Author(s) :

Sunusi Sani Adamu.

Volume/Issue :

Abstract :

The present energy crisis has led to renewed interest in the use of induction machines in energy conversion applications. This is due to certain advantages they posses; simple construction, rugged and low in cost. Moreover, they can easily be coupled to many types of motive power sources, as such, can be utilised in rural areas in developing countries and also in distributed generation applications. In such situations, the reliability of the self excitation is of paramount importance. This work develops a model to study the effect of machine parameters and other operating conditions on the transient excitation process of induction generators. Both linear and nonlinear models of the machine in quasi-stationary dq-reference frame are developed and simulated in Matlab/ Simulink environment. The developed linear model predicted the voltage build-up but is unbounded. On the other hand, the nonlinear model, where saturation of the mutual flux is considered, presents a more realistic picture. The study concludes that sufficient remanent magnetism, no load starting and ensuring low stator resistance and leakage reactances paths can improve the reliability of the voltage build up

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