Application of auto-disturbance rejection control for a shunt hybrid active power filter

To eliminate the total disturbance effect to the active power filter (APF) performance, a new nonlinear control method called auto-disturbance rejection control (ADRC) is proposed. The unique feature of ADRC controller is that it has strong robustness, stability and adaptability against the internal perturbation and external disturbance. The control theory, structure of ADRC are presented, the controller design is based on the proposed APF model. MATLAB/Simulink is used for modeling, simulation and analysis of the dynamic system. The simulation and experiment results prove that the proposed APF system can compensate the different kinds of loads; unity power factor and low input current distortion can be realized. In addition, the control system has simple structure, which can eliminate the need of sensing the three-phase load current and calculating the harmonics and reactive current components. The proposed system has a theoretical and practical significance.