基于改进LMD和能量相对熵的主动配电网故障定位方法

doi:10.11930/j.issn.1004-9649.202106040

摘要/Abstract

摘要： 针对配电网发生单相接地故障且分布式电源（distributed generations, DGs）大量接入后，配电网结构和运行方式复杂多变、故障后电气量不明显、故障特征弱等特点，提出一种基于改进局部均值分解（improved local mean decomposition, ILMD）和能量相对熵的主动配电网故障定位方法。首先，利用镜像延拓将信号在两端延拓，消除LMD存在的端点效应，同时，在信号中加入自适应噪声，克服LMD存在的模态混叠问题，对各区段暂态零序电流进行ILMD分解；然后对分解后所有乘积函数（product function, PF）的能量相对熵进行计算，所有PF分量的相对能量熵之和即为区段间的相对能量熵，通过所设置的定位判据，对故障区段进行判断。仿真结果表明，所提算法在10 kV小电流接地系统和改进的IEEE33节点系统中，在不同的仿真条件下故障定位结果准确率高，验证了所提方法的准确性。

关键词: 主动配电网, 故障定位, 局部均值分解, 镜像延拓, 自适应噪声, 暂态零序电流

Abstract: In view of the characteristics of distribution network with large-scale integration of distributed generation when single-phase grounding fault occurs, such as complex structure and operation mode, obscure electrical quantity after fault, weak fault characteristics and so on, this paper proposes a new fault location method for active distribution network based on improved local mean decomposition (ILMD) and energy relative entropy. Firstly, the mirror extension is used to extend the signals at both ends to eliminate the endpoint effect of LMD. At the same time, the adaptive noise is added to the signal to overcome the mode aliasing problem of LMD, and the ILMD is used to decompose the transient zero sequence current of each section. Then the energy relative entropy of all product functions (PF) after decomposition is calculated. The sum of relative energy entropy of all PF components is the relative energy entropy between sections. The fault section is judged by the positioning criteria set in this paper. Simulation results show that the proposed algorithm has high accuracy in fault location for 10 kV small current grounding system and improved IEEE 33 node system under different simulation conditions, which verifies the accuracy of the proposed method.

Key words: active distribution network, fault location, local mean decomposition(LMD), mirror extension, adaptive noise, transient zero-sequence current

徐艳春, 赵彩彩, 孙思涵, MI Lu. 基于改进LMD和能量相对熵的主动配电网故障定位方法[J]. 中国电力, 2021, 54(11): 133-143.

XU Yanchun, ZHAO Caicai, SUN Sihan, MI Lu. Fault Location for Active Distribution Network Based on Improved LMD and Energy Relative Entropy[J]. Electric Power, 2021, 54(11): 133-143.

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链接本文: https://www.electricpower.com.cn/CN/10.11930/j.issn.1004-9649.202106040

