Adaptive Second-Order Sliding Mode Control of Buck Converters with Multi-Disturbances

Adaptive Second-Order Sliding Mode Control of Buck Converters with Multi-Disturbances

Blog Article

In this paper, a novel adaptive second-order sliding mode (2-SM) control approach, based on online zero-crossing detection, was proposed to solve the problems of the chattering and fixed control gain for buck converters with multi-disturbances.In modeling, the possible parameter perturbations and external disturbances of the converter system were contained.Instead of the traditional first-order sliding mode (1-SM), the twisting algorithm with 2-SM was adopted for the controller design, which could overcome the chattering problem and realize control continuity.Meanwhile, a novel adaptive mechanism was Engine Cold Air Intake introduced to replace the conventional fixed control gain by time-varying control gain, the idea of which is to calculate the number of the zero-crossing points of the sliding surface online.

As a result, the control magnitude of the improved controller EMU OIL could be reduced to a minimal admissible level, and the steady error of the output voltage could converge to the expected value.Furthermore, the robust stability of the converter system with multi-disturbances wads investigated.Comparative simulations and experiments validated the advantages of this paper as offering better robustness and control performance.