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RSS2021 Vol. 8, No. S1
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2021, 8(S1): 1-9.
doi: 10.16516/j.gedi.issn2095-8676.2021.S1.001
Abstract:
Introduction Affected by typical micro-topography， the wind speed of overhead transmission lines will increase. This paper aims to study the influence of micro-topography on the force of transmission tower. Method To investigate the parameters and the distribution law of topographic factors， we compared topographic factors of two typical mountain topographies for the crest and the escarpment among China， America and Australia codes. The force analysis of transmission towers were carried out with different codes， different route directions and different locations. Result The results we obtained demonstrate that the distribution law of topographic factor of the three codes is basically the same， and the degree of influence by slope， horizontal distance and height is different， the force of main member of tower body is the maximum when the transmission line runs along the top of the mountain， the influence of topographic factor on the force of tower is greater than wind speed increased by 10%. Conclusion It is suggested that the transmission line should cross the top of the mountain perpendicularly as much as possible， and the influence of topographic factor should be considered for transmission towers located in two typical mountain topographies.
2021, 8(S1): 10-19.
doi: 10.16516/j.gedi.issn2095-8676.2021.S1.002
Abstract:
Introduction In order to improve the disaster investigation ability of power grid emergency repairing team， this paper proposes a design and implementation of CAVE virtual reality technology， which provides a new train of thought for training power grid disaster investigation skills. Method Hardware and software solutions of the system were described in detail. Besides， a comprehensive evaluation was applied and described by utilizing typical test cases. Result By using innovative and advanced technologies， the sysetem reaches significantly effective results， which can fully meets the training requirements. In addition， compared with traditional training method， CAVE virtual reality technology system has many advantages， such as strong visual immersion， multi-dimensional experience， good human-computer interaction， and high freedom in creating special scenes. Conclusion The CAVE virtual reality system brings a new and effective method for training power grid disaster investigation skills，and provides an important reference for skill training implementation mode in relavant fields.
2021, 8(S1): 20-25.
doi: 10.16516/j.gedi.issn2095-8676.2021.S1.003
Abstract:
Introduction Power Internet of things is an important means for power grid companies to make digital transformation and improve the level of power grid intelligence. Method This paper introduced the general situation and architecture of power Internet of things， focused on the functional requirements and development goals of each level， and put forward the technical direction of developing power Internet of things according to the differences among comprehensive power companies， distribution network companies and power sales companies. Results Application solutions were put forward in the fields of transmission network， distribution network， marketing and power consumption， and enterprise management. Conclusion The scheme has been well applied in various power grid companies.
2021, 8(S1): 26-32.
doi: 10.16516/j.gedi.issn2095-8676.2021.S1.004
Abstract:
Introduction After the ice disaster， in order to ensure the safety and reliability of power supply of the power grid， it is necessary to repair or rebuild the power grid in the disaster-stricken area to meet the requirements of power grid safety and reliability. However， the power grid facilities involved are restricted by external factors and can fully meet the requirements of regulations and specifications. Ice disasters on double-circuit towers will increase the difficulty of power grid repair or reconstruction. In order to minimize the static and dynamic load of the tower after ice disaster， the paper proposed to directly reduce the number of sub-conductors to improve the overall ice resistance of the tower. Method In combination with the existing 500 kV double circuit project on the same tower， after an ice disaster occured， one circuit was removed and the ice accident section was bypassed by a new single circuit， and the other circuit was connected to the original double circuit six-circuit cross-arm through each cross-arm with two sub-conductors. Each two cross-arms constituted a loop arrangement to be modified. Result The results we obtained demonstrate that this proposed scheme can not only improve the ice resistance of the main inclined material of the tower， but also greatly improve the ice resistance of the cross arm and meet the requirements of the differentiated design of the State Grid. Conclusion Two-split conductors with small cross-sections will cause changes in electrical performance. Our data suggests that such changes are considered acceptable in areas with high forest coverage， complex terrain， and poor visibility conditions.
