Iterative model-based Maximum Power Point Tracker for photovoltaic panels

Maximum Power Point Tracking (MPPT) techniques are used to maintain the photovoltaic (PV) panel operating point near its maximum power point (MPP). In general, the location of the MPP on the V-I plane is not known, but it can be reached, either through a-priori knowledge or by search algorithms. Lots of tracking algorithms have been presented in literature, and in the last years the focus has been moved on improving the performance during rapid changes without sacrificing the efficiency in steady state conditions. Model-based (MB) MPPT techniques guarantees excellent dynamic performance, since they locate MPP directly from a model of the PV panel in the present operating conditions, which are represented by solar radiation and temperature. In a recent paper the authors have presented a new approach to MPPT for PV panels which do not require a direct measurement of the solar radiation. In this work it will be shown how a simpler model can be employed to track MPP using an iterative technique. This method has been validated through experimentation.