本文对中压大功率电动机变频调速的技术特点和电路结构进行了分析，阐述了多电平变频器的工作原理。
The technical features of medium voltage high power inverter and the basic structure of its electric circuits are analyzed.
这种中压变频器输出电压为多电平pwm脉冲波形，目前对其谐波还没有完善的理论分析。
Output voltage of this type ASD is multilevel PWM waveform, and by now there is not perfect theoretical analysis for its harmonics.
这种中压变频器输出电压为多电平pwm脉冲波形，目前对其谐波还没有完善的理论分析。
Output voltage of this type ASD is multilevel PWM waveform, and by now there is not perfect theoretical analysis for its harmonics.
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