Active vibration minimization in drive systems of wind power plants by PID state control

The Control Methods of the drive system in a wind energy converter has a significant influence on the operational behavior of the system. In this paper, a number of speed and torque control methods introduced and compared with special interest to active damping of vibrations in the drive system. The design of two control concepts (speed and torque) for an active vibration damping - based on the principle of the PID state control - is presented. The challenges with respect to the choice of the layout methods pole placement and LQR and respect to recording of the states (which are hardly measurable or only with great efforts) (layout of a Kalman observer). The advantages and disadvantages during operation are discussed and comparison is made with a standard PID control method and the test results are discussed with regard to the ability of an active minimization of oscillations in the drive train and the manipulated variable demand.