多时态的三相相地增量电流矢量关系特征及选线应用
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摘要
为提高配电网单相接地选线定位的正确率,通过对小电流接地在多时态三相增量电流的构成和矢量关系特征的分析研究发现:1)反映小电流接地本质特征的分量电流为双负序电流,并总结出其矢量关系特征;2)检验增量电流至少在一个时态内有无双负序电流矢量关系特征,能够确定是否疑似接地线路;3)检验增量电流至少在后暂态有无该特征,能够辨识真伪单相接地;4)可能出现的暂态谐振电流的首半波或非周期分量电流,与工频增量电流在接地相的首半波同极性。据此,设计了在多时态比较三相相地增量电流矢量关系特征的接地选线和防误辨识方法。该方法排除了零序谐振电流的影响,广泛适用于各类型配电网的高、中、低阻接地选线。经多方案仿真和模拟实验验证,该方法适用有效。
In order to improve accuracy of phase-earth grounding and positioning of distribution network, through analysis of main components and vector relationship characteristics of the incremental current in the three-phase with small current grounding, it was found that, 1) the essential characteristics of small current grounding are double negative sequence current and its vector relation characteristics are summarized; 2) checking whether the incremental current has the characteristics of double negative sequence current vector in at least one time-state can determine the suspected ground circuit; 3) verifying whether the incremental current has the characteristics at least in the post-transient states can identify the single-phase grounding true or false; 4) the first half or non-periodic component current of the transient resonant current that may occur is of the same polarity as the first half of the grounding phase. Based on these, a method of grounding line selection and error prevention identification is designed by comparing the vector relation characteristics of three-phase phase-earth increment current. The method eliminates the influence of zero-sequence resonant current, making it suitable for groundin g monitorin g of high-, medium-, and low-resistance transition resistors of all types. Results of simulation and experiments have all confirmed effectiveness of the proposed method.
In order to improve accuracy of phase-earth grounding and positioning of distribution network, through analysis of main components and vector relationship characteristics of the incremental current in the three-phase with small current grounding, it was found that, 1) the essential characteristics of small current grounding are double negative sequence current and its vector relation characteristics are summarized; 2) checking whether the incremental current has the characteristics of double negative sequence current vector in at least one time-state can determine the suspected ground circuit; 3) verifying whether the incremental current has the characteristics at least in the post-transient states can identify the single-phase grounding true or false; 4) the first half or non-periodic component current of the transient resonant current that may occur is of the same polarity as the first half of the grounding phase. Based on these, a method of grounding line selection and error prevention identification is designed by comparing the vector relation characteristics of three-phase phase-earth increment current. The method eliminates the influence of zero-sequence resonant current, making it suitable for groundin g monitorin g of high-, medium-, and low-resistance transition resistors of all types. Results of simulation and experiments have all confirmed effectiveness of the proposed method.
引文
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[15]韩迎春,童晓阳.利用时空电气量基于灰色关联度的电网故障诊断[J].电网技术,2017,41(2):581-587.Han Yingchun,Tong Xiaoyang.The power system fault diagnosis method based on gray relational degree using spacetime electric quantity[J].Power System Technology,2017,41(2):581-587(in Chinese).
[16]贾学涵,杨东升,郑薇,等.多因素分级Petri网配电故障诊断方法[J].电网技术,2017,41(3):1015-1021.Jia Xuehan,Yang Dongsheng,Zheng Wei,et al.Distribution network fault diagnosis method based on multi-factor hierarchical petri net[J].Power System Technology,2017,41(3):1015-1021(in Chinese).
[17]郑涛,王可坛,刘校销,等.可消除过渡电阻影响的单相接地距离保护研究[J].电网技术,2017,41(12):4045-4053.Zheng Tao,Wang Ketan,Liu Xiaoxiao,et al.Research on single phase grounding distance protection against transition resistance[J].Power System Technology,2017,81(12):4045-4053(in Chinese).
[18]马伟,裘愉涛,丁冬,等.基于阻尼最小二乘法的单相接地故障定位方案[J].电网技术,2018,42(9):3049-3054.Ma Wei,Qiu Yutao,Ding Dong,et al.Single-phase grounding fault location scheme based on levenberg-marquarat algorithm[J].Power System Technology,2018,42(9):3049-3054(in Chinese).
