TUTCRIS - Tampereen teknillinen yliopisto

TUTCRIS

Recognition and modelling of irradiance transitions caused by moving clouds

Tutkimustuotosvertaisarvioitu

Standard

Recognition and modelling of irradiance transitions caused by moving clouds. / Lappalainen, Kari; Valkealahti, Seppo.

julkaisussa: Solar Energy, Vuosikerta 112, 02.2015, s. 55-67.

Tutkimustuotosvertaisarvioitu

Harvard

APA

Vancouver

Author

Bibtex - Lataa

@article{4eab28b564584c4e9dab0a7874f0fdc4,
title = "Recognition and modelling of irradiance transitions caused by moving clouds",
abstract = "Fast irradiance transitions caused by the edges of shadows of moving clouds have various effects on the operation of photovoltaic (PV) systems. They can lead to situations where the grid inverter is not able to follow the global maximum power point causing extra losses. Fast fluctuations of the power fed to the electric grid can also cause energy balance and power quality problems. Further, partial shading of PV generators causes mismatch losses.In this paper, a method to recognize irradiance transitions caused by moving clouds from the measured extensive irradiance data is presented. A total of around 40,000 irradiance transitions were recognized from a measured data of 13 months around midsummer in 2011-2013 and their shading strength, duration, time of occurrence etc. have been analysed. It has been found that the duration of irradiance transitions varies a lot from a few seconds up to several minutes. The average duration of irradiance rises is clearly longer than that of falls. Shading strengths of transitions varies quite evenly from very thin shadings up to 90{\%} shading strength and the highest transition rates take place around noon. Furthermore, a mathematical model of the irradiance transitions has been developed and validated with the extensive set of experimental data. (C) 2014 Elsevier Ltd. All rights reserved.",
keywords = "Photovoltaic, Partial shading, Irradiance transition, Solar power generation, PHOTOVOLTAIC ARRAYS, CONFIGURATIONS",
author = "Kari Lappalainen and Seppo Valkealahti",
note = "Contribution: organisation=dee,FACT1=1<br/>Portfolio EDEND: 2014-12-10<br/>Publisher name: Elsevier Ltd",
year = "2015",
month = "2",
doi = "10.1016/j.solener.2014.11.018",
language = "English",
volume = "112",
pages = "55--67",
journal = "Solar Energy",
issn = "0038-092X",
publisher = "Elsevier",

}

RIS (suitable for import to EndNote) - Lataa

TY - JOUR

T1 - Recognition and modelling of irradiance transitions caused by moving clouds

AU - Lappalainen, Kari

AU - Valkealahti, Seppo

N1 - Contribution: organisation=dee,FACT1=1<br/>Portfolio EDEND: 2014-12-10<br/>Publisher name: Elsevier Ltd

PY - 2015/2

Y1 - 2015/2

N2 - Fast irradiance transitions caused by the edges of shadows of moving clouds have various effects on the operation of photovoltaic (PV) systems. They can lead to situations where the grid inverter is not able to follow the global maximum power point causing extra losses. Fast fluctuations of the power fed to the electric grid can also cause energy balance and power quality problems. Further, partial shading of PV generators causes mismatch losses.In this paper, a method to recognize irradiance transitions caused by moving clouds from the measured extensive irradiance data is presented. A total of around 40,000 irradiance transitions were recognized from a measured data of 13 months around midsummer in 2011-2013 and their shading strength, duration, time of occurrence etc. have been analysed. It has been found that the duration of irradiance transitions varies a lot from a few seconds up to several minutes. The average duration of irradiance rises is clearly longer than that of falls. Shading strengths of transitions varies quite evenly from very thin shadings up to 90% shading strength and the highest transition rates take place around noon. Furthermore, a mathematical model of the irradiance transitions has been developed and validated with the extensive set of experimental data. (C) 2014 Elsevier Ltd. All rights reserved.

AB - Fast irradiance transitions caused by the edges of shadows of moving clouds have various effects on the operation of photovoltaic (PV) systems. They can lead to situations where the grid inverter is not able to follow the global maximum power point causing extra losses. Fast fluctuations of the power fed to the electric grid can also cause energy balance and power quality problems. Further, partial shading of PV generators causes mismatch losses.In this paper, a method to recognize irradiance transitions caused by moving clouds from the measured extensive irradiance data is presented. A total of around 40,000 irradiance transitions were recognized from a measured data of 13 months around midsummer in 2011-2013 and their shading strength, duration, time of occurrence etc. have been analysed. It has been found that the duration of irradiance transitions varies a lot from a few seconds up to several minutes. The average duration of irradiance rises is clearly longer than that of falls. Shading strengths of transitions varies quite evenly from very thin shadings up to 90% shading strength and the highest transition rates take place around noon. Furthermore, a mathematical model of the irradiance transitions has been developed and validated with the extensive set of experimental data. (C) 2014 Elsevier Ltd. All rights reserved.

KW - Photovoltaic

KW - Partial shading

KW - Irradiance transition

KW - Solar power generation

KW - PHOTOVOLTAIC ARRAYS

KW - CONFIGURATIONS

U2 - 10.1016/j.solener.2014.11.018

DO - 10.1016/j.solener.2014.11.018

M3 - Article

VL - 112

SP - 55

EP - 67

JO - Solar Energy

JF - Solar Energy

SN - 0038-092X

ER -