WO2001084689A1 - Distribution system for electrical power - Google Patents

Distribution system for electrical power Download PDF

Info

Publication number
WO2001084689A1
WO2001084689A1 PCT/NO2001/000181 NO0100181W WO0184689A1 WO 2001084689 A1 WO2001084689 A1 WO 2001084689A1 NO 0100181 W NO0100181 W NO 0100181W WO 0184689 A1 WO0184689 A1 WO 0184689A1
Authority
WO
WIPO (PCT)
Prior art keywords
power
arrangement according
rectifier
phase
distribution
Prior art date
Application number
PCT/NO2001/000181
Other languages
French (fr)
Inventor
Ole Johan Bjerknes
Roger HÅRVIK
Original Assignee
Aker Engineering 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 Aker Engineering As filed Critical Aker Engineering As
Priority to AU58948/01A priority Critical patent/AU5894801A/en
Publication of WO2001084689A1 publication Critical patent/WO2001084689A1/en

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
    • H02J1/00—Circuit arrangements for dc mains or dc distribution networks
    • H02J1/08—Three-wire systems; Systems having more than three wires
    • 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 rel.ate-s to an.--arrangement for DC power distribution in particular for use in subsea and offshore environment .
  • Power distribution systems are widely ' used e.g. in the offshore industry supplying several installation requiring high power input, but today there are no subsea power distribution network commercially available.
  • Present technology is based upon AC-solutions and AC-components .
  • the main inconvenience of the AC-solution is the limitation in the length of cable.
  • the length of the cable from e.g. platform topside or onshore connection is limited due to large capasitive charging currents in the cables. I ' the charging current is equal to the thermal current limit of the cable, it will not be possible to transfer any power.
  • the total length of cables in the network will decide the size of the charging currents.
  • Another problem connected to an AC- distribution network is the need of transformers, which are large and heavy components. Frequency converters are also often used for flow control and for keeping the operational cost low.
  • the object of the present invention is to provide an arrangement eliminating the drawbacks '" described above.
  • a specific object of the present invention is to provide an arrangement having less limitations concerning cable length of a distribution network.
  • a further object of the invention is to provide an arrangement without the need of several numbers of large transformers.
  • the present invention attempts to decrease the number, size and weight of all components in a power distribution network.
  • the mainland or local power grid interface consist of two three-core transformers. Each transformer is connected to a rectifier bridge. Cables or transmission lines will distribute the DC power. The use of cable could become the most common distribution channel. The channel is terminated to one or more locations where voltage source inverters generate AC voltage sources that can supply individual consumers or a power distribution system.
  • the drawings show the principals of a DC power distributioon system consisting two electrical poles: "+” and "-" with a neutral conductor tha may be earthed for insulation leve control.
  • Fig. 1 shows the overall principal electrical power system
  • Fig. 2 demonstrates an additional configuration of the power system
  • Fig. 3 reveals the circuit diagram comprising the power electronic components. Description of preferred embodiment
  • the system presented in Fig. 1 comprise of two three-core transformers (1) .
  • the primary windings of the two parallel transformers (2) can be shifted ⁇ 7.5 electrical degrees to make the two 12-pulse inverter bridges (3) act like 24- pulse rectifiers.
  • the DC power distribution system generates very small amounts of harmonic distortion into the local mainland grid. This is especially important if the power is supplied from a power grid with local generation as for an offshore oil & gas platform. This will limit the need for harmonic filters, which would increase cost, weight and need for space on the platform.
  • each three-core transformer (1) is connected to a rectifier bridge (3) .
  • the rectifiers work as classic three-phase diode bridge rectifiers, but they are recommended to be implemented with thyristors. Thyristors can operate as breakers that are able to isolate the distribution system from the supplying grid faster than a circuit breaker. They can also control the initial charging of the DC channel to reduce negative effects on internal components and the supplying grid.
  • the rectifier bridges are connected in series to increase the distribution voltage as shown i Fig. 3 (3) .
