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Neutral-Point Voltage Balancing Method for Five-Level NPC Inverters Based on Carrier-Overlapped PWM
- Source :
- IEEE Transactions on Power Electronics. 36:1428-1440
- Publication Year :
- 2021
- Publisher :
- Institute of Electrical and Electronics Engineers (IEEE), 2021.
-
Abstract
- Neutral-point voltage imbalance is one of the main problems of five-level neutral-point clamped inverters that impedes their industrial application. In order to solve this problem, a closed-loop neutral-point voltage balancing method based on carrier-overlapped pulsewidth modulation (COPWM) is proposed in this article. The four dc-link capacitor voltages are balanced by three steps: voltage balancing between the two outer capacitors, voltage balancing between the two inner capacitors, and voltage balancing between the two inner and the two outer capacitors. The relationship between the neutral-point currents and the reference voltage is studied, and the top and the bottom dc-link capacitor voltages are balanced by zero-sequence voltage injection. The two inner capacitor voltages are balanced by adjusting the width of switching signals. Simulation and experimental results are presented to confirm the validity of this method.
- Subjects :
- Physics
020208 electrical & electronic engineering
Hardware_PERFORMANCEANDRELIABILITY
02 engineering and technology
AC power
Topology
law.invention
Capacitor
Hardware_GENERAL
Capacitor voltage
Modulation
Neutral point voltage
law
Hardware_INTEGRATEDCIRCUITS
0202 electrical engineering, electronic engineering, information engineering
Electrical and Electronic Engineering
Pulse-width modulation
Voltage reference
Voltage
Subjects
Details
- ISSN :
- 19410107 and 08858993
- Volume :
- 36
- Database :
- OpenAIRE
- Journal :
- IEEE Transactions on Power Electronics
- Accession number :
- edsair.doi...........b21c31ff1990216f1afee59612e1bb6f