WO2004042887A2 - Dc power system for marine vessels - Google Patents

Dc power system for marine vessels Download PDF

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Publication number
WO2004042887A2
WO2004042887A2 PCT/US2003/029515 US0329515W WO2004042887A2 WO 2004042887 A2 WO2004042887 A2 WO 2004042887A2 US 0329515 W US0329515 W US 0329515W WO 2004042887 A2 WO2004042887 A2 WO 2004042887A2
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WO
WIPO (PCT)
Prior art keywords
power
propulsion
coupled
distribution unit
rungs
Prior art date
Application number
PCT/US2003/029515
Other languages
French (fr)
Other versions
WO2004042887A3 (en
Inventor
William E. Cratty
Stephen A. Fairfax
Original Assignee
Sure Power Corporation
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 Sure Power Corporation filed Critical Sure Power Corporation
Priority to AU2003299537A priority Critical patent/AU2003299537A1/en
Publication of WO2004042887A2 publication Critical patent/WO2004042887A2/en
Publication of WO2004042887A3 publication Critical patent/WO2004042887A3/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H21/00—Use of propulsion power plant or units on vessels
    • B63H21/12—Use of propulsion power plant or units on vessels the vessels being motor-driven
    • B63H21/17—Use of propulsion power plant or units on vessels the vessels being motor-driven by electric motor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H23/00—Transmitting power from propulsion power plant to propulsive elements
    • B63H23/22—Transmitting power from propulsion power plant to propulsive elements with non-mechanical gearing
    • B63H23/24—Transmitting power from propulsion power plant to propulsive elements with non-mechanical gearing electric
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63J—AUXILIARIES ON VESSELS
    • B63J3/00—Driving of auxiliaries
    • B63J3/02—Driving of auxiliaries from propulsion power plant
    • 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
    • H02J1/06—Two-wire systems
    • 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
    • H02J1/00—Circuit arrangements for dc mains or dc distribution networks
    • H02J1/10—Parallel operation of dc sources
    • 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
    • H02J1/14—Balancing the load in a network
    • H02J1/16—Balancing the load in a network using dynamo-electric machines coupled to flywheels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63J—AUXILIARIES ON VESSELS
    • B63J3/00—Driving of auxiliaries
    • B63J2003/001—Driving of auxiliaries characterised by type of power supply, or power transmission, e.g. by using electric power or steam
    • B63J2003/002—Driving of auxiliaries characterised by type of power supply, or power transmission, e.g. by using electric power or steam by using electric power
    • 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
    • H02J2310/00—The network for supplying or distributing electric power characterised by its spatial reach or by the load
    • H02J2310/40—The network being an on-board power network, i.e. within a vehicle
    • H02J2310/42—The network being an on-board power network, i.e. within a vehicle for ships or vessels
    • 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
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02T90/40—Application of hydrogen technology to transportation, e.g. using fuel cells

