AGC for distributed generation

In this paper a microgrid consisting of wind turbine generators, aqua electrolyzer, fuel cell and diesel generator is examined. The wind generator is controlled using a constant power strategy, to reduce the power fluctuation due to wind speed variations. On the other hand power produced from all the other distributed generation (DG) sources are regulated by simple PI controllers. As the balance between the load and generation changes, the power system frequency deviates. In order to reduce these frequency deviations, the PI controllers, used to regulate the power flow from DGs, are tuned through trial and error method. The simulation results show that the employed PI controllers for the DGs perform satisfactorily in a range of operating conditions to enable automatic generation control.