直流输电换流阀杂散电容和冲击电压分布的计算  

Calculation on Stray Capacitances and Impulse Voltage Distribution of HVDC Converter Valve

作　　者：郭焕[1] 汤广福[2] 查鲲鹏[2] 魏晓光[2] 

机构地区：[1]清华大学电机工程与应用电子技术系,北京市海淀区100084 [2]中国电力科学研究院,北京市海淀区100192

出　　处：《中国电机工程学报》2011年第10期116-122,共7页Proceedings of the CSEE

基　　金："十一五"国家科技支撑计划重大项目(2006BAA02A27);国家电网公司科技项目(SGKJ[2007]107)~~

摘　　要：速变电压下的电压分布性能是高压直流输电换流阀的重要电气特性之一,而换流阀的杂散电容是导致速变电压不均匀分布的主要原因,因此对杂散电容的准确计算具有重要意义。提出一套换流阀杂散电容的计算方法,包括窗口截断技术、屏蔽效应和复用技术等。完成了相关理论推导,证明该方法的计算结果比实际电容值更大,结果是趋于保守和可信的。利用场路结合原理建立等效电路,并对冲击电压分布进行了计算。试验和计算结果表明,所提的杂散电容和电压分布计算方法是可行的。The transient voltage distribution performance is one of the key electrical characteristics of HVDC converter valves. Stray capacitances of converter valves are the main factor resulting in uneven distribution of transient voltage, therefore accurate calculation on stray capacitances is of necessity and significance. A set of calculation method was proposed including windowing truncation, shielding effect, reuse technology, etc. Relative theoretical derivations were completed; results showed that the calculated capacitance values are larger than the actual ones, and thus proved to be conservative and credible. Furthermore, based on the field-circuit coupled method, an equivalent circuit for transient voltage was build; and calculation on impulse voltage distribution was performed. Finally, calculation and test results verify the feasibility of the proposed calculation method for stray capacitance and voltage distribution.

关 键 词：高压直流输电 换流阀 杂散电容 电压分布 

分 类 号：TM83[电气工程—高电压与绝缘技术]