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

Journal Article · Wed Jun 01 00:00:00 EDT 1988 · IEEE Trans. Energy Conver.; (United States)

DOI:https://doi.org/10.1109/60.4723· OSTI ID:6832863

Asgharian, R; Macdonald, D C

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), Vol. 3:2
• Country of Publication: United States
• Language: English

Related Subjects

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