https://www.electricpower.com.cn/CN/Y2021/V54/I11/133

参考文献

[1] 万千, 夏成军, 管霖, 等. 含高渗透率分布式电源的独立微网的稳定性研究综述[J]. 电网技术, 2019, 43(2): 598–612
WAN Qian, XIA Chengjun, GUAN Lin, et al. Review on stability of isolated microgrid with highly penetrated distributed generations[J]. Power System Technology, 2019, 43(2): 598–612
[2] 张磐, 张愉, 丁一, 等. 基于微扰法的低压有源配电网故障定位方法[J]. 中国电力, 2018, 51(12): 63–71
ZHANG Pan, ZHANG Yu, DING Yi, et al. Fault location for low voltage active distribution network based on perturbation method[J]. Electric Power, 2018, 51(12): 63–71
[3] 胡福年, 张认, 卞小亮. 基于图论的主动配电网故障定位方法[J]. 控制工程, 2021, 28(5): 833–838
HU Funian, ZHANG Ren, BIAN Xiaoliang. Fault location method of active distribution network based on graph theory[J]. Control Engineering of China, 2021, 28(5): 833–838
[4] 贾伯岩, 马天祥, 张智远, 等. 计及不确定性的含分布式发电并网的配电网故障区段定位方法[J]. 电力系统保护与控制, 2020, 48(14): 35–42
JIA Boyan, MA Tianxiang, ZHANG Zhiyuan. et al. Fault section location method for distribution networks with distributed generation and grid connection considering uncertainty[J]. Power System Protection and Control, 2020, 48(14): 35–42
[5] 邱彬, 罗添元, 宁博, 等. 基于BAS-IGA的含分布式电源配电网故障定位[J]. 电力系统及其自动化学报, 2021, 33(02): 8–14
QIU Bin, LUO Tianyuan, NING Bo, et al. Fault location of distribution network with distribution generation based on BAS-IGA[J]. Proceedings of the CSU-EPSA, 2021, 33(02): 8–14
[6] 胡珏, 韦钢, 谢素娟, 等. 基于人工鱼群算法的主动配电网故障定位[J]. 智慧电力, 2020, 48(06): 112–118, 124
HU Jue, WEI Gang, XIE Sujuan, et al. Active distribution network fault location method based on artificial fish swarm algorithm[J]. Smart Power, 2020, 48(06): 112–118, 124
[7] 胡福年, 孙守娟. 基于图论的矩阵算法在配电网故障定位中的应用[J]. 中国电力, 2016, 49(3): 94–98
HU Funian, SUN Shoujuan. Fault location of distribution network by applying matrix algorithom based on graph theory[J]. Electric Power, 2016, 49(3): 94–98
[8] 袁佳歆, 李响, 张哲维. 基于注入信号的有源配电网单相接地故障选线方法[J]. 电测与仪表, 2020, 57(5): 44–49
YUAN Jiaxin, LI Xiang, ZHANG Zhewei. Research on single-phase grounding fault selection technology for active distribution network based on injected signal[J]. Electrical Measurement & Instrumentation, 2020, 57(5): 44–49
[9] 刘斯琪, 喻锟, 曾祥君, 等. 基于零序电流幅值连调的小电流接地系统故障区段定位方法[J]. 电力系统保护与控制, 2021, 49(9): 48–56
LIU Siqi, YU Kun, ZENG Xiangjun, et al. Fault location method of a non-effective earthed system based on zero sequence current amplitude continuous regulation[J]. Power System Protection and Control, 2021, 49(9): 48–56
[10] FARUGHIAN A, POLUEKTOV A, PINOMAA A, et al. Power line signalling based earth fault location[J]. The Journal of Engineering, 2018, 2018(15): 1155–1159.
[11] 李振兴, 万佳灵, 王新, 等. 基于中值电阻投切的故障选线与定位新方法[J]. 电力系统保护与控制, 2021, 49(7): 57–65
LI Zhenxing, WAN Jialing, WANG Xin, et al. A novel method of fault line selection and section location based on the input and cutoff of medium resistance[J]. Power System Protection and Control, 2021, 49(7): 57–65
[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. Study of accurate single-phase grounding fault location based on distributed parameter theory using data of zero sequence components[J]. Transactions of China Electrotechnical Society, 2015, 30(12): 472–479
[13] 戴志辉, 王旭. 基于改进阻抗法的有源配电网故障测距算法[J]. 电网技术, 2017, 41(6): 2027–2034
DAI Zhihui, WANG Xu. Impedance method based fault location algorithm for active distribution system[J]. Power System Technology, 2017, 41(6): 2027–2034
[14] 邓丰, 李欣然, 曾祥君, 等. 基于多端故障行波时差的含分布式电源配电网故障定位新方法[J]. 中国电机工程学报, 2018, 38(15): 4399–4409, 4640
