To improve the transient stability of high ceiling voltage with the design of withstand voltage value of the same generator field winding by changing the rectifying circuit of a generator exciting device from six phases to 12 phases, reducing spike voltage generated from a rectifier, and raising exciting output voltage by reduced quantity.
A device is constituted of the rectifier of a three phase bridge rectifying system, which is constituted of exciting transformers and thyristor elements 2, and field breakers 4. The exciting transformers are set to be the split transformers 6 of secondary two windings, and the rectifier is set to be a 12 phase rectifier 7 connected to the secondary windings of the exciting transformers. Spike voltage generated from the rectifier is reduced. The ceiling voltage of the exciting device is regulated by the withstand voltage value of the generator field winding and the withstand voltage value is regulated by a value containing instantaneous voltage fluctuation. The spike voltage of the rectifier is considered and ceiling voltage is selected. Then, the maximum output voltage of the exciting device can be raised by reducing a spike voltage ratio, ceiling voltage is raised and the transient stability of a transmission system can be improved.
IDENO HISAYUKI
OTA HIROAKI
HITACHI ENG CO LTD
Next Patent: LINEAR DRIVE DEVICE