  • the point of serial connection between the two transformers and the rectifiers is resistance earthed to control the insulation voltage level in the channel for DC power distribution.
  • the distribution channel (4) distributing the DC power from the rectifier-bridge, is three-phase lines or cables connected to the positive phase (5), negative phase (6) and the resistance earthed neutral phase (7) of the rectifier bridges .
  • phase is being used in the meaning of electrical poles. In normal operation, the current mainly flows in the positive and negative phase of the distribution channel. If the circuit is not symmetrically loaded, the unsymmetrical part of the current flows in the "neutral" phase terminated to the resistance earthed serial connection point.
  • the faulted half of the distribution system can be shut down by the thyristors without influencing the other half. This makes the maximum available power decrease to half of rated value and the consumers connected to the faulted half will lose o their power.
  • the cables may be connected to the individual subsea modules by wet- mateable connectors (8).
  • Wet-mateable connectors are commercial available for 11 kV AC-voltage, but will in s short time be available for 36 kV. It is assumed that some of these connectors also can be used for DC-voltages after a de-rating.
  • Voltage Source Inverters (9) o generates AC voltage sources that can supply individual consumers (10) or an AC power distribution system.
  • the selected DC to AC inverter technology is a Voltage Source Inverter technology applying switching semiconductors like Insulate Gate Bipolar Transistors (IGBT) , Gate Turn Off 5 thyristors (GTO) , or Integrated Gate Commutated Thyristors (IGCT) . These semiconductors are well known in the industry, thus they are not described here.
  • the VSI generates Pulse-Width-Modulated AC voltage to an AC-motor or AC-power distribution system from the capacitor o supported DC link.
  • the IGBT technology is probably the most natural choice.
  • the VSI technology enables several consumers to be independently connected to the DC link. This again makes it easy to connect the power channels to several locations with multiple consumers.
  • Present 5 commercial available technology for DC to AC inverters is from 0 to 6 kV.
  • the DC links of two inverters are connected in series to make up one drive
  • One drive is connected between either the positive phase (5) and earth (7) or negative phase (6) and earth/neutral (7).
  • the squirrel-cage type AC-motors are built with a double set of electrical three-phase stator windings.
  • the two series connected inverters supply one of the two three-phase windings of the AC-motor each, see Figure 1 and Figure 3.
  • One single offshore installation can be supplied with DC power from shore and/or from another offshore installation.
  • Electrical DC power cables can connect several offshore installations, enabling them to buy and sell electrical power from each other.
  • the grid can be connected as a ring or semi-radial power system among the offshore installations for increased availability.
  • the grid can also have one or several connections to the mainland for the same reasons .
  • Subsea installations comprising pumps and compressors can be supplied with DC power from shore or from an offshore installation as shown in Figure 1.
  • the distribution channel can be connected to one template and continue to the next.
  • the DC power system can include connections to several templates .
  • One or several islands can be supplied with electrical power from shore. The arrangement of the inverters will be extra suitable with large individual consumers on the island.
  • Equation 1 shows the voltage multiplied with the standard conversion factor of 1.34 for conversion from AC-voltage to the equivalent DC voltage.
  • two series connected o VSDs are connected between each phase and earth of the distribution channel.
  • the voltage between the positive and negative phases is then approximately 32 kV. 5
  • a 300 mm 2 three-core subsea cable has a thermal current-limit of approximately. 675 A, which gives a maximum transferred power as given in equation 2.
  • the power system then gives a DC distribution voltage of approximately ⁇ 30 kV, which again gives a voltage between the positive and negative phases of 60 kV.
  • the maximum-transferred power will be as given in equation 4.
  • a total DC power of approximately 40 MVA can be transferred through one 300 mm 2 three-core cable or two 1X300/150 mm 2 coaxial power cables. For long distances this can contribute to large cost savings by minimizing the procurement costs and installation costs for the distribution cable (s).

