【摘要】 文章从三电平ＰＷＭ变频器的输出状态、电压波形、空间电压矢量、谐波等几个方面分析了它的基本结构、控制原理，揭示了六角形空间电压矢量图的内在机理。详细叙述了三电平ＰＷＭ变频器在输出调频、调压和ＰＷＭ调制控制中的作用以及三电平ＰＷＭ变频器的优异性能。更多还原

【Abstract】 The basic structure and control principle of the three potential PWM frequency transformer(TPFT)are analized in the article from the aspects of its output state,voltage waveform,space voltage vector and harmonic etc.The internal mechanism of the hexagon space voltage vector graph is revealed.The excellent properties of the TPFT and its function in the output frequency regulation,voltage regulation and PWM modulation control are stated in detail.更多还原