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RSS2020 Vol. 7, No. S2
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2020, 7(S2): 1-10.
doi: 10.16516/j.gedi.issn2095-8676.2020.S2.001
Abstract:
Introduction With the development of metering and communication technology， the basic hardware conditions for implementing demand response have been met， and the implementation of demand response projects has been put on the agenda. The selection of pilot regions for demand response implementation requires an assessment of the region's demand response potential. Method In order to solve the problem which the price elasticity coefficient was only used in the demand response potential evaluation of general load at this stage， and the accurate data of price elasticity coefficient was difficult to obtain， this paper innovatively designed a demand response potential evaluation method based on two-stage clustering analysis. This method fully considered the user's suitability and the characteristics of the user process/equipment， which mainly affect the demand response potential. Result A case study of 386 users in a city in Guangdong has been carried out， and the average demand response potential for the 250 hours with a higher load in the city is 3.2% of the city's highest load. Conclusion Compared with the current demand response of the various electricity markets in the United States， it is found that the results of this evaluation method are reasonable and have certain practical value.
2020, 7(S2): 11-17.
doi: 10.16516/j.gedi.issn2095-8676.2020.S2.002
Abstract:
Introduction Traditional large-scale enterprises are geographically dispersed， and information investment is insufficient with high security risks. Cloud computing technology effectively integrates enterprise information resources and builds a large enterprise-level cloud platform. It has become the core supporting platform for the digital transformation of traditional large enterprises. Cross-domain resource scheduling and disaster recovery are key technologies. Method Based on the comprehensive application of cloud computing， big data and traditional disaster recovery technology， this paper explored the implementation model of cloud management requirements such as cross-domain resource scheduling and backup disaster recovery in large-scale cross-regional and hierarchical enterprise cloud platforms. Result After the practice test， the construction goal of unified management of multi-site resources of large enterprise cloud platform， unified use of IT resources， and intelligent completion of global resource balance and disaster tolerance was initially realized. Conclusion The cross-domain resource scheduling and disaster tolerance model recommended in this paper has important guiding role for the construction and management of large enterprise cloud platform.
2020, 7(S2): 18-24.
doi: 10.16516/j.gedi.issn2095-8676.2020.S2.003
Abstract:
Introduction In order to solve the limitations of single application architecture system of power grid information system， such as low performance， low development efficiency， difficult to expand， poor fault tolerance etc. Method This paper proposed that the construction of power grid information system adopts micro service architecture. Result We summarizes the microservice architecture scheme， service splitting scheme， containerization ， development of operation and maintenance scheme of power grid informatization. Conclusion The electric power information system transformed by microservice has brought significant improvement to system granularity， software quality and system operation and maintenance. It provides microservice technical route for realizing richer business scenarios， shorter system delivery cycle and higher quality system delivery requirements of power grid informatization.
2020, 7(S2): 25-32.
doi: 10.16516/j.gedi.issn2095-8676.2020.S2.004
Abstract:
Introduction Due to the differences in economic development， technological progress， management methods and other factors， the line loss management level of district and county-level power companies is uneven， and the line loss management level of district and county-level power companies directly affects provincial and municipal power line losses. Therefore， the establishment of a reasonable and sound district-level line loss management evaluation system is essential for the improvement of line loss management level of provincial and municipal power companies. Method This paper firstly combined the line loss management impact index， established a sound line loss management index system for district and county power supply enterprises， and an improved analytic hierarchy process was proposed to improve the objectivity of the analytic hierarchy process calculation results， so that the evaluation was determined. Result The weight of the system is more reasonable and correct. Finally， the statistical analysis method-factor analysis method is used to verify and analyze the evaluation system. Conclusion The Line Loss Management Evaluation System which further explains the correctness and rationality of the system， and provides technical and practical reference for the provincial and municipal power companies to improve the management level of line loss.
2020, 7(S2): 33-39.
doi: 10.16516/j.gedi.issn2095-8676.2020.S2.005
Abstract:
Introduction In order to avoid poor connection of 10 kV underground cable between main grid and distribution network because of the influence of slope. Method Aiming at the 1.2 m × 1.2 m cable trench commonly used in the South China Power Grid， this article set a clear principle of comparison， and through analysis and comparison of various schemes. Result A set of solution schemes were formulated for different topography and supporting conditions. Conclusion The solution schemes enables the cable of distribution network project to connect smoothly into substation through cable trench， and solves the problem of poor connection between the main grid and distribution network of 10 kV underground cable.This schemes can be solidified in the standardization work to form part of the standard design scheme.
