water abstraction technology has reduced the harm to a certain extent, various problems still exist. [Method] This article analyzed some of the problems that existing in water extraction installations, through the optimization of layout, reducing the pump floor elevation, combining the pier and structures and flushing sluice lifting equipment through the pump room indoor and other measures to eliminate the problem of existing water extraction installations. [Result] A new water extraction installations is put forward, that can effcetively increase the pump suction depth, optimize flow pattern, facilitate equipment maintenance to further improve the safety of water intake to ensure the safe operation of power plants. [Conclusion] This water extraction installations can be used in the mountainous river intake project to bring good economic benefit.
[Introduction] There are a lot of problems such as sediment deposition in mountainous rivers to endanger the safety of water intake. We must adopt safe and effective water extraction installations to ensure the safe operation of power plants. Although existing water abstraction technology has reduced the harm to a certain extent, various problems still exist. [Method] This article analyzed some of the problems that existing in water extraction installations, through the optimization of layout, reducing the pump floor elevation, combining the pier and structures and flushing sluice lifting equipment through the pump room indoor and other measures to eliminate the problem of existing water extraction installations. [Result] A new water extraction installations is put forward, that can effcetively increase the pump suction depth, optimize flow pattern, facilitate equipment maintenance to further improve the safety of water intake to ensure the safe operation of power plants. [Conclusion] This water extraction installations can be used in the mountainous river intake project to bring good economic benefit.
2018, 5(S1): 117-122.
doi: 10.16516/j.gedi.issn2095-8676.2018.S1.021
Abstract:
[Introduction] The site laboratory in nuclear power plant is the important technology building,and the auxiliary process system served is also important to provide the better process system design. [Method] This article took the site laboratory in Hongyanhe nuclear power plant as an example,and discussed the auxiliary process system. [Result] The results summarize the layout principles of radiation zoning according to the characters and source of the sample, and the system which for being slightly radioactive-sewage recovery and the design principles of piping layout and so on. [Conclusion] This article provides the useful experience for the process system design of site laboratory in nuclear power plant in the future.
[Introduction] The site laboratory in nuclear power plant is the important technology building,and the auxiliary process system served is also important to provide the better process system design. [Method] This article took the site laboratory in Hongyanhe nuclear power plant as an example,and discussed the auxiliary process system. [Result] The results summarize the layout principles of radiation zoning according to the characters and source of the sample, and the system which for being slightly radioactive-sewage recovery and the design principles of piping layout and so on. [Conclusion] This article provides the useful experience for the process system design of site laboratory in nuclear power plant in the future.
2018, 5(S1): 123-128.
doi: 10.16516/j.gedi.issn2095-8676.2018.S1.022
Abstract:
[Introduction] The important part for offshore wind power development is the construction of a suitable offshore booster substation.In recent years, the main form of the foundation for offshore wind station is jacket structure. [Method] In this paper, the physical model tests were carried out to study the local scour of the base wave flow for the jacket foundationwith different scale in combination with a wind farm project to be built on the sandy coast.On this basis, the influence of wave and water flow on local scour depth were analyzed, and the scope and depth of local scour of pile foundation under the combined action of wave flow were studied. Finally, the protective effect of sand cover and sandbag was studied. [Result] The results show that the most depth of scouring for the jacket foundation of the booster station is at the water face of the foundation, and the maximum depth is 1.75 times of the diameter of the pile foundation. [Conclusion] The research methods and related conclusions in this paper can provide references for similar engineering scour test and engineering design.
[Introduction] The important part for offshore wind power development is the construction of a suitable offshore booster substation.In recent years, the main form of the foundation for offshore wind station is jacket structure. [Method] In this paper, the physical model tests were carried out to study the local scour of the base wave flow for the jacket foundationwith different scale in combination with a wind farm project to be built on the sandy coast.On this basis, the influence of wave and water flow on local scour depth were analyzed, and the scope and depth of local scour of pile foundation under the combined action of wave flow were studied. Finally, the protective effect of sand cover and sandbag was studied. [Result] The results show that the most depth of scouring for the jacket foundation of the booster station is at the water face of the foundation, and the maximum depth is 1.75 times of the diameter of the pile foundation. [Conclusion] The research methods and related conclusions in this paper can provide references for similar engineering scour test and engineering design.
2018, 5(S1): 129-132.
doi: 10.16516/j.gedi.issn2095-8676.2018.S1.023
Abstract:
[Introduction] The problem of cavitation and reduction of output of water ring vacuum pump that existing in the operation of the pumps in power plant has been the prime focus of project owners. [Method] The working principle of vacuum pump was analyzed, the reason of the problem mentioned above was presented and the scheme solving this problem was proposed. [Result] Results show that the optimized design scheme has the advantages of increasing the output and reducing the energy consumed of vacuum pump, improving the operation security of vacuum pump and economic efficiency of power plant. [Conclusion] Thus,this work provides some guidance for the design of the cooling water system for working liquid of water ring vacuum pump in various types of power plant.
[Introduction] The problem of cavitation and reduction of output of water ring vacuum pump that existing in the operation of the pumps in power plant has been the prime focus of project owners. [Method] The working principle of vacuum pump was analyzed, the reason of the problem mentioned above was presented and the scheme solving this problem was proposed. [Result] Results show that the optimized design scheme has the advantages of increasing the output and reducing the energy consumed of vacuum pump, improving the operation security of vacuum pump and economic efficiency of power plant. [Conclusion] Thus,this work provides some guidance for the design of the cooling water system for working liquid of water ring vacuum pump in various types of power plant.
2018, 5(S1): 133-139.
doi: 10.16516/j.gedi.issn2095-8676.2018.S1.024
Abstract:
[Introduction] This paper aims to explore the applicability of simplified dynamic calculation for equipment foundations on the ground of plant. [Method] Taking a typical equipment on the main building ground of a typical coal-fired power plant as an example, this paper compared the computational results of the whole frequency domain dynamic analysis and the simplified dynamic analysis and specified the specific requirements of aspect ratio for equipment foundation to use the simplified dynamic calculation. [Result] The results we obtained demonstrate that only when the equipment foundation aspect ratio is not less than 1.5, using the simplified dynamic calculation method can get more accurate results. [Conclusion] Based on the analysis of the calculation results, it can be seen that the simplified power calculation method provided by the specification is applicable to the power equipment, which is generally located in the main plant at zero meters, when the base weight is more than 5 times the machine weight and the base width and height ratio is not less than 1.5.
