Research on optimization of load disturbance performance for isolated AC/DC Matrix converter

Isolated AC-DC matrix converter (IAMC) has the advantages of no intermediate DC link, high power density and bidirectional power flow. In IAMC, the inherent deficiencies in the traditional voltage-current dual closed-loop control structure and the existence of a certain hysteresis in the PI regulator make it difficult for IAMC to obtain good dynamic performance under disturbances. In this paper, we propose a composite control method based on the combination of dynamic current feedforward decoupling compensation and second-order linear active disturbance rejection control (LADRC), which introduces the dynamic equivalent current feedforward and decoupling optimization compensation in the current loop, and uses the second-order LADRC to replace the traditional PI controller in the voltage loop, which can effectively reduce the amplitude of voltage oscillation of the dc-bus voltage during the load disturbances, and enhance the dynamic performance of the system, and finally, a simulation model is built in Matlab/Simulink, and the simulation results verify the feasibility and effectiveness of the proposed method in the paper.