Distribution network operation trend prediction is a key technology to analyze the network security operation status and potential hidden dangers of distribution side dynamically, how to accurately depict distribution network operation status and trend change is an important work to ensure the safe and stable operation of distribution network. In this paper, a trend prediction strategy for distribution network operation is proposed. First, fusion integration Ensemble Empirical Mode Decomposition (EEMD) and Variational Mode Decom (VMD) establish a secondary modal decomposition model of distribution network operating parameters, extract relatively stable subsequents and trend sequences, in order to reduce the impact of disordered components in high frequency sequences on predictive accuracy; Moth Flame Optimization (MFO) optimizes the LSTM parameters and uses the optimized Long-term Memory Networks (LSTM) to predict the subsethics of the operating parameters to further improve the accuracy of the distribution network operation trend prediction, and finally, the validity of the method proposed in this paper is verified in the actual power grid in a province of China. This method can accurately depict the changing trend of distribution network operation and perceive the security risks that distribution network may awareness.
{"title":"Prediction of Distribution Network Operation Trend Based on the Secondary Modal Decomposition and LSTM-MFO Algorithm","authors":"Tianzhong Zhang, Jinfeng Zhang, Huan Xue, Chengjin Wang, Wenzhi Han, Kunpeng Li","doi":"10.1109/ACPEE51499.2021.9436870","DOIUrl":"https://doi.org/10.1109/ACPEE51499.2021.9436870","url":null,"abstract":"Distribution network operation trend prediction is a key technology to analyze the network security operation status and potential hidden dangers of distribution side dynamically, how to accurately depict distribution network operation status and trend change is an important work to ensure the safe and stable operation of distribution network. In this paper, a trend prediction strategy for distribution network operation is proposed. First, fusion integration Ensemble Empirical Mode Decomposition (EEMD) and Variational Mode Decom (VMD) establish a secondary modal decomposition model of distribution network operating parameters, extract relatively stable subsequents and trend sequences, in order to reduce the impact of disordered components in high frequency sequences on predictive accuracy; Moth Flame Optimization (MFO) optimizes the LSTM parameters and uses the optimized Long-term Memory Networks (LSTM) to predict the subsethics of the operating parameters to further improve the accuracy of the distribution network operation trend prediction, and finally, the validity of the method proposed in this paper is verified in the actual power grid in a province of China. This method can accurately depict the changing trend of distribution network operation and perceive the security risks that distribution network may awareness.","PeriodicalId":127882,"journal":{"name":"2021 6th Asia Conference on Power and Electrical Engineering (ACPEE)","volume":"49 5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131862324","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-04-01DOI: 10.1109/ACPEE51499.2021.9436850
C. Hua, K. Gunawardane, T. Lie
One major challenge in the context of the expanding research and developments of DC power and related technologies is the lack of well-developed and globally accepted standards for DC power distribution and equipment. This review investigates the fast-developing DC standards across the globe in the various stages of DC microgrids as well as their adaptability to New Zealand context to facilitate the future implementation scenarios of power electronic converters and other enabling technologies of Future Architecture of the Power System Network. A comprehensive literature survey is carried out collecting the latest relevant standards and related implementation scenarios for conveyance by DC at low and medium voltages for domestic/commercial and industrial customers. Also, recommendations for DC standards to follow in New Zealand context for the Future Architecture of the Network are provided in this paper.
{"title":"Investigation of Progressing Low and Medium Voltage DC Standards to Acquire the Implementation Scenarios for Domestic/Commercial and Industrial Converters and Enabling Technologies","authors":"C. Hua, K. Gunawardane, T. Lie","doi":"10.1109/ACPEE51499.2021.9436850","DOIUrl":"https://doi.org/10.1109/ACPEE51499.2021.9436850","url":null,"abstract":"One major challenge in the context of the expanding research and developments of DC power and related technologies is the lack of well-developed and globally accepted standards for DC power distribution and equipment. This review investigates the fast-developing DC standards across the globe in the various stages of DC microgrids as well as their adaptability to New Zealand context to facilitate the future implementation scenarios of power electronic converters and other enabling technologies of Future Architecture of the Power System Network. A comprehensive literature survey is carried out collecting the latest relevant standards and related implementation scenarios for conveyance by DC at low and medium voltages for domestic/commercial and industrial customers. Also, recommendations for DC standards to follow in New Zealand context for the Future Architecture of the Network are provided in this paper.","PeriodicalId":127882,"journal":{"name":"2021 6th Asia Conference on Power and Electrical Engineering (ACPEE)","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127420204","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-04-01DOI: 10.1109/ACPEE51499.2021.9436848
Xinyu Qiu, Qi Zhao, Yi Wang, Jiang Tian, Hongen Ding, Ji Zhang, Haifeng Zhao
Load transfer technology plays a crucial role in regional power grid because it can significantly reduce the loss caused by fault and improve the reliability of power supply. Firstly, this paper introduces the typical connection mode of Jiangsu power grid, and makes a brief analysis of its operation mode. Secondly, the power failure range of each equipment in the station is analyzed to determine the search direction of the transfer path. Finally, combined with the expert system theory, this paper studies the transformer fault, bus fault and line fault respectively to determine effective load transfer strategy and give a load transfer plan that suitable for the regional power grid. The field operation shows that the method proposed in this paper is feasible, which can effectively transfer the power loss load caused by equipment fault in the power grid, and can ensure the safe and stable operation of the power grid.
