Digital simulation of a predictive current control for photovoltaic system based on the MPPT strategy

摘要

This paper presents a maximum power point tracking (MPPT) strategy, which consists on two main stages. On the first part, a variable-step MPPT control is used to obtain the optimal current slope to extract the maximum power of a photovoltaic array. The reference calculated by the MPPT stage will be used for the second stage, which improve the MPPT control by using a predictive current control for the dc/dc boost converter. MPPT with variable step-size is used in order to overcome the problems presented on different MPPT algorithms. After that, to get an optimal duty cycle, a predictive current control based on predicted mean value strategy is used, which consists on calculate the optimal “on” time of the power transistor to the next scheme control cycle. The proposed algorithm is verified using MATLAB SIMULINK.