Simulação de conversor buck-boost com RPMP por P&O aplicado a módulos fotovoltaicos

Abstract

The low efficiency rate of photovoltaic modules and the search for its best use still is a reason for searches. Factors that influence the efficiency of a photovoltaic system can have external origins, like irradiation e temperature, and internal, like a utilization of maximum power point (MPP) tracking algorithm associated with power converters. Those algorithms feature techniques that change the voltage and current level, acting directly on the power extracted from the system. Among the principal techniques are the constant voltage method, perturb and observe (P&O) and incremental conductance. The objective of this work, therefore, is to perform a study and simulation of a CC-CC buck-boost converter using the P&O method applied for PMP tracking. The calculations for the determining the parameters of the converter and its physical panel modeling of the panel were presented, using a simulation software. The simulation performed showed satisfactory results, from which the module's current, voltage and power waveforms were obtained, in which, the results achieved from the comparative analysis of the values reached in the waveforms indicated simulation errors of 2.91%, 8% and 2.55% for the MPPT current, MPPT voltage and converter power, respectively.