Definitions

  • the invention relates to DC power systems and is related to U.S. patent application serial number 09/870,897, the entire contents of which are incorporated herein by reference, U.S. patent application serial number 10/186,768, the entire contents of which are incorporated herein by reference, U.S. patent application serial number 10/231,330, the entire contents of which are incorporated herein by reference and U.S. provisional patent application serial number 60/385,685, the entire contents of which are incorporated herein by reference.
  • the electric service on marine vessels typically comprises two or more diesel powered generators paralleled together on a common AC electric bus. While there is a great body of experience with conventional power plants in marine service, maintaining stability of an AC system is quite complex; all generators must remain in phase.
  • AC generator stability issues include hunting, maximum power - puUout angle, effects of faults, out-of-phase transfers, and load transients. For best effect, generating sources must be independent; AC generators in synchronization are not independent. Also, reactive AC, or the out-of-phase portion of the AC wave, does no useful work. Inherent to conventional marine power plants is the pervasiveness of reactive power that can reduce resulting voltage, heat equipment and wires, and waste energy.
  • An embodiment of the invention is a power system for a marine vessel including a plurality of power sources.
  • a propulsion power distribution unit is coupled to the plurality of primary power sources.
  • a plurality of propulsion devices are coupled to the propulsion power distribution unit.
  • a weaponry power distribution unit is coupled to the propulsion power distribution unit.
  • a plurality of directed energy weapons are coupled to the weaponry power distribution unit.
  • FIGS. 1 A and IB depict a power system in one embodiment of the invention.
  • FIGS 1A and IB depict a power system in an embodiment of the invention.
  • the power system provides high availability (24 x 7 x forever), computer grade electricity to land based mission critical business and industrial processes.
  • the system may be adapted for use on naval vessels to provide an electric infrastructure that greatly improves overall performance, reliability, and survivability.
  • the power system uses a redundant array of independent devices (“RAID”) architecture, to integrate multiple, independent, on-site power generators of any type (e.g., fuel cells, gas reciprocating engines, gas turbines, etc.), rotary power conditioners (motor generators), and flywheels by means of a water cooled DC link to create an ultra reliable, computer grade power system.
  • RAID redundant array of independent devices
  • the power system technology includes rectifier topology, failsafe controls, a DC disconnect capable of interrupting 6k amps without arcing, and a unique over voltage protection device.
  • the power system has no single point of failure and is extremely fault tolerant.
  • the science of probabilistic risk assessment (“PRA”) determines the number of redundant components in a specific installation. The design balances redundancy against the inherent problem of complexity to arrive at an optimal and simple system design.
  • primary power sources 20 generate AC power that feeds a propulsion power distribution unit.
  • Primary power sources 20 may be any known power source such as fuel cells, gas reciprocating engines, gas turbines, etc.
  • the propulsion power distribution unit includes two DC rails 22 and 24 coupled by rungs 26A, 26B and 26C. Each rung 26 is fed power by each of the primary power sources 20 through AC-DC converters 28.
  • the power system takes the AC output of each primary power source 20 into separate, independent rectifiers and changes the power to DC that supplies the dual rail, DC propulsion power distribution unit. Voltage on the DC link system is tightly controlled (e.g., to 550 volts).
  • Each rung 26 is coupled to a propulsion motor 30 which imparts motion to the vessel.
  • disconnects 32 straddle feeds in and out of the rung 26. This allows components or even an entire rung 26 to be isolated for service, upgrade, etc.
  • Using a DC propulsion power distribution unit eliminates the issues of paralleling AC outputs from multiple generating sources, takes away the possibility of single points of failure, and eliminates inter-dependencies among generation sources, negating the potential for cascade failures. Reverse power flow may be blocked by diodes; low voltage or phasing on one generating source cannot affect others.
  • DC propulsion power distribution unit allows independent control of real power from each source thereby eliminating reactive power issues at the generator.
  • the DC propulsion power distribution unit provides DC power to a weaponry power distribution unit.
  • the weaponry power distribution unit includes two DC rails 42 and 44 coupled by rungs 46A, 46B and 46C. Each rung 46 is fed power by one of rungs 26A-26C through DC-DC converters 48. Each rung 46 is coupled to directed energy weaponry 50. Within each rung 46, disconnects 52 straddle feeds in and out of the rung 46. This allows components or even an entire rung 46 to be isolated for service, upgrade, etc.
  • An energy storage device 54 such as a superconducting magnetic energy storage device, is coupled to each rung 46.
  • the DC propulsion power distribution unit is also connected to an auxiliary power distribution unit shown in Figure IB.
  • the auxiliary power distribution unit includes two DC rails 62 and 64 coupled by rungs 66A-66G.
  • Rung 26B is coupled to rung 66B through DC-DC converter 68A.
  • Rung 26A is coupled to rung 66D through DC-DC converter 68B.
  • Rung 26C is coupled to rung 66F through DC-DC converter
  • Each rung 66 also receives power from multiple auxiliary power sources 70 which generate AC power and are coupled to one or more rungs 66 though AC-DC converters 72.
  • Auxiliary power sources 70 may be any known power source (e.g., fuel cells, gas reciprocating engines, gas turbines, etc.).
  • AC loads 74 may be connected to each rung through DC-AC converters 76 (e.g., motor-generators).
  • DC- AC converter 76 output may be 480 VAC with the voltage tolerance parameters that IEEE Standard 446-1987 specifies for computer equipment.
