TY - THES
TI - Modelling and control of a wind turbine
AB - 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.)
AU - Xin, Ma
KW - 17 WIND ENERGY
KW - WIND TURBINES
KW - MATHEMATICAL MODELS
KW - COMPUTERIZED CONTROL SYSTEMS
KW - WIND LOADS
KW - AERODYNAMICS
KW - STOCHASTIC PROCESSES
KW - GAUSSIAN PROCESSES
KW - INCLINATION
KW - FATIGUE
KW - OSCILLATIONS
KW - COMPUTERIZED SIMULATION
KW - VELOCITY
KW - DESIGN
KW - 170602
KW - TURBINE DESIGN AND OPERATION
DO -
UR -
PB -
CY - Denmark
PY - 1993
DA - 1994-12-31
LA - English
J2 -
C1 - Technical Univ. of Denmark, Lyngby (Denmark). Inst. of Mathematical and Operations Research
C2 -
ER -