基于小波奇异熵和支持向量机的配电网单相接地选线新方法
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摘要
针对目前小电流系统接地系统选线方法存在的问题,提出了一种新的故障选线方法。对各条线路故障后一个周波内的零序电流作小波分析,并且将由系数构成的矩阵作奇异分解并得到对应的小波奇异熵(wavelet singular entropy,WSE),利用网格搜索法寻优,得到最优的非负惩罚因子参数C和核函数参数g。采用优化的支持向量机(support vector machine,SVM)对各条线路的WSE进行分类,即选出故障线路。仿真结果表明提出的方法不受噪声干扰、电弧重燃、采样不同步、补偿度不同等干扰因素对故障选线结果的影响,可以准确、可靠地实现故障选线。
In view of the problems existing in the selection method of the small current grounding system,this paper proposes a new fault line selection method. Zero sequence current within a period after fault of each line is analyzed by wavelet,the matrix consisting of wavelet coefficients is decomposed by singular value decomposition,and then the singular entropy can be obtained. The optimum parameters of non-negative penalty factor C and kernel function parameter g can be got through grid search method. The wavelet singular entropy is classified by optimized SVM,which can select the fault line accurately. The simulation results verify that the proposed approach is accurate and reliable for the fault line selection.
In view of the problems existing in the selection method of the small current grounding system,this paper proposes a new fault line selection method. Zero sequence current within a period after fault of each line is analyzed by wavelet,the matrix consisting of wavelet coefficients is decomposed by singular value decomposition,and then the singular entropy can be obtained. The optimum parameters of non-negative penalty factor C and kernel function parameter g can be got through grid search method. The wavelet singular entropy is classified by optimized SVM,which can select the fault line accurately. The simulation results verify that the proposed approach is accurate and reliable for the fault line selection.
引文
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[13]司瑞琦,黄翰,罗建,等.基于消弧线圈补偿特征的故障选线新方法[J].电力系统保护与控制,2014,42(24):16-22.SI Ruiqi,HUANG Han,LUO Jian,et al.Fault line selection approach based on compensation characteristics of extinction coil[J].Power System Protection and Control,2014,42(24):16-22(in Chinese).
[14]梁睿,崔连华,都志立,等.基于广域行波初始波头时差关系矩阵的配电网故障选线及测距[J].高电压技术,2014,40(11):3411-3417.LIANG Rui,CUI Lianhua,DU Zhili,et a1.Fault line selection and location in distribution power network based on traveling wave time difference of arrival relationships[J].High Voltage Enginering,2014,40(11):3411-3417(in Chinese).
[15]都洪基,姚婷婷,刘林兴.遗传优化神经网络在小电流接地系统中的应用[J].继电器,2004,32(5):29-31.DU Hongji,YAO Tingting,LIU Linxing.Fault line selection in power system with indirectly earthed neutral based on the artificial neural network optimized by genetic algorithm[J].Relay,2004,32(5):29-31(in Chinese).
[16]庞清乐,陈生银.基于人工免疫算法的小电流配接地故障选线[J].电力系统保护与控制,2009,37(24):27-31.PANG Qingle,CHEN Shengyin.Artificial immune algorithm based fault line detection method for indirectly grounding power system[J].Power System Protection and Control,2009,37(24):27-31(in Chinese).
[17]庞清乐,孙同景,钟麦英,等.基于粗集理论的小电流配接地故障选线[J].中国电机工程学报,2007,27(4):60-64.PANG Qingle,SUN Tongjing,ZHONG Maiying,et al.Fault line detection based on rough set theory in indirectly grounding system[J].Proceedings of the CSEE,2007,27(4):60-64(in Chinese).
[18]马涛,李春东.JDBH型接地保护装置的性能分析[J].电力电容器与无功补偿,2012,33(2):22-25.MA Tao,LI Chundong.Performance analysis of JDBH grounding protection device[J].Power Capacitor&Reactive Power Comensation,2012,33(2):22-25(in Chinese).
[19]顾荣斌,蔡旭,陈海坤,等.非有效接地电网单相电弧接地故障的建模及仿真[J].电力系统自动化,2009,33(13):63-67.GU Rongbin,CAI Xu,CHEN Haikun,et al.Modeling and simulation of single-phase arc grounding fault in noneffective earthed networks[J].Automation of Electrical Power System,2009,33(13):63-67(in Chinese).
[2]曾祥君,尹项根,于永源,等.基于注入变频信号法的经消弧线圈接地系统控制与保护新方法[J].中国电机工程学报,2000,20(1):29-32.ZENG Xiangjun,YIN Xianggen,YU Yongyuan,et al.New methods for control and protection relay in a compensated medium voltage distribution network based on injecting various frequency current[J].Proceedings of the CSEE,2000,20(1):29-32(in Chinese).
[3]孟润泉,米建军.五次谐波检测原理及其在矿井高压电网单相接地保护中的应用[J].工矿自动化,2004(3):10-13.MENG Runqun,MI Jianjun.Detecton principle of the fifth harmonic and its application in single-phase grounding protection system of high-voltage power networks of mine[J].Industry and Mine Automation,2004,24(6):10-13(in Chinese).
[4]徒有峰,何俊佳,周志成,等.基于零序功率即谐波相位综合法的小电流接地系统微机选线装置[J].高压电器,2006,42(3):190-193TU Youfeng,HE Junjia,ZHOU Zhicheng,et al.NUGS choosing earth-fault line device based on zero sequence power method and harmonic phase method[J].High Voltage Apparatus,2006,42(3):190-193(in Chinese).