[19]孙永超,邰能灵,郑晓冬.含分布式电源的配电网单相接地故障区段定位新方法[J].电力科学与技术学报,2016,31(3):73-80.Sun Yongchao,Tai Nengling,Zheng Xiaodong.New method for single-phase earth fault location of distribution network with distributed power supply[J].Journal of Electric Power Science and Technology,2016,31(3):73-80(in Chinese).
[20]贾清泉,王振宇,王宁,等.基于参数辨识的消弧线圈接地电网单相接地故障测距方法[J].电工技术学报,2016,31(23):77-85.Jia Qingquan,Wang Zhenyu,Wang Ning,et al.Study on singlephase-to-ground fault location method for arc-suppression coil grounding grid based on parameter identification[J].Transactions of China Electrotechnical Society,2016,31(23):77-85(in Chinese).
[21]Majidi M,Etezadi-Amoli M,Fadali M S.A novel method for single and simultaneous fault location in distribution networks[J].IEEETransactions on Power Systems,2015,30(6):3368-3376.
[22]Li B.Technology of fault line selection for single-phase-to-earth fault in small current grounding system[J].Nonlinear Dynamics,2012,67(3):2111-2122.
[23]Saleh S A,Scaplen B,Rahman M A.A new implementation method of wavelet-packet-transform differential protection for power transformers[J].IEEE Transactions on Industry Applications,2011,47(2):1003-1012.
[24]Dong X,Wang J,Shi S,et al.Traveling wave based single-phaseto-ground protection method for power distribution system[J].CSEEJournal of Power&Energy Systems,2015,1(2):75-82.
[2]薛永端,陈羽,徐丙垠,等.利用暂态特征的新型小电流接地故障监测系统[J].电力系统自动化,2004,28(24):83-87.Xue Yongrui,Chen Yu,Xu Bingyin,et al.Transient current equivalent circuit and transient analysis of small current grounding fault in arc suppression coil grounding system[J].Automation of Electric Power Systems,2004,28(24):83-87(in Chinese).
[3]宋国宾,李广,于叶云,等.基于相电流突变量的配电网单相接地故障区段定位[J].电力系统自动化,2011,35(1):84-89.Song Guobin,Li Guang,Yu Yeyun,et al.Location of single phase to ground faults in distribution network based on phase current impulse[J].Automation of Electric Power Systems,2011,35(1):84-89(in Chinese).
[4]常仲学,宋国宾,黄炜,等.基于相电压电流突变量特征的配电网单相接地故障区段定位方法[J].电网技术,2017,41(7):2363-2370.Chang Zhongxue,Song Guobing,Huang Wei,et al.Phase voltage and current fault components based fault segment location method under single-phase earth fault in distribution network[J].Power System Technology,2017,41(7):2363-2370(in Chinese).
[5]吴乐鹏,黄纯,林达斌,等.基于暂态小波能量的小电流接地故障选线新方法[J].电力自动化设备,2013,33(5):70-75.Wu Lepeng,Huang Chun,Lin Dabin,et al.New method of fault line selection for small current grounding based on transient wavelet energy[J].Electric Power Automation Equipment,2013,33(5):70-75(in Chinese).
[6]方毅,薛永端,宋华茂,等.谐振接地系统高阻接地故障暂态能量分析与选线[J].中国电机工程学报,2018,38(19):5636-5645,5921.Fang Yi,Xue Yongduan,Song Huamao,et al.Transient energy analysis and faulty feeder identification method of high impedance fault in the resonant grounding system[J].Proceedings of the CSEE,2018,38(19):5636-5645,5921(in Chinese).
[7]山东电力研究院.小电流接地故障选线及定位技术[M].北京:中国电力出版社,2018:26-33.
[8]王锡凡.现代电力系统分析[M].北京:科学出版社,2018:59-65.
[9]杨奇逊,黄少峰.微型机继电保护基础[M].北京:中国电力出版社,2013:103-110.
[10]陈帅.数字信号处理与DSP实现技术[M].北京:人民邮电出版社,2015:64-70.
[11]张淑清,赵朋程,陈颖,等.基于EEMD和关联维数的小电流接地故障选线[J].计量学报,2016,37(3):300-305.Zhang Shuqing,Zhao Pengcheng,Chen Ying,et al.Small current grounding fault line based on EEMD and correlation dimension[J].Acta Metrologica Sinica,2016,37(3):300-305(in Chinese).
