Sensitivity Analysis-based Control Parameters Optimization for MMC-based DC Distribution Systems

This paper proposes a novel control parameters optimization method to enhance the dynamic performance of MMC-based DC distribution systems. The small signal model of DC distribution systems consisting of MMC main circuits, control systems, AC systems, and DC system is established. The participation factor analysis shows that the small signal stability of MMC-based DC distribution systems is strongly influenced by the control system. The sensitivity analysis-based control parameters optimization method is proposed to adjusting the control parameters for stability enhancement. The effectiveness of the proposed method is further validated by stability assessment and time-domain simulations on a three-terminal MMC-based DC distribution system.