电压源换相高压直流输电系统接地方式设计  

Grounding Design Analysis of VSC-HVDC System

作　　者：杨杰[1] 郑健超[2] 汤广福[2] 贺之渊[2] 

机构地区：[1]清华大学深圳研究生院,广东省深圳市518055 [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》2010年第19期14-19,共6页Proceedings of the CSEE

基　　金：国家自然科学基金项目(50777058)~~

摘　　要：针对电压源换相高压直流输电(voltage sourceconverter based HVDC,VSC-HVDC)系统分析了其不同接地方式的优劣性。通过建立VSC-HVDC的电磁暂态模型,对不同接地方式下的系统稳态谐波性能、内部交流母线故障特性以及直流线路故障特性进行了详细的仿真研究,并深入分析了故障机制。通过比较不同接地方式下的系统稳态及暂态工况,分析了不同接地方式的优劣性。作为结论,提出了滤波器中点连接于直流电容中点,同时直流电容中点通过高阻接地的VSC-HVDC系统接地配置方案对于提高系统的稳态及暂态性能是有利的。The superiority-inferiority of different grounding methods for voltage source converter based HVDC （VSC-HVDC） system has been analyzed. By establishing an electromagnetic transient model through PSCAD/EMTDC software, the harmonic performance under steady state, characteristics of internal ac bus fault and dc transmission line fault have been simulated and thoroughly investigated. According to the characteristics under steady state and transients, the superiority-inferiority of various grounding design methods has been summarized. As a conclusion, connecting the ac filter neutral point and dc capacitor midpoint together with the latter one grounded by high impedance is more advantageous for performance improvement.

关 键 词：电压源换相高压直流输电 接地方式 零序通路 故障恢复 大地回路 

分 类 号：TM86[电气工程—高电压与绝缘技术] TM721