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Browsing by Author "Pratt, Lawrence E"

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A benchmark dataset for defect detection and classification in electroluminescence images of PV modules using semantic segmentation

Author: Pratt, Lawrence E ; Matheus, Jana ; Klein, R Date: Dec 2023 Electroluminescence (EL) images enable defect detection in solar photovoltaic (PV) modules that are otherwise invisible to the naked eye, much the same way an x-ray enables a doctor to detect cracks and fractures in bones. This paper presents ... Read more c b n d
Characterization of solar photovoltaic modules in outdoor and indoor conditions

Author: Mkasi, Hlaluku W ; May, Siyasanga I ; Basappa Ayanna, Manjunath ; Pratt, Lawrence E ; Roro, Kittessa T Date: Oct 2019 This paper summarizes the results of solar photovoltaic (PV) module electrical characterization under outdoor and indoor conditions in the Republic of South Africa. Under outdoor conditions, the bi-facial PV modules on fixed racks and dual-axis ... Read more
Defect detection and quantification in electroluminescence images of solar PV modules using U-net semantic segmentation

Author: Pratt, Lawrence E ; Govender, Devashen ; Klein, R Date: Nov 2021 Electroluminescence (EL) images enable defect detection in solar photovoltaic (PV) modules that are otherwise invisible to the naked eye, much the same way an x-ray enables a doctor to detect cracks and fractures in bones. The prevalence of ... Read more
The effect of soiling on the PV performance ratio for different PV systems

Author: Mienie, S ; Basappa Ayanna, Manjunath ; Pratt, Lawrence E ; Roro, Kittessa T ; Diale, M Date: Jun 2018 Soiling is an important and unpredictable factor that affects PV plant performance. Soiling is dependent on so many factors making it hard to quantify and accurately incorporate in PV prediction models and levelized cost of electricity (LCOE). ... Read more
Effect of using global horizontal or plane of array irradiance for monitoring sun tracking solar photovoltaic plants performance

Author: Basappa Ayanna, Manjunath ; Pratt, Lawrence E ; Mienie, S ; Roro, Kittessa T Date: Jun 2018 The performance ratio (PR) is a metric commonly used for assessing the performance of a photovoltaic (PV) plants worldwide. The standard PR calculation method (PRPoA) used in solar PV industry as per the International Electro-technical ... Read more
Electroluminescence imaging of photovoltaic modules

Author: Malefafana, MT ; Pratt, Lawrence E ; Basappa Ayanna, Manjunath ; Roro, Kittessa T Date: Oct 2019 Electroluminescence (EL) imaging is a non-destructive characterization technique used widely across the solar PV industry. Similar to an x-ray image, the EL image allows the analyst to peer inside the PV module and see features that are ... Read more
The field performance of a 558 kWp ground mounted single-axis PV system in Pretoria, South Africa

Author: Roro, Kittessa T ; Basappa Ayanna, Manjunath ; Pratt, Lawrence E ; Lekoloane, Gaoshitwe A ; Klein, Peter ; Koopman, Stephen J Date: Dec 2017 According to a recent Green Tech Media (GTM) publication [Moskowitz, 2017], 23% of all ground-mounted photovoltaic (PV) systems are installed on trackers. Trackers are especially beneficial for commercial and utility scale applications, ... Read more
Field performance of bifacal modules in South Africa

Author: Basappa Ayanna, Manjunath ; Mkasi, Hlaluku W ; Pratt, Lawrence E ; Roro, Kittessa T Date: Nov 2019 This study presents the initial results of field performance analysis conducted on bi-facial modules installed on a fixed tilt rack and dual axis tracker system in Pretoria, South Africa. Bifacial modules produce better energy yield compared ... Read more
Financial benefits of integrating east–west fixed, single and dual axes tracking PV systems in the supply mix of a South African Research Campus

Author: Tazvinga, Henerica ; Moholisa, Tsolo E ; Basappa Ayanna, Manjunath ; Pratt, Lawrence E ; Hlatshwayo, Mluleki C ; Mushwana, Crescent Date: Aug 2018 The use of Photovoltaic (PV) systems in distribution networks has increased in the past few years. The benefits of PV systems connected to the grid include reducing the carbon footprint, improving energy access, and security as well as the ... Read more
Global irradiance on photovoltaic array