{"title":"Load Transfer Analysis of Regional Power Grid Based on Expert System Theory","authors":"Xinyu Qiu, Qi Zhao, Yi Wang, Jiang Tian, Hongen Ding, Ji Zhang, Haifeng Zhao","doi":"10.1109/ACPEE51499.2021.9436848","DOIUrl":"https://doi.org/10.1109/ACPEE51499.2021.9436848","url":null,"abstract":"Load transfer technology plays a crucial role in regional power grid because it can significantly reduce the loss caused by fault and improve the reliability of power supply. Firstly, this paper introduces the typical connection mode of Jiangsu power grid, and makes a brief analysis of its operation mode. Secondly, the power failure range of each equipment in the station is analyzed to determine the search direction of the transfer path. Finally, combined with the expert system theory, this paper studies the transformer fault, bus fault and line fault respectively to determine effective load transfer strategy and give a load transfer plan that suitable for the regional power grid. The field operation shows that the method proposed in this paper is feasible, which can effectively transfer the power loss load caused by equipment fault in the power grid, and can ensure the safe and stable operation of the power grid.","PeriodicalId":127882,"journal":{"name":"2021 6th Asia Conference on Power and Electrical Engineering (ACPEE)","volume":"107 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115449287","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The installed capacity of wind turbine is gradually increasing, and the cost of operation and maintenance of wind turbine is also gradually increasing. In order to reduce the cost of wind turbine operation and maintenance, using SCADA data for fault early warning and condition monitoring has become one of the hot research directions in recent years. The SCADA data of wind turbine include abandoned wind data, fault data, shutdown data and so on, these data can not correctly reflect the operating status of the unit, in order to improve the accuracy of early warning and facilitate the follow-up research work, it is necessary to preprocess the data. For this reason, this paper proposes a method of combining dispersion analysis and bin algorithm to preprocess the operation data of wind turbine. First of all, the principles of bin algorithm and dispersion analysis method are introduced, and then the improved bin algorithm is used to fit the wind speed-power curve. Finally, based on the power curve, the data are preprocessed by the method of dispersion analysis. The experimental results show that the combination of dispersion analysis and bin algorithm can effectively remove the abnormal data in SCADA data.
{"title":"Research on SCADA data preprocessing method of Wind Turbine","authors":"Fuyu Qiao, Yongguang Ma, Liangyu Ma, Sihan Chen, Hao Yang, Pingyan Ma","doi":"10.1109/ACPEE51499.2021.9437009","DOIUrl":"https://doi.org/10.1109/ACPEE51499.2021.9437009","url":null,"abstract":"The installed capacity of wind turbine is gradually increasing, and the cost of operation and maintenance of wind turbine is also gradually increasing. In order to reduce the cost of wind turbine operation and maintenance, using SCADA data for fault early warning and condition monitoring has become one of the hot research directions in recent years. The SCADA data of wind turbine include abandoned wind data, fault data, shutdown data and so on, these data can not correctly reflect the operating status of the unit, in order to improve the accuracy of early warning and facilitate the follow-up research work, it is necessary to preprocess the data. For this reason, this paper proposes a method of combining dispersion analysis and bin algorithm to preprocess the operation data of wind turbine. First of all, the principles of bin algorithm and dispersion analysis method are introduced, and then the improved bin algorithm is used to fit the wind speed-power curve. Finally, based on the power curve, the data are preprocessed by the method of dispersion analysis. The experimental results show that the combination of dispersion analysis and bin algorithm can effectively remove the abnormal data in SCADA data.","PeriodicalId":127882,"journal":{"name":"2021 6th Asia Conference on Power and Electrical Engineering (ACPEE)","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115469973","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
With the gradual advancement of the "coal-to-electricity" project, a large number of electric heating equipment are connected to the rural power distribution network, and a new typical daily peak load in winter appears, which brings challenges to the safe and stable operation of the power distribution network. Therefore, this paper proposes a load forecasting method for rural distribution network connected to electric heating cluster and its impact on distribution network. First, a load forecasting model for rural heating with electricity is built; then, peak-valley correlation, network loss, and voltage offset are proposed to evaluate electricity the influence of heating cluster load on rural distribution network; finally, the effectiveness of the electric heating cluster load forecasting method proposed in this paper is verified by a typical example, and the impact of the electric heating access on the distribution network is evaluated by the proposed indicators.