Abstract

The present invention relates to an arrangement for DC power distribution. A preferred embodiment of the invention combines a 'three-phase' (three conductors) DC distribution channel (4) and two series connected Voltage Source Inverters (9), each pair supplying a consumer e.g. a two-winding electrical motor (10). The DC distribution channel may be supplied with electrical power through a AC-DC converter consisting two three-core transformers (1) each connected to a rectifier-bridge (3). This embodiment, as well as for other variations of the invention, increases the DC voltage and may achieve sufficient high voltage levels for use in power distribution. Thus, this kind of DC arrangement will be in preference to AC arrangements because of the significant limitation regarding length of cables of last mentioned arrangements, and because DC power distribution networks in less degree having the need of heavy components compared to comparable AC solutions.

Description

DISTRIBUTION SYSTEM f0β JELΞCTRICA POWER
Field of the invention
The present invention rel.ate-s to an.--arrangement for DC power distribution in particular for use in subsea and offshore environment .
Background of the invention
Power distribution systems are widely' used e.g. in the offshore industry supplying several installation requiring high power input, but today there are no subsea power distribution network commercially available. Present technology is based upon AC-solutions and AC-components . The main inconvenience of the AC-solution is the limitation in the length of cable. The length of the cable from e.g. platform topside or onshore connection is limited due to large capasitive charging currents in the cables. I ' the charging current is equal to the thermal current limit of the cable, it will not be possible to transfer any power. Also if there are many locations to be supplied, the total length of cables in the network will decide the size of the charging currents. Another problem connected to an AC- distribution network is the need of transformers, which are large and heavy components. Frequency converters are also often used for flow control and for keeping the operational cost low.
Summary of the invention
The object of the present invention is to provide an arrangement eliminating the drawbacks'" described above. A specific object of the present invention is to provide an arrangement having less limitations concerning cable length of a distribution network. A further object of the invention is to provide an arrangement without the need of several numbers of large transformers. Generally, the present invention attempts to decrease the number, size and weight of all components in a power distribution network.
As for the features characteristic of the invention, reference is made to the claims.
In a preferred embodiment of the arrangement the mainland or local power grid interface consist of two three-core transformers. Each transformer is connected to a rectifier bridge. Cables or transmission lines will distribute the DC power. The use of cable could become the most common distribution channel. The channel is terminated to one or more locations where voltage source inverters generate AC voltage sources that can supply individual consumers or a power distribution system.
Brief description of the drawings
In order that the invention may be more readily understood, the embodiment will in the following be described in detail with reference to the accompanying drawings.
The drawings show the principals of a DC power distributioon system consisting two electrical poles: "+" and "-" with a neutral conductor tha may be earthed for insulation leve control.
Fig. 1 shows the overall principal electrical power system,
Fig. 2 demonstrates an additional configuration of the power system, and
Fig. 3 reveals the circuit diagram comprising the power electronic components. Description of preferred embodiment
The system presented in Fig. 1 comprise of two three-core transformers (1) . The primary windings of the two parallel transformers (2) can be shifted ±7.5 electrical degrees to make the two 12-pulse inverter bridges (3) act like 24- pulse rectifiers. In this way the DC power distribution system generates very small amounts of harmonic distortion into the local mainland grid. This is especially important if the power is supplied from a power grid with local generation as for an offshore oil & gas platform. This will limit the need for harmonic filters, which would increase cost, weight and need for space on the platform.
Furthermore, each three-core transformer (1) is connected to a rectifier bridge (3) . The rectifiers work as classic three-phase diode bridge rectifiers, but they are recommended to be implemented with thyristors. Thyristors can operate as breakers that are able to isolate the distribution system from the supplying grid faster than a circuit breaker. They can also control the initial charging of the DC channel to reduce negative effects on internal components and the supplying grid. The rectifier bridges are connected in series to increase the distribution voltage as shown i Fig. 3 (3) . The point of serial connection between the two transformers and the rectifiers is resistance earthed to control the insulation voltage level in the channel for DC power distribution.
The distribution channel (4) , distributing the DC power from the rectifier-bridge, is three-phase lines or cables connected to the positive phase (5), negative phase (6) and the resistance earthed neutral phase (7) of the rectifier bridges . It should be noted that in this context and in the following, the expression "phase" is being used in the meaning of electrical poles. In normal operation, the current mainly flows in the positive and negative phase of the distribution channel. If the circuit is not symmetrically loaded, the unsymmetrical part of the current flows in the "neutral" phase terminated to the resistance earthed serial connection point. If a fault occurs in one of the rectifier bridges or in one of the cable-cores 5 connected to the positive- or negative phase, the faulted half of the distribution system can be shut down by the thyristors without influencing the other half. This makes the maximum available power decrease to half of rated value and the consumers connected to the faulted half will lose o their power.
