A modular matrix converter for transformer-less PMSG wind generation systems

Jayasinghe, S. D. Gamini & Vilathgamuwa, D. Mahinda (2011) A modular matrix converter for transformer-less PMSG wind generation systems. In Proceedings of the 2011 IEEE Ninth International Conference on Power Electronics and Drive Systems (PEDS), IEEE, Singapore, pp. 474-479.

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An offshore wind turbine usually has the grid step-up transformer integrated in the nacelle. This increases mechanical loading of the tower. In that context, a transformer-less, high voltage, highly-reliable and compact converter system for nacelle installation would be an attractive solution for large offshore wind turbines. This paper, therefore, presents a transformer-less grid integration topology for PMSG based large wind turbine generator systems using modular matrix converters. Each matrix converter module is fed from three generator coils of the PMSG which are phase shifted by 120°. Outputs of matrix converter modules are connected in series to increase the output voltage and thus eliminate the need of a coupling step-up transformer. Moreover, dc-link capacitors found in conventional back-to-back converter topologies are eliminated in the proposed system. Proper multilevel output voltage generation and power sharing between converter modules are achieved through an advanced switching strategy. Simulation results are presented to validate the proposed modular matrix converter system, modulation method and control techniques.

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ID Code: 75125
Item Type: Conference Paper
Refereed: Yes
Keywords: Modular matrix converter, Transformer-less grid connection, Wind power
DOI: 10.1109/PEDS.2011.6147291
ISBN: 978-1-4577-0000-2
ISSN: 2164-5256
Divisions: Current > Schools > School of Electrical Engineering & Computer Science
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: © 2011 IEEE
Deposited On: 17 Aug 2014 23:24
Last Modified: 21 Aug 2014 02:23

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