Electricity: single generator systems – Generator control – With means for suppressing – eliminating or minimizing...
Patent
1976-11-15
1978-03-21
Hickey, Robert J.
Electricity: single generator systems
Generator control
With means for suppressing, eliminating or minimizing...
322 25, 322 32, 361 20, H02H 706, H02P 900
Patent
active
040805590
ABSTRACT:
Power system stabilizers are used in the excitation systems of large shaft driven synchronous dynamoelectric machines for the purpose of enhancing the dynamic stability of power generating systems. Such stabilizers using speed, power or frequency as an input signal when applied with high initial response excitation systems are effective in damping low-frequency local or inter-tie mode oscillations which may occur in the system. The power system stabilizer may adversely affect torsional damping at higher frequencies. The adverse effects of a power system stabilizer at shaft torsional frequencies are obviated by providing a torsional oscillation protection device comprising a composite band-reject filter of the present invention which attenuates the power system stabilizer output at the shaft natural torsional frequencies without introducing an excessive phase lag at the local or inter-tie mode frequencies. The invention is applicable at a universal shaft pickup location and means are provided for detecting any failure in the torsional protective device whereby the power system stabilizer output may be discontinued in the event there is a failure in torsional protection.
REFERENCES:
patent: 3167702 (1965-01-01), Schonung et al.
patent: 3465235 (1969-09-01), Schleif et al.
patent: 3656048 (1972-04-01), Hauf
patent: 3999115 (1976-12-01), South et al.
Swann Dale A.
Wright George F.
Ahern John F.
General Electric Company
Hickey Robert J.
Messenger Herbert E.
Mitchell James W.
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