HVDC系统换相失败的临界指标  

Research on Critical Index of Commutation Failure in HVDC System

作　　者：刘建[1] 李兴源[1] 吴冲 艾飞[1] 

机构地区：[1]四川大学电气信息学院,四川省成都市610065 [2]西南电力设计院,四川省成都市610021

出　　处：《电网技术》2009年第8期8-12,共5页Power System Technology

基　　金：国家重点基础研究专项经费项目(2004CB217901);“十一五”国家科技支撑计划资助项目(2008BAA13B01);国家自然科学基金资助项目(50595412)~~

摘　　要：在电阻性、电感性和电容性条件下,给出了直流系统逆变侧发生单相和三相接地故障时换相失败免疫因子(commutation failure immunity index,CFII)的分布情况。提出了用优化仿真模块快速确定某一故障时刻点换相失败临界阻抗的方法。根据计算得出的CFII分析了直流系统降压运行和降功率运行对换相失败的影响,探讨了交流系统强度与换相失败的关系以及多馈入系统中耦合阻抗与临界当地换相失败风险、临界同时换相失败风险的关系。The distribution of commutation failure immunity index （CFII） is given while single-or＇ three-phase grounding fault happens in AC system at inverter side of HVDC power transmission system, and a method to quickly determine the critical impedance by optimal simulation module at a certain time point when commutation failure occurs is proposed. According to the calculated CFII, the affects of reduced-voltage operation and reduced-power operation of HVDC power transmission system on commutation failure are analyzed, the relation between the strength of AC system and commutation failure is analyzed and the relation among coupling impedance of multi-infeed HVDC power transmission, the risk of critical local commutation failure and the risk of critical simultaneous commutation failure is also researched.

关 键 词：换相失败 免疫因子 临界阻抗 最优仿真 耦合阻抗 

分 类 号：TM721.1[电气工程—电力系统及自动化]