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Title [sv]
Design av PV-system för minimerad inverkan av skuggning
Title [en]
Design of a PV-system for minimized impact of shadowing
Abstract [sv]
Projektet avser att undersöka effekter av kontrollerad skuggning på elproduktion från solceller monterade i en experimentinstallation liksom på större solcells-installationer på byggnader. Målsättningen är att skriva en handbok för att minimera skuggningsproblem.
Abstract [en]
Solar cells are very sensitive for shadowing. The cell in a series connected circuit which receives the lowest irradiance will limit the performance. It is important to understand and minimize the impact of shadowing, since a high fraction of solar cells will be installed on existing buildings with shadow problems. The modules can be connected in a series or parallel. Then by pass diodes can be connected in strategically positions for decreasing the impact of shadowing by taking over the current. Module inverters or power optimizers can be connected over the module so each module will work independently. The impact of shadowing will be investigated on laboratory system with diodes, module inverters and optimizers in HIG, Gävle and on large installation with shadow problems at familjebostäder in Rinkeby. Thin film and silicon modules will be investigated. The goal is to write a handbook for minimizing the effects of shadowing on PV-modules.
Publications (2 of 2) Show all publications
Gallardo-Saavedra, S. & Karlsson, B. O. (2018). Simulation, validation and analysis of shading effects on a PV system. Solar Energy, 170, 828-839
Open this publication in new window or tab >>Simulation, validation and analysis of shading effects on a PV system
2018 (English)In: Solar Energy, ISSN 0038-092X, E-ISSN 1471-1257, Vol. 170, p. 828-839Article in journal (Refereed) Published
Abstract [en]

A simulation program for calculating the IV-curve for series connected PV-modules during partial shadowing has been developed and experimentally validated. The software used for modelling the modules is LTspice IV. The validation has been done by means of a comparative analysis using the experimental results obtained in a set of tests performed on the mono-crystalline modules of the Gävle University's laboratory in Sweden. Experimental measurements were carried out in two groups. The first group is a string of six modules with bypass diodes while the second one corresponds to a single PV module. The simulation results of both groups demonstrated a remarkable agreement with the experimental data, which means that the designed model can be used for simulating the influence of shading on the power of a string. The model has been used for analysing the performance of strings of PV modules with shadows and the benefits of installing DC-DC optimizers or module inverters, that minimise the impact of shading, have been investigated.

Place, publisher, year, edition, pages
Elsevier, 2018
Keywords
Bypass diode, DC-DC optimizer, PV modelling, Single-diode
National Category
Energy Systems
Identifiers
urn:nbn:se:hig:diva-27356 (URN)10.1016/j.solener.2018.06.035 (DOI)000442713900076 ()2-s2.0-85048298570 (Scopus ID)
Funder
Swedish Energy Agency, P38194-1
Note

Funding information:

Applied PV research and development program SoEl

Swedish industries through Energiforsk

Available from: 2018-06-25 Created: 2018-06-25 Last updated: 2019-10-01Bibliographically approved
Francisco Contero, J., Gomes, J., Gustafsson, M. & Karlsson, B. O. (2017). The impact of shading in the performance of three different solar PV systems. In: PROCEEDINGS OF THE 11TH ISES EUROSUN 2016 CONFERENCE: . Paper presented at 11th ISES EuroSun Conference, 11-14 October 2017, Palma, Spain (pp. 1168-1179). INTL SOLAR ENERGY SOC
Open this publication in new window or tab >>The impact of shading in the performance of three different solar PV systems
2017 (English)In: PROCEEDINGS OF THE 11TH ISES EUROSUN 2016 CONFERENCE, INTL SOLAR ENERGY SOC , 2017, p. 1168-1179Conference paper, Published paper (Refereed)
Abstract [en]

Partial shading decreases the performance of PV modules due to the series connection between the solar cells. In the recent years, several new technologies have emerged within the photovoltaics field to mitigate the effect of shading in the performance of the PV modules. For an accurate assessment of the performance of these devices, it is required to evaluate them comparatively in different circumstances. Three systems with six series-connected PV modules (each containing 60 cells) have been installed at the University of Gavle. System One comprises a string inverter system with 6 PV modules; System Two features a DC-DC optimizer per panel and a string inverter; System Three incorporates three micro inverters for six modules. A major conclusion of this study was that under partial shading of one (or more) modules both System Two (DC-DC optimizers) and System Three (micro inverters) perform considerably better than System One (string inverter), as long as the Impp of the shadowed module is lower than the Impp of the unshaded string It is also important that the Vmpp in the shaded module is higher than the lowest allowed voltage of the DC-DC optimizer or module inverter. The economic implications of the usage of these devices were also analyzed.

Place, publisher, year, edition, pages
INTL SOLAR ENERGY SOC, 2017
Keywords
Shading; PV-cells; DC-DC; inverter; installation; Impp; Vmpp; Pmax
National Category
Energy Systems
Identifiers
urn:nbn:se:hig:diva-26397 (URN)10.18086/eurosun.2016.08.25 (DOI)000426895100118 ()
Conference
11th ISES EuroSun Conference, 11-14 October 2017, Palma, Spain
Funder
Swedish Energy Agency, P38194-1
Available from: 2018-04-03 Created: 2018-04-03 Last updated: 2019-11-05Bibliographically approved
Principal InvestigatorKarlsson, Björn O.
Coordinating organisation
University of Gävle
Funder
Period
2014-02-01 - 2016-01-31
National Category
Energy Engineering
Identifiers
DiVA, id: project:294Project, id: P38194-1_Energi

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