Active functions implementation in smart inverters for distributed energy resources

In this paper are described some active functions that can be implemented in the inverters that interface the distributed energy resources to the grid can implement. These inverters are mainly placed in the grid for injecting the energy produced by the distributed generation, but they can do more than that taking advantage of their distributed location, being possible to control locally the power quality, to monitor electric magnitudes and reacts quickly to any event, or even to determine the grid state by characterizing disturbances or abnormal situations.