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Analysis and Improvement of Power Quality for A Fuel Cell System Based on Multi-level Converters  

Kim Yoon-Ho (School of Electrical Engineering, Chung-Ang University)
Moon Hyun-Wook (School of Electrical Engineering, Chung-Ang University)
Kim Soo-Hong (School of Electrical Engineering, Chung-Ang University)
Jeong Eun-Jin (School of Electrical Engineering, Chung-Ang University)
Publication Information
Journal of Energy Engineering / v.14, no.1, 2005 , pp. 37-45 More about this Journal
Abstract
The fuel cell system is one of very useful energy sources. The system has advantages as renew-able and environmental sources. To obtain AC electricity from fuel cells, inverters are necessary. A multilevel converter is used as an inverter for a high power fuel cell system. Through harmonic analysis, it is shown that the harmonic components and THD increase while fundamental component decreases as voltage sag increases. To solve the voltage sag problems, three different approaches are investigated in this paper; installation of a boost converter at the fuel cell output, control of pulse widths, and use of ultracapacitors. The proposed three approaches are analyzed and compared using simulation and experimental results.
Keywords
Fuel cell; Inverter; Harmonics;
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