With the increasing integration of wind energy into power systems, the behavior of wind turbines and the control of wind farms will have significant effects on the power quality of both the connected power systems and the wind farms. An essential aspect of integrating wind farms into power systems is knowledge of the transient behavior of the wind farm subject to grid faults. Grid faults may cause isolation of one wind turbine or even isolation of a large part of the wind farm from the grid. This will have a great importance in the event that the wind farm is a significant part of the power system. Thus losing part of the wind production system due to grid faults can have severe consequences on power system stability. Hence in order to design a reliable system, it is important to understand the behavior of the wind farm and to have the knowledge of wind turbines interaction with one another under grid faults.