Abstract
Three-phase four-leg four-wire (3P4L4W) three -level (3L) inverters have the ability to supply both balanced and unbalanced loads. This letter establishes common-mode (CM) and differential-mode (DM) circuit models for the 3P4L4W 3L inverter. It is revealed that the 3L phase-leg CM voltage is determined by the voltage balancing control (VBC) for the split dc bus voltages, that the DM load voltages are subject to the DM voltage control for the 3L phase leg, and that the CM load voltage is subject to the control for the fourth phase leg. On this basis, a decoupled modulation is proposed where the 3L phase legs are modulated to attain VBC and closed-loop DM load-voltage control, whereas the fourth phase leg is independently modulated to realize the closed-loop CM load-voltage control. The proposed work has been experimentally verified, showing that the 3P4L4W 3L inverter with this decoupled modulation scheme can provide well-balanced ac load voltages and low total harmonic distortion for any type of ac loads: balanced, unbalanced, linear, and nonlinear.
| Original language | English |
|---|---|
| Pages (from-to) | 8594-8598 |
| Number of pages | 5 |
| Journal | IEEE Transactions on Industrial Electronics |
| Volume | 69 |
| Issue number | 8 |
| DOIs | |
| Publication status | Published - Aug 1 2022 |
| Externally published | Yes |
Bibliographical note
Publisher Copyright:© 1982-2012 IEEE.
ASJC Scopus Subject Areas
- Control and Systems Engineering
- Electrical and Electronic Engineering
Keywords
- Closed loop
- common mode (CM)
- differential mode (DM)
- four-leg four wire
- three level
- three phase