变电站并联电容器组配置及分闸过电压的仿真分析  

Configuration of Shunt Capacitor Bank in Substation and Simulation of Opening Overvoltage

作　　者：王继隆 李盛伟 王楠 高宇 WANG Jilong;LI Shengwei;WANG Nan;GAO Yu(School of Electrical and Information Engineering,Tianjin University,Tianjin 300072,China;Economic and Technological Research Institute,State Grid Tianjin Electric Power Company,Tianjin 300010,China)

机构地区：[1]天津大学电气自动化与信息工程学院,天津300072 [2]国网天津市电力公司经济技术研究院,天津300010

出　　处：《电力系统及其自动化学报》2019年第1期58-64,共7页Proceedings of the CSU-EPSA

摘　　要：并联电容器组是电网中重要的无功电源,用于提高电网功率因数、维持较高质量的运行电压、降低输电过程中电网有功功率损耗从而确保电网安全稳定的运行。本文采用国际通用的电力系统暂态分析程序EMTP/ATP计算了天津某110 kV变电站的并联电容器组分闸过电压。分析了在考虑并联电容器组断路器不同期分闸前提下,单独改变一组电容器组参数情况下对该组电容器组分闸过电压的影响。给出适合于天津电网具体情况的并联电容器组单组投合容量合理范围。结果表明,同一电抗率下,每相电容越大流经电容器组每相的氧化锌避雷器能量越大,最终甚至会烧坏避雷器。A shunt capacitor bank is one important reactive power supply in power grid , which is often used to improve the power factor of power grid , maintain the operating voltage at a higher-quality level , and cut down the active power loss during power transmission , thus guaranteeing a safe and stable operation of power grid. In this paper , the opening overvoltage of a shunt capacitor bank in a 110 kV substation in Tianjin is calculated by utilizing the widely used electro-magnetic transients program/ alternative transients program ( EMTP/ATP ). Under the premise of different opening time of circuit breakers in the shunt capacitor bank , the effect of changing the parameters of only one capacitor bank on the opening overvoltage of this bank is analyzed. Moreover , the reasonable range of the switching capacitance of one single bank in the shunt capacitor bank , which is suitable for Tianjin power grid in practice , is given. The result shows that the energy flowing through the ZnO surge arrester of capacitor bank in every phase will increase with the growth of ca-pacitance in every phase , eventually breaking the surge arrester.

关 键 词：并联电容器组 分闸过电压 EMTP/ATP 金属氧化物避雷器 

分 类 号：TM72[电气工程—电力系统及自动化]