In case of a subsea power distribution system, the cables may be connected to the individual subsea modules by wet- mateable connectors (8). Wet-mateable connectors are commercial available for 11 kV AC-voltage, but will in s short time be available for 36 kV. It is assumed that some of these connectors also can be used for DC-voltages after a de-rating.
Finally, the distribution channel is terminated to one or more locations, where Voltage Source Inverters (9) o generates AC voltage sources that can supply individual consumers (10) or an AC power distribution system. The selected DC to AC inverter technology is a Voltage Source Inverter technology applying switching semiconductors like Insulate Gate Bipolar Transistors (IGBT) , Gate Turn Off 5 thyristors (GTO) , or Integrated Gate Commutated Thyristors (IGCT) . These semiconductors are well known in the industry, thus they are not described here. The VSI generates Pulse-Width-Modulated AC voltage to an AC-motor or AC-power distribution system from the capacitor o supported DC link. The IGBT technology is probably the most natural choice. The VSI technology enables several consumers to be independently connected to the DC link. This again makes it easy to connect the power channels to several locations with multiple consumers. Present 5 commercial available technology for DC to AC inverters is from 0 to 6 kV. To make it possible to transfer DC-power at higher voltages, the DC links of two inverters are connected in series to make up one drive One drive is connected between either the positive phase (5) and earth (7) or negative phase (6) and earth/neutral (7).
To enable supply of large, individual consumers that require electrical motors, the squirrel-cage type AC-motors are built with a double set of electrical three-phase stator windings. The two series connected inverters supply one of the two three-phase windings of the AC-motor each, see Figure 1 and Figure 3.
There are several scenarios for the application of this technology solution. The most likely cases are maybe in the oil & gas industry as platform or sub-sea power supply.
Examples of applications :
a) One single offshore installation can be supplied with DC power from shore and/or from another offshore installation.
b) Electrical DC power cables can connect several offshore installations, enabling them to buy and sell electrical power from each other. The grid can be connected as a ring or semi-radial power system among the offshore installations for increased availability. The grid can also have one or several connections to the mainland for the same reasons .
c) Subsea installations comprising pumps and compressors can be supplied with DC power from shore or from an offshore installation as shown in Figure 1. The distribution channel can be connected to one template and continue to the next. The DC power system can include connections to several templates . d) One or several islands can be supplied with electrical power from shore. The arrangement of the inverters will be extra suitable with large individual consumers on the island.
5 There is no new individual component technology in the described technical solution. The total power distribution system is seen to be unique due to the series connected Voltage Source Inverters in combination with two- and three-winding electrical equipment and how this is applied o into a complete power distribution system. This system configuration is compatible with a higher DC power transmission voltage than the different components would be alone .
Present commercially available VSDs have a maximum output s voltage of 6 kV. Equation 1 shows the voltage multiplied with the standard conversion factor of 1.34 for conversion from AC-voltage to the equivalent DC voltage.
UDCVSD = βkVAC 1.34 « 8kVDC (1)
According to the described solution, two series connected o VSDs are connected between each phase and earth of the distribution channel. This makes the distribution voltage between the phases and earth tot be twice the UDC,VSD in equation 1, which becomes ±16.0 kV. The voltage between the positive and negative phases is then approximately 32 kV. 5 As an example, a 300 mm2 three-core subsea cable has a thermal current-limit of approximately. 675 A, which gives a maximum transferred power as given in equation 2.
SMax=32.kVDc 675A « 22MVA (2)
For future VSDs, an output voltage of 11 kV is both o feasible and practical, since a lot of standard electrical equipment is commercially available for this voltage level. With an approximately doubled VSD output voltage level compared to equation 1, the DC input voltage level for each VSD will also be doubled as given in equation 3.
UDCVSD = H Vac 1-34 « 15kVDC (3)
The power system then gives a DC distribution voltage of approximately ±30 kV, which again gives a voltage between the positive and negative phases of 60 kV. With the same cable as in equation 1 and 2, the maximum-transferred power will be as given in equation 4.
SMax=60kVDC 675A « 40MVA (4)
By applying 11 kV VSDs, a total DC power of approximately 40 MVA can be transferred through one 300 mm2 three-core cable or two 1X300/150 mm2 coaxial power cables. For long distances this can contribute to large cost savings by minimizing the procurement costs and installation costs for the distribution cable (s).
For supplying many consumers in a large grid, it can be cost-effective to apply a distribution cable larger than 300 mm2 and distribute even more power.

