Maximizing Wind Turbine Energy Capture Using Multivariable Extremum Seeking Control

Author:

Creaby Justin1,Li Yaoyu2,Seem John E.3

Affiliation:

1. Vestas Wind Systems, 66 Church St., Leatherhead, KT22 8DP, UK

2. Department of Mechanical Engineering, University of Wisconsin, 3200 N. Cramer St., Milwaukee, WI 53211, USA

3. Controls Group, Johnson Controls, Inc., 507 E. Michigan St., PO Box 423, Milwaukee, WI 53201-0423, USA

Abstract

Maximizing energy capture has become an important issue as more turbines are installed in low wind areas. This paper investigates the application of extremum seeking control (ESC) to maximizing the energy capture of variable speed wind turbines. The optimal control torque and pitch angle are searched via ESC based on the measurement of the rotor power. The advantage of this method is the independency from accurate turbine modelling and wind measurement. Simulation was conducted on FAST for a wind turbine dynamic model, under smooth, turbulent and field recorded wind profiles. The simulation results demonstrated significant improvement in energy capture compared to the standard control with fixed reference. An anti-windup ESC was applied to overcome the integral windup due to actuator saturation which would otherwise disable the ESC process. Finally, the integrator and high-pass filter resetting schemes were applied to improve the transient under the abrupt changes of wind.

Publisher

SAGE Publications

Subject

Energy Engineering and Power Technology,Renewable Energy, Sustainability and the Environment

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