Projeto e montagem de um traçador de curva I-V fotovoltaico com carga capacitiva

Abstract

This paper describes the implementation of an I-V curves tracer for photovoltaic (PV) generators. The mechanism used to acquire the I-V electrical values is based on the capacitive load polarization technique using MOSFETs as switching devices. A Raspberry Pi Pico board is used to control and acquire the I-V pairs. The prototype was designed to test PV arrays with an open-circuit voltage to 80V and a short-circuit current to 5A. The current is measured using a Hall effect sensor and the voltage is measured using a resistive voltage divider. The voltage and current samples are transmitted via serial port to a computer in CSV format. The prototype was tested using 75 Wp monocrystalline photovoltaic modules. The results show that the components used have the potential to implement I-V curves tracers that are reliable and low-cost.