AbstractsPhysics

Some investigations on dynamic analysis of grid connected wind energy conversion systems newlineGrowing environmental concerns and attempts to reduce dependency on fossil fuel resources are bringing renewable energy resources to the mainstream of the electric power sector Among the various renewable resources wind power is assumed to have the most favourable technical and economical prospects Wind generation technologies can be classified as newline Fixed speed wind energy conversion system FSWECS newline Partially variable speed wind energy conversion system PVSWECS newline Variable speed wind energy conversion system VSWECS newline newlineAmong the several wind generation technologies VSWECS with power electronic interface has attracted interest due to its efficient and stable utilization of wind energy than FSWECS systems On the other hand, PVWECS provides advantages such as simplicity robustness reliability and low cost in comparison to variable speed wind turbines which require a larger number of power electronic devices leading to more losses and complexity In addition it is possible to obtain a much faster output power response to wind speed variations by means of adjusting an external rotor resistance than FSWECS However PVWECS have some drawbacks such as requiring reactive power compensation system and a narrow speed range regulation typically limited to 10 slip above synchronous speed due to the excessive power that is dissipated in the external resistor newline newline%%%appendix p243-261, reference p262-268.