Power maximization of a closed-orbit kite generator system

This paper presents a control scheme of a closed-orbit kite generator system (KGS). Such a system is divided into two main parts: A kite with its orientation mechanism and a power transformation system. Starting from a given closed orbit, the optimal tether´s length rate variation (tether radial velocity) and the optimal orbit´s period are found. For the kite´s orientation, a kite model is chosen and a trajectory-tracking control is developed. The power transformation system controls the tether radial velocity and transforms the mechanical energy generated by the kite into electrical energy that can be added to the grid. The proposed control strategy is tested on a Matlab/Simulink model of the KGS.