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Analyzing the Effect of Soiling on the Performance of a Photovoltaic System of Different Module Technologies in Kalkbult, South Africa
Dalarna University, School of Technology and Business Studies, Energy Technology.
2016 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

The fact that most of the large scale solar PV plants are built in arid and semi-arid areas

where land availability and solar radiation is high, it is expected the performance of the PV

plants in such locations will be affected significantly due to high cell temperature as well as

due to soiling. Therefore, it is essential to study how the different PV module technologies

will perform in such geographical locations to ensure a consistent and reliable power

delivery over the lifetime of the PV power plants.

As soiling is strongly dependent on the climatic conditions of a particular location a test

station, consisted of about 24 PV modules and a well-equipped weather station, was built

within the fences of Scatec’s 75 MW Kalkbult solar PV plant in South Africa.

This study was performed to a better understand the effect of soiling by comparing the

relative power generation by the cleaned modules to the un-cleaned modules. Such

knowledge can enable more quantitative evaluations of the cleaning strategies that are

going to be implemented in bigger solar PV power plants.

The data collected and recorded from the test station has been analyzed at IFE, Norway

using a MatLab script written for this thesis project. This thesis work has been done at

IFE, Norway in collaboration with Stellenbosch University in South Africa and Scatec

Solar a Norwegian independent power producer company.

Generally for the polycrystalline modules it is found that the average temperature

corrected efficiency during the period of the experiment has been 15.00±0.08 % and for

the thin film-CdTe with ARC is 11.52% and for the thin film without ARC is about

11.13% with standard uncertainty of ±0.01 %.

Besides, by comparing the initial relative average efficiency of the polycrystalline-Si

modules when all the modules have been cleaned for the first time and the final relative

efficiency; after the last cleaning schedule which is when all the reference modules E, F, G,

and H have been cleaned for the last time it is found that poly3 performs 2 % and 3 %

better than poly1 and poly16 respectively, poly13 performs 1 % better than poly15 as well

as poly5 and poly12 performs 1 % and 2 % better than poly10 respectively. Besides, poly5

and poly12 performs a 9 % and 11 % better than poly7. Furthermore, there is no change

in performance between poly6 and poly9 as well as poly4 and poly15. However, the

increase in performance of poly3 to poly1, poly13 to poly15 as well as poly5 and poly12 to

poly10 is insignificant.

In addition, it is found that TF22 perform 7% better than the reference un-cleaned module

TF24 and similarly; TF21 performs 7% higher than TF23. Furthermore, modules with

ARC glass (TF17, TF18, TF19, and TF20) shows that cleaning the modules with only

distilled water (TF19) or dry-cleaned after cleaned with distilled water(TF20) decreases the

performance of the modules by 5 % and 4 % comparing to its respective reference uncleanedmodules TF17 and TF18 respectively.

Place, publisher, year, edition, pages
2016.
National Category
Energy Engineering
Identifiers
URN: urn:nbn:se:du-23306OAI: oai:DiVA.org:du-23306DiVA: diva2:1043795
Available from: 2016-11-01 Created: 2016-11-01 Last updated: 2016-12-07

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