Design of double-integral sliding-mode controller for fourth-order double input DC - DC boost converter with a voltage multiplier cell

Abstract

ABSTRACT A voltage multiplier cell (VMC)-integrated dual-input boost converter (DIBC) with an inductor at the two inputs for dual boost, and working at a duty cycle greater than 0.5 is a requirement for achieving a high voltage gain from low-voltage energy sources. The main focus of this work is to design a suitable control to effectuate the voltage regulation during input voltage and load disturbances, as well as to reduce the start-up transient. The pulse-width-modulation-based double-integral sliding-mode controller was investigated for desirable voltage regulation. Two input inductor current references are incorporated in the controller design to facilitate the decoupling between the interacting loops, which render the design complex with two sliding surfaces for each input inductor current. Also, a comparative analysis with dual-loop proportional-integral control for DIBC with single VMC is presented to highlight the robustness of the proposed controller. A converter model of 200 W is developed, and the controller is carried out using a field-programmable gate array. Under various disturbance scenarios, MATLAB simulation and experimental results clearly showed the satisfactory transient and steady-state output voltage regulation with the proposed controller.