含多光伏配电网的分区域三段式电流保护方案  

Partitioned Three-stage Current Protection Scheme of Distribution Network with Multi-photovoltaic Connections

作　　者：张猛 邱惠 赵一萌 陈红坤[2] ZHANG Meng;QIU Hui;ZHAO Yimeng;CHEN Hongkun(State Grid Hubei Electric Power Company Limited Ezhou Power Supply Company,Ezhou 436060,China;Hubei Engineering and Technology Research Center for AC/DC Intelligent Distribution Network,School of Electrical Engineering and Automation,Wuhan University,Wuhan 430072,China)

机构地区：[1]国网湖北省电力有限公司鄂州供电公司,鄂州436060 [2]武汉大学电气与自动化学院交直流智能配电网湖北省工程中心,武汉430072

出　　处：《自动化与仪表》2025年第4期11-15,108,共6页Automation & Instrumentation

基　　金：国网科技项目(SGHBEZ00DKJS2200710)。

摘　　要：针对光伏接入10 kV配电网后传统三段式电流保护无法正确动作的问题,首先对不同条件下多光伏接入对故障电流的影响进行了讨论。对于保护无法正确动作和灵敏度下降的问题,提出了一种适用于多光伏接入的分区域三段式电流保护方法,即针对线路的不同区域采用不同的三段式电流保护方法,结合通讯手段和本地信息对整定值进行调整,使其满足继电保护的四性。最后在MATLAB/Simulink环境中搭建仿真模型验证所提方案的准确性。仿真结果表明,所提出的方法能使三段式电流保护正确动作且灵敏度满足要求,有效改善多光伏接入后的配电网保护性能。For the problem that the traditional three-section current protection cannot operate correctly after PV access to the 10 kV distribution network,this paper firstly discusses in detail the impact of multi-PV access on fault current under different conditions.For the problems of protection not being able to act correctly and sensitivity degradation,a three-stage current protection method applicable to multi-PV access is proposed for the subregion,by which different three-stage current protection methods are adopted for different areas,and it combines with the means of communication and local information to adjust the setting value so as to meet the quadratic nature of relay protection.Finally,a simulation model is built in MATLAB/Simulink environment to verify the accuracy of the proposed scheme.The simulation results show that the method proposed in this paper can make the three-stage current protection operate correctly and the sensitivity meets the requirements,which can effectively improve the protection performance of the distribution network after multi-PV access.

关 键 词：三段式电流保护 实时整定 自适应电流保护 光伏电源 低电压穿越 配电网 灵敏度提升 

分 类 号：TM77[电气工程—电力系统及自动化] TM615