Grid-side cascade inverter system as an interface for wind energy storage

Jayasinghe, S.D. Gamini, Vilathgamuwa, D. Mahinda, & Madawala, Udaya K. (2010) Grid-side cascade inverter system as an interface for wind energy storage. In Proceedings of the 2010 IEEE Energy Conversion Congress and Exposition (ECCE), IEEE, Atlanta, GA, The United States of America, pp. 718-723.

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Additional converters that are used to interface energy storage devices incur power losses as well as increased system cost and complexity. The need for additional converters can be eliminated if the grid side inverter can itself be effectively used as the interface for energy storage. This paper therefore proposes a technique whereby the grid side inverter can also be used as an interface to connect a supercapacitor energy storage for wind energy conversion systems. The proposed grid side inverter is formed by cascading a 3-level inverter and a 2-level inverter through a coupling transformer. The three-level inverter is the main inverter and it is powered by the rectified output of the wind turbine coupled AC generator while the 2-level auxiliary inverter is connected to the super capacitor bank that is used to compensate short term power fluctuations. Novel modulation and control techniques are proposed to address the problems associated with non-integer and dynamically-changing dc-link voltage ratio, which is caused by the random nature of wind. 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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ID Code: 75160
Item Type: Conference Paper
Refereed: Yes
Keywords: Dual inverter, Energy storage interfacing, Non-integer voltage ration, Supercapacitor
DOI: 10.1109/ECCE.2010.5617933
ISBN: 9781424452866
Divisions: Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2010 IEEE
Deposited On: 19 Aug 2014 23:44
Last Modified: 22 Jun 2017 08:02

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