Investigating the Controller Interactions of Distribution Systems with Distributed Generation

This paper investigates the interactions among multiple controllers in distribution systems in the presence of distributed generation (DG). Two doubly fed induction generator (DFIG) type wind turbines are connected to a distribution system to investigate their influence in the system. Simulation results indicate that the parallel operation of DG units and their controllers in the same network in a relatively smaller geographical area have negative interactions giving rise to control mode oscillations. It is also investigated that the coupling of the load dynamics with DG-controllers reduces the damping of the system.