Method and system for control power in remote dc power systems

Patent metadata

Field	Value
Publication number	US-2016359365-A1
Application number	US-201615241968-A
Country	US
Kind code	A1
Filing date	Aug 19, 2016
Priority date	Dec 22, 2010
Publication date	Dec 8, 2016
Grant date	—

Abstract

A method and system for a control power supply system is provided. The control power supply system includes a first conductor configured to carry a direct current (DC) electrical current from a source to a load, a second conductor configured to carry the DC electrical current from the load to the source, and an AC power source coupled to at least one of the first and the second conductors, the AC power source configured to superimpose a selectable relatively high frequency AC component onto the DC electrical current to generate a composite power signal.

First claim

1 - 7 . (canceled)

8 . A control power supply system comprising:
a first conductor configured to carry a direct current (DC) electrical current from a source to a load; a second conductor configured to carry the DC electrical current from the load to the source; and an AC power source coupled to at least one of said first and said second conductors, said AC power source configured to superimpose a selectable relatively high frequency AC component onto said DC electrical current to generate a composite power signal.

9 . A control power supply system in accordance with claim 8 , further comprising a filter network configured to extract the superimposed AC component from the DC electrical current.

10 . A control power supply system in accordance with claim 9 , wherein said filter network comprises a transformer configured to generate an isolated control power voltage level using the superimposed AC component of the composite power signal.

11 . A control power supply system comprising:
a first conductor configured to carry a direct current (DC) electrical current from a source to a load; a second conductor configured to carry the DC electrical current from the load to the source; a buck converter configured to step-down voltage using a plurality of semiconductor switches wherein the plurality of semiconductor switches generate an AC ripple current by switching action; and a ripple filter electrically coupled to an output of said buck converter, said ripple filter configured to filter the AC ripple component of the output of said buck converter and transmit the filtered output to a control and auxiliary supply system.

12 . A control power supply system in accordance with claim 11 , further comprising a voltage divider comprising at least one of capacitors, inductors, and a combination thereof.

13 - 15 . (canceled)

16 . A method of supplying a control power supply from a DC power cable, said method comprising:
superimposing an AC control power supply voltage onto a DC power cable at a sending station end; extracting the superimposed AC control power supply voltage from the DC power cable at a load station end; and transmitting the AC control power supply voltage to the control power supply.

17 . A power supply system for subsea loads, said power supply system comprising:
a sending station coupled to a first end of a DC power cable, said sending station positioned above a sea surface and configured to direct a flow of DC current into said DC power cable; a load station coupled to a second end of the DC power cable, said load station positioned below said sea surface and configured to receive the flow of DC current and transmit the DC current to one or more loads; and a control power supply system powered from said DC power cable proximate said load station and configured to provide a DC voltage supply to a control power circuit.

18 . A control power supply system in accordance with claim 17 , wherein said control power circuit comprises an active switching device configured to facilitate converting the DC voltage at a first level to a DC voltage at a second level different from the first level.

19 . A control power supply system in accordance with claim 17 , further comprising a capacitive voltage divider configured to supply start-up power to said control power circuit and a second auxiliary power supply configured to supply operating power to said control power circuit.

20 . A control power supply system in accordance with claim 19 , further comprising:
a plurality of electrical devices electrically coupled in series with said DC power cable, each said electrical devices configured to only fail in a shorted condition such that failure of any of the electrical devices maintains a direct current (DC) ring bus using said DC power cable; a buck converter configured to step-down voltage using a plurality of semiconductor switches wherein the plurality of semiconductor switches generate an AC ripple current by switching action; a ripple filter electrically coupled to an output of said buck converter, said ripple filter configured to filter the AC ripple component of the output of said buck converter and transmit the filtered output to a control and auxiliary supply system.

21 . A control power supply system in accordance with claim 17 , further comprising an AC power source coupled to the DC power cable, said AC power source configured to superimpose a selectable relatively high frequency AC component onto said the DC power cable to generate a composite power signal.

22 . A control power supply system in accordance with claim 21 , further comprising a filter network configured to extract the superimposed AC component from the DC electrical current.

Assignees

• Gen Electric

Inventors

• Schroeder Stefan
• Sihler Christof Martin
• Rosado Sebastian Pedro

Classifications

• H02J13/0096 Primary

  Electricity · mapped topic

• H02J3/01

  Arrangements for reducing harmonics or ripples · CPC title

• H02J3/36 Primary

  Arrangements for transfer of electric power between AC networks via high-voltage DC [HVDC] links; Arrangements for transfer of electric power between generators and networks via HVDC links · CPC title

• H02J11/00

  Circuit arrangements for providing service supply to auxiliaries of stations in which electric power is generated, distributed or converted · CPC title

• Y02E60/60

  Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD] · CPC title