Development of a Hybrid Fractional-Order Fuzzy-PID Controller Applied to a DC-DC Buck Converter

This brief focuses on developing a hybrid fractional-order PID (FOPID) controller enhanced with fuzzy logic to regulate the output voltage of a DC-DC Buck converter. The FOPID controller extends traditional PID control by offering improved robustness and more flexible tuning criteria. The controller’s gains are dynamically adjusted using fuzzy logic, enhancing performance across varying operating conditions. The project involved mathematical modeling of the Buck converter and approximating fractional-order operators to integer-order equivalents. Frequency domain analysis was performed using computational tools, including MATLAB, Simulink, and LTspice, to design and simulate the control system. A physical Buck converter was assembled to validate the controller’s experimental performance. The system’s non-linearities were characterized to optimize the hybrid controller, and the best tuning parameters were identified for three distinct operating regions. The experimental results were compared with simulation data, demonstrating the hybrid controller’s enhanced performance in closed-loop operation. The study concludes that the proposed approach outperforms conventional tuning methods, showcasing its potential for advanced industrial control systems.