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中文摘要：
逆变器的换相失败是高压直流输电系统的一种常见故障。为研究多馈入系统中换相失败的复杂机理，文中应用PSCAD／EMTDC电磁暂态仿真软件，在经典双馈入系统模型中进行仿真，根据换相失败发生的风险指标-短路严重程度等级因子，分析造成直流系统换相失败的概率特征。发现多馈入电压交互作用与谐波交互作用是影响多馈入系统同时换相失败的两个重要因素，故障较弱时，多馈入系统的远端换相失败主要与换流母线电压的波形畸变相关；而故障较强时，母线电压的幅值跌落是导致远端换相失败发生的主因，仿真结果证明了结论的正确性。
英文摘要：
Commutation failure in inverter is one of the most frequent faults in HVDC system. To study the complex mechanism of commutation failure in muhi-infeed systems, this paper carries out the simulation in classical models for double-infeed systems. By using PSCAD/EMTDC, the probability characteristics of commutation failure is analyzed, which is based on the risk index short level index. It turns out that MIIF and harmonic are two important factors to influence commutation failure. When fault is low, successive commutation failure is mainly resulted from distortion of commutation voltage caused by harmonic. When fault is high, voltage reduction is the key factor. Simulation results show the accuracy of the criteria.
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