中文摘要：

从多馈入直流系统功率稳定性角度出发,基于两馈入直流输电系统简化模型,研究了多馈入直流系统功率稳定性与多馈入有效短路比之间的定量关系。分析结果表明：多馈入有效短路比不能完全反映直流系统的功率稳定性,两者之间难以建立明确的定量关系;当受端电网直流馈入数较多时,各回直流系统的临界多馈入有效短路比将可能远小于1.5。

英文摘要：

From the perspective of the power stability of multi-infeed HVDC system,based on the simplified model of a two-infeed HVDC system,the quantitative relationship between the power stability of multi-infeed HVDC system and the MIESCR（Multi-Infeed Effective Short Circuit Ratio） is studied,which reveals that,the MIESCR could not completely reflect the power stability of HVDC system and it is difficult to set a quantitative relationship between them.When multiple HVDC links terminate at one AC system,the CMIESCR（Critical Multi-Infeed Effective Short Circuit Ratio） of each HVDC link may become much less than 1.5.