Dynamic equivalent of an industrial induction motor load by parameter identification

Abstract

A method is proposed to represent an induction motor group by a third order nonlinear model of an equivalent induction machine for transient stability studies. The equivalent motor and load parameters are obtained by a parameter identification technique which requires no knowledge of the individual machine and load parameters of the motor group beyond its overall current response to a voltage dip field test. With a simulated four induction motor group representing a statistically typical industrial load, the equivalent machine is shown to predict satisfactorily the machine group behavior under power system fault conditions.