  • the DC-AC converter 76 clears faults and handles inrush current demands from the loads.
  • the DC-AC converters 76 also supplies reactive power close to the load allowing the prime generating sources to operate at a high power factor.
  • Solid state variable speed drives may be used to convert the 550 VDC to 480 VAC for powering chillers, fans, and pumps.
  • DC loads 78 may be connected to each rung through DC-DC converters 80.
  • DC-DC converter 80 may be employed to buck the DC link voltage to 48 VDC at the point of use for telecom loads .
  • discomiects 82 straddle feeds in and out of the rung 66.
  • Ancillary power sources 84 e.g., flywheels, batteries
  • flywheels, batteries are coupled to one or more rungs 66 to stabilize system voltage and mitigate the effects of faults, generating source failures, and load transients.
  • the primary power sources 20 supply power to the 600 VDC auxiliary power distribution unit and the weapon power distribution unit.
  • the auxiliary power sources 70 would be brought on line so that all of the power from the primary power sources would be available to the main propulsion motors 30 and directed energy weaponry 50.
  • the energy storage device 54 supplies high intensity power bursts to the directed energy weapons 50, which could be high-energy microwave or laser based weapons. Energy storage device 54 may be charged using regenerative braking techniques. While in port, the primary power sources 20 are shut down and an appropriate number of auxiliary power sources 70 supply power requirements. The number of primary power sources 20 and auxiliary power sources 70 depends upon the redundancy needed to achieve the desired level of availability.
  • the power system of Figures 1 A and IB allow compact power sources such as rotary engines to be used for the auxiliary power sources 70.
  • the auxiliary power sources 70 as well as the primary power sources 20 may be disbursed strategically throughout the ship. This enhances survivability; power would be available to both parts even if the ship were to be cut completely in two.
  • the system can be configured so that the main propulsion motors 30 are powered from the auxiliary power distribution unit, albeit at a reduced power rating.
  • ship designers realize significant space and weight savings in a vessel's electric infrastructure while effecting a substantial improvement in reliability, availability, and survivability.
  • the power system does not subscribe to an "N+2" or similar simplistic redundancy criteria.
  • the power system is designed to meet specific availability and reliability requirements, and to eliminate single points of failure. Redundant units are added as required based on the PRA evaluation. Units that fail more frequently (e.g., engine generators) will require a larger degree of redundancy than more reliable components (e.g., motor generators).
  • Simplistic "N+l” or “2N" redundancy criteria typically spend far too much on some redundant systems while simultaneously providing too little redundancy for others. The result is a needlessly complex system that costs more, is difficult to operate and maintain, and as a result is more likely to fail.
  • redundancy is balanced against the inherent problem of complexity to arrive at a system design that meets system requirements at a minimum cost.
  • the quantitative approach to this area results in the user being able to make informed decisions about redundancy, spare parts inventory, operating tactics, service agreements, and staffing levels.
  • the propulsion power distribution units may be implemented using a superconducting DC bus operating at +/- 10 kV and up to 10 kA.
  • This bus is suitable for conveying power from multiple remote sources to the ship's drive systems and to the various directed energy weapons 50 and energy storage device 54.
  • the bus design includes cooling and thermal management systems. Emphasis may be placed on making the bus small, rugged, and requiring extremely little or no maintenance throughout its operating lifetime. Rectifiers and inverters employed in AC-DC converters, DC-AC converters and DC-DC converters in the power system may use SCR technology because of the technology's proven field reliability and extraordinary raggedness.
  • the power system may use water cooling to minimize module size and weight.
  • cryogenic cooling (typically with liquid nitrogen, to 77 degrees Kelvin) offers several potential advantages for DD(X) applications.
  • cryogenic cooling reduces resistive losses in copper components by a factor of six, resulting in improved efficiency at the high drive power levels, and/or substantially reduced footprint by virtue of greatly reduced electrical interconnect size.
  • cryocooling offers the potential of allowing the SCRs to handle extremely large momentary overloads, as the maximum junction temperature limits will remain unchanged at approximately 400 Kelvin.
  • junction temperature rise during an electrical fault or pulsed power operation is limited to at most 100 Kelvin.
  • cryogenic cooling the maximum junction temperature rise will exceed 300 Kelvin.
  • the SCR's ability to safely conduct such large overloads will allow the rectifiers to electronically control faults, continue to operate with some devices damaged or destroyed, while the good heat transfer characteristics of boiling liquid nitrogen permits a rapid recovery to normal operating temperatures.
  • cryocooling substantially reduces the difficulty of connecting hot power sources to a superconducting bus and superconducting motors.
  • Cryocooled rectifiers and motor drives operate between the room temperature equipment and the superconducting materials. Their large cold mass and relatively small conductor cross-sections (enabled by the 6x reduction in copper resistivity) greatly simplify the design of the transition to superconducting temperatures, and reduce consumption of precious liquid helium.
  • Disconnects 32, 52 and/or 82 may be implemented using cryogenically cooled arcless DC switches and circuit breakers.
  • the power system may include DC switches rated at 6 kA and capable of interrupting full rated current with no arc. This technology may be extended to cryogenic rectifiers and superconducting DC bus.

