超高压线路差动保护电容电流的精确补偿方法

针对超高压输电线路分布电容电流对差动保护的影响,提出了一种电容电流的精确补偿方法。通过把各种因素对分布电容电流的影响统一归入分布电容参数的变化,实时在线计算分布电容参数值,从而更准确地进行电容电流补偿,提高差动保护动作的速度和准确性。ATP仿真结果表明该补偿方法比传统的基于给定分布电容参数进行补偿的方法有更好的补偿效果。

Novel Accurate Compensation Method of Capacitance Current of UHV Transmission Line

Based on the study about the influence of the distributed capacitance current of UHV transmission line on differential current protection, a novel accurate compensation method of capacitance current is proposed. The proposed method takes account of all the factors that affect the capacitance current by the variation of the capacitance value. The capacitance value can be calculated online, based on which the capacitance current can be compensated accurately. Simulation results demonstrate that the proposed method is superior to the fixed compensation method.