2020, 7(S2): 40-44.
doi: 10.16516/j.gedi.issn2095-8676.2020.S2.006
Abstract:
Introduction The 500 kV GIL pipeline of a project has the characteristics of a large single span and a high distance to ground. It is necessary to verify the seismic performance of gas-insulated metal-enclosed transmission lines （GIL）. Method A three-dimension finite element model of GIL pipeline physical structure was established to perform a seismic response analysis. Result The mode shape characteristics of the structure were obtained through modal analysis. The seismic performance of the GIL under different seismic excitations was then specifically evaluated by using the response spectrum analysis method. Conclusion The 500 kV GIL transmission pipeline structure has a certain safety factor under the earthquake with a seismic intensity of 7 degrees.
2020, 7(S2): 45-49.
doi: 10.16516/j.gedi.issn2095-8676.2020.S2.007
Abstract:
Introduction The paper aims to improve the uplift bearing capacity of transmission tower foundations and to save the cost of project. Method In this paper， a method for calculating the uplift bearing capacity of pile foundation with multiple expanded heads was proposed， and its bearing capacity and economy were compared with the traditional pile foundation. Result The results we obtained demonstrate that with the same bearing capacity， the multiple heads foundation saves 4% ~ 26% of concrete compared with the single head foundation， and increases with the increase of the ratio of depth to diameter. Conclusion Our data suggest that using the multiple heads foundation in large-scale transmission lines can greatly improve the uplift bearing capacity of the foundation and save the concrete. In the same condition， the uplift capacity of multiple heads foundation improves 9%~34% comparing to the single head foundation.
2020, 7(S2): 50-55.
doi: 10.16516/j.gedi.issn2095-8676.2020.S2.008
Abstract:
Introduction With the putting into operation of Shenzhen Pumped Storage Power Station， the pressure of power supply in Shenzhen area will be reduced， the peak regulation range of thermal power and Western power will be reduced， the grid connected new energy generation will be promoted. Method Due to the various operating modes of Shenzhen Pumped Storage Power Station， in order to verify the stability of the power system after Shenzhen Pumped Storage Power Station grid connected， the operation modes were simulated under four operation modes： maximum operating plan in summer， minimum operating plan in summer， maximum operating plan in winter， minimum operating plan in winter， and the stability and control measures of the power system after serious fault disturbance were studied. Result According to the simulation results， two sets of setting value schemes are proposed for the out of step splitting device of Shenzhen Pumped Storage Power Station. When four units of the power station are connected to the grid through the 220 kV Yuan-Xu lines， the setting value of the voltage is set to 0.7 pu. In other modes， the setting value of the voltage is set to 0.5 pu， so as to ensure the units can be split timely and ensure the safety and stability of the system after power system failure under various conditions. Conclusion The results of stability analysis provide a reference for operators， and some of the research results have been applied to the actual operation of field equipment.
2020, 7(S2): 56-61.
doi: 10.16516/j.gedi.issn2095-8676.2020.S2.009
Abstract:
Introduction In order to reduce or circumvent various risks in the construction and operation of pumped storage power station projects， this paper aims to establishe a risk assessment system for them. Method Firstly， we established the SWOT-PEST risk analysis matrix by analyzing the development environment， then the risk factors were identified. Secondly， we established the risk evaluation model by using grey correlation analysis and TOPSIS method. Result The results we obtained demonstrate the validity of the model and several rationalization suggestions are put forward. Conclusion This work provides some guidance on risk assessment of similar pumped storage power station projects and further study on risk assessment model.
2020, 7(S2): 62-67.
doi: 10.16516/j.gedi.issn2095-8676.2020.S2.010
Abstract:
Introduction The paper aims to better realize the monitoring and control of large-scale new energy centralized Internet access and improve the coordination ability between new energy base and power grid dispatching center to describe a typical scheme of wind-light-storage multi-energy complementary power centralized control system. Method To ensure the typical scheme met the actual needs of the project， the overall scheme， system architecture， function and performance requirements of the centralized control system were studied in detail， and the relationship of the system and the traditional grid control automation system was also studied based on years of experience in power dispatching operation design. Result The results of careful research and analysis show that the designed typical scheme of the centralized control system effectively upgrades the dispatching automation system of the new energy base. Conclusion Our data demonstrates that the typical scheme of the centralized control system satisfies the engineering design requirements and improves the rationality and practicability of the design of the wind-light-storage multi-energy complementary power centralized control system， which can provide guidance for specific engineering applications.
