DEVELOPMENT OF AN ELECTRONIC DEVICE FOR THE PHOTOVOLTAIC PAINEL CHARACTERIZATION

Resumo

The main objective of this study is to trace experimentally the characteristic curve of a photovoltaic (PV) panel. And for that, it is necessary to connect a variable resistor with the PV panel. In this case, it was used a circuit of electronic load to behave like a variable resistor, and as a consequence, this circuit has greater accuracy; and for that reason, it was developed a prototype to trace this curve. The prototype has three stages (signal generator, amplification stage and transistor stage) connect with a PV panel. was And for the first version of the prototype, witch part was designed to the PV panel KC40T. Also, it needed to build a power supply source to feed the amplification stage. Beyond that, with the right sizing of the parameters it is possible to trace the current-voltage curve of PV panel, since the open circuit voltage to the short circuit current. The prototype was built on a printed circuit board, and it contain two parts, one with the power supply and other with the main circuit. The circuit of electronic load was simulated to an irradiance of 1000W/m² and compared with the curve provide by the manufacturer. Then prototype was built in a printed circuit board and the results to an irradiance of 1050 and 850W/m² were compared with the simulation results. The simulated curve and the curve of the circuit of the electronic load were very clothe with each other, validating the prototype, however, it can be a way to minimize the error between the curves.