换流站交流滤波器C_1电容器不平衡保护定值研究  

Study on Imbalance Protection Setting of Capacitor C_1 in AC Filter at Converter Station

作　　者：窦如婷[1] 李豹[2] 

机构地区：[1]中国能源建设集团广东省电力设计研究院,广东广州510663 [2]中国南方电网超高压输电公司广州局,广东广州510405

出　　处：《电力电容器与无功补偿》2014年第6期19-23,共5页Power Capacitor & Reactive Power Compensation

摘　　要：不平衡保护是高压换流站交流滤波器C1电容器的主保护。介绍了C1不平衡保护的双向计数原理,对电容器故障后元件过电压情况进行计算分析。结合计算结果和C1不平衡保护跳闸统计分析,对保护分段动作定值进行研究,发现目前的保护定值不利于交流滤波器的可靠运行,且使得II段保护出口的设置失去了意义。通过对电容器元件过电压性能的分析,结合交流滤波器的实际运行经验,分别给出II段、III段保护定值的调整建议,调整后的保护定值可以很好地体现保护的分段动作逻辑,减少交流滤波器跳闸事故的发生。Imbalance protectiom is the main protection of capacitor C1 in AC filter of high voltage converter station.In this paper,bi-directional counting principle of C1 imbalance protection is introduced and the overvoltage of elements after the fault of capacitor is calculated and analyzed.The operaion setting of the protection section is studied based on the calculation result and tripping statistical analysis of C1 imbalance protection.It is found that the current protection setting is not favaourable for reliable operation of AC filter and would make output of segment Ⅱ protection out of function.The adjustment suggestion about setting of section Ⅱ and Ⅲ is given respectively throughtout overvoltage performance analysis of capacitor elements and with combination of actual operation experience of AC filter.The protection setting after adjustment can reflect very well section action logic and reduce the AC tripping accidents of AC filter.

关 键 词：交流滤波器 C1不平衡保护 双向计数 过电压分析 保护定值 

分 类 号：TM721.1[电气工程—电力系统及自动化]