CN113991829A - Propeller power switching system - Google Patents

Abstract

The application provides a propeller power switching system is applied to dynamic positioning boats and ships, and boats and ships include: the power generation system comprises a first power generation unit and a second power generation unit which are respectively positioned in a first cabin and a second cabin, a first medium-voltage main distribution board and a first low-voltage main distribution board which are positioned between the first distribution boards, wherein the first medium-voltage main distribution board is connected with the first low-voltage main distribution board through a first feed switch, a second medium-voltage main distribution board and a second low-voltage main distribution board which are positioned between the second distribution boards, the second medium-voltage main distribution board is connected with the second low-voltage main distribution board through a second feed switch, a propeller local auxiliary distribution board which is positioned in a propeller cabin, and a propeller switching cabinet which is positioned in the propeller cabin, wherein the propeller switching cabinet is provided with a first change-over switch and a second change-over switch, the first change-over switch is connected with the first medium-voltage main distribution board, and the second change-over switch is connected with the second medium-voltage main distribution board. This application utilizes current equipment, switches the mode of panel when passing through the trouble simultaneously, has effectively improved boats and ships location ability.

Description

Propeller power switching system

Technical Field

The invention relates to the field of dynamic positioning ships, in particular to a power supply switching system of a propeller.

Background

The dynamic positioning system is widely applied to various engineering ships such as drilling ships, pipe laying ships, cable laying ships, platform support ships, diving support ships, wind power installation ships and the like due to the positioning capability of the dynamic positioning system under various water depths and sea conditions. The dynamic positioning vessel needs to maintain the positioning capability at the maximum single point of failure, which is generally referred to as failure of a movable part in DP2 and below, and for DP3 vessels, the definition is further extended to failure of any cabin on the vessel due to fire or water ingress.

Correspondingly, there are 2 design directions to improve the ship positioning ability: (1.) increase available power of propeller at single point of failure. The number of the propellers is increased or the single-machine power of the propellers is improved, and the number of the generators is increased or the power of the generators is improved to increase the total power of the ship power grid; (2.) optimize the overall arrangement of the ship, further decentralize the arrangement of the generator, the switchboard, the propeller and the auxiliary system equipment, separate by A60 fireproof and watertight bulkhead, form more redundant groups on the physical space, and when a single cabin is lost, the lost power of the power grid or the propeller is less. Whichever design direction, either greatly increases the cost of the project or increases the design difficulty from the ship design as a whole, is not the most preferred one in terms of both economic and technical feasibility.

Disclosure of Invention

In view of the above, the present invention provides a power switching system for a thruster, which can improve the positioning capability of a ship while reducing the cost.

In order to solve the technical problems, the invention adopts the following technical scheme:

the power supply switching system of the thruster is applied to a dynamic positioning ship, and the ship comprises:

separate first cabin, second cabin, first switch board, second switch board through fire prevention and watertight bulkhead, and the propeller cabin, propeller power switching system includes:

a first generator set and a second generator set which are respectively positioned in the first cabin and the second cabin,

a first medium voltage main distribution board and a first low voltage main distribution board which are arranged between the first distribution boards, the first medium voltage main distribution board is electrically connected with the first generator set, the first medium voltage main distribution board is connected with the first low voltage main distribution board through a first feed switch,

a second medium voltage main distribution board and a second low voltage main distribution board which are arranged between the second distribution boards, the second medium voltage main distribution board is electrically connected with the second generator set, the second medium voltage main distribution board is connected with the second low voltage main distribution board through a second feed switch,

a thruster local auxiliary switchboard located in the thruster compartment, the thruster local auxiliary switchboard being electrically connected with the first low voltage main switchboard and the second low voltage main switchboard, respectively, the thruster local auxiliary switchboard being for connection with a thruster auxiliary, and

the thruster switching cabinet is arranged in the thruster cabin and provided with a first switching switch and a second switching switch, the first switching switch is connected with the first medium-voltage main distribution board, and the second switching switch is connected with the second medium-voltage main distribution board.

In one embodiment of the application, the thruster well is separated into separate chambers by a fire-proof and watertight bulkhead, and the thruster switch cabinet and the thruster local auxiliary switchboard are provided in the thruster well.

