基于阻抗灵敏度的MMC稳定性主导影响因素分析OA北大核心CSTPCD

Since the broadband resonance problem in a modular multilevel converter(MMC)is becoming increasingly prominent and involves many influencing factors,it is difficult to quantitatively determine the dominant factors in the broadband through the analysis of participation factors.To solve this problem,an analysis method for the absolute and per-unit sensitivity of MMC impedance is proposed in this paper,which can realize the quantitative study of dominant factors of broadband resonance and reduce the resonance risk of MMC.First,a broadband impedance model of MMC is established,and the absolute sensitivity analysis of delay link and current control parameters is carried out to reflect the trend of influence of changes in parameters on system stability.Then,the influence of dimension between various fac-tors is eliminated by the per-unit normalization of sensitivity,and the dominant factors of stability of MMC interconnect-ed system in each frequency band are obtained.Finally,the theoretical analysis is verified by a simulation model built on the Matlab/Simulink platform.