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Photovoltaic based distributed generation power system protection
Dissertation (MEng)--University of Pretoria, 2017.
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| Format: | Thesis |
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University of Pretoria
2017
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| _version_ | 1867613463172349952 |
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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 | © 2017 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)--University of Pretoria, 2017. |
| format | Thesis |
| id | oai:repository.up.ac.za:2263/62807 |
| institution | University of Pretoria (South Africa) |
| last_indexed | 2026-06-10T12:36:32.683Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UPSpace — University of Pretoria Institutional Repository |
| publishDate | 2017 |
| publishDateRange | 2017 |
| publishDateSort | 2017 |
| 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:2263/62807 Photovoltaic based distributed generation power system protection Bansal, Ramesh C. reynekesda@gmail.com Naidoo, Robin van der Walt, Rhyno Lambertus Reyneke UCTD Protective relaying system Photo Voltaic system Distributed power generation system Loss of Coordination Sympathetic tripping Dissertation (MEng)--University of Pretoria, 2017. In recent years, the world has seen a significant growth in energy requirements. To meet this requirement and also driven by environmental issues with conventional power plants, engineers and consumers have started a growing trend in the deployment of distributed renewable power plants such as photovoltaic (PV) power plants and wind turbines. The introduction of distributed generation pose some serious issues for power system protection and control engineers. One of the major challenges are power system protection. Conventional distribution power systems take on a radial topology, with current flowing from the substation to the loads, yielded unidirectional power flow. With the addition of distributed generation, power flow and fault current are becoming bi-directional. This causes loss of coordination between conventional overcurrent protection devices. Adding power sources downstream of protection devices might also cause the upstream protection device to be blinded from faults. Conventional overcurrent protection is mainly based on the fault levels at specific points along the network. By adding renewable sources, the fault levels increase and become dynamic, based on weather conditions. In this dissertation, power system faults are modelled with sequence components and simulated with Digsilent PowerFactory power system software. The modeling of several faults under varying power system parameters are combined with different photovoltaic penetration levels to establish a framework under which protection challenges can be better defined and understood. Understanding the effects of distributed generation on three phase power systems are simplified by modeling power systems with sequence networks. The models for asymmetrical faults shows the limited affect which distributed generation has on power system protection. The ability of inverter based distributed generators to provide active control of phase current, irrespective of unbalanced voltage occurring in the network limits their influence during asymmetrical faults. Based on this unique ability of inverter based distributed generators (of which PV energy sources are the main type), solutions are proposed to mitigate or prevent the occurrence of loss of protection under increasing penetration levels of distributed generation. The solutions include using zero and negative sequence overcurrent protection, and adapting the undervoltage disconnection time of distributed generators based on the unique network parameters where it is used. Repeating the simulations after integrating the proposed solutions show improved results and better protection coordination under high penetration levels of PV based distributed generation. Electrical, Electronic and Computer Engineering MEng Unrestricted 2017-10-13T13:41:27Z 2017-10-13T13:41:27Z 2017-09-08 2017 Dissertation van der Walt, RLR 2017, Photovoltaic based distributed generation power system protection, MEng Dissertation, University of Pretoria, Pretoria, viewed yymmdd <http://hdl.handle.net/2263/62807> S2017 http://hdl.handle.net/2263/62807 © 2017 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 | UCTD Protective relaying system Photo Voltaic system Distributed power generation system Loss of Coordination Sympathetic tripping Photovoltaic based distributed generation power system protection |
| title | Photovoltaic based distributed generation power system protection |
| title_full | Photovoltaic based distributed generation power system protection |
| title_fullStr | Photovoltaic based distributed generation power system protection |
| title_full_unstemmed | Photovoltaic based distributed generation power system protection |
| title_short | Photovoltaic based distributed generation power system protection |
| title_sort | photovoltaic based distributed generation power system protection |
| topic | UCTD Protective relaying system Photo Voltaic system Distributed power generation system Loss of Coordination Sympathetic tripping |
| url | http://hdl.handle.net/2263/62807 |