Non-ideal modelling and IMC based PID Controller Design of PWM DC-DC Buck Converter

Abstract This paper presents a non-ideal model of DC-DC PWM buck converter considering the parasitic elements (or non-idealities) such as equivalent series resistances (ESRs) of inductors and capacitors, parasitic resistances of semiconductor devices (diode, MOSFET) during conduction and the forward voltage drop of the diode. Incorporating this non-ideal model, a proficient PID control technique is proposed based on the internal model control (IMC) strategy. The salient features of proposed control methodology are: (i) tuning is such that the controller yields the desired bandwidth; (ii) unlike the conventional IMC-PID, the PID parameters are obtained by direct formula without trial and error. The proposed control scheme is simulated in MATLAB/SIMULINK and validated on a hardware setup using DSPACE DS1104 to confirm the superior results under variation of input voltage, reference voltage and load.

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