一种对配网继电保护影响最小的分布式电源的最优接入方式

摘要

随着经济的飞速发展,分布式电源(DG)作为一种新型的、环保的、高效的发电形式越来越受到关注.文章重点分析研究了分布式电源并网对传统配电网电流保护的影响,利用PSCAD/EMTDC仿真软件验证了分布式电源不同容量,不同接入位置对配电网各段电流保护的不同影响,提出了一种对配电网特定区段产生最小短路电流的接入方法.在分析DG并网对短路电流产生助增及汲流作用的基础上,提出一种对特定段电流保护无影响的最优接入方式,并通过理论分析跟建模仿真验证了该方法的正确性.对DG接入条件一定的情况下,提出了一种新的并网原则,对DG并网具有一定的参考意义.%With the rapid development of economy,the distributed power supply (DG) is becoming more and more popular as a new,environmentally friendly and efficient power generation form.This paper focuses on the analysis of the influence of distributed power grid on the traditional current protection of distribution network;the PSCAD/EMTDC simulation software is used to verify the effects of the different distributed power supply capacity and the different access location of each segment current protection in distribution network.It proposed a kind of distribution network specific sector of the access method of minimum short-circuit current.In the analysis of the DG grid based argumentation and drain currents of short-circuit current,this paper puts forward a kind of no effect on the specific segment of the current protection of the optimal access mode,and the correctness of the method is verified by theoretical analysis and simulation modeling.This paper proposes a novel grid-connected law under the certain circumstances of DG access conditions,which provides certain reference for DG grid connection.