Presented at: 9th CIGRE Southern Africa Regional Conference, Johannesburg, South Africa, 1-4 Octo... more Presented at: 9th CIGRE Southern Africa Regional Conference, Johannesburg, South Africa, 1-4 October 2019.
The paper presents results from an inter laboratory comparison (ILC) of crystalline silicon PV mo... more 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, and voltage measurements and compares power to the stated uncertainties for the measurements. The paper also explains the basics of PV module performance measurements, the link to PV module nameplate ratings, and describes the sources of uncertainty in the measurements. The results of the 2019 ILC I-V measurements among three South African institutions show differences of +/-2.0% or less for maximum power measurements of crystalline PV modules, relative to the CSIR results. These differences are within the stated uncertainty for the measurements but greater than the +/-0.5% differences among international reference labs reported in a 2017.
This paper outlines the initial results for power quality analysis (PQA) of a single phase 3.3kWp... more 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), Pretoria campus. The purpose of this study is to understand the harmonic distortion behaviours for three different sky conditions: clear, moderate and cloudy condition. The measured current harmonic distortions are categorized to different order intervals as per NRS 097-2-1:2017. The categorized maximum current harmonic distortions of each hour interval within a day are compared against the requirements stipulated in NRS 097-2-1:2017. The measured current harmonic distortions are inclusive of existing harmonics in the building, hence it is difficult to quantify the harmonics generated from the solar PV. The future plans include measurement of these harmonics in the building without PV to determine the baseline and then calculate the harmonic distortions originating from the PV system for different sky conditions.
2020 International SAUPEC/RobMech/PRASA Conference, 2020
Photovoltaic modules are normally tested under standard test conditions defined by the Internatio... more Photovoltaic modules are normally tested under standard test conditions defined by the International Electrotechnical Commission, but these conditions are different from typical field condition. The standard test conditions for PV modules is specified as 1000 W/m2 irradiance and 25°C cell temperature and reference spectral American Society for Testing and Materials (ASTM) G173. The light source may be natural or simulated, but it must match the reference standard as described in IEC 60904–3. The effect of spectral variations on the 1-V measurements can may have a big impact on the accuracy of the performance measurements. This effect was quantified during in this the study at the Indoor and Outdoor PV testing facility in Council for Scientific and Industrial research, Energy Initiative Pretoria campus. Results show different spectral mismatch values were obtained when two different spectral reference cells were used on the indoor measurements of modules under test. The obtained spec...
Presented: 5TH Southern African Solar Energy Conference (SASEC 2018), 25-27 June 2018, Blue Water... more Presented: 5TH Southern African Solar Energy Conference (SASEC 2018), 25-27 June 2018, Blue Waters Hotel, Durban, South Africa
Presented at: 9th CIGRE Southern Africa Regional Conference, Johannesburg, South Africa, 1-4 Octo... more Presented at: 9th CIGRE Southern Africa Regional Conference, Johannesburg, South Africa, 1-4 October 2019.
Presented at:6th Southern African Solar Energy Conference (SASEC), Mpekweni Beach Resort, Eastern... more Presented at:6th Southern African Solar Energy Conference (SASEC), Mpekweni Beach Resort, Eastern Cape Province, South Africa, 25th-27th November 2019.
Presented at: 9th CIGRE Southern Africa Regional Conference, Johannesburg, South Africa, 1-4 Octo... more Presented at: 9th CIGRE Southern Africa Regional Conference, Johannesburg, South Africa, 1-4 October 2019.
The paper presents results from an inter laboratory comparison (ILC) of crystalline silicon PV mo... more 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, and voltage measurements and compares power to the stated uncertainties for the measurements. The paper also explains the basics of PV module performance measurements, the link to PV module nameplate ratings, and describes the sources of uncertainty in the measurements. The results of the 2019 ILC I-V measurements among three South African institutions show differences of +/-2.0% or less for maximum power measurements of crystalline PV modules, relative to the CSIR results. These differences are within the stated uncertainty for the measurements but greater than the +/-0.5% differences among international reference labs reported in a 2017.
This paper outlines the initial results for power quality analysis (PQA) of a single phase 3.3kWp... more 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), Pretoria campus. The purpose of this study is to understand the harmonic distortion behaviours for three different sky conditions: clear, moderate and cloudy condition. The measured current harmonic distortions are categorized to different order intervals as per NRS 097-2-1:2017. The categorized maximum current harmonic distortions of each hour interval within a day are compared against the requirements stipulated in NRS 097-2-1:2017. The measured current harmonic distortions are inclusive of existing harmonics in the building, hence it is difficult to quantify the harmonics generated from the solar PV. The future plans include measurement of these harmonics in the building without PV to determine the baseline and then calculate the harmonic distortions originating from the PV system for different sky conditions.
2020 International SAUPEC/RobMech/PRASA Conference, 2020
Photovoltaic modules are normally tested under standard test conditions defined by the Internatio... more Photovoltaic modules are normally tested under standard test conditions defined by the International Electrotechnical Commission, but these conditions are different from typical field condition. The standard test conditions for PV modules is specified as 1000 W/m2 irradiance and 25°C cell temperature and reference spectral American Society for Testing and Materials (ASTM) G173. The light source may be natural or simulated, but it must match the reference standard as described in IEC 60904–3. The effect of spectral variations on the 1-V measurements can may have a big impact on the accuracy of the performance measurements. This effect was quantified during in this the study at the Indoor and Outdoor PV testing facility in Council for Scientific and Industrial research, Energy Initiative Pretoria campus. Results show different spectral mismatch values were obtained when two different spectral reference cells were used on the indoor measurements of modules under test. The obtained spec...
Presented: 5TH Southern African Solar Energy Conference (SASEC 2018), 25-27 June 2018, Blue Water... more Presented: 5TH Southern African Solar Energy Conference (SASEC 2018), 25-27 June 2018, Blue Waters Hotel, Durban, South Africa
Presented at: 9th CIGRE Southern Africa Regional Conference, Johannesburg, South Africa, 1-4 Octo... more Presented at: 9th CIGRE Southern Africa Regional Conference, Johannesburg, South Africa, 1-4 October 2019.
Presented at:6th Southern African Solar Energy Conference (SASEC), Mpekweni Beach Resort, Eastern... more Presented at:6th Southern African Solar Energy Conference (SASEC), Mpekweni Beach Resort, Eastern Cape Province, South Africa, 25th-27th November 2019.
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Papers by Siyasanga May