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A Simulation Analysis of Photovoltaic AC Module Integrated Converters in Parallel, under Controlled Edge Shading Conditions
O'Callaghan, Lynette; McKeever, Michael; Norton, Brian
A DC and AC power simulation comparison of: a Photovoltaic (PV) array with a modular, parallel, AC converter configuration; and a series, string configuration with a central AC converter, is presented. The systems are simulated using a comprehensive range of edge shading scenarios and irradiance conditions. Power control and transformation circuitry must be designed for shade and module mismatch tolerance to prevent over-proportional power to shade losses, as average losses from Building Integrated PV (BIPV) systems are approximately 20 to 25%, due to shade, mismatch, differences in orientation and inclination, and temperature effects. 59.4% of the simulations showed gains in AC power by using the parallel modular converter system, with a maximum gain of 10.74%, when compared with the series configuration. Losses up to 6.61% can be experienced when most of the modules are experiencing edge shading of 200 or 400W/m2, as i) the converter efficiency is lower in this power range for the modular converter, and ii) this low efficiency conversion occurs n times, where n is the number of modules in the array. Significant power increases are experienced by the parallel modular system when there is a wide distribution of irradiance levels within the shading pattern.
Keyword(s): Photovoltaic; Converter; AC; Inverter; microinverter; MIC; AC MIC; configuration; model; simulation; BIPV; losses; gains; Computer and Systems Architecture; Energy Systems; Mechanical Engineering
Publication Date:
2012
Type: Other
Peer-Reviewed: Unknown
Contributor(s): TECHNOLOGICAL SECTOR RESEARCH (2007) STRAND III; SOLAR ENERGY APPLICATION AND RESEARCH: IRELAND SEAR: IRELAND
Institution: Dublin Institute of Technology
Citation(s): Conference Papers
Publisher(s): Dublin Institute of Technology
File Format(s): application/pdf
First Indexed: 2016-10-08 07:05:52 Last Updated: 2017-12-14 07:01:30