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In the last years the power system industry is rapidly changing. The traditional centralized systems, which grew as a result of large-scale integration, are going to be replaced by the dispersed or distributed generation that is situated closer to the consumers. The future power supplying will be done by the combination of well-established central power networks and micro grids (MG), with the maximal possibility of renewable energy sources (RES) utilization in the place of the micro-grids situation. This type of network will use the best combination of technologies to meet the specific capacity, quality, reliability and thermal requirements of customers. For the MG good control, it is necessary to know dynamic behaviour of the system. The paper deals with modeling possibilities of MG with invertors.