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中文摘要：
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。
英文摘要：
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.
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