Claims

P a t e n t c l a i m s
1. Arrangement for power distribution between a primary AC power supply network to a number of consumers, c h a r a c t e r i z e d i n a transformer or a number of transformers in parallel, each connected to a rectifier bridge or a similar means, from which power is distributed through one or more DC power distribution channels, terminated to one or more consumers in parallel, where a number of inverters connected in series are supplying one single consumer.
2. Arrangement according to claim 1, c h a r a c t e r i z e d i n that the inverters are Voltage Source Inverters like Insulate Gate Bipolar Transistors (IGBT) , Gate Turn Off thyristors (GTO) , or Integrated Gate Commutated Thyristors (IGCT) .
3. Arrangement according to claim 1 or 2, c h a r a c t e r i z e d i n that the distribution channels each containing one positive and one negative phase and earth/neutral.
4. Arrangement according to claim 3, c h a r a c t e r i z e d i n that there are two DC to AC inverters connected in series, connected between the distribution channel's positive or negative phase and earth/neutral .
5. Arrangement according to one of the proceeding claims, c h a r a c t e r i z e d i n that the rectifier-bridge work as classic multi-phase diode-bridge rectifiers.
6. Arrangement according to claim 5, c h a r a c t e r i z e d i n that the rectifier-bridges are connected in series.
7. Arrangement according to claim 5 or 6, c h a r a c t e r i z e d i n that the primary windings of the transformers can be shifted ±7.5 electrical degrees.
8. Arrangement according to claim 5, 6, or 7, c h a r a c t e r i z e d i n that the neutral phase is resistance earthed.
9. Arrangement according to claim 6, 7 or 8, c h a r a c t e r i z e d i n that there are two three- core transformers, the rectifier-bridges is a classic three-phase diode-bridge rectifiers and the distribution channel is three-core cables or two coaxial power cables .
10. Arrangement according to one of the proceeding claims, c h a r a c t e r i z e d i n that the consumer is an AC- otor .
PCT/NO2001/000181 2000-04-28 2001-04-30 Distribution system for electrical power WO2001084689A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU58948/01A AU5894801A (en) 2000-04-28 2001-05-16 Distribution system for electrical power

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO20002284 2000-04-28
NO20002284A NO312080B1 (en) 2000-04-28 2000-04-28 Electric power distribution system

Publications (1)

Publication Number Publication Date
WO2001084689A1 true WO2001084689A1 (en) 2001-11-08

Family

ID=19911075

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NO2001/000181 WO2001084689A1 (en) 2000-04-28 2001-04-30 Distribution system for electrical power

Country Status (3)

