Research on Buck Converter with Improved Approach Rate Compound Sliding Mode Control Based on PSO

The Buck converter has a large steady state error in the output voltage obtained by the traditional dual integration sliding mode controller when the parameters are changed and the external load is perturbed, for this reason, a composite dual integration sliding mode control strategy is proposed in this paper. Firstly, the estimation of input voltage and load is obtained according to the expanded state observer, secondly, a new convergence rate is designed and the optimal parameters of the convergence rate are found by the particle swarm algorithm, and finally, the control signals are obtained by combining with the binary integrated sliding mode control, which improves the dynamic quality of the output voltage and the immunity to disturbances. The stability analysis and the simulation and experimental verification of the designed controller demonstrate the superiority of the proposed controller with the traditional dual integration sliding mode controller.