中文摘要：

现有的多馈入短路比的定义无法准确描述含有整流站接入的多馈入系统强度，需要对其进行改进。建立了含有整流站的双馈入测试系统，采用最大功率曲线法，在一系列参数研究的基础上提出了新的多馈入系统有效短路比的定义。通过对处于临界稳定下的的三馈入直流系统以及逆变站过电压计算，验证了新的多馈入系统有效短路比的定义的有效性。

英文摘要：

The existing definition of the multi-infeed effective short circuit ratio （MIESCR） fails to depict the system strength of the multi-infeed system with rectifier stations integrated. To represent this feature, it should be modified. The dual-infeed HVDC test system with the rectifier station connected was established in the work. Based on the maximum power stability curve method, the new definition of multi-infeed effective short circuit ratio was proposed after conducting a range of parametric studies. Using the inverter/rectifier mixed triple-infeed systems in the critical stability and the transient overvoltage （TOV） calculation of the inverter, the effectiveness of the new MIESCR definition was verified.