The installed power capacity of grid-connected wind energy conversion systems (WECSs) has increased exponentially around the world. The size of each unit is also increasing as they are becoming more affordable. The grid is a highly non-linear system due to wide spread use of power electronically switched loads and devices. Hence, the grid disturbances affect the output of the WECSs. This paper presents a study of the effects of grid disturbances such as switching of loads, feeder tripping, outage and synchronization of conventional generators on the output parameters of the grid-connected wind generators. The voltage, current and power of wind generator at the point of common coupling have been analysed. Further, presence of disturbances has also been investigated using the discrete wavelet transform (DWT). The results are validated using a 1.5 MW doubly fed induction generator based wind energy conversion system integrated with a test system in MATLAB/Simulink environment.