Dynamic modeling and control design for a photovoltaic system for MPPT

Photovoltaic panels have become an important option for supplying electric energy demand, as they transform the energy coming from the sun into electric energy. One of the main goals of this kind of systems is to extract the maximum power from the panel. In this paper it is proposed to use the P&O algorithm working together with a PID controller; the latter is used to find the Maximum Power Point (MPP) and the former's aim is, besides a good tracking of the reference signal generated by P&O algorithm, the rejection of disturbances coming from changes in the environment. As a tool for system analysis and controller design, it is proposed state space modeling for this problem. By means of simulation, the performance of the solution is illustrated the control system enables the operation, at every moment, at the maximum power point, showing robustness to changes in irradiance and variations of battery voltage.