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。
Theoretical analysis and experimental measurement for current harmonics, the results are agreement.
对电流谐波进行理论分析和实验测量，二者结果吻合。
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