2020, 7(S2): 68-74.
doi: 10.16516/j.gedi.issn2095-8676.2020.S2.011
Abstract:
Introduction The acoustic tomography （AT） is regarded to be a promising tomography method for temperature distribution measurement， and improving the reconstruction accuracy plays a crucial role in actual applications of the technology. Method This paper proposed a two-stage reconstruction method. First，the original measurement domain was divided into a group of coarse grid elements to reduce the number of the unknown variables and to alleviate the ill-posed nature of the inverse problem in the AT temperature distribution measurement. A new cost function was proposed to convert the AT inverse problem into an optimization problem，which was solved by the Nelder-Mead simplex algorithm to get the temperature distribution on coarse grid elements. In the second stage，the measurement domain was further divided into finer discrete grid elements，and the extreme learning machine was deployed to predict the temperature distribution on the grid elements. Result Numerical simulation results indicate that the proposed reconstruction algorithm not only ensures the numerical stability of the inverse problem in the AT temperature distribution measurement， but also improves the reconstruction accuracy. Conclusion The research findings provide an effective method for the numerical solution of the inverse problem in the AT temperature distribution measurement and the improvement in the reconstruction accuracy.
2020, 7(S2): 75-81.
doi: 10.16516/j.gedi.issn2095-8676.2020.S2.012
Abstract:
Introduction For the height is higher， the loads are huge， side bunker is the difficulty of structure design in advanced ultra-supercritical coal-fired units. The paper aims to solve this problem. Method SAP2000 and SATWE were used to analysis the structure， structure seletion and seismic performance calculation and analysis、analysis and design of base、shear wall and coal beam were analyzed. Result The results show that the type selection of shear wall structure of single span side coal bunker is reasonable， and the reinforcement of coal bunker girder has the characteristics of deep bending component， which needs to be designed according to the deep bending component. Conclusion The analysis and discussion provided in this paper provide a better reference for similar projects.
2020, 7(S2): 82-88.
doi: 10.16516/j.gedi.issn2095-8676.2020.S2.013
Abstract:
Introduction With the promotion of comprehensive utilization of natural gas and the encouragement of clean energy power generation， the construction of large combined-cycle power plant is one of the important forms to achieve this goal. Method In this paper， through case study， comparative analysis and summary， the main power house arrangement design of the large single-shaft combined-cycle power plant was studied. Result The paper states the main power house design principle of the large single-shaft combined-cycle power plant， puts forward two arrangement schemes that of the combined power house and the independent power house， and summarizes the technical characteristics and economic efficiency of the two arrangement schemes. Conclusion The combined power house arrangement scheme and the independent power house arrangement scheme are both mature， reliable and each has its own characteristics. Because of the advantages of saving land， saving investment and beautiful appearance， the combined power house arrangement is worth to be adopted and popularized. And also it provides reference for the main power house layout design of the large combined-cycle power plants in the future.
2020, 7(S2): 89-95.
doi: 10.16516/j.gedi.issn2095-8676.2020.S2.014
Abstract:
Introduction In order to analyze the impact of the single rack-joint side bunker scheme on the capacity， investment and maintenance of the main building of 350 MW thermoelectric unit. Method Through the introduction of the optimization process of the layout pattern and structure size of the front coal bunker， side coal bunker， single row rack and single frame of the 2x350 MW off-site expansion of the supercritical unit project of Guodian Lanzhou thermal power Co.， Ltd.， the impact of different layout plans of the project on the investment in the early stage and the operation and maintenance in the later stage was compared. Result On the premise of facilitating safe and normal operation and maintenance of the unit， the project adopts this scheme to achieve a good level of 0.287 m3 /kW. Conclusion Through analysis， the main building arrangement design scheme has a good practical value， which can be used as a reference for similar urban cogeneration projects.
2020, 7(S2): 96-100.
doi: 10.16516/j.gedi.issn2095-8676.2020.S2.015
Abstract:
Introduction The automatic voltage control （AVC） system is an important tool for reducing network loss， improving the network voltage quality， and ensuring secure and stable operation of power network as well as the power plant. Method Since there was no special AVC device in Vietnam， practice of AVC based on the power plant Distributed Control System （DCS） was carried out， in which the information interaction with Vietnam Power Grid Dispatching Center， and the AVC on/off & security constraint logic in DCS had been established. Result Effective regulation of reactive power – voltage has been realized， satisfying the technique requirement of Vietnam power network. Conclusion Therefore， it can provide a reference for the realization of automatic voltage control in overseas power plant projects.
2020, 7(S2): 101-106.
doi: 10.16516/j.gedi.issn2095-8676.2020.S2.016
Abstract:
Introduction During the actual operation of the power plant， due to the inaccurate calculation of the effective height of the water seal， the water seal was pulled or worn， or the water seal was not well drained， thus affected the economic and safe operation of the unit. Method In order to provide a more accurate calculation of the effective height of the water seal in the subsequent works， the influencing factors were analyzed and discussed which were the position of the water seal， the structural size of the water seal， the back pressure change of the condenser， the pressure change of the shaft seal fan and the hydrophobic vaporization. Result The influencing factors of the above factors on the calculation of the effective height of the water seal are obtained. When calculating the effective length of the U-shaped water seal， the influence of the above influencing factors needs to be comprehensively considered， the initial calculation value is corrected， and the height of the multi-level water seal is reasonably selected. Conclusion So as to solve the problems occurring at the scene，and the guiding opinions and precautions for design， construction and commissioning are proposed.
