Low loss stabilizer

Details Low loss stabilizer Low loss stabilizer

H - Electricity

02

P

322/15

H02P 9/00 (2006.01) H02H 7/06 (2006.01) H02J 3/24 (2006.01)

Patent

CA 1140990

26 48, 380 ABSTRACT OF THE DISCLOSURE A dynamic stabilizer of the type which is util- ized to compensate or stabilize the effect of subsynchro- nous resonance oscillations in a turbine generator system is taught. Silicon controlled rectifiers are connected in series with inductors between the lines of the electrical system. The silicon controlled rectifiers may be main- tained at two quiescent conduction intervals of 90° and 135° depending upon the peak value of rotor oscillation. If the peak value of rotor oscillation is sufficiently small the lower conduction interval of 90° is utilized as this is sufficient to stabilize low level oscillations. Furthermore, it has great advantage in the fact that the losses represented by 90° quiescent conduction interval are relatively small when compared with the larger quies- cent conduction interval. If on the other hand the gener- ator speed peak oscillations become very large necessita- ting extended dynamic range for the stabilizer the quies- cent conduction interval is changed automatically to 135°. This provides the needed dynamic range. A short time after the circuit has been stabilized in this region the circuit is automatically returned to a disposition in which the minimum conduction angle is utilized.

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