[Introduction] This paper aims to explore the applicability of simplified dynamic calculation for equipment foundations on the ground of plant. [Method] Taking a typical equipment on the main building ground of a typical coal-fired power plant as an example, this paper compared the computational results of the whole frequency domain dynamic analysis and the simplified dynamic analysis and specified the specific requirements of aspect ratio for equipment foundation to use the simplified dynamic calculation. [Result] The results we obtained demonstrate that only when the equipment foundation aspect ratio is not less than 1.5, using the simplified dynamic calculation method can get more accurate results. [Conclusion] Based on the analysis of the calculation results, it can be seen that the simplified power calculation method provided by the specification is applicable to the power equipment, which is generally located in the main plant at zero meters, when the base weight is more than 5 times the machine weight and the base width and height ratio is not less than 1.5.
2018, 5(S1): 140-145.
doi: 10.16516/j.gedi.issn2095-8676.2018.S1.025
Abstract:
[Introduction] In order to investigate the mechanism of dynamic elastic time response of structures in high intensity regions, an elastic dynamic time-history analysis is carried out for a central control building of a gas turbine generator plant. [Method] In this paper, three seismic waves were selected according to the current wave selection principle, and the elastodynamic time history analysis of the structure was carried out. [Result] The structural response result in the elastic dynamic time-history analysis is shown, which is compared with the structural response of the CQC mode decomposition response spectrum method. [Conclusion] Furthermore, according to the analysis result, the mechanism of structural dynamic response under high intensity region is investigated, the rationality and applicability of the elastic dynamic time history analysis are discussed, which provides reference for structural design and analysis of this kind of structure.
[Introduction] In order to investigate the mechanism of dynamic elastic time response of structures in high intensity regions, an elastic dynamic time-history analysis is carried out for a central control building of a gas turbine generator plant. [Method] In this paper, three seismic waves were selected according to the current wave selection principle, and the elastodynamic time history analysis of the structure was carried out. [Result] The structural response result in the elastic dynamic time-history analysis is shown, which is compared with the structural response of the CQC mode decomposition response spectrum method. [Conclusion] Furthermore, according to the analysis result, the mechanism of structural dynamic response under high intensity region is investigated, the rationality and applicability of the elastic dynamic time history analysis are discussed, which provides reference for structural design and analysis of this kind of structure.
2018, 5(S1): 146-149.
doi: 10.16516/j.gedi.issn2095-8676.2018.S1.026
Abstract:
[Introduction] The structural design of desulfurization anti-corrosion flue gas duct in wet FGD is always a difficult point. [Method] Technical code for design of thermal power plant air & flue gas ducts/raw coal & pulverized coal piping(DL/T 5121-2000) and the auxiliary calculation method,which is used to guide the design of thermal power plant air & flue gas ducts, make no distinction between desulfurization anti-corrosion flue gas duct and usual flue gas duct design, and for larger stiffener, combined stiffener cross section parameters of ([8~［22a) and (I10~I28a) were only listed in the code, it limited the usage specifications of stiffener. [Result] Combining the engineering fact, this paper revises the rigidity calculation formula of stiffener space according to the plate allow deformation of desulfurization anti-corrosion flue gas duct. [Conclusion] The design detail of cross & triangle inner brace is proposed to reduce the difficulty of anti-corrosive construction. This paper also gives a simple method to expand combined stiffener cross section parameter, thus to provide some reference for the design of desulfurization anti-corrosion flue gas duct.
[Introduction] The structural design of desulfurization anti-corrosion flue gas duct in wet FGD is always a difficult point. [Method] Technical code for design of thermal power plant air & flue gas ducts/raw coal & pulverized coal piping(DL/T 5121-2000) and the auxiliary calculation method,which is used to guide the design of thermal power plant air & flue gas ducts, make no distinction between desulfurization anti-corrosion flue gas duct and usual flue gas duct design, and for larger stiffener, combined stiffener cross section parameters of ([8~［22a) and (I10~I28a) were only listed in the code, it limited the usage specifications of stiffener. [Result] Combining the engineering fact, this paper revises the rigidity calculation formula of stiffener space according to the plate allow deformation of desulfurization anti-corrosion flue gas duct. [Conclusion] The design detail of cross & triangle inner brace is proposed to reduce the difficulty of anti-corrosive construction. This paper also gives a simple method to expand combined stiffener cross section parameter, thus to provide some reference for the design of desulfurization anti-corrosion flue gas duct.
2018, 5(S1): 150-156.
doi: 10.16516/j.gedi.issn2095-8676.2018.S1.027
Abstract:
[Introduction] The assumption of rigid floor slab is a simplified analysis method which is widely used in civil building structure and has strong applicability. In general, the interlayer and opening of the civil structure are less, but the interlayer and opening of the power plant structure are generally more. This paper aims to study the influence of rigid floor assumption on calculation results with large openings. [Method] In this paper, a large general finite element software MIDAS was used to establish a hypothetical ideal opening structure model, typical slab large open hole civil architecture model, and a large nuclear power plant conventional island workshop structure model. [Result] The results show that the assumption of rigid floor would cause a certain degree of distortion to the calculation results of such structures. [Conclusion] Therefore, it is necessary to pay attention to the effect of the large opening structure, especially in the analysis and application of the power plant structure, and not to use the rigid floor assumption as long as possible.
[Introduction] The assumption of rigid floor slab is a simplified analysis method which is widely used in civil building structure and has strong applicability. In general, the interlayer and opening of the civil structure are less, but the interlayer and opening of the power plant structure are generally more. This paper aims to study the influence of rigid floor assumption on calculation results with large openings. [Method] In this paper, a large general finite element software MIDAS was used to establish a hypothetical ideal opening structure model, typical slab large open hole civil architecture model, and a large nuclear power plant conventional island workshop structure model. [Result] The results show that the assumption of rigid floor would cause a certain degree of distortion to the calculation results of such structures. [Conclusion] Therefore, it is necessary to pay attention to the effect of the large opening structure, especially in the analysis and application of the power plant structure, and not to use the rigid floor assumption as long as possible.
