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The Effect of Low Insolation Conditions and Inverter Oversizing on the Long-Term Performance of a Grid-Connected Photovoltaic System

Biomedical Sciences Research Institute Computer Science Research Institute Environmental Sciences Research Institute Nanotechnology & Advanced Materials Research Institute

Mondol, Jayanta Deb, Yohanis, Yigsaw and Norton, Brian (2007) The Effect of Low Insolation Conditions and Inverter Oversizing on the Long-Term Performance of a Grid-Connected Photovoltaic System. Progress in Photovoltaics: Research and Applications, 15 . pp. 353-368. [Journal article]

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DOI: 10.1002/pip.742

Abstract

The performance of a roof mounted grid-connected photovoltaic (PV) system inNorthern Ireland was monitored over 3 years on annual, seasonal and monthly bases.The overall system performance was adversely affected by low insolation conditions;19% of total incident insolation was absorbed at irradiance level below 200 W/m2 and67% below 600 W/m2, only 6.2% above 900 W/m2. In summer and winter, the PVandsystem efficiencies were 9.0 and 8.5%, and 7.8 and 7.5%, respectively and inverterefficiencies were 86.8 and 85.8%, respectively. The inverter for this particular systemwas oversized; 77% of the total DC energy produced when inverter’s operating loadwas 50% of its rated capacity. The annual average monthly system performance ratio(PR) was 0.61 with seasonal variation 0.59 to 0.63. The average monthly PV, system andinverter efficiencies over the whole monitored period were 8.8, 7.6 and 86.8%, respectively. The main losses of the system were inverter DC/AC conversion loss, inverterthreshold loss and low insolation loss.

Item Type:Journal article
Keywords:monitoring; grid-connected photovoltaics; performance ratio; PV efficiency; inverter efficiency
Faculties and Schools:Faculty of Art, Design and the Built Environment
Faculty of Art, Design and the Built Environment > School of the Built Environment
Research Institutes and Groups:Built Environment Research Institute
Built Environment Research Institute > Centre for Sustainable Technologies (CST)
ID Code:2324
Deposited By:Dr Jayanta Mondol
Deposited On:30 Nov 2009 15:40
Last Modified:30 Nov 2009 15:40

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