الفهرس 
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Abstract
The wind energy is one of the renewable energy sources has been given great interest as an alternative energy sources for conventional energy sources. The wind turbine generator system is used to convert the kinetic energy of the wind into electrical energy.
The squirrel-cage self-excited induction generator (SIEG) has emerged as a suitable candidate for isolated power generation, especially in wind energy systems compared with the conventional synchronous alternator. This due to that the SIEG is characterized by its simple construction, absence of brushes, robustness, low unit cost, absence of separate sources for excitation, ease of maintenance, self protection against severe over loads and short circuits and has the ability to convert the mechanical energy to electrical energy over a wide of speeds.
In this thesis the steady-state performance of a stand-alone self-excited induction generator has been studied under different operating and loading conditions. The performance of the SIEG is fully investigated for the following cases:
1- For certain values of the terminal capacitors required for self-excitations when the parameters of the load and the speed of the machine are changed. The limits of the operating speed of the machine and the effect of other parameters on them, that would ensure successful operation are, also, studied.
2- The minimum value of capacitance that would ensure that the SIEG will self excite and operate for each load speed is determined and used as the excitation capacitance.
3- The required value of the terminal capacitance and its range, where below or above this range the machine will not operate and the variation of the terminal capacitance on the performance of the SIEG.
4- The critical load impedance which can be connected to the terminals of the SEIG without causing it to lose self excitation, and below which the machine will lose self excitation, at certain speed.
The steady-state performance of SEIG with capacitance has been studied for the usually used two configurations which are the long-shunt and the short-shunt configurations. In both configuration resistance and inductive loads were considered
In this thesis the performance of the self-excited induction generator, when it is matched with a wide turbine is studied. The SEIG-wind turbine system considered is the variable speed-variable frequency system which extracts more power from the wind and is a economic for small and medium power.
In all of the analysis carried out in this thesis, the software package MATLAB is used.