含分布式电源的配电网继电保护优化方案研究  

Research on the improvement scheme of relay protection scheme of distribution network with distributed power supply

作　　者：许耀琦 唐萃 陈天成 徐琪 刘健[1] XU Yaoqi;TANG Cui;CHEN Tiancheng;XU Qi;LIU Jian(School of Electrical and Information Engineering,Wuhan Institute of Technology,Wuhan 430205,China)

机构地区：[1]武汉工程大学电气信息学院,湖北武汉430205

出　　处：《电气应用》2024年第11期60-66,共7页Electrotechnical Application

基　　金：武汉工程大学科学研究基金项目(K201906)。

摘　　要：目前,电力系统正处于能源转型的关键时期,大量可再生能源以分布式发电的形式并网,改变了配电网原有的系统结构,可能导致线路中原有的保护装置产生误动作。基于PSCAD/EMTDC仿真软件,对含分布式电源(DG)的配电网故障特性及保护问题进行仿真研究。根据DG并网对配电网故障电流的影响,提出一种保护改进方案。该方案采用两侧电流相角变化量作为故障定位的依据,能保证保护装置的正确动作,最后通过仿真实验证明其可行性,该方案适用于两侧均有电源供电的线路。Currently,the power system is in a critical period of energy transformation.A large amount of renewable energy is connected to the grid in the form of distributed power generation,which changes the original system structure of the distribution network and may cause the original pro-tection devices in the line to malfunction.Based on PSCAD/EMTDC simulation software,this paper conducts simulation research on fault characteristics and protection problems of distribution net-work with DG(Distributed Generation).According to the influence of DG grid connection on the fault current of distribution network,propose an improved protection scheme for DG distribution networks.This scheme uses the phase angle change of the current on both sides as the criterion to locate the fault,which can ensure the correct operation of the protection device.Finally,the simulation experiment proves its feasibility.This scheme is applicable to the lines with power supply on both sides.

关 键 词：分布式电源 故障特性 相角变化 保护算法 仿真验证 

分 类 号：TM77[电气工程—电力系统及自动化]