Country Link
AU (1) AU5894801A (en)
NO (1) NO312080B1 (en)
WO (1) WO2001084689A1 (en)

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002037640A1 (en) * 2000-10-30 2002-05-10 Cooper Cameron Corporation Control and supply system
EP1389818A1 (en) * 2002-08-16 2004-02-18 Bombardier Transportation (Technology) GmbH Electrical power supply for a rail vehicle
EP2293407A1 (en) * 2009-09-08 2011-03-09 Converteam Technology Ltd Power transmission and distribution systems
EP2390460A2 (en) 2010-05-27 2011-11-30 Vetco Gray Controls Limited Extending the life of a compromised umbilical
WO2012038100A1 (en) * 2010-09-24 2012-03-29 Siemens Aktiengesellschaft Subsea dc transmission system
WO2012075416A1 (en) * 2010-12-02 2012-06-07 Lighthouse Energy Solutions, Llc Superconducting direct current transmission system
WO2012164029A3 (en) * 2011-06-01 2013-06-20 Total Sa Subsea electrical architectures
US8492927B2 (en) 2001-09-19 2013-07-23 Cameron International Corporation Universal power supply system
WO2014189675A2 (en) * 2013-05-24 2014-11-27 Eaton Corporation High voltage direct current transmission and distribution system
WO2015018418A1 (en) * 2013-08-09 2015-02-12 Vestas Wind Systems A/S Electricity transmission
EP2848762A1 (en) * 2013-09-11 2015-03-18 Alcatel Lucent Providing power to a subsea node
NO338399B1 (en) * 2014-11-10 2016-08-15 Vetco Gray Scandinavia As Installations for supplying electrical power to subsea low voltage loads
US9608431B2 (en) 2010-12-02 2017-03-28 Lighthouse Energy Solutions LLC System and method to interrupt a DC current in a high voltage circuit by use of an AC circuit breaker
RU2658675C1 (en) * 2016-12-29 2018-06-22 Юрий Леонидович Беньяш Method and three-wire dc power supply system (options)
US10236687B2 (en) 2015-04-16 2019-03-19 Vestas Wind Systems A/S Fault tolerant wind turbine converter system
US10298140B2 (en) 2015-04-16 2019-05-21 Vestas Wind Systems A/S Wind turbine converter control
RU2736579C1 (en) * 2020-07-14 2020-11-18 федеральное государственное бюджетное образовательное учреждение высшего образования «Санкт-Петербургский горный университет» Method of transmitting electricity with direct current through a multi-wire power line and a device for its implementation

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1984002807A1 (en) * 1983-01-14 1984-07-19 Ass Elect Ind Direct current cable protection system
US4941079A (en) * 1988-10-07 1990-07-10 The Royal Institution For The Advancement Of Learning Pulse width modulation power transmission system
EP0554804A1 (en) * 1992-01-30 1993-08-11 Hitachi, Ltd. Control equipment for high voltage direct current transmission system
EP0868002A1 (en) * 1997-03-24 1998-09-30 Asea Brown Boveri Ab A plant for transmitting electric power
US5901053A (en) * 1997-03-24 1999-05-04 Asea Brown Boveri Ab Plant for transmitting electric power to remote facilities which have an electric motor load

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1984002807A1 (en) * 1983-01-14 1984-07-19 Ass Elect Ind Direct current cable protection system
US4941079A (en) * 1988-10-07 1990-07-10 The Royal Institution For The Advancement Of Learning Pulse width modulation power transmission system
EP0554804A1 (en) * 1992-01-30 1993-08-11 Hitachi, Ltd. Control equipment for high voltage direct current transmission system
EP0868002A1 (en) * 1997-03-24 1998-09-30 Asea Brown Boveri Ab A plant for transmitting electric power
US5901053A (en) * 1997-03-24 1999-05-04 Asea Brown Boveri Ab Plant for transmitting electric power to remote facilities which have an electric motor load

