WO2016075009A1 - Installation destinée à alimenter des charges sous-marines basse tension en puissance électrique - Google Patents

Installation destinée à alimenter des charges sous-marines basse tension en puissance électrique Download PDF

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Publication number
WO2016075009A1
WO2016075009A1 PCT/EP2015/075693 EP2015075693W WO2016075009A1 WO 2016075009 A1 WO2016075009 A1 WO 2016075009A1 EP 2015075693 W EP2015075693 W EP 2015075693W WO 2016075009 A1 WO2016075009 A1 WO 2016075009A1
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WO
WIPO (PCT)
Prior art keywords
voltage
medium
subsea
plant according
converter
Prior art date
Application number
PCT/EP2015/075693
Other languages
English (en)
Inventor
Xu YUAN
Svend Rocke
Gorm Sande
Original Assignee
Vetco Gray Scandinavia As
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Vetco Gray Scandinavia As filed Critical Vetco Gray Scandinavia As
Publication of WO2016075009A1 publication Critical patent/WO2016075009A1/fr

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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
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/34—Arrangements for transfer of electric power between networks of substantially different frequency
    • 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
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]

Definitions

  • the present invention relates to a plant for feeding electric power to a plurality of low voltage subsea loads ( ⁇ 1000 V; >50 A) distributed over a subsea field comprising a plurality of wells and/or installations which may be located in the range of meters to kilometers apart, said plant comprising an arrangement configured to be connected to a high or medium voltage power supply installation and configured to supply said loads with electric power.
  • Said high or medium voltage power supply installation may be of any conceivable type suitable to feed a said arrangement with high or medium voltage power, and this power supply installation may for example have a transformer connected to a subsea high or medium voltage cable from a power station on shore or from an existing platform located at sea in an offshore oil and/or gas field.
  • a said consumer of electric power may belong to different types of subsea electric motors, such as for driving impellers of subsea pumps.
  • the object of the present invention is to provide a plant for feeding electric power to a plurality of low voltage subsea loads of the type defined in the introduction being improved in at least some aspect with respect to such plants already known.
  • the invention provides a fully marinised subsea low power, medium voltage ring system placed for subsea infield distribution to multiple low voltage loads being distributed over a subsea field.
  • the marinisation of such a subsea ring system is expected to be much simpler than those to be used for high power transmission purposes.
  • a reasonable number of said stages may be stacked up and distributed according to the need of infield distances and loads for a particular subsea field.
  • “Lower voltage” as used for the voltage defined by each stage of said ring may also cover a voltage being higher than the low voltage to be the operation voltage of a said load but still considerably lower than said medium voltage shared by all said stages.
  • said second converters connected to a said stage to convert a said lower voltage into an even lower said low AC voltage.
  • said arrangement further comprises a primary converter configured to deliver said medium voltage on the output thereof and have the start and the end of said ring connected to this output.
  • This primary converter will then ensure that a well-defined medium voltage may be delivered to said ring made of a cable of a reasonable size.
  • said primary converter is configured to deliver a medium DC voltage on the output thereof
  • said stages on said ring are DC stages
  • said one or several second converters connected to each said stage comprises one or more inverters each configured to deliver a said low AC voltage, high current power on the output thereof.
  • Said DC stages distributed over the extension of said DC ring typically having a location adapted to a location of said low voltage, and the number of said inverters can be flexibly chosen based on the process need, i.e. the number of said low voltage subsea loads located in the vicinity of the DC stage.
  • said primary converter comprises a rectifier configured to receive a medium AC voltage on the input thereof, which means that a said high or medium voltage power supply installation may use a main subsea cable AC power supply connected to an onshore station if desired.
  • said primary converter is configured to deliver a medium AC voltage on the output thereof, and said ring is a medium voltage AC ring with a plurality of AC stages stacked in series over the extension of said ring.
  • Said primary converter may in another embodiment of the invention then be an AC/AC converter.
  • each AC stage comprises a said second converter comprising a rectifier module and one or more inverters connected to the output of said module and each configured to deliver a said low AC voltage power to be fed to a said load.
  • At least some of said stages of said ring have a said second converter comprising several inverters connected in parallel for each receiving a same low DC voltage, and these inverters are associated with a control unit for individual control thereof, such as with respect to frequency and/or magnitude of the low AC voltage delivered thereby.
  • each stage of the ring may take a voltage being as low as said low voltage to be delivered to said loads and a plurality of such loads may still be fed independently of each other by said stage.
  • This embodiment is preferred in the case of a desire to have many said stages distributed over the extension of a said ring covering a said subsea field.
  • At least some of said stages of said ring have a said second converter connected thereto comprising several inverters connected in series across said lower direct voltage delivered thereto, and these inverters are associated with a control unit for individual control thereof, such as with respect to frequency and/or magnitude, of a low AC voltage delivered by each inverter.
  • This embodiment is suitable in the case that the number of stages needed for said ring is lower, so that said lower voltage consumed by a said stage is higher than said low operation voltage of a said load, since the series connection of said inverters may then in spite of that take care of a provision of a desired low voltage to the individual said load.
  • said arrangement comprises a plurality of said primary converters with a said medium voltage ring connected to each such primary converter so that a high number of low voltage subsea loads which may be geographically distributed over a subsea field may by the arrangement of several such rings efficiently be reached by said rings only requiring short low AC voltage cables over short distances from a location in a close vicinity of the respective load.
  • the plant comprises a subsea main transformer configured to be connected to a main subsea high voltage AC power supply cable so as to transform the high voltage of said cable to a medium AC voltage and a subsea medium voltage switchgear connecting to said transformer and to said arrangement.
