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|Development and validation of coupled thermal-electric transient model of a photovoltaic system
|Pereira, S., Canhoto, P., Salgado, R., Oozeki, T. (2023). Development and validation of coupled thermal-electric transient model of a photovoltaic system. 40th European Photovoltaic Solar Energy Conference & Exhibition, EUPVSEC2023, 3AV.3.17, Sep. 18-22, 2023, Lisbon, Portugal.
|Installed capacity of renewable energy systems keeps growing worldwide in response
to climate and socio-economic changes. Among these, photovoltaic power can increase the
solar energy contribution in the global mix of energy sources in the near future. Crystalline
(mono or poly-crystalline) silicone is the material used in the most widespread photovoltaic
modules. Their efficiency depends on several factors and thus modeling the conversion of
solar radiation into electricity is crucial and can have various applications, from the study of
the different parameters that affect this conversion to the design, maintenance and power
output forecasting of photovoltaic systems. To that end, various models have been proposed
in the literature, many resorting to empirical data and based on specific modules/systems.
In this work, a coupled thermal-electric model was developed for crystalline silicon
modules and validated with experimental data from four photovoltaic technologies. The
model was developed to be used without resorting to system measurements but only using
data provided by the manufacturers. To avoid biases towards a specific technology or
location empirical data is not used in its development. The thermal model is based on the
energy conservation principle and the heat transfer processes that occur in illuminated
photovoltaic modules. The electrical model used is the single diode - five parameters
equivalent electrical circuit. The proposed model is transient thus providing the temporal
variation of the temperature of the module and electric power output simultaneously at an
imposed time step, which is an advantage for modeling at high temporal resolutions with
applications in inverter operation and electric grid stability. Moreover, the model outputs
can be easily averaged or integrated in order to obtain mean values of system operation.
The validation of the model was done with 10 minute data of global tilted irradiance,
air temperature, wind speed and direction, temperature of the modules, power output of
arrays of four different crystaline silicone technologies with peak power ranging from 1904.8
to 2000 W located in Koriyama, Japan (37.4495; 140.3144). The data used resulted in 24543
data points for each photovoltaic system without shadowing of the photovoltaic cells caused
by other rows or snow deposition. The results show a slight overestimation of photovoltaic
temperature (up to 2.52°C in mean bias error) and power output (up to 6.44% in relative
mean bias error) for all systems. Although in terms of generated power, when comparing the
developed model with the single diode - five parameters equivalent electric circuit model
but using the measured temperature of the modules, the proposed model showed better
estimations for all systems but one.
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|ICT - Comunicações - Em Congressos Científicos Internacionais
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