Análise das técnicas de rastreamento do ponto de máxima potência em sistemas fotovoltaicos utilizando um conversor CC/CC elevador

Abstract

Nowadays, the offer on traditional power energy sources has not became enough to supply the increasing demand. Therefore, it researches alternatives, and they need to be renewable and cheap, as well as the promisor solar systems, which applications it is increasing exponentially around the world, mainly by the photovoltaic conversion. About it, and if it is considered the photovoltaics’ low efficiency, this paper considers the maximum power point tracking algorithms applied on photovoltaic systems. More specifically, it will be stressed the control mechanisms under the voltage step up converter. Moreover, they will be presented the experimental methods, like devices’ specifications, and the maximum power point tracking algorithms based on perturbe and observe, which explore the solutions’ set locally, by perburbation under an input variable. Initially, this input variable will be considered the voltage and, in a second test, the duty cycle, which is the proportion between the cycle of converter’s turn on and total periods. Next, it will be presented the incremental conductance, an algorithm based on variable step, which is evaluated if it is considered the derivative ratio between power and voltage. At last, it will be presented results about power and enrgy conversion, as well the generation oscillations of photovoltaics, like a result of environment state and particularities of the algorithms embeeded on converter’s control unit. After all experiments, it is posible observe some of proper characteristics about input voltage and duty cycle P&O MPPT algorithms, as well Incremental Conductance, and their influence under the photovoltaic conversion’s performance.