Author: Mkasi, Hlaluku W ; Basappa Ayanna, Manjunath ; Pratt, Lawrence E ; Roro, Kittessa T Date: Jun 2018 The amount of available solar irradiance is the most important parameter to determine solar energy generation for any given location. Satellite-based irradiance data is often used as a basis for predicting the energy generation for any location, ... Read more
Impact of measured spectrum variation on solar photovoltaic efficiencies worldwide

Author: Kinsey, GS ; Riedel-Lyngskær, NC ; Miguel, A ; Boyd, M ; Braga, M ; Shou, C ; Cordero, RR ; Duck, BC ; Maweza, Elijah L ; Pratt, Lawrence E Date: Aug 2022 In photovoltaic power ratings, a single solar spectrum, AM1.5, is the de facto standard for record laboratory efficiencies, commercial module specifications, and performance ratios of solar power plants. More detailed energy analysis that ... Read more
The importance of PV module reliability research in South Africa

Author: Pratt, Lawrence E ; Roro, Kittessa T ; Basappa Ayanna, Manjunath Date: Jun 2018 This paper will introduce the new C450 international standard for PV module quality assurance programs. Quality assurance testing has been on the rise in the PV industry following the rise in development of large scale PV plants, sometimes ... Read more
Inter laboratory comparison of indoor performance tests on crystalline silicon solar PV modules

Author: Pratt, Lawrence E ; Basappa Ayanna, Manjunath ; May, Siyasanga I ; Roro, Kittessa T ; McCleland, JC ; Zikhali, Q Date: Nov 2019 The paper presents results from an inter laboratory comparison (ILC) of crystalline silicon PV module performance measurements from three different institutions within South Africa. The analysis quantifies the differences in power, current, ... Read more
Modelling photovoltaic power output using machine Learning techniques

Author: May, Siyasanga I ; Pratt, Lawrence E ; Roro, Kittessa T ; Bokoro, P Date: Aug 2022 This work focuses on modelling the power output of multiple PV technologies installed at the outdoor test facility of the Council for Scientific and Industrial Research (CSIR) in Pretoria. Extreme Gradient Boosting (XGB) and Artificial Neural ... Read more
Power output predictions of photovoltaic system using machine learning

Author: May, Siyasanga I ; Pratt, Lawrence E ; Roro, Kittessa T ; Bokoro, P Date: Nov 2021 This work focuses on developing prediction models for the power output of multiple PV technologies installed at the outdoor test facility on the Pretoria campus of the Council for Scientific and Industrial Research. Random Forest (RF) and ... Read more
Power quality analysis of a grid tied 3.3 kWp rooftop solar photovoltaic system with battery storage

Author: May, Siyasanga I ; Basappa Ayanna, Manjunath ; Pratt, Lawrence E ; Mienie, S ; Roro, Kittessa T Date: Jun 2019 This paper outlines the initial results for power quality analysis (PQA) of a single phase 3.3kWp photovoltaic (PV) system with battery storage connected to a low-voltage system at the Council for Scientific and Industrial Research (CSIR), ... Read more
Power quality analysis of low voltage grid-tied network with PV system

Author: Mnisi, MI ; Bokoro, P ; Roro, Kittessa T ; Basappa Ayanna, Manjunath ; Pratt, Lawrence E Date: Nov 2019 Power quality analysis (PQA) in power systems has become important to consider since there has been an increase in distributed energy resources installed on the existing grid, particularly in the area of renewable energy generation. South ... Read more
PV module reliability scorecard - Round 1

Author: Pratt, Lawrence E ; Basappa Ayanna, Manjunath ; May, Siyasanga I ; Mkasi, Hlaluku W ; Maweza, Elijah L ; Roro, Kittessa T Date: Nov 2021 Solar PV system component reliability is key to longterm success for the PV industry, given the 25-year lifespan of PV generators. PV modules are one key component needed to deliver on the lifetime production of PV systems, as they are the ... Read more
Solar PV indoor and outdoor testing

Author: Pratt, Lawrence E Date: Oct 2018 Presentation on the solar PV indoor and outdoor testing. Read more
Solar PV inverter characterization in indoor laboratory

Author: Basappa Ayanna, Manjunath ; Pratt, Lawrence E ; Roro, Kittessa T Date: Nov 2021 A commercial 3ph 25 kW inverter is characterised at the Smart Grid Laboratory, CEA-INES in accordance with IEC/EN 61727 and EN50530. The minimum, nominal and maximum power point tracking power conversion efficiency for normalized power levels ... Read more

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