Abstract：The distribution of each phase short-circuit current can be changed by the variation of the distributed generation capacity when the single phase ground fault occurs in the distribution network.But it cannot change the characteristics of the zero-sequence current in the head of each line,i.e.the sum of the zero-sequence currents in the non-fault lines equals the head line zero-sequence current in the fault line but they have the inverse direction for the non-power frequency zero-sequence currents.This feature can be used as a fault line selection criterion.This paper proposes a novel method using Hilbert-Huang transform algorithm to extract the non-power frequency component of the zero sequence current in each line,and calculates their energy weighting coefficient.Then the digital notch filter is used to extract the 5th harmonic current of the zero sequence current.It can be concluded that:(1) the fault occurs in the bus if the direction of the 5th harmonic current is same;and (2) when one line has the largest energy weight coefficient and its direction of the 5th harmonic current is different from others,the fault occurs in the line.Through simulations,the proposed method is proved to be able to select the fault line accurately and reliably in the difficult cases,i.e.the small angle fault,the high-impedance ground fault,and the fault in the end of line and etc.,with high accuracy and reliability.
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): 96-105.
Jin Tao Chu Fuliang. A Fault Line-Selection Method in New Distribution Network with DG Based on Transient Non-power Frequency Zero Sequence Current. Transactions of China Electrotechnical Society, 2015, 30(17): 96-105.
[1] 王成山,武震,李鹏.微网关键技术研究[J].电工技术学报,2014,29(2):1-12. Wang Chengshan,Wu Zhen,Li Peng.Research on key technologies of micro grid[J].Transactions of China Electrotechnical Society,2014,29(2):1-12. [2] 郭谋发,刘世丹,杨耿杰.利用时频谱相似度识别的配电线路接地选线方法[J].中国电机工程学报,2013,22(19):183-190. Guo Moufa,Liu Shidan,Yang Gengjie.A novel approach to detect fault lines in distribution network using similarity recognition based on time-frequency spectrum[J].Proceedings of the CSEE,2013,22(19):183-190. [3] 郭谋发,高源,杨耿杰.谐振接地系统暂态波形差异性识别法接地选线[J].电力自动化设备,2014,34(5):59-66. Guo Moufa,Gao Yuan,Yang Gengjie.Faulty line detection based on transient waveform difference recognition for resonant earthed system[J].Electric Power Automation Equipment,2014,34(5):59-66. [4] 束洪春,赵文渊,彭仕欣.配电网缆-线混合线路故障选线的HHT检测方法[J].电力自动化设备,2009,29(5):4-9. Shu Hongchun,Zhao Wenyuan,Peng Shixin.Faulty line selection based on HHT detection for hybrid distribution network[J].Electric Power Automation Equipment,2009,29(5):4-9. [5] 康忠健,李丹丹,刘晓林.应用非工频暂态量的配电网故障选线方法[J].电力自动化设备,2011,31(4):1-6. Kang Zhongjian,Li Dandan,Liu Xiaolin.Faulty line selection with non-power frequency transient components of distribution network[J].Electric Power Automation Equipment,2011,31(4):1-6. [6] 李天云,王飞,祝磊,等.基于固有模态能量熵的配电网单相接地故障选线新方法[J].电网技术,2008,32(S2):128-132. Li Tianyun,Wang Fei,Zhu Lei,et al.A new method of distribution network single-phase ground fault line selection based on the intrinsic mode energy entropy[J].Power System Technology,2008,32(S2):128-132. [7] 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.Faulty line selection based on transient wavelet energy for non-solid-earthed network[J].Electric Power Automation Equipment,2013,33(5):70-75. [8] 郭谋发,林妙玉,杨耿杰.谐振接地系统暂稳态信息智能融合选线方法[J].电力系统保护与控制,2013,41(7):60-66. Guo Moufa,Lin Miaoyu,Yang Gengjie.The transient and steady-state information fusion method for single phase grounding line detection in resonant grounding system[J].Power System Protection and Control,2013,41(7):60-66. [9] 郭谋发,王鹏,杨耿杰.基于HHT和SVM的谐振接地系统故障选线新方法[J].电工电能新技术,2014,33(9):68-73. Guo Moufa,Wang Peng,Yang Gengjie.New approach to detect fault line in resonant grounded system based on HHT and SVM[J].Advanced Technology of Electrical Engineering and Energy,2014,33(9):68-73. [10]马亚辉,李欣然,徐振华,等.一种逆变并网型分布式电源统一模型[J].电工技术学报,2013,28(9):145-154. Ma Yahui,Li Xinran,Xu Zhenhua,et al.A unified model of grid-connected distributed generation through inverters[J].Transactions of China Electrotechnical Society,2013,28(9):145-154. [11]潘国清,曾德辉,王钢,等.含PQ控制逆变型分布式电源的配电网故障分析方法[J].中国电机工程学报,2014,34(4):555-561. Pan Guoqing,Zeng Dehui,Wang Gang,et al.Fault analysis on distribution network with inverter interfaced distributed generations based on PQ control strategy[J].Proceedings of the CSEE,2014,34(4):555-561. [12]吴争荣,王钢,李海锋,等.含分布式电源配电网的相间短路故障分析[J].中国电机工程学报,2013,33(1):130-136. Wu Zhengrong,Wang Gang,Li Haifeng,et al.Analysis on the distribution network with distributed generators under phase-to-phase short-circuit faults[J].Proceedings of the CSEE,2013,33(1):130-136. [13]Lei Yaguo,Lin Jing,He Zhengjia,et al.A review on empirical mode decomposition in fault diagnosis of rotating machinery[J].Mechanical Systems and Signal Processing,2013,35(1/2):108-126. [14]Chan J C,Ma Hui,Saha T K,et al.Self-adaptive partial discharge signal de-noising based on ensemble empirical mode decomposition and automatic morphological thresholding[J].IEEE Transactions on Dielectrics and Electrical Insulation,2014,21(1):294-303. [15]朱宁辉,白晓民,董伟杰.基于EEMD的谐波检测方法[J].中国电机工程学报,2013,33(7):92-98. Zhu Ninghui,Bai Xiaomin,Dong Weijie.Harmonic detection method based on EEMD[J].Proceedings of the CSEE,2013,33(7):92-98.
2015, Vol. 30 
