Abstract
Pitch Control plays a significant role for a large wind turbine. This study investigates a novel robust hydraulic pitch control system of a large wind turbine. The novel hydraulic pitch control system is driven by a novel high efficiency and high response hydraulic servo system. The pitch controller, designed by two degree-of-freedom (2-DOF) motion control with feedback linearization, is developed to enhance the controllability and stability of the pitch control system. Furthermore, the full-scale testbed of the hydraulic pitch control system of a large wind turbine is developed for practically experimental verification. Besides, the wind turbine simulation software FAST is used to analyze the motion of the blade which results are given to the testbed as the disturbance load command. The 2-DOF pitch controller contains a feedforward controller with feedback linearization theory to overcome the nonlinearities of the system and a feedback controller to improve the system robustness for achieving the disturbance rejection. Consequently, the novel hydraulic pitch control system shows excellent path tracking performance in the experiments. Moreover, the robustness test with a simulated disturbance load generated by FAST is performed to validate the reliability of the proposed pitch control system.
Highlights
Wind energy has become one of the most important renewable energies due to the increasing consumption of fossil energy and the technological advancements in generating power
This paper proposes the novel hydraulic pitch control system of wind turbine driven by a variable rotational speed electro-hydraulic pump-controlled system with an AC servo motor, as shown in Figure 1, which consists of two differential cylinders controlled by a variable rotational speed hydraulic pump-controlled system
This paper proposed a novel hydraulic pitch control system of wind turbines driven by a variable rotational speed pump‐controlled hydraulic system controlled by the 2‐DOF controller
Summary
Wind energy has become one of the most important renewable energies due to the increasing consumption of fossil energy and the technological advancements in generating power. Energies 2016, 9, 791 robust control of a wind turbine for the rated-speed and the variable-power operation regime were developed [11]. Through controlling the variable pitch angle of blades, the rotational speed of the wind turbine can be kept to generate rated electric power. High response and high energy efficiency hydraulic systems were proposed [19], which involved an electric-hydrostatic driven system with an AC servo motor and a constant displacement internal gear pump for power-saving motion control. The developed novel pitch control system controlled by the robust 2-DOF controller will be realized and verified for the pitch path tracking control and path-positioning control by practical experiments in the full-scale testbed under different path profiles, load torques, and wind speed
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