POWER DISTRIBUTION SYSTEM AND METHOD THEREOF

• US 20110254368A1
• Filed: 11/09/2009
• Published: 10/20/2011
• Est. Priority Date: 11/26/2008
• Status: Active Grant

• Current Assignee: Siemens Energy AS
• Original Assignee: Siemens AG
• Inventors: Boe, Ove
• Granted Patent: US 8,946,928 B2
• Time in Patent Office: Days
• US Class Current: 307/18
• CPC Class Codes: B63H 21/17 by electric motor
• CPC Class Codes: H02P 5/46 for speed regulation of two or more dynamo-electric motors in relation to one another
• CPC Class Codes: H02P 5/74 controlling two or more ac dynamo-electric motors H02P5/46, H02P5/60 take precedence
• CPC Class Codes: H02P 9/107 for limiting effects of overloads
• CPC Class Codes: H02P 9/305 controlling voltage H02P9/302 takes precedence
• CPC Class Codes: H02P 9/307 more than one voltage output

Abstract

The proposed system has a plurality of generator systems, each generator system having an alternating current generator directly connected to a rectifier. The alternating current generator is rotationally coupled to a prime mover, wherein, upon operation of the prime mover, the alternating current generator produces an alternating current output , is de-synchronized to further ones of the plurality of generator systems and has a variable generator speed. The rectifier directly connected the alternating current generator is adapted to convert the alternating current output of the alternating current generator into a direct current output. A direct current distribution bus is coupled to the direct current outputs from each of the rectifiers. The system further has a plurality of inverters adapted to receive power from the direct current distribution bus, the output of each inverter being adapted to drive an alternating current motor.

Claims

1. A power distribution system comprising:

a plurality of generator systems, each comprising;

an alternating current generator rotationally coupled to a prime mover, wherein, upon operation of said prime mover, said alternating current generator produces an alternating current output, is de-synchronized to further ones of the plurality of generator systems and has a variable generator speed, and

a rectifier directly connected to said alternating current generator and adapted to convert said alternating current output of said alternating current generator into a direct current output,

a direct current distribution bus coupled to the direct current outputs from each of the rectifiers, and

a plurality of inverters adapted to receive power from said direct current distribution bus, the output of each inverter being adapted to drive an alternating current motor.

2. The system according to claim 1, wherein said rectifier in said generator system is a thyristor rectifier.

3. The system according to claim 1, wherein said rectifier in said generator system is a diode rectifier.

4. The system according to claim 1, wherein said rectifier in said generator system is a controlled rectifier adapted for sensing direct current output, further wherein said rectifier is adapted to be blocked to disconnect said direct current distribution bus from said generator system in case of an overload or short circuit of said distribution bus.

5. The system according to claim 1, wherein said rectifier in said generator system is adapted to isolate said generator from said direct current distribution bus in case of a failure of said generator.

6. The system according to claim 1, wherein each alternating current generator is directly connected to multiple rectifiers, the direct current output of each of said multiple rectifiers being coupled to multiple direct current distribution buses, each of said multiple direct current distribution buses being adapted to supply power to one or more inverters, the output of each of said one or more inverters being adapted to drive an alternating current motor.

7. The system according to claim 1, further comprising one or more auxiliary power inverters electrically coupled to said direct current distribution bus, said one or more auxiliary power inverters being adapted to provide power to auxiliary power consumption units.

8. The system according to claim 1, further comprising means for feeding power to auxiliary power consumption units directly from the output of one or more alternating current generators.

9. A method for power distribution, comprising:

coupling an alternating current generator to a prime mover, wherein, upon operation of said prime mover, said alternating current generator produces an alternating current output, is de-synchronized to further alternating current generators and has a variable generator speed,

directly connecting a rectifier to said alternating current generator, said rectifier being adapted to convert said alternating current output of said alternating current generator into a direct current output,

coupling the direct current outputs from each of the rectifiers to a direct current distribution bus, and

connecting a plurality of inverters to the direct current distribution bus, the output of each inverter being adapted to drive an alternating current motor.

10. The method according to claim 9, comprising controlling an output load of said generator connected to said rectifier by controlling an output voltage of that generator.

11. The method according to claim 9, comprising reducing an output frequency of said generator in response to a reduction in load of that generator.

12. The method according to claims 9, comprising starting up said generators asynchronously.

13. A method for distributing power comprising:

providing a plurality of generator systems, for each generator system;

coupling an alternating current generator rotationally to a prime mover, wherein, upon operation of said prime mover, said alternating current generator produces an alternating current output, is de-synchronized to further ones of the plurality of generator systems and has a variable generator speed, and

connecting a rectifier directly to said alternating current generator and adapted to convert said alternating current output of said alternating current generator into a direct current output,

coupling a direct current distribution bus to the direct current outputs from each of the rectifiers, and

receiving power from said direct current distribution bus by a plurality of inverters, and driving an alternating current motor by the output of each inverter.

14. The method according to claim 13, wherein said rectifier in each generator system is a thyristor rectifier.

15. The method according to claim 13, wherein said rectifier in each generator system is a diode rectifier.

16. The method according to claim 13, further comprising sensing direct current output by said rectifier in each generator system wherein said rectifier is a controlled rectifier, and blocking said rectifier to disconnect said direct current distribution bus from said generator system in case of an overload or short circuit of said distribution bus.

17. The method according to claim 13, further comprising isolating by said rectifier in each generator system said generator from said direct current distribution bus in case of a failure of said generator.

18. The method according to claim 13, wherein each alternating current generator is directly connected to multiple rectifiers, the direct current output of each of said multiple rectifiers being coupled to multiple direct current distribution buses, the method further comprising supplying power by each of said multiple direct current distribution buses to one or more inverters, and driving an alternate current motor by the output of each of said one or more inverters.

19. The method according to claim 13, further comprising one or more auxiliary power inverters electrically coupled to said direct current distribution bus, the method further providing power to auxiliary power consumption units by said one or more auxiliary power inverters.

20. The method according to claim 13, further comprising feeding power to auxiliary power consumption units directly from the output of one or more alternating current generators.