Gain Scheduling Pitch Control for Fatigue Load Reduction for Wind Turbines
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Beschreibung
This work investigates several methods for the design of a pitch control system, which actively reduces the fatigue loads on the tower of a wind turbine. As major contribution, this work demonstrates that it is possible to design collective pitch controllers that, additionally to basic rotor speed control and active damping of the first fore-aft tower bending mode, allow to reduce the fore-aft tower bending loads due to 3p harmonic excitation.
Three different control design methods have been investigated, and will be discussed regarding their advantages and disadvantages: (1) Classical linear PID (Proportional Integral Derivative) control design; (2) Linear H8 control design based on LMI (Linear Matrix Inequalities) criteria; (3) Nonlinear LPV (Linear Parameter Variant) control design based on convex optimization. Controller input signals in all cases are rotor speed and axial tower top acceleration. Because of the nonlinear aerodynamics of a wind turbine, for each design some type of gain scheduling is required. The basic practical aspects, e.g. anti-windup and gain scheduling have been verified in non-linear simulations.
Autor*in
Wei Wei Shan
Themen in »Gain Scheduling Pitch Control for Fatigue Load Reduction for Wind Turbines«
Fraunhofer IWES automatic control engineering mechanical engineering & materials erneuerbare Energien Windenergie Regelungstechnik Strukturdynamik Materialermüdung ingenieure Regelungstechnik ingenieure Windenergie Ingenieure Regelungstechnik Ingenieure Windenergie