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中文摘要：
建立了2条交、直流并联的多馈入高压直流输电系统模型，并对此模型的直流输电线的耦合导纳和换相失败关系进行详细的理论分析研究。基于电路基本理论知识，推导出多馈入交、直流并联的高压直流输电系统耦合导纳和换相电压关系表达式。从该文的理论分析可看出逆变侧换相失败的判断与耦合导纳关系十分复杂，它不仅与各直流输电子系统逆变侧相连的交流电源的等值导纳有关，而且还与各直流输电子系统整流侧相连的交流电源的等值导纳有关，更与各直流输电子系统相并联的交流传输线导纳密切相关。
英文摘要：
A multi-infeed HVDC system model including AC/DC parallel lines was established, and the relation between its mutual admittance and converter commutation failure was analyzed. Based on electrical circuit theory, the formulation of the relation between mutual admittance and converter commutation voltage of the multi-infeed HVDC system was given. Study shows that the relationship is complex, which is not only related to the equivalent admittance of ac source at each inverter and converter ends, but also the admittance of the parallel ac lines.
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