WO2011021941A1 - Method and device for supply of electric power to an installation at sea - Google Patents
Method and device for supply of electric power to an installation at sea Download PDFInfo
- Publication number
- WO2011021941A1 WO2011021941A1 PCT/NO2010/000305 NO2010000305W WO2011021941A1 WO 2011021941 A1 WO2011021941 A1 WO 2011021941A1 NO 2010000305 W NO2010000305 W NO 2010000305W WO 2011021941 A1 WO2011021941 A1 WO 2011021941A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- sea
- apparatus carrier
- carrier
- electric power
- consumer
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J11/00—Circuit arrangements for providing service supply to auxiliaries of stations in which electric power is generated, distributed or converted
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B35/00—Vessels or similar floating structures specially adapted for specific purposes and not otherwise provided for
- B63B35/44—Floating buildings, stores, drilling platforms, or workshops, e.g. carrying water-oil separating devices
- B63B2035/4433—Floating structures carrying electric power plants
Definitions
- This invention relates to a method of supplying electric power to a consumer installation at sea. More particularly, it relates to the supply of electric power to a consumer installation at sea, wherein the electric power is carried by means of a supply cable that extends to shore or to a sea- based distribution plant.
- the invention also includes a device for practising the method.
- Installations, hereinafter called consumer installations, which are used for the extraction of petroleum at sea, have a considerable consumption of electric power, mainly for the operation of various pieces of equipment.
- the electric power is provided, in the main, by means of gas turbine generators. Generators of this kind occupy a not inconsiderable portion of the available area and carrying capacity of the consumer installation and, at the same time, the exhaust gases contain considerable amounts of environmentally unsafe compounds.
- cleaning power preferably produced onshore by means of hydro electric power or other environmentally friendlier methods . It is envisaged that the electric power will be carried from shore to the consumer installation by way of a cable-based distribution plant.
- the invention has for its object to remedy or reduce at least one of the drawbacks of the prior art.
- the method may be practised by means of a device for
- the device being characterized by an electrical apparatus in the form of at least a transformer or a
- the apparatus carrier may be floating and anchored in the form of a buoy- or platform-like device.
- the apparatus carrier may be placed on the seabed and project above the sea surface .
- the distance between the consumer installation and the apparatus carrier should be sufficient not to obstruct traffic around the consumer installation while, at the same time, the voltage drop on the feeding cable should be kept at an acceptable level.
- the distance may be 1 to 10 km, for example, but it is assumed that a suitable distance is in the order of a couple of kilometres.
- the feeding cable may be submerged between the consumer installation and the apparatus carrier. This is particularly appropriate in the case of great depths at the installation site .
- the feeding cable may have different buoyancies along its longitudinal extent.
- the feeding cable may have greater buoyancy at its middle portion than at its cable portions nearer to the consumer installation and/or the apparatus carrier. If necessary, the cable may be provided with external buoyancy bodies .
- the feeding cable can be arranged on or in the seabed between the consumer
- the method and the device in accordance with the invention provide a solution to a long-felt problem and can thereby contribute to a substantial reduction in the emission of environmental gases.
- Figure 1 shows schematically a plant with an apparatus
- Figure 2 shows a circuit diagram for the plant of figure 1 when the apparatus carrier receives direct current
- Figure 3 shows,a circuit diagram for the plant of figure 1 when the apparatus carrier receives alternating current
- Figure 4 shows schematically a feeding cable and cross
- the reference numeral 1 indicates an apparatus carrier in the form of a tension leg platform.
- the apparatus carrier 1 includes a buoyancy undercarriage 4 which is provided with a superstructure 6 which is above the sea surface 8.
- the buoyancy undercarriage 4 is connected to anchors 10 on the seabed 12 by means of moorings 14.
- An apparatus 16 comprising a converter 18 and a transformer 20 is arranged in the superstructure 6, see figure 2.
- a feeding cable 24 is connected to the transformer 20 and extends submergedly between the apparatus carrier 1 and the distribution plant 28 of a consumer installation 26. In a manner known per se, both the supply cable 22 and the feeding cable 24 are attached and strain-relieved in the apparatus carrier 1 and the consumer installation 26, respectively.
- the electric power supplied to the apparatus carrier 1 may be supplied via an AC supply cable 30 at alternating voltage, see figure 3.
