主动配电网智能分布式馈线自动化故障定位方法

摘要

With the high penetration of distributed generators (DGs),the radial structure of conventional distribution system will change to multi-terminal type.Influenced by the short-circuit current injected from distributed generators,fault location scheme for distribution network based on over current protection may be invalid.The fault current characteristics for active distribution network is investigated,and the relationship between the differences of current phase and fault location is found,a novel distributed feeder automation (FA) fault location method of active distribution network is presented.With this method,each terminal excutes distribued calculation according to the fault over-current and current phase of the terminal itself and neighboring terminal to achieve fault location.This method is applicable for complex active distribution network with multi-source,multi-branch and multi-contact,and it can locate the fault exactly since it does not depend on voltage and each terminal uses distributed decision.Finally,the feasibility and effectiveness of the proposed method is verified by DIgSILENT simulation analysis and engineering example.%随着分布式电源的高渗透率接入,配电网的结构由传统的辐射型变成了一个多端电源结构.受分布式电源注入短路电流的影响,传统的基于过流保护的配电网故障定位方案可能失效.通过研究主动配电网故障电流的特性,得出了电流相位差与故障位置的关系,提出了一种新型的主动配电网分布式馈线自动化(feeder automation,FA)故障定位方法,各终端根据自身和相邻设备的故障过流信息及故障电流相位进行分布式计算,共同实现主动配电网的故障定位.该方法适用于多电源、多分支、多联络的复杂主动配电网,且不依赖于电压信息,各终端采用分布式决策,故障定位准确.最后利用DIgSILENT仿真与工程实例验证了本文所提故障定位方法的可行性与有效性.