95/03783 The role of the Little Bay solar energy research facility in prompting the development and use of photovoltaic systems

1995 ◽  
Vol 36 (4) ◽  
pp. 272
Keyword(s):  
Solar Energy ◽  
Photovoltaic Systems ◽  
Research Facility ◽  
Energy Research

Heliostat Attitude Control Strategy in the Solar Energy Research Facility of Valparaiso University

2019 ◽  
Vol 141 (5) ◽  
Author(s):  
Shahin S. Nudehi ◽  
G. Scott Duncan ◽  
Luke J. Venstrom
Keyword(s):  
Solar Energy ◽  
Control Strategy ◽  
Attitude Control ◽  
Tracking Error ◽  
Feedback Gain ◽  
Research Facility ◽  
Energy Research ◽  
Nonlinear Dynamic Model ◽  
Concentrated Solar Energy ◽  
Tracking Strategy

In this paper, a continuous tracking strategy for the heliostat in the James S. Markiewicz Concentrated Solar Energy Research Facility at Valparaiso University is developed. A model of the nonlinear dynamics of the heliostat motion is developed and the open-loop control strategy is presented. Asymptotic stability of the heliostat control using the Lyapunov and LaSalle’s theorems was proven. Simulations using the nonlinear dynamic model are presented and interpreted to identify the feedback gain that maximizes the time response of the heliostat without introducing oscillations in its motion. Finally, the control strategy is put to the test during summertime operation. The data presented show that the tracking strategy has an root mean square (RMS) tracking error of 0.058 mrad, where the error is defined as the difference between the desired and actual heliostat positions. Images of the aperture of a high-temperature solar receiver over 8 h of testing are also presented to qualitatively demonstrate the success of the tracking strategy.

scholarly journals Fault Diagnostic Methodology for Grid-Connected Photovoltaic Systems

2021 ◽  
Vol 2 (2) ◽  
pp. 10-30
Author(s):  
Proenza Y. Roger ◽  
Camejo C. José Emilio ◽  
Ramos H. Rubén
Keyword(s):  
Mathematical Model ◽  
Fault Diagnosis ◽  
Solar Energy ◽  
False Alarm ◽  
False Alarm Rate ◽  
Real System ◽  
Photovoltaic Systems ◽  
Energy Research ◽  
Santiago De Cuba ◽  
The Mathematical Model

This research focuses on the design of a fault diagnosis methodology to contribute to the improvement of efficiency, maintainability and availability indicators of Grid-Connected Photovoltaic Systems. To achieve this, we start from the study of the mathematical model of the photovoltaic generator, then, a procedure is performed to quantify the operational losses of the photovoltaic generator and adjust the mathematical model of this to the real conditions of the system, through a polynomial adjustment. A real system of nominal power 7.5 kWp installed in the Solar Energy Research Center of the province of Santiago de Cuba is used to evaluate the proposed methodology. Based on the results obtained, the proposed approach is validated to demonstrate that it successfully supervises the system. The methodology was able to detect and identify 100% of the simulated failures and the tests carried out had a maximum false alarm rate of 0.22%, evidencing its capacity.

Role of Solar Energy Research in Transferring of Technology to Saudi Arabia

1999 ◽  
Vol 21 (10) ◽  
pp. 923-934 ◽  
Author(s):  
Saleh Hussein Alawaji, Syed Mahmood
Keyword(s):  
Saudi Arabia ◽  
Solar Energy ◽  
Energy Research

scholarly journals The Resilience of the electric sector after COVID-19 and the impacts on the photovoltaic solar energy market

2021 ◽  
Vol 10 (2) ◽  
pp. 46
Author(s):  
Vânia Reis De Souza-Sant’Anna ◽  
Adriano Henrique Ferrarez ◽  
Maria Joselma De Moraes ◽  
Juan Carlos Solano-Jiménez
Keyword(s):  
Power Generation ◽  
Solar Energy ◽  
Electric Power ◽  
Electricity Consumption ◽  
Energy Market ◽  
Photovoltaic Systems ◽  
Solar Photovoltaic ◽  
Electric Power Generation ◽  
Electric Sector

INTRODUCTION. The Brazilian electricity sector and parts of society are experiencing the impacts of COVID-19, which spreads throughout the world, paralyzing all or part of its activities. The reduction in electricity consumption leads to an analysis of the stability of the Brazilian energy matrix that serves different social segments. OBJECTIVE. The objective of this work was to carry out an analysis of the electric power generation sector and its standardization, the perspectives of its post-Covid-19 behaviour and the role of renewable energy sources, in particular the photovoltaic industry. METHOD. An analysis was made of the electric power generation sector and its standardization, the prospects for its post-Covid-19 behaviour and the role of the solar photovoltaic systems. RESULTS. Scenarios evaluated: updating of the regulatory framework for the Brazilian electric sector, the solar energy market photovoltaic, electricity consumption and the solar photovoltaic systems as a complementary source in this climate change scenario. DISCUSSION AND CONCLUSIONS. It is concluded that sustainable transitions on the planet, associated with economic growth, promote human development for a low carbon community.

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