基于永磁同步电机的矢量控制和直接转矩控制策略研究

Comparative study on vector control and direct torque control based on permanent magnet synchronous motor

关于传统的直接转矩控制与矢量控制对比的研究相对较为欠缺,从基本原理、逻辑框图和结果分析3个角度对矢量控制和直接转矩控制进行对比。着重对矢量控制的解耦思想和直接转矩控制的定子磁通定向进行分析,通过控制变量法统一电机参数对二者电磁转矩和电流波形进行分析。结果表明:传统直接转矩控制的脉动大于矢量控制,但就超调量而言,传统直接转矩控制更具优势。

Due to the relative lack of comparison between the advantages and disadvantages of traditional direct torque control(DTC)and field oriented control(FOC),the comparison between vector control and direct torque control was carried out from three perspectives:basic principle,logic block diagram and result analysis.Focusing on the analysis of the decoupling idea of FOC and the stator flux orientation of DTC,the electromagnetic torque and current waveforms of the two were analyzed by unifying the motor parameters with the control variable method.The results showed that the pulsation of the traditional DTC was greater than that of the FOC,but in terms of overshoot,the traditional DTC had more advantages.