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Your search keyword '"Yasser, Zeyad"' showing total 17 results
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17 results on '"Yasser, Zeyad"'

3. Evaluating the Potential Benefit of Using Nowcasting Systems to Improve the Yield of Parabolic Trough Power Plants with Single-Phase HTF

Author

Noureldin, Kareem, Hirsch, Tobias, Nouri, Bijan, Yasser, Zeyad, and Pitz-Paal, Robert

Subjects
field control, lcsh:T, Solare Hochtemperatur-Technologien, nowcasting, transient simulation, lcsh:Technology, DNI maps
Abstract

Solar field developers include innovative solutions to optimize the energy production of their plants. Simulation tools play a significant role in the design and testing phases as they provide estimations of this yield in different conditions. Transient processes, like passing clouds and solar field start-up, are specifically challenging to optimize and estimate using such simulation tools. Solar fields are subject to high degree of both temporal and spatial variability in the energy input and a detailed estimation can be achieved by simulating subsystems within acceptable time and computational power. Hence, such simulation tools cannot be utilized for tests under realistic operation conditions. The Virtual Solar Field is a computationally efficient simulation tool that allows a detailed transient simulation of parabolic trough solar fields based on single-phase fluids. Using this tool, developers could reproduce a transient test case with exactly the same disturbances to provide fair comparisons between different configurations. In this paper, an evaluation process based on numerical simulations using the Virtual Solar Field is presented. The economic benefit of novel innovative control concepts can be assessed according to the presented scheme. This is demonstrated by evaluating the potential benefit of availability of spatial DNI nowcasts on the control of parabolic trough solar fields. Results show that nowcasting can increase the economic revenue of commercial power plants by up to 2.5% per day. This proves the feasibility of installing such systems.

Published
2021
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5. A way to increase parabolic trough plant yield by roughly 2% using all sky imager derived DNI maps

Author

Nouri, Bijan, primary, Noureldin, Kareem, additional, Schlichting, Tim, additional, Wilbert, Stefan, additional, Hirsch, Tobias, additional, Schroedter-Homscheidt, Marion, additional, Kuhn, Pascal, additional, Kazantzidis, Andreas, additional, Zarzalejo, Luis F., additional, Blanc, Philippe, additional, Yasser, Zeyad, additional, Fernández, Jesús, additional, and Pitz-Paal, Robert, additional

Published
2020
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6. Evaluation of an all sky imager based nowcasting system for distinct conditions and five sites

Author

Nouri, Bijan, primary, Wilbert, Stefan, additional, Blum, Niklas, additional, Kuhn, Pascal, additional, Schmidt, Thomas, additional, Yasser, Zeyad, additional, Zarzalejo, Luis F., additional, Lopes, Francisco M., additional, Silva, Hugo G., additional, Schroedter-Homscheidt, Marion, additional, Kazantzidis, Andreas, additional, Raeder, Christian, additional, Blanc, Philippe, additional, and Pitz-Paal, Robert, additional

Published
2020
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8. Vergleich und Bewertung solarer Nowcasting-Systeme

Author

Kuhn, Pascal Moritz, Nouri, Bijan, Wilbert, Stefan, Bianco, Laura, Vallance, Loic, Prahl, Christoph, Ramirez, Lourdes, Zarzalejo, L.F., Schmidt, Thomas, Yasser, Zeyad, Vuilleumier, Laurent, Heinemann, Detlev, Kazantzidis, A., Wilczak, J.M., Blanc, Philippe, and Pitz-Paal, Robert

Subjects
Pascal-berät-Gott-in-Fragen-der-Schöpfung, ramp metrics, benchmarking,  Nowcasting, all-sky imagers
Published
2018

10. Validation of an all-sky imager based nowcasting system for industrial PV plants

Author

Kuhn, Pascal Moritz, Nouri, Bijan, Wilbert, Stefan, Prahl, Christoph, Kozonek, Nora, Schmidt, Thomas, Yasser, Zeyad, Ramirez, Lourdes, Zarzalejo, L.F., Meyer, Andreas, Vuilleumier, L., Heinemann, Detlev, Blanc, Philippe, and Pitz-Paal, Robert

Subjects
Photovoltaics, Grid Integration, Qualifizierung, Solar Nowcasting
Published
2017

11. Cover Image, Volume 26, Issue 8

Author

Kuhn, Pascal, primary, Nouri, Bijan, additional, Wilbert, Stefan, additional, Prahl, Christoph, additional, Kozonek, Nora, additional, Schmidt, Thomas, additional, Yasser, Zeyad, additional, Ramirez, Lourdes, additional, Zarzalejo, Luis, additional, Meyer, Angela, additional, Vuilleumier, Laurent, additional, Heinemann, Detlev, additional, Blanc, Philippe, additional, and Pitz-Paal, Robert, additional

Published
2018
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15. Simulation of Potential Enhancements in Parabolic Trough Solar Field Start-up Controllers using Nowcasting Systems.