- FIG 4 are shown, on a larger scale, cross sections of the feeding cable 24.
- the feeding cable 24 is formed in accordance with the cross section "A" of figure 4.
- the feeding cable 24 is formed in accordance with the cross section "B" of figure 4.
- the feeding cable 24 is provided with relatively light materials 36, for example in the form of a synthetic material such as polyvinyl chloride (PCV) .
- PCV polyvinyl chloride
- cross section B these areas have been replaced, at least partially, with a heavier material 38, for example in the form of metal, such as wire ropes.
- a heavier material 38 for example in the form of metal, such as wire ropes.
- the feeding cable 24 is constructed in a manner known per se with
- the feeding cable will take a desired position in the sea, extending relatively straight down from the apparatus carrier 1 and the consumer
Abstract
A method and a device for supplying electric power to a consumer installation (26) at sea, wherein the electric power is carried by means of a supply cable (22, 30) that extends to shore or to a sea-based distribution plant, the method including :- arranging an apparatus carrier (1) near the consumer installation (26); - arranging an electrical apparatus (16) in the form of at least a transformer (20) or a converter (18) on the apparatus carrier (1); - connecting the supply cable (20, 30) to the apparatus (16) which is on the apparatus carrier (1); and - connecting a feeding cable (24) between apparatus (16) located on the apparatus carrier (1) and a distribution plant (28) on the consumer installation (26).
Description
METHOD AND DEVICE FOR SUPPLY OF ELECTRIC POWER TO AN
INSTALLATION AT SEA
This invention relates to a method of supplying electric power to a consumer installation at sea. More particularly, it relates to the supply of electric power to a consumer installation at sea, wherein the electric power is carried by means of a supply cable that extends to shore or to a sea- based distribution plant. The invention also includes a device for practising the method. Installations, hereinafter called consumer installations, which are used for the extraction of petroleum at sea, have a considerable consumption of electric power, mainly for the operation of various pieces of equipment. The electric power is provided, in the main, by means of gas turbine generators. Generators of this kind occupy a not inconsiderable portion of the available area and carrying capacity of the consumer installation and, at the same time, the exhaust gases contain considerable amounts of environmentally unsafe compounds.
It is a declared aim for the authorities in several countries to seek to replace power from turbine aggregates with
"cleaner" power, preferably produced onshore by means of hydro electric power or other environmentally friendlier methods .
It is envisaged that the electric power will be carried from shore to the consumer installation by way of a cable-based distribution plant.
However it is a problem that many consumer installations have already got little or no spare space or carrying capacity, and therefore have difficulties receiving transformers or converters necessary for transforming the electric voltage from the transmission voltage into the distribution voltage of the consumer installation. If direct current (DC) is used, the power must be converted into alternating current (AC) .
These conditions constitute real obstacles in the work of reducing the emission of greenhouse gases from sea-based petroleum extraction.
The invention has for its object to remedy or reduce at least one of the drawbacks of the prior art.
The object is achieved, according to the invention, through the features which are specified in the description below and in the claims that follow.
A method is provided for the supply of electric power to a consumer installation at sea, in which the electric power is carried by means of a supply cable extending to shore or to a sea-based distribution plant, and the method includes:
- arranging an apparatus carrier near the consumer
installation;
- arranging an electrical apparatus in the form of at least a transformer or a converter on the apparatus carrier,-
- connecting the supply cable to the apparatus placed on the apparatus carrier; and
- connecting a feeding cable between apparatus located on the apparatus carrier and a distribution plant on the consumer installation.
The necessary apparatuses thereby take up neither space nor carrying capacity on the consumer installation. It is assumed that one or more of the generators may be removed after the consumer installation has been connected to the feeding cable, thereby freeing both space and carrying capacity.
The method may be practised by means of a device for
supplying electric power to a consumer installation at sea, in which the electric power is carried by means of a supply cable that extends to shore or to a sea-based distribution plant, the device being characterized by an electrical apparatus in the form of at least a transformer or a
converter being placed on an apparatus carrier which is arranged near the consumer installation, and where the supply cable being connected to the apparatus which is on the apparatus carrier, and where a feeding cable being connected between the apparatus on the apparatus carrier and a
distribution plant on the consumer installation.
