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On dynamic load models for voltage stability studies

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4 Author(s)
Borghetti, A. ; Istituto di Elettrotecnica Ind., Bologna Univ., Italy ; Caldon, R. ; Mari, A. ; Nucci, C.A.

Appropriate modelling of dynamic loads is of primary importance in voltage stability studies. The paper deals with the modelling of a load consisting of a static load plus an aggregate of induction motors. The behavior of three simplified models for such a load configuration is compared. The three models are (A) a generic nonlinear dynamic model of the first order as proposed by Karlsson and Hill, (B) a static exponential load plus a dynamic first-order model for the induction motors, and (C) a static exponential load plus a dynamic third-order model for the induction motors. A power system with a longitudinal structure is chosen as the case-study. It is shown that for the same perturbation (tripping of one of two high-voltage parallel lines) the simulation results are quite different from each other and, in certain cases, only the third-order dynamic model correctly predicts the voltage collapse phenomena at the load bus. An interpretation of the different behavior of the various models is given

Published in:

Power Systems, IEEE Transactions on  (Volume:12 ,  Issue: 1 )

Date of Publication:

Feb 1997

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