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直接转矩控制具有良好的调速性能，但尚未能应用于级联型多电平变频器。
Direct torque control (DTC) has the high performance of speed control, but it hasn't been utilized to cascaded multilevel inverters at present.
级联型多电平变频器控制策略除了采用载波相移PWM技术外，阶梯波算法也是一种比较好的控制策略。
The carrier shifted-phase PWM technique can been used in cascade multilevel inverter, in addition, the step waveform strategy is good strategy, too.
目前，多电平变频器的主要结构形式可分为二极管嵌位型，电容嵌位型和单元级联型三种。
At present, cascaded multicell converter, diode clamped multilevel converter and flying capacitor multilevel converter are 3 mainly converting topologies.
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