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

Cheng-Shan Wang, Wei Li, Yi-Feng Wang, Fu-Qiang Han, Zhun Meng and Guo-Dong Li
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Cheng-Shan Wang: School of Electrical Engineering and Automation, Tianjin University, Tianjin 300072, China
Wei Li: School of Electrical Engineering and Automation, Tianjin University, Tianjin 300072, China
Yi-Feng Wang: School of Electrical Engineering and Automation, Tianjin University, Tianjin 300072, China
Fu-Qiang Han: School of Electrical Engineering and Automation, Tianjin University, Tianjin 300072, China
Zhun Meng: School of Electrical Engineering and Automation, Tianjin University, Tianjin 300072, China
Guo-Dong Li: Electric Power Research Institute, State Grid Tianjin Electric Power Company, Tianjin 300384, China

Energies, 2017, vol. 10, issue 4, 1-23

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.

Keywords: hybrid energy storage system; there-port isolated converter; series resonant BDC; phase shift control; hybrid control method (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2017
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (8)

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