Date of Award

5-1-2011

Degree Name

Master of Science

Department

Electrical and Computer Engineering

First Advisor

Hatziadoniu, Constantine

Abstract

The stability of fixed-speed wind turbines in case of fault happening in the grid is studied in this thesis by determining the critical rotor speed. Fixed-speed wind turbines are subjected to various types of fault when they are connected directly to grid [3]. In this study, the critical rotor speed is the maximum speed that the rotor of the wind turbine can reach before the wind turbine loses its stability. The factors that can affect the critical rotor speed are investigated such as the generator parameters, the duration of the fault, the parameters of the grid, and the type of the fault. Simulation studies are carried out in this thesis. The results of the simulation studies show the effect of the factors mentioned above on the stability of fixed-speed wind turbines. The results also show that the time of the fault duration varies with the type of the fault; therefore, designing a protection unit by observing the rotor speed of the rotor during the fault is more suitable that designing a control unit depending on the fault duration.

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