Effect of Doubly Fed Induction Generator on transient stability analysis of grid.

This paper deals with the modelling and effect of Doubly Fed Induction Generator (DFIG) for wind turbines on transient stability analysis when connected to grid system. A reduced order model for the DFIG has been used. A controller for speed, voltage and power factor has also been implemented. The DFIG model and the controller are presented as Differential Algebraic Equations (DAE). A 7^th order model for synchronous machine with IEEE type-I exciter has also been presented. The DAEs have been solved using Simultaneous Implicit (SI) method. Si-method is a numerical method that is widely used in industries now-a-days. Particle Swarm Optimization (PSO) has been implemented to optimize the DFIG controller gains. TSA simulation results for three 8 bus power system networks, with DFIG and infinite bus, with only synchronous machine and with DFIG and synchronous machine in the network, have been presented.