Electricity: single generator systems – Automatic control of generator or driving means – Speed or frequency of generator
Patent
1989-04-20
1991-07-02
Hickey, R. J.
Electricity: single generator systems
Automatic control of generator or driving means
Speed or frequency of generator
322 35, 322 47, H02P 900, H02P 946
Patent
active
050292889
ABSTRACT:
A method and apparatus for operating a variable speed power generation system in which the generated output of an induction generator is adjusted by controlling current in the secondary side of the induction generator. Rotation speeds of the induction generator coupled to a prime mover are detected, a secondary current command for controlling a difference between a detected rotation speed and a speed command to be zero is generated, and current in the secondary side of the induction generator is controlled on the basis of the secondary current command. In addition, the generated output of the induction generator is sequentially detected in order that a command value of the speed command is sequentially changed when a detected generated output shows a tendency to increase and, when a detected generated output shifts from an increasing tendency to a decreasing tendency, the command value of the speed command is once changed to a lower speed value and thereafter returned to a higher speed value, thereby maximizing efficiency of the variable speed power generation system and reducing costs.
REFERENCES:
patent: 4661762 (1987-04-01), Baker
patent: 4697135 (1987-09-01), Brandon
patent: 4870339 (1989-09-01), Furukawa et al.
Kubota Yuzuru
Okuyama Toshiaki
Hickey R. J.
Hitachi , Ltd.
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