  • a subsea transformer may then connect said switchgear to a said subsea primary converter and be configured to deliver a medium AC voltage to a said primary converter.
  • said subsea transformer has at least three windings in the form of a primary winding connected to said switchgear and a secondary winding and a further winding for delivering medium AC voltage with a phase shift with respect to a medium AC voltage delivered by said secondary winding connected to the input of said primary converter.
  • a transformer may be a rectifier transformer having three windings, said phase shift is 30°, and said primary converter is configured to carry out a 12-pulse rectifier of a medium AC voltage supplied thereto by said rectifier transformer. This results in a generation of less harmonic distortion upon rectifying said medium AC voltage than in the case of a 6- pulse rectification, so that disturbances in said plant may be reduced and so may the size and cost for harmonic filters.
  • each said primary converter is connected to said subsea medium voltage switchgear through a separate said subsea transformer.
  • said arrangement is according to another embodiment of the invention configured to be connected to a high or medium DC voltage from a topside power station connected directly to the input of said primary converter, which constitutes a further possibility to form a said high or medium voltage power supply installation connecting to said arrangement of the plant.
  • Fig. 1 is a very simplified view schematically illustrating a plant for feeding electric power to a plurality of low voltage subsea loads according to a first embodiment of the invention
  • Fig. 2 is a view corresponding to that of Fig. 1 of a plant according to a second embodiment of the invention slightly modified with respect to the plant shown in Fig. 1, and
  • Fig. 3 is a view corresponding to that of Fig. 1 and 2 of a plant according to a third embodiment of the invention.
  • Fig. 1 illustrates a plant according to a first embodiment of the invention for feeding electric power to a plurality of low voltage subsea loads geographically distributed over a subsea field comprising a plurality of wells and/or installations which may typically be located in the range of meters to kilometers apart, and this plant comprises a subsea main transformer 1 configured to be connected to a main subsea high voltage AC power supply cable 2 delivering a high AC voltage with a fixed frequency, such as 16 2/3, 50 or 60 Hz, to the transformer 1 from a topside power station onshore or from an existing platform located at sea in an offshore oil and/or gas field.
  • a fixed frequency such as 16 2/3, 50 or 60 Hz
  • the transformer 1 is configured to transform the high voltage of said cable 2 to a medium AC voltage and deliver this to a subsea medium voltage switchgear 3 having a plurality of circuit breakers 4-6 each connecting the switchgear to a subsea rectifier transformer 7, 8 of which only two are shown in this figure for simplifying the illustration of the plant.
  • Each subsea rectifier transformer is a three-winding transformer with a primary winding 9 connected to the switchgear 3, a secondary winding 10 and a further winding 11 connected to the input of a primary converter 12 for delivering medium AC voltages with a phase shift of 30° thereto.
  • the primary converter 12 is a rectifier configured to carry out a 12-pulse rectifier of the medium AC voltage supplied thereto by the rectifying transformer for delivering a medium DC voltage on the output 13 thereof.
  • a medium voltage DC ring 14 located to cover considerable infield distances of said subsea field is connected to the output 13 of the primary converter 12 and runs therefrom over at least a part of said subsea field and back to the primary converter.
  • a plurality of DC stages 15 are stacked in series over the extension of the ring 14 for together match the medium DC voltage of this ring and each DC stage defining a lower voltage.
  • Said DC stage 15 is defined by a DC/DC converter 16 delivering a low DC voltage to a plurality of inverters 17 connected in parallel with each other so as to each receive the same low DC voltage on the output of the converter 16.
  • a control unit 18 is associated with the inverters 17 for individual control of these inverters, such as with respect to frequency and/or magnitude of the low AC voltage delivered by each such inverter to loads 19, such as motors driving impellers of subsea pumps, in which the frequency of that voltage may for instance be varied from 0 to 600 Hz.
  • the plant according to the invention may have a plurality of such medium voltage DC rings 14 arranged to locally provide subsea loads with a low voltage through the DC stages located close to said loads.
  • Fig. 2 illustrates a plant according to a second embodiment of the invention differing from that shown in Fig. 1 only by the fact that the DC stages 20 of this embodiment will each consume a voltage of a higher level than said low voltage to be delivered to said loads, so that for this sake the inverters 17 connected to the output of the DC/DC converter 16 of the DC stage 20 are connected in series across the output of this converter for each consuming a part of the direct voltage delivered on the output of the converter so as to on their output deliver a suitable low AC voltage to the respective said load 19.
  • Fig. 3 illustrates a plant according to a third embodiment of the invention having a main subsea transformer 31 connected to a main subsea high voltage AC power supply cable 32 and to a subsea medium voltage switchgear 33 with a plurality of circuit breakers 34-36 connecting to a subsea three-winding transformer 37 having an output connected to the input of a primary converter in the form of an AC/AC converter 38 configured to deliver a medium AC voltage on the output 39 thereof.
  • a subsea medium AC voltage ring 40 is connected to the output of the converter 38 and runs to and over at least a part of a said subsea field and back.
  • a plurality of AC stages 41 are stacked in series over the extension of the ring 40 for together consume the medium voltage thereof and each stage defining a low AC voltage.
  • Each AC stage 41 comprises a rectifier module 42 in the form of a rectifier configured to deliver a lower DC voltage on the output thereof.
  • a plurality of inverters 43 are connected in series across the output of the rectifier 42 similar to the embodiment shown in Fig. 2 so as to each through the control of a control unit 44 deliver a low AC voltage with a frequency and/or magnitude independent of the frequency and/or magnitude of the low AC voltage delivered by the other inverters for supplying a low voltage subsea load 45 with power.
  • Low voltage is here a voltage typically of ⁇ 1000 V, medium voltage typically 1000 V - 36 kV and high voltage typically >36 kV.
  • Current is here a current typically >10 A.
  • HVDC High Voltage Direct Current
  • said installations or clusters do not have to be located at mutual distances of kilometers, but could be as close as in the order of some meters apart.
  • the loads within a said stage of a said ring may typically have a distance of some cm to some tenths of meter to adjacent such loads.
  • the AC voltage may in some cases of subsea loads be >1000 V, e.g. the isolation class can be 7.2 kV or 12 kV.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Inverter Devices (AREA)

