Power Flow control is very important procedure when renewable sources are connected to electric grid. Furthermore, Most common topologies of grid tied distributed generation have inductor attached to power converters. In this article, the role of inductors linking between power converters and electric grid is analyzed. Values of these inductors can affect largely the value of Power flow (Active and Reactive power) in both sides, while phase angle between voltage of terminals determines the direction of power flow. This paper proposes MATLAB/SIMULINK models to study this impact, for different operation conditions (four quadrants I-V curves). Two methods of coils calculation are applied, in order to design the best value calculated in the proposed MATLAB/SIMULINK models.