基于准Z源逆变器的电动汽车调速策略

Implementation of Quasi-Z Source Inverter for the Speed Governing Strategy for Electric Vehicle

电驱系统作为电动汽车的核心构成,研究其工作机理和调速策略具有深远的实际意义。电动汽车搭载蓄电池作为其动力来源,在启动,加减速等复杂工况时,蓄电池的电压会产生很大的跌落,对整个驱动性能和电池损耗都会产生巨大影响。利用准Z源逆变器具有直通状态的特性实现直流母线的升降压,根据电动汽车实际状况进行调压,从而达到改善电动汽车驱动性能的目的。本文针对准Z源逆变器需要插入直通时间对传统的SVPWM调制加以改进。结合异步电机基于磁链的闭环矢量控制系统,通过仿真实验验证准Z源逆变器具有提高电机的驱动性能的特性。

Motor driving system which is regarded as the core of electric vehicle,so learning its operation mechanism and speed governing strategy is of profound practical significance.The battery is the power source of electric vehicle and will suffer huge voltage sag when the vehicle is in a complex condition like starting,accelerating and decelerating which will lead to a dilemma for drive performance and battery’s life of electric vehicle.According to the quasi-Z source inverter’s characteristic that it can improve or weaken the voltage of DC bus bar,could improve the drive performance of electric vehicle by regulating the voltage according to the practice state.This paper adjusted the SVPWM controller to meet the requirement that quasi-Z source inverter needs shoot-through time and with asynchronous motor closed-loop vector control,verified that the quasi-Z source inverter can improve the drive performance of motor by simulation.