Apparatus for stabilizing turbine-generator shaft torsional osci

Electric power conversion systems – Current conversion – Including an a.c.-d.c.-a.c. converter

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322 58, 363 44, H02J 336

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active

047333405

ABSTRACT:
An apparatus for stabilizing turbine generator shaft torsional oscillations including: a current detector for detecting ac current of a turbine generator used in combination with a dc power-transmission system, a filter to which an output of said current detector is delivered, the filter comprising a first bandpass filter for detecting a sub synchronous component (f.sub.l -f.sub.m) and a second bandpass filter for detecting a super synchronous component (f.sub.l +f.sub.m) where a fundamental freuency of the generator is represented by f.sub.l and a natural frequency of the mechanical shaft system of the generator is represented by f.sub.m, a calculation circuit for applying conversion of at least one of d and q axis to respective outputs from the first and second bandpass filters using a generator phase .theta..sub.G to take out at least one of .DELTA.i.sub.d and .DELTA.i.sub.q of the sub and super synchronous components, a third bandpass filter to which an output from the calculation circuit is fed, the third bandpass filter for taking out a stabilization signal therefrom, and a circuit for controlling a converter for delivering an output of the generator to the dc power-transmission system on the basis of the stabilization signal.

REFERENCES:
patent: 3883792 (1975-05-01), Ellert
patent: 4331882 (1982-05-01), Hingorani
patent: 4377780 (1983-03-01), Bjorklund
patent: 4551780 (1985-11-01), Canay
C/GRE/1980, SC14-04, M. B. Bahrman et al.; pp. 1-9; "HUDC-Turbine-Generator Torsional Interactions--A New Design Consideration".
EMTP (Electro Magnetic Transients Program), developed by Bonneville Power Administration, Portland, Oregon, U.S.A.; 1982, IEEE, SM 006-5, I. M. Canay; "A Novel Approach to the Torsional Interaction and Electrical Damping of the Synchronous Machine," pp. 1-9.
IEEE 1979, 658-6, M. Barhman, E. V. Larson et al.; pp. 1-9; "Experience with HVDC-Turbine-Generator Torsional Interaction at Square Butte".

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