Analysis of dynamic performance of dispersed generation connected through inverter to distribution networks

With reference to the new technologies of distributed generation, the dynamic behaviour of inverter interfaced DGs embedded on a distribution system has been studied in order to assess their influence on the system under perturbed conditions, in particular their contribution to the fault currents. The dynamic performance of inverter interfaces, with different types of controller depending upon the operation modes, has been simulated on both a grid connected radial network and an intentionally islanded portion of the network (microgrid), comparing the results with the behaviour of corresponding size traditional rotating generators connected directly to the grid. From the analysis the following considerations can be drawn.