Estratégia de rastreamento de máxima potência para sistemas fotovoltaicos com a diminuição do número de sensores

Abstract

This undergraduate thesis presents a study and simulation of a photovoltaic system which the maximum power point tracking (MPPT) is traced from a sliding mode observer, in order to reduce the number of sensors used in the system. Initially, a bibliographic review is fulfilled, in which the photovoltaic cells and panels, converters and inverters usually used and MPPT stra-tegies were studied. Based on this study, the 3TSolar - 260Wp is defined as the panel to be used, the Boost voltage converter, the MPPT perturbation and observation (P&O) strategy, and, especially, the sliding mode observer that will be the focus of this work. All parameter settings are performed on the panel, the values of all the inverter elements are calculated, the P&O strategy algorithm is elaborated, a state-space model analysis is performed to validate the sys-tem and, with that, the observer was developed by sliding mode, that considers the error between the measured and observed values. Then, the results are presented, which are divided into three parts: (i) topology of the converter and state-space model; (ii) topology of the con-verter with observer by sliding modes; and, for last, (iii) the complete topology simulation, which is, the converter with the sliding mode observer, including MPPT P&O strategy. Finally, it can be concluded that the observer performs as intended.