基于暂态电容电流补偿的线路差动保护

稳态电容电流补偿法不能补偿暂态电容电流,影响了差动保护的性能;时域补偿法和基于贝瑞隆模型的补偿法能对暂态电容电流进行有效补偿。提出一种基于时域补偿的差动保护实用算法,并给出以上3种补偿法在应用于带并联电抗器线路时相应的修正方案。仿真表明,时域补偿差动判据和贝瑞隆差动实用判据能有效补偿暂态电容电流,有利于降低动作门槛,从而大大提高保护的灵敏度和动作速度,其中贝瑞隆差动实用判据效果更佳。

Current Differential Protection Based on Transient Capacitance Current Compensation

Steady state capacitance current compensation method can't compensate transient capacitance current, which affects the performance of current differential protection. While both the time domain compensation method and the scheme based on Bergeron model can compensate transient capacitance current effectively. An applied algorithm of current differential protection based on time domain capacitance current compensation is presented. Different modifying criterions for the three compensation methods are proposed for their application in transmission line with shunt reactors. Simulation results show that both the criterion based on time domain compensation and the applied one based on Bergeron model can compensate transient capacitance current effectively, which is propitious to reduce tripping threshold and improve the action speed and sensitivity. It's shown that the applied criterion based on Bergeron model can provide a better result.