Low loss stabilizer

Details Low loss stabilizer Low loss stabilizer

1979-09-14

1982-01-19

Miller, J. D.

Electricity: single generator systems

Automatic control of generator or driving means

Plural conditions

322 58, 322100, 322 29, H02H 706

Patent

active

043112536

ABSTRACT:
A dynamic stabilizer of the type which is utilized to compensate or stabilize the effect of subsynchronous 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 maintained at two quiescent conduction intervals of 90.degree. and 135.degree. depending upon the peak value of rotor oscillation. If the peak value of rotor oscillation is sufficiently small the lower conduction interval of 90.degree. 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.degree. quiescent conduction interval are relatively small when compared with the larger quiescent conduction interval. If on the other hand the generator speed peak oscillations become very large necessitating extended dynamic range for the stabilizer the quiescent conduction interval is changed automatically to 135.degree.. 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.

REFERENCES:
patent: 4080559 (1978-03-01), Wright et al.

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