Inertia control and dynamic performance optimization of interlinking converter based on parameter adaptation

Abstract

Given the lack of inertia of interlinking converter and the poor transient performance of traditional virtual synchronous generator (VSG) control, a parameter adaptive control strategy for interlinking converter is proposed in this paper. This strategy can reduce the overshoot of the AC frequency and effectively improve the dynamic performance of the AC/DC hybrid microgrid. In this paper, based on the power balance of the AC/DC hybrid microgrid interface, the coupling relationship between the AC frequency and the DC voltage is derived, and the influence of the coupling coefficient on the transient and steady-state performance of the system is analyzed. On this basis, the coupling coefficient is adaptively changed, the overshoot of the AC frequency is reduced, the system's inertia is increased, and the system's dynamic performance is improved. Finally, the AC/DC hybrid microgrid model is built through Matlab/Simulink, and the correctness and effectiveness of the strategy are verified by simulation.