2020, 7(S2): 107-112.
doi: 10.16516/j.gedi.issn2095-8676.2020.S2.017
Abstract:
Introduction Hydraulic coupler in thermal power plants of electric boiler feed water pump set of frequency conversion energy-saving renovation， analysis of whether to retain the hydraulic coupling regulating function. Method Through theoretical analysis of energy consumption of hydraulic coupling itself， at the same time， feed water pump frequency conversion to the same type unit after transforming， comparing the running situation of the actual cases from the aspects of safety， energy saving and other hydraulic coupler in thermal power plants electric adjustment of boiler feed water pump group of inverter whether keep hydraulic coupling regulating function were discussed. Result Electric hydraulic coupler to adjust the boiler feed water pump group of inverter is not retained hydraulic coupling plan than keep hydraulic coupling overall energy saving rate is high， the economic， security and enough guarantee. Conclusion Electric hydraulic coupler to adjust the boiler feed water pump group of inverter， don't keep hydraulic coupling regulating function scheme is more suitable.
2020, 7(S2): 113-118.
doi: 10.16516/j.gedi.issn2095-8676.2020.S2.018
Abstract:
Introduction In order to reduce the investment and operation cost of ash conveying system coal-fired power plant Method This paper introduces an engineering example of a 2×350 MW circulating fluidized bed power plant project， in which the large ash hopper of electrostatic precipitator is used to replace the conventional ash silo of the power plant， and the fly ash is directly loaded from the ash hopper outlet of the Electrostatic precipitator and transported outside without the ash silo and pneumatic ash conveying device. Result The investment of the two unite save 10.78 million yuan， and the power consumption of the air compressor save 2.12 million yuan per year. In addition， the consumables and maintenance work of the air compressor are reduced. Conclusion Integration design scheme of Electrostatic precipitator and ash convey ing system in coal-fired power station may save the investment and operation cost.
2020, 7(S2): 119-122.
doi: 10.16516/j.gedi.issn2095-8676.2020.S2.019
Abstract:
Introduction There will be lot of foam in seawater discharge from seawater desulphurization coal-fired power plants， which will have adverse effects on environmental vision. In order to meet the requirements of environmental permit in Vietnam， foam need to be eliminated. Method Through observing and analyzing mechanism of seawater foam generation about CW cooling after seawater FGD and aeration basin，and did some tests. It was proposed a scheme of centralized physical spray scheme to defoaming. Results The results we obtained demonstrate that this scheme is easy for construction and maintenance without stopping operation， bringing more obvious effect with less investment . There is no need to use chemicals for defoaming， which does not increase the risk of chemicals to seawater. Conclusion This scheme provides a good reference for foam defoaming of seawater discharge in similar coal-fired power plants.
2020, 7(S2): 123-130.
doi: 10.16516/j.gedi.issn2095-8676.2020.S2.020
Abstract:
Introduction With the advancement of urban sewage sludge reduction， resource utilization， stabilization and harmless treatment， the construction of sludge unloading and storage workshop is one of the important forms to help achieve this goal. Method This paper analyzed the architectural design features of the sludge unloading and storage workshop by summarizing and case analysis. Result Summarize the design principles that should be followed in the design of the sludge unloading and storage workshop， as well as the design points of functional flow lines， safety fire protection， detailed nodes and appearance. Conclusion The construction design of the sludge unloading and storage workshop is based on the process flow， and integrates the architectural design methods， people-oriented， corporate culture and other aspects to provide reference for the architectural design of the sludge unloading and storage workshop.
2020, 7(S2): 131-136.
doi: 10.16516/j.gedi.issn2095-8676.2020.S2.021
Abstract:
Introduction In order to analyze the flow field characteristics of the longitudinal jet ventilation system in the tunnel. Method The CFD software was used to simulate the longitudinal jet ventilation system of highway tunnel with different number of jet fans， and the flow field characteristics were analyzed. Result It can be seen that， due to the jet action of the jet fan， the jet airflow is attached to the top of the tunnel. And the distinct low-speed flow area is formed near the ground within 30 m after the jet fan. And at the same time， increasing jet fan can increase wind speed in the tunnel. Conclusion It is suggested to set a small downward inclination angle at the outlet of the jet fan or to reduce the installation height of the jet fan appropriately in order to improve the flow field.
