Simulation research on sliding mode PID control of Buck converters with improved approaching law

Abstract

To solve the problem that Buck converters under traditional control strategies will be affected by various disturbances, resulting in poor stability, a new sliding mode PID control strategy based on improved power exponential reaching law is proposed. The sliding mode PID control model of Buck converter is constructed by using the state space average method. On this basis, the traditional reaching law is improved, and the system equivalent control expression of the improved reaching law is obtained by calculation. Finally, according to the equivalent control expression, the control models are built in Matlab/Simulink simulation software, and compared with the PWM-based sliding mode PID control strategy. The simulation results show that the controller with improved reaching law can effectively reduce chattering, steady-state error and overshoot of the system. Besides, the improved controller can make the robustness of the system better.