电动汽车用感应电机直接转矩控制系统的效率最优控制  

Optimal Efficiency Control of Direct Torque Controlled Induction Motor Drives for Electric Vehicles

作　　者：张兴华[1] 孙振兴[1] 王德明[1] 

机构地区：[1]南京工业大学自动化与电气工程学院,南京211816

出　　处：《电工技术学报》2013年第4期255-260,共6页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金(60974009);江苏省"六大人才高峰"计划(09E010)资助项目

摘　　要：针对电动汽车电驱动系统的高效率和快动态响应的性能要求,提出了一种感应电机直接转矩控制系统的效率最优控制方法。在定子磁链定向坐标系中,建立了计及铁心损耗时的感应电机数学模型。通过分析电机损耗与转矩、转速和定子磁链的关系,导出了不同运行工况条件下效率最优的定子磁链幅值计算式,实现了感应电机直接转矩控制变频调速系统的效率最优控制。仿真和实验结果表明,给出的优化控制策略,在保持直接转矩控制快速动态响应特性的同时,可有效提高电机轻载时的运行效率,从而延长电动汽车一次充电的续驶里程。Aim at the demands of the high efficiency and fast dynamic response for electric vehicle drive systems, an efficiency optimization control strategy of direct torque controlled induction motor drives is proposed. Firstly, considering the core losses, the mathematical model of induction motor is established in the stator-field-oriented frame. Secondly, the function relationship between the power losses and the output torque, speed and stator flux is analyzed, and the computational formulation of the stator flux amplitude which makes the power losses minimization is derived at different operation conditions. Consequently, the efficiency optimization control for direct torque controlled induction motor drive systems is achieved. The simulation and experimental results show that the proposed control method not only preserves the fast torque dynamic response, but also improves the operation efficiency of the driving system at light load and lengthens the travel distance of electric vehicles.

关 键 词：电动汽车 感应电机 直接转矩控制 损耗模型 效率优化 

分 类 号：TM351[电气工程—电机]