大容量可控电抗器对线路差动保护的影响及解决措施  

Impact of Large-capacity Controllable Shunt Reactor on Line Differential Protection and Solutions

作　　者：张健康 粟小华 胡勇 杜丁香[2] 

机构地区：[1]国家电网西北电力调控分中心,陕西省西安市710048 [2]中国电力科学研究院,北京市100192

出　　处：《电力系统自动化》2014年第1期115-120,共6页Automation of Electric Power Systems

摘　　要：大容量可控电抗器等柔性交流输电系统(FACTS)设备已应用于新疆与西北联网750kV第二通道输变电工程。电容电流是影响超高压长线路差动保护性能的主要因素,需计算出分布电容电流和并联电抗器电流后进行补偿。由于可控电抗器在运行中容量是变化的,根据电抗器参数间接计算电流的做法会造成过补偿或欠补偿。为此,提出将可控电抗器实测电流引入线路差动保护,以实现电容电流的精确补偿,并分析了应用中需注意的问题。最后,采用数模试验验证了理论分析的有效性。新方法提高了差动保护的灵敏性和可靠性,已在新疆与西北联网工程中获得成功应用。Large-capacity controllable shunt reactor（CSR）has been applied to the 750kV northwest 2nd power transmission channel project.Capacitive current is the main factors affecting the performance of differential protection used for extra high voltage（EHV）long line,and distributed capacitive current and shunt reactor current should be calculated and compensated completely.As the capacity of CSR is greatly variable in operation,the practice of indirect calculation of CSR current with its parameters will result in over-compensation or under-compensation.To achieve accurate compensation results,the CSR current is directly introduced into line protection.The problems for attention in engineering application are discussed as well.Digital simulation test is performed to verify the validity of theoretical analysis.This method has improved the sensitivity and reliability of line protection and is successfully used in real projects.

关 键 词：继电保护 差动保护 可控电抗器 电容电流补偿 

分 类 号：TM47[电气工程—电器] TM773