Abstract

L'invention concerne une installation permettant l'alimentation en puissance électrique d'une pluralité de charges sous-marines basse tension (19) réparties sur un champ sous-marin comprenant une pluralité de puits et/ou d'installations qui peuvent être espacés de plusieurs mètres à plusieurs kilomètres, et qui comprend au moins un segment de moyenne tension sous-marin (14) qui part en direction et au-dessus d'au moins une partie dudit champ et revient. Une pluralité d'étages (15) est empilée en série sur l'extension dudit segment pour ainsi en prendre la moyenne tension et chaque étage définissant une tension inférieure. Un ou plusieurs convertisseurs (16, 17) sont reliés à chacun desdits étages (15) pour convertir leur tension inférieure et obtenir un courant à faible tension CA qui doit alimenter ladite charge (19) à proximité immédiate dudit convertisseur (16, 17) respectif.
PCT/EP2015/075693 2014-11-10 2015-11-04 Installation destinée à alimenter des charges sous-marines basse tension en puissance électrique WO2016075009A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO20141347A NO338399B1 (no) 2014-11-10 2014-11-10 Anlegg for å levere elektrisk kraft til undersjøiske lavspenningslaster
NO20141347 2014-11-10

Publications (1)

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WO2016075009A1 true WO2016075009A1 (fr) 2016-05-19

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NO (1) NO338399B1 (fr)
WO (1) WO2016075009A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019236268A1 (fr) * 2018-06-05 2019-12-12 Saudi Arabian Oil Company Alimentation électrique pour équipement et opérations en mer

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2194638A2 (fr) * 2008-12-03 2010-06-09 General Electric Company Architectures de système d'alimentation sous-marin modulaire
EP2667498A2 (fr) * 2012-05-23 2013-11-27 General Electric Company Système de dérivation pour charge à distance

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Publication number Priority date Publication date Assignee Title
NO312080B1 (no) * 2000-04-28 2002-03-11 Aker Eng As Distribusjonssystem for elektrisk kraft
NO326936B1 (no) * 2005-11-11 2009-03-16 Norsk Hydro Produksjon As Undervann avbruddsikkert stromforsyningssystem
WO2008002226A1 (fr) * 2006-06-28 2008-01-03 Abb Technology Ltd. Convertisseur ccht modulaire
EP2824822B1 (fr) * 2013-07-09 2017-05-03 ABB Schweiz AG Système de transmission et de distribution d'énergie fournissant une pluralité de charges sous-marines

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2194638A2 (fr) * 2008-12-03 2010-06-09 General Electric Company Architectures de système d'alimentation sous-marin modulaire
EP2667498A2 (fr) * 2012-05-23 2013-11-27 General Electric Company Système de dérivation pour charge à distance

Non-Patent Citations (1)

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Title
HÅKON SKOFTELAND ET AL: "Ormen Lange Subsea Compression Pilot - Subsea Compression Station", 2009 OFFSHORE TECHNOLOGY CONFERENCE, 7 May 2009 (2009-05-07), Houston, Texas, USA, XP055261412 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019236268A1 (fr) * 2018-06-05 2019-12-12 Saudi Arabian Oil Company Alimentation électrique pour équipement et opérations en mer

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NO338399B1 (no) 2016-08-15
NO20141347A1 (no) 2016-05-11

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