Connecting two wind turbine generators to the grid using only one three level NPC inverter

Jayasinghe, S.D. Gamini, Vilathgamuwa, D. Mahinda, & Madawala, Udaya K. (2010) Connecting two wind turbine generators to the grid using only one three level NPC inverter. In Proceedings of the 36th Annual Conference on IEEE Industrial Electronics Society (IECON 2010), IEEE, Glendale, AZ, 3263 -3268.

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This paper explores the possibility of connecting two Wind Turbine Generators (WTG) to the grid using a single three level inverter. In the proposed system the rectified output of one WTG is connected across the upper dc-link capacitor of a standard diode clamped three level inverter. Similarly the rectified output of the other WTG is connected across the lower capacitor. This particular combination has several advantages such as, direct connection to the grid, reduced parts count, improved reliability and high power capacity. However, the major problem in the proposed system is the imminent imbalance of dc-link voltages. Under such conditions conventional modulation methods fail to produce desired voltage and current waveforms. A detailed analysis on this issue and a novel space vector modulation method, as the solution, are proposed in this paper. To track the Maximum power point of each WTG a power sharing algorithm is proposed. Simulation results are presented to attest the efficacy of the proposed system.

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ID Code: 75533
Item Type: Conference Paper
Refereed: Yes
Keywords: Integration of wind turbine generators, NPC three level inverter, Space vector modulation, Unbalanced operation of NPC
DOI: 10.1109/IECON.2010.5675036
ISBN: 9781424452255
ISSN: 1553-572X
Divisions: Current > Schools > School of Electrical Engineering & Computer Science
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2010 IEEE
Deposited On: 25 Aug 2014 23:25
Last Modified: 26 Aug 2014 23:24

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