In view of such problem as overshoot and static difference in DC voltage control of active power filter（APF）

a kind of new APF DC-side voltage control strategy based on auto disturbance rejection controller is proposed to set up model on the power exchange at both AC and Dc side of APF and analyze the effect of the active component change on the DC side voltage in the dq coordinate system.The parameter adaptive PI controller is used to replace the tracking differential unit commonly used in the transition process

and the second-order extended state observer is designed and the error feedback unit is linearized.It is shown by the simulation and experimental verification that the proposed control strategy can effectively solve the problem of overshoot and static difference in APF DC side voltage control

and effectively improve the response speed and robustness of the system.It has broad application value.