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Improved cost energy comparison of permanent magnet generators for large offshore wind turbines

Hart, Kerri and McDonald, Alasdair and Polinder, Henk and Corr, Edward Joseph and Carroll, James (2014) Improved cost energy comparison of permanent magnet generators for large offshore wind turbines. In: EWEA 2014 Annual Event, 2014-03-10 - 2014-03-13.

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Abstract

This paper investigates geared and direct-drive permanent magnet generators for a typical offshore wind turbine, providing a detailed comparison of various wind turbine drivetrain configurations in order to minimise the Cost of Energy. The permanent magnet generator topologies considered include a direct-drive machine and single stage, two-stage or three-stage gearbox driven generators. The cost of energy calculations are based on initial capital costs, the costs of manufacture, installation, operations and maintenance, with particular focus on improved calculations of the annual energy yield with better availability estimations and gearbox loss modelling.