The apparatus carrier may be floating and anchored in the form of a buoy- or platform-like device. Alternatively, the apparatus carrier may be placed on the seabed and project above the sea surface .
The distance between the consumer installation and the apparatus carrier should be sufficient not to obstruct traffic around the consumer installation while, at the same time, the voltage drop on the feeding cable should be kept at an acceptable level. The distance may be 1 to 10 km, for example, but it is assumed that a suitable distance is in the order of a couple of kilometres.
The feeding cable may be submerged between the consumer installation and the apparatus carrier. This is particularly appropriate in the case of great depths at the installation
site .
The feeding cable may have different buoyancies along its longitudinal extent. For example, the feeding cable may have greater buoyancy at its middle portion than at its cable portions nearer to the consumer installation and/or the apparatus carrier. If necessary, the cable may be provided with external buoyancy bodies .
It is thereby ensured that the feeding cable hangs down in the sea at the consumer installation and the apparatus carrier but has an approximately constant depth in the area between the consumer installation and the apparatus carrier.
Depending on the prevailing conditions, the feeding cable can be arranged on or in the seabed between the consumer
installation and the apparatus carrier. The use of an apparatus carrier which is near a consumer installation at sea to carry apparatuses for at least
transforming or converting wired electric power to the consumer installation may thus be practical.
The method and the device in accordance with the invention provide a solution to a long-felt problem and can thereby contribute to a substantial reduction in the emission of environmental gases.
In what follows is described an example of a preferred method and embodiment which is visualized in the accompanying drawings, in which:
Figure 1 shows schematically a plant with an apparatus
carrier according to the invention;
Figure 2 shows a circuit diagram for the plant of figure 1 when the apparatus carrier receives direct current;
Figure 3 shows,a circuit diagram for the plant of figure 1 when the apparatus carrier receives alternating current ; and
Figure 4 shows schematically a feeding cable and cross
sections thereof.
In the drawings, the reference numeral 1 indicates an apparatus carrier in the form of a tension leg platform. The apparatus carrier 1 includes a buoyancy undercarriage 4 which is provided with a superstructure 6 which is above the sea surface 8. The buoyancy undercarriage 4 is connected to anchors 10 on the seabed 12 by means of moorings 14.
An apparatus 16 comprising a converter 18 and a transformer 20 is arranged in the superstructure 6, see figure 2.
A DC supply cable 22, see figure 2, which extends to a sea- based distribution network not shown is connected to the converter 18 and passes on alternating voltage to the transformer 20.
A feeding cable 24 is connected to the transformer 20 and extends submergedly between the apparatus carrier 1 and the distribution plant 28 of a consumer installation 26. In a manner known per se, both the supply cable 22 and the feeding cable 24 are attached and strain-relieved in the apparatus carrier 1 and the consumer installation 26, respectively.
The electric power supplied to the apparatus carrier 1 may be supplied via an AC supply cable 30 at alternating voltage, see figure 3.
In figure 4 are shown, on a larger scale, cross sections of the feeding cable 24. In a middle portion 32 between the apparatus carrier 1 and the consumer installation 26, the
feeding cable 24 is formed in accordance with the cross section "A" of figure 4. In cable portions 32 that are closer to the apparatus carrier 1 and the consumer installation 26, the feeding cable 24 is formed in accordance with the cross section "B" of figure 4.
In cross section A of the feeding cable 24, it is shown that the feeding cable 24 is provided with relatively light materials 36, for example in the form of a synthetic material such as polyvinyl chloride (PCV) . In cross section B, these areas have been replaced, at least partially, with a heavier material 38, for example in the form of metal, such as wire ropes. Otherwise the feeding cable 24 is constructed in a manner known per se with
conductors 40, optical fibre 42 and various PVC sheaths 44, all surrounded by an outer sheath 46.
By adjustment of the portion of relatively light materials 36 and heavier materials 38, the feeding cable will take a desired position in the sea, extending relatively straight down from the apparatus carrier 1 and the consumer
installation 26 to the desired depth at which the middle portion 32 is, in the main, at a constant height level.