In one embodiment of the present application, the switching system further includes:

and a third feeding switch disposed on the first medium voltage main distribution board, the first medium voltage main distribution board being connected to the first switching switch through the third feeding switch.

In one embodiment of the present application, the switching system further includes:

the fourth feed switch is arranged on the second medium-voltage distribution main board, and the second medium-voltage main distribution board is connected with the second change-over switch through the fourth feed switch;

the first change-over switch and the second change-over switch are mutually interlocked, so that the first change-over switch and the second change-over switch can only be switched on one at any time.

In one embodiment of the present application, the switching system further includes:

the first transformer is arranged in the first distribution board, and the first medium-voltage main distribution board is connected to the first transformer through a first feed switch;

first inlet wire switch, first inlet wire switch set up on first low pressure main distribution board, and first transformer is connected with first low pressure main distribution board through first inlet wire switch.

In one embodiment of the present application, the switching system further includes:

the second transformer is arranged in the second distribution board, and the second medium-voltage main distribution board is connected to the second transformer through a second feed switch;

and the second incoming switch is arranged on the second low-voltage main distribution board, and the second transformer is connected with the second low-voltage main distribution board through the second incoming switch.

In one embodiment of the present application, the switching system further includes:

the fifth feeding switch is arranged on the first low-voltage main distribution board;

and the third incoming switch is arranged on the local auxiliary power distribution board of the thruster and is connected with the fifth feed switch.

In one embodiment of the present application, the switching system further includes:

the sixth feeding switch is arranged on the second low-voltage main distribution board;

the fourth inlet switch is arranged on the local auxiliary power distribution board of the propeller and is connected with the sixth feed switch;

the third incoming line switch and the fourth incoming line switch are mutually interlocked, so that only one third incoming line switch and only one fourth incoming line switch can be switched on at any time.

In one embodiment of the present application, the switching system further includes:

the propulsion motor is arranged in the propeller cabin and used for driving the ship;

the propelling frequency converter is arranged in the propeller cabin and is connected with the propelling motor;

and the propelling transformer is arranged in the propeller cabin, is connected with the propelling frequency converter and is respectively connected with the first change-over switch and the second change-over switch.

The application also provides a dynamic positioning ship, which comprises the power supply switching system of the propeller.

The technical scheme of the invention at least has one of the following beneficial effects:

1. according to the power supply switching system of the propeller, the failure switching of the power supply of the propeller is realized by adding the propeller switching cabinet, the original equipment is fully utilized, and the transformation cost is reduced;

2. according to the power supply switching system of the propeller, the propeller switching cabinet is used, the switch is triggered and switched to the redundant distribution board only when the propeller system is normal and the medium-voltage main distribution board fails, then the feed switch of the redundant distribution board can be switched on and supplies power to the propeller, and therefore the extension and diffusion of the faults between the two medium-voltage distribution boards are effectively prevented;

3. the power supply switching system of the propeller keeps the number and power of the original generator sets unchanged, but improves the number of available propellers during single-point failure and effectively improves the positioning capacity of the ship.

Drawings

Fig. 1 is a schematic structural diagram of a propeller power switching system according to an embodiment of the present invention;

FIG. 2 is a control flow diagram of a propeller power switching system according to an embodiment of the present invention;

fig. 3 is a schematic diagram of a thruster switch cabinet signal of the thruster power supply switching system according to the embodiment of the present invention;

reference numerals: 1. a first generator; 2. a second generator; 3. a third generator; 4. a fourth generator; 5. a fifth generator; 6. a sixth generator; 7. a first medium voltage main switchboard; 8. a second medium voltage main switchboard; 9. a third feed switch; 10. a fourth feed switch; 11. a thruster switch cabinet; 12. a first changeover switch; 13. a second changeover switch; 14. a propulsion transformer; 15. a propulsion frequency converter; 16. a propulsion motor; 17. a first feed switch; 18. a second feed switch; 19. a first transformer; 20. a second transformer; 21. a first inlet switch; 22. a second incoming line switch; 23. a fifth feed switch; 24. a sixth feed switch; 25. a first low voltage main switchboard; 26. a second low voltage main switchboard; 27. a thruster local auxiliary switchboard; 28. a third incoming switch; 29. a fourth incoming line switch; 30. a propeller assist device; 31. a first nacelle; 32. a second nacelle; 33. a first distribution board; 34. a second distribution board; 35. A propeller capsule.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the drawings of the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention, are within the scope of the invention.

Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. The use of "first," "second," and similar terms in the present application do not denote any order, quantity, or importance, but rather the terms are used to distinguish one element from another. Also, the use of the terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object to be described is changed, the relative positional relationships are changed accordingly.

In the existing dynamic positioning ship scheme, the available power of a propeller is increased when a single point of failure occurs, or a generator, a distribution board, the propeller and auxiliary system equipment thereof are distributed. The first scheme needs to adopt a propeller with higher upper limit of power, so that the cost required by upgrading is increased; while the second requires either designing a new vessel layout scheme or an overall optimization of the existing vessel inlet lines to create more redundant groupings in physical space. The two schemes greatly increase the cost of the project and also increase the design difficulty of the ship design as a whole.

A propeller power switching system according to an embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

Referring to fig. 1, an embodiment of the present invention provides a power switching system for a thruster, which is applied to a dynamic positioning ship, and the ship includes: the first cabin 31, the second cabin 32, the first switchboard 33, the second switchboard 34, and the propeller cabin 35 are separated by fireproof and watertight bulkheads, and the propeller power switching system includes:

a first generator set consisting of a first generator 1, a second generator 2 and a third generator 3 positioned in the first cabin 31, a second generator set consisting of a fourth generator 4, a fifth generator 5 and a sixth generator 6 positioned in the second cabin 32, a first medium voltage main distribution board 7 and a first low voltage main distribution board 25 positioned between the first distribution boards 33. The first medium voltage main switchboard 7 is electrically connected with the first generator set, the first medium voltage main switchboard 7 is used for providing power to the thruster, the first medium voltage main switchboard 7 is connected with the first low voltage main switchboard 25 through the first feeding switch 17, and the first low voltage main switchboard 25 is used for providing auxiliary power to the thruster. A second medium voltage main switchboard 8 and a second low voltage main switchboard 26 located between the second switchboards 34, the second medium voltage main switchboard 8 being electrically connected to the second power generating set, the second medium voltage main switchboard 8 being adapted to provide power to the thruster, the second medium voltage main switchboard 8 being connected to the second low voltage main switchboard 26 via the second feeding switch 18, the second low voltage main switchboard 26 being adapted to provide auxiliary power to the thruster. A thruster local auxiliary switchboard 27 located at the thruster well 35, the thruster local auxiliary switchboard 27 being adapted to be connected with the thruster auxiliary equipment 30. The propeller compartment 35 further comprises: the thruster switch cabinet 11 is arranged in the thruster compartment 35, the thruster switch cabinet 11 is provided with a first switch 12 and a second switch 13, the first switch 12 is connected with the first medium voltage main distribution board 7, and the second switch 13 is connected with the second medium voltage main distribution board 8. The thruster switching cabinet 11 is connected to the first medium-voltage main distribution board 7 and the second medium-voltage main distribution board 8 respectively, when the distribution boards in any cabin fail, the thruster can be automatically switched to another medium-voltage main distribution board through the thruster switching cabinet 11 to continue to operate, and the thruster auxiliary power supply can also be directly switched to another low-voltage main distribution board. Therefore, the availability of the propeller can be ensured, the positioning capability of the ship is improved, the existing equipment of the ship is fully utilized, and the manufacturing cost is effectively saved.

Referring to fig. 1, in one embodiment of the present application, the propeller compartment 35 is separated into separate compartments by fire and water tight compartment walls, and the propeller switching cabinet 11 and the propeller local auxiliary power board 27 are provided in the propeller compartment. Particularly, the A60 fireproof and watertight bulkhead can be used for separating the propeller cabin 35, when the propeller cabin 35 fails due to fire or water leakage, other propellers and a whole-ship dynamic positioning system cannot be influenced, and the ship positioning capacity is guaranteed while the safety of the ship is improved.

Referring to fig. 1, in one embodiment of the present application, the first cabin 31 and the second cabin 32 are separated by an a60 fire-proof and watertight bulkhead; the first panel 33 is separated from the second panel 34 by a fire-proof and watertight bulkhead a 60. Therefore, the first cabin 31 and the second cabin 32, and the first distribution board 33 and the second distribution board 34 form two independent and unaffected power positioning subareas, and a precondition is created for automatically switching and maintaining the operation of the propeller by using the propeller switching cabinet 11.

