Abstract
This article presents an optimal carrier-based voltage balancing scheme for three-phase three-level converters. The proposed scheme utilizes two available degrees of freedom, i.e., zero-sequence signal injection and virtual zero-level modulation (VZM), to eliminate the low-frequency neutral-point voltage oscillation. It is universally effective over the full power factor and modulation index range and easy to implement in digital controllers. The hybrid algorithm combines the merits of both approaches, which offers the optimal performance regarding controllability, switching device power losses, and output harmonics. The main drawbacks of VZM, i.e., the increased switching loss and high-frequency harmonics due to additional switching transitions, have been minimized in the proposed scheme. The performance of the proposed scheme is evaluated through simulation and experiment.
| Original language | English |
|---|---|
| Article number | 9052463 |
| Pages (from-to) | 3865-3878 |
| Number of pages | 14 |
| Journal | IEEE Transactions on Industry Applications |
| Volume | 56 |
| Issue number | 4 |
| DOIs | |
| State | Published - 1 Jul 2020 |
| Externally published | Yes |
Keywords
- DC-AC power converters
- pulsewidth modula-tion
- three-level converters
- voltage balancing
All Science Journal Classification (ASJC) codes
- Control and Systems Engineering
- Industrial and Manufacturing Engineering
- Electrical and Electronic Engineering