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Development of an online broadband impedance spectroscopy extraction system of PV modules through switch-mode converters
Solar PV systems have traditionally relied on terminal DC current and voltage characteristics for online diagnostics. This approach monitors the current and voltage levels of a module, and a change in these levels indicates a system anomaly. However, this information only alerts to a decrease in the...
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| Format: | Thesis |
| Language: | Eng |
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Department of Electrical Engineering
2024
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| _version_ | 1867613687894769664 |
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| access_status_str | Open Access |
| author | Shelembe, Lindani |
| author2 | Barendse, Paul |
| author_browse | Barendse, Paul Shelembe, Lindani |
| author_facet | Barendse, Paul Shelembe, Lindani |
| author_sort | Shelembe, Lindani |
| collection | Thesis |
| description | Solar PV systems have traditionally relied on terminal DC current and voltage characteristics for online diagnostics. This approach monitors the current and voltage levels of a module, and a change in these levels indicates a system anomaly. However, this information only alerts to a decrease in the current or voltage levels, but not the possible cause(s) for the anomaly. To enable more detailed online diagnostics, linear impedance spectroscopy, a frequency-based characterization technique implemented through a DC-DC switch-mode converter, has been shown to provide fast and reliable impedance information that can be utilized to diagnose the condition of batteries and fuel cells in real-time. However, the implementation of this technique in a PV system presents challenges that have not been identified or addressed in current research. To develop such a system for a solar PV module, an excitation source with wide loop bandwidth capabilities is required to account for the broader impedance bandwidth of a PV module compared to batteries or fuel cells. The excitation signals must be designed such that they can minimize the nonlinearities observed at lower and higher frequencies, which result from induced excitation produced by the nonlinear DC-DC switch-mode converter. |
| format | Thesis |
| id | oai:open.uct.ac.za:11427/40409 |
| institution | University of Cape Town (South Africa) |
| language | Eng |
| last_indexed | 2026-06-10T12:40:07.114Z |
| license_str | Not specified — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UCTD — University of Cape Town Open Access Repository |
| publishDate | 2024 |
| publishDateRange | 2024 |
| publishDateSort | 2024 |
| publisher | Department of Electrical Engineering |
| publisherStr | Department of Electrical Engineering |
| record_format | dspace |
| source_str | UCTD — University of Cape Town Open Access Repository |
| spelling | oai:open.uct.ac.za:11427/40409 Development of an online broadband impedance spectroscopy extraction system of PV modules through switch-mode converters Shelembe, Lindani Barendse, Paul Electrical Engineering Solar PV systems have traditionally relied on terminal DC current and voltage characteristics for online diagnostics. This approach monitors the current and voltage levels of a module, and a change in these levels indicates a system anomaly. However, this information only alerts to a decrease in the current or voltage levels, but not the possible cause(s) for the anomaly. To enable more detailed online diagnostics, linear impedance spectroscopy, a frequency-based characterization technique implemented through a DC-DC switch-mode converter, has been shown to provide fast and reliable impedance information that can be utilized to diagnose the condition of batteries and fuel cells in real-time. However, the implementation of this technique in a PV system presents challenges that have not been identified or addressed in current research. To develop such a system for a solar PV module, an excitation source with wide loop bandwidth capabilities is required to account for the broader impedance bandwidth of a PV module compared to batteries or fuel cells. The excitation signals must be designed such that they can minimize the nonlinearities observed at lower and higher frequencies, which result from induced excitation produced by the nonlinear DC-DC switch-mode converter. 2024-07-05T13:08:24Z 2024-07-05T13:08:24Z 2023 2024-06-03T13:38:11Z Thesis / Dissertation Doctoral PhD http://hdl.handle.net/11427/40409 Eng application/pdf Department of Electrical Engineering Faculty of Engineering and the Built Environment |
| spellingShingle | Electrical Engineering Shelembe, Lindani Development of an online broadband impedance spectroscopy extraction system of PV modules through switch-mode converters |
| thesis_degree_str | Doctoral |
| title | Development of an online broadband impedance spectroscopy extraction system of PV modules through switch-mode converters |
| title_full | Development of an online broadband impedance spectroscopy extraction system of PV modules through switch-mode converters |
| title_fullStr | Development of an online broadband impedance spectroscopy extraction system of PV modules through switch-mode converters |
| title_full_unstemmed | Development of an online broadband impedance spectroscopy extraction system of PV modules through switch-mode converters |
| title_short | Development of an online broadband impedance spectroscopy extraction system of PV modules through switch-mode converters |
| title_sort | development of an online broadband impedance spectroscopy extraction system of pv modules through switch mode converters |
| topic | Electrical Engineering |
| url | http://hdl.handle.net/11427/40409 |
| work_keys_str_mv | AT shelembelindani developmentofanonlinebroadbandimpedancespectroscopyextractionsystemofpvmodulesthroughswitchmodeconverters |