Abstract
This paper discusses the generalized theory of phase-shifted carrier pulsewidth modulation (PSC-PWM) for cascaded H-bridge (CHB) converters and modular multilevel converters (MMCs), provides a reasonable classification of the PSC-PWM, and extends the possible phase-shift angles to full range. First, the PSC-PWM for CHB converter is classified into two categories by phase-shift pattern. In addition, by rigorous mathematical derivation, the impact law of the full-range phase-shift angles on harmonic minimization is obtained. And then, it is proved that the generalized theory is equally applicable to MMC, which also merges the former proposed PSC-PWM for MMCs into itself. Moreover, the harmonic analysis of the dead-time error voltage is discussed, which is found to have the same harmonic distribution as the ideal voltage, except for the emerging of odd-order harmonics. In summary, this generalized theory offers a general perspective of the PSC-PWM for CHB converter and MMC, and builds up a scientific and comprehensive understanding for researchers from both academia and industry. Finally, the analytical findings are sufficiently validated by simulation and experimental results.
| Original language | English |
|---|---|
| Article number | 7239532 |
| Pages (from-to) | 589-605 |
| Number of pages | 17 |
| Journal | IEEE Journal of Emerging and Selected Topics in Power Electronics |
| Volume | 4 |
| Issue number | 2 |
| DOIs | |
| State | Published - Jun 2016 |
Keywords
- Cascaded H-bridge (CHB) converter
- generalized theory
- modular multilevel converter
- phase-shift angle
- phase-shift pattern
- phase-shifted carrier pulsewidth modulation (PSC-PWM)