Figure 7. FOSEPIC Converter Under Load Variations for Buck Mode of Operation
During load variations, the two operating modes exhibit distinct behaviors regarding peak-to-peak output voltage. In boost mode, the converter demonstrates lower peak-to-peak values, whereas in buck mode, the peak-to-peak values are higher. Additionally, the response in buck mode shows increased peak-to-peak values for both output voltage and output current. Load variations in boost mode, with load resistance ranging from 1Ω to 3kΩ, and in buck mode, with a range of 1Ω to 58Ω, yield consistent results for the FOSEPIC converter with orders of (0.25, 0.35, 0.52, 0.65), effectively regulating around a reference voltage (π‘‰π‘Ÿπ‘’π‘“ ) of 48V.
Performance Under Variation of Plant Orders
In scenarios involving variations in plant orders, the fractional-order sliding mode controller (FOSMC) with an order of 0.35 successfully regulates the output voltage at π‘‰π‘Ÿπ‘’π‘“ =48V, as demonstrated in Figure 8. This indicates the controller’s robustness in maintaining voltage regulation across different system dynamics.