Study of the Control Strategy of a Three-Phase Three-Wire Shunt Power Active Filter

This paper analyses the advantages and disadvantages of common APF control strategies, selects the three-phase, three-wire APF as the research object, and proposes a variable structure current tracking control strategy based on input-output linearization and a DC voltage stabilization control strategy based on higher-order sliding mode control (HOSMC) based on the analysis of its basic structure and harmonic compensation principle, analyses the control of the DC voltage controller and the compensation current controller in detail, and establishes its mathematical model. The idea of the DC voltage controller and the compensated current controller is analyzed in detail, their mathematical models are established, the selection of relevant controller parameters is completed, and the implementation method of the control strategy is discussed. Finally, a simulation model of the system is established to verify the effectiveness of the above control strategy in the harmonic compensation of the power supply current and the stabilization of the DC voltage, and the good anti-interference ability and robustness of the control strategy are also verified.