Feedback linearization control for a wind turbine driven by a variable-speed pump-controlled hydraulic servo system

The study aims to develop a feedback linearization controller applying to a novel pitch control system for a large wind turbine driven by a variable-speed pump-controlled hydraulic servo system. The variable-speed pump-controlled hydraulic servo system is composed of an AC servo motor, a constant displacement hydraulic piston pump two differential hydraulic cylinders and hydraulic circuits. Finally, the mathematic model is verified by the experimental test rig and the tracking performance in both 5^th order polynomial and sinusoidal path are implemented by the proposed feedback linearization controller.