Design of photovoltaic-based current sources for maximum power transfer by means of power gyrators

摘要

The use of power gyrators as DC impedance matching circuits in photovoltaic (PV) systems is investigated. With the aim of maximum power transfer from a PV panel to a DC load, a G-gyrator is designed as a matching power interface with a timevarying adaptive conductance that guarantees the operation at the maximum power point. The adaptive nature of the gyrator conductance is given by an extremum-seeking control algorithm, which eventually results in a stable oscillation around the maximum power point regardless of the system initial conditions and atmospheric changes. A direct application of this research is the implementation of a high efficient source splitting configuration for maximum power transfer from N independent solar panels to a DC load.