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Optimal sizing of hybrid utility-scale photovoltaics and pumped hydro storage plants
Thesis (MEng)--Stellenbosch University, 2023.
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| Format: | Thesis |
| Language: | en_ZA en_ZA |
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Stellenbosch : Stellenbosch University
2023
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| _version_ | 1867614104125964288 |
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| access_status_str | Open Access |
| author | De Kock, Andrew |
| author2 | Rix, Arnold J.
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| author_browse | De Kock, Andrew Rix, Arnold J. |
| author_facet | Rix, Arnold J.
De Kock, Andrew |
| author_sort | De Kock, Andrew |
| collection | Thesis |
| dc_rights_str_mv | Stellenbosch University |
| description | Thesis (MEng)--Stellenbosch University, 2023. |
| format | Thesis |
| id | oai:scholar.sun.ac.za:10019.1/127120 |
| institution | Stellenbosch University (South Africa) |
| language | en_ZA en_ZA |
| last_indexed | 2026-06-10T12:46:43.557Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from SUNScholar — Stellenbosch University Repository |
| publishDate | 2023 |
| publishDateRange | 2023 |
| publishDateSort | 2023 |
| publisher | Stellenbosch : Stellenbosch University |
| publisherStr | Stellenbosch : Stellenbosch University |
| record_format | dspace |
| source_str | SUNScholar — Stellenbosch University Repository |
| spelling | oai:scholar.sun.ac.za:10019.1/127120 Optimal sizing of hybrid utility-scale photovoltaics and pumped hydro storage plants De Kock, Andrew Rix, Arnold J. Stellenbosch University. Faculty of Engineering. Dept. of Electrical and Electronic Engineering. Pumped storage power plants -- South Africa Renewable energy sources -- South Africa Hybrid power systems -- South Africa Photovoltaic power generation -- South Africa Thesis (MEng)--Stellenbosch University, 2023. ENGLISH ABSTRACT: Load shedding has increased in South Africa, leaving millions without electricity. The country is thus in dire need of new power-producing systems to oppose the current lack of electricity. Renewable energy is at the forefront of energy discussions for future energy production. However, they require storage due to their reliance on the weather and, consequently, their stochastic and intermittent nature. One such storage method is pumped hydro, which uses potential energy to store electricity instead of chemical energy, as in the case of batteries. Combining pumped hydro storage (PHS) with an additional power source creates a hybrid power supply (HPS) system, where an HPS is the combination of two or more power sources to create a single power-producing system. This raises the question of how to size such an HPS system for a given scenario since no known publicly available software can produce a practical solution. The aim of this thesis is to develop software that allows the user to optimally size a utility-scale HPS system. This desired HPS system is customised for the user’s requirements and consists of an integration of both a photovoltaic (PV)- and PHS system. Two independent models are created: one for the PV system and another for the PHS system. Then these two models are combined with additional ones to create an HPS system. This hybrid system incorporates an effective operating strategy to ensure the system delivers power to the correct components when needed. A genetic algorithm is implemented to generate an optimal system that can produce power at the lowest levelised cost of energy. This solution can then be compared to other power-producing options. A financial sensitivity analysis further aids the decision-making process. The software also provides numerous solutions visually in the form of various graphs to aid in the decision-making process. Two case studies are used to demonstrate and validate the developed software, and the results are compared to industry-standard software, HOMER. A 12MW HPS system is designed for Stellenbosch in the first case study, while the second study produced an HPS system for Ceres, which incorporates their existing upper reservoir. The results indicate that the capability of the developed software surpasses that of the industry-standard software HOMER when sizing an HPS system that combines PV and PHS. The presented software thus provides the user