{"title":"Load Prediction of Electric Heating Cluster and Its Influence on Rural Distribution Network","authors":"Shupeng Li, Xianxu Huo, X. Xi, Jiancheng Yu, Yaqing Zhang, Jiarui Zhang","doi":"10.1109/ACPEE51499.2021.9436881","DOIUrl":"https://doi.org/10.1109/ACPEE51499.2021.9436881","url":null,"abstract":"With the gradual advancement of the \"coal-to-electricity\" project, a large number of electric heating equipment are connected to the rural power distribution network, and a new typical daily peak load in winter appears, which brings challenges to the safe and stable operation of the power distribution network. Therefore, this paper proposes a load forecasting method for rural distribution network connected to electric heating cluster and its impact on distribution network. First, a load forecasting model for rural heating with electricity is built; then, peak-valley correlation, network loss, and voltage offset are proposed to evaluate electricity the influence of heating cluster load on rural distribution network; finally, the effectiveness of the electric heating cluster load forecasting method proposed in this paper is verified by a typical example, and the impact of the electric heating access on the distribution network is evaluated by the proposed indicators.","PeriodicalId":127882,"journal":{"name":"2021 6th Asia Conference on Power and Electrical Engineering (ACPEE)","volume":"190 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124222307","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-04-01DOI: 10.1109/ACPEE51499.2021.9436958
S. Huang, Zhaoyun Zhang, L. Yanxin, Li Hui, Qitong Wang, Zhi-Li Zhang, Yang Zhao
Unmanned aerial vehicle (UAV) inspection is the most popular inspection method in power transmission line inspection. UAV inspection mainly obtains the inspection image of power transmission equipment through machine vision and detects it. Image classification technology is mainly used for the identification of power transmission equipment, which can be used for fault diagnosis after sorting out the equipment. In order to accurately classify transmission equipment images, a classification method based on ensemble learning is proposed. This paper classifies and identifies four kinds of equipment in transmission line, including insulator, damper, interval rods, and corona ring. The experimental results show that the efficiency of the proposed ensemble learning method is better than that of single machine learning classifier.
{"title":"Transmission equipment image recognition based on Ensemble Learning","authors":"S. Huang, Zhaoyun Zhang, L. Yanxin, Li Hui, Qitong Wang, Zhi-Li Zhang, Yang Zhao","doi":"10.1109/ACPEE51499.2021.9436958","DOIUrl":"https://doi.org/10.1109/ACPEE51499.2021.9436958","url":null,"abstract":"Unmanned aerial vehicle (UAV) inspection is the most popular inspection method in power transmission line inspection. UAV inspection mainly obtains the inspection image of power transmission equipment through machine vision and detects it. Image classification technology is mainly used for the identification of power transmission equipment, which can be used for fault diagnosis after sorting out the equipment. In order to accurately classify transmission equipment images, a classification method based on ensemble learning is proposed. This paper classifies and identifies four kinds of equipment in transmission line, including insulator, damper, interval rods, and corona ring. The experimental results show that the efficiency of the proposed ensemble learning method is better than that of single machine learning classifier.","PeriodicalId":127882,"journal":{"name":"2021 6th Asia Conference on Power and Electrical Engineering (ACPEE)","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122083836","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-04-01DOI: 10.1109/ACPEE51499.2021.9437081
X. Luo, Haiting Shan, Luliang Zhang, Mengshi Li
A method used to locate the fault in multi-branch network combining graph theory and traveling waves is proposed. According to the transmission path matrix generated by the Dijkstra algorithm, two appropriate estimation criteria are used to determine the faulty line or the faulty lateral branch, and the optimal traveling wave detectors are selected to locate the fault accurately. The single-end traveling wave method is used to calculate the fault distance of the lateral branches, while the double-end traveling wave method is used to calculate the fault distance when the fault occurs on the main lines. The simulation studies are carried out using PSCAD, and the experimental results verified the effectiveness of the proposed method, which can locate the fault accurately.
