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The design of turbine-generator optimal controllers including the effect of torsional modes of oscillation

Journal Article · · IEEE Trans. Energy Conver.; (United States)
DOI:https://doi.org/10.1109/60.4723· OSTI ID:6832863
;
Optimal linear control has been suggested for designing supplementary signal controllers for turbine-generators. It is shown that the design of the controller should include consideration of the torsional modes of oscillation of the rotor to obtain the best performance. The exciter voltage ceiling is shown to limit the sum of the synchronising and damping torques. Practical designs normally have to be a compromise without the maximum of either. Advantage would be gained by using the supplementary signal, normally fed to the speed governor controlling the main steam valve, for a second governor that would merely act on a fast interceptor valve. It is shown below that if torsional modes are taken into account fully in the design, a better digital supplementary controller can be designed which will improve transient and dynamic performance and also give better damping to the lower frequency torsional modes, which are those most susceptible to excitation. As the controller is designed to improve the damping of torsional modes, its frequency response need not be severely limited and the performance is correspondingly better. The action of a controller acting in the absence of torsional modes is considered first.
Research Organization:
Dept. of Electrical Engineering, Imperial College, London SW7 2BT (GB)
OSTI ID:
6832863
Journal Information:
IEEE Trans. Energy Conver.; (United States), Journal Name: IEEE Trans. Energy Conver.; (United States) Vol. 3:2; ISSN ITCNE
Country of Publication:
United States
Language:
English

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Related Subjects

20 FOSSIL-FUELED POWER PLANTS
200104* -- Fossil-Fueled Power Plants-- Components
99 GENERAL AND MISCELLANEOUS
990220 -- Computers
Computerized Models
& Computer Programs-- (1987-1989)
COMPUTERIZED CONTROL SYSTEMS
CONTROL SYSTEMS
DESIGN
DIGITAL SYSTEMS
ELECTRIC GENERATORS
ELECTRONIC CIRCUITS
OPERATION
OPTIMIZATION
OSCILLATIONS
PULSE CIRCUITS
ROTORS
SIGNAL CONDITIONERS
SIGNAL CONDITIONING
TORSION
TURBOGENERATORS
VELOCITY