2018, 5(S1): 157-160.
doi: 10.16516/j.gedi.issn2095-8676.2018.S1.028
Abstract:
[Introduction] In order to solve the problem of insufficient space for steel pipe foundation in urban areas, some optimization methods of steel tube pipe foundation design in space-limited areas are put forward in this paper, which are based on an engineering example. [Method] Based on the analysis of the mechanical properties of steel pipe foundation and the analysis of the actual situation on the site, some optimization design methods were proposed to solve the problem of insufficient space for steel pipe foundation. [Result] The actual engineering application results show that this optimization design method has a good effect. [Conclusion] This paper provides some references for the foundation design of space-limited areas.
[Introduction] In order to solve the problem of insufficient space for steel pipe foundation in urban areas, some optimization methods of steel tube pipe foundation design in space-limited areas are put forward in this paper, which are based on an engineering example. [Method] Based on the analysis of the mechanical properties of steel pipe foundation and the analysis of the actual situation on the site, some optimization design methods were proposed to solve the problem of insufficient space for steel pipe foundation. [Result] The actual engineering application results show that this optimization design method has a good effect. [Conclusion] This paper provides some references for the foundation design of space-limited areas.
2018, 5(S1): 161-165.
doi: 10.16516/j.gedi.issn2095-8676.2018.S1.029
Abstract:
[Introduction] The purification station of a power plant in a mountainous area is arranged at the edge of the river, and the source water is disposed on site to be transported to the factory. River on the east side of the original landscape for step slope, valley edge steep terrain, cleaning station station site requires a flat handle, same its northeast, the need for excavation, the southwest side of the station need to fill, you need to set up two vertical intersection of retaining wall. [Method] The design was put forward separately two schemes of gravity retaining wall and buttressed retaining wall, the two schemes were compared from the construction and cost point of view, and it was found that they are difficult to meet the actual site construction needs. Finally,comprehensive two schemes innovatively put forward returnable integral compound type retaining wall, it solved the site problems very well. [Result] After scheme comparison, choose a new angle of retaining wall design, effectively reduced the dosage of basal area and reinforced, local materials, saving cost, finished high backfill slope at the smaller economic costs of retaining wall structure. [Conclusion] The engineering practice proves that this new type of corner retaining wall not only satisfies the actual use function of the site, but also saves the cost of the project and facilitates the construction.
[Introduction] The purification station of a power plant in a mountainous area is arranged at the edge of the river, and the source water is disposed on site to be transported to the factory. River on the east side of the original landscape for step slope, valley edge steep terrain, cleaning station station site requires a flat handle, same its northeast, the need for excavation, the southwest side of the station need to fill, you need to set up two vertical intersection of retaining wall. [Method] The design was put forward separately two schemes of gravity retaining wall and buttressed retaining wall, the two schemes were compared from the construction and cost point of view, and it was found that they are difficult to meet the actual site construction needs. Finally,comprehensive two schemes innovatively put forward returnable integral compound type retaining wall, it solved the site problems very well. [Result] After scheme comparison, choose a new angle of retaining wall design, effectively reduced the dosage of basal area and reinforced, local materials, saving cost, finished high backfill slope at the smaller economic costs of retaining wall structure. [Conclusion] The engineering practice proves that this new type of corner retaining wall not only satisfies the actual use function of the site, but also saves the cost of the project and facilitates the construction.
2018, 5(S1): 166-171.
doi: 10.16516/j.gedi.issn2095-8676.2018.S1.030
Abstract:
[Introduction] Cable terminal tower is the development trend of converting the overhead transmission line to electric cable line in power grid construction. [Method] Based on the current status of cable terminal construction, this paper proposed a new anti-beam structure of cable terminal platform, mainly studied the optimal arrangement of the platform structure and analyzes in detail of the new structure. The strength, rigidity and stability of the main force components of the calibration platform were analyzed. The influence of the platform structure on the force of the tower was analyzed, and the details were discussed. [Result] The results show that using a simplified structure of the anti-beam structure using simplified support structure in a range of span and the terminal head and the arrester base on the main beam, the size and spacing of the secondary beams can be properly arranged to ensure the strength and rigidity of the platform structure and save the amount of steel. Form a standardized platform design, and combine the existing terminal towers with diverse conditions can realize "general-purpose" through the "terminal tower + standard design platform" model. [Conclusion] Our data widely summarizes the experiences in Guangdong province, this work provides some guidance for different areas, voltage classes and tower models.
[Introduction] Cable terminal tower is the development trend of converting the overhead transmission line to electric cable line in power grid construction. [Method] Based on the current status of cable terminal construction, this paper proposed a new anti-beam structure of cable terminal platform, mainly studied the optimal arrangement of the platform structure and analyzes in detail of the new structure. The strength, rigidity and stability of the main force components of the calibration platform were analyzed. The influence of the platform structure on the force of the tower was analyzed, and the details were discussed. [Result] The results show that using a simplified structure of the anti-beam structure using simplified support structure in a range of span and the terminal head and the arrester base on the main beam, the size and spacing of the secondary beams can be properly arranged to ensure the strength and rigidity of the platform structure and save the amount of steel. Form a standardized platform design, and combine the existing terminal towers with diverse conditions can realize "general-purpose" through the "terminal tower + standard design platform" model. [Conclusion] Our data widely summarizes the experiences in Guangdong province, this work provides some guidance for different areas, voltage classes and tower models.
2018, 5(S1): 172-176.
doi: 10.16516/j.gedi.issn2095-8676.2018.S1.031
Abstract:
[Introduction] Topography in mountainous area is complex, the large-scale equipments for transportation are heavy and long, better economy is demanded for the construction of the transportation road, which leads to difficulty in road route design. [Method] Based on a practical engineering, considering the cost proportion of the project investment, the feature of the wind farm equipments and the performance of the transport vehicles, analyzed the basic principles of the road route selection, researched the common and limited minimum horizontal curve radius and the maximum longitudinal grade of the road. [Result] The technical indicator demand of the road route and the constraint of the environment shall be considered in the road design, the grade of longitudinal profile is mainly dominated and the limited index is commonly used. [Conclusion] In use of the special vehicles for the transportation, the common minimum horizontal curve radius of the road is 30.0 m, the limited minimum horizontal curve radius is 20.0 m; and the common maximum slope is 0.14, the limited maximum slope is 0.17, the results can be reference for wind farm transportation road design and construction.
