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ECN publication
Exploring the Limits in Individual Pitch Control
Published by: Publication date:
ECN Wind Energy 27-4-2009
ECN report number: Document type:
ECN-M--09-053 Conference Paper
Number of pages: Full text:
12 Download PDF  

Presented at: European Wind Energy Conference 2009, Marseille, France, 16-19 maart 2009.

Individual pitch control (IPC) is an advanced wind turbine control method for fatigue load reduction. The conventional IPC algorithm (cyclic pitch control) aims at achieving 1p blade load reduction by mitigating the static rotor tilt and yaw moments. Besides these existing IPC methods, this paper presents a novel application of IPC: rotor balancing. Imperfections in the blades lead to aerodynamic and/or mass unbalance that result in variations at the rotational frequency 1p in the rotor tilt and yaw moments. The new IPC algorithm compensates for such rotor unbalance by adding quasi-steady offsets to the blade pitch angles. As a second contribution, an “anti-windup” IPC implementation is proposed for dealing with blade actuator limitations. Detailed nonlinear simulations are used to validate the proposed IPC algorithms.

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