Experimental observations in mismatch losses in monofacial and bifacial PV generators

Rossa, Carlos H. and Martínez Moreno, Francisco and Lorenzo Pigueiras, Eduardo (2021). Experimental observations in mismatch losses in monofacial and bifacial PV generators. "Progress in Photovoltaics", v. n/a (n. n/a); pp. 1-13. ISSN 1062-7995. https://doi.org/10.1002/pip.3447.

Description

Title: Experimental observations in mismatch losses in monofacial and bifacial PV generators
Author/s:
  • Rossa, Carlos H.
  • Martínez Moreno, Francisco
  • Lorenzo Pigueiras, Eduardo
Item Type: Article
Título de Revista/Publicación: Progress in Photovoltaics
Date: 1 July 2021
ISSN: 1062-7995
Volume: n/a
Subjects:
Freetext Keywords: Mismatch Losses, Bifacial PV generators, Monofacial PV generators, Rear irradiance, Non-uniformity rear irradiance, Ageing, Temperature dispersion
Faculty: Instituto de Energía Solar (IES) (UPM)
Department: Ingeniería Telemática y Electrónica
UPM's Research Group: Sistemas Fotovoltáicos
Creative Commons Licenses: None

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Abstract

Mismatch losses (MML) in PV arrays have been experimentally investigated by observing the dispersion in the operating voltage of the individual modules under normal operating conditions, i.e., with the inverter delivering energy to the grid; and by assuming that in the absence of mismatch, all the modules will have the same operating voltage which are equal to the observed average. For that, a quadratic relationship between relative power and relative voltage deviations derived from the power- voltage curve of the modules is required. This has been carried out in two different PV generators: a 5.1 kWp with monofacial multicrystalline BSF modules installed in March 2013, and a 6.6 kWp with bifacial monocrystalline PERC modules, installed in May 2019. The respective coefficient of variation of the STC power is 1.6% and 0.3%. This decrease reflects the improvement between these two PV technologies, and translates into a reduction in the MML component derived from intrinsic differences in the constitution of the module, from 0.09% to 0.01%, following theoretical considerations. The MML component due to the non-uniformity of rear irradiance in the bifacial PV array is deduced by comparing its functioning with and without the rear side of the modules covered by opaque canvas and results in about 0.2- 0.4%, which represents half of the total observed MML. The difference between these components and the total MML observed is attributed to differences in the module operating temperature. The ageing of the monofacial PV array translates into an increase in MML at a ratio of 0.04% per year.

Funding Projects

TypeCodeAcronymLeaderTitle
Madrid Regional GovernmentS2018/EMT-4308MADRID-PV2-CMUnspecifiedUnspecified

More information

Item ID: 67633
DC Identifier: https://oa.upm.es/67633/
OAI Identifier: oai:oa.upm.es:67633
DOI: 10.1002/pip.3447
Official URL: https://doi.org/10.1002/pip.3447
Deposited by: Prof. Eduardo Lorenzo Pigueiras
Deposited on: 07 Jul 2021 05:58
Last Modified: 07 Jul 2021 05:58
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