[Introduction] Topography in mountainous area is complex, the large-scale equipments for transportation are heavy and long, better economy is demanded for the construction of the transportation road, which leads to difficulty in road route design. [Method] Based on a practical engineering, considering the cost proportion of the project investment, the feature of the wind farm equipments and the performance of the transport vehicles, analyzed the basic principles of the road route selection, researched the common and limited minimum horizontal curve radius and the maximum longitudinal grade of the road. [Result] The technical indicator demand of the road route and the constraint of the environment shall be considered in the road design, the grade of longitudinal profile is mainly dominated and the limited index is commonly used. [Conclusion] In use of the special vehicles for the transportation, the common minimum horizontal curve radius of the road is 30.0 m, the limited minimum horizontal curve radius is 20.0 m; and the common maximum slope is 0.14, the limited maximum slope is 0.17, the results can be reference for wind farm transportation road design and construction.
2018, 5(S1): 177-182.
doi: 10.16516/j.gedi.issn2095-8676.2018.S1.032
Abstract:
[Introduction] The monitoring system and control strategy of micro-grid has been considered as one of the difficulties to be solved in the micro-grid design process. [Method] Based on project exssperience, the design method of the micro-gird monitoring system and its control strategy were described in the paper. And then, the functional framework, the network structure and the control strategies of monitoring system in the micro-grid were proposed, at the same time, the paper gave the concrete process of PCC switching strategy. [Result] Finally, a project example was given in the paper,the network structure and the control strategies of the example were proposed. [Conclusion] The example shows the effectiveness of the program,it has guiding significance for practical project.
[Introduction] The monitoring system and control strategy of micro-grid has been considered as one of the difficulties to be solved in the micro-grid design process. [Method] Based on project exssperience, the design method of the micro-gird monitoring system and its control strategy were described in the paper. And then, the functional framework, the network structure and the control strategies of monitoring system in the micro-grid were proposed, at the same time, the paper gave the concrete process of PCC switching strategy. [Result] Finally, a project example was given in the paper,the network structure and the control strategies of the example were proposed. [Conclusion] The example shows the effectiveness of the program,it has guiding significance for practical project.
2018, 5(S1): 183-188.
doi: 10.16516/j.gedi.issn2095-8676.2018.S1.033
Abstract:
[Introduction] In order to grasp the condition of data network intuitively and real-time, and improve the efficiency of data network operation and maintenance. [Method] This paper proposed a method of routing detection. By collecting the protocol information such as OSPF and BGP, it could present the exactly the same real time whole network map as the router "see", so that the link fault and the third layer routing abnormality could be detected in time. [Result] Based on the routing detection method, this paper proposed a model of data network monitoring and simulation system, including system architecture and data flow, etc. [Conclusion] The system can assist network management personnel to detect and deal with fault, record historical routing events for analysis, and test network cutting program without affecting the in-use network.
[Introduction] In order to grasp the condition of data network intuitively and real-time, and improve the efficiency of data network operation and maintenance. [Method] This paper proposed a method of routing detection. By collecting the protocol information such as OSPF and BGP, it could present the exactly the same real time whole network map as the router "see", so that the link fault and the third layer routing abnormality could be detected in time. [Result] Based on the routing detection method, this paper proposed a model of data network monitoring and simulation system, including system architecture and data flow, etc. [Conclusion] The system can assist network management personnel to detect and deal with fault, record historical routing events for analysis, and test network cutting program without affecting the in-use network.
2018, 5(S1): 189-193.
doi: 10.16516/j.gedi.issn2095-8676.2018.S1.034
Abstract:
[Introduction] To accelerate the construction of standby power dispatch systems at all levels control centers and improve the disaster recovery level of power dispatching, it is necessary to study the ubiquitous technical difficulties of homogeneous and heterogeneous architecture modes in the construction of the active and standby power dispatch systems in all regions of China. [Method] According to the construction principles of "synchronous operating, seamless handover" and "one-sided maintain and bilateral synchronization", the differences of products and the technical barricade between different manufacturers made significant divergence when it came to comparing homogeneous-architecture construction and heterogeneous-architecture construction. [Result] Basing on long-term work experience and deep understanding of the active and standby power dispatch system, this paper analyzes the main technical difficulties of the two kinds of construction modes, the technical key points have been summarized. With the help of key indicators such as security、reliability、construction complexity、maintenance workload、technical contribution、ROI and assets activity ratio, construction engineering evaluation and analysis of advantages and disadvantages have being given in this paper. [Conclusion] According to the conclusion of the research, some suggestions are put forward, which could provide some guidance for further construction decision concerning the standby power dispatch system in China.
[Introduction] To accelerate the construction of standby power dispatch systems at all levels control centers and improve the disaster recovery level of power dispatching, it is necessary to study the ubiquitous technical difficulties of homogeneous and heterogeneous architecture modes in the construction of the active and standby power dispatch systems in all regions of China. [Method] According to the construction principles of "synchronous operating, seamless handover" and "one-sided maintain and bilateral synchronization", the differences of products and the technical barricade between different manufacturers made significant divergence when it came to comparing homogeneous-architecture construction and heterogeneous-architecture construction. [Result] Basing on long-term work experience and deep understanding of the active and standby power dispatch system, this paper analyzes the main technical difficulties of the two kinds of construction modes, the technical key points have been summarized. With the help of key indicators such as security、reliability、construction complexity、maintenance workload、technical contribution、ROI and assets activity ratio, construction engineering evaluation and analysis of advantages and disadvantages have being given in this paper. [Conclusion] According to the conclusion of the research, some suggestions are put forward, which could provide some guidance for further construction decision concerning the standby power dispatch system in China.
