Abstract
The effects of linear imbalances and nonlinear loads on the voltage balance of the neutral-point-clamped converter are described in this paper. The study reveals that a negative sequence of output currents (linear imbalance) may produce additional low-frequency oscillations to the neutral-point voltage. Similar consequences are produced by odd-order current harmonics from a nonlinear load, while even-order harmonics can cause the neutral-point voltage to shift. Furthermore, the second, fourth and eighth output current harmonics might produce instability to the neutral-point voltage. The second and fourth harmonics are the worst components. The maximum amplitudes of these harmonics superposed to the current fundamentals that the system can tolerate are described. Simulated and experimental examples are presented.
| Original language | English |
|---|---|
| Pages (from-to) | 53-58 |
| Number of pages | 6 |
| Journal | PESC Record - IEEE Annual Power Electronics Specialists Conference |
| Volume | 1 |
| Publication status | Published - 2003 |
| Externally published | Yes |
| Event | 2003 IEEE 34th Annual Power Electronics Specialists Conference - Acapulco, NM, United States Duration: Jun 15 2003 → Jun 19 2003 |
ASJC Scopus Subject Areas
- Modelling and Simulation
- Condensed Matter Physics
- Energy Engineering and Power Technology
- Electrical and Electronic Engineering
Keywords
- Linear imbalances
- Multilevel inverter
- Nearest vectors
- Neutral-point balance
- Neutral-point-clamped inverter
- Nonlinear loads
- Space-vector modulation
- Three-level inverter