Research on Variable Pitch Control of Blades and Hydrostatic Transmission Variable Rotational Speed Control for a 2MW Wind Turbine
Date Issued
2010
Date
2010
Author(s)
Liao, Chi-Min
Abstract
The thesis aims to develop a novel pitch control system of a large wind turbine driven by a variable-speed pump-controlled hydraulic servo system. In order to realize practical experiments of the pitch control, the full-scale test rig of the hydraulic pitch control system of a 2 MW wind turbine’s blade, including a novel mechanism of pitch control, a variable-speed pump-controlled hydraulic servo system, a disturbance system and a PC-Based control system, are designed and set up. The variable-speed pump-controlled hydraulic servo system, which contains an AC servo motor, a constant displacement hydraulic piston pump, two differential hydraulic cylinders and hydraulic circuits, performs high response and high energy efficiency, such that it is suitable for the applications in wind turbines. Besides, in order to implement the pitch control in the proposed novel pitch control system, the adaptive fuzzy controller with self-tuning fuzzy sliding-mode compensation (AFC-STFSMC) is developed to design the pitch controller. Finally, the developed variable-speed pump-controlled hydraulic servo system has been realized and verified for the path tracking control of the pitch control of the wind turbines by practical experiments in the full-scale test rig under different path profiles, load torques, and random wind speed.
The simulation results of the hydrostatic transmission varable speed control system which is used on 2 MW wind turbines are implemented in this research. Through analyzing of the simulations, the hydrostatic transmission system can replace the gear box and has many advantages used in large wind turbines.
Subjects
wind turbine
pitch control
variable-speed pump-controlled hydraulic servo system
path tracking control and adaptive fuzzy controller with self-tuning fuzzy sliding-mode compensation
hydrostatic transmission
variable speed control
SDGs
Type
thesis
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