Tampere University of Technology

TUTCRIS Research Portal

Recognition of shading events caused by moving clouds and determination of shadow velocity from solar radiation measurements

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review


Original languageEnglish
Title of host publication31st European Photovoltaic Solar Energy Conference and Exhibition (31st EU PVSEC), 14– 18 September, 2015, Hamburg, Germany
Number of pages6
Publication statusPublished - 14 Sep 2015
Publication typeA4 Article in a conference publication
EventEuropean Photovoltaic Solar Energy Conference -
Duration: 1 Jan 2014 → …


ConferenceEuropean Photovoltaic Solar Energy Conference
Period1/01/14 → …


Fast variability of solar radiation is the main cause of fluctuating photovoltaic (PV) power production and shadows caused by overpassing clouds are the main reason of such variability. Fast irradiance transitions caused by the edges of shadows can lead to situations where the grid inverter is not able to follow the global maximum power point (MPP) causing extra losses. Further, fast fluctuations of the power fed to the electric grid can cause, for example, power balance and quality problems. This paper presents a method to recognize shading events caused by moving clouds from measured irradiance data. The developed recognition method has been used to analyse shading events from 15 months of full-time irradiance recordings and the results of the analysis are presented. Further, the Linear Cloud Edge (LCE) method has been used to determinate velocities of the shadows.

ASJC Scopus subject areas

Publication forum classification