[12]梁睿,杨学君,薛雪,等.零序分布参数的单相接地故障精确定位研究[J].电工技术学报,2015,30(12):472-479.Liang Rui,Yang Xuejun,Xue Xue,et al.Research on accurate location of single phase earth fault with zero sequence distribution parameter[J].Transactions of China Electrotechnical Society,2015,30(12):472-479(in Chinese).
[13]梁睿,杨学君,彭楠,等.基于广域零序分布电压特征的小电流接地选线方法[J].电网技术,2016,40(10):3236-3242.Liang Rui,Yang Xuejun,Peng Nan,et al.Method of small current grounding selection based on wide-area zero sequence distribution voltage characteristics[J].Power System Technology,2016,40(10):3236-3242(in Chinese).
[14]陈博博,屈卫锋,杨宏宇,等.小电流接地系统单相接地综合电弧模型与选线方法的研究[J].电力系统保护与控制,2016,44(16):1-7.Chen Bobo,Qu Weifeng,Yang Hongyu,et al.Study on single-phase grounded integrated arc model and line selection method for small current grounding system[J].Power System Protection and Control,2016,44(16):1-7(in Chinese).
[15]韩迎春,童晓阳.利用时空电气量基于灰色关联度的电网故障诊断[J].电网技术,2017,41(2):581-587.Han Yingchun,Tong Xiaoyang.The power system fault diagnosis method based on gray relational degree using spacetime electric quantity[J].Power System Technology,2017,41(2):581-587(in Chinese).
[16]贾学涵,杨东升,郑薇,等.多因素分级Petri网配电故障诊断方法[J].电网技术,2017,41(3):1015-1021.Jia Xuehan,Yang Dongsheng,Zheng Wei,et al.Distribution network fault diagnosis method based on multi-factor hierarchical petri net[J].Power System Technology,2017,41(3):1015-1021(in Chinese).
[17]郑涛,王可坛,刘校销,等.可消除过渡电阻影响的单相接地距离保护研究[J].电网技术,2017,41(12):4045-4053.Zheng Tao,Wang Ketan,Liu Xiaoxiao,et al.Research on single phase grounding distance protection against transition resistance[J].Power System Technology,2017,81(12):4045-4053(in Chinese).
[18]马伟,裘愉涛,丁冬,等.基于阻尼最小二乘法的单相接地故障定位方案[J].电网技术,2018,42(9):3049-3054.Ma Wei,Qiu Yutao,Ding Dong,et al.Single-phase grounding fault location scheme based on levenberg-marquarat algorithm[J].Power System Technology,2018,42(9):3049-3054(in Chinese).
[19]孙永超,邰能灵,郑晓冬.含分布式电源的配电网单相接地故障区段定位新方法[J].电力科学与技术学报,2016,31(3):73-80.Sun Yongchao,Tai Nengling,Zheng Xiaodong.New method for single-phase earth fault location of distribution network with distributed power supply[J].Journal of Electric Power Science and Technology,2016,31(3):73-80(in Chinese).
[20]贾清泉,王振宇,王宁,等.基于参数辨识的消弧线圈接地电网单相接地故障测距方法[J].电工技术学报,2016,31(23):77-85.Jia Qingquan,Wang Zhenyu,Wang Ning,et al.Study on singlephase-to-ground fault location method for arc-suppression coil grounding grid based on parameter identification[J].Transactions of China Electrotechnical Society,2016,31(23):77-85(in Chinese).
[21]Majidi M,Etezadi-Amoli M,Fadali M S.A novel method for single and simultaneous fault location in distribution networks[J].IEEETransactions on Power Systems,2015,30(6):3368-3376.
[22]Li B.Technology of fault line selection for single-phase-to-earth fault in small current grounding system[J].Nonlinear Dynamics,2012,67(3):2111-2122.
[23]Saleh S A,Scaplen B,Rahman M A.A new implementation method of wavelet-packet-transform differential protection for power transformers[J].IEEE Transactions on Industry Applications,2011,47(2):1003-1012.
[24]Dong X,Wang J,Shi S,et al.Traveling wave based single-phaseto-ground protection method for power distribution system[J].CSEEJournal of Power&Energy Systems,2015,1(2):75-82.