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Critical Evaluation of slip synchronous wind generator technology
Thesis (PhD) -- Stellenbosch University, 2022.
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| Format: | Thesis |
| Language: | en_ZA |
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Stellenbosch : Stellenbosch University
2022
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| _version_ | 1867613950458200064 |
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| access_status_str | Open Access |
| author | Ockhuis, Dillan |
| author2 | Kamper, Maarten |
| author_browse | Kamper, Maarten Ockhuis, Dillan |
| author_facet | Kamper, Maarten Ockhuis, Dillan |
| author_sort | Ockhuis, Dillan |
| collection | Thesis |
| dc_rights_str_mv | Stellenbosch University |
| description | Thesis (PhD) -- Stellenbosch University, 2022. |
| format | Thesis |
| id | oai:scholar.sun.ac.za:10019.1/126027 |
| institution | Stellenbosch University (South Africa) |
| language | en_ZA |
| last_indexed | 2026-06-10T12:44:17.380Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from SUNScholar — Stellenbosch University Repository |
| publishDate | 2022 |
| publishDateRange | 2022 |
| publishDateSort | 2022 |
| publisher | Stellenbosch : Stellenbosch University |
| publisherStr | Stellenbosch : Stellenbosch University |
| record_format | dspace |
| source_str | SUNScholar — Stellenbosch University Repository |
| spelling | oai:scholar.sun.ac.za:10019.1/126027 Critical Evaluation of slip synchronous wind generator technology Ockhuis, Dillan Kamper, Maarten Stellenbosch University. Faculty of Engineering. Dept. of Electrical and Electronic Engineering. Synchronous generators Wind turbines Smart power grids Photovoltaic power systems Electric power distribution UCTD Thesis (PhD) -- Stellenbosch University, 2022. ENGLISH ABSTRACT: Historically, the strength and stability of an electrical power grid depended on the number of synchronous generators (SGs) connected to that grid. However, as traditional SG-based electrical power sources are replaced with converter-tied renewable energy sources (RESs), electrical power grids may become unstable following a grid disturbance. In this dissertation, it is proposed that slip synchronous wind turbine systems (SS-WTSs) be used to assist with grid stability by providing grid strength, inertia and reactive power compensation in areas with a high concentration of converter-tied RESs. An SS-WTS drivetrain fundamentally consists of a slip-permanent magnetic coupler (S-PMC) and a directly grid-tied SG, i.e., without a power converter. However, the literature regarding the design and modelling of the SG and S-PMC units in SS-WTSs for grid-tied applications is not sufficient. Firstly, the designed SGs typically have low synchronous reactance values, thus their performance is highly susceptible to grid voltage variations. Secondly, the generators designed for SS-WTSs are not grid code compliant and are thus ineligible for large-scale grid connected applications. Thirdly, the methods used to model and analyse the S-PMC unit can yield inaccurate results when predicting the maximum torque of the S-PMC, which can jeopardise the stability of the SS-WTS. Finally, there are concerns regarding the added mass and cost of the S-PMC unit. In this dissertation, optimal impedance matching for grid-tied SGs is investigated. It is found that a synchronous reactance of 0.5 per unit yields the best grid-connected performance. Furthermore, a rotor hybrid-excited design methodology for grid-tied synchronous generators is proposed and evaluated. Accurate finite-element (FE) analysis shows that the proposed hybrid-excitation method ensures that the grid-tied generator has variable-flux and hence variable reactive power compensation capabilities to comply with modern grid codes. Measured results from a novel 15 kW hybrid-excited SG verify the FE results and the grid code compliance of the generator. Additionally, in this dissertation, the FE-based, frozen permeability method is used to accurately determine the modelling parameters and performance characteristics of the S-PMC over its entire operating range. Measured results from an S-PMC prototype validate the FE analysis results. A study that compares medium- and low-speed S-PMCs at a 3 MW power rating indicates that the medium-speed S-PMC has a significantly lower cost-per-kW and active mass compared to the low-speed S-PMC. Thus, S-PMCs in high-speed SS-WTSs should be considered to reduce the overall mass and cost of the SS-WTSs. AFRIKAANSE OPSOMMING: Geen opsomming beskikbaar. Doctoral 2022-11-22T04:48:25Z 2023-01-16T12:46:26Z 2022-11-22T04:48:25Z 2023-01-16T12:46:26Z 2022-12 Thesis http://hdl.handle.net/10019.1/126027 en_ZA Stellenbosch University xix, 128 pages : illustrations application/pdf Stellenbosch : Stellenbosch University |
| spellingShingle | Synchronous generators Wind turbines Smart power grids Photovoltaic power systems Electric power distribution UCTD Ockhuis, Dillan Critical Evaluation of slip synchronous wind generator technology |
| title | Critical Evaluation of slip synchronous wind generator technology |
| title_full | Critical Evaluation of slip synchronous wind generator technology |
| title_fullStr | Critical Evaluation of slip synchronous wind generator technology |
| title_full_unstemmed | Critical Evaluation of slip synchronous wind generator technology |
| title_short | Critical Evaluation of slip synchronous wind generator technology |
| title_sort | critical evaluation of slip synchronous wind generator technology |
| topic | Synchronous generators Wind turbines Smart power grids Photovoltaic power systems Electric power distribution UCTD |
| url | http://hdl.handle.net/10019.1/126027 |
| work_keys_str_mv | AT ockhuisdillan criticalevaluationofslipsynchronouswindgeneratortechnology |