This paper deals with the mathematical model to assess the performances of photovoltaic (PV) cells. The PV system characteristics are modeled and analyzed by using the curve fitting method referred to the different connections of PV cells and different solar irradiance. The results are compared with those resulting from measured data in a real case. Specific LabVIEW TM and Matlab TM software applications are implemented to prove the theoretical methods.
The renewable energy sources are becoming more and more current in the energy supply of buildings, from residential buildings to institutional buildings. The renewable energy sources have proved to be a solution and an important element of the Romanian Energy System. We are starting from the idea of using the renewable sources to passivize a building, and we are relying on existing facilities in the Multidisciplinary Scientific and Technological Research Institute (ICSTM) from Valahia University of Targoviste (UVT) to produce the energy from its own sources. We are also considering the consumption data from previous year as well as the electric link to external power grid. This paper aims to propose new renewable energy units so that ICSTM become energetical independent. Currently, the ICSTM building consumes an amount of energy produced from renewable sources about three times less than that consumed from the external network. In order to determine the number of equipment, specifically CPV (concentrating photovoltaic) panels placed on trackers, it is desirable to create a 40% reserve above the installed power, taking in account the possible future development of the research laboratories.
Photovoltaic (PV) systems have been successfully used for over five decades. The output characteristics of PV cell depend on the environmental conditions. For any solar cell, the model parameters are function of the temperature and the irradiance values of the site where the panel is placed. In this paper the performances of PV cells are analysed related to the different irradiance level by using the circuit sensitivity. Therefore the model parameters of the equivalent circuits for typical PV cell are characterized by first-order sensitivity relations. LabVIEW and MatLab applications are implemented to prove the theoretical models. Numerical examples taken from real case on PV cells are provided.
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