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标题：新型三相感应电机直接转矩控制系统建模与仿真 |
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作者：吴松，刘士全，陈嘉鹏，等 |
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| 2018年第1期 访问次数：298次 |
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摘要：本文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，充分证明了本文提出的直接转矩控制系统的可行性、优越性和有效性。
关键词：三相感应电机；直接转矩控制；定子磁链；电磁转矩
Abstract: Aiming at the problem of flux overflow and torque ripple spill in the traditional direct torque control，the threephase induction motor direct torque control was studied in the paper．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 threephase input voltage was gained through the voltage vector PWM inverter to complete the overall control. The method overcame the shortcomings in traditional 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 demonstrate the feasibility，advantages and effectiveness of direct torque control system.
Key words: threephase induction motor; direct torque control; stator flux; electromagnetic torque |
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