2018, 5(S1): 194-198.
doi: 10.16516/j.gedi.issn2095-8676.2018.S1.035
Abstract:
[Introduction] In order to fully exploit and utilize the offshore water's rich wind energy in Guangdong coastline, promoting green sustainable development, soil investigation of site and foundation in the wind farm should be carried out. But offshore investigation is different from the land, and it's very difficult. [Method] The paper studied offshore wind farm planning along Guangdong coast, technical requirements of investigation and design, offshore site conditions, investigating manners, etc. [Result] Engineering practice has proved that comprehensive investigation manners should be used under the suitable technical codes and guidelines, and geotechnical data are built based on the basis of offshore wind farm projects. [Conclusion] The analysis and discussion are reference to offshore soil investigation.
[Introduction] In order to fully exploit and utilize the offshore water's rich wind energy in Guangdong coastline, promoting green sustainable development, soil investigation of site and foundation in the wind farm should be carried out. But offshore investigation is different from the land, and it's very difficult. [Method] The paper studied offshore wind farm planning along Guangdong coast, technical requirements of investigation and design, offshore site conditions, investigating manners, etc. [Result] Engineering practice has proved that comprehensive investigation manners should be used under the suitable technical codes and guidelines, and geotechnical data are built based on the basis of offshore wind farm projects. [Conclusion] The analysis and discussion are reference to offshore soil investigation.
2018, 5(S1): 199-203.
doi: 10.16516/j.gedi.issn2095-8676.2018.S1.036
Abstract:
[Introduction] In order to study the engineering properties of soft soil widely distributed in the West Bank of the Pearl River Estuary and guide the regional engineering construction. [Method] The physical and mechanical parameters of a construction project in Hengqin New Area of Zhuhai City were analyzed by means of modern mathematical statistics; the engineering characteristics and parameter correlation of the soft soil in the area were studied based on the geotechnical investigation data. [Result] The results show that the soft soil in Hengqin New Area has the typical characteristics of high water content, high porosity ratio, fluid-plastic state, high compressibility, low strength value and under-consolidation, its natural water content decreases with the increase of buried depth, plasticity index increases with the increase of buried depth, and the contact behavior of soft soil becomes better with the increase of depth; The shear strength index obtained by the fast shear test increases with the buried depth, but the shear strength index obtained by the consolidated fast shear test and the triaxial consolidated undrained shear strength (CU) test shows no regularity; The shear strength shows a good regularity, and increases with the buried depth. [Conclusion] Due to the soft soil in this area is deep, and its physical and mechanical properties and engineering properties change regularly with depth. The soft soil properties between 18m and 27m in depth change greatly in horizontal direction. It is suggested that the soil layers should be subdivided according to the engineering design characteristics when it is necessary.
[Introduction] In order to study the engineering properties of soft soil widely distributed in the West Bank of the Pearl River Estuary and guide the regional engineering construction. [Method] The physical and mechanical parameters of a construction project in Hengqin New Area of Zhuhai City were analyzed by means of modern mathematical statistics; the engineering characteristics and parameter correlation of the soft soil in the area were studied based on the geotechnical investigation data. [Result] The results show that the soft soil in Hengqin New Area has the typical characteristics of high water content, high porosity ratio, fluid-plastic state, high compressibility, low strength value and under-consolidation, its natural water content decreases with the increase of buried depth, plasticity index increases with the increase of buried depth, and the contact behavior of soft soil becomes better with the increase of depth; The shear strength index obtained by the fast shear test increases with the buried depth, but the shear strength index obtained by the consolidated fast shear test and the triaxial consolidated undrained shear strength (CU) test shows no regularity; The shear strength shows a good regularity, and increases with the buried depth. [Conclusion] Due to the soft soil in this area is deep, and its physical and mechanical properties and engineering properties change regularly with depth. The soft soil properties between 18m and 27m in depth change greatly in horizontal direction. It is suggested that the soil layers should be subdivided according to the engineering design characteristics when it is necessary.
2018, 5(S1): 204-208.
doi: 10.16516/j.gedi.issn2095-8676.2018.S1.037
Abstract:
[Introduction] The coal-electricity integration mode is a development direction of coal-fired power plant in recent years, some planning power plant built in the coal mined area, the goaf is a big threat to the safety of power plant, and goaf detection is the basis of evaluation and treatment, so the goaf detection is a very important work. [Method] According to the characteristics of the goaf in Guizhou Dafang coal-fired power plant, the comprehensive geophysical exploration technology in coal mine goaf detection, overcome the single geophysical technology shortcomings. according to the electrical and elastic geological differences, using the method of high density resistivity method, transient electromagnetic method and seismic imaging method combining the development of goaf detection. [Result] Through comprehensive interpretation of geophysical technology, this work provide achieved good results, gives the goaf roadway and the spatial distribution and drilling verification, and accumulated experience for the subsequent detection of the integration of coal power plant in the goaf. [Conclusion] The detection of goaf need to choose the geophysical techniques which based on the topography, geological features, and geophysical characteristics of the coal mines, and a variety of methods should be tested to give full play to the advantages of each method, so as to obtain an actual detection result.
[Introduction] The coal-electricity integration mode is a development direction of coal-fired power plant in recent years, some planning power plant built in the coal mined area, the goaf is a big threat to the safety of power plant, and goaf detection is the basis of evaluation and treatment, so the goaf detection is a very important work. [Method] According to the characteristics of the goaf in Guizhou Dafang coal-fired power plant, the comprehensive geophysical exploration technology in coal mine goaf detection, overcome the single geophysical technology shortcomings. according to the electrical and elastic geological differences, using the method of high density resistivity method, transient electromagnetic method and seismic imaging method combining the development of goaf detection. [Result] Through comprehensive interpretation of geophysical technology, this work provide achieved good results, gives the goaf roadway and the spatial distribution and drilling verification, and accumulated experience for the subsequent detection of the integration of coal power plant in the goaf. [Conclusion] The detection of goaf need to choose the geophysical techniques which based on the topography, geological features, and geophysical characteristics of the coal mines, and a variety of methods should be tested to give full play to the advantages of each method, so as to obtain an actual detection result.
