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针对目前多馈入直流输电系统中换相失败研究主要采用仿真手段的情况,基于最小熄弧角判断标准,推导多馈入直流系统中当地换相失败免疫因子和同时换相失败免疫因子的解析表达式.通过表达式可快速而有效地确定系统参数对多馈入直流系统中逆变站换相失败免疫水平的影响:当地换相失败免疫因子与故障交流系统有效短路比具有近似的线性关系;在临界多馈入交互作用因子不变时,同时换相失败免疫因子与故障交流系统有效短路比成正比关系,与多馈入交互作用因子成反相关.基于CIGRE直流输电标准模型搭建了双馈入直流输电系统,仿真结果验证了表达式的有效性和准确性.“,”In view of the fact that commutation failures of multi-infeed HVDC systems are mainly analyzed under simulation tools at present, the analytical expressions of local commutation failure immunity index (LCFII) and concurrent commutation failure immunity index (CCFII) were derived based on the minimum extinction angle criteria. Using these expressions, the impacts of system parameters on commutation failure immunity levels in the inverter side can be determined quickly and effectively. LCFII is approximately proportional to effective short circuit ratio (ESCR) of the faulted AC system. With the critical multi-infeed interaction factor (CMIIF) unchanged, CCFII is proportional to ESCR of the faulted AC system and has a negative correlation with multi-infeed interaction factor (MIIF). The simulation results of a dual-infeed HVDC system proved the validity and accuracy of the obtained expressions.