Dynamic stabilizer for synchronous machines having torsional oscillations and method
US3999115A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 2, 1974 |
| Grant date | Dec 21, 1976 |
| Priority date | — |
| Expiry date | May 2, 1994 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P9/105
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
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 p…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.