Cited By (34)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002037640A1 (en) * 2000-10-30 2002-05-10 Cooper Cameron Corporation Control and supply system
US8492927B2 (en) 2001-09-19 2013-07-23 Cameron International Corporation Universal power supply system
EP1389818A1 (en) * 2002-08-16 2004-02-18 Bombardier Transportation (Technology) GmbH Electrical power supply for a rail vehicle
WO2011029566A1 (en) * 2009-09-08 2011-03-17 Converteam Technology Ltd Power transmission and distribution systems
US9030042B2 (en) 2009-09-08 2015-05-12 Ge Energy Power Conversion Technology Ltd. Power transmission and distribution systems
EP2293407A1 (en) * 2009-09-08 2011-03-09 Converteam Technology Ltd Power transmission and distribution systems
EP2390460A2 (en) 2010-05-27 2011-11-30 Vetco Gray Controls Limited Extending the life of a compromised umbilical
US9650886B2 (en) 2010-05-27 2017-05-16 Vetco Gray Controls Limited Extending the life of a compromised umbilical
GB2480652B (en) * 2010-05-27 2015-07-29 Ge Oil & Gas Uk Ltd Extending the life of a compromised umbilical
WO2012038100A1 (en) * 2010-09-24 2012-03-29 Siemens Aktiengesellschaft Subsea dc transmission system
WO2012075416A1 (en) * 2010-12-02 2012-06-07 Lighthouse Energy Solutions, Llc Superconducting direct current transmission system
US20120142537A1 (en) * 2010-12-02 2012-06-07 Lighthouse Energy Solutions LLC Superconducting direct current transmission system
US8774883B2 (en) 2010-12-02 2014-07-08 Lighthouse Energy Solutions LLC Superconducting direct current transmission system
US9608431B2 (en) 2010-12-02 2017-03-28 Lighthouse Energy Solutions LLC System and method to interrupt a DC current in a high voltage circuit by use of an AC circuit breaker
US9236167B2 (en) 2010-12-02 2016-01-12 Lighthouse Energy Solutions LLC Superconducting direct current transmission system
WO2012164029A3 (en) * 2011-06-01 2013-06-20 Total Sa Subsea electrical architectures
GB2508991B (en) * 2011-06-01 2016-06-29 Total Sa Subsea electrical architectures
NO346255B1 (en) * 2011-06-01 2022-05-16 Total Sa SUBSIDIARY INSTALLATION FOR POWER DISTRIBUTION FOR SUBSERVE EQUIPMENT
US9859805B2 (en) 2011-06-01 2018-01-02 Total Sa Subsea electrical architectures
GB2508991A (en) * 2011-06-01 2014-06-18 Total Sa Subsea electrical architectures
US9270119B2 (en) 2013-05-24 2016-02-23 Eaton Corporation High voltage direct current transmission and distribution system
WO2014189675A2 (en) * 2013-05-24 2014-11-27 Eaton Corporation High voltage direct current transmission and distribution system
WO2014189675A3 (en) * 2013-05-24 2015-01-22 Eaton Corporation High voltage direct current transmission and distribution system
US9673629B2 (en) 2013-05-24 2017-06-06 Eaton Corporation High voltage direct current transmission and distribution system
EP4160850A1 (en) * 2013-05-24 2023-04-05 Eaton Intelligent Power Limited High voltage direct current transmission and distribution system
WO2015018418A1 (en) * 2013-08-09 2015-02-12 Vestas Wind Systems A/S Electricity transmission
US10044186B2 (en) 2013-08-09 2018-08-07 Vestas Wind Systems A/S AC and DC electricity transmission using a multiple-core cable
WO2015036483A1 (en) * 2013-09-11 2015-03-19 Alcatel Lucent Providing power to a subsea node
EP2848762A1 (en) * 2013-09-11 2015-03-18 Alcatel Lucent Providing power to a subsea node
NO338399B1 (en) * 2014-11-10 2016-08-15 Vetco Gray Scandinavia As Installations for supplying electrical power to subsea low voltage loads
US10298140B2 (en) 2015-04-16 2019-05-21 Vestas Wind Systems A/S Wind turbine converter control
US10236687B2 (en) 2015-04-16 2019-03-19 Vestas Wind Systems A/S Fault tolerant wind turbine converter system
RU2658675C1 (en) * 2016-12-29 2018-06-22 Юрий Леонидович Беньяш Method and three-wire dc power supply system (options)
RU2736579C1 (en) * 2020-07-14 2020-11-18 федеральное государственное бюджетное образовательное учреждение высшего образования «Санкт-Петербургский горный университет» Method of transmitting electricity with direct current through a multi-wire power line and a device for its implementation