[5]束洪春,彭仕欣,赵兴兵.一种配电网线—缆混合线路故障选线新方法[J].电力系统自动化,2008,32(11):61-65.SHU Hongchun,PENG Shixin,ZHAO Xingbing.A new fault line detection method for hybrid transmissin lines of distribution system[J].Automation of Electrical Power System,2008,32(11):61-65(in Chinese).
[6]赵慧梅,张保会,段建东,等.一种自适应捕捉特征频带的配电网单相接地故障选线新方案[J].中国电机工程学报,2006,26(2):41-46.ZHAO Huimei,ZHANG Baohui,DUAN Jiandong.A new cheme of fault line selection with adaptive capturing the feature band forpower distribution networks[J].Proceedings of the CSEE,2006,26(2):41-46(in Chinese).
[7]戴剑锋,张艳霞.基于多频带分析的自适应配电网故障选线研究[J].中国电机工程学报,2003,23(5):44-47.DAI Jianfeng,ZHANG Yanxia.Study on adaptive choosing fault line under single phase to ground fault based on analysis of multi-frequency bands[J].Proceedings of the CSEE,2003,23(5):44-47(in Chinese).
[8]符玲,何正友,麦瑞坤,等.小波熵证据的信息融合在电力系统故障中的应用[J].电力自动化设备,2008,28(9):64-67.FU Ling,HE Zhengyou,MAI Ruikun,et al.Information fusion method theory of entropy evidence and its application to fault line diagnose in power system[J].Electric Power Automation Equipment,2008,28(9):64-67(in Chinese).
[9]邢亚辉.利用零序电流的相关性进行小电流接地系统故障选线[J].电力自动化设备,2007,27(4):60-64.XING Yahui.Fault line selection with correlativity of zero frequency current in non-solid-earthed network[J].Electric Power Automation Equipment,2007,27(4):60-64(in Chinese).
[10]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,2013,33(19):183-189.GUO Moufa,LIU Shidan,YANG Gengjie.A new approach to detect fault lines in distribution network using similarity recognition based on time-frequency spectrum[J].Proceedings of the CSEE,2013,33(19):183-189(in Chinese).
[11]陈奎,韦晓广,陈景波.基于样本数据处理和ADABOOST的小电流接地故障选线[J].中国电机工程学报,2014,34(34):6228-6237.CHEN Kui,WEI Xiaoguang,CHEN Jingbo.Fault line detection using sampled data processing and ADABOOST for small current grounding system[J].Proceedings of the CSEE,2014,34(34):6228-6237(in Chinese).
[12]姜博,董新洲,施慎行.基于单相电流行波的配电网单相接地故障选线[J].中国电机工程学报,2014,34(34):6216-6227.JIANG Bo,DONG Xinzhou,SHI Shenxing.A method of single phase to ground fault feeder selection based on single phase current traveling wave for distribution lines[J].Proceedings of the CSEE,2014,34(34):6216-6227(in Chinese).
[13]司瑞琦,黄翰,罗建,等.基于消弧线圈补偿特征的故障选线新方法[J].电力系统保护与控制,2014,42(24):16-22.SI Ruiqi,HUANG Han,LUO Jian,et al.Fault line selection approach based on compensation characteristics of extinction coil[J].Power System Protection and Control,2014,42(24):16-22(in Chinese).
[14]梁睿,崔连华,都志立,等.基于广域行波初始波头时差关系矩阵的配电网故障选线及测距[J].高电压技术,2014,40(11):3411-3417.LIANG Rui,CUI Lianhua,DU Zhili,et a1.Fault line selection and location in distribution power network based on traveling wave time difference of arrival relationships[J].High Voltage Enginering,2014,40(11):3411-3417(in Chinese).
[15]都洪基,姚婷婷,刘林兴.遗传优化神经网络在小电流接地系统中的应用[J].继电器,2004,32(5):29-31.DU Hongji,YAO Tingting,LIU Linxing.Fault line selection in power system with indirectly earthed neutral based on the artificial neural network optimized by genetic algorithm[J].Relay,2004,32(5):29-31(in Chinese).
[16]庞清乐,陈生银.基于人工免疫算法的小电流配接地故障选线[J].电力系统保护与控制,2009,37(24):27-31.PANG Qingle,CHEN Shengyin.Artificial immune algorithm based fault line detection method for indirectly grounding power system[J].Power System Protection and Control,2009,37(24):27-31(in Chinese).
[17]庞清乐,孙同景,钟麦英,等.基于粗集理论的小电流配接地故障选线[J].中国电机工程学报,2007,27(4):60-64.PANG Qingle,SUN Tongjing,ZHONG Maiying,et al.Fault line detection based on rough set theory in indirectly grounding system[J].Proceedings of the CSEE,2007,27(4):60-64(in Chinese).
[18]马涛,李春东.JDBH型接地保护装置的性能分析[J].电力电容器与无功补偿,2012,33(2):22-25.MA Tao,LI Chundong.Performance analysis of JDBH grounding protection device[J].Power Capacitor&Reactive Power Comensation,2012,33(2):22-25(in Chinese).
[19]顾荣斌,蔡旭,陈海坤,等.非有效接地电网单相电弧接地故障的建模及仿真[J].电力系统自动化,2009,33(13):63-67.GU Rongbin,CAI Xu,CHEN Haikun,et al.Modeling and simulation of single-phase arc grounding fault in noneffective earthed networks[J].Automation of Electrical Power System,2009,33(13):63-67(in Chinese).