Abstract

An embodiment of the invention is a power system for a marine vessel including a plurality of power sources (20). A propulsion power distribution unit is coupled to the plurality of primary power sources (20). A plurality of propulsion devices (30) are coupled to the propulsion power distribution unit. A weaponry power distribution unit is coupled to the propulsion power distribution unit. A plurality of directed energy weapons (50) are coupled to the weaponry power distribution unit.

Description

DC POWER SYSTEM FOR MARINE VESSELS
BACKGROUND
The invention relates to DC power systems and is related to U.S. patent application serial number 09/870,897, the entire contents of which are incorporated herein by reference, U.S. patent application serial number 10/186,768, the entire contents of which are incorporated herein by reference, U.S. patent application serial number 10/231,330, the entire contents of which are incorporated herein by reference and U.S. provisional patent application serial number 60/385,685, the entire contents of which are incorporated herein by reference. The electric service on marine vessels typically comprises two or more diesel powered generators paralleled together on a common AC electric bus. While there is a great body of experience with conventional power plants in marine service, maintaining stability of an AC system is quite complex; all generators must remain in phase. AC generator stability issues include hunting, maximum power - puUout angle, effects of faults, out-of-phase transfers, and load transients. For best effect, generating sources must be independent; AC generators in synchronization are not independent. Also, reactive AC, or the out-of-phase portion of the AC wave, does no useful work. Inherent to conventional marine power plants is the pervasiveness of reactive power that can reduce resulting voltage, heat equipment and wires, and waste energy.
SUMMARY OF THE INVENTION
An embodiment of the invention is a power system for a marine vessel including a plurality of power sources. A propulsion power distribution unit is coupled to the plurality of primary power sources. A plurality of propulsion devices are coupled to the propulsion power distribution unit. A weaponry power distribution unit is coupled to the propulsion power distribution unit. A plurality of directed energy weapons are coupled to the weaponry power distribution unit.
BRIEF DESCRIPTION OF THE DRAWINGS Figures 1 A and IB depict a power system in one embodiment of the invention.
DETAILED DESCRIPTION
Figures 1A and IB depict a power system in an embodiment of the invention. The power system provides high availability (24 x 7 x forever), computer grade electricity to land based mission critical business and industrial processes. The system may be adapted for use on naval vessels to provide an electric infrastructure that greatly improves overall performance, reliability, and survivability.
The power system uses a redundant array of independent devices ("RAID") architecture, to integrate multiple, independent, on-site power generators of any type (e.g., fuel cells, gas reciprocating engines, gas turbines, etc.), rotary power conditioners (motor generators), and flywheels by means of a water cooled DC link to create an ultra reliable, computer grade power system. The power system technology includes rectifier topology, failsafe controls, a DC disconnect capable of interrupting 6k amps without arcing, and a unique over voltage protection device. The power system has no single point of failure and is extremely fault tolerant. The science of probabilistic risk assessment ("PRA") determines the number of redundant components in a specific installation. The design balances redundancy against the inherent problem of complexity to arrive at an optimal and simple system design.
Referring to Figure 1A, primary power sources 20 generate AC power that feeds a propulsion power distribution unit. Primary power sources 20 may be any known power source such as fuel cells, gas reciprocating engines, gas turbines, etc. The propulsion power distribution unit includes two DC rails 22 and 24 coupled by rungs 26A, 26B and 26C. Each rung 26 is fed power by each of the primary power sources 20 through AC-DC converters 28. The power system takes the AC output of each primary power source 20 into separate, independent rectifiers and changes the power to DC that supplies the dual rail, DC propulsion power distribution unit. Voltage on the DC link system is tightly controlled (e.g., to 550 volts). Each rung 26 is coupled to a propulsion motor 30 which imparts motion to the vessel. Within each rung 26, disconnects 32 straddle feeds in and out of the rung 26. This allows components or even an entire rung 26 to be isolated for service, upgrade, etc.
Using a DC propulsion power distribution unit eliminates the issues of paralleling AC outputs from multiple generating sources, takes away the possibility of single points of failure, and eliminates inter-dependencies among generation sources, negating the potential for cascade failures. Reverse power flow may be blocked by diodes; low voltage or phasing on one generating source cannot affect others. The
DC propulsion power distribution unit allows independent control of real power from each source thereby eliminating reactive power issues at the generator.
The DC propulsion power distribution unit provides DC power to a weaponry power distribution unit. The weaponry power distribution unit includes two DC rails 42 and 44 coupled by rungs 46A, 46B and 46C. Each rung 46 is fed power by one of rungs 26A-26C through DC-DC converters 48. Each rung 46 is coupled to directed energy weaponry 50. Within each rung 46, disconnects 52 straddle feeds in and out of the rung 46. This allows components or even an entire rung 46 to be isolated for service, upgrade, etc. An energy storage device 54, such as a superconducting magnetic energy storage device, is coupled to each rung 46.
The DC propulsion power distribution unit is also connected to an auxiliary power distribution unit shown in Figure IB. The auxiliary power distribution unit includes two DC rails 62 and 64 coupled by rungs 66A-66G. Rung 26B is coupled to rung 66B through DC-DC converter 68A. Rung 26A is coupled to rung 66D through DC-DC converter 68B. Rung 26C is coupled to rung 66F through DC-DC converter
68C. Each rung 66 also receives power from multiple auxiliary power sources 70 which generate AC power and are coupled to one or more rungs 66 though AC-DC converters 72. Auxiliary power sources 70 may be any known power source (e.g., fuel cells, gas reciprocating engines, gas turbines, etc.). AC loads 74 may be connected to each rung through DC-AC converters 76 (e.g., motor-generators). DC- AC converter 76 output may be 480 VAC with the voltage tolerance parameters that IEEE Standard 446-1987 specifies for computer equipment. The DC-AC converter 76 clears faults and handles inrush current demands from the loads. The DC-AC converters 76 also supplies reactive power close to the load allowing the prime generating sources to operate at a high power factor. Solid state variable speed drives may be used to convert the 550 VDC to 480 VAC for powering chillers, fans, and pumps.
