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Nigerian Journal of Technology

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Modeling and Performance of a Self-Excited Two-Phase Reluctance Generator

ES Obe, IK Onwuka

Abstract


A self-excited two-phase reluctance generator (SETPRG) with balanced stator winding is presented. A unique balanced two-phase stator winding was designed with emphasis on obtaining a stator MMF waveform with minimum space harmonics. Then a mathematical model by which the dynamic behavior of the generator can be successfully predicted under various operating conditions is developed. The model developed accommodates balanced and unbalanced loading conditions. Self-excitation is achieved via capacitors connected across the two terminals of the stator windings. The performance of the generator under various loading conditions is studied. It is realized that the generator can simultaneously supply good voltage through its terminals, in both balanced and unbalanced load conditions within its rating. It is also observed to have a good voltage regulation. Furthermore, it was determined that the generator can accept a sudden addition of load without any transients in its output variables. However, slight transient behavior is noticed in the output variables when the generator loses load. These transients increases with increasing load power factor. The presence of these transients will not jeopardize performance as the magnitude is indeed small, nor does it pose a threat to the connected load for the same reason. The generator is also capable of re-building up its voltage after a short circuit fault is cleared.




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