基于重复控制的改进电压谐波线性自抗扰控制研究OA北大核心CSTPCD

When the microgrid containing hydrogen fuel cells operates in isolated islands,the ideal control effect cannot be achieved only by using the virtual synchronous generator(VSG)control technology as the outer ring.The introduction of linear active disturbance rejection control(LADRC)improves the anti-interference ability of the microgrid system.However,the linear extended state observer(LESO)in the traditional LADRC only has the ability to observe the step signal,while the nonlinear disturbance requires the system to track and suppress the periodic signal.Therefore,this paper proposes an improved LADRC strategy based on repetitive control.By using the characteristics of repetitive control to track and compensate for periodic input signals and disturbances with zero error,repetitive control is introduced into the LESO of LADRC to improve the observation performance of the system.Through comparing and analyzing the error transfer function Bode diagrams of LESO and LESO based on repetitive control respectively,the paper verifies the advantage of the proposed strategy for restraining nonlinear disturbance using MATLAB/SIMULINK simulation platform.