A Family of Three-Port Half-Bridge Converters for a Stand-Alone Renewable Power System

Abstract

A systematic method to generate three-port half-bridge converters (TPHBCs) interfacing a renewable source, a storage battery, and a load is proposed for a stand-alone renewable power system application. Allowing dc bias current in the transformer, the primary circuit of a half-bridge converter can function as a synchronous rectification buck converter, by which a power flow path can be configured between the renewable source and the battery, which is connected in parallel with one of the dividing capacitor. To make the voltage on any two of the three ports independently regulated, a postregulation and a synchronous regulation with various implementations are proposed. As a result, a family of TPHBCs with merits of simple topologies and control, reduced number of devices, and single-stage power conversion between any two of the three ports is presented. A TPHBC with a synchronous regulation is given as an example to verify the proposed approach and experimental results are also given to validate the TPHBC operation. The topology generation idea is further extended and some novel TPCs are derived for different applications.