改善电动汽车动力性能的双向Z源逆变器控制策略  

Control Scheme of Bi-Directional Z-Source Inverter in Improving the Dynamic Performance of Electrical Vehicles

作　　者：刘和平[1] 刘平[1] 胡银全[1] 付强[2] 

机构地区：[1]重庆大学输配电装备及系统安全与新技术国家重点实验室,重庆400044 [2]威斯康星大学电气工程与计算机科学学院,密尔沃基wi53211

出　　处：《电工技术学报》2012年第2期139-145,共7页Transactions of China Electrotechnical Society

基　　金：国家863计划(2003AA501350);中央高校基本科研业务费(CDJXS11150002)资助项目

摘　　要：探讨了一种改善电动汽车动力性能的双向Z源逆变器控制系统,提出了母线电压提升的控制策略。文章定性分析了电动汽车在加速等工况下蓄电池组的电压跌落对驱动性能的影响。采用双向Z源逆变器拓扑,根据异步电机运行特性和车辆的动力性需求升高直流母线电压,针对电压降落较大导致的电机驱动力矩减少和电动汽车高速运行时电机输出功率不够的问题进行解决,改善其动力性能。对纯电动汽车Z源逆变器系统的性能进行了仿真和实验。结果证实了控制策略的可行性和有效性。In this paper,a control system based on bi-directional Z-source inverter is discussed for improving dynamic performance of electrical vehicles,and the control scheme for boosting the DC-link voltage is presented.The influence of battery packs＇ voltage drop on driving performance is analyzed qualitatively under different conditions,such as electric vehicles acceleration.According to the principles of induction motor and vehicles dynamic demand,a topology of bi-directional Z-source inverter is adopted to improve the status of the motor torque reduction due to the large drop of voltage,and improve the output of motor power while electrical vehicles driven at high-speed.The results from the simulations and the experiments of a bi-directional Z-source inverter control system for electrical vehicles verify the feasibility and demonstrated the performance of the proposed control scheme.

关 键 词：电动汽车 双向Z源逆变器 动力性能 异步电机 直流母线电压 

分 类 号：TM343[电气工程—电机]