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Adaptive pitch control of wind turbine

Technical Report:

Abstract

The wind turbines used in Denmark today to produce electric power are mostly stall-controlled turbines up to 300-400 kW. The quality of the produced electrical power from small stall-controlled wind turbines is poor compared to the electrical power from the utility grid. The main goal of this report is to describe another way of generating electric power by wind turbines. The produced power is regulated by controlling the pitch of the rotor blades. Only medium wind speeds ranging from 14 m{sup 3} to 20 m{sup 3} are considered. The regulation problem is to keep the power at the nominal value and to minimize variations in the produced power and variations in the torques acting upon the turbine. Furthermore fluctuations in the displacement of the nacelle have to be controlled so the natural frequency of the nacelle is not excited. The regulation problem is solved for the 750 kW wind turbine, Windane 40, owned by ELKRAFT. A control model is developed for use in the control design procedure and a simulation model is developed to test the designed controllers. Several controllers are designed. A continuous-time PID-controller (Proportional Integrating Differentiating) is designed because this controller is used in practical pitch-control today -  More>>
Publication Date:
Dec 31, 1993
Product Type:
Technical Report
Report Number:
NEI-DK-1731
Reference Number:
SCA: 170602; PA: DK-94:001725; EDB-95:013369; SN: 95001301456
Resource Relation:
Other Information: PBD: 1993
Subject:
17 WIND ENERGY; WIND TURBINES; INCLINATION; COMPUTERIZED CONTROL SYSTEMS; TURBINE BLADES; ADJUSTMENTS; POWER GENERATION; CONTROL EQUIPMENT; MATHEMATICAL MODELS; WIND; DESIGN; 170602; TURBINE DESIGN AND OPERATION
OSTI ID:
10105227
Research Organizations:
Technical Univ. of Denmark, Lyngby (Denmark). Inst. of Mathematical and Operations Research
Country of Origin:
Denmark
Language:
English
Other Identifying Numbers:
Other: ON: DE95723828; TRN: DK9401725
Availability:
OSTI; NTIS
Submitting Site:
DK
Size:
248 p.
Announcement Date:
Jun 30, 2005

Technical Report:

Citation Formats

Kjaer Joergensen, H. Adaptive pitch control of wind turbine. Denmark: N. p., 1993. Web.
Kjaer Joergensen, H. Adaptive pitch control of wind turbine. Denmark.
Kjaer Joergensen, H. 1993. "Adaptive pitch control of wind turbine." Denmark.
@misc{etde_10105227,
title = {Adaptive pitch control of wind turbine}
author = {Kjaer Joergensen, H}
abstractNote = {The wind turbines used in Denmark today to produce electric power are mostly stall-controlled turbines up to 300-400 kW. The quality of the produced electrical power from small stall-controlled wind turbines is poor compared to the electrical power from the utility grid. The main goal of this report is to describe another way of generating electric power by wind turbines. The produced power is regulated by controlling the pitch of the rotor blades. Only medium wind speeds ranging from 14 m{sup 3} to 20 m{sup 3} are considered. The regulation problem is to keep the power at the nominal value and to minimize variations in the produced power and variations in the torques acting upon the turbine. Furthermore fluctuations in the displacement of the nacelle have to be controlled so the natural frequency of the nacelle is not excited. The regulation problem is solved for the 750 kW wind turbine, Windane 40, owned by ELKRAFT. A control model is developed for use in the control design procedure and a simulation model is developed to test the designed controllers. Several controllers are designed. A continuous-time PID-controller (Proportional Integrating Differentiating) is designed because this controller is used in practical pitch-control today - this controller is used as a reference of performance. A LQG-controller (Least Quadratic Gaussian) and a GSP-controller (General Stochastic Poleplacement) are designed to test some conventional controllers used to solve many other regulation problems. Finally an AGSP-controller (Adaptive General Stochastic Poleplacement) is designed to test a controller that is able to change the control law according to the wind speed. The controllers are tested at different wind conditions. All controllers are compared to a wind turbine with fixed pitch angle (stall-control). Simulation studies show that all controllers give better results than the fixed pitch-controlled system. (EG) (14 refs.)}
place = {Denmark}
year = {1993}
month = {Dec}
}