Claims
1. A method for supplying electric power to one or more consumer installations (26) at sea, wherein the electric power is carried by means of a supply cable (22, 30) which extends to shore or to a sea-based distribution plant, cha r a c t e r i z ed i n that the method includes :
- arranging an apparatus carrier (1) near but
separately from the consumer installation (26) ;
- arranging an electrical apparatus (16) in the form of at least a transformer (20) or a converter (18) on the apparatus carrier (1) ;
- connecting the supply cable (20, 30) to the
apparatus (16) which is on the apparatus carrier (1) ; and
- connecting a feeding cable (24) between apparatus (16) located on the apparatus carrier (1) and a distribution plant (28) on the consumer installation (26) .
2. A device for supplying electric power to one or more consumer installations (26) at sea, wherein the electric power is carried by means of a supply cable (22, 30) which extends to shore or to a sea-based distribution plant, charact e ri z ed i n that an electrical apparatus (16) in the form of at least a transformer (20) or a converter (18) is placed on an apparatus carrier (1) which is arranged near but separately from the consumer installation (26) , and where the supply cable (22, 30) is connected to the apparatus (16) which is on the apparatus carrier (1) , and where a feeding cable (24) is connected between the apparatus (16) on the apparatus carrier (1) and a distribution plant (28) on the consumer installation (26).
3. The device in accordance with claim 2, c ha r a c t e r i z e d i n that the apparatus carrier (1) is
5 floating and is anchored.
4. The device in accordance with claim 2, c h a r a c t e r i z e d i n that the apparatus carrier (1) is placed on the seabed (12) and projects above the sea surface (8) . io
5. The device in accordance with claim 2, c h a r a c t e r i z e d i n that the feeding cable (24) is submerged between the consumer installation (26) and the apparatus carrier (1) .
6. The device in accordance with claim 5, c ha r a c - i5 t e r i z e d i n that the feeding cable (24) has different buoyancies along its longitudinal extent.
7. The device in accordance with claim 6, c h a r a c t e r i z e d i n that the feeding cable (24) has greater buoyancy at its middle portion (32) than at
20 its cable portions (34) located nearer to at least the consumer installation (26) or the apparatus carrier (1).
8. The device in accordance with claim 2, c h ar a c t e r i z e d i n that the feeding cable (24) is
25 placed on or in the seabed (12) between the consumer installation (26) and the apparatus carrier (1) .
9. Use of an apparatus carrier (1) which is near to but separate from a consumer installation (26) at sea for carrying apparatuses (16) for at least the transformation or conversion of wired electric power to the consumer installation (26) .
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NO20092866 | 2009-08-19 | ||
| NO20092866 | 2009-08-19 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2011021941A1 true WO2011021941A1 (en) | 2011-02-24 |
Family
ID=43607199
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/NO2010/000305 WO2011021941A1 (en) | 2009-08-19 | 2010-08-13 | Method and device for supply of electric power to an installation at sea |
Country Status (1)
| Country | Link |
|---|---|
| WO (1) | WO2011021941A1 (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2326758A (en) * | 1997-04-29 | 1998-12-30 | Kvaerner Oilfield Prod As | Weighted subsea control cable |
-
2010
- 2010-08-13 WO PCT/NO2010/000305 patent/WO2011021941A1/en active Application Filing
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2326758A (en) * | 1997-04-29 | 1998-12-30 | Kvaerner Oilfield Prod As | Weighted subsea control cable |
Non-Patent Citations (2)
| Title |
|---|
| "Elektrifisering av Norsk sokkel - Transmisjonssystemer fra land og distribusjon til plattformer, Dok.No.: UPS-200753-R01, Rev. 02, 2007.11.29", UNITEC POWER SYSTEMS, 29 November 2007 (2007-11-29), Retrieved from the Internet <URL:http://www.npd.no/Global/Norsk/3-Publikasjoner/Rapporter/PDF/GrunnlagsmaterialeKraftfraland/Unitech_rapport.pdf> [retrieved on 20100902] * |
| MARTINEZ DE ALEGRIA I. ET AL: "Transmission alternatives for offshore electrical power", RENEWABLE AND SUSTAINABLE ENERGY REVIEWS, vol. 13, 1 June 2009 (2009-06-01), NEW YORK, US, pages 1027 - 1038, XP026000876, doi:10.1016/j.rser.2008.03.009 * |
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