分布式电源接入对配电网线路保护的影响及对策研究

含分布式电源并网的配电网发生短路故障时,流经保护的短路电流会受到分布式电源提供的助增电流、汲取电流或反方向电流的影响,导致线路电流保护的误动或者拒动。基于IEEE33节点配电系统,在PSASP平台上搭建了仿真模型,计算了多个故障点下流经保护的短路电流大小,分析了分布式电源不同接入容量和位置对线路电流保护的影响,得出了对保护的分区域影响结论,并给出了几种减小影响的措施。

Impact of Grid-Connected Distributed Generation on Distribution Network Line Protection and Its Countermeasure

When the short-circuit fault occurs at the distribution network connected with distributed generation （DG）, the short-circuit cur-rent in protection equipment will be affected by the increasing lfow, decreasing lfow and opposite direction lfow of the distributed generation, to cause the misoperation or failure action of current protection. Based on the IEEE33-node distribution system, the simulation model was built on PSASP platform. This paper calculated the short-circuit current through the protection in the case of multiple fault points and analyzed the inlfu-ence of different capacity and position of DG on the current protection. The effect to the region of protection is concluded and several methods to lower the inlfuence are proposed.