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. In wind energyresearch, airborne wind energy systems are one of the promisingenergy sources in the near future. They can extractmore energy from high altitude wind currents compared to conventional wind turbines. This can be achieved with the aid of aerodynamiclift generated by a wing tethered to the ground. Significant savings in investment costs and overall system mass would be obtainedsince no tower is required. To solve the problems of wind speed uncertainty and kite deflections throughout the flight, systemidentification is required. Consequently, the kite governing equations can be accurately described. In this work, a simple model waspresented for a tether with a fixed length and compared to another model for parameter estimation. In addition, for the purpose ofstabilizing the system, fuzzy control was also applied. The design of the controller was based on the concept of Mamdani. Due to itsrobustness, fuzzy control can cover a wider range of different wind conditions compared to the classical controller. Finally, systemidentification was compared to the simple model at various wind speeds, which helps to tune the fuzzy controlparameters.

System identification, fuzzy control and simulation of a kite power system with fixed tether length