Patent EA-003265-B1 (EA)
Title: Rotating power system stabilizer
Inventor: GERTMAR LARS
IPC: H02K19/28
Filed: 2000-04-26
Abstract: 1. Power system stabiliser comprising a rotating electrical main machine (2,2'), windings (14) of a stator (12) are connected to the electric power network terminals, a current converter (18,18') connected to it a voltage source, the current converter (18,18') is also connected to the alternating current windings (16) of the rotor, whereby electric power is exchanged via the power line terminals by changing the rotational speed of the rotor (10). 2. Power system stabiliser according to claim 1, characterised in that the voltage source is a voltage source, which is independent of the power lines. 3. Power system stabiliser according to claim 1 or 2, characterised in that the voltage source is a regulating machine (20,20'). 4. Power system stabiliser according to claim 1,2 or 3, characterised in that the regulating machine (20,20') and the main machine (2,2') has a common shaft (22). 5. Power system stabiliser according to claim 4, characterised in that the current converter (18') is arranged at the static parts of the main machine and connected to the rotor windings (16) of the main machine via brushes (30) and slip rings (32). 6. Power system stabiliser according to claim 4, characterised in that the regulation machine (20) and the main machine (2) are brushless and in that the current converter (18) is arranged co-rotating at the shaft (22) of the rotor. 7. Power system stabiliser according to any of the claims 1 to 6, characterised by a flywheel arranged at the shaft (22) of the electrical main machine. 8. Power system stabiliser according to any of the claims 1 to 7, characterised by a driving means arranged for applying a force to the shaft (22) of the electrical main machine. 9. Power system stabiliser according to any of the claims 1 to 8, characterised by a load means arranged for collecting of the driving force of the shaft (22) of the electrical main machine. 10. Power network comprising power lines and a shunt stabiliser (84, 84A, 84B) of a parallel type according to claim 1. 11. Power network according to claim 10, characterised in that the voltage source is a voltage source, which is independent of the power lines. 12. Power network according to claims 10 or 11, characterised in that the voltage source is a regulating machine (20,20'). 13. Power network according to claims 10 to 12, characterised in that the regulating machine (20,20') and the main machine (2,2') has a common shaft (22). 14. Power network according to claim 13, characterised in that the current converter (18') is arranged at the static parts of the main machine and connected to the rotor windings (16) of the main machine via brushes (30) and slip rings (32). 15. Power network according to claim 13, characterised in that the regulation machine (20) and the main machine (2) are brushless and in that the current converter (18) is arranged co-rotating at the shaft (22) of the rotor. 16. Method for stabilising of the voltage in a power system comprising transmitting of electric power between a power line and a rotating electrical main machine (2,2'), characterised by regulating the, by the electrical main machine (2,2') emitted/received, electric power by changing of the rotational speed of the electrical main machine. 17. Method according to claim 16, characterised in that the step of regulation comprises providing of a rotor current through rotor windings (16) at the electrical main machine (2,2'); controlling of amplitude, phase and frequency of the rotor voltage for achieving of required amplitude, phase and frequency of the voltage over stator windings (14) at the electrical main machine (2,2'). 18. Method according to claim 17, characterised in that the regulation power of the rotor winding of the main machine is provided by a regulation machine (20,20'). 19. Method according to claim 18, characterised in that a shaft of the regulation machine (20,20') is mechanically driven by a shaft (22) of the electrical main machine (2,2'). 20. Method according to any of the claims 16 to 19, characterised by sensing of current/voltage of the power line for detecting of disturbances in its amplitude, virtual value, phase or frequency; whereby the regulation takes place based on at least one of the detected disturbances. 21. Method according to claim 20, characterised by sensing of the temperature of the stator windings (14) of the main machine; whereby the regulation takes place based also on the stator temperature. 22. Method according to claim 20 or 21, characterised by sensing of the temperature of the rotor windings (16) of the main machine; whereby the regulation takes place based also on the rotor temperature. 23. Method according to claim 22, characterised in that the regulation step during a limited time gives electric powers that exceed rated power, valid for continuous operation, for the electrical main machine (2,2'). 24. Method according to any of the claims 16 to 23, characterised by transferring of control information between the stationary and rotating parts of the main machine. 25. Method according to any of the claims 16 to 24, characterised by transforming the voltage over the stator windings (14) of the main machine to a suitable network voltage.