Title :
Global Identification of Wind Turbines Using a Hammerstein Identification Method
Author :
van der Veen, Gijs ; van Wingerden, Jan-Willem ; Verhaegen, Michel
Author_Institution :
Delft Center for Syst. & Control, Delft Univ. of Technol., Delft, Netherlands
Abstract :
In this brief, we present a novel methodology to obtain a nonlinear data-driven model of a wind turbine. We have previously shown that the elementary dynamics of wind turbines can be represented in the form of a multivariable closed-loop Hammerstein structure, where the nonlinear mappings consist of the torque and thrust coefficients. Hammerstein systems consist of a static nonlinearity followed by a linear, time-invariant dynamic subsystem. The dynamic subsystem is identified using a new closed-loop subspace method. The nonlinearity is described using a recently developed regression framework for multivariate splines. We further propose a separable least-squares framework for recovery of the low-rank structure between the nonlinearity and the linear time-invariant system. The method is applied to a detailed simulation of the three-bladed NREL controls advanced research turbine.
Keywords :
closed loop systems; least mean squares methods; regression analysis; splines (mathematics); wind turbines; Hammerstein identification method; closed-loop subspace method; elementary dynamics; least-squares framework; linear time-invariant dynamic subsystem; low-rank structure recovery; multivariable closed-loop Hammerstein structure; multivariate splines; nonlinear data-driven model; nonlinear mappings; regression framework; static nonlinearity; three-bladed NREL control advanced research turbine; thrust coefficients; torque coefficients; wind turbine global identification; Equations; Linear regression; Mathematical model; Splines (mathematics); Technological innovation; Wind speed; Wind turbines; Aerodynamic coefficients; Hammerstein systems; closed-loop subspace identification; multivariate splines; wind energy;
Journal_Title :
Control Systems Technology, IEEE Transactions on
DOI :
10.1109/TCST.2012.2205929