Topology Derivation of Integrated Three‐Port DC–DC Converters for Non‐Isolated Renewable and Hybrid Energy Storage Applications

ABSTRACT In renewable and hybrid energy storage applications, integrated three‐port converters (TPCs) offer advantages of a simpler circuit, higher efficiency, and lower cost than stand‐alone ones. In this paper, a topology derivation approach is proposed to obtain many viable topology candidates of TPCs for practical non‐isolated applications. To begin with, the general principle of the topology derivation is given to ensure the physical realizability of the derived topology. Based on the topology structures of six classical DC–DC converters, the voltage‐type input port (IP), output port (OP), and energy buffer (EB) are extracted, and then two types of fundamental switching component cells, that is, inductor excitation cell (IEC) and inductor discharging cell (IDC) are constructed in terms of power flow directivity. Through multiple path planning in non‐isolated power flow, a flow diagram for the optimal design procedure is presented to guide the synthesis of TPCs. Following this procedure, six possible types of the IEC and IDC in one inductor branch are configured so that six new dual‐input dual‐output (DIDO) converters are derived. Furthermore, a variety of practical power flow paths are reconstructed by means of the appropriate combination of IP and OP, which leads to the fact that these proposed DIDO converters give birth to a family of integrated TPCs. The derived TPCs are further compared in terms of voltage characteristics, device count, electrical stress, and current characteristics to guide topology selection. Particularly, the proposed method can also derive a series of high‐dimensional N ‐port converters. As one example, one derived TPC named buck‐boost‐A‐I3 is analyzed in three operation modes respectively. Finally, these above theoretical analyses are verified by those experimental results.