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 1β¦ to 3kβ¦, and in buck mode, with a range of 1β¦ to 58β¦,
yield consistent results for the FOSEPIC converter with orders of (0.25,
0.35, 0.52, 0.65), effectively regulating around a reference voltage
(ππππ ) 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 ππππ =48V, as demonstrated in Figure 8.
This indicates the controllerβs robustness in maintaining voltage
regulation across different system dynamics.