扩展Prony谐波分析法在配电网接地选线中的应用

当配电网单相接地故障发生在相电压过零点附近时故障线路零序电流中含有大量的暂态感应电流直流分量.文章提出了利用扩展Pronv算法,提取各线路零序电流中衰减的直流分量或低频振荡分量,根据故障线路和非故障线路零序电流在这两个分量上的差异,来确定故障线路的方法.应用PSCAD仿真也表明,用该方法实现配电网相电压过零点附近发生故障的故障选线,具有很高的灵敏度和可靠性.

Application of Extended Prony Algorithm in Phase-To-Ground Fault Detection of Distribution Networks

If single phase to earth fault of distribution network occurs when the phase voltage is near zero, there are lots of transient decay induced current components contained in zero sequence current of faulty line. Based on this phenomenon,a new method of faulty line detection is proposed, in which the extended Prony algorithm is used to get the components of the decay direct current or low oscillating frenquency current in zero sequence current of each line. Because these tow components in faulty line is distinct different from which in normal line, the faulty line can be found out. Lots of PSCAD simulation results show that the proposed method can exactly and reliably detect the faulty line occuring fault when phase voltage is near zero.