2021, 8(S1): 33-38.
doi: 10.16516/j.gedi.issn2095-8676.2021.S1.005
Abstract:
Introduction An assessment method based on ATP simulation model automatic generation was proposed to solve the problems of low efficiency in model establishment and complex assessment process when analyzing and evaluating the lighting performance of overhead transmission line by simulation. Method The working thoughts， general framework and implementation step of the proposed method were presented at first. Based on the resolution of the structure of the ATP simulation model file， the ATP simulation model automatic generation was realized through coding the data cards in model file according to initial data of transmission line， and then connecting all the cards effectively. The simulation results automatic determination was realized through executing the simulation model automatically and then reading the file containing the simulation results. The method of model parameter auto-adjustment according to simulation results was designed， and finally the auto-assessment of lighting protection performance of overhead transmission line was achieved. Result The proposed method is verified by a specific application example，the calculated value of lightning current with breakdown is 13.7 kA， and the breakdown occurs in phase B， which is consistent with the setting of hitting phase B in the simulation model，the results show the feasibility and effectiveness of the proposed method. Conclusion The proposed method can improve the accuracy and efficiency in assessing the lighting protection performance of transmission line utilizing simulation method， and has practical value.
2021, 8(S1): 39-45.
doi: 10.16516/j.gedi.issn2095-8676.2021.S1.006
Abstract:
Introduction Middle passage back-to-back flexible HVDC Converter Station is located in Zengcheng Economic Development Zone in Guangzhou， the northeast of the site is the existing residential district， the east is an planned industrial district， and the southwest is a natural village. The project construction shall consider the coordination and consistency with the surrounding environment. Method A comparative study and optimal design of transformer arrangement scheme， starting circuit arrangement scheme， and 500 kV AC distribution device arrangement scheme were carried out by zone. Result The equipment selection and layout of the station are optimized， indoor transformer， indoor disposition of start-up circuit， GIS branch bus for the connection of 500 kV distribution equipment in the northwest side are recommended. Conclusion This study provides ideas and methods for improving the coordination of construction of flexible HVDC Converter Station with the surrounding environment.
2021, 8(S1): 46-52.
doi: 10.16516/j.gedi.issn2095-8676.2021.S1.007
Abstract:
Introduction At present， the low to medium voltage distribution network projects have the characteristics of large number and scattered locations. In the actual management， there are problems such as simple and extensive cost management， mismatch and inconsistent costs and standards， which restrict the standardization and refinement of projects management， and the applicability of existing standards and costs need to be further improved and optimized. Method Therefore， Hainan Power Grid carried out a study on the construction cost of low to medium voltage distribution network based on lean management. As the basis of this research， this paper made a comparative analysis of the standards for low to medium voltage distribution networks for the first time， including planning and design standards.This paper selected Guangdong Power Grid with good construction efficiency as the benchmark， analyzed the differences between Hainan and Guangdong Power Grid standards. Result This paper evaluates the applicability of Hainan's medium and low voltage distribution network standard. Conclusion This work are helpful to improve the rationality of planning standards， the adaptability and refinement of design standards for the Hainan Power Grid low to medium voltage distribution network， which comprehensively improves the construction level of the distribution network of Hainan Power Grid.
2021, 8(S1): 53-58.
doi: 10.16516/j.gedi.issn2095-8676.2021.S1.008
Abstract:
Introduction Life Cycle Asset management （LCAM） enables an organization to improve their asset potential or actual value. In order to ensure the optimization of the asset life cycle cost， and to accurately analyze the asset life cycle cost（LCC），it is necessary to quantify the LCC and establish a operable method for accumulate and apportion the LCC［1 ］. Method By analysing the direct cost， indirect cost and other related cost in the whole life cycle of the asset equipment， we standardized the accumulation and approtionment process of the asset LCC， and optimized the composition of the asset LCC. Result By optimizing the accumulation and approtionment method， the whole LCC of equipment can be calculated. Conclusion It provides aided decision-making for power system planning and design， technical and economic comparison of investment projects， equipment procurement， LCAM evaluation， and promotes the practice of LCAM.
2021, 8(S1): 59-64.
doi: 10.16516/j.gedi.issn2095-8676.2021.S1.009
Abstract:
Introduction The paper aims to make up for the blank of cost composition and pricing standard of distribution network project in south china sea islands， and provide a reference for further standardization of cost management of distribution network project in the future. Method The paper presented a study on the pricing system with the characteristics of South China Sea Islands based on the current industry pricing standards， taking into account the natural conditions， climate characteristics ， geographical environment of the South China Sea Islands and the actual situation of the distribution network project construction. Result The paper proposes a method of project pricing system and price adjustment mechanism in line with the characteristics of South China Sea Islands. Conclusion More suggestions such as improving the project pricing system in line with the specificities of South China Sea Islands， preparing supplementary quotas and establishing project cost information system for distribution network projects of South China Sea Islands are proposed.
