The carrier shifted-phase PWM technique can been used in cascade multilevel inverter, in addition, the stepwaveform strategy is good strategy, too.
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。
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Different signals such as sine waveform, stepwaveform and exponential waveform are available. Its frequency and phase can be adjusted precisely through the front panel.
The paper introduces a multi-level H-bridge converter, which produces 18-stepwaveform according to required control method. The standard sine waveform can be gotten after passing through the filter.