Analysis of irradiance models for bifacial PV modules

Hansen, Clifford W.; Stein, Joshua S.; Deline, Chris; MacAlpine, Sara; Marion, Bill; Asgharzadeh, Amir; Toor, Fatima

doi:10.1109/pvsc.2016.7749564

Cited by 38 publications

(22 citation statements)

References 5 publications

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“…Equation 2 (2) Fig. 8 shows the results of modeling a bifacial PV system temperature with (2). Residual plots of the errors for a colocated monofacial system exhibit nearly identical features and residual magnitudes.…”

Section: Cell and Module Temperaturementioning

confidence: 98%

“…However, additional factors such as the module's position within a row, the row's height above ground, the proximity of the row to other rows or structures, the transparency of the module [1], and the shadow pattern on the ground alter the amount of irradiance available to the rear side of a bifacial PV module. Several efforts are underway to develop and validate rear-side irradiance models [2]. Sandia is developing a view factor model for irradiance on each cell that accounts for 3D geometry [3]; NREL [4] and SunPower [5] are proposing array-scale models with 2D geometry for fixed and single axis tracking systems, respectively; and Univ.…”

Section: A Front and Rear Irradiancementioning

confidence: 99%

“…In monofacial PV systems, the level of current mismatch between modules must be quite high in order to have a significant effect on the power of the string. While the same underlying principles hold for bifacial modules, the possible variation in irradiance among cells is affected by variation of rear-side irradiance across the cells, which can be substantial [2].…”

Section: E Cell and Module Mismatchmentioning

confidence: 99%

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A Performance Model for Bifacial PV Modules

Riley

Hansen

Stein

et al. 2017

2017 IEEE 44th Photovoltaic Specialist Conference (PVSC)

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Sandia National Laboratories, the National Renewable Energy Laboratory, and the University of Iowa are collaborating to develop a performance model for bifacial PV modules. As with monofacial PV modules, a bifacial PV model consists of sequential operation of the component sub-models. Bifacial PV modules accept light on both their front and rear surfaces which presents a unique modeling challenge. This paper describes the approach of Sandia, NREL, and the University of Iowa to create a bifacial PV model and verify its accuracy with measured field data.

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Section: Cell and Module Temperaturementioning

confidence: 98%

Section: A Front and Rear Irradiancementioning

confidence: 99%

Section: E Cell and Module Mismatchmentioning

confidence: 99%

See 1 more Smart Citation

A Performance Model for Bifacial PV Modules

Riley

Hansen

Stein

et al. 2017

2017 IEEE 44th Photovoltaic Specialist Conference (PVSC)

Self Cite

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“…Instead, if a bifacial PV module must be implemented, it is needed to consider the front solar radiation and the back one [21]. The authors assumed that the total rear irradiance (I Rear ) entering the back of the bifacial solar module is the sum of the direct irradiance (I Rear,dir ) and diffuse irradiance (I Rear,diff ) [22,23]. At the rear, it is divided into the amount of irradiance reflected directly from the ground and the amount reflected from the surroundings.…”

Section: Model Of the Rear Solar Radiationmentioning

confidence: 99%

Simulink model of a bifacial PV module based on the manufacturer datasheet

Vergura¹

2020

REPQJ

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The paper proposes an update of a mathematical model of a Photo-Voltaic (PV) module, considering the possibility that also the rear face of the PV module produces energy. The proposed approach allows to write a new descriptive equation, whose terms are function of the information always available in the modern datasheet of the PV module's manufacturers. This implies that no pre-processing of the datasheet's parameters is needed to use the proposed model, whichever are the solar irradiance and the cell/module temperature. The model considers the total solar radiation (front and back side), such that the produced energy increases. Simulink environment is used to calculate the total solar radiation.

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“…Currently, the most important optical models used to quantify the irradiance on the backside of a bifacial solar panel are view factor (VF) and ray tracing (RT). A comparison of simulated and measured irradiance has been carried out using 2D VF with an unlimited shed approach as well as RT in Hansen et al, where two reference solar cells were used on the top and bottom at the backside of bifacial PV modules, and the measurement was done during one day, with an accuracy of 5% being reported. Chiodetti also used single calibrated pyranometers to measure the backside irradiance on an extended stand of PV modules and compare it to that of modeled values found by 2D VF, and a deviation of 3% to 5% has been achieved during 1 week of measurement.…”

Section: Introductionmentioning

confidence: 99%

A comparison of ray tracing and view factor simulations of locally resolved rear irradiance with the experimental values

Berrian

Libal

2020

Progress in Photovoltaics

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One of the prerequisites for a reliable energy yield prediction of bifacial photovoltaic (PV) systems is the capability of modeling the backside irradiance of those systems with high accuracy. Currently, the most important optical models used to quantify the reflected irradiance on the backside of a bifacial solar panel are view factor and ray tracing. The MoBiDiG simulation tool has been developed at ISC Konstanz uses the view factor (VF) concept to model the rear irradiance. In addition to the VF concept, ray tracing (RT) has been adopted to determine the backside irradiance of bifacial modules by using the open-source tool bifacial_radiance that has been developed by the National Renewable Energy Laboratory (NREL). A customized monocrystalline silicon solar panel has been built in order to evaluate the accuracy of the existing optical models by locally resolved rear irradiance measurement. The performance of rear irradiance has been investigated along the rows of the customized PV module during sunny and cloudy days with typical back irradiance values of ≈50 and ≈ 150 W∕m 2 . The comparison of measured and modeled data has been carried out on hourly, daily, and monthly basis, and the results show lower deviations for solar cells located in the center of the PV module than on the edge. Moreover, the concept of decisive solar cells has been introduced and applied to both measured and modeled data, solar cells located in the center rows were found to act as the most decisive solar cells. Finally, considering the installation configuration studied here, ie, bifacial mounting with low clearance height (below 0.2 m), both hourly RT and VF approaches are able to model long-term cumulative irradiance received by decisive solar cells with a very high accuracy ranging from ±0.5% to ±2%.

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Analysis of irradiance models for bifacial PV modules

Cited by 38 publications

References 5 publications

A Performance Model for Bifacial PV Modules

A Performance Model for Bifacial PV Modules

Simulink model of a bifacial PV module based on the manufacturer datasheet

A comparison of ray tracing and view factor simulations of locally resolved rear irradiance with the experimental values

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