Referring to fig. 1, in one embodiment of the present application, the first medium voltage main distribution board 7 includes: a third feeding switch 9, the first medium voltage main switchboard 7 is connected with the first switching switch 12 through the third feeding switch 9. A fourth feeding switch 10, through which the second medium voltage main switchboard 8 is connected with the second diverter switch 13; the first change-over switch 12 and the second change-over switch 13 are electrically interlocked with each other, so that only one of the first change-over switch 12 and the second change-over switch 13 can be switched on at any time. For example, when the first switch 12 is closed, the first medium voltage main switchboard 7 provides power to the thruster, and when the first medium voltage main switchboard 7 fails, the first switch 12 is opened, the second switch 13 is closed, and the second medium voltage main switchboard 8 provides power to the thruster. Therefore, the ship positioning capacity can be effectively improved when a single point of failure occurs.

Referring to fig. 1, in an embodiment of the present application, the system further includes: a first transformer 19, a first incoming line switch 21, a second transformer 20 and a second incoming line switch 22. Wherein, the first transformer 19 is a low-voltage power supply transformer, the first transformer 19 is arranged in the first distribution board 33 and is connected to the first transformer 19 through the first feed switch 17; the first inlet switch 21 is arranged on the first low voltage main switchboard 25, and the first transformer 19 is connected with the first low voltage main switchboard 25 through the first inlet switch 21. The second transformer 20 is a low voltage supply transformer, the second transformer 20 is arranged in a second switchboard 34, the second medium voltage main switchboard 8 is connected to the second transformer 20 through a second feeding switch 18; the second inlet switch 22 is disposed on the second low voltage main distribution board 26, and the second transformer 20 is connected to the second low voltage main distribution board 26 through the second inlet switch 22. The current transmitted by the medium voltage main switchboard may be stepped down using the low voltage supply transformer so that the first low voltage main switchboard 25 and the second low voltage main switchboard 26 provide power to the devices in the thruster well 35.

Referring to fig. 1, in an embodiment of the present application, the system further includes: a fifth feeding switch 23, a third incoming switch 28, a sixth feeding switch 24 and a fourth incoming switch 29. Wherein the fifth feeding switch 23 is provided on the first low voltage main switchboard 25; the third feeding switch 28 is provided on the pusher local auxiliary switchboard 27 and is connected with the fifth feeding switch 23. The sixth feeding switch 24 is provided on the second low-voltage main distribution board 26; a fourth incoming switch 29 is provided on the thruster local auxiliary switchboard 27 and is connected to the sixth feeding switch 24; the third incoming line switch 28 and the fourth incoming line switch 29 are electrically interlocked with each other, so that only one of the third incoming line switch 28 and the fourth incoming line switch 29 can be switched on at any time. For example, when the fifth feeding switch 23 is turned on, the first low voltage main distribution board 25 supplies power to the devices in the thruster well 35, and when the first low voltage main distribution board 25 fails, the fifth feeding switch 23 is turned off, the sixth feeding switch 24 is turned on, and the second low voltage main distribution board 26 supplies power to the devices in the thruster well 35. Therefore, the ship positioning capacity can be effectively improved when a single point of failure occurs.

Referring to fig. 1, in an embodiment of the present application, the system further includes: a propulsion motor 16, a propulsion frequency converter 15 and a propulsion transformer 14 arranged in the propulsion cabin 35. Wherein the propulsion motor 16 is used to drive the vessel; the propulsion frequency converter 15 is connected with a propulsion motor 16; the propulsion transformer 14 is connected to the propulsion inverter 15, and is connected to the first changeover switch 12 and the second changeover switch 13, respectively. For example, when an accident occurs when the first medium voltage main distribution board 7 supplies power to the propeller, the first switch 12 is opened, the second switch 13 is closed, a certain switching time is required for the switching process of supplying power to the propeller by the second medium voltage main distribution board 8, and the propulsion frequency converter 15 can use kinetic energy buffering and voltage maintaining capability to ensure that the propeller is maintained on line during the switching process. Therefore, the position maintaining capability of the ship can be effectively ensured.

The present application also provides a dynamic positioning vessel, characterized in that it comprises a thruster power supply switching system according to any one of claims 1-9. In the following, a specific use of the dynamic positioning vessel using the propeller power switching system of the present invention is exemplarily described.