DENG Feng, LI Xinran, ZENG Xiangjun, et al. A novel multi-terminal fault location method based on traveling wave time difference for radial distribution systems with distributed generators[J]. Proceedings of the CSEE, 2018, 38(15): 4399–4409, 4640
[15] 王雪文, 石访, 张恒旭, 等. 基于暂态能量的小电流接地系统单相接地故障区段定位方法[J]. 电网技术, 2019, 43(3): 818–825
WANG Xuewen, SHI Fang, ZHANG Hengxu, et al. A single-phase earth fault location method based on transient energy for non-effectively grounded system[J]. Power System Technology, 2019, 43(3): 818–825
[16] 张林利, 高厚磊, 徐丙垠, 等. 基于区段零序导纳的小电流接地故障定位方法[J]. 电力系统自动化, 2012, 36(20): 94–98
ZHANG Linli, GAO Houlei, XU Bingyin, et al. Fault location method based on zero-sequence admittance of sections in non-effectively grounded system[J]. Automation of Electric Power Systems, 2012, 36(20): 94–98
[17] 张怡真. 含DG的新型配电网小电流接地故障定位问题研究[D]. 福州: 福州大学, 2018.
ZHANG Yizhen. Research on fault location in non-effectively grounded new distribution network with DG[D]. Fuzhou: Fuzhou University, 2018.
[18] 束洪春, 刘佳露, 田鑫萃. 基于故障行波沿线突变和模型匹配的辐射状配电网故障定位[J]. 电力系统自动化, 2020, 44(9): 158–163
SHU Hongchun, LIU Jialu, TIAN Xincui. Fault location of radial distribution network based on sudden changes of fault traveling wave along line and model matching[J]. Automation of Electric Power Systems, 2020, 44(9): 158–163
[19] 杨耿杰, 许晔, 高伟, 等. 基于能量谱相似度自适应聚类的配电网接地故障区段定位方法[J]. 电力自动化设备, 2021, 41(3): 25–32
YANG Gengjie, XU Ye, GAO Wei, et al. Grounding fault section location method of distribution network based on adaptive clustering of similarities between energy spectra[J]. Electric Power Automation Equipment, 2021, 41(3): 25–32
[20] 李卫国, 许文文, 王旭光, 等. 基于广义S变换的有源配电网故障定位方法[J/OL]. 电测与仪表: 1–7 [2021-05-24]. http://kns.cnki.net/kcms/detail/23.1202.TH.20200722.0859.004.html.
LI Weiguo, XU Wenwen, WANG Xuguang, et al. Fault location method for active distribution network based on generalized S transform[J/OL]. Electrical Measurement & Instrumentation: 1–7[2021-05-24]. http://kns.cnki.net/kcms/detail/23.1202.TH.20200722.0859.004.html.
[21] 徐艳春, 高永康, 李振兴, 等. 改进LMD算法在微电网电能质量扰动信号检测中的应用[J]. 电网技术, 2019, 43(1): 332–341
XU Yanchun, GAO Yongkang, LI Zhenxing, et al. Application of improved LMD algorithm in signal detection of power quality disturbance in microgrid[J]. Power System Technology, 2019, 43(1): 332–341
[22] 刘渝根, 陈超, 杨蕊菁, 等. 基于小波相对熵的变电站直流系统接地故障定位方法[J]. 高压电器, 2020, 56(1): 169–174
LIU Yugen, CHEN Chao, YANG Ruijing, et al. Location method of ground fault in DC system of substation based on wavelet relative entropy[J]. High Voltage Apparatus, 2020, 56(1): 169–174
[23] 翁汉琍, 李昊威, 邢家维, 等. 采用S变换相位差及能量相对熵的换流变零序差动保护新判据[J]. 电力自动化设备, 2019, 39(9): 20–26
WENG Hanli, LI Haowei, XING Jiawei, et al. Novel criterion adopting S-transform phase angle difference and energy relative entropy for zero-sequence differential protection of converter transformer[J]. Electric Power Automation Equipment, 2019, 39(9): 20–26
[24] 熊春宝, 王猛, 于丽娜, 等. GNSS-RTK变形监测数据的CEEMDAN-WT联合降噪法[J]. 振动与冲击, 2021, 40(9): 12–18
XIONG Chunbao, WANG Meng, YU Lina, et al. CEEMDAN-WT joint denoising method for bridge GNSS-RTK deformation monitoring data[J]. Journal of Vibration and Shock, 2021, 40(9): 12–18
[25] 徐艳春, 樊士荣, 谭超, 等. 基于改进EWT-CMPE的高渗透率主动配电网电能质量扰动检测与分类[J]. 电网技术, 2020, 44(10): 3991–4005
XU Yanchun, FAN Shirong, TAN Chao, et al. Power quality disturbance detection and classification in high permeability active distribution network with improved EWT-CMPE[J]. Power System Technology, 2020, 44(10): 3991–4005