Power Supply System for an Electrical Drive of a Marine Vessel

• US 20130307444A1
• Filed: 01/19/2012
• Published: 11/21/2013
• Est. Priority Date: 02/01/2011
• Status: Active Grant

• Current Assignee: Siemens AG
• Original Assignee: Siemens AG
• Inventors: Settemsdal, Stig Olav
• Granted Patent: US 9,381,990 B2
• Time in Patent Office: Days
• US Class Current: 318/139
• CPC Class Codes: B60L 7/14 for vehicles propelled by ac motors
• CPC Class Codes: B60L 7/16 for vehicles comprising converters between the power source and the motor
• CPC Class Codes: B63H 21/17 by electric motor
• CPC Class Codes: B63H 23/24 electric dynamo-electric machines H02K
• CPC Class Codes: B63J 2003/002 by using electric power
• CPC Class Codes: B63J 2003/046 using wind or water driven turbines or impellers for power generation
• CPC Class Codes: B63J 3/02 from propulsion power plant
• CPC Class Codes: H02J 2310/42 for ships or vessels
• CPC Class Codes: H02J 3/322 the battery being on-board an electric or hybrid vehicle, e.g. vehicle to grid arrangements [V2G], power aggregation, use of the battery for network load balancing, coordinated or cooperative battery charging
• CPC Class Codes: H02J 4/00 Circuit arrangements for mains or distribution networks not specified as ac or dc
• CPC Class Codes: Y02E 60/00 Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
• CPC Class Codes: Y02T 70/00 Maritime or waterways transport
• CPC Class Codes: Y04S 10/126 the energy generation units being or involving electric vehicles [EV] or hybrid vehicles [HEV], i.e. power aggregation of EV or HEV, vehicle to grid arrangements [V2G]

Abstract

A power supply system for an electrical drive of a marine vessel is provided. The electrical drive includes an electric motor that is adapted to receive electric energy from a power source. The electrical drive has a first operating state in which electric energy is supplied by the power source to the electrical drive to operate the electrical drive and a second operating state in which the electric motor of the electrical drive is decelerated or braked, wherein the electrical drive generates electric energy in the second operating state. The power supply system comprises an electric energy storage device for storing generated electric energy.

Claims

1. A power supply system for an electrical drive of a marine vessel, wherein the electrical drive comprises an electric motor configured to receive electric energy from a power source, wherein the electrical drive has a first operating state in which electric energy is supplied by the power source to the electrical drive to operate the electrical drive and a second operating state in which the electric motor of the electrical drive is decelerating or braked, and wherein the electrical drive generates electric energy in the second operating state, the power supply system comprising:

an electric energy storage device that is electrically coupled to the electrical drive such that;

the electric energy storage device is charged by electric energy generated by the electrical drive in the second operating state; and

the electric energy storage device provides stored electric energy to the electrical drive for operating the electrical drive in the first operating state.

2. The power supply system according to claim 1, wherein the electric energy storage device is a battery or a capacitor bank.

3. The power supply system according to claim 1, wherein the electric energy storage device is a lithium polymer battery.

4. The power supply system according to claim 1, wherein the electric motor of the electrical drive is an AC motor, the electric energy storage device being connected to a DC bus of a variable frequency drive is connected between the power source and the AC motor of the electrical drive.

5. The power supply system according to claim 1, wherein the power source comprises a generator coupled to a gas turbine or a diesel engine.

6. The power supply system according to claim 1, wherein the coupling of the electric energy storage device to the electrical drive comprises a bi-directional step up or step down converter.

7. The power supply system according to claim 6, wherein the converter is a bi-directional step-up or step-down chopper.

8. The power supply system according to claim 1, wherein the electric energy storage device is coupled to an AC bus of the power supply system, the coupling comprising an inverter and rectifier for converting between an AC voltage on the AC bus and a DC voltage required by the electric energy storage device.

9. The power supply system according to claim 1, wherein the electrical drive of the marine vessel is the drive of a draw works of a drilling rig of the vessel, an anchor winch drive of the vessel, or a top drive of a drilling rig of the vessel.

10. The power supply system according to claim 1, wherein:

the electrical drive is a drive of an active heave compensating draw works of the marine vessel, and

the first operating state corresponds to a first part of a heave compensation cycle in which the electrical drive consumes electric energy and the second operating state corresponds to a second part of the heave compensation cycle in which the electrical drive generates electric energy, such that the electric energy storage device is periodically charged and discharged during the operation of the active heave compensation.

11. The power supply system according to claim 1, wherein:

the electric energy storage device is coupled to a DC bus of a frequency converter that is coupled between the power source and the electric motor of the electrical drive, and

the power supply system further comprises at least one of a second electric energy storage device coupled to the DC bus, at least a second power source coupled to the DC bus and a second electrical drive coupled to the DC bus.

12. The power supply system according to claim 1, wherein:

the electric energy storage device is coupled to a first section of a DC bus of a frequency converter that is coupled between the power source and the electric motor of the electrical drive, and

the power supply system further comprises at least a second electric energy storage device coupled to a second section of the DC bus, the second section of the DC bus further being coupled to a second power source and at least one second electrical drive,

wherein the first and second DC bus sections are connectable by a bus-tie breaker.

13. The power supply system according to claim 1, wherein:

the electric energy storage device is coupled to a DC bus of a frequency converter that is coupled between the power source and the electric motor of the electrical drive,

the DC bus is adapted to be operated in a voltage range of about 300V to about 2000V, and

the electrical drives has a power rating in the range of about 100 kW to about 30 MW.

14. A method of operating a power supply system for an electrical drive of a marine vessel, wherein the electrical drive comprises an electric motor that is adapted to receive electric energy from a power source, the power supply system comprising an electric energy storage device that is electrically coupled to the electrical drive, the method comprising:

in a first operating state of the electrical drive, supplying electric energy to the electrical drive for operating the electrical drive, the supplied electric energy comprising electric energy obtained from discharging the electric energy storage device, and

in a second operating state of the electrical drive, supplying electric energy generated by the electrical drive when braking or decelerating the electric motor of the electrical drive to the electric energy storage device, wherein the electric energy storage device is charged by the electric energy generated by the electrical drive.

15. The method according to claim 14, wherein the power supply system comprises an electric energy storage device electrically coupled to the electrical drive such that:

the electric energy storage device is charged by electric energy generated by the electrical drive in the second operating state; and

the electric energy storage device provides stored electric energy to the electrical drive for operating the electrical drive in the first operating state.

16. A system for a marine vessel, comprising:

an electrical drive of the marine vessel, the electrical drive comprising an electric motor configured to receive electric energy from a power source,

wherein the electrical drive has a first operating state in which electric energy is supplied by the power source to the electrical drive to operate the electrical drive and a second operating state in which the electric motor of the electrical drive is decelerating or braked, and wherein the electrical drive generates electric energy in the second operating state, and

a power supply system comprising an electric energy storage device electrically coupled to the electrical drive such that;

the electric energy storage device is charged by electric energy generated by the electrical drive in the second operating state; and

the electric energy storage device provides stored electric energy to the electrical drive for operating the electrical drive in the first operating state.