新能源并网对配电系统继电保护影响分析
薛风华1，张文远1，王 小光1，沈岳峰2
（1 国网宿迁供 电公司， 江苏 宿迁 223800；2 南京理工大学 自动化学院，江苏 南京 210094）
摘 要：以光伏电源接入配电网为研究对象，通过等效思想理论分析光伏电源并网对配电系统继电保护影响，在Matlab/Simulink中建立了光伏并网系统及配电网模型，仿真结果表明，系统电源侧及光伏电源所在馈线上游发生短路故障对配电网继电保护装置无影响；所在馈线下游发生短路故障使得上游短路电流减小，导致继电保护拒动作，下游短路电流增大，导致继电保护误动作；相邻馈线发生短路故障对该馈线继电保护无影响，使光伏电源所在馈线上游短路电流增大，导致继电保护误动作，验证了理论分析的准确性。
关键词：光伏电源；配电网；继电保护；Matlab/Simulink仿真
中图分类号：TM773 文献标识码：A 文章编号：1007-3175(2017)09-0015-04
Analysis of New Energy Resources Grid Connected Impact on Relay Protection of Distribution System
XUE Feng-hua1, ZHANG Wen-yuan1, WANG Xiao-guang1, SHEN Yue-feng2
（1 State Grid Suqian Power Supply Company, Suqian 223800, China;
2 School of Automation, Nanjing University of Science and Technology, Nanjing 210094, China）
Abstract: Taking the photovoltaic (PV) power supply connected to distribution network for research objects, this paper analyzed the influence of grid-connected PV power system on the relay protection of distribution system via the equivalent thoughts and theories, and established the grid-connected PV power system and distribution network model in Matlab/Simulink. The simulation results show that the short-circuit faults happening at the system power supply side and on the feeder upstream of PV power supply have no impact on the relay protection of distribution network, while the short-circuit faults happening on the feeder downstream make the short-circuit current on the feeder upstream decrease to give rise to the relay protection failure action, so as to increase the short-circuit current on the feeder downstream to give rise to the relay protection malfunction. The short-circuit faults happening on the adjacency feeder have no impact on the feeder relay protection and makes the short-circuit current on the feeder upstream of PV power supply increase to give rise to the relay protection malfunction, which verifies the accuracy of theoretical analysis.
Key words: photovoltaic power supply; distribution network; relay protection; Matlab/Simulink simulation
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