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Transient and steady-state load performance of a stand-alone self-excited induction generator

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2 Author(s)
Salama, M.H. ; Kuwait Univ., Safat, Kuwait ; Holmes, P.G.

An original mathematical model of a stand-alone self-excited induction generator is presented. The model takes into account the nature and value of the load impedance, the load power factor, the exciting terminal capacitance and the rotor speed. The interrelationship of the parameters is demonstrated and their effect on generator performance shown. Resonance is the prime cause of excitation, but the magnetising reactance is the significant factor in determining the bandwidth of successful self-excitation. Saturation reduces the reactance and limits this bandwidth. The paper shows that a selection of capacitance and loading can compensate for saturation effects on the self-excitation process. Sufficient remanence to initiate self-excitation is assumed and it is shown that there is a critical minimum load impedance and a critical minimum value of terminal capacitance required to permit self-excitation. The critical value of capacitance for self-excitation is shown to be significantly affected by the rotor speed and the load power-factor. A second mathematical model in the form of a lumped-parameter equivalent circuit is presented. Analysis shows that the value of capacitance used for self-excitation and the nature of the load significantly affect magnetising reactance. Simulation results are applied to a range of induction machines (>5 kW) to be used in stand-alone microhydro generating systems

Published in:

Electric Power Applications, IEE Proceedings -  (Volume:143 ,  Issue: 1 )

Date of Publication:

Jan 1996

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