DC loads 78 may be connected to each rung through DC-DC converters 80. DC-DC converter 80 may be employed to buck the DC link voltage to 48 VDC at the point of use for telecom loads .
Within each rung 66, discomiects 82 straddle feeds in and out of the rung 66.
This allows components or even an entire rung 66 to be isolated for service, upgrade, etc. Ancillary power sources 84 (e.g., flywheels, batteries) are coupled to one or more rungs 66 to stabilize system voltage and mitigate the effects of faults, generating source failures, and load transients.
Each load, whether DC or AC, is isolated from other system outputs by AC- DC converter or DC-DC converter. Therefore, an electrical event on one circuit cannot propagate to any other circuit.
While at sea in non-combat conditions, in addition to powering the main propulsion motors 30 via the 20 kVDC propulsion power distribution unit, the primary power sources 20 supply power to the 600 VDC auxiliary power distribution unit and the weapon power distribution unit. During battle conditions the auxiliary power sources 70 would be brought on line so that all of the power from the primary power sources would be available to the main propulsion motors 30 and directed energy weaponry 50.
The energy storage device 54 supplies high intensity power bursts to the directed energy weapons 50, which could be high-energy microwave or laser based weapons. Energy storage device 54 may be charged using regenerative braking techniques. While in port, the primary power sources 20 are shut down and an appropriate number of auxiliary power sources 70 supply power requirements. The number of primary power sources 20 and auxiliary power sources 70 depends upon the redundancy needed to achieve the desired level of availability.
The power system of Figures 1 A and IB allow compact power sources such as rotary engines to be used for the auxiliary power sources 70. The auxiliary power sources 70 as well as the primary power sources 20 may be disbursed strategically throughout the ship. This enhances survivability; power would be available to both parts even if the ship were to be cut completely in two. In an emergency, the system can be configured so that the main propulsion motors 30 are powered from the auxiliary power distribution unit, albeit at a reduced power rating. By using the DC systems described herein, ship designers realize significant space and weight savings in a vessel's electric infrastructure while effecting a substantial improvement in reliability, availability, and survivability.
The power system does not subscribe to an "N+2" or similar simplistic redundancy criteria. The power system is designed to meet specific availability and reliability requirements, and to eliminate single points of failure. Redundant units are added as required based on the PRA evaluation. Units that fail more frequently (e.g., engine generators) will require a larger degree of redundancy than more reliable components (e.g., motor generators). Simplistic "N+l" or "2N" redundancy criteria typically spend far too much on some redundant systems while simultaneously providing too little redundancy for others. The result is a needlessly complex system that costs more, is difficult to operate and maintain, and as a result is more likely to fail. In embodiments of the power system, redundancy is balanced against the inherent problem of complexity to arrive at a system design that meets system requirements at a minimum cost. The quantitative approach to this area results in the user being able to make informed decisions about redundancy, spare parts inventory, operating tactics, service agreements, and staffing levels.
The propulsion power distribution units may be implemented using a superconducting DC bus operating at +/- 10 kV and up to 10 kA. This bus is suitable for conveying power from multiple remote sources to the ship's drive systems and to the various directed energy weapons 50 and energy storage device 54. The bus design includes cooling and thermal management systems. Emphasis may be placed on making the bus small, rugged, and requiring extremely little or no maintenance throughout its operating lifetime. Rectifiers and inverters employed in AC-DC converters, DC-AC converters and DC-DC converters in the power system may use SCR technology because of the technology's proven field reliability and extraordinary raggedness. The power system may use water cooling to minimize module size and weight. Cryogenic cooling (typically with liquid nitrogen, to 77 degrees Kelvin) offers several potential advantages for DD(X) applications. First, cryogenic cooling reduces resistive losses in copper components by a factor of six, resulting in improved efficiency at the high drive power levels, and/or substantially reduced footprint by virtue of greatly reduced electrical interconnect size.
Second, cryocooling offers the potential of allowing the SCRs to handle extremely large momentary overloads, as the maximum junction temperature limits will remain unchanged at approximately 400 Kelvin. When cooled at or near room temperature, junction temperature rise during an electrical fault or pulsed power operation (for firing directed energy weapons 50) is limited to at most 100 Kelvin. With cryogenic cooling, the maximum junction temperature rise will exceed 300 Kelvin. The SCR's ability to safely conduct such large overloads will allow the rectifiers to electronically control faults, continue to operate with some devices damaged or destroyed, while the good heat transfer characteristics of boiling liquid nitrogen permits a rapid recovery to normal operating temperatures.
Third, cryocooling substantially reduces the difficulty of connecting hot power sources to a superconducting bus and superconducting motors. Cryocooled rectifiers and motor drives operate between the room temperature equipment and the superconducting materials. Their large cold mass and relatively small conductor cross-sections (enabled by the 6x reduction in copper resistivity) greatly simplify the design of the transition to superconducting temperatures, and reduce consumption of precious liquid helium. Disconnects 32, 52 and/or 82 may be implemented using cryogenically cooled arcless DC switches and circuit breakers. The power system may include DC switches rated at 6 kA and capable of interrupting full rated current with no arc. This technology may be extended to cryogenic rectifiers and superconducting DC bus. Existing switches have a size of 32"x24"xl8", approximately 1/10 the volume of conventional switches utilizing arc chutes. Cryogenic cooling could further reduce the size (although mechanical forces developed by large fault currents may limit the amount of reduction possible) and will certainly extend the maximum permissible fault current that the device can safely interrupt. While preferred embodiments have been shown and described, various modifications and substitutions may be made thereto without departing from the spirit and scope of the invention. Accordingly, it is to be understood that the present invention has been described by way of illustration and not limitation.
What is claimed is:

