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

Tarek N. Dief*, Uwe Fechner, Roland Schmehl, Shigeo Yoshida, Amr M.M. Ismaiel, Amr M. Halawa

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

12 Citations (Scopus)
35 Downloads (Pure)


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

Original languageEnglish
Pages (from-to)275-291
Number of pages17
JournalWind Energy Science
Issue number1
Publication statusPublished - 17 Jan 2018


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