燃料电池汽车用宽升降压范围准Z源DC-DC变换器

doi:10.3901/JME.2023.16.325

摘要/Abstract

摘要： 以燃料电池汽车为代表的氢能利用技术，对改善空气质量与减少化石燃料消耗具有积极作用。针对燃料电池汽车用DC-DC变换器的宽升降压范围、低输入电流纹波、宽电压输入范围和输入输出共地要求，将准Z源结构与LC网络进行结合，提出一种基于准Z源结构的非隔离升降压DC-DC变换器。该变换器在非极限占空比下具有宽升降压范围，同时具有连续的输入电流和输入输出共地结构。在建立所提出的升降压变换器小信号模型的基础上，设计该变换器的闭环控制系统。试验结果表明，所提出的变换器能够有效实现3.8倍升压与0.75倍降压，额定功率下最大效率为96.17%。当发生负载扰动与电压阶跃变化时，系统的调节时间均小于250 ms，具有良好的闭环控制效果。所提出的升降压DC-DC变换器适用于燃料电池汽车动力系统。

关键词: 燃料电池汽车, DC-DC升降压变换器, 准Z源结构, 建模

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

中图分类号:

TK91

王九龙, 吴晓刚. 燃料电池汽车用宽升降压范围准Z源DC-DC变换器[J]. 机械工程学报, 2023, 59(16): 325-341.

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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