This article describes a mathematical model implemented in Matlab/Simulink to evaluate the performance of building integrated photovoltaic systems (BIPVS). The proposed methodology allows to model independently the solar panel, the photovoltaic (pv) generator, inverter and the grid to integrate them into a single model in Simulink in order to evaluate the performance of the complete system. The validation of the model was made on a BIPV system of 6 kWp installed in a building at the Universidad de Bogotá Jorge Tadeo Lozano in Bogota, Colombia. The results indicate that there is a correlation greater than 0.9 between DC and AC power generated by the BIPV system and calculated by the model proposed for any weather condition.
Keyword:Matlab software Photovoltaic systems PV performance model Radiation and temperature Solar energy
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Corresponding Author:Andrés Julián Aristizábal Cardona, Engineering Department, Universidad de Bogotá Jorge Tadeo Lozano, Carrera 4 #22-61, Bogotá, Colombia. Email: andresj.aristizabalc@utadeo.edu.co
INTRODUCTIONBesides being a renewable and pollution free energy generation technology with no moving parts, PV modules can also be integrated into buildings as BIPV systems, adding aesthetic value [1]. When installed in an optimized way, BIPV systems can reduce heat transferred through the envelope and reduce cooling load components decreasing the CO2 emissions [2]. Apart from some facade installations, the rooftop segment represented more than 23 GWp of total installations in 2015, with projections of more than 35 GWp to be installed by 2018 [3].Since the BIPV offers the possibility to replace part of the traditional building material, with a possible price reduction in comparison to a classic rooftop installation [4], [5], the correct estimation of system level performances, system reliability and system availability is becoming more important and popular among installers, integrators, investors and owners; with this purpose several tools and models were developed [6][7][8]. The combination of different phenomena, such as the solar radiation available on site, the presence of dust, the shadowing or UV radiation over long outdoor exposure, affect in different ways the performance of BIPV systems and thus the related economic evaluations [9][10][11].Many studies have been devoted to develop different non-linear electric models used to describe the characteristics of the PV modules and the effect on module performance of temperature, radiation intensity and other parameters and equipment/systems under non-standard conditions [12][13][14][15][16][17][18][19][20]. We offer a new method to model and analyze the performance of BIPV systems using Matlab/Simulink.In Section 2 of this article the mathematical description of the proposed model is presented to evaluate the performance of BIPV systems. Subsequently, Section 3 describes the 6 kW BIPV system installed. Section 4 presents the results obtained and the validati...