First, as shown in fig. 1, 2, and 3, the third feed switch 9 connecting the first medium-voltage main distribution board 7 and the first switch 12 and the fourth feed switch 10 connecting the second medium-voltage main distribution board 8 and the second switch 13 control switching on and off by the propulsion converter 15, the first switch 12 and the second switch 13 in the thruster switch cabinet 11 control switching on and off by the ship propulsion control system, and the third feed switch 9 and the first switch 12 are switched on by default to supply power to the thruster. The ship propulsion control system can monitor the judgment signals of power loss of three busbars, namely voltage, frequency and power loss state signals on each busbar segment of the first medium-voltage main distribution board 7 and the second medium-voltage main distribution board 8 in real time, when two or more judgment signals are separated from a normal range, a power loss fault is triggered, the ship propulsion control system triggers and sends out a power loss fault signal, and whether the third feed switch 9 is tripped or not is monitored. When the tripping signal is received, the ship propulsion control system sends a switching-off command to the first switch 12, and the propulsion transformer 14, the propulsion frequency converter 15, the propulsion motor 16 and the machine busbar of the failed first medium-voltage main distribution board 7 are isolated, so that the failure is prevented from extending to the propeller; after receiving the opening state signal of the first change-over switch 12 of the thruster switch cabinet 11, the ship propulsion control system judges whether the fourth feed switch 10 of the second medium-voltage main distribution board 8 is in the opening state, and if so, a closing command is sent to the second change-over switch 13, so that the thruster switch cabinet 11 is ready to receive power supply from the second medium-voltage main distribution board 8 to the thruster continuously.

In addition, the propulsion frequency converter 15 monitors the incoming line power voltage and the internal dc bus voltage, when the voltage drops to the lower limit of the normal range after the first medium voltage main distribution board 7 loses power, the propulsion frequency converter 15 can automatically enter a kinetic energy buffer (KIB) and a Blackout Restart mode (Blackout Restart) to maintain the dc bus voltage to the maximum, at this time, the propulsion frequency converter 15 can reversely charge the capacitor of the propulsion frequency converter 15 by the rotational energy of the propulsion motor 16 to maintain the dc bus voltage as long as possible. During the period, the dynamic positioning system receives a switching signal of the ship propulsion control system, and at the moment, the dynamic positioning system stops sending a command to the propulsion frequency converter 15; when the switching operation of the thruster switch cabinet 11 is completed, the thruster frequency converter 15 may receive a signal to be commanded from the fourth feeding switch 10 on the second medium voltage main distribution board 8 and send a switch-on command signal to the fourth feeding switch 10. After the fourth feeding switch 10 is switched on, the power supply is recovered to normal, the propulsion frequency converter 15 receives a switch-on state signal of the fourth feeding switch 10, exits from the kinetic energy buffering and power failure restarting mode and sends an operation signal to the dynamic positioning system, and the dynamic positioning system recovers control over the propulsion frequency converter 15 after receiving the signal.

More specifically, the switching of the thruster auxiliary power supply is independent of the switching of the medium voltage main switchboard, mainly the switching of the incoming power supply of the thruster local auxiliary switchboard 27, and only the low voltage auxiliary power supply can be switched if a power loss fault occurs only on one side of the low voltage main switchboard. First, the fifth feeding switch 23 and the sixth feeding switch 24 are in a closed state, and by default, the propeller auxiliary device 30 is supplied with power from the third feeding switch 28 in a normally closed state on the local auxiliary power distribution board. When the ship propulsion control system finds that the first low-voltage main distribution board 25 has a power failure, a closing command is sent to the fourth incoming switch 29 in a normally open state, and the local auxiliary distribution board is powered by the second low-voltage main distribution board 26. Because the third incoming line switch 28 and the fourth incoming line switch 29 are provided with electrical interlocks, when the fourth incoming line switch 29 is switched on, the normally closed loop third incoming line switch 28 automatically opens. Meanwhile, in order to avoid the influence of instantaneous power loss in the switching process of the low-voltage auxiliary power supply, a special contactor is adopted in a related starting box of the auxiliary equipment 30 of the propeller, and the pull-in state can be maintained within 3 seconds of power loss, so that the operation signal is kept, and the dynamic positioning system is not influenced; for situations where a special contactor cannot be used, such as the control power supply of the thruster local auxiliary power board 27, a UPS is provided internally to maintain the control power supply during the switching process to supply power normally.

