Energy yield measurement of an elevated PV system on a white flat roof and a performance comparison of monofacial and bifacial modules

Muehleisen, Wolfgang; Loeschnig, J.; Feichtner, Markus; Burgers, A.R.; Bende, E.E.; Zamini, Shokufeh; Yerasimou, Yerasimos; Kosel, Jürgen; Hirschl, Christina; Georghiou, George E.

doi:10.1016/j.renene.2021.02.015

Cited by 60 publications

(25 citation statements)

References 14 publications

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“…Equation ( 7) is a linear relation of the instantaneous I mp value with 𝐼 , , , which refers to the front surface of the bifacial module for STC condition. In a similar way, the front irradiance GF is expressed by (8), where 𝐼 , is the portion of Imp referring to the front-side contribution.…”

Section: ) Bifacial Gain Calculationmentioning

confidence: 99%

“…A comparison of monofacial and bifacial modules presenting different 𝜑 was carried out by the authors of [8]. The module with 𝜑 = 0.7 presented bifacial gain ranging from 5 to 7 % (depending on the orientation), whereas the module with 𝜑 = 0.92 presented a 3 % higher yield than the module with lower 𝜑.…”

mentioning

confidence: 99%

“…While the studies [4][5][6][7][8][9] considered monofacial modules as a comparison resource for the calculation of the bifacial gains, the present study provides a novel method for bifacial gain determination relying solely on monitoring of a bifacial array. For that, it becomes necessary to separate the power contributions of the front and rear-sides of the bifacial PV array.…”

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confidence: 99%

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Estimation of the Effective Irradiance and Bifacial Gain for PV Arrays Using the Maximum Power Current

Abe

Dias

Notton

et al. 2023

IEEE J. Photovoltaics

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Bifacial photovoltaic modules are able to convert the solar radiation reaching their front and rear-sides, which means that more electricity can be produced using the same array area as monofacial modules with similar ratings. In some locations, the cost per power unit for such a technology has already become cost-competitive with conventional monofacial modules. The so-called effective irradiance and the bifacial gain are useful metrics, respectively, to assess the solar resource and the performance of bifacial arrays. To calculate the effective irradiance, studies previously published employ rear-side irradiance measurements, whereas to compute the bifacial gain, other works make use of monofacial modules with rating similar to those of the bifacial modules under analysis. In this paper, a straightforward method is presented, allowing to calculate the effective irradiance from the maximum power current, and to calculate the bifacial gain using a power scaling relation. The proposed method was experimentally tested using an outdoor platform with a dual-axis tracking system with bifacial modules. The effective irradiance calculated using the novel method presented nRMSE of 2.88 %, relative to the results obtained using the consolidated method. The bifacial gains obtained were 6.24 % and 6.69 %, respectively, using the proposed and traditional calculation methods. The procedure presented in this study might be useful for the quantification of the effective irradiance and the bifacial gain for PV installations which do not have extensive monitoring hardware.

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Section: ) Bifacial Gain Calculationmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Estimation of the Effective Irradiance and Bifacial Gain for PV Arrays Using the Maximum Power Current

Abe

Dias

Notton

et al. 2023

IEEE J. Photovoltaics

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show abstract

“…Equation ( 7) is a linear relation of the instantaneous I mp value with 𝐼 mp,F,STC , which refers to the front surface of the bifacial module for STC condition. In a similar way, the front irradiance G F is expressed by (8), where 𝐼 mp,F is the portion of I mp referring to the front-side contribution.…”

Section: ) Calculating G E From the I Mpmentioning

confidence: 99%

Estimation of the effective irradiance and bifacial gain for PV arrays using the maximum power current

Abe¹,

Dias²,

Notton³

et al. 2023

Preprint

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Manuscript Version 3 - accepted by the IEEE Journal of Photovoltaics. The final version is available at 10.1109/JPHOTOV.2023.3242117 Abstract: Bifacial photovoltaic modules are able to convert the solar radiation reaching their front and rear-sides, which means that more electricity can be produced using the same array area as monofacial modules with similar ratings. In some locations, the cost per power unit for such a technology has already become cost-competitive with conventional monofacial modules. The so-called effective irradiance and the bifacial gain are useful metrics, respectively, to assess the solar resource and the performance of bifacial arrays. To calculate the effective irradiance, studies previously published employ rear-side irradiance measurements, whereas to compute the bifacial gain, other works make use of monofacial modules with rating similar to those of the bifacial modules under analysis. In this paper, a straightforward method is presented, allowing to calculate the effective irradiance from the maximum power current, and to calculate the bifacial gain using a power scaling relation. The proposed method was experimentally tested using an outdoor platform with a dual-axis tracking system with bifacial modules. The effective irradiance calculated using the novel method presented nRMSE of 2.88 %, relative to the results obtained using the consolidated method. The bifacial gains obtained were 6.24 % and 6.69 %, respectively, using the proposed and traditional calculation methods. The procedure presented in this study might be useful for the quantification of the effective irradiance and the bifacial gain for PV installations which do not have extensive monitoring hardware.

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“…Entre las principales desventajas de la energía solar, destaca la baja eficiencia de los paneles solares y la intermitencia de la generación de electricidad debido a los efectos estocásticos de la fuente. En este sentido, los paneles fotovoltaicos bifaciales pueden ser una opción para aumentar la eficiencia de los proyectos solares y, de esta manera, reducir el uso de áreas destinadas para la instalación de los paneles [4], [5]. Cabe destacar que los paneles bifaciales son capaces de recibir y aprovechar la irradiación solar por ambas caras del panel, aumentado su capacidad de generar energía eléctrica.…”

Section: Introductionunclassified

Evaluación de superficies reflectantes para paneles solares bifaciales mediante la metodología de superficie respuesta

Castaño-Serna

Rubio-Clemente²,

Chica³

2022

Ing.

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Contexto: Los paneles solares fotovoltaicos bifaciales pueden generar más energía que los monofaciales, ya que, en el primer caso, ambos lados del panel quedan a disposición para captar la irradiancia solar y transformarla en energía eléctrica. La potencia adicional que se puede generar en los paneles bifaciales depende, entre otros factores, de la naturaleza y el tipo de la superficie reflectiva, así como de la orientación del módulo fotovoltaico. Método: En este trabajo se evalúan diversas superficies reflectantes para determinar la configuración óptima de un panel bifacial. Para este propósito, y con base en la metodología de superficie de respuesta, las curvas características del panel fotovoltaico (corriente-voltaje) para diversas elevaciones con respecto a cuatro superficies reflectantes son trazadas experimentalmente. Resultados: Los resultados del estudio revelan que, al instalar un panel bifacial sobre superficies reflectantes de espejo a una elevación del 98,66 % del ancho del panel, se logra alcanzar un aumento del 6,6 % de la generación de energía eléctrica en comparación con los módulos fotovoltaicos monofaciales. Conclusiones: Con la metodología aplicada, se identificó que la superficie de espejo es la mejor de las cuatro superficies evaluadas para el aprovechamiento de la irradiación reflejada, seguida por el concreto, el agua y la tierra.

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Energy yield measurement of an elevated PV system on a white flat roof and a performance comparison of monofacial and bifacial modules

Cited by 60 publications

References 14 publications

Estimation of the Effective Irradiance and Bifacial Gain for PV Arrays Using the Maximum Power Current

Estimation of the Effective Irradiance and Bifacial Gain for PV Arrays Using the Maximum Power Current

Estimation of the effective irradiance and bifacial gain for PV arrays using the maximum power current

Evaluación de superficies reflectantes para paneles solares bifaciales mediante la metodología de superficie respuesta

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