Research on Direct Torque Control Based on RZVSVPWM of PMSM

2019 14th IEEE Conference on Industrial Electronics and Applications (ICIEA) Pub Date : 2019-06-01 DOI:10.1109/ICIEA.2019.8833809

Wenming Wu, F. Xie, Guoli Li, Kangkang Liang, Chenming Qiu, Hong-ling Jiang

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引用次数: 3

Abstract

The traditional direct torque control (DTC) method for permanent magnet synchronous motor (PMSM) has the problems of unstable switching frequency, large torque ripple and high current harmonic distortion rate. To solve the above problems, this paper proposes direct torque control based on random zero vector space vector pulse width modulation (RZVSVPWM-DTC). Firstly, the mathematical model of PMSM is analyzed. It is found that the control current $i_{q}$ can directly control the torque. It is combined with the mathematical model of DTC, pointing out the shortcomings of the traditional DTC method. Secondly, the RZVSVPWM-DTC is analyzed to illustrate its advantages. Finally, the RZVSVPWM-DTC is used to replace the traditional DTC, and the torque and flux linkage are used as the control objects for simulation analysis. The simulation results show that the RZVSVPWM-DTC has a constant switching frequency, smaller torque ripple and lower line current distortion rate. The system has good dynamic and static performance, which verifies the feasibility and effectiveness of the method.

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基于RZVSVPWM的永磁同步电机直接转矩控制研究

传统的永磁同步电机直接转矩控制方法存在开关频率不稳定、转矩脉动大、电流谐波畸变率高等问题。针对上述问题，本文提出了基于随机零向量空间矢量脉宽调制(RZVSVPWM-DTC)的直接转矩控制方法。首先，分析了永磁同步电机的数学模型。发现控制电流$i_{q}$可以直接控制转矩。结合直接转矩控制的数学模型，指出了传统直接转矩控制方法的不足。其次，对RZVSVPWM-DTC进行了分析，说明了其优点。最后，采用RZVSVPWM-DTC取代传统的DTC，并以转矩和磁链作为控制对象进行仿真分析。仿真结果表明，RZVSVPWM-DTC开关频率恒定，转矩脉动较小，线路电流畸变率较低。系统具有良好的动静态性能，验证了该方法的可行性和有效性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2019 14th IEEE Conference on Industrial Electronics and Applications (ICIEA)

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