Abstract: In order to solve the problem that the uncertain disturbance of microgrid will seriously affect the output power quality of direct-to-direct converter,this paper proposes an active disturbance rejection control technology based on joint correction of model information（ADRC-MIR）. In this control strategy,the disturbance observation transfer function of the linear extended state observer is modified by proportional differential correction based on the idea of series advance correction,so that the total disturbance can be tracked more accurately. Then,part of the model information is extracted from the controlled system according to the state space average method,and written into the coefficient matrix of the modified linear expanded state observer,and finally ADRC-MIR is constructed.Then,based on the theoretical derivation,the parameter setting formula of the improved controller and its physical significance are given,and the reason why the improved controller can improve the control quality is pointed out from the aspects of noise suppression,disturbance suppression and frequency domain characteristics. Finally,the feasibility and correctness of the proposed control strategy are verified by comparing the numerical simulation under different working conditions.