Claims

1. A power system for a marine vessel, the power system comprising: a plurality of primary power sources; a propulsion power distribution unit coupled to said plurality of primary power sources, a plurality of propulsion devices coupled to said propulsion power distribution unit, said propulsion devices imparting motion to said vessel; a weaponry power distribution unit coupled to said propulsion power distribution unit; a plurality of directed energy weapons coupled to said weaponry power distribution unit.
2. The power system of claim 1 wherein: said propulsion power distribution unit is a DC power distribution unit and includes two rails connected by a plurality of propulsion rungs.
3. The power system of claim 2 wherein: each of said primary power sources is coupled to one of said plurality of propulsion rungs.
4. The power system of claim 2 wherein: each of said primary power sources is coupled to each of said plurality of propulsion rungs through an AC-DC converter.
5. The power system of claim 2 wherein: each of said plurality of propulsion rungs is coupled to a respective propulsion device.
6. The power system of claim 2 wherein: said weapomy power distribution unit is a DC power distribution unit including two rails connected by a plurality of weaponry rungs.
7. The power system of claim 6 wherein: each of said propulsion rungs is coupled to one of said plurality of weaponry rungs.
8. The power system of claim 7 wherein: each of said propulsion rungs is coupled to one of said plurality of weaponry rungs through a DC-DC converter.
9. The power system of claim 6 wherein: each of said plurality of weaponry rungs is coupled to a respective directed energy weapon.
10. The power system of claim 2 further comprising: an auxiliary power distribution unit coupled to said propulsion power distribution unit.
11. The power system of claim 10 wherein: said auxiliary power distribution unit is a DC power distribution unit including two rails connected by a plurality of auxiliary rungs.
12. The power system of claim 11 wherein: each of said propulsion rungs is coupled to one of said plurality of auxiliary rungs.
13. The power system of claim 12 wherein: each of said propulsion rungs is coupled to one of said plurality of auxiliary rungs through a DC-DC converter.
14. The power system of claim 11 wherein: each of said plurality of auxiliary rungs is coupled to a respective auxiliary load.
15. The power system of claim 11 further comprising: an ancillary power source coupled to at least one of said auxiliary rungs.
16. The power system of claim 15 wherein: said ancillary power source is a flywheel.
PCT/US2003/029515 2002-09-18 2003-09-18 Dc power system for marine vessels WO2004042887A2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2003299537A AU2003299537A1 (en) 2002-09-18 2003-09-18 Dc power system for marine vessels

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1614621A2 (en) 2004-07-09 2006-01-11 ALSTOM Power Conversion GmbH Electric power supply system and operating method for the same
EP1914162A1 (en) * 2006-10-16 2008-04-23 Converteam Ltd DC power distribution system
CN105305406A (en) * 2014-07-11 2016-02-03 通用电气公司 DC power system for marine applications

