Author(s) :

Ibrahim, S. B., Gonoh, B. A..

Volume/Issue :

Abstract :

The paper presents a digital computer model for the simulation of an Induction machine which takes into account the magnetizing flux saturation effect. The conventional constant parameter model is often inaccurate in predicting certain states of the machine during large signal transient conditions such as on-line starting. To remedy this inconsistency, the saturable magnetizing reactance model is proposed that accounts for saturation effect in the mutual flux of the machine, and which gives better performance prediction when compared to the conventional constant parameter model. Using this model of saturation, the transient performance characteristics of the machine such as stator phase current, electromagnetic torque, run-up speed when the machine is started on-line with no-load have been simulated and have been correlated with results predicted by the conventional constant parameter model. The computer simulation for the induction machine was conveniently obtained from the dynamic equations which describe the machine in a stationary reference frame. The saturable magnetizing reactance model clearly demonstrates an improvement over the conventional constant parameter model showing that detailed representation of saturation effects could be important in Induction machine analysis, particularly, when the machine is subjected to large –signal disturbances such as on-line starting.

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