Discrete-time blade pitch control for wind turbine torque regulation with digitally simulated random turbulence excitation Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/h989r5443

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  • A time domain simulation model which approximates the three-dimensional velocity fluctuations of wind turbulence has been developed. This model is used in a discrete time control algorithm to regulate the output torque of a wind turbine by changing the pitch angle of the turbine blade. The wind model provides a velocity field which varies randomly with time and space and gives the proper correlation between spatial locations and velocity components. In addition, the spectral representations approximate those observed from a rotating reference frame. The version of the model described in this report is a time domain simulation. It makes use of a random number generator to construct a white noise time series with a uniform power spectral density over the frequency range of interest. This noise source is then passed through a set of appropriate linear filters to obtain the various wind velocity fluctuations which would be experienced by a rotating wind turbine blade. The blade pitch angle remains fixed in the computation of average torque values for each revolution which does not permit a continuous control action to be implemented. Therefore, a discrete control model with a time interval equal to the period of the rotor revolution is chosen. A control action which compensates for the flapping oscillation and induces a torque step response with a small overshoot which reaches steady state in a minimum number of steps is desirable. To achieve this, an integral control action is combined with a digital narrow band rejection filter. The integral control action eliminates the steady error in the resulting torque response.
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