2018, 5(S1): 209-214.
doi: 10.16516/j.gedi.issn2095-8676.2018.S1.038
Abstract:
[Introduction] The traditional environmental geophysics method is one of the main solutions of monitoring liquid leakage of hazardous liquids in landfills. However, such methods have the defects of limited monitoring range, low flexibility, long time interval and poor monitoring accuracy. This article aims to establish a new distributed electrical method to monitor the leakage of hazardous liquids to improve the above situation. [Method] This article introduced the new method by starting from the basic principles of distributed electrical system, designation and implementation of the system's software and hardware, which contributed to the research, development and tests of the system. The new distributed electrical method adopted a data acquisition method, which had the features of one-time electrodes placement, full-channel and multi-electrode spacings. The leakage points could be detected quickly and accurately by analyzing the potential distribution collected by each electrode. [Result] Field test results show that the new distributed electrical method can detect the change of soil resistivity quickly and effectively, the test results are reliable, the resolution of collected data points is high, the data is intuitive, the position of abnormal body is obvious. The watered area and points can be effectively delineated. [Conclusion] The method can achieve dynamic monitoring of landfill liquid leakage through out multiple tests, which also provides an effective reference for detection, monitoring and environmental or geotechnical investigations.
[Introduction] The traditional environmental geophysics method is one of the main solutions of monitoring liquid leakage of hazardous liquids in landfills. However, such methods have the defects of limited monitoring range, low flexibility, long time interval and poor monitoring accuracy. This article aims to establish a new distributed electrical method to monitor the leakage of hazardous liquids to improve the above situation. [Method] This article introduced the new method by starting from the basic principles of distributed electrical system, designation and implementation of the system's software and hardware, which contributed to the research, development and tests of the system. The new distributed electrical method adopted a data acquisition method, which had the features of one-time electrodes placement, full-channel and multi-electrode spacings. The leakage points could be detected quickly and accurately by analyzing the potential distribution collected by each electrode. [Result] Field test results show that the new distributed electrical method can detect the change of soil resistivity quickly and effectively, the test results are reliable, the resolution of collected data points is high, the data is intuitive, the position of abnormal body is obvious. The watered area and points can be effectively delineated. [Conclusion] The method can achieve dynamic monitoring of landfill liquid leakage through out multiple tests, which also provides an effective reference for detection, monitoring and environmental or geotechnical investigations.
2018, 5(S1): 215-221.
doi: 10.16516/j.gedi.issn2095-8676.2018.S1.039
Abstract:
[Introduction] This paper aims to solve the traditional geophysical methods such as pipeline instrument, ground penetrating radar, sonic detector, etc. by the limitations of its technology can not accurately determine the existing trenchless pipelines such as small diameter, large buried deep, non-metallic pipelines to obtain the space location of the difficulties, to avoid in the construction process because the pipeline can not accurately determine the location of the accident caused by the frequent occurrence of accidents. [Method] Aiming at the problem of trenchless pipeline detection, this paper put forward a detection technique based on inertial guidance to detect small diameter, large buried depth and nonmetal, designed and tested the three-dimensional measuring system of underground pipeline based on inertial navigation principle. [Result] The experimental results show that the software structure and function design of the three-dimensional measuring system of underground pipelines based on inertial navigation principle is reasonable, and the real space three-dimensional trajectory can be solved in real time for trenchless pipeline measurement.In the measurement process, the space trajectory of the pipeline can be displayed on the spot, the cross-sectional view and the three-dimensional views, the data can be stored and output, the output data format can be set according to different requirements, and the input requirements of the digitized geographic information three-dimensional data management system are satisfied. [Conclusion] The system can be applied to the detection of super buried depth, small diameter and any material, and its detection precision is high, which provides a good reference for the detection of urban difficult pipelines.
[Introduction] This paper aims to solve the traditional geophysical methods such as pipeline instrument, ground penetrating radar, sonic detector, etc. by the limitations of its technology can not accurately determine the existing trenchless pipelines such as small diameter, large buried deep, non-metallic pipelines to obtain the space location of the difficulties, to avoid in the construction process because the pipeline can not accurately determine the location of the accident caused by the frequent occurrence of accidents. [Method] Aiming at the problem of trenchless pipeline detection, this paper put forward a detection technique based on inertial guidance to detect small diameter, large buried depth and nonmetal, designed and tested the three-dimensional measuring system of underground pipeline based on inertial navigation principle. [Result] The experimental results show that the software structure and function design of the three-dimensional measuring system of underground pipelines based on inertial navigation principle is reasonable, and the real space three-dimensional trajectory can be solved in real time for trenchless pipeline measurement.In the measurement process, the space trajectory of the pipeline can be displayed on the spot, the cross-sectional view and the three-dimensional views, the data can be stored and output, the output data format can be set according to different requirements, and the input requirements of the digitized geographic information three-dimensional data management system are satisfied. [Conclusion] The system can be applied to the detection of super buried depth, small diameter and any material, and its detection precision is high, which provides a good reference for the detection of urban difficult pipelines.
2018, 5(S1): 222-227.
doi: 10.16516/j.gedi.issn2095-8676.2018.S1.040
Abstract:
[Introduction] The reasonable depth of submarine cable buried is one of the important parameters to protection cable to study the suitable depth of submarine cable under sandy soil conditions. [Method] In this paper, the penetration depth of ship anchor was studied for the commonly used ship anchor Hall and AC-14 type anchor. This study was based on the model test of sand, four weight Hall anchors and three weight AC-14 anchors were used, the anchor penetration depth test results obtained at 6 different heights respectively. [Result] The results show that the DNV code uses the energy method to calculate the depth of the anchor, which the anchor's energy is completely absorbed by the soil. This study is based on the formula of the ultimate bearing capacity, and the energy algorithm is adopted to establish the theoretical algorithm of anchor falling depth. And fitting the test data by least squares method, and getting the accurate formula of falling anchor under sand soil. [Conclusion] We demonstrate the feasibility of the experimental design and calculating method, then this formula can serve as the basis for the minimum burial depth of the submarine cable.
[Introduction] The reasonable depth of submarine cable buried is one of the important parameters to protection cable to study the suitable depth of submarine cable under sandy soil conditions. [Method] In this paper, the penetration depth of ship anchor was studied for the commonly used ship anchor Hall and AC-14 type anchor. This study was based on the model test of sand, four weight Hall anchors and three weight AC-14 anchors were used, the anchor penetration depth test results obtained at 6 different heights respectively. [Result] The results show that the DNV code uses the energy method to calculate the depth of the anchor, which the anchor's energy is completely absorbed by the soil. This study is based on the formula of the ultimate bearing capacity, and the energy algorithm is adopted to establish the theoretical algorithm of anchor falling depth. And fitting the test data by least squares method, and getting the accurate formula of falling anchor under sand soil. [Conclusion] We demonstrate the feasibility of the experimental design and calculating method, then this formula can serve as the basis for the minimum burial depth of the submarine cable.
