Comparative Study of the Open-Loop Buck Converter and the Closed-Loop PID Controlled and Fuzzy Logic Buck Converter

This research paper presents a comparative analysis of open-loop control, closed-loop PID control, and closed-loop fuzzy logic control buck converter. The main objective is to reduce harmonic distortion in buck converter. The experimental results show that the open-loop buck converter output voltage THD is 328.48%. On the other hand, the closed-loop PID controller output voltage THD is 227.73%, and the fuzzy logic-controlled buck converter output voltage THD is 202.26% for 400V. The simulation results clearly demonstrate that the fuzzy logic controller outperforms the other two control methods. It exhibits the fastest response to changes in input voltage and load current while maintaining the output voltage consistently within a predetermined range. The PID controller also shows commendable performance, but the fuzzy logic controller excels in compensating for disturbances. Conversely, the open-loop converter displays the least favorable performance, characterized by slowness. Based on these findings, it is evident that the closed-loop fuzzy logic control offers the most advantageous solution for efficient and precise voltage regulation, making it a preferred choice for buck converter applications in practical scenarios.