DC voltage control strategy based on active disturbance rejection control for active power filter

As one of the most effective means to eliminate the harmonic interference on the grid side, the study and application about active filter has drawn more and more attention. It is necessary to ensure the active power filter DC capacitor voltage stability for the Active Power Filter efficiently and accurately operation while compensating the harmonics of the power grid. In this paper, a voltage control strategy based on Active Disturbance Rejection Control for the stabilization of the DC side capacitor voltage is proposed, and the design methods of the tracking differentiator, nonlinear feedback unit and extended state observer are given. This DC voltage control strategy improves the response speed, reduces the overshoot and improves the control precision of the DC capacitor voltage. MATLAB/Simulink is used for modeling, simulating and analyzing of the proposed control strategy. The simulation results prove the feasibility and stability of the strategy.