The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 21, 1976
Filed:
May. 02, 1974
William H South, McKeesport, PA (US);
Lee A Kilgore, Export, PA (US);
Westinghouse Electric Corporation, Pittsburgh, PA (US);
Abstract
A dynamic stabilizer which includes a voltage generator connected in series with the output terminals of a synchronous AC generator provides compensation for voltages produced by the main AC synchronous machine which compensation is provided to overcome the effects of torsional oscillation between masses in the main AC generator system. Torsional oscillations may exist between the masses of turbines driving the AC generator, the exciter mass for the AC generator, and the mass of the rotor of the generator. Shaft angular velocity is sensed and provided to a frequency discriminating filter since the speed is proportional to the torsional oscillation and since a reference signal is provided to the frequency discriminating filter, the frequency discriminating filter provides an output signal which is proportional to the reference signal plus and minus the frequency of the torsional oscillation. This signal is provided to the previously named series connected generator where a 180.degree. phase shift is effectuated between the output signal of the frequency discriminating filter and the output power from the AC synchronous generator. Scaling means is provided to conveniently match the peak amplitudes of the last named signals. The effect of the phase shift of the signal from the frequency discriminating filter as it is applied to the series connected generator is to compensate for the effect of the torsional oscillations in the output power signal of the AC synchronous generator thus providing a power signal for use in a load which is generally without modulating torsional oscillation.