2018, 5(S1): 228-231.
doi: 10.16516/j.gedi.issn2095-8676.2018.S1.041
Abstract:
[Introduction] With the rising of the demand for the environmental protection, Offshore wind power industry in China becomes vigorous, investors pay more attention to make sure the offsore wind power safe. [Method] In this paper, with risk management process, risks of the survey、design、building、construction、transportation、installation of the offshore substation were analyzed comprehensively. [Result] The treaments for the risks of borehole layout、confirmation of marine soil parameters、fatigue failure、building、 piling、construction window period、transportation and installation of integral assembling of the offshore substation are put forward. [Conclusion] The conclusion of this paper is the reference for the risk management of offshore wind farm.
[Introduction] With the rising of the demand for the environmental protection, Offshore wind power industry in China becomes vigorous, investors pay more attention to make sure the offsore wind power safe. [Method] In this paper, with risk management process, risks of the survey、design、building、construction、transportation、installation of the offshore substation were analyzed comprehensively. [Result] The treaments for the risks of borehole layout、confirmation of marine soil parameters、fatigue failure、building、 piling、construction window period、transportation and installation of integral assembling of the offshore substation are put forward. [Conclusion] The conclusion of this paper is the reference for the risk management of offshore wind farm.
2018, 5(S1): 232-236.
doi: 10.16516/j.gedi.issn2095-8676.2018.S1.042
Abstract:
[Introduction] As design enterprises are transforming to engineering companies, the old approach of income-based contract management can no longer meet the requirements of safe operation and risk control. [Method] Through the analysis of the contract review, this paper summarized the main problems and put forward some improvement measures and suggestions. [Result] In the process of transformation, only the suitable contract management system, can the engineering company operate in compliance and prevent risks. [Conclusion] The measures mentioned in this paper can provide useful references for the improvement of contract management system in the transformation process of the design enterprise to the engineering company.
[Introduction] As design enterprises are transforming to engineering companies, the old approach of income-based contract management can no longer meet the requirements of safe operation and risk control. [Method] Through the analysis of the contract review, this paper summarized the main problems and put forward some improvement measures and suggestions. [Result] In the process of transformation, only the suitable contract management system, can the engineering company operate in compliance and prevent risks. [Conclusion] The measures mentioned in this paper can provide useful references for the improvement of contract management system in the transformation process of the design enterprise to the engineering company.
2018, 5(S1): 237-241.
doi: 10.16516/j.gedi.issn2095-8676.2018.S1.043
Abstract:
[Introduction] The schedule management of the procurement plan has been the prime focus of the thesis. In this investigation we measured the procurement schedule using the critical chain project management. The results have shown that there are obvious advantages when the critical chain project management is applied, compared to the traditional schedule management. [Method] Thus, we demonstrated the feasibility of concluding some approach on how to manage the procurement schedule in the large-scale EPC project based on the critical chain project management. [Result] The critical chain project managemen emphasizes the importance of identifying core equipment and materials, rationally allocating human resources, setting up appropriate buffer and early warning signals, and playing the role of procurement as a bridge connecting design and construction, so as to effectively strengthen procurement schedule management. [Conclusion] This work provides some guidance for further study on work of schedule management in the EPC project.
[Introduction] The schedule management of the procurement plan has been the prime focus of the thesis. In this investigation we measured the procurement schedule using the critical chain project management. The results have shown that there are obvious advantages when the critical chain project management is applied, compared to the traditional schedule management. [Method] Thus, we demonstrated the feasibility of concluding some approach on how to manage the procurement schedule in the large-scale EPC project based on the critical chain project management. [Result] The critical chain project managemen emphasizes the importance of identifying core equipment and materials, rationally allocating human resources, setting up appropriate buffer and early warning signals, and playing the role of procurement as a bridge connecting design and construction, so as to effectively strengthen procurement schedule management. [Conclusion] This work provides some guidance for further study on work of schedule management in the EPC project.
2018, 5(S1): 242-245.
doi: 10.16516/j.gedi.issn2095-8676.2018.S1.044
Abstract:
[Introduction] At present the public cloud service develops rapidly, many companies also begin experimenting with the public cloud service, try to migrate and deploy their information systems on public clouds. [Method] The practical experiences in nearly four years were studied for China Energy Construction Co., Ltd. [Result] The paper elaborates and summarizes the deployment methods and safety protection measures of public cloud service, and develps a set of scientific and practical methods. [Conclusion] This work provides some guidance for further study on how to do well in login of information system, especially when application system deployed on public cloud.
[Introduction] At present the public cloud service develops rapidly, many companies also begin experimenting with the public cloud service, try to migrate and deploy their information systems on public clouds. [Method] The practical experiences in nearly four years were studied for China Energy Construction Co., Ltd. [Result] The paper elaborates and summarizes the deployment methods and safety protection measures of public cloud service, and develps a set of scientific and practical methods. [Conclusion] This work provides some guidance for further study on how to do well in login of information system, especially when application system deployed on public cloud.
2018, 5(S1): 246-249.
doi: 10.16516/j.gedi.issn2095-8676.2018.S1.045
Abstract:
[Introduction] In the era of knowledge economy, knowledge management is becoming more and more important. [Method] The problems were analyzed in enterprise quality management. [Result] This paper introduced the concept of knowledge management and the knowledge management system based on organization, and puts forward the idea of realizing knowledge accurate push by the knowledge management system based on business. [Conclusion] This work provides some guidance for enterprises to build knowledge management system.
[Introduction] In the era of knowledge economy, knowledge management is becoming more and more important. [Method] The problems were analyzed in enterprise quality management. [Result] This paper introduced the concept of knowledge management and the knowledge management system based on organization, and puts forward the idea of realizing knowledge accurate push by the knowledge management system based on business. [Conclusion] This work provides some guidance for enterprises to build knowledge management system.
