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Energies 2017, 10(4), 446; doi:10.3390/en10040446

An Isolated Three-Port Bidirectional DC-DC Converter with Enlarged ZVS Region for HESS Applications in DC Microgrids

1
School of Electrical Engineering and Automation, Tianjin University, Tianjin 300072, China
2
Electric Power Research Institute, State Grid Tianjin Electric Power Company, Tianjin 300384, China
*
Author to whom correspondence should be addressed.
Academic Editor: Gabriele Grandi
Received: 15 February 2017 / Revised: 20 March 2017 / Accepted: 24 March 2017 / Published: 1 April 2017

Abstract

In this paper, a two-stage three-port isolated bidirectional DC-DC converter (BDC) for hybrid energy storage system (HESS) applications in DC microgrids is proposed. It has an enlarged zero-voltage-switching (ZVS) region and reduced power circulation loss. A front-end three-phase interleaved BDC is introduced to the supercapacitor (SC) channel to compensate voltage variations of SC. Consequently, wide ZVS range and reduced circulation power loss for SC and DC bus ports are achieved under large-scale fluctuating SC voltage. Furthermore, a novel modified pulse-width-modulation (PWM) and phase-shift (PHS) hybrid control method with two phase-shift angles is proposed for BA port. And it contributes to an increasing number of switches operating in ZVS mode with varying battery (BA) voltage. Phase shift control with fixed driving frequency is applied to manage power flow. The ZVS range as well as the current stress of resonant tanks under varying port voltages is analyzed in detail. Finally, a 1 kW prototype with peak efficiency of 94.9% is built, and the theoretical analysis and control method are verified by experiments. View Full-Text
Keywords: hybrid energy storage system; there-port isolated converter; series resonant BDC; phase shift control; hybrid control method hybrid energy storage system; there-port isolated converter; series resonant BDC; phase shift control; hybrid control method
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MDPI and ACS Style

Wang, C.-S.; Li, W.; Wang, Y.-F.; Han, F.-Q.; Meng, Z.; Li, G.-D. An Isolated Three-Port Bidirectional DC-DC Converter with Enlarged ZVS Region for HESS Applications in DC Microgrids. Energies 2017, 10, 446.

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