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Optimization of offshore direct drive wind turbine generators with consideration of permanent magnet grade and temperature / Nurul Azim Bhuiyan; Alasdair McDonald

IEEE Transactions on Energy Conversion

Swansea University Author: Bhuiyan, Nurul Azim

Abstract

In this paper, the main objective is to optimize permanent magnet synchronous generators for offshore direct drive wind turbine, examining the best choice of magnet grades, BHmax and working temperature. A surface-mounted Nd-Fe-B generator is designed electromagnetically and structurally and optimiz...

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Published in: IEEE Transactions on Energy Conversion
ISSN: 0885-8969 1558-0059
Published: IEEE Power & Energy Society 2018
Online Access: Check full text

URI: https://cronfa.swan.ac.uk/Record/cronfa45487
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Abstract: In this paper, the main objective is to optimize permanent magnet synchronous generators for offshore direct drive wind turbine, examining the best choice of magnet grades, BHmax and working temperature. A surface-mounted Nd-Fe-B generator is designed electromagnetically and structurally and optimized for different rated powers of 6, 8 and 10 MW. The results show that the cost of energy decreases as the wind turbine’s rated power increases. Further optimizations were carried out using different neodymium magnet grades and it was found that the higher magnet grades produce a lower cost of energy. In addition, steps were taken to estimate the effect of magnet temperature. A detailed thermal model is used to calculate the cooling airflow requirements to bring the magnet operating temperature from 120°C to 80°C. Allowing the use of cheaper temperature grades of magnets, the additional cooling reduces winding losses and improves the effective BHmax of the magnets.
Keywords: Cooling system, cost of energy, magnet grade, optimization, permanent magnet generator, thermal model, wind turbine.
College: College of Engineering