永磁同步电机直接转矩控制高速运行范围拓宽  

High-speed operation range extension for direct torque controlled permanent magnet synchronous motors

作　　者：林斌[1] 孙丹[1] 贺益康[1] 

机构地区：[1]浙江大学电气工程学院,浙江杭州310027

出　　处：《电机与控制学报》2014年第9期9-16,共8页Electric Machines and Control

基　　金：国家自然科学基金(51377141);国家863计划(2011AA11A101)

摘　　要：为拓宽直接转矩控制(direct torque control,DTC)方式下永磁同步电机(permanent magnet synchronous motors,PMSM)系统的高速运行范围,系统地分析了PMSM系统在最大转矩电流比、恒功率转速比和最大转矩电压比3种运行方式下的特点。根据DTC稳定运行要求,提出了基于转矩角限幅的空间矢量调制(space vector modulation,SVM)-DTC方法,拓宽了PMSM的高速稳定运行范围。其次利用定子磁链定向两相同步旋转坐标系下PMSM的数学模型,提出了基于改进转矩给定的DTC方法。仿真研究表明,改进方法均保留了DTC固有的动态性能优异、计算方便等优点,均可拓宽PMSM的高速运行范围。其中,基于改进转矩给定的DTC方法可使电机在同时满足电流和电压限幅的状态下实现高速稳定运行,性能更优。To extend the high-speed operation range for direct torque controlled（ DTC） permanent magnet synchronous motors（ PMSMs）,the characteristics of PMSM system under the control of three algorithms named as maximum torque per ampere,constant power speed range and maximum torque per voltage,were analyzed respectively. According to the stable operation requirement under DTC,a torque angle limitation strategy was proposed for PMSM DTC system based on space vector modulation（ SVM） to widen the stable high-speed operation of PMSM effectively. Next,a novel control strategy was proposed which modifies the algorithm of reference torque on the basis of analyzing the mathematical model of PMSM stator flux linkage oriented. The simulation results verify that both methods retain the inherent advantages of DTC such as excellent dynamic performance and easy calculation and both of them can broaden the operating range of the motor to achieve high speed. Moreover,the second improved method presents better performance for keeping the amplitudes of current and voltage limiting state.

关 键 词：永磁同步电机 直接转矩控制 高速 转矩角限幅 定子磁链 

分 类 号：TM351[电气工程—电机]