In the recent years, the using of renewable energy power generation method is increasing. For power system stability in installation of renewable energy power generation, the mitigation of influence is very important. A micro-grid is a network system that attempts the coexistence of utility grid and distributed generation. The micro-grid should take a connection system form that adjusts to the area. This paper discusses different interconnections of micro-grid and the interconnection stability. The evaluation models in the micro-grid stability are tie line power flow and frequency deviation.