7.Conclusion

Over the past decades has been observed a high growth in the use of micro-grid and energy management procedures. This paper deals with optimal planning of a renewable micro-grid, connected to the main grid using mixed-integer linear programming. This micro-grid consists of renewable energy resources including wind, solar, battery and fuel cell. A simulation on a real sample is carried out and optimal schedule of units are obtained with operational cost minimization. The virtual power producer uses a central control system dealing with the management of optimal generation and load control in the micro-grid. The simulation procedure is implemented using GAMS software with CPLEX solver and Genetic algorithm. Operational cost for a 24-hour-period, taking into account the proposed scenarios, is $3183 saving $169 in comparison with Genetic algorithm. By analyzing the optimal planning of scenarios, the following results can be considered:
1- Optimal power generation in each scenario is carried out properly according to each manufacturer price comprising diesel, wind, photovoltaic, battery and fuel cell.
2- Photovoltaic power, with respect to the presence of sun, is forecasted to be between hours 6th to 19th. At the outset and end of the day, power generation is minimal; and, the maximum power generation is observed at hour 13th.
3- Scheduling of wind power is implemented proportional with forecasted power.
4- The charging of battery is occurred in low load of grid for all scenarios (nights: at hours 2nd to 5th; days: at hours 13th to 15th). With respect to low price of selling energy to the main grid in these hours, charging of battery is preferred.
5- Selling the energy to the main grid is performed at times that the sale price is in its peak value (at hours 8th to 12th and 19th to 22th).
6 - Maximum discharge of battery to provide the peak load lasted a couple of hours; and, it occurred at hours 19th to 22th and at hours 8th to 11th for selling to the main grid.
7 - All constraints of micro grid are fulfilled.

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