Quasi-Z Source DC-DC Converter with Wide Step-up/step-down Range for Fuel Cell Vehicles

doi:10.3901/JME.2023.16.325

Abstract

Abstract: Hydrogen energy utilization technology represented by fuel cell vehicles has a major impact on improving air quality and reducing other fossil-fuel-related problems. Aiming at the requirements of wide step-up and step-down range, low input current ripple,wide voltage input range and common ground between input and output of DC-DC converters for fuel cell vehicles, a non-isolated buck-boost DC-DC converter based on quasi-Z source structure is proposed by combining quasi-Z source structure with LC network.The converter not only has a wide step-up and step-down range under non-limit duty cycle, but has a continuous input current and input-output common ground structure. Based on the small signal model of the proposed buck-boost converter, the closed-loop control system of the converter is designed. The experimental results show that the proposed converter can effectively achieve 3.8 times step-up and 0.75 times step-down, and the maximum efficiency is 96.17% at rated power. When load disturbance and voltage step occur, the adjust time of the control system is less than 250 ms, which has a good closed-loop control effect. The proposed buck-boost DC-DC converter is suitable for fuel cell vehicles powertrain.

Key words: fuel cell vehicle, DC-DC buck-boost converter, Quasi-Z source structure, modeling

CLC Number:

TK91

WANG Jiulong, WU Xiaogang. Quasi-Z Source DC-DC Converter with Wide Step-up/step-down Range for Fuel Cell Vehicles[J]. Journal of Mechanical Engineering, 2023, 59(16): 325-341.

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