International Journal of Modern Research in Electrical and Electronic Engineering

In various areas of electrical and electronic equipment applications, power electronic converters are widely used. However, the fast and nonlinear dynamics are associated with these converters. Thus, designing a controller with high response speed and robust capability is critical to guarantee efficient operation of a power electronic converter. A computer-based model was developed in the MATLAB/Simulink environment. The high overshoot experienced can be attributed to the inability of the buck converter to handle nonlinearity in the system's dynamic process. To address this challenge and improve system performance, a Proportional-Integral-Derivative (PID) controller was designed and integrated into the converter’s control loop. Simulation results indicated that the application of the PID controller led to faster response and shorter convergence time, measured by rise time (3.01e-05 s) and settling time (0.000223 s), along with better stability and a smoother response, evidenced by the reduction of overshoot from 42.3% to 10.9%. Therefore, a cascade control system based on combined Fuzzy-PID and PID controllers was designed and applied to the buck converter. The simulation results showed that the cascade control scheme achieved an improved rise time of 1.88 × 10^(-5) s, a settling time of 3.02 × 10^(-5) s, and an overshoot of 1.36%.