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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 "ATP -Alternative Transients Program". 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 (IPP) 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.Keywords-distributed generation, synchronous generator, voltage profile, voltage regulator, speed regulator. I. NOMENCLATUREt V = voltage at the independent generator bus bar (pu), ref V = reference voltage (pu), a K = regulator gain, f K = time gain for the regulator stabilizer circuit, a T = regulator amplified time constant (s), f T = time constant for the regulator stabilizer circuit (s). max V = maximum limit for the regulator output voltage (pu), min V = minimum limit for the regulator output voltage (pu), f E = field voltage (pu), n S = rated aparent power, n U = rated voltage, L = lenght, A R = armature resistance (pu), L x = armature laeakage reactance (pu), d x = direct axis reactance (pu), q x = quadrature axis reactance (pu), `d x = direct axis transient reactance (pu), `q x = quadrature axis transient reactance (pu), ``d x = direct axis sub transient reactance (pu), ``q x = quadrature axis sub transient reactance (pu), 0 x = zero sequence reactance (pu), `0 d T = direct axis transient short-circuit time constant (s), `0 q T = quadrature axis transient short-circuit time constant (s), ``0 d T = direct axis sub transient short-circuit time constant (s), ``0 q T = quadrature axis sub transient short-circuit time constant (s), H = inertia moment (Kg.m 2 ), P = pole number, f = frequency (Hz), s ω = synchronous speed (rad/s).

No abstract

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 are modeled in the "ATP -Alternative Transients Program". 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 generation 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.

No abstract