In simulink grid considering DG's as a load and feeds power into the DG. How to rectify it?

In simulink, while connecting pv and wind system with the grid,the grid supplies the power to load even when the loads are set according to the DG generations also the power is fed into the DG, treating the DG as load. How to rectify the system, such that the grid only supplies power to loads after being fed the DG.