基于二次电弧的电力网单相接地故障性质甄别
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摘要
为了避免单相故障时自动重合闸装置重合于永久性故障,针对超高压输电线路,首先对单相接地故障时的物理过程进行了分析,紧接着分析了瞬时性故障与永久性故障情况下相电压的特点,然后,从原理上揭示了在二次电弧燃烧阶段两种故障情况下电压信号能量时间分布明显不同。在此基础上提出了利用小波包能谱值来甄别单相故障性质的方法,对采集到的故障相电压信号进行相应的小波包变换,计算相应的能谱值,通过比较能谱值的大小来甄别故障性质。理论分析和基于大量电磁暂态程序EMTP-RV的仿真结果均表明该方法能够较为精准地模拟实际故障,具有较好的实践应用价值。
The physical process of the single-phase fault was analyzed on EHV transmission lines so that to avoid reclosing on single-phase permanent fault。then,The voltage characteristics are compared between transient fault and permanent fault and the fact is revealed that,in principle,the energy time distribution in the bands where the secondary arc energy concentrates is distinctly different。A method,which to make use of the Wavelet Packet Energy Spectrum Value to identify fault types for the single-phase earth fault was proposed。The wavelet packet decomposition of the acquired post-fault voltage signal was performed and the Energy Spectrum Value was extracted and then was compared with Energy Spectrum Value to detect fault types。Theoretical analysis and based on lots of EMTP-RV simulation experiments expatiated that this method can discriminate the type of faults accurately,and has better practicalness and application value。
The physical process of the single-phase fault was analyzed on EHV transmission lines so that to avoid reclosing on single-phase permanent fault。then,The voltage characteristics are compared between transient fault and permanent fault and the fact is revealed that,in principle,the energy time distribution in the bands where the secondary arc energy concentrates is distinctly different。A method,which to make use of the Wavelet Packet Energy Spectrum Value to identify fault types for the single-phase earth fault was proposed。The wavelet packet decomposition of the acquired post-fault voltage signal was performed and the Energy Spectrum Value was extracted and then was compared with Energy Spectrum Value to detect fault types。Theoretical analysis and based on lots of EMTP-RV simulation experiments expatiated that this method can discriminate the type of faults accurately,and has better practicalness and application value。
引文
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[6]程玲.超(特)高压输电电路单相自适应重合闸的技术研究[D].北京:华北电力大学,2007.
[7]Li Bin,Li Yongli,Zeng,et al.A Numerical Algorithm for Single pole Adaptive Reclosure.In:Proceedings Power System Technology.Vol4.Kunming:2002.2612-2616.
[8]何正友,钱清泉.电力系统暂态信号分析中小波基的选择原则[J].电力系统自动化,2003,27(10):45-48.
[9]解广润.电力系统过电压[M].北京:水利水电出版社,1985.
[2]葛哲学,沙威.小波分析理论与Matlab R2007实现[M].北京:电子工业出版社,2007.
[3]夏明超,黄益庄,王勋.高压输电线路暂态保护的发展与现状[J].电网技术,2002,26(11):65-69.
[4]胡科.自适应重合闸的研究[D].北京:华北电力大学,2004.
[5]郑治真,沈萍,杨选辉,万玉莉.小波变换及其Matlab工具的应用[M].北京:地震出版社,2001.
[6]程玲.超(特)高压输电电路单相自适应重合闸的技术研究[D].北京:华北电力大学,2007.
[7]Li Bin,Li Yongli,Zeng,et al.A Numerical Algorithm for Single pole Adaptive Reclosure.In:Proceedings Power System Technology.Vol4.Kunming:2002.2612-2616.
[8]何正友,钱清泉.电力系统暂态信号分析中小波基的选择原则[J].电力系统自动化,2003,27(10):45-48.
[9]解广润.电力系统过电压[M].北京:水利水电出版社,1985.
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