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中文摘要：
分析了直流输电系统换相失败机理,介绍了多馈入直流（MIDC）输电系统中与换相失败相关的多馈入交互作用因子（MIIF）;通过分析逆变系统运行时与关断角密切相关的系统参数和电气量,归纳了影响直流输电系统换相失败的主要影响因素;介绍了用以判断换相失败的主要判别方法,同时给出了耦合阻抗、MIIF及有效短路比判别MIDC输电系统中不同换流站是否同时发生换相失败的方法;总结了换相失败的抑制措施以及换相失败后系统的恢复策略.
英文摘要：
Abstract：The mechanism of commutation failure in DC transmission system is analyzed and the MIIF （Multi-Infeed Interaction Factor） of MIDC （Multi-Infeed Direct Current） transmission system,relevant to commutation failure,is introduced.The system parameters and electric parameters,closely relevant to the extinction angle in the operation of invert system,are analyzed and the main influencing factors of commutation failure in DC transmission system are summarized.The main methods of commutation failure judgment are introduced and three criteria are given for detecting if commutation failure is synchronously occur in different inverter stations of MIDC transmission system：coupling impedance,MIIF and effective short circuit ratio.The suppression measures and system recovery strategies after commutation failure are summarized.
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