基于正序电流有功分量的有源配电网多端差动保护方法研究

Research on Multi-terminal Differential Protection Method Based on Active Component of Positive Sequence Current

分布式电源的接入,使得潮流双向流动、短路电流变化复杂,传统三段式电流保护难以适用。针对分布式电源负荷多端接入场景下难以解决数据同步的问题,提出一种基于正序电流有功分量的多端差动保护方法,利用正序电流有功分量为直流量、基本不受对时误差影响的特点,构造差动保护判据,实现多端差动保护。仿真结果表明,该方法能够有效判别区内故障,且具有一定的抗过渡电阻能力。

The access of distributed power source makes the bidirectional flow of power flow and the change of short-circuit current complicated,and the traditional three-stage current protection is difficult to apply.In order to solve the problem of data synchronization in the scenario of multi-terminal load access of distributed power supply,a multi-terminal differential protection method based on the active component of positive sequence current was proposed.The differential protection criterion is formed to realize the multi-terminal differential protection method by taking advantage of the fact that the active component of positive sequence current is a direct flow,which is basically not affected by the time error.Simulation results show that the proposed method can effectively identify faults in the region and has a certain ability to resist transition resistance.