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Capacitor Voltage Balancing in a Three-Level-Converter-Based Energy Storage System
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| Author(s) |
S. Burusteta; J. Pou; S. Ceballos; I. Marino; J.A. Alzola; V.G. Agelidis |
| Abstract |
This paper discusses a grid-connected energy storage system based on two three-level (3L) converters: a DC-DC one and a neutral-point-clamped inverter. When compared to a system using standard two-level converters, the main advantages of this system are: higher efficiency, smaller reactive components allowing for a system cost reduction and its capability to handle higher voltage and power. A modulation strategy for the DC-DC converter which includes the neutral-point voltage balance control is proposed. The capability of the DC-DC converter to cancel the inverter’s neutral-point voltage oscillations is also analyzed. Results are presented to illustrate the extended operation area without imbalances. Design
guidelines to size the DC-link capacitors are given for a practical implementation. Experimental results taken from a
10 kW 3L DC-DC converter prototype are provided to show the capability of this particular converter to keep neutralpoint
voltage balance. |
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| Filename: | Unnamed file |
| Filesize: | 1.267 MB |
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| Type |
Members Only |
| Date |
Last modified 2014-05-15 by System |
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