Nonlinear adaptive power tracking control of variable-speed wind turbines

Various power control strategies in variable-speed wind turbines assume that the whole system parameters are known and accurate wind speed measurements are available, which is not necessarily satisfied in practice. In this article, two nonlinear adaptive control strategies, which are independent on the knowledge of the system parameters and the wind speed measurements, are proposed for power regulation and tracking, in variable-speed wind turbines. One of these strategies does not even require the rotor acceleration, differently from other works. Both control strategies are formally proven by the Lyapunov method. The effectiveness of the proposed controllers is illustrated using the FAST wind turbine simulator under a turbulent wind profile.

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Determination of rated wind speed for maximum annual energy production of variable speed wind turbines

Applied Energy ◽

10.1016/j.apenergy.2017.08.079 ◽

2017 ◽

Vol 205 ◽

pp. 781-789 ◽

Cited By ~ 42

Author(s):

Ahmad Sedaghat ◽

Arash Hassanzadeh ◽

Jamaloddin Jamali ◽

Ali Mostafaeipour ◽

Wei-Hsin Chen

Keyword(s):

Wind Speed ◽

Wind Turbines ◽

Energy Production ◽

Variable Speed

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Robust Wind Speed Estimation and Control of Variable Speed Wind Turbines

Asian Journal of Control ◽

10.1002/asjc.1779 ◽

2018 ◽

Vol 21 (2) ◽

pp. 856-867 ◽

Cited By ~ 6

Author(s):

Oscar Barambones

Keyword(s):

Wind Speed ◽

Wind Turbines ◽

Speed Estimation ◽

Variable Speed ◽

Estimation And Control ◽

And Control

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Comparison between linear and nonlinear control strategies for variable speed wind turbines

Control Engineering Practice ◽

10.1016/j.conengprac.2010.06.010 ◽

2010 ◽

Vol 18 (12) ◽

pp. 1357-1368 ◽

Cited By ~ 89

Author(s):

B. Boukhezzar ◽

H. Siguerdidjane

Keyword(s):

Nonlinear Control ◽

Wind Turbines ◽

Control Strategies ◽

Variable Speed ◽

Linear And Nonlinear

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Investigation on the impact of design wind speed and control strategy on the performance of fixed-pitch variable-speed wind turbines

Renewable Energy and Power Quality Journal ◽

10.24084/repqj09.528 ◽

2011 ◽

pp. 1015-1020

Author(s):

X. Liu ◽

L. Wang ◽

X. Tang

Keyword(s):

Wind Speed ◽

Wind Turbines ◽

Control Strategy ◽

Variable Speed ◽

Design Wind Speed ◽

And Control ◽

The Impact ◽

Fixed Pitch

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Analysis of the Implementation of the Primary and/or Inertial Frequency Control in Variable Speed Wind Turbines in an Isolated Power System with High Renewable Penetration. Case Study: El Hierro Power System

Electronics ◽

10.3390/electronics9060901 ◽

2020 ◽

Vol 9 (6) ◽

pp. 901 ◽

Cited By ~ 1

Author(s):

Guillermo Martínez-Lucas ◽

José Ignacio Sarasúa ◽

Juan Ignacio Pérez-Díaz ◽

Sergio Martínez ◽

Danny Ochoa

Keyword(s):

Wind Speed ◽

Power Systems ◽

Power System ◽

Wind Turbines ◽

Wind Farm ◽

Frequency Control ◽

Frequency Regulation ◽

Variable Speed ◽

El Hierro

With high levels of wind energy penetration, the frequency response of isolated power systems is more likely to be affected in the event of a sudden frequency disturbance or fluctuating wind conditions. In order to minimize excessive frequency deviations, several techniques and control strategies involving Variable Speed Wind Turbines (VSWTs) have been investigated in isolated power systems. In this paper, the main benefits and disadvantages of introducing VSWTs—both their inertial contribution and primary frequency regulation—in an exclusively renewable isolated power system have been analyzed. Special attention has been paid to the influence of the delays of control signals in the wind farm when VSWTs provide primary regulation as well as to the wind power reserve value which is needed. To achieve this objective, a methodology has been proposed and applied to a case study: El Hierro power system. A mathematical dynamic model of the isolated power system, including exclusively renewable technologies, has been described. Representative generation schedules and wind speed signals have been fixed according to the observed system. Finally, in order to obtain conclusions, realistic system events such as fluctuations in wind speed and the outage of the generation unit with the higher assigned power in the power system have been simulated.

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Nonlinear Systems Analysis and Control of Variable Speed Wind Turbines for Multiregime Operation

Journal of Dynamic Systems Measurement and Control ◽

10.1115/1.4028775 ◽

2014 ◽

Vol 137 (4) ◽

Cited By ~ 4

Author(s):

Greg Semrau ◽

Sigitas Rimkus ◽

Tuhin Das

Keyword(s):

Wind Speed ◽

Nonlinear Systems ◽

Wind Turbines ◽

Control Input ◽

Variable Speed ◽

Wind Speeds ◽

Speed Regulation ◽

The Stability ◽

Control Feedback ◽

Operating Regimes

The key control problems associated with variable speed wind turbines are maximization of extracted energy when operating below the rated wind speed, and power and speed regulation when operating above the rated wind speed. In this paper, we develop a nonlinear systems framework to address these problems. The framework is used to visualize and analyze the equilibria of the wind turbine as its operating regimes and controllers change. For both below rated and above rated wind speeds, we adopt nonlinear controllers, analyze the stability property of the resulting equilibria, and establish the criterion for switching between control regimes. Further, the regions of attraction of the resulting equilibria are determined, and the existence of a common region of attraction, which allows stable switching between operating regimes, is shown. The control input maintains continuity at the point of switching. We next provide a method for blade pitch modulation to control rotor speed at high wind speeds. Through Lyapunov stability analysis, we prove stability of the equilibria in the presence of the two independently functioning torque- and pitch-control feedback loops. Simulation results are presented and the controller is compared with existing works from the literature.

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