{"title":"Fault Location on Multi-Branch Network Using Traveling Wave and Graph Theory","authors":"X. Luo, Haiting Shan, Luliang Zhang, Mengshi Li","doi":"10.1109/ACPEE51499.2021.9437081","DOIUrl":"https://doi.org/10.1109/ACPEE51499.2021.9437081","url":null,"abstract":"A method used to locate the fault in multi-branch network combining graph theory and traveling waves is proposed. According to the transmission path matrix generated by the Dijkstra algorithm, two appropriate estimation criteria are used to determine the faulty line or the faulty lateral branch, and the optimal traveling wave detectors are selected to locate the fault accurately. The single-end traveling wave method is used to calculate the fault distance of the lateral branches, while the double-end traveling wave method is used to calculate the fault distance when the fault occurs on the main lines. The simulation studies are carried out using PSCAD, and the experimental results verified the effectiveness of the proposed method, which can locate the fault accurately.","PeriodicalId":127882,"journal":{"name":"2021 6th Asia Conference on Power and Electrical Engineering (ACPEE)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129427024","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-04-01DOI: 10.1109/ACPEE51499.2021.9436994
Xuan Li, Ying Xu, He Zhang, Zijian Gao
Zhangbei Project is the first VSC-HVDC grid in the world. Also, the project has the highest voltage and biggest capacity. Control and protection system directly determines the operation characteristics of VSC-HVDC grid. It is greatly significant for improving dc system performance and ensuring the safety of dc grid. Special requirement of VSC-HVDC grid operation for control and protection system is studied, and control and protection system architecture and function configuration for Zhangbei Project are presented. Firstly, considering characteristics of dc grid, several key control functions are systematically put forward, including start-stop control of converter and grid, etc. Corresponding analysis and research are given. Secondly, protection zoning and key protection functions of dc grid are systematically proposed. Pole protection and valve protective are respectively studied. Complete technical ideas and design method of control and protection system in Zhangbei VSC-HVDC grid is presented. The research results provide technical basis for project control and protection scheme.
{"title":"Control and Protection System Design of Zhangbei VSC-HVDC grid","authors":"Xuan Li, Ying Xu, He Zhang, Zijian Gao","doi":"10.1109/ACPEE51499.2021.9436994","DOIUrl":"https://doi.org/10.1109/ACPEE51499.2021.9436994","url":null,"abstract":"Zhangbei Project is the first VSC-HVDC grid in the world. Also, the project has the highest voltage and biggest capacity. Control and protection system directly determines the operation characteristics of VSC-HVDC grid. It is greatly significant for improving dc system performance and ensuring the safety of dc grid. Special requirement of VSC-HVDC grid operation for control and protection system is studied, and control and protection system architecture and function configuration for Zhangbei Project are presented. Firstly, considering characteristics of dc grid, several key control functions are systematically put forward, including start-stop control of converter and grid, etc. Corresponding analysis and research are given. Secondly, protection zoning and key protection functions of dc grid are systematically proposed. Pole protection and valve protective are respectively studied. Complete technical ideas and design method of control and protection system in Zhangbei VSC-HVDC grid is presented. The research results provide technical basis for project control and protection scheme.","PeriodicalId":127882,"journal":{"name":"2021 6th Asia Conference on Power and Electrical Engineering (ACPEE)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129509476","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-04-01DOI: 10.1109/ACPEE51499.2021.9436889
Jingrui Liu, G. Zou
The multi-terminal high voltage direct current (MTDC) grid based on modular multilevel converter (MMC) has been an important part of the power system, but due to its unique structure which is low-impedance, the fault current increases very fast and seriously threatens the safety of the equipment. So protection methods are needed to detect and discriminate the fault line, so as to ensure the reliability of the power system. This paper studies the fault characteristics of multi-terminal flexible DC transmission system under various fault scenarios, according to theoretical analysis, when an internal fault occurs, the fault current direction on both ends of the fault line is the same; however, the direction of the fault current on both ends of the healthy line is opposite. Then a current-slope-based fault line selection method can be proposed. By comparing the slope of fault current at both ends of the line, the fault line can be effectively identified, which can be used in the flexible DC transmission systems as a backup protection. Finally, the simulation model of Zhangbei four-terminal flexible DC grid is established by using PSCAD/EMTDC software, and the simulation is carried out to verify the effectiveness of the proposed protection principle.
