Steady-State Analysis of a ZVS Bidirectional Isolated Three-Phase DC-DC Converter Using Dual Phase-Shift Control With Variable Duty Cycle

• Published in: IEEE transactions on power electronics Vol. 31; no. 3; pp. 1863 - 1872
• Main Authors: de Oliveira Filho, Herminio Miguel, de Souza Oliveira, Demercil, Praca, Paulo Peixoto
• Format: Journal Article
• Language: English
• Published: New York IEEE 01-03-2016; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Bidirectional; Bidirectional power flow; Bridge circuits; Bridges; Comparative analysis; Constants; DC to DC; dual phase-shift control; Electric converters; Electric currents; Electric potential; Load flow; Mathematical models; phase-shift; Power supply; Reactive power; soft-switching; Switches; Switching; three-phase dc-dc converter; Topology; Transformers; Voltage; Zero voltage switching; dual phase-shift control; soft-switching; phase-shift (PS); three-phase dc–dc converter; Bidirectional power flow
• ISSN: 0885-8993; 1941-0107
• DOI: 10.1109/TPEL.2015.2428271

This study presents the steady-state analysis and experimental results on a soft-switching bidirectional isolated three-phase dc-dc converter using DPS control with variable duty cycle. The topology uses three single H-bridges in the primary side and a three-phase inverter in the secondary side. High-frequency isolation is ensured by using three single-phase transformers connected in open delta-wye configuration. The variation of both phase-shift angles between the H-bridge legs and/or primary and secondary sides allows controlling the power flow, while reduced reactive power flow is possible. The variable duty cycle is used to ensure a constant voltage bus and/or zero voltage switching operation. A detailed analysis is presented considering a model based on the fundamental components for the voltages and currents in the transformer. A comparison between the fundamental and the actual models is carried out to validate the proposed model. Experimental results on a 96 V/350-400 V, 3.5 kW prototype are presented and discussed to validate the proposed approach.