2021, 8(S1): 65-69.
doi: 10.16516/j.gedi.issn2095-8676.2021.S1.010
Abstract:
Introduction In order to explore the reasonable wet towing method of three tube jacket foundation and study its self-floating wet-towing floating characteristics， Method the numerical simulation software Moses was used to analyze the static stability and dynamic response of soild-floating body and air-floating body in towing for a certain offshore wind turbine three-bucket jacket foundation in this paper. The differences of static stability and towing characteristics between soild-floating body and air-floating body of three bucket foundation for offshore wind turbine under the influence of the same environmental load were clarified. Result The results show that the static stability of air-floating structure is better than that of solid-floating structure， but the motion response amplitude of solid-floating body is lower than that of air-floating structure. Conclusion We demonstrate the feasibility of the method and it provides some guidance for further application.
2021, 8(S1): 70-74.
doi: 10.16516/j.gedi.issn2095-8676.2021.S1.011
Abstract:
Introduction In order to meet the requirements of production monitoring and operation management of offshore converter stations， the overall design， main performance and functional requirements of the intelligent auxiliary control system for offshore converter stations is proposed. Method The system was composed of electrical equipment online monitoring， ventilation and air conditioning monitoring subsystem， submarine cable monitoring subsystem， environmental monitoring subsystem， video monitoring subsystem， fire alarm subsystem， fog whistle monitoring subsystem， robot inspection subsystem， etc. It realized the linkage control between the subsystems through the auxiliary control system background， including fire fighting， HVAC， video， etc. Result The functions of data collection， operation monitoring， operation control and system linkage were realized. Conclusion Therefore， the solution meets the technical requirements of unattended operation and can effectively reduce the operation and maintenance costs of offshore wind farms.
2021, 8(S1): 75-79.
doi: 10.16516/j.gedi.issn2095-8676.2021.S1.012
Abstract:
Introduction As an important energy-saving equipment in reverse osmosis seawater desalination system， the system design of energy recovery unit is very important. Method In this paper， from the aspects of design principle， working principle， design calculation， equipment configuration and selection， the three most commonly used energy recovery unit system designs were compared in detail. Result After the system design comparison， the advantages and disadvantages of the three energy recovery units are obtained for designers to choose. Conclusion This paper provides designers with targeted and effective design guidance and improves design efficiency.
2021, 8(S1): 80-87.
doi: 10.16516/j.gedi.issn2095-8676.2021.S1.013
Abstract:
Introduction In this paper， the structural design scheme of the main plant of 9H class gas-steam combined cycle unit is studied， and the best arrangement of main plant is found out. Method Through improvement of structure type， calculation method and design parameters were discussed and analyzed technology， investment， construction period and construction organization in detail. Result Based on research results， both reinforced concrete and steel structure are acceptable. But reinforced concrete structure with steel roof truss is recommended because of economic factors. Conclusion It is recommended that the main plant use reinforced concrete structure and the main bearing structure of the main plant building surface adopt steel roof truss.
2021, 8(S1): 88-92.
doi: 10.16516/j.gedi.issn2095-8676.2021.S1.014
Abstract:
Introduction In recent years， the problem of municipal garbage in China has become increasingly prominent， the grate furnace waste power plant has been developed rapidly in China. Method Based on previous engineering experience at the 850 t/d project， this paper introduced the main process systems of grate furnace garbage power station， including fuel supply system， combustion system， steam water system， flue gas purification system， ash removal system， etc. Result This paper analyzes and discusses the determination of fuel calorific value， the size of garbage pool， the selection of driving specifications， the selection of grate furnace inlet， primary air， secondary air， starting combustion， auxiliary combustion， steam-water system parameters， and the setting of treatment systems for dust， NOx， dioxin， heavy metals and acidic pollutants in flue gas. The advantages and disadvantages of SNCR and SCR processes in NOx removal methods， dioxin removal methods， dry， semi-dry and wet systems for acid pollutant removal are compared and explained The layout of the main building in typical engineering cases is briefly explained. Conclusion It can be used for reference in engineering design， parameter selection， system design and layout optimization of similar projects.
