Fuzzy Control for a Supercapacitor-Based Energy Storage System Using a Dual Active Bridge Converter

Abstract

This work is focused on the design and simulation of a DC-DC converter for an electrical energy storage application, controlling the charge and discharge of a supercapacitor. Dual Active Bridge (DAB) topology is used for its bidirectional characteristic, which operates in Buck-Boost mode allowing a wide range of boost or cut in both directions of the power flow, galvanic isolation and high-power conversion efficiency. A fuzzy logic controller based on reduced rules is implemented for the closed-loop control of the DAB converter, the control logic allows bidirectional power transfer in the supercapacitor. The obtained results are simulated in MATLAB/Simulink software that verifies the converter operation and validates the performance of the proposed controller during the bidirectional power transfer, achieving an accurate regulation of the current in the supercapacitor, even in cases of disturbances present in the DAB converter.