Modelling and control of a wind turbine
Xin, Ma
17 WIND ENERGY; WIND TURBINES; MATHEMATICAL MODELS; COMPUTERIZED CONTROL SYSTEMS; WIND LOADS; AERODYNAMICS; STOCHASTIC PROCESSES; GAUSSIAN PROCESSES; INCLINATION; FATIGUE; OSCILLATIONS; COMPUTERIZED SIMULATION; VELOCITY; DESIGN; 170602; TURBINE DESIGN AND OPERATION
The purpose was to investigate the role and effect of control systems for a wind turbine. The pitch angle control with a constant rotor speed is described. The wind turbine system with multiple control inputs is studied. The control strategy is optimized with respect to producing a constant amount of electrical energy and reducing undesired oscillations in the systems, and high fatigue load. The wind turbine system investigated has a three-bladed rotor which is connected to an asynchronous generator by a transmission. The wind power plant is connected to a large utility grid. Attention is given to the modelling of the system. Several subsystems of the wind turbine such as wind characteristics, rotor, drive train and generator, actuator are individually modelled. The aerodynamics are described as follows: the variation of wind speed is a stochastic process, which will be modelled by a mean speed superimposed by a turbulent wind speed. The model of transmission contains a drive train. The rotor is connected to the generator by a gear box in the drive train. Eventually both the general model structure and state-space model are employed for the different controllers design. Based on the system`s model the controller design problem is handled by general stochastic pole placement design method and Linear Quadratic Gaussian method. Gain scheduling is also applied for the different operating conditions of the process. The multivariable Linear Quadratic Gaussian method controller is discussed. Dynamics of the closed-loop wind turbine were simulated. (AB) (17 refs.)
Technical Univ. of Denmark, Lyngby (Denmark). Inst. of Mathematical and Operations Research
OSTI; NTIS
Denmark
1994-12-31
English
Thesis/Dissertation
Technical Report
Other Information: TH: Thesis (ph.d.); PBD: 1993
Medium: X; Size: 180 p.
ON: DE95723827
NEI-DK-1720
Journal ID: ISSN 0105-8568; Other: ON: DE95723827; TRN: DK9401712
DK; SCA: 170602; PA: DK-94:001712; EDB-95:013368; SN: 95001301454
2008-02-12
10105223