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DISCRETE-TIME BLADE PITCH CONTROL FO...

SHARIF-RAZI, ALI-REZA.

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DISCRETE-TIME BLADE PITCH CONTROL FOR WIND TURBINE TORQUE REGULATION WITH DIGITALLY SIMULATED RANDOM TURBULENCE EXCITATION.

Record Type:	Electronic resources : Monograph/item
Title/Author:	DISCRETE-TIME BLADE PITCH CONTROL FOR WIND TURBINE TORQUE REGULATION WITH DIGITALLY SIMULATED RANDOM TURBULENCE EXCITATION./
Author:	SHARIF-RAZI, ALI-REZA.
Description:	180 p.
Notes:	Source: Dissertation Abstracts International, Volume: 47-09, Section: B, page: 3926.
Contained By:	Dissertation Abstracts International47-09B.
Subject:	Engineering, Mechanical. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=8629612

DISCRETE-TIME BLADE PITCH CONTROL FOR WIND TURBINE TORQUE REGULATION WITH DIGITALLY SIMULATED RANDOM TURBULENCE EXCITATION.
SHARIF-RAZI, ALI-REZA.

DISCRETE-TIME BLADE PITCH CONTROL FOR WIND TURBINE TORQUE REGULATION WITH DIGITALLY SIMULATED RANDOM TURBULENCE EXCITATION. - 180 p.

Source: Dissertation Abstracts International, Volume: 47-09, Section: B, page: 3926.

Thesis (Ph.D.)--Oregon State University, 1986.

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.Subjects--Topical Terms:

783786
Engineering, Mechanical.

DISCRETE-TIME BLADE PITCH CONTROL FOR WIND TURBINE TORQUE REGULATION WITH DIGITALLY SIMULATED RANDOM TURBULENCE EXCITATION.
LDR:02442nmm 2200229 4500 001 1855346
005 20040610114128.5
008 130614s1986 d
035 $a (UnM)AAI8629612
035 $a AAI8629612
040 $a UnM $c UnM
100 1 $a SHARIF-RAZI, ALI-REZA. $3 1943160
245 1 0 $a DISCRETE-TIME BLADE PITCH CONTROL FOR WIND TURBINE TORQUE REGULATION WITH DIGITALLY SIMULATED RANDOM TURBULENCE EXCITATION.
300 $a 180 p.
500 $a Source: Dissertation Abstracts International, Volume: 47-09, Section: B, page: 3926.
502 $a Thesis (Ph.D.)--Oregon State University, 1986.
520 $a 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.
590 $a School code: 0172.
650 4 $a Engineering, Mechanical. $3 783786
690 $a 0548
710 2 0 $a Oregon State University. $3 625720
773 0 $t Dissertation Abstracts International $g 47-09B.
790 $a 0172
791 $a Ph.D.
792 $a 1986
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=8629612