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传统的多馈入短路比计算方法耗时太长,无法满足自适应解列断面搜索时对电网快速分析决策的要求.在此背景下,本文提出了一种适用于交直流电网自适应解列后孤岛的多馈入短路比快速计算方法.在已知解列前交直流电网阻抗矩阵、换流母线额定电压、各直流额定功率和自适应解列断面的条件下,基于多馈入短路比的定义式,采用支路追加法迅速修正部分阻抗矩阵元素,最终求得解列后含直流落点的孤岛多馈入短路比.新英格兰10机39节点系统及广东电网仿真结果证明了本方法的可行性.与传统方法相比,本文所提的方法计算速度更快、效率更高.“,”It is time consuming for traditional multi-infeed short circuit ratios (MSCRs)calculation method,which can not meet the requirement of fast analysis and decision-mak-ing of power grid when searching controlled islanding sur-faces.In this context,a fast MSCRs calculation method that is applicable for islanded sub-system with multiple infeed HVDC lines of AC/DC power grid is proposed.It is as-sumed that the impedance matrix of AC power grid,the ra-ted voltage of commutation bus bar,the rated DC power and the candidate system islanding strategy are known,then branch addition method is used to correct partial elements of impedance matrix rapidly,and the MSCRs of islands with the receiving end of HVDC lines are calculated according to the definition of MSCRs.The simulation results of New England 10-machine-39-node system and the Guangdong power grid prove the feasibility of this method.Compared with the traditional method,the proposed method is faster and more efficient.