改进的三相感应电机直接转矩控制建模与仿真  

Modeling and simulation of improved induction motor direct torque control

作　　者：谢莉 蒋伟 周斌欣 吴松 

机构地区：[1]扬州大学水利与能源动力工程学院,江苏扬州225127 [2]扬州大得机电科技有限公司,江苏扬州225000

出　　处：《机电工程》2015年第8期1132-1135,共4页Journal of Mechanical & Electrical Engineering

基　　金：国家自然科学基金资助项目(51207135);江苏省自然科学基金资助项目(BK2012266);扬州大学研究生培养创新工程基金资助项目(CXLX_1416)

摘　　要：针对传统直接转矩控制中,磁链溢出和转矩脉动大等问题,对三相感应电机直接转矩控制进行了研究,提出了基于电压空间矢量PWM的新型控制方法。首先,根据转速的变化量产生电磁转矩的目标,然后根据定子磁链的变化量计算出电压矢量的大小,利用转矩的变化量确定电压矢量的方向,再经过电压矢量PWM逆变得到电机的三相输入电压,完成整体控制。该方法克服了传统方法的缺点,对磁链的控制完全定量,较好地实现了磁链轨迹圆形控制,最后利用Matlab/Simulink软件搭建了系统仿真模型,验证了该方法的有效性。研究结果表明,磁链幅值保持恒定,转矩脉动小,系统响应速度快,暂态时间短,能够有效地模拟真实系统,充分证明了其优越性和有效性。Aiming at the problem of flux overflow and torque ripple spill in the traditional direct torque control, the three-phase induction motor direct torque control was studied. New control method based on voltage space vector PWM was proposed. First of all, the target electromagnetic torque was generated by the amount of change of speed. Then, the magnitude of the voltage vector was calculated according to the amount of change of stator flux. The direction of the voltage vector was determined using the amount of change of torque. The three-phase in- put voltage was gained through the voltage vector PWM inverter to complete the overall control. The method overcame the shortcomings in tra- ditional methods. The stator flux was controlled quantitatively, and the better circular flux trajectory control was achieved. At last, a system model was built based on Matlab/Simulink software. The results indicate that the system has stable flux magnitude, low torque ripple, fast response speed, short transient time, and can simulate the real system ideally and effectively.

关 键 词：三相感应电机 直接转矩控制 磁链 转矩 

分 类 号：TH39[机械工程—机械制造及自动化] TM343[电气工程—电机]