Sliding Mode Variable Structure Control on Vienna Rectifier

Based on the mathematical model of Vienna rectifier, the controller of Vienna rectifier is researched and designed . The voltage outer loop adopt the sliding mode variable structure control (SMC), in order to obtain a stable DC output voltage when Vienna rectifier is starting or is affected by the load disturbance and so on. The deviation of the output voltage is selected as the sliding mode switching function. For the chattering problems of the traditional index approach rate, the variable index approach law is proposed in this paper. The current inner loop uses model predictive control on finite set (FCS-MPC) of no modulation unit, easy to add constraints, strong anti-interference ability. Finally, the proposed control strategy is simulated. The simulation results show that the method is correct and effective ,the Vienna rectifier has strong robustness and anti-interference ability.