矩阵变换器驱动永磁同步电机直接转矩控制

Direct Torque Control of Permanent Magnet Synchronous Motor Driven by Matrix Converter

与传统的交直交变频器相比,矩阵变换器能实现能量的双向流动,四象限运行。并且,矩阵变换器具有更多的电压矢量,能为直接转矩控制提供更多的灵活性,获得更好的控制性能。在分析了输入电压变化特点的基础上,将矩阵变换器输入电压分成24个扇区,产生两种不同的电压矢量幅值变化分布情况。将直接转矩控制电机定子磁链运动轨迹改进为三十边形,根据当前输入电压所在的分区及磁链轨迹所处的扇区,选择不同幅值的电压矢量,以较低的矩阵变换器开关频率获得较小的电机转矩脉动。

Compared with the traditional AC-DC-AC converter, the matrix converter can achieve double-way flow of energy and four-quadrant operation. Moreover, the matrix converter has more voltage vectors, which can provide more flexibility for direct torque control and obtain better control performance. Based on the analysis of the characteristics of the input voltage variation, the input voltage of the matrix converter is divided into twenty-four sectors to generate two different voltage vector amplitude variation distributions. The trajectory of stator flux of direct torque control(DTC) motor is modified into a 30-side shape, and the voltage vectors of different amplitudes are selected according to division of the input voltage, Smaller torque ripple of Motor with lower switching frequency of Matrix Converter.