The research in this paper focuses on the system-wide impacts on a medium size power system network with wind turbines during disturbances. The first part of this study is to construct a simplified medium size electricity supply grid of Malaysian perspective using a public domain Matlab toolbox for electric power system analysis and simulation. There are two common types of wind turbines, which are the Constant Speed Wind Turbine with Squirrel-Cage Induction Generator (CSWT) and Variable Speed Wind Turbine with Doubly Fed Induction Generator (DFIG), connected to the medium size grid at a suitable location. The main focus of this paper is to evaluate and compare the dynamic interactions and responses of both types of wind turbine when connected to the grid and subjected to typical electrical system disturbances. The disturbances are introduced by means of faults, generator tripping, line and load disconnections on different network configurations. The impact on the dynamics and stability of a power system is mainly caused by the fact that the wind turbines generating systems deployed are not based on conventional synchronous generator type.