Robust Adaptive Feedback VBW Model for HM-Based SM Controller for DC-DC Multicellular Converters

Abstract

This manuscript describes a comparative analysis between the variable-bandwidth (VBW) of the hysteresis modulation (HM) and the unipolar pulse-width modulation (PWM) by double intersection, both based on the conventional sliding mode (CSM) strategy. The two adopted techniques are applied to a new topology of a bidirectional asynchronous multichannel DC-DC Buck converter. The cells are parallelconnected and operating in continuous conduction mode (CCM).Our study contributes to the control method and the implementation, the command is applied at the same time without phase shift to an identical three cells of a non-isolated and asynchronous converter, this topology is rarely studied. The aim is to fix the switching frequency of the converter while referring to an adaptive feedback approach. Therefore, we integrate a hysteresis modulator and develop a variable hysteresis band function to attenuate the non-linearity phenomenon of the conventional sliding mode. Then, we apply an adaptive feedback current control technique to surpass the dilemma of the variable switching frequency for high power converters. The results demonstrate that the studied system became more stable, more efficient, and able to cope with variations in input voltage, load, and desired output voltage. The same results clearly show the areas where significant differences have been found between the two strategies. Simulation studies in the MATLAB® / Simulink™ environment are performed to analyze system performance and assess its robustness and stability under parametric variation.