Abstract
Reset controllers are commonly used to smooth the transient response of systems. We use this technique to improve a standard baseline pitch controller for offshore wind turbines (WTs). The introduction of this strategy enhances the overall performance of the WT. In particular, the fore-aft and side-to-side accelerations of the WT tower are significantly reduced, whilst a steadier power output is obtained, in comparison to the standard baseline pitch controller. Furthermore, our designed pitch control’s main advantage, with respect to the baseline, is its ease of implementation and reduced complexity as it does not require a gain-scheduling technique, nor pitch position measurement (thus, it is insensitive to pitch sensor faults). The proposed approach has been simulated on the NREL 5-MW prototype offshore turbine model, mounted on a jacket support. The simulations are carried out using the aero-hydro-servo-elastic simulator FAST, and key observations are thoroughly discussed.
Highlights
It will be especially offshore wind energy that will account for the highest contributions due to its large-sized wind turbines (WTs), greater and steadier wind velocities that raise the capability of producing energy at a country-scale level and the fact that new suitable available onshore sites for deployments are becoming scarce in Europe [1]
By controlling the power harnessed at each moment, the blade pitch control enhances the operational flexibility of the WT, as well as providing stability, a greater robustness and a more efficient integration in the power grid
These controllers are frequently used in the industry, and they are used in research, in conjunction with the FAST (Fatigue, Aerodynamics, Structure and Turbulence) software, for the comparison to new control developments
Summary
The pitch control design contributes to maintain the wind tower vibrations within acceptable limits On this matter, in the work by Jonkman et al [4], a controller for a 5-MW offshore wind turbine is proposed. In the work by Jonkman et al [4], a controller for a 5-MW offshore wind turbine is proposed This has become a commonly-used controller in the industry, and it is nowadays used in research for comparison to new control developments (e.g., [5,6,7,8]). On the other hand, related to its performance and according to the numerical simulations, the fore-aft and side-to-side accelerations of the WT tower are considerably attenuated This is an important achievement from the structural point of view (e.g., [9]).
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