A Dual Closed-Loop Control Strategy Research Based on Sliding Mode Control for Vienna Rectifier

Aiming at the shortcomings of traditional control methods, such as slow dynamic response, bad robustness and neutral point potential fluctuation, a double-closed loop sliding mode control strategy for three-phase Vienna rectifier based on fuzzy approach law was proposed. In this paper, the errors between i
d
, i
q
and the reference capacitive voltages were used as the sliding mode surface states of the inner and outer loop to meet the need of multi-objective control requirements of input current, output voltage and neutral point potential. Besides, the fuzzy power reaching law was adopted to improve the transient performance and eliminate chattering when the system is far away from the sliding mode surface. In addition, under the proposed double closed-loop control strategy, the three-phase Vienna rectifier can reach the reference value in a finite time. Finally, the effectiveness of the proposed control strategy and the double-closed loop PI control strategy is verified by simulation.