Abstract
A dynamic model based on instantaneous symmetrical components theory is presented for purposes of transient analysis of thyristor-controlled three-phase induction motors. The distinct advantages of this model over the phase-variable model have been highlighted. In-line switching constraints are incorporated and the simulation of all operating modes is accomplished without reference to rotor position. Typical transient response patterns are presented using the new model and comparisons are made with similar results obtained by earlier methods.

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