基于定子磁链自适应预测的PMSM直接转矩控制研究

Direct Torque Control of Permanent Magnet Synchronous Motor Based on Adaptive Predictive Stator Flux

针对永磁同步电动机(PMSM)直接转矩控制(DTC)中磁链和转矩脉动问题,提出了一种新的基于定子磁链自适应预测的直接转矩控制方法。采用转子位置和定子电流预测下一控制周期定子的磁链,通过预测和估算定子磁链的偏差计算出下一个控制周期所施加的参考电压空间矢量;采用对称七段式SVM技术调制该电压,实现每个周期对磁链和转矩误差的补偿,从根本上抑制磁链和转矩的脉动。理论分析和仿真结果表明,该方法与传统直接转矩控制相比,能显著抑制磁链和转矩脉动,且具有良好的动静态性能。研究具有一定实际应用价值。

Studyed the flux and the torque ripple further in direct torque control of permanent magnet synchronous motor, a new kind of direct torque control method based on adaptive predictive stator flux was presented. This method predicted the stator flux next cycle according to the rotor position and the stator current, and calculated next control cycle＇s synthesized reference voltage vector by the error, then modulated with the symmetrical seven sections of types SVM technology, thus exactly realized to compen- sate the error of flux and torque in every cycle. Theoretical analysis and simulation results showed the method could suppress the flux and the torque ripple remarkably and had a better static-dynamic performance than traditional DTC.