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Take a cascaded multilevel inverter with four H-bridges in each phase leg for example, this paper studies the basic theories of two different carrier phase-shifted SPWM (CPS-SPWM) methods: unipolar dual-frequency CPS-SPWM and bipolar CPS-SPWM, and compares the advantages and disadvantages of these two algorithms. It also does some researches on the factors which may influence the output waveform quality...
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