矩阵变换器－永磁同步电机矢量控制系统的新型电流控制方法

分析了基于电流滞环控制的矩阵变换器—永磁同步电机（MC-PMSM）系统的开关组合状态和存在的缺点：系统侧电流存在较大的5 次和7 次谐波分量。提出了一种改进的电流控制方法，该方法采用电机电流双环控制，得出三相电机电流的6 个电流控制信号，并将输入三相电压分成12 个相区，根据电流控制信号和相区号的不同，选择不同的输入相与输出相连接，确定出矩阵变换器开关组合状态。在此方法下，每个输入相在整个周期内都参与调制，降低了系统输入电流的谐波分量，提高了系统输入电流的正弦度。
Abstract: This paper presented an improved current hysteresis-loop modulation approach for the vector control of matrix converter- permanent magnet synchronous motor (MC-PMSM) system. With the approach, the three-phase input voltages were divided into 12 sections and 3 pairs of current control signals were deduced by comparing the reference values and the measured values of the output currents based on double current loops. Then, the states of the switches in the MC-PMSM system were determined according to the section number of the input voltages and one of the 3 pairs of current control signals, so that the modulation of every input voltage phase held in the whole periods. Hence the 5th harmonic, the 7th harmonic, and the total harmonic distortion (THD) of the input currents, which were relative large when the based current hysteresis-loop modulation method was adopted in the system, are obviously reduced and the input currents of the system become more sinusoidal.
关键词﹕矩阵变换器；永磁同步电机；谐波分量；电流双环控制；矢量控制
Keywords: Matrix converter, permanent magnet synchronous motor, harmonic components, double current loop modulation, vector control