The foregoing is a preferred embodiment of the present invention, and it should be noted that it is obvious to those skilled in the art that various modifications and improvements can be made without departing from the principle of the present invention, and these modifications and improvements should be construed as the protection scope of the present invention.

Claims (10)

1. A thruster power switching system for a dynamically positioned vessel, the vessel including a first nacelle, a second nacelle, a first switchboard, a second switchboard, and a plurality of thruster bays separated by fire and watertight bulkheads, the thruster power switching system comprising:

a first generator set and a second generator set respectively positioned in the first cabin and the second cabin,

a first medium voltage main distribution board and a first low voltage main distribution board positioned between the first distribution boards, the first medium voltage main distribution board being electrically connected with the first generator set, the first medium voltage main distribution board being connected with the first low voltage main distribution board through a first feed switch,

a second medium voltage main distribution board and a second low voltage main distribution board which are positioned between the second distribution boards, wherein the second medium voltage main distribution board is electrically connected with the second generator set, the second medium voltage main distribution board is connected with the second low voltage main distribution board through a second feed switch,

a thruster local auxiliary switchboard located in the thruster compartment, the thruster local auxiliary switchboard being electrically connected with the first low voltage main switchboard and the second low voltage main switchboard respectively, the thruster local auxiliary switchboard being for connection with a corresponding thruster auxiliary device, and

the thruster switching cabinet is arranged in the thruster cabin and provided with a first switching switch and a second switching switch, the first switching switch is connected with the first medium-voltage main distribution board, and the second switching switch is connected with the second medium-voltage main distribution board.

2. The thruster power supply switching system of claim 1 wherein the thruster well is separated into separate wells by fire and watertight bulkheads, the thruster well and the thruster local auxiliary switchboard being provided in the thruster well.

3. The propeller power switching system of claim 1, wherein the switching system further comprises:

a third feeding switch disposed on the first medium voltage main distribution board, the first medium voltage main distribution board being connected with the first changeover switch through the third feeding switch.

4. The propeller power switching system of claim 3, wherein the switching system further comprises:

a fourth feeding switch disposed on the second medium voltage distribution main board, the second medium voltage main distribution board being connected to the second transfer switch through the fourth feeding switch;

the first change-over switch and the second change-over switch are mutually interlocked, so that only one of the first change-over switch and the second change-over switch can be switched on at any time.

5. The propeller power switching system of claim 1, wherein the switching system further comprises:

a first transformer disposed within the first distribution board, the first medium voltage main distribution board being connected to the first transformer through the first feed switch;

the first incoming line switch is arranged on the first low-voltage main distribution board, and the first transformer is connected with the first low-voltage main distribution board through the first incoming line switch.

6. The propeller power switching system of claim 5, wherein the switching system further comprises:

a second transformer disposed within the second distribution board, the second medium voltage main distribution board being connected to the second transformer through the second feed switch;

and the second incoming switch is arranged on the second low-voltage main distribution board, and the second transformer is connected with the second low-voltage main distribution board through the second incoming switch.

7. The propeller power switching system of claim 1, wherein the switching system further comprises:

a fifth feeding switch disposed on the first low voltage main panel;

a third service switch disposed on the thruster local auxiliary power board and connected to the fifth service switch.

8. The propeller power switching system of claim 7, wherein the switching system further comprises:

a sixth feeding switch disposed on the second low voltage main panel;

the fourth incoming switch is arranged on the local auxiliary power distribution board of the thruster and is connected with the sixth feed switch;

the third incoming line switch and the fourth incoming line switch are mutually interlocked, so that only one third incoming line switch and only one fourth incoming line switch can be switched on at any time.

9. The propeller power switching system of claim 8, wherein the switching system further comprises:

a propulsion motor disposed within the propeller capsule for driving the vessel;

the propelling frequency converter is arranged in the propeller cabin and is connected with the propelling motor;

and the propelling transformer is arranged in the propeller cabin, is connected with the propelling frequency converter and is respectively connected with the first change-over switch and the second change-over switch.

10. A dynamic positioning vessel comprising a thruster power supply switching system according to any one of claims 1 to 9.

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