Synchronous generator, excitation and speed governor modeling in ATP-EMTP for interconnected DG Studies

The main task in this paper is to present a performance analysis of a distribution network in the presence of a synchronous generator with its speed and voltage regulators, in parallel with the distribution system, for distributed generation studies. Must be highlighted that this generator is driven by a steam turbine, and the whole system with regulators and the equivalent of the power authority system in the point of connection (PAC) are modeled in the ldquoATP - Alternative Transients Programrdquo. Technical questions studied here refer to steady-state voltage profile, voltage stability, voltage dip due to a balanced three-phase fault, load rejection, distribution line outage and the behavior of machine regulators facing the aforementioned contingencies. Results show that, in some cases, the independent power producer (IPA) can be a menace to the physical integrity of the system and in other cases can be very beneficial to the distribution system in the point of connection.