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Capacitor Voltage Balance Limits in a Multilevel-Converter-Based Energy Storage System
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| Author(s) |
Sendoa BURUSTETA, Josep POU, Salvador CEBALLOS, Iker MARINO, José Ángel ALZOLA |
| Abstract |
This paper studies an energy storage system based on a three-level DC-DC converter and a grid-connected neutral-point-clamped inverter. The main advantages of this multilevel power conversion system are highlighted and the neutral-point voltage oscillations are analyzed. A modulation algorithm for the DC-DC converter which includes the neutral-point voltage balance control is used to improve the voltage balancing capabilities of the inverter. Some figures are presented to show the extended operating areas without neutral-point voltage oscillations thanks to the contribution of the DC-DC converter to the voltage balance. Finally, some guidelines to size the DC-link capacitors are given for a practical application. |
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| Filename: | 0584-epe2011-full-17302516.pdf |
| Filesize: | 464.4 KB |
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| Type |
Members Only |
| Date |
Last modified 2012-01-26 by System |
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