基于负序电压的配电网断线故障定位方法
A Method for Locating Disconnected Faults in Distribution Networks Based on Negative Sequence Voltage

随着配电网规模的不断扩大，架空线路绝缘化率的提高，断线故障发生率也随之提高。由于断线故障导致三相电压、电流严重不平衡，危害电气设备和人身安全，影响电力系统供电可靠性。因此，有必要对配电网断线故障定位方法进行研究，在断线故障发生后尽快排查和隔离，减小其造成的危害。本文考虑了分布式电源的影响，对配电网断线故障下分布式电源的负序电压特征进行了分析，在此基础上，根据不同故障位置下分布式电源序电压的差异，提出了一种基于负序电压的配电网断线故障定位方法。仿真结果表明，所提方法能够准确定位断线故障区段，具有较高的可靠性。
With the continuous expansion of the scale of the distribution network, the insulation rate of overhead lines has increased, and the incidence of disconnection faults has also increased. Due to the disconnection fault, the three-phase voltage and current are seriously unbalanced, which endangers electrical equipment and personal safety, and affects the reliability of the power supply of the power system. Therefore, it is necessary to conduct research on the method of locating disconnection faults in the distribution network, and to investigate and isolate them as soon as possible after the disconnection fault occurs, so as to reduce the harm. This paper considers the influence of distributed generations, and analyzes the negative sequence voltage characteristics of distributed generations under the disconnection fault of the distribution network. On this basis, according to the difference in sequence voltage of distributed generations under different fault locations, a method for locating disconnection faults in distribution network based on negative sequence voltage is proposed. The simulation results show that the proposed method can accurately locate the disconnection fault section and has high reliability.