基于小波包的小电流接地系统故障选线的新判据
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摘要
分析了故障选线的现状和基于小波包选线方法的优势及不足,提出了一种基于小波包的接地故障选线的新判据:先根据能量最大原则确定暂态电容电流最集中的特征频带,再比较各条线路特征频带的模最大值和零序电压首半波的极性以确定故障线路。该判断过程简单,抗干扰能力强,并且能够在只有2回线路的情况下选出故障线路。仿真结果表明,该判据不受接地条件和接地方式的影响,能够更准确可靠地选出故障线路。
This paper analyses the development of fault line selection, the deficiencies and the advantages of the methods based on wavelet packets and presents a new criterion for earth fault line selection based on wavelet packets. Based on the principle of maximum energy,it selects the special frequency band that has the major characteristics of transient capacitance current.Comparing the polarity of the special frequency band of each line with the polarity of the zero sequence voltage's first half wave,it can detect the fault line. The detecting process with this new criterion is simple and more able to decrease the affects of disturbances. Further more, this new criterion is still effective in the case of two lines in power system. Simulation indicates that on condition of various earth faults, the fault line can be selected based on the criterion more reliably.
This paper analyses the development of fault line selection, the deficiencies and the advantages of the methods based on wavelet packets and presents a new criterion for earth fault line selection based on wavelet packets. Based on the principle of maximum energy,it selects the special frequency band that has the major characteristics of transient capacitance current.Comparing the polarity of the special frequency band of each line with the polarity of the zero sequence voltage's first half wave,it can detect the fault line. The detecting process with this new criterion is simple and more able to decrease the affects of disturbances. Further more, this new criterion is still effective in the case of two lines in power system. Simulation indicates that on condition of various earth faults, the fault line can be selected based on the criterion more reliably.
引文
[1] 李孟秋,王耀南,王辉,等(Li Mengqiu,Wang Yaonan,Wang Hui,et al).小电流接地系统单相接地故障点探测方法的研究(A new approach on detecting the single-phase-to-ground fault location on power system with neutral unearthed)[J].中国电机工程学报 (Proceedings of the CSEE),2001,21(10) :6-9
[2] 曾祥君,K. K. Chan,尹项根等(ZENG Xiangjun,K. K. Chan,YIN Xianggen,et al). 信息融合技术在故障选线中的应用(Earth Fault Feeder Detection with Information Fusion)[J]. 继电器(Relay),2002,30(9) :15-18
[3] 马珂,张保会(Ma Ke,Zhang Baohui). 中性点非直接接地系统故障选线原理的发展与展望(Development and prospect of the single-phase gounding fault detection in unearthed of compensated neutral networks)[J]. 继电器(Relay),2003,31(5) :65-70
[4] Omar A S. Youssef, new algorithm to phase selection based on wavelet transforms, IEEE, 2002,17(4) : .
[5] 贾清泉,刘连光,杨以涵,等(Jia Qingquan,Liu Lianguang,Yang Yihan et al). 应用小波检测故障突变特性实现配电网小电流故障选线保护 (Abrupt change detection with wavelet for small current fault relaying)[J]. 中国电机工程学报(Proceedings of the CSEE),2001,21(10) :78-82
[6] 毛鹏,孙雅明,张兆宁,等(Mao Peng,Sun Yaming,Zhang Zhaoning,et al). 小波包在配电网单相接地故障选线中的应用(Wavelets packet based on detection of phase-to-ground fault in distribution automation system)[J]. 电网技术(Power System Technology),2000,24(6) :9-13
[7] 张艳霞,陈超英,赵杰辉,等(ZHANG Yanxia,CHEN Chaoying,ZHAO Jiehui,et al). 配电网单相接地故障选线的一种新方法(A New Method of Locatmg Fault Line Under Single Phase to Ground Fault in Distribution Network)[J].电网技术(Power System Technology),2002,26(10) :21-24
[8] 戴剑锋,张艳霞(Dai Jianfeng,Zhang Yanxia)基于多频率分析的自适应配电网故障选线研究(Study on adaptively choosing fault line under single-phase to ground fault based on analysis of multi-frequency bands)[J]. 中国电机工程学报(Proceedings of the CSEE),2003,23(5) :44-47
[9] 郑治真,沈平,杨选辉,等.小波变换及其MATLAB工具的应用[M].北京:地震出版社,2001． 10．
[10] 王耀南.智能信息处理技术[M].北京:高等教育出版社,2003,8
[11] 要焕年,曹梅月.电力系统谐振接地[M].北京:中国电力出版社,2000
[12] 薛永瑞,徐丙垠,冯祖仁等(Xue Yongrui,Xu Bingyin,Feng Zuren,et al). 小电流接地故障暂态方向保护原理研究(The principle of directional earth fault protection using zero sequence transients in non-solid earthed network)[J]. 中国电机工程学报(Proceedings of the CSEE),2003． 23(7) :51-56
[2] 曾祥君,K. K. Chan,尹项根等(ZENG Xiangjun,K. K. Chan,YIN Xianggen,et al). 信息融合技术在故障选线中的应用(Earth Fault Feeder Detection with Information Fusion)[J]. 继电器(Relay),2002,30(9) :15-18
[3] 马珂,张保会(Ma Ke,Zhang Baohui). 中性点非直接接地系统故障选线原理的发展与展望(Development and prospect of the single-phase gounding fault detection in unearthed of compensated neutral networks)[J]. 继电器(Relay),2003,31(5) :65-70
[4] Omar A S. Youssef, new algorithm to phase selection based on wavelet transforms, IEEE, 2002,17(4) : .
[5] 贾清泉,刘连光,杨以涵,等(Jia Qingquan,Liu Lianguang,Yang Yihan et al). 应用小波检测故障突变特性实现配电网小电流故障选线保护 (Abrupt change detection with wavelet for small current fault relaying)[J]. 中国电机工程学报(Proceedings of the CSEE),2001,21(10) :78-82
[6] 毛鹏,孙雅明,张兆宁,等(Mao Peng,Sun Yaming,Zhang Zhaoning,et al). 小波包在配电网单相接地故障选线中的应用(Wavelets packet based on detection of phase-to-ground fault in distribution automation system)[J]. 电网技术(Power System Technology),2000,24(6) :9-13
[7] 张艳霞,陈超英,赵杰辉,等(ZHANG Yanxia,CHEN Chaoying,ZHAO Jiehui,et al). 配电网单相接地故障选线的一种新方法(A New Method of Locatmg Fault Line Under Single Phase to Ground Fault in Distribution Network)[J].电网技术(Power System Technology),2002,26(10) :21-24
[8] 戴剑锋,张艳霞(Dai Jianfeng,Zhang Yanxia)基于多频率分析的自适应配电网故障选线研究(Study on adaptively choosing fault line under single-phase to ground fault based on analysis of multi-frequency bands)[J]. 中国电机工程学报(Proceedings of the CSEE),2003,23(5) :44-47
[9] 郑治真,沈平,杨选辉,等.小波变换及其MATLAB工具的应用[M].北京:地震出版社,2001． 10．
[10] 王耀南.智能信息处理技术[M].北京:高等教育出版社,2003,8
[11] 要焕年,曹梅月.电力系统谐振接地[M].北京:中国电力出版社,2000
[12] 薛永瑞,徐丙垠,冯祖仁等(Xue Yongrui,Xu Bingyin,Feng Zuren,et al). 小电流接地故障暂态方向保护原理研究(The principle of directional earth fault protection using zero sequence transients in non-solid earthed network)[J]. 中国电机工程学报(Proceedings of the CSEE),2003． 23(7) :51-56
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