Control and supply system

• US 20050185349A1
• Filed: 10/30/2001
• Published: 08/25/2005
• Est. Priority Date: 10/30/2000
• Status: Active Grant

• Current Assignee: Schlumberger Technology Corporation (Schlumberger NV)
• Original Assignee: Cooper Cameron Corporation (Schlumberger NV)
• Inventors: Biester, Klaus, Kunow, Peter
• Granted Patent: US 7,576,447 B2
• Time in Patent Office: Days
• US Class Current: 361/18
• CPC Class Codes: H02J 2310/12 The local stationary network supplying a household or a building
• CPC Class Codes: H02J 3/36 Arrangements for transfer of electric power between ac networks via a high-tension dc link
• CPC Class Codes: Y02E 60/60 Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
• CPC Class Codes: Y02P 80/14 District level solutions, i.e. local energy networks

Abstract

The invention relates to a control and supply system for electrical devices, comprising at least one voltage supply and control device above sea level, a subsea cable connecting said voltage supply and control device with the electrical devices, and a control and actuating device which is associated essentially in situ with the electrical devices. The aim of the invention is to improve one such control and supply system in such a way that supplies are possible over larger distances, using fewer means, obtaining higher efficiency and making better use of the system. In order to achieve this, the voltage supply and control device comprises at least one AC/DC converter for producing a direct voltage in order to feed the subsea cable, the control and actuating device is associated with at least one DC/DC or DC/AC converter for converting the direct voltage transmitted by the sub-sea cable into a direct voltage or an alternating voltage, and the voltage generated thereby can be transmitted to the electrical device via the connecting line.

Claims

1. A control and supply system for subsea electrical devices comprising:

at least one voltage supply and control device above sea level;

a subsea cable connecting said voltage supply and control device with the electrical devices;

a control and actuating device arranged in situ with the electrical devices;

a connecting line connecting said control and actuating device to the electrical devices;

wherein said voltage supply and control device comprises at least one AC/DC converter and is adapted to produce a first direct voltage that is fed into said subsea cable; and

wherein the control and actuating device comprises at least one DC/DC or DC/AC converter for converting the direct voltage transmitted by said subsea cable into a second voltage such that the second voltage can be transmitted to the electrical devices via said connecting line.

2. The control and supply system according to claim 1, further comprising an alternating voltage source connected to the voltage supply and control device and adapted to supply a three-phase alternating voltage.

3. The control and supply system according to claim 1, wherein said voltage supply and control device and said control and actuation device each comprise at least one data modulation device.

4. The control and supply system according to claim 3, wherein the data modulation device of said voltage supply and control device is positioned after the AC/DC converter.

5. The control and supply system according to claim 3, wherein said voltage supply and control device is connected to an external data transmission device.

6. The control and supply system according to claim 3, wherein the data modulation device of said control and actuation device is positioned after the DC/DC or DC/AC converter.

7. The control and supply system according to claim 1, further comprising an overcurrent control device assigned to the DC/DC or DC/AC converter.

8. The control and supply system according to claim 1, wherein the DC/AC converter is inductively coupled with an alternating voltage measurement device or a voltage shunt regulator.

9. The control and supply system according to claim 8, further comprising a transformer inductively coupled between the DC/AC converter and the alternating voltage measurement device.

10. The control and supply system according to claim 9, wherein the transformer comprises two separable coil half-cores which are largely symmetrical and assigned to one another.

11. The control and supply system according to claim 10, further comprising an air gap between the coil half-cores is a maximum of 4 mm and a maximum of 2 mm wide.

12. The control and supply system according to claim 10, further comprising a data modulation device assigned to each coil half-core.

13. The control and supply system according to claim 12, further comprising a coupling control device assigned to each coil half-core and adapted to control the data modulation devices of the DC/AC converter and the alternating voltage measurement device.

14. The control and supply system according to claim 8, wherein the alternating voltage measurement device is connected to the electrical devices through the connecting line.

15. The control and supply system according to claim 14, wherein the second voltage is an alternating voltage having an amplitude adapted to be measured by the alternating voltage measurement device.

16. The control and supply system according to claim 15, wherein the alternating voltage provided by the DC/AC converter is a rectangular wave voltage.

17. The control and supply system according to claim 15, wherein the alternating voltage is statically and dynamically stabilized.

18. The control and supply system according to claim 8, wherein voltage shunt regulator is formed bi-directionally.

19. The control and supply system according to claim 1, wherein the transmission of data along said subsea cable is carried out bi-directionally.

20. The control and supply system according to claim 1, wherein said subsea cable comprises a separate line for each of the electrical devices.

21. The control and supply system according to claim 1, further comprising a multiplexer device in between said voltage supply and control device and said control and actuating device.