An Enhanced Hybrid Switching-Frequency Modulation Strategy for Fuel Cell Vehicle Three-Level DC-DC Converters with Quasi-Z Source

Yun Zhang, Jilong Shi, Chuanzhi Fu, Wei Zhang, Ping Wang, Jing Li and Mark Sumner
Additional contact information
Yun Zhang: School of Electrical and Information Engineering, Tianjin University, 92 Weijin Rd, Nankai District, Tianjin 300072, China
Jilong Shi: Changchun Power Supply Company, 4799 Renmin Street, Changchun 130022, China
Chuanzhi Fu: School of Electrical and Information Engineering, Tianjin University, 92 Weijin Rd, Nankai District, Tianjin 300072, China
Wei Zhang: School of Electrical and Information Engineering, Tianjin University, 92 Weijin Rd, Nankai District, Tianjin 300072, China
Ping Wang: School of Electrical and Information Engineering, Tianjin University, 92 Weijin Rd, Nankai District, Tianjin 300072, China
Jing Li: Department of Electrical and Electronic Engineering, University of Nottingham Ningbo China, Ningbo 315100, China
Mark Sumner: Department of Electrical and Electronic Engineering, University of Nottingham, Nottingham NG7 2RD, UK

Energies, 2018, vol. 11, issue 5, 1-16

Abstract: For fuel cell vehicles, the fuel cell stack has a soft output characteristic whereby the output voltage drops quickly with the increasing output current. In order to interface the dynamic low voltage of the fuel cell stack with the required constant high voltage (400 V) of the inverter DC link bus for fuel cell vehicles, an enhanced hybrid switching-frequency modulation strategy that can improve the voltage-gain range is proposed in this paper for the boost three-level DC-DC converter with a quasi-Z source (BTL-qZ) employed in fuel-cell vehicles. The proposed modulation strategy retains the same advantages of the original modulation strategy with more suitable duty cycles [1/3, 2/3) which avoids extreme duty cycles. Finally, the experimental results validate the feasibility of the proposed modulation strategy and the correctness of its operating principles. Therefore, the BTL-qZ converter is beneficial to interface the fuel cell stack and the DC bus for fuel cell vehicles by using the proposed modulation strategy.

Keywords: phase-shifted modulation strategy; wide voltage-gain range; low voltage stress; switching states; flying capacitor (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: 2018
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (3)

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