This paper covers the integration of the wind turbines with the national grids which includes the quality of the power generated at the wind plants, the impact to the power systems and the details of connection systems. The system has been considered in detail together with PSS-E (Power System Simulation for Engineering) software program. The scope of the study consists of two parts: technical and economical. 30 MW Wind Power Plant consisting of 13 pieces of 2.3 MW asynchronous WTG of type 690 V, 50 Hz is investigated due to the grid compliance of WPP according to Turkish Grid Code for Wind Turbines (Annex 18) in technical part. Firstly, the reactive capability of the wind power plant and comparison of it with the requirements of the Grid Code is determined. Secondly, the low voltage right through (LVRT) capability of the wind park is assessed. Finally, the system frequency and voltage test shall be applied. In the economic section, by changing some of technical parameters, cost-benefit analysis of the economic impact will be made in order to get use of maximum wind potential that could be obtained.