LAPSE

LAPSE:2018.0748
Published Article
LAPSE:2018.0748
Error Assessment of Solar Irradiance Forecasts and AC Power from Energy Conversion Model in Grid-Connected Photovoltaic Systems
October 22, 2018
Availability of effective estimation of the power profiles of photovoltaic systems is essential for studying how to increase the share of intermittent renewable sources in the electricity mix of many countries. For this purpose, weather forecasts, together with historical data of the meteorological quantities, provide fundamental information. The weak point of the forecasts depends on variable sky conditions, when the clouds successively cover and uncover the solar disc. This causes remarkable positive and negative variations in the irradiance pattern measured at the photovoltaic (PV) site location. This paper starts from 1 to 3 days-ahead solar irradiance forecasts available during one year, with a few points for each day. These forecasts are interpolated to obtain more irradiance estimations per day. The estimated irradiance data are used to classify the sky conditions into clear, variable or cloudy. The results are compared with the outcomes of the same classification carried out with the irradiance measured in meteorological stations at two real PV sites. The occurrence of irradiance spikes in “broken cloud” conditions is identified and discussed. From the measured irradiance, the Alternating Current (AC) power injected into the grid at two PV sites is estimated by using a PV energy conversion model. The AC power errors resulting from the PV model with respect to on-site AC power measurements are shown and discussed.
Keywords
distributed generation, error assessment, irradiance spike, photovoltaic (PV) conversion model, photovoltaic systems, power profiles, Renewable and Sustainable Energy, weather forecasts
Suggested Citation
Chicco G, Cocina V, Di Leo P, Spertino F, Massi Pavan A. Error Assessment of Solar Irradiance Forecasts and AC Power from Energy Conversion Model in Grid-Connected Photovoltaic Systems. (2018). LAPSE:2018.0748
Author Affiliations
Chicco G: Energy Department, Politecnico di Torino, corso Duca degli Abruzzi 24, Torino 10129, Italy [ORCID]
Cocina V: Energy Department, Politecnico di Torino, corso Duca degli Abruzzi 24, Torino 10129, Italy [ORCID]
Di Leo P: Energy Department, Politecnico di Torino, corso Duca degli Abruzzi 24, Torino 10129, Italy
Spertino F: Energy Department, Politecnico di Torino, corso Duca degli Abruzzi 24, Torino 10129, Italy [ORCID]
Massi Pavan A: Department of Engineering and Architecture, University of Trieste, Via Valerio 10, Trieste 34127, Italy [ORCID]
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Journal Name
Energies
Volume
9
Issue
1
Article Number
E8
Year
2015
Publication Date
2015-12-24
Published Version
ISSN
1996-1073
Version Comments
Original Submission
Other Meta
PII: en9010008, Publication Type: Journal Article
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Published Article

LAPSE:2018.0748
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doi:10.3390/en9010008
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Oct 22, 2018
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CC BY 4.0
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[v1] (Original Submission)
Oct 22, 2018
 
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Oct 22, 2018
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http://psecommunity.org/LAPSE:2018.0748
 
Original Submitter
Calvin Tsay
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