Naslov
Design of a Wind Turbine Pitch Controller for Loads and Fatigue Reduction

Autori
Jelavić, Mate ; Perić, Nedjeljko ; Petrović, Ivan ; Car, Stjepan ; Mađerčić, Miroslav

Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni

Izvornik
Proceedings of the European Wind Energy Conference & Exhibition, EWEC 2007 / - Milano, 2007

Skup
European Wind Energy Conference & Exhibition, EWEC 2007

Mjesto i datum
Milano, Italija, 07.05.2007. - 10.05.2007

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
Wind turbine; pitch control; loads; fatigue; tower oscillations

Sažetak
Wind turbines are constantly growing in size and power output level. This growth results in significant increase of structural loads and fatigue that have become limiting factors in wind turbine design. It introduces a need to control and limit structural loads and fatigue during wind turbine operation. This can be done by careful control system design. In this paper we focus on variable speed pitch controlled wind turbine that is today an industrial standard. A design procedure for three types of pitch controller is described and their performance is tested by simulations. Like first classic PID controller is described that aims only at achieving satisfactory rotor speed control. This classic pitch controller is then augmented and reduction of tower oscillations is used as additional demand during controller design. Two controller concepts used for this purpose are compared – SISO and full state feedback controller. Both controllers are designed by pole placement method that assures closed loop system to behave in desired manner. Desired closed loop system behavior is carefully chosen in such a way that controlled system behaves as if its structural damping has increased. It results in reduced tower motion what leads to loads and fatigue reduction. All controllers described in this paper are linear so an adaptation algorithm is needed to account for nonlinear nature of wind turbine. For this purpose we propose the use of Takagi-Sugeno fuzzy model that calculates process model output as a combination of "local" linear models identified in chosen operating points.

Izvorni jezik
Engleski

Znanstvena područja
Elektrotehnika, Temeljne tehničke znanosti

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