主機駆動誘導発電機の二次直接励磁方式

概要

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In the marine electric power station, there are increasing needs of the maintenance-free system and the more economical running, and so, the shaft-driven ac generator is very fashioned for such a purpose, particularly in a container ship and a refrigerated cargo ship.<BR>Since output frequency of the ac synchronous generator driven by the shaft of main engine varies propor-tionally with the speed of the shaft, it needs the auxiliarly generating set like an ac inverter used thyristor, when the speed of the shaft changed widely.<BR>Induction generator used as the shaft-driven generator usually needs the auxiliarly generator and the prime mover to make the exciting field in the primary winding. But the direct secondary excited induction generator, recommended in this paper, can be adapted as a simplest shaft generator system.<BR>In this system, where mechanical speed is at synchronous speed, the do excitation is applied to the secondary winding, and is at any speed, ac excitation with the frequency correspond to the difference between synchronous speed and shaft speed, for the ac power having the rated frequency.<BR>In this paper, equivalent circuits for this system, power flow analysis and distortion of the wave-form of the output voltage under the inverter excitation are discussed.