说明：  里面包含了三电平逆变和三电平整流。其中三电平逆变是控制PMSM进行调速控制，该三电平是基于T型三电平IGBT，采用逻辑法三电平SVPWM控制，并具有较好的中点电压平衡控制。
(It contains three-level inverter and three-level rectation. Among them, the three-level inverter is to control pmSM for speed control, the three-level is based on T-type three-level IGBT, using logic three-level SVPWM control, and has a good mid-point voltage balance control.)