基于电流的静止无功补偿装置电容器过电压保护  

Current-based Capacitor Overvoltage Protection of Static Var Compensator

作　　者：丁力[1] 陈建松 DING Li;CHEN Jiansong(Nanjing NR Electric Co.,Ltd.,Nanjing 211102,China)

机构地区：[1]南京南瑞继保电气有限公司,江苏南京211102

出　　处：《电工技术》2024年第9期118-121,共4页Electric Engineering

摘　　要：针对串联电抗器的静止无功补偿装置中电容器两端未安装电压互感器导致不能精准实现电容器过电压保护的问题,提出了一种基于电流的并联电容器谐波过电压保护方法。首先,采集电容器两端的电流,利用傅里叶算法计算各次谐波电流;其次,推导电容器基波、谐波电流与电压的关系,依据所推导公式计算电容器两端各次谐波电压;最后,通过仿真软件对文中推导公式进行验证,并阐述了继电保护装置实现电容器谐波过电压保护的方法。结果证明该方法理论推导与实际仿真结果相符,提高了电容器过电压保护可靠性。In static var compensators with series reactors,there is installed no voltage transformer at both ends of capacitors,resulting in inadequate accuracy in capacitor overvoltage protection.To address this problem a current-based harmonic overvoltage protection for shunt capacitors is proposed.First the currents of the capacitors are measured to calculate the harmonic currents by Fourier algorithm.Second the relationship between fundamental wave,harmonic current,and voltage of capacitors is derived,and the harmonic voltages of the capacitors are caculated based on derived formulas.Finally the derived formulas are verified through simulation software,and the method of realizing capacitor harmonic overvoltage protection by digital relay is explained.The results show that the theoretical derivation of this method is consistent with the actual simulation results,and it improves the reliability of capacitor overvoltage protection.

关 键 词：静止无功补偿装置 过电压保护 并联电容器 谐波电压 电抗器 

分 类 号：TM53[电气工程—电器]