This paper investigates the influence of different factors (such as load and capacitive compensation levels, load and turbine dynamic behaviors, machine parameters) on induction generator self-excitation phenomena and related overvoltages, resulting from a fault andor an unwanted network disconnection. Simulations are performed on a 25 kV distribution network related to an actual project of integration of a nonutility induction generator to the Hydro-Que%ec system. The paper presents the analysis of the results, as well as the derived guidelines for the determination of new relay settings and integration criteria for the Hydro-Qu6bec distribution network.Kevwords. -Induction generator, self-excitation, system disconnection, dynamic simulation, distribution network, relay settings.
APPENDIXThe induction generator parameters are as follows : R1 = 0.0134 P.U. R2 = 0.0082 P.U. Xi = 0.1278 P.U. X, = 0.1236 P.u. Vbase = 4 kV X, = 3.904 P.U. for g = -0.0088 R2 = 0.0302 P.U. X, = 0.0613 p.u. for g = -1.0 The resistances and reactances are expressed in per unit on the machine voltage and MVA ratings. Sbase = 3.219 MVA H = 0.372 S.
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