Research on Improved Three-Phase PWM Rectifier Based on Sliding Mode Control

For the traditional double closed-loop control strategy of three-phase rectifier, the PI parameters are difficult to be adjusted, the adjustment parameters cannot be changed dynamically and the system response speed is slow, etc. A double closed-loop control strategy is proposed, in which the outer voltage loop is controlled by fuzzy pi, and the inner current loop is controlled by the sliding film;. The strategy adopts fuzzy PI control to adjust the PI parameters in real time for the voltage outer loop, and introduces inverse trigonometric function and adjustment coefficient in the switching function for the current inner loop. Finally, simulations are carried out to verify that the control strategy proposed in this paper has good robustness.