Owing to the increasing penetration of renewable energy resources in the electric grids, the need for systematic studies of the impact of wind power on voltage, synchronous (angle) and frequency stability of the grid is encouraged. Unlike the massive literatures for stability issues with conventional energy resources, the corresponding research efforts for Wind Energy Conversion Systems (WECS) are still highly demanded. In this paper, a comprehensive methodology for realizing an efficient, versatile and accurate modeling for grid-integrated WECS for transient stability studies is explored. Details for representing the wind aerodynamics, drive trains, wind generators in addition to other conventional synchronous generators with its control mechanisms are outlined. The presented study is conducted with the known IEEE 3-generator, 9-bus power system network as a simulation example. Some explanation cases are illustrated examining the system voltage, angle and frequency stability.