基于转矩预测的三电平逆变器直接转矩控制研究

针对合成矢量三电平逆变器直接转矩控制造成转矩脉动过大的缺点，提出了一种预前控制的方法。该方法根据磁链和转矩误差，来确定逆变器的参考电压矢量，然后利用空间矢量脉宽调制合成此开关电压矢量。仿真结果表明，在保证开关频率一定的情况下，该方法较好地减少了转矩脉动，且磁链轨迹近似为圆，电流波形正弦性良好。

Study on Three-Level Inverter Direct Torque Control Based on Torque Prediction

Aiming at excessive torque ripple shortcomings caused by direct torque control of synthesizing voltage vectors in the threelevel inverter, a kind of new predictive control method was proposed to determine reference voltage vectors of the inverter according to errors of the flux and torque. Then this switching voltage vectors were synthesized with space vector pulse width modulation （SVPWM）. The simulation results show that under the conditions of protection of switching frequency, the control method can lessen the torque ripple and maintain waveforms of the stator flux nearly round and sine character of the current is nice.