Publication type: Conference paper
Type of review: Peer review (abstract)
Title: Verification of measured PV energy yield versus forecast and loss analysis
Authors: Carigiet, Fabian
Baumgartner, Franz
Sutterlueti, Juergen
Allet, Nicolas
Pezzotti, Manuel
Haller, Joerg
DOI: 10.4229/28thEUPVSEC2013-5BV.4.25
Proceedings: 28th European photovoltaic solar energy conference and exhibition : the most inspiringplatform for the global PV solar sector : Parc des Expositions Paris Nord Villepinte, Paris, France : conference, 30 Sep-04 Oct 2013
Conference details: 28th European Photovoltaic Solar Energy Conference and Exhibition (EU PVSEC), Paris, France, 30 September - 4 October 2013
Issue Date: 2013
Publisher / Ed. Institution: WIP-Renewable Energies
ISBN: 3-936338-33-7
Language: English
Subjects: Yield Forecast; Inverter; Performance; Shading
Subject (DDC): 
Abstract: Yield forecasting of the commercial design tool PVsyst (v5.6) is compared to the performance measurements of multi crystalline modules in Dietikon, Zurich, during 2011. The total measured horizontal irradiance was 1146 kWh/m2 in 2011. This pyranometer measurement covers 91.5% of the total annual irradiance (determined using IDAWEB data with 100% uptime for Affoltern). The historical irradiance data averaged over decades are about 11.4% (Meteonorm) or 13.6% (PVGIS) lower than the IDAWEB data in 2011. The standard deviation between 2001 and 2011 is about 4.9% with respect to IDAWEB. The measured DC performance ratio (PRDC) is 0.937 with a measurement uncertainty of ±0.031 (k=2). Simulations with manufacturer and optimised parameters showed a deviation to the measurement between 4% and 8%. A second analysis considers shading losses for different shading angles. Calculated losses are about 2% lower than simulated losses with PVsyst using a model of partial shading for a shading angle of 20°. Interesting results could be achieved by determining the loss upon limiting the inverter output power. There is only 4.4% annual loss when the inverter output power is set to a limit of 70 % for the location Dietikon in 2011.
Fulltext version: Published version
License (according to publishing contract): Licence according to publishing contract
Departement: School of Engineering
Organisational Unit: Institute of Energy Systems and Fluid Engineering (IEFE)
Appears in collections:Publikationen School of Engineering

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