with a tool to optimise a standalone HPS system that combines both PV and PHS while still allowing the user to determine the weights and limits of the individual components that will satisfy their unique design criteria. AFRIKAANS OPSOMMING: Die toename in beurtkrag in Suid-Afrika laat miljoen mense sonder elektrisiteit. Die land het dus dringend nuwe kragproduserende stelsels nodig om die huidige gebrek aan elektrisiteit te verlig. Hernubare energie is aan die voorpunt van energiebesprekings vir toekomstige energieproduksie. Energiestoring vir hernubare energiebronne word benodig as gevolg van die stogastiese- en onvoorspelbare aard van die natuur. Gepompte hidroberging (GHB) is ’n bergingsmetode wat potensi¨ele energie gebruik in plaas van chemiese energie om elektrisiteit te berg. Die kombinasie van GHB en ’n bykomende kragbron skep ’n hibriede kragtoevoerstelse (HKS). ’n HKS is ’n sisteem wat twee of meer kragbronne kombineer om ’n enkele kragproduserende stelsel te skep. Die vraag ontstaan nou hoe pas mens so ’n stelsel vir ’n gegewe situasie toe, aangesien geen algemeen beskikbare sagteware ’n praktiese oplossing kan produseer nie. Die doel van hierdie tesis is dus om sagteware te ontwikkel wat die gebruiker in staat stel om die grootte van ’n HKS optimaal te bepaal. Hierdie gewenste HKS pas aan by die gebruiker se vereistes en bestaan uit ’n integrasie van beide ’n fotovolta¨ıese (FV) en GHB-stelsels. Twee onafhanklike modelle word geskep, een vir die FV-stelsel en die ander vir die GHB-stelsel. Hierdie twee modelle word met bykomende modelle gekombineer om ’n HKS te produseer. Hierdie hibriedestelsel inkorporeer ’n effektiewe bedryfstrategie om te verseker dat die stelsel krag aan die regte komponente lewer. ’n Genetiese algoritme word ge¨ımplementeer om ’n optimale stelsel te genereer wat krag kan produseer teen die laagste koste. Hierdie oplossing kan dan vergelyk word met ander kragproduserende opsies. ’n Finansi¨ele sensitiwiteitsanalise word verskaf om belanghebbendes te ondersteun met die besluitnemingsprosesse. Die sagteware bied ook talle oplossings visueel aan in die vorm van verskeie grafieke om verder te help met die analise. Twee gevallestudies word gebruik om die sagteware te ondersteun en die resultate word vergelyk met bedryf-standaardsagteware, HOMER. ’n 12MW HKS is vir Stellenbosch ontwerp tydens die eerste gevallestudie, terwyl die tweede studie ’n HKS vir Ceres produseer, wat hul bestaande boonste reservoir insluit. Die resultate dui aan dat die vermo¨e van die ontwikkelde sagteware di´e van die bedryf-standaardsagteware HOMER oortref, wanneer ’n FV- en ’n GHB-stelsel gekombineer word om ’n HKS te ontwerp. Die voorgestelde sagteware bied dus aan die gebruiker ’n hulpmiddel om ’n selfstandige HKS te optimaliseer. Dit kombineer FV en GHB, terwyl dit steeds die gebruiker toelaat om die beperkinge en limiete van die individuele komponente in ag te neem. Masters 2023-03-02T08:10:58Z 2023-05-18T07:05:17Z 2023-03-02T08:10:58Z 2023-05-18T07:05:17Z 2023-03 Thesis http://hdl.handle.net/10019.1/127120 en_ZA en_ZA Stellenbosch University xviii, 141 pages : illustrations application/pdf Stellenbosch : Stellenbosch University |
| spellingShingle | Pumped storage power plants -- South Africa Renewable energy sources -- South Africa Hybrid power systems -- South Africa Photovoltaic power generation -- South Africa De Kock, Andrew Optimal sizing of hybrid utility-scale photovoltaics and pumped hydro storage plants |
| title | Optimal sizing of hybrid utility-scale photovoltaics and pumped hydro storage plants |
| title_full | Optimal sizing of hybrid utility-scale photovoltaics and pumped hydro storage plants |
| title_fullStr | Optimal sizing of hybrid utility-scale photovoltaics and pumped hydro storage plants |
| title_full_unstemmed | Optimal sizing of hybrid utility-scale photovoltaics and pumped hydro storage plants |
| title_short | Optimal sizing of hybrid utility-scale photovoltaics and pumped hydro storage plants |
| title_sort | optimal sizing of hybrid utility scale photovoltaics and pumped hydro storage plants |
| topic | Pumped storage power plants -- South Africa Renewable energy sources -- South Africa Hybrid power systems -- South Africa Photovoltaic power generation -- South Africa |
| url | http://hdl.handle.net/10019.1/127120 |
| work_keys_str_mv | AT dekockandrew optimalsizingofhybridutilityscalephotovoltaicsandpumpedhydrostorageplants |