Author

Noureldin, Kareem, Hirsch, Tobias, Nouri, Bijan, and Yasser, Zeyad

Subjects
PARABOLIC troughs, SOLAR power plants, RADIATION
Abstract

The yield of solar thermal power plants is strongly affected by disturbances in the irradiation condition through passing clouds. This effect is even more prominent when the clouds shade the solar field only partially as the irradiance situation cannot be fully measured by few measurement points in the field. In this paper, the benefit of using nowcasting systems to produce highly resolved irradiance maps on the field during start-up is studied. A simulation tool is used to dynamically model all the loops and piping in a reference commercial solar field. Automatic solar field controllers allow the model to operate during different situations. The performance of the field under a reference state-of-the-art controller is compared against a controller using the irradiance maps from nowcasting systems. The benefit during start-up processes is found to be significantly lower than the benefit the system makes during normal solar field operation. However, there is more potential shown for more advanced controllers, like model-predictive control. [ABSTRACT FROM AUTHOR]

Published
2019
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16. Validation of an all‐sky imager–based nowcasting system for industrial PV plants

Author

Kuhn, Pascal, primary, Nouri, Bijan, additional, Wilbert, Stefan, additional, Prahl, Christoph, additional, Kozonek, Nora, additional, Schmidt, Thomas, additional, Yasser, Zeyad, additional, Ramirez, Lourdes, additional, Zarzalejo, Luis, additional, Meyer, Angela, additional, Vuilleumier, Laurent, additional, Heinemann, Detlev, additional, Blanc, Philippe, additional, and Pitz‐Paal, Robert, additional

Published
2017
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17. Validation of an all‐sky imager–based nowcasting system for industrial PV plants.

Author

Kuhn, Pascal, Nouri, Bijan, Wilbert, Stefan, Prahl, Christoph, Kozonek, Nora, Schmidt, Thomas, Yasser, Zeyad, Ramirez, Lourdes, Zarzalejo, Luis, Meyer, Angela, Vuilleumier, Laurent, Heinemann, Detlev, Blanc, Philippe, and Pitz‐Paal, Robert

Subjects
PHOTOVOLTAIC power generation, ELECTRICITY, NOWCASTING (Meteorology), ELECTRIC power distribution grids, PYRHELIOMETER
Abstract

Abstract: Because of the cloud‐induced variability of the solar resource, the growing contributions of photovoltaic plants to the overall power generation challenges the stability of electricity grids. To avoid blackouts, administrations started to define maximum negative ramp rates. Storages can be used to reduce the occurring ramps. Their required capacity, durability, and costs can be optimized by nowcasting systems. Nowcasting systems use the input of upward‐facing cameras to predict future irradiances. Previously, many nowcasting systems were developed and validated. However, these validations did not consider aggregation effects, which are present in industrial‐sized power plants. In this paper, we present the validation of nowcasted global horizontal irradiance (GHI) and direct normal irradiance maps derived from an example system consisting of 4 all‐sky cameras (“WobaS‐4cam”). The WobaS‐4cam system is operational at 2 solar energy research centers and at a commercial 50‐MW solar power plant. Besides its validation on 30 days, the working principle is briefly explained. The forecasting deviations are investigated with a focus on temporal and spatial aggregation effects. The validation found that spatial and temporal aggregations significantly improve forecast accuracies: Spatial aggregation reduces the relative root mean square error (GHI) from 30.9% (considering field sizes of 25 m2) to 23.5% (considering a field size of 4 km2) on a day with variable conditions for 1 minute averages and a lead time of 15 minutes. Over 30 days of validation, a relative root mean square error (GHI) of 20.4% for the next 15 minutes is observed at pixel basis (25 m2). Although the deviations of nowcasting systems strongly depend on the validation period and the specific weather conditions, the WobaS‐4cam system is considered to be at least state of the art. [ABSTRACT FROM AUTHOR]

Published
2018
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