Compared with the two-level inverter,the three-level inverter provides more voltage vectors to the control system.Thus,the current can be controlled accurately,and the current ripple can be reduced effectively.But the three-level inverter has a problem about the neutral point voltage balance.That is,the motor cannot work properly if the neutral point voltage is not controlled.Moreover,the reduction of the switching frequency of the three-level inverter is required in medium-voltage drive field.To address th...
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