2021, 8(S1): 93-96.
doi: 10.16516/j.gedi.issn2095-8676.2021.S1.015
Abstract:
Introduction In order to optimize the typical design scheme of flue gas， air and pulverized coal pipeline， which had been applied in many projects， this paper planned to verify the implementation effect before and after the design optimization， so as to further improve the typical optimization scheme system for verification. Method Taking a specific project as an example， this paper adopted the research method of comparing the absolute value and difference between the theoretical calculated value and the actual test value， and carried out a comparative study on the theoretical pressure drop and the field test value about air and flue gas duct as well as pulverized coal pipe. Result The results showed that the optimization effect of theoretical calculation was inferior to the measured one. Conclusion The optimization scheme was beneficial to reduce the resistance level of the whole pipe system， so it will make the actual implementation effect due to the theoretical calculation value. The research results of this paper has certain reference significance for the calculation of the resistance of flue gas， air and pulverized coal pipeline.
2021, 8(S1): 97-101.
doi: 10.16516/j.gedi.issn2095-8676.2021.S1.016
Abstract:
Introduction In order to improve the operation efficiency and the economic benefits of coal-fired units， this paper takes the heating reconstruction project of Zhuhai Power Plant as an example to explore the way which can break the operating predicament of coal-fired power unit. Method By analyzing the heating reconstruction project of Zhuhai Power Plant， this paper conducted a comprehensive discussion on the feasibility， control strategy and construction effect of this project. Result The analysis results showed that the coal consumption of the unit was significantly reduced after the heating reconstruction， and the increase of heat supply increased the heat power ratio， which can also strive for more planned electricity and the power generation base value. Conclusion Heating reconstruction is a valuable optimization way for coal-fired unit with suitable conditions， which has very important guiding significance and economic value.
2021, 8(S1): 102-109.
doi: 10.16516/j.gedi.issn2095-8676.2021.S1.017
Abstract:
Introduction Based on the field survey data of mine geological environment in Guangzhou and the analysis of remote sensing interpretation results， taking into account the characteristics of mineral resources types and their relatively single mining methods，the evaluation system is constructed by selecting 12 indexes from five aspects， i.e. the degree of difficulty of landform and landscape destruction and control engineering， occupation and destruction of land， geological disasters， water and soil environmental impact， and geological environmental conditions. Method We used the expert- analytic hierarchy process （AHP） method to determine the weight of the index， and the comprehensive evaluation method to establish the geological environment impact assessment model， combined with the GIS platform and spatial analysis technology to carry out the geological environment impact assessment of mines in Guangzhou. Result The results show that the study area and its influence range are divided into 106 affected areas， of which 36 are seriously affected， involving 91 mines； 52 are relatively serious impact areas， involving 105 mines； 18 are comparatively mild impact areas， involving 121 mines. It is suggested that 36 areas with serious impact on mine geological environment shall be listed as key control areas of mine geological environment. Conclusion The evaluation results are consistent with the field survey results， in order to provide a theoretical basis for the treatment and restoration of mine geological environment in the study area， and also provide a reference for the comprehensive evaluation of mine geological environment in similar areas.
2021, 8(S1): 110-116.
doi: 10.16516/j.gedi.issn2095-8676.2021.S1.018
Abstract:
Introduction The electricity sales company faces the fluctuation of electricity price in the spot market of the wholesale side and the uncertainty of the demand power of the retail side. In order to balance the benefits and risks， it is necessary to determine a reasonable proportion of electricity purchase in the medium and long-term market and the spot market and the time-of-use electricity price for consumers. Method The demand price response curve was used to simulate the contesting of electricity sales companies in the medium and long-term contract market， and a quantitative method of transaction risk loss index based on conditional value at risk （CVaR） was proposed. Result The demand response based on virtual power plant is realized through flexible load and distributed power generation， so as to balance the power deviation and the risk of price fluctuation in the spot market. On this basis， a two-level optimization model considering the power purchase strategy of electricity sales companies in the wholesale side market and the revenue of power selling on the retail side is established， and the crisscross optimization algorithm is used for solving the problem. Conclusion The simulation results show the effectiveness of the method.
