【摘要】 为实现含有多条馈线及电缆与架空线并存的复杂系统的单相接地故障准确选线,使用PSCAD对复杂系统进行建模,并对各线路的单相接地故障进行仿真模拟,应用MATLAB中的小波工具箱,对仿真数据进行处理。首先,通过使用小波分解得到模极大值,来确定故障发生时刻。然后,利用小波包分解系数来判断故障线路零序电流与故障线路的极性关系,进行故障选线。最后,使用故障测度作为选线判据,取故障测度最大值对应的线路为故障线路。大量实验证明,故障选线过程正确可靠,抗干扰能力强。更多还原

【Abstract】 In order to achieve accurate single-phase ground faults for the complex system with multiple feeders and cables co-existing with overhead lines,we model it with PSCAD and run diverse simulations of single-phase ground faults on each line. The simulation data was analyzed by wavelet toolbox in MATLAB. Firstly,the modulus maxima are obtained through the wavelet decomposition to determine the beginning of fault. Then,the wavelet packet decomposition coefficient is used to determine the polarity relationship of the zero-sequence current between the non-faulted line and the fault lines. Finally,the fault measure is used as the selection criterion,and the line corresponding to the maximum value of the fault measure is the fault line. After a large number of experiments,it can be concluded that the fault line selection process is correct and reliable,and it has strong anti-interference ability.更多还原