光伏并网对配电网继电保护影响特性分析  

Analysis of the impact characteristics of photovoltaic grid connection on distribution network relay protection

作　　者：王磊磊 李明 刘兴华 吴飞 禹建锋 杨帆 WANG Leilei;LI Ming;LIU Xinghua;WU Fei;YU Jianfeng;YANG Fan(State Grid Shandong Electric Power Company Zibo Power Supply Company,Zibo 255000,China;State Grid Shandong Electric Power Company,Jinan 250001,China)

机构地区：[1]国网山东省电力公司淄博供电公司,山东淄博255000 [2]国网山东省电力公司,山东济南250001

出　　处：《电气应用》2024年第9期84-89,共6页Electrotechnical Application

摘　　要：光伏发电因其供电可靠性高且投资成本低的特征被广泛应用于发电产业,随着光伏并网规模不断增大,传统的继电保护特性发生改变,原有继电保护方案不再能够满足电网安全运行的要求。对光伏发电的基本特点进行分析。首先,分析了光伏并网前后各位置保护电流的变化特性。然后,基于故障工况分析了光伏并网后保护电流的变化对继电保护正确动作造成的影响,并分析了不同容量光伏电源并入工况下的保护电流变化特性。最后,基于MATLAB仿真软件对前述分析进行仿真验证,结果充分证明理论分析的正确性,研究成果对优化继电保护动作具有指导意义。Photovoltaic power generation is widely used in the power generation industry due to its high power supply reliability and low investment cost.With the continuous increase of photovoltaic grid connection scale,traditional relay protection characteristics have changed,and the original relay protection scheme can no longer meet the requirements of safe operation of the power grid.Therefore,this article analyzes the basic characteristics of photovoltaic power generation.Firstly,the variation characteristics of protection currents at various positions before and after photovoltaic grid connection were analyzed;Subsequently,based on the fault conditions,the impact of changes in protection current after photovoltaic grid connection on the correct operation of relay protection was analyzed,and the characteristics of protection current changes under different capacity photovoltaic power supply integration conditions were analyzed.Finally,the above analysis was validated through simulation using MATLAB simulation software.The results fully demonstrate the correctness of theoretical analysis,and the research results have guiding significance for optimizing relay protection actions.

关 键 词：继电保护 光伏并网 故障电流 接地短路 容量大小 

分 类 号：TM77[电气工程—电力系统及自动化] TM615