Families Citing this family (55)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7406829B2 (en) * 2004-06-18 2008-08-05 General Electric Company Cryogenic liquid oxidizer cooled high energy system
US7190133B2 (en) * 2004-06-28 2007-03-13 General Electric Company Energy storage system and method for hybrid propulsion
US8098504B2 (en) * 2006-01-18 2012-01-17 Abb Technology Ltd. Converter station for connecting an AC system to an end of an HVDC transmission line
US8244419B2 (en) * 2006-10-24 2012-08-14 Mi-Jack Canada, Inc. Marine power train system and method of storing energy in a marine vehicle
US7936086B2 (en) * 2008-03-06 2011-05-03 Honeywell International, Inc. Paralleled HVDC bus electrical power system architecture
EP2218637B1 (en) * 2009-02-16 2012-04-18 Claus-D. Christophel Drive system for a ship
WO2012164029A2 (en) * 2011-06-01 2012-12-06 Total Sa Subsea electrical architectures
WO2012175624A1 (en) * 2011-06-22 2012-12-27 Wärtsilä Finland Oy Improvement in ship propulsion engine fuel efficiency
EP2634885B1 (en) * 2012-02-29 2015-09-02 ABB Technology Ltd A DC-power system with system protection capabilities
US10232332B2 (en) 2012-11-16 2019-03-19 U.S. Well Services, Inc. Independent control of auger and hopper assembly in electric blender system
US11959371B2 (en) 2012-11-16 2024-04-16 Us Well Services, Llc Suction and discharge lines for a dual hydraulic fracturing unit
US9840901B2 (en) 2012-11-16 2017-12-12 U.S. Well Services, LLC Remote monitoring for hydraulic fracturing equipment
US9650879B2 (en) 2012-11-16 2017-05-16 Us Well Services Llc Torsional coupling for electric hydraulic fracturing fluid pumps
US9995218B2 (en) 2012-11-16 2018-06-12 U.S. Well Services, LLC Turbine chilling for oil field power generation
US11476781B2 (en) 2012-11-16 2022-10-18 U.S. Well Services, LLC Wireline power supply during electric powered fracturing operations
US11449018B2 (en) * 2012-11-16 2022-09-20 U.S. Well Services, LLC System and method for parallel power and blackout protection for electric powered hydraulic fracturing
US9410410B2 (en) 2012-11-16 2016-08-09 Us Well Services Llc System for pumping hydraulic fracturing fluid using electric pumps
US9970278B2 (en) 2012-11-16 2018-05-15 U.S. Well Services, LLC System for centralized monitoring and control of electric powered hydraulic fracturing fleet
US10020711B2 (en) 2012-11-16 2018-07-10 U.S. Well Services, LLC System for fueling electric powered hydraulic fracturing equipment with multiple fuel sources
US10407990B2 (en) 2012-11-16 2019-09-10 U.S. Well Services, LLC Slide out pump stand for hydraulic fracturing equipment
US10254732B2 (en) 2012-11-16 2019-04-09 U.S. Well Services, Inc. Monitoring and control of proppant storage from a datavan
US10119381B2 (en) 2012-11-16 2018-11-06 U.S. Well Services, LLC System for reducing vibrations in a pressure pumping fleet
US10526882B2 (en) 2012-11-16 2020-01-07 U.S. Well Services, LLC Modular remote power generation and transmission for hydraulic fracturing system
US9745840B2 (en) 2012-11-16 2017-08-29 Us Well Services Llc Electric powered pump down
US10036238B2 (en) 2012-11-16 2018-07-31 U.S. Well Services, LLC Cable management of electric powered hydraulic fracturing pump unit
US9893500B2 (en) 2012-11-16 2018-02-13 U.S. Well Services, LLC Switchgear load sharing for oil field equipment
WO2015134622A2 (en) * 2014-03-05 2015-09-11 Huntington Ingalls Incorporated Method and system for breaker-less medium voltage dc architecture
CA2908276C (en) * 2014-10-14 2022-11-01 Us Well Services Llc Parallel power and blackout protection for electric hydraulic fracturing
EP3035477A1 (en) 2014-12-19 2016-06-22 ABB Technology Ltd A power system comprising a central energy storage system and a method of controlling power transfer in a power system
CN106300407B (en) * 2015-05-26 2020-03-17 通用电气公司 Power generation system
DK3416885T3 (en) * 2016-02-18 2022-08-01 Nat Oilwell Varco Norway As System for energy regeneration and distribution
US11181107B2 (en) 2016-12-02 2021-11-23 U.S. Well Services, LLC Constant voltage power distribution system for use with an electric hydraulic fracturing system
EP3407447A1 (en) * 2017-05-24 2018-11-28 Siemens Aktiengesellschaft Highly redundant direct current network
US10280724B2 (en) 2017-07-07 2019-05-07 U.S. Well Services, Inc. Hydraulic fracturing equipment with non-hydraulic power
WO2019071086A1 (en) 2017-10-05 2019-04-11 U.S. Well Services, LLC Instrumented fracturing slurry flow system and method
WO2019075475A1 (en) 2017-10-13 2019-04-18 U.S. Well Services, LLC Automatic fracturing system and method
US10655435B2 (en) 2017-10-25 2020-05-19 U.S. Well Services, LLC Smart fracturing system and method
US10598258B2 (en) 2017-12-05 2020-03-24 U.S. Well Services, LLC Multi-plunger pumps and associated drive systems
US10648311B2 (en) 2017-12-05 2020-05-12 U.S. Well Services, LLC High horsepower pumping configuration for an electric hydraulic fracturing system
CA3090408A1 (en) 2018-02-05 2019-08-08 U.S. Well Services, LLC Microgrid electrical load management
AR115054A1 (en) 2018-04-16 2020-11-25 U S Well Services Inc HYBRID HYDRAULIC FRACTURING FLEET
CA3103490A1 (en) * 2018-06-15 2019-12-19 U.S. Well Services, LLC Integrated mobile power unit for hydraulic fracturing
US10648270B2 (en) 2018-09-14 2020-05-12 U.S. Well Services, LLC Riser assist for wellsites
DE102018216766A1 (en) * 2018-09-28 2020-04-02 Siemens Aktiengesellschaft Power supply system for a water-bound facility
DE102018216785A1 (en) * 2018-09-28 2020-04-02 Siemens Aktiengesellschaft Power supply system for a water-bound facility
DE102018216753A1 (en) * 2018-09-28 2020-04-02 Siemens Aktiengesellschaft Power supply system for a water-bound facility
US11208878B2 (en) 2018-10-09 2021-12-28 U.S. Well Services, LLC Modular switchgear system and power distribution for electric oilfield equipment
DE102018219711A1 (en) * 2018-11-16 2020-05-20 Siemens Aktiengesellschaft Power supply system for a water-bound facility
CN109787212B (en) * 2019-01-01 2022-04-26 武汉船用电力推进装置研究所（中国船舶重工集团公司第七一二研究所） Method for automatically restarting ship direct current networking system in case of power failure
US11578577B2 (en) 2019-03-20 2023-02-14 U.S. Well Services, LLC Oversized switchgear trailer for electric hydraulic fracturing
WO2020231483A1 (en) 2019-05-13 2020-11-19 U.S. Well Services, LLC Encoderless vector control for vfd in hydraulic fracturing applications
CA3148987A1 (en) 2019-08-01 2021-02-04 U.S. Well Services, LLC High capacity power storage system for electric hydraulic fracturing
US11009162B1 (en) 2019-12-27 2021-05-18 U.S. Well Services, LLC System and method for integrated flow supply line
FI3985822T3 (en) * 2020-10-15 2023-12-19 Danfoss Editron Oy An electric power system
WO2022221432A1 (en) * 2021-04-15 2022-10-20 Spoc Automation Inc. Naturally load balanced redundant power conversion system

