基于实时小波变换的配网短路故障快速检测技术  

Fast Detection Technology of Short-circuit Fault in Distribution Network Based on the Real-time Wavelet Transform

作　　者：刘宏森 李迎华 王恒 袁静 

机构地区：[1]国网铜川供电公司,陕西铜川727000 [2]西安森宝电气工程有限公司,西安710119

出　　处：《高压电器》2018年第3期225-230,237,共7页High Voltage Apparatus

摘　　要：针对10 kV配网容量不断增加而引起的短路故障电流急剧上升,甚至超过断路器开断电流能力的问题,常规的故障检测算法主要是通过有效值、瞬时值、斜率等特征进行判断,存在误检率较高、检测速度较慢等缺点。文中提出了一种基于实时小波变换的配网短路故障快速检测算法,即每次更新8个电流采样数据,并采用递推算法进行三层小波变换,以三相电流的第3层分解小波系数d3绝对值之和与电流瞬时值作为检测短路故障的综合判据。在MATLAB/Simulink下完成了10 kV配网三相短路故障的仿真,对仿真过程进行了详细的说明。最后对文中算法检测短路故障的时间进行了多次仿真,结果表明采用快速递推法进行实时小波变换可以快速、有效地检测出短路故障,具有良好的适用性。As the increasing capacity of 10 kV distribution network caused a rush rise of the short-circuit current, even exceed the max breaking capacity of fault current limiter（FCL）. The normal algorithms to detect the short-circuit fault are always by current RMS, transient value or slope, but these methods are imperfect in detection speed or detection accuracy. This paper presents a real-time wavelet transform algorithm to detect fault quickly in distribution network. By updating eight current sampling data each time and using the method of recursion wavelet transform, we combine the sum of the absolute value of the third wavelet coefficients d3 to the current instantaneous value as a comprehensive criterion to detect short circuit faults. The three-phase short-circuit fault simulation are carried out based on MATLAB/ Simulink, it presents a detailed explanation of the process. Finally, this paper has conducted thousands of simulations of the time of short-circuit fault detection, and the results proved that the real-time wavelet transform can detect short circuit faults quickly and effectively ,it also has good adaptability.

关 键 词：电力系统 短路故障 故障电流限制器 小波变换 快速检测 

分 类 号：TM711[电气工程—电力系统及自动化]