Robust Discrete-Time Hybrid Controller for Non-Inverting Buck-Boost DC-DC Converter

Abstract

This paper presents a robust hybrid controller for non-inverting buck-boost (NIBB) DC-DC converter. The proposed hybrid controller is comprised of feedback closed-loop PID controller and novel designed feedforward open-loop controller. The proposed open-loop controller supports the PID controller and enhances the system transient response during the system operating parameters transition. The open-loop controller has a simple and static structure. It is also independent of the closed-loop controller and thus has a modular behaviour. In order to show the accuracy, robustness and efficiency of the proposed hybrid control method, both simulation and experimental studies are performed. The comparative results prove that the proposed hybrid controller with the novel developed open-loop controller provides robust and efficient control of the converter. It improves the converter’s output response during the transients of the operating parameters: the change of input voltage, reference output voltage and output load.

A New Double-Switch SEPIC-Buck Topology for Renewable Energy Applications

“…Traditional DC-DC converters such as bucks, boosts, and buck-boosts are the pre-select when switching to step-up/step-down voltage regulation, respectively, mainly due to their simple structures and their low number of electronic/electrical components. However, these converters' duty cycles (switching ratio) must be at their highest levels to provide a little higher voltage gain, which is insufficient to meet the industrial demands of the above-mentioned applications [7].…”

“…Therefore, the wide conversion range DC-DC converter has recently been the subject of much research in power electronics, leading to the visualization of many structures with deep-rooted advantages and disadvantages in terms of switching duty ratios, the number of components, and the associated voltage stress of their semiconductor devices. In addition, most of these studies focus on the high-voltage boost conversion process using different methods such as cascade and parallel stages, coupled inductors (inductors), parallel coupled capacitors, and so on [1][2][3][4][5][6][7][8]. Although there are many research articles on DC/DC converters, there are still many related problems that need to be solved, such as maximum power point tracking, efficiency, voltage gain, current ripple minimization, buck-boost operation regime, quadratic boost, and buck converters [8,9].…”