DC microgrids and battery charging

Abstract

This paper presents an SAB converter for connecting a DC network to an electric vehicle battery for the purpose of rapid charging. The chosen topology provides galvanic isolation and uses a resonant circuit operating above the resonant frequency. This paper proposes a simple control law to control the battery charging current by acting on the frequency of the resonant circuit using a VCO. The non-linear behavior of the converter is identified by a least squares procedure and the control law is composed of a linear controller and a non-linearity compensation block Various simulation tests validate the proposal for a wide range of load currents.