Also Published As

Publication number Publication date
NO20002284L (en) 2001-10-29
NO312080B1 (en) 2002-03-11
AU5894801A (en) 2001-11-12
NO20002284D0 (en) 2000-04-28

Similar Documents

Publication Publication Date Title
Baran et al. DC distribution for industrial systems: opportunities and challenges
Friedrich Modern HVDC PLUS application of VSC in modular multilevel converter topology
Arrillaga High voltage direct current transmission
US7633770B2 (en) Collection and transmission system
EP2678914B1 (en) System and method for power sharing front-end converters without communication link in a modular-stacked dc transmission system
Bahrman Overview of HVDC transmission
WO2001084689A1 (en) Distribution system for electrical power
US9520801B1 (en) Method and system for a gas tube switch-based voltage source high voltage direct current transmission system
US20110089873A1 (en) Power supply device
EP3026803A1 (en) Start-up of HVDC converters
US20220348096A1 (en) Systems, apparatus and methods for electric vehicle charging via a power conversion system
US9748857B2 (en) Method and system for a gas tube-based current source high voltage direct current transmission system
Manohar et al. Improved controls for LCC-VSC hybrid HVDC system
EP2621076A1 (en) Multicell AC/DC power converter with isolated DC/DC converter stages
Rashidi et al. Application of multi-port solid state transformers for microgrid-based distribution systems
Babu et al. Power upgrading of transmission line by combining AC–DC transmission
Oñederra et al. Overview of DC technology-Energy conversion
Escobar-Mejia et al. New power electronic interface combining DC transmission, a medium-frequency bus and an AC-AC converter to integrate deep-sea facilities with the AC grid
US6861825B2 (en) Hybrid AC/DC system for electric power transmission
Sano A concept of multi-circuit HVDC transmission system for selective fault clearing without DC circuit breakers
Zhou et al. Dual voltage DC generator for compact light-weight ship electrical systems
CN109391157B (en) Universal converter transformer for high-voltage direct-current transmission system
Tarakesh et al. Review On High Voltage Direct Current (Hvdc) Transmission System
Qi et al. Configuration Generation and Analysis of AC and DC Conceptual Designs of Shipboard Power Systems
Evans et al. Powering the way-a paper on ac link TM technology for 21st century HVDC transmission

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): AE AG AL AM AT AT AU AZ BA BB BG BR BY BZ CA CH CN CO CR CU CZ CZ DE DE DK DK DM DZ EE EE ES FI FI GB GD GE GH GM HR HU ID IL IN IS JP KE KG KP KR KZ LC LK LR LS LT LU LV MA MD MG MK MN MW MX MZ NO NZ PL PT RO RU SD SE SG SI SK SK SL TJ TM TR TT TZ UA UG US UZ VN YU ZA ZW

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): GH GM KE LS MW MZ SD SL SZ TZ UG ZW AM AZ BY KG KZ MD RU TJ TM AT BE CH CY DE DK ES FI FR GB GR IE IT LU MC NL PT SE TR BF BJ CF CG CI CM GA GN GW ML MR NE SN TD TG

121 Ep: the epo has been informed by wipo that ep was designated in this application
REG Reference to national code

Ref country code: DE

Ref legal event code: 8642

122 Ep: pct application non-entry in european phase
NENP Non-entry into the national phase

Ref country code: JP