2018, 5(S1): 250-254.
doi: 10.16516/j.gedi.issn2095-8676.2018.S1.046
Abstract:
[Introduction] With the rapid development of information technology, the replacement of traditional archives by digital archives has become a trend of development. [Method] Through the design and discussion of digital archives system, realize the centralized management of various types of archives, introduces content processing, mass storage, intelligent classification and search, multi portal technology, the establishment of digital archives management platform user centered. [Result] We should give full play to the role of digital archives as knowledge resources, improve enterprise's archives management level and work efficiency, and enhance the core competitiveness of enterprises, so as to adapt to the future development requirements of power grid enterprises. [Conclusion] The supporting capacity of digital archives system business, construction coordination ability, control ability and knowledge sharing ability, enhance the level of archival information integration, implementation of grid enterprise data and application integration, service standardization, knowledge-based resources prospect development target.
[Introduction] With the rapid development of information technology, the replacement of traditional archives by digital archives has become a trend of development. [Method] Through the design and discussion of digital archives system, realize the centralized management of various types of archives, introduces content processing, mass storage, intelligent classification and search, multi portal technology, the establishment of digital archives management platform user centered. [Result] We should give full play to the role of digital archives as knowledge resources, improve enterprise's archives management level and work efficiency, and enhance the core competitiveness of enterprises, so as to adapt to the future development requirements of power grid enterprises. [Conclusion] The supporting capacity of digital archives system business, construction coordination ability, control ability and knowledge sharing ability, enhance the level of archival information integration, implementation of grid enterprise data and application integration, service standardization, knowledge-based resources prospect development target.
2018, 5(S1): 255-261.
doi: 10.16516/j.gedi.issn2095-8676.2018.S1.047
Abstract:
[Introduction] The paper aims to analyze the mountain wind fan sector management after the initial design and wind farm was put into the actual operation of differences, reducing the loss of wind power generating capacity, therefore it is necessary for mountain wind field fan sector management design is optimized. [Method] Based on the operation of a certain period after the necessity of the mountain wind fan sector management optimization, economy and expected risk, response analysis, put forward the corresponding optimization solution. [Results] The results show that the optimized fan sector management can greatly reduce the power loss of the wind farm under the premise of ensuring the safety of the fan. [Conclusion] There are certain differences between the initial design of fan sector management and the actual operation, so it is necessary to optimize the fan sector management design. At the same time, the results can also be used as reference for other mountain wind farms to optimize the fan sector management and operation and improve the power generation capacity.
[Introduction] The paper aims to analyze the mountain wind fan sector management after the initial design and wind farm was put into the actual operation of differences, reducing the loss of wind power generating capacity, therefore it is necessary for mountain wind field fan sector management design is optimized. [Method] Based on the operation of a certain period after the necessity of the mountain wind fan sector management optimization, economy and expected risk, response analysis, put forward the corresponding optimization solution. [Results] The results show that the optimized fan sector management can greatly reduce the power loss of the wind farm under the premise of ensuring the safety of the fan. [Conclusion] There are certain differences between the initial design of fan sector management and the actual operation, so it is necessary to optimize the fan sector management design. At the same time, the results can also be used as reference for other mountain wind farms to optimize the fan sector management and operation and improve the power generation capacity.
2018, 5(S1): 262-266.
doi: 10.16516/j.gedi.issn2095-8676.2018.S1.048
Abstract:
[Introduction] Under construction in 220 kV Huayue line submarine tunnel project, some emergency danger occurred because of seawater inflow. [Method] The advantage of freshwater freezing technology had been tried to solve this problem. After several tests of the seawater and soil sample, some calculations were done according to the test data and freshwater freezing theory. [Result] The problem has been resolved successfully by seawater freezing. The seawater freezing technology has been used for the first time in the nation. Due to this method, the construction can be continuously done according to existing plan, otherwise this tunnel may have to scrap. [Conclusion] The seawater freezing technology is very efficient and economic to deal with seawater inflow of tuneling under seawater.
[Introduction] Under construction in 220 kV Huayue line submarine tunnel project, some emergency danger occurred because of seawater inflow. [Method] The advantage of freshwater freezing technology had been tried to solve this problem. After several tests of the seawater and soil sample, some calculations were done according to the test data and freshwater freezing theory. [Result] The problem has been resolved successfully by seawater freezing. The seawater freezing technology has been used for the first time in the nation. Due to this method, the construction can be continuously done according to existing plan, otherwise this tunnel may have to scrap. [Conclusion] The seawater freezing technology is very efficient and economic to deal with seawater inflow of tuneling under seawater.
2018, 5(S1): 267-274.
doi: 10.16516/j.gedi.issn2095-8676.2018.S1.049
Abstract:
[Introduction] In order to promote the development of new theories and new technologies in the data center of the power industry, and provide academic exchange platforms for data center scholars and builders in the power industry, the first China Power Industry Data Center Summit Forum was held in Guangzhou on June 13, 2018. [Method] The conference was co-sponsored by the Data Center Working Group of the Information Engineering Professional Committee of China Engineering Construction Standardization Association and China Energy Construction Group Guangdong Electric Power Design Institute Co., Ltd., and co-organized by Guangzhou Power Supply Bureau Communication Network Co., Ltd. [Result] The conference focused on the status quo of China's power industry data center, open and innovative technologies, investment and financing, and sustainable development. It explored the current development path of the data center of the power industry, promoted exchanges and cooperation between scholars and builders in the power data center industry. [Conclusion] The development of data centers in the power industry is of great significance.
[Introduction] In order to promote the development of new theories and new technologies in the data center of the power industry, and provide academic exchange platforms for data center scholars and builders in the power industry, the first China Power Industry Data Center Summit Forum was held in Guangzhou on June 13, 2018. [Method] The conference was co-sponsored by the Data Center Working Group of the Information Engineering Professional Committee of China Engineering Construction Standardization Association and China Energy Construction Group Guangdong Electric Power Design Institute Co., Ltd., and co-organized by Guangzhou Power Supply Bureau Communication Network Co., Ltd. [Result] The conference focused on the status quo of China's power industry data center, open and innovative technologies, investment and financing, and sustainable development. It explored the current development path of the data center of the power industry, promoted exchanges and cooperation between scholars and builders in the power data center industry. [Conclusion] The development of data centers in the power industry is of great significance.
