An analysis on the possibility of using capacitors of a three-level capacitor clamped inverter as power smoothing elements for wind power systems

Jayasinghe, S.D. Gamini, Vilathgamuwa, D. Mahinda, & Madawala, Udaya K. (2011) An analysis on the possibility of using capacitors of a three-level capacitor clamped inverter as power smoothing elements for wind power systems. In Proceedings of the 2011 IEEE Energy Conversion Congress and Exposition (ECCE), IEEE, Phoenix, Arizona, The United States of America, pp. 2963-2970.

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This paper presents a new direct integration scheme for supercapacitors that are used to mitigate short term power fluctuations in wind power systems. The idea is to replace ordinary capacitors of a 3-level flying capacitor inverter by supercapacitors and operate them under variable voltage conditions. This approach eliminates the need of interfacing dc-dc converters for supercapacitor integration and thus considerably improves the overall efficiency. However, the major problem of this unique system is the change of supercapacitor voltages. An analysis on the effects of these voltage variations are presented. A space vector modulation method, built from the scratch, is proposed to generate undistorted current even in the presence of dynamic changes in supercapacitor voltages. A supercapacitor voltage equalisation algorithm is also proposed. Furthermore, resistive behavior of supercapacitors at high frequencies and the need for a low pass filter are highlighted. Simulation results are presented to verify the efficacy of the proposed system in suppressing short term wind power fluctuations.

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5 citations in Scopus
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2 citations in Web of Science®

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ID Code: 75004
Item Type: Conference Paper
Refereed: Yes
Keywords: DC-DC power convertors, Invertors, Loss-pass filters, Supercapacitors, Wind power plants
DOI: 10.1109/ECCE.2011.6064168
ISBN: 9781457705427
Divisions: Current > Schools > School of Electrical Engineering & Computer Science
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2011 IEEE
Deposited On: 14 Aug 2014 01:59
Last Modified: 14 Aug 2014 23:56

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