Evaluation of Medium Voltage Distribution Network with/without Distributed Generation using ATP Software

Abstract

Abstract. This research has as main objective to analyze the contributions of a distributed generation unit when connected to a medium voltage distribution feeder (13.8 kV). The behaviour this electrical system is evaluated following the occurrence of some disturbances. Before this, all the modelling of the electrical system was performed using ATP -Alternative Transients Program. Three types of disturbances were simulated: phase-toground short-circuit, islanding of part of the electrical system and load increase on the feeder. To easy the comparisons, all studies were carried out with and without the presence of the distributed generator taking into account the following variables: busbar voltage profile, output power provided by the substation and by the distributed generator when present.

Impact of Green Power Distributed Generation to Voltage Profile and Protection Issues by Different Penetration Levels - A Study Developed on ATP Draw

“…The magnitude of the voltage source is the nominal rating value of the feeder (13.8 kV) [13]. The software named "Alternative Transients Program" -ATP -was used to perform the simulations.…”

“…The power demands of the loads were also taken from reference [13], which shows the values of active and reactive powers. These loads were represented in ATP by corresponding values of resistance and inductance (constant impedance).…”

“…The lengths of the distribution lines for the modelling by ATP were also obtained from reference [13]. The conductor used in modelling is referred as CAA 336.4 whose technical data can be obtained directly from the manufacturer catalogue, which gives the following values for the resistance, inductive reactance and capacitive reactance, respectively: 0.2051 Ω/km, 0.3770 Ω/km and 0.2266 M.Ω.km.…”

“…The distributed generator used in the simulations is rated 5 MVA, 60 Hz, 4 poles. The other parameters of the generator were taken from reference [13]. To the electrical system of the generator: …”

“…The speed governor was built in a simple IEEE model, that is frequently used in dynamics and transient stability studies [13]. It is needed to remember that the influence of these governor parameters won't be studied in this paper.…”