燃料电池汽车用宽升降压范围准Z源DC-DC变换器  

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

作　　者：王九龙 吴晓刚[1] WANG Jiulong;WU Xiaogang(School of Electrical and Electronic Engineering,Harbin University of Science and Technology,Harbin 150080)

机构地区：[1]哈尔滨理工大学电气与电子工程学院,哈尔滨150080

出　　处：《机械工程学报》2023年第16期325-341,共17页Journal of Mechanical Engineering

基　　金：国家国际科技合作专项资助项目(2019YFE0100200)。

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。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.

关 键 词：燃料电池汽车 DC-DC升降压变换器 准Z源结构 建模 

分 类 号：TK91[动力工程及工程热物理]