一种适用于复杂工况的接地故障指示仪新型检测算法
|
摘要
接地故障指示仪为配电系统的可靠运行做出了贡献,但是其现有检测算法准确率低,无法满足复杂工况的需求。由于实际应用中互感器的误差、通信信道的噪声和线路参数的差异会导致线路间能量的区分度降低。针对这些问题,分析了高频能量法和直流能量法,基于仿真的结论利用线路参数对高频能量法进行改进,提出一种利用直流能量和改进后高频能量的综合检测方法,并给出了接地故障指示仪系统利用此种方法进行故障定位的工作流程图。最后,利用所提方法进行故障定位并通过蒙特卡洛模拟验证。结果表明,高频能量法和直流法在不同故障初相角下表现出的特性不同。提出的综合检测方法的准确率为91. 8%。
Ground fault indicators contribute to the reliability of distribution system,but the existing detection algorithm has low accuracy and can not meet the needs of complex conditions. Due to the error of the transformer,the noise of the communication channel and the parameters of the line,the differentiation of the energy between the lines will be reduced. The high frequency energy method and the DC energy method were analyzed. Based on the simulation results,the high frequency energy method was improved by using the line parameters. A method using the DC energy and the improved high frequency energy was proposed,and the ground fault indicator system using this method for fault location of work flow chart was given. The results show that the characteristics of the high frequency energy method and the DC energy method are different under the initial phase angle of different faults. The accuracy of the proposed method is 91. 8% by Monte Carlo simulation.
Ground fault indicators contribute to the reliability of distribution system,but the existing detection algorithm has low accuracy and can not meet the needs of complex conditions. Due to the error of the transformer,the noise of the communication channel and the parameters of the line,the differentiation of the energy between the lines will be reduced. The high frequency energy method and the DC energy method were analyzed. Based on the simulation results,the high frequency energy method was improved by using the line parameters. A method using the DC energy and the improved high frequency energy was proposed,and the ground fault indicator system using this method for fault location of work flow chart was given. The results show that the characteristics of the high frequency energy method and the DC energy method are different under the initial phase angle of different faults. The accuracy of the proposed method is 91. 8% by Monte Carlo simulation.
引文
1李庚银.电力系统分析基础[M].北京:机械工业出版社,2015:170Li Gengyin.Basis of power system analysis[M].Beijing:Machinery Industry Press,2015:170
2束洪春,彭仕欣,李斌,等.配电网缆-线混合线路故障选线的可拓融合方法[J].电工技术学报,2008,23(11):146-152Shu Hongchun,Peng Shixin,Li Bin,et al.Fault line detecting approach to hybrid feeders consisting of power cables and overhead lines in distribution network using extenics[J].Transactions of China Electrotechnical Society,2008,23(11):146-152
3柳瑾,阮玉斌,金涛,等.基于模糊理论的配电网多判据融合故障选线方法研究[J].电气技术,2016,17(10):23-30Liu Jin,Ruan Yubin,Jin Tao,et al.Research on multi-criteria fusion strategy of fault line selection in distribution network based on fuzzy theory[J].Electrical Engineering,2016,17(10):23-30
4 Lorenc J,Andruszkiewicz J,Olejnik B,et al.Earth fault detection and isolation system for MV network[C]//Modern Electric Power Systems.Wroclaw,Poland:IEEE,2016:1-7
5 Silva N.Fault detection and location in low voltage grids based on RF-mesh sensor networks[C]//Cired Wrokshop.Finland:Insititute of Engineering and Technology,2016
6 Nejadfardjahromi S,Hajebrahimi A,Rashidinejad M.Fault indicator location in distribution system using Fuzzy clustering-based genetic algorithm[C]//Intelligent System.Iran:IEEE,2014:6802593
7 Vukojevic A,Smith M,Frey P,et al.The business case for smart fault circuit indicators[C]//Transmission and Distribution Conference and Exposition.Chicago,USA:IEEE,2014:1-6
8 Farajollahi M,Fotuhi-Firuzabad M,Safdarian A.Deployment of fault indicator in distribution networks:a MIP-based approach[J].IEEETransactions on Smart Grid,2016,99:1-1
9金涛,褚福亮.基于暂态非工频零序电流的含DG新型配电网的接地选线方法[J].电工技术学报,2015,30(17):96-105Jin Tao,Chu Fuliang.A fault line-selection method in new distribution network with dg based on transient non-power frequency zero sequence current[J].Transactions of China Electrotechnical Society,2015,30(17):96-105
10李福寿.中性点非有效接地电网的运行[M].北京:水利电力出版社,1995Li Fushou.Operation of neutral point non-effective grounded power grid[M].Beijing:China Water&Power Press,1995
2束洪春,彭仕欣,李斌,等.配电网缆-线混合线路故障选线的可拓融合方法[J].电工技术学报,2008,23(11):146-152Shu Hongchun,Peng Shixin,Li Bin,et al.Fault line detecting approach to hybrid feeders consisting of power cables and overhead lines in distribution network using extenics[J].Transactions of China Electrotechnical Society,2008,23(11):146-152
3柳瑾,阮玉斌,金涛,等.基于模糊理论的配电网多判据融合故障选线方法研究[J].电气技术,2016,17(10):23-30Liu Jin,Ruan Yubin,Jin Tao,et al.Research on multi-criteria fusion strategy of fault line selection in distribution network based on fuzzy theory[J].Electrical Engineering,2016,17(10):23-30
4 Lorenc J,Andruszkiewicz J,Olejnik B,et al.Earth fault detection and isolation system for MV network[C]//Modern Electric Power Systems.Wroclaw,Poland:IEEE,2016:1-7
5 Silva N.Fault detection and location in low voltage grids based on RF-mesh sensor networks[C]//Cired Wrokshop.Finland:Insititute of Engineering and Technology,2016
6 Nejadfardjahromi S,Hajebrahimi A,Rashidinejad M.Fault indicator location in distribution system using Fuzzy clustering-based genetic algorithm[C]//Intelligent System.Iran:IEEE,2014:6802593
7 Vukojevic A,Smith M,Frey P,et al.The business case for smart fault circuit indicators[C]//Transmission and Distribution Conference and Exposition.Chicago,USA:IEEE,2014:1-6
8 Farajollahi M,Fotuhi-Firuzabad M,Safdarian A.Deployment of fault indicator in distribution networks:a MIP-based approach[J].IEEETransactions on Smart Grid,2016,99:1-1
9金涛,褚福亮.基于暂态非工频零序电流的含DG新型配电网的接地选线方法[J].电工技术学报,2015,30(17):96-105Jin Tao,Chu Fuliang.A fault line-selection method in new distribution network with dg based on transient non-power frequency zero sequence current[J].Transactions of China Electrotechnical Society,2015,30(17):96-105
10李福寿.中性点非有效接地电网的运行[M].北京:水利电力出版社,1995Li Fushou.Operation of neutral point non-effective grounded power grid[M].Beijing:China Water&Power Press,1995