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Design and performance analysis of large horizontal axis offshore wind turbines
Dissertation (MEng (Electrical Engineering))--University of Pretoria, 2020.
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| Format: | Thesis |
| Language: | English |
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University of Pretoria
2021
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| _version_ | 1867613708064129024 |
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| access_status_str | Open Access |
| author2 | Bansal, Ramesh C. |
| author_browse | Bansal, Ramesh C. |
| author_facet | Bansal, Ramesh C. |
| collection | Thesis |
| dc_rights_str_mv | © 2019 University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means, without the prior written permission of the University of Pretoria. |
| description | Dissertation (MEng (Electrical Engineering))--University of Pretoria, 2020. |
| format | Thesis |
| id | oai:repository.up.ac.za:2263/81249 |
| institution | University of Pretoria (South Africa) |
| language | English |
| last_indexed | 2026-06-10T12:40:26.265Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UPSpace — University of Pretoria Institutional Repository |
| publishDate | 2021 |
| publishDateRange | 2021 |
| publishDateSort | 2021 |
| publisher | University of Pretoria |
| publisherStr | University of Pretoria |
| record_format | dspace |
| source_str | UPSpace — University of Pretoria Institutional Repository |
| spelling | oai:repository.up.ac.za:2263/81249 Design and performance analysis of large horizontal axis offshore wind turbines Bansal, Ramesh C. benjaminchali@yahoo.co.za Mbungu, Tresor Chalikosa, Benjamin Capacity factor Energy production System specifications and testing model Large wind turbines Offshore wind farms UCTD Dissertation (MEng (Electrical Engineering))--University of Pretoria, 2020. System specifications and testing model for increasing the rated power output, rotor diameter, hub height, and maximum tip speed of horizontal axis wind turbines is designed and implemented on the system advisor model simulator. Its performance is tested on offshore wind turbine’s direct-drive and single stage-low speed generators. Although this simulator produces impressive results, it has some limitations in the operation of wind turbines. The terrain and topography of wind turbines are not considered in the simulation process. It also does not assess the electrical transients and physical stress of wind turbine components. Despite its limitations, four large offshore wind turbines and wind farms have been successfully simulated. It is found that the 9 MW, 10 MW, 11 MW and their respective wind farms generate more energy and better capacity factor on the direct-drive than single stage-low speed generator. Furthermore, a rectangular layout of 20 wind turbines considerably impacted the excellent performance of this generator on the wind farms. Another notable outcome of the study is that higher system specifications do not always generate feasible results for wind turbines despite favourable weather conditions. For the Vestas 8 MW wind turbine, the viable percentages for increasing the size of its rated power output, rotor diameter, hub height and maximum tip speed is only 12.5%, 25% and 37.5%. The viability of these three upgrades has been confirmed by suitable graphs of power curves and feasible energy production results. Thus, these percentages confirm an 8 MW wind turbine’s attainable design limits for generating realistic energy production and capacity factor. On the contrary, a 50% increase in the above four system specifications yielded unviable capacity factor and energy production results. This is because this upgrade is too high to work successfully on the current wind turbine technology. Furthermore, the shape of the power curve from the 50% specifications is not the typical curve for wind turbines. It has been observed that increasing the value of maximum tip speed beyond 143 m/s and the rotor diameter beyond 246 m give rise to an unusual power curve. Concerning wind speed for high energy production, an average daily minimum and maximum wind speed of 4.58 m/s and 15.08 m/s yielded good results. Given the prevailing trend of designing large wind turbines, findings in this study are particularly helpful in understanding how capacity factor, energy production and energy losses are affected by the size of system specifications. Not only that, but these findings also have fundamental concepts that can be used to optimize the design of large offshore wind turbines. The study is equally valuable for determining suitable weather conditions and wind power potential for large offshore wind farm sites. Electrical, Electronic and Computer Engineering MEng (Electrical Engineering) Unrestricted 2021-08-13T06:30:46Z 2021-08-13T06:30:46Z 2021-09 2020 Dissertation * S2021 http://hdl.handle.net/2263/81249 en © 2019 University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means, without the prior written permission of the University of Pretoria. application/pdf University of Pretoria |
| spellingShingle | Capacity factor Energy production System specifications and testing model Large wind turbines Offshore wind farms UCTD Design and performance analysis of large horizontal axis offshore wind turbines |
| title | Design and performance analysis of large horizontal axis offshore wind turbines |
| title_full | Design and performance analysis of large horizontal axis offshore wind turbines |
| title_fullStr | Design and performance analysis of large horizontal axis offshore wind turbines |
| title_full_unstemmed | Design and performance analysis of large horizontal axis offshore wind turbines |
| title_short | Design and performance analysis of large horizontal axis offshore wind turbines |
| title_sort | design and performance analysis of large horizontal axis offshore wind turbines |
| topic | Capacity factor Energy production System specifications and testing model Large wind turbines Offshore wind farms UCTD |
| url | http://hdl.handle.net/2263/81249 |