分布式电源接入下的配网故障定位研究

对分布式电源接入10 k V配网情况下的三相短路故障进行分析,探讨了不同故障位置以及分布式电源不同输出电流时,线路检测点等值阻抗的变化情况。仿真结果表明,当故障发生在分布式电源接入点上游时,故障区段中检测点得到的等值阻抗极小,相对于故障前的等值阻抗,有较大的变化量;而非故障区段中检测点得到的等值阻抗仍基本保持不变,相对于故障前的等值阻抗值几乎不变。可以根据故障前后各检测点等值阻抗变化量的大小差异,识别故障区段。

A Study on Fault Location of the Distribution Network with the DG

This essay analyzes the three-phase short-circuit fault in the 10kV distribution network with the distributed generation.In addition,it discusses about the variations of the equivalent impedance at the detection points of the line with different fault locations and different output currents of the distributed generators.The simulation results show that when the fault occurs at the upstream of the access point of the distributed generation,the equivalent impedance of the detection point in the fault section is very small and it changes a lot compared to that before the fault.However,the equivalent impedance obtained from the detection points in the non-fault section remains unchanged relative to that before the fault.Therefore,fault sections can can be identified based on the differences of the variations of the equivalent impedance at each detection point before and after the fault.