{"title":"A Current-Slope-Based DC line Protection for MMC-MTDC Grid","authors":"Jingrui Liu, G. Zou","doi":"10.1109/ACPEE51499.2021.9436889","DOIUrl":"https://doi.org/10.1109/ACPEE51499.2021.9436889","url":null,"abstract":"The multi-terminal high voltage direct current (MTDC) grid based on modular multilevel converter (MMC) has been an important part of the power system, but due to its unique structure which is low-impedance, the fault current increases very fast and seriously threatens the safety of the equipment. So protection methods are needed to detect and discriminate the fault line, so as to ensure the reliability of the power system. This paper studies the fault characteristics of multi-terminal flexible DC transmission system under various fault scenarios, according to theoretical analysis, when an internal fault occurs, the fault current direction on both ends of the fault line is the same; however, the direction of the fault current on both ends of the healthy line is opposite. Then a current-slope-based fault line selection method can be proposed. By comparing the slope of fault current at both ends of the line, the fault line can be effectively identified, which can be used in the flexible DC transmission systems as a backup protection. Finally, the simulation model of Zhangbei four-terminal flexible DC grid is established by using PSCAD/EMTDC software, and the simulation is carried out to verify the effectiveness of the proposed protection principle.","PeriodicalId":127882,"journal":{"name":"2021 6th Asia Conference on Power and Electrical Engineering (ACPEE)","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129560795","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-04-01DOI: 10.1109/ACPEE51499.2021.9437127
Xuefang Tong, Xiaohui Dong, Bo Tan
In order to master the safety of the GIL shell grounding system of the 1000kV AC UHV GIL tunnel project and support the design and construction of the project, a shell grounding system model consisting of the main grounding grid of connection stations on both sides, the tower grounding grid of overhead ground wires on both sides and the tunnel grounding grid is established. The GIL current and potential distribution under normal operation and short-circuit fault are calculated, and the influence and setting of grounding poles and three-phase connection poles are analyzed. The results show that: under normal operation, the current of connection poles and grounding poles along the GIL presents a U-shaped distribution. In case of short-circuit fault, besides the two ends, the current of the connection poles and grounding poles near the fault point also presents a peak, which can reach hundreds of amperes; and the distribution of potential and potential difference along the GIL also presents a similar U-shaped feature. The spacing of grounding poles can be set within 300m, which can ensure that the potential difference is within the safety limit. The copper bar of 50mm×5mm can be selected for both the grounding pole and the intermediate connecting pole, and the conductor with larger cross section is needed for the connection pole at both ends due to the long-term passing current close to the rated value.
{"title":"Analysis of Current and Potential Characteristics of UHVAC GIL Tunnel Project","authors":"Xuefang Tong, Xiaohui Dong, Bo Tan","doi":"10.1109/ACPEE51499.2021.9437127","DOIUrl":"https://doi.org/10.1109/ACPEE51499.2021.9437127","url":null,"abstract":"In order to master the safety of the GIL shell grounding system of the 1000kV AC UHV GIL tunnel project and support the design and construction of the project, a shell grounding system model consisting of the main grounding grid of connection stations on both sides, the tower grounding grid of overhead ground wires on both sides and the tunnel grounding grid is established. The GIL current and potential distribution under normal operation and short-circuit fault are calculated, and the influence and setting of grounding poles and three-phase connection poles are analyzed. The results show that: under normal operation, the current of connection poles and grounding poles along the GIL presents a U-shaped distribution. In case of short-circuit fault, besides the two ends, the current of the connection poles and grounding poles near the fault point also presents a peak, which can reach hundreds of amperes; and the distribution of potential and potential difference along the GIL also presents a similar U-shaped feature. The spacing of grounding poles can be set within 300m, which can ensure that the potential difference is within the safety limit. The copper bar of 50mm×5mm can be selected for both the grounding pole and the intermediate connecting pole, and the conductor with larger cross section is needed for the connection pole at both ends due to the long-term passing current close to the rated value.","PeriodicalId":127882,"journal":{"name":"2021 6th Asia Conference on Power and Electrical Engineering (ACPEE)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130182658","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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