光伏电站弱电源特性对送出线路继电保护的影响  

Influence of PV station weak power feature on relay protection of outgoing transmission line

作　　者：瞿继平 吴兴全 闫凯[2] 张保会[2] 

机构地区：[1]甘肃省电力设计院,甘肃兰州730050 [2]西安交通大学电气工程学院,陕西西安710049

出　　处：《电力自动化设备》2015年第5期146-151,共6页Electric Power Automation Equipment

摘　　要：光伏电站的弱电源特性会对送出线路现有继电保护的动作性能产生严重影响。研究了光伏发电系统的故障电流特征,分析了弱电源特性对送出线路电流差动保护和距离保护动作性能的影响,基于此指出现有保护配置存在的问题。利用PSCAD上搭建的光伏发电系统电磁暂态模型对理论分析进行仿真验证。理论分析和仿真验证结果都表明,光伏电站弱电源特性会造成送出线路的光伏侧电流保护不能启动、差动电流保护灵敏度下降以及距离保护误动和拒动。最后给出了光伏电站送出线路保护配置的建议。Since the weak power feature of PV（PhotoVoltaic） power station has a serious impact on the operation performance of existing relay protections for outgoing transmission lines, the fault current characteristic of PV power generation system is studied and the influence of weak power feature on the differential current protection and distance protection of outgoing transmission lines is analyzed,based on which,the problems of present protection configuration are pointed out. The theoretical analysis is verified by the simulation based on the PV electromagnetic transient model built with PSCAD. Both the theoretical analysis and the simulative results show that,at the PV side of outgoing transmission lines,the weak power feature of PV power stations may cause the operation rejection of current protection,the improper operation of distance protection and the sensitivity fall of current differential protection. The protection configuration for the outgoing transmission lines of PV power station is suggested.

关 键 词：光伏电站 故障特征 送出线路 弱电源特性 继电保护 故障分析 差动保护 距离保护 

分 类 号：TM73[电气工程—电力系统及自动化]