参考电压矢量的计算是基于空间矢量调制(space vector modulation, SVM)的永磁同步电机直接转矩控制的核心研究之一. 从电压矢量对电磁转矩的控制作用入手, 分析指出有限的电压矢量是直接转矩控制中转矩和磁链脉动大的根本原因. 设计一种改进的基于空间矢量调制的直接转矩控制系统, 仅仅利用定子磁链角度、转矩偏差和定子磁链偏差计算得到参考电压矢量幅值和角度. 该方案计算简单, 对电机参数不敏感. 仿真和实验结果表明, 该方法结构简单、鲁棒性强, 能够明显改善直接转矩控制性能.
To obtain the reference voltage vector is a key to the direct torque control (DTC) of permanent magnet synchronous motor (PMSM) based on the space vector modulation (SVM). From the control effect of the voltage vector on electromagnetic torque, the analysis shows that the limited number of voltage vectors is a primary cause of large ripple in the torque and flux of a DTC system. A robust DTC method of PMSM based on SVM is proposed. Amplitude and phase angle of the reference voltage vector is calculated according to the flux phase position, errors in the torque and flux, which is insensitive to motor parameters. Simulation and experimental results show that the improved DTC method based on SVM with a simple structure has strong robustness and can greatly improve the DTC performance.
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