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4766393A (en) * 1985-10-28 1988-08-23 The Charles Stark Draper Laboratory, Inc. Limited diffraction feedback laser system
US5684690A (en) * 1996-08-16 1997-11-04 The United States Of America As Represented By The Secretary Of The Navy Integrated electrical power supply system for propulsion and service control

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4114555A (en) * 1977-03-14 1978-09-19 Brien Jr Harry W O Apparatus for and method of interconnecting and controlling units of a power train for maximum flexibility and economy in operating auxilliary marine vessels
US4661714A (en) * 1985-06-17 1987-04-28 Satterthwaite J Glenn Electric marine propulsion system
US5199912A (en) * 1991-08-15 1993-04-06 Newport News Shipbuilding And Dry Dock Company Electric power system for marine vehicles
DE19739917A1 (en) * 1997-09-11 1999-03-18 Siemens Ag System for supplying electromotive consumers with electrical energy
JP2003535563A (en) * 2000-05-31 2003-11-25 シュア パワー コーポレーション Power supply system using DC bus
US20030020330A1 (en) * 2001-07-12 2003-01-30 Cratty William E. DC ladder bus
US20030061829A1 (en) * 2001-08-29 2003-04-03 Rumsy Peter H. Heat recovery cooling system

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4766393A (en) * 1985-10-28 1988-08-23 The Charles Stark Draper Laboratory, Inc. Limited diffraction feedback laser system
US5684690A (en) * 1996-08-16 1997-11-04 The United States Of America As Represented By The Secretary Of The Navy Integrated electrical power supply system for propulsion and service control

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1614621A2 (en) 2004-07-09 2006-01-11 ALSTOM Power Conversion GmbH Electric power supply system and operating method for the same
EP1614621A3 (en) * 2004-07-09 2007-09-12 ALSTOM Power Conversion GmbH Electric power supply system and operating method for the same
EP1914162A1 (en) * 2006-10-16 2008-04-23 Converteam Ltd DC power distribution system
US7989977B2 (en) 2006-10-16 2011-08-02 Converteam Uk Ltd Power distribution systems
CN105305406A (en) * 2014-07-11 2016-02-03 通用电气公司 DC power system for marine applications
EP2966740A3 (en) * 2014-07-11 2016-08-03 General Electric Company Dc power system for marine applications
CN105305406B (en) * 2014-07-11 2019-08-06 通用电气公司 The DC electric power system of application waterborne

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