并网光伏电站中性点接地电阻选择与零序保护  

Neutral grounding resistance selection and zero-sequence protection for grid connected photovoltaic power station

作　　者：李政 卢继平[1] 刘加林 何潜 LI Zheng;LU Jiping;LIU Jialin;HE Qian(State Key Laboratory of Power Transmission Equipment&System Security and New Technology,School of Electrical Engineering,Chongqing University,Chongqing 400044,China;State Grid Chongqing Electric Power Company,Chongqing 401120,China)

机构地区：[1]重庆大学 电气工程学院 输配电装备及系统安全与新技术国家重点实验室,重庆 400044 [2]国网重庆市电力公司,重庆 401120

出　　处：《电力自动化设备》2019年第12期49-55,147,共8页Electric Power Automation Equipment

基　　金：国家自然科学基金资助项目(51577018)

摘　　要：在保障人身和设备安全的前提下,基于零序电流随中性点电阻的变化特性分析,综合站内各级线路零序保护的选择性和灵敏性要求,提出了一种计及光伏源非线性助增和保护动作性能的中性点接地电阻选取方法。针对保护的不同配置,该方法都可以得到兼顾一次系统安全和二次保护性能的电阻取值。最后通过实际工程算例,给出了详细的电阻选择及保护整定方案,验证了所提方法的正确性和可行性。Under the premise of ensuring the safety of person and equipment,based on the analysis of the variation characteristics of zero-sequence current with neutral grounding resistance,and combining with the selectivity and sensitivity requirements of zero-sequence protection of all levels of lines in the station,a method for selecting neutral grounding resistance considering the nonlinear boosting of the photovoltaic source and the performance of protection action is proposed.For different configurations of protection,the proposed method can obtain the resistor value considering both primary system security and secondary pro?tection performance.Through the actual engineering examples,the detailed resistor selection and protection setting schemes are given,and the correctness and feasibility of the proposed method are verified.

关 键 词：光伏电站 中性点接地电阻 零序电流特性 光伏非线性助增 继电保护 保护动作性能 

分 类 号：TM615[电气工程—电力系统及自动化] TM771