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.

• 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。