Jiao, X.; Wang, G.; Wang, X.; Zhang, Z.; Tian, Y.; Fan, X. Anti-Windup Pitch Angle Control for Wind Turbines Based on Bounded Uncertainty and Disturbance Estimator. J. Mar. Sci. Eng.2024, 12, 473.
Jiao, X.; Wang, G.; Wang, X.; Zhang, Z.; Tian, Y.; Fan, X. Anti-Windup Pitch Angle Control for Wind Turbines Based on Bounded Uncertainty and Disturbance Estimator. J. Mar. Sci. Eng. 2024, 12, 473.
Jiao, X.; Wang, G.; Wang, X.; Zhang, Z.; Tian, Y.; Fan, X. Anti-Windup Pitch Angle Control for Wind Turbines Based on Bounded Uncertainty and Disturbance Estimator. J. Mar. Sci. Eng.2024, 12, 473.
Jiao, X.; Wang, G.; Wang, X.; Zhang, Z.; Tian, Y.; Fan, X. Anti-Windup Pitch Angle Control for Wind Turbines Based on Bounded Uncertainty and Disturbance Estimator. J. Mar. Sci. Eng. 2024, 12, 473.
Abstract
In the full load operating range, wind turbines typically use pitch control to maintain rotor speed and output power at their rated values to guarantee the whole system’s safety. Blade pitch actuators are subject to physical limitations and safety requirements, which imposes strict constraints on pitch angle’s amplitude and rate of change. These constraints will bring windup problem to the integral part of the pitch controller. It leads to deterioration of the pitch control system’s performance or even the instability problem, especially for large-scale turbines operating in extreme uncertain wind conditions or suffering from cyber attacks. This paper designs an anti-windup robust pitch angle control strategy to deal with pitch rate constraint issue to enhance the security of control system. First, to facilitate controller design, a filtered tracking error technique is employed to transform the nonaffine form into an affine one. Subsequently, a feedback robust controller based on UDE is developed to handle the model’s uncertainty and external disturbances. To address the issue of integral saturation in the pitch system and guarantee its safety, an elliptical bounded constraint is integrated into the designed UDE strategy. This bounded UDE controller can improve the stability of power generation quality, reduces the mechanical loads on components and enhance the whole system’s safety. Finally, the effectiveness of the proposed scheme is verified on the Wind Turbine Blockset platform in Matlab/Simulink. It can achieve better performance than the traditional method.
Keywords
variable speed wind turbine (VSWT); robust control; integral saturation; system safety; bounded uncertainty and disturbance estimator (UDE)
Subject
Engineering, Control and Systems Engineering
Copyright:
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
