Optimal Design of a Hybrid Controller for DC-DC Buck Converter

Abstract

The world of electrical energy applications heavily relies on power electronic converters. They are found in various fields and are crucial to efficient power management. Due to the nonlinear characteristics of DC-DC converters, the output voltage fluctuates periodically, causing the device to be sensitive to even little changes when the circuit parameters are varied. Consequently, the nonlinear structure and rapid dynamics of these converters add to the complexity of their control process. This paper presents a modified method for controlling the conventional DC-DC buck converter by cascading a Proportional-Integral-Derivative (PID) controller with a One plus Proportional-Integrator (PI) controller. The optimal implementation of the controller parameters is achieved by utilizing the slime mould optimization algorithm (SMA). This mechanism regulates the output voltage in response to changes in the input voltage and output load. With the ISTSE index serving as the objective function, the suggested controller coefficients aim to obtain the lowest possible value for the time- domain performance indexes of the closed-loop system. Then the effectiveness of the proposed PID(1+PI) controller has been shown via comparisons to the widely used PID controller. According to the simulation findings, the SMA-based PID(l+PI) controller outperforms the PID controller in settling and rise time reduction over various operating conditions.