Ship, bidirectional variable frequency driving system thereof, control method, control device and medium

Abstract

The invention discloses a ship, a bidirectional variable frequency driving system thereof, a control method, a control device and a medium, and relates to the technical field of ships. The bidirectional variable-frequency driving system of the ship comprises an axle generator, the first end of the axle generator is connected with a gear box, and the axle generator is used for converting kinetic energy output by the gear box into electric energy; the first end of the frequency converter is connected with the second end of the axle generator, and the frequency converter is used for adjusting the frequency of electric energy output by the axle generator; the first end of the isolation transformer is connected with the second end of the frequency converter, the second end of the isolation transformer is connected with the distribution board, and the isolation transformer is used for adjusting the voltage of output electric energy of the frequency converter. The energy consumption of the ship is reduced through the bidirectional variable frequency driving system.

Description

Technical Field

[0001] This application relates to the field of marine technology, and in particular to a ship and its bidirectional variable frequency drive system, control method, control device and medium. Background Technology

[0002] Currently, under the prevailing trend of energy conservation and environmental protection, bidirectional variable frequency drive systems are being constructed using shaft-driven synchronous motors on ships. Leveraging the reversibility of these motors, the systems can switch between generator and motor modes under different ship operating conditions. This allows the kinetic energy of the ship's propulsion system and the electrical energy of its power distribution system to complement each other, thereby meeting peak energy demands under specific ship operating conditions. However, existing bidirectional variable frequency drive systems suffer from technical challenges such as high energy consumption rates. Summary of the Invention

[0003] This application provides a ship and its bidirectional variable frequency drive system, control method, control device and medium to solve technical problems such as high energy consumption rate in the prior art.

[0004] A first aspect of this application provides a bidirectional variable frequency drive system for a ship, the ship including a switchboard and a gearbox, the bidirectional variable frequency drive system including: A shaft-driven generator, with its first end connected to a gearbox, is used to convert the kinetic energy output by the gearbox into electrical energy. The inverter has its first terminal connected to the second terminal of the shaft-driven generator and is used to adjust the frequency of the output power of the shaft-driven generator. An isolation transformer is used to adjust the voltage of the inverter's output power. The first end of the isolation transformer is connected to the second end of the frequency converter, and the second end of the isolation transformer is connected to the distribution board.

[0005] The bidirectional variable frequency drive system in this embodiment recovers excess kinetic energy from the gearbox and converts it into electrical energy, thus supplementing part of the ship's electrical energy needs and reducing the ship's energy consumption.

[0006] According to a second aspect of the present invention, a ship is provided, comprising a bidirectional variable frequency drive system as defined in the second aspect above, thus possessing all the beneficial technical effects of the bidirectional variable frequency drive system as defined in the second aspect above, which will not be elaborated further here.

[0007] A third aspect of this application provides a method for controlling a ship, wherein the ship is the ship defined in the second aspect above, and the method includes: During the operation of the gearbox, the control shaft drives the generator to convert the kinetic energy output by the gearbox into electrical energy. The frequency converter is controlled to adjust the frequency of the first electrical energy to obtain the second electrical energy; The isolation transformer is controlled to adjust the voltage of the second electrical energy source in order to obtain the third electrical energy source. Control the isolation transformer to transmit third electrical energy to the switchboard.

[0008] The ship control method in this embodiment recovers excess kinetic energy from the gearbox through a bidirectional frequency conversion drive system and converts the excess kinetic energy into electrical energy, supplementing part of the ship's electrical energy demand and thus reducing the ship's energy consumption.

[0009] A fourth aspect of this application provides a ship control device, including a processor and a memory. The memory stores a computer program, which, when executed by the processor, implements the steps of the ship control method as described in any of the above embodiments. Therefore, this ship control device possesses all the beneficial effects of the ship control method in any of the above embodiments, and will not be elaborated further here.

[0010] A fifth aspect of this application provides a readable storage medium storing a program or instructions that, when executed by a processor, implement the steps of the ship control method as described in any of the above embodiments. Therefore, this readable storage medium possesses all the beneficial effects of the ship control method in any of the above embodiments, which will not be elaborated further here. Attached Figure Description

[0011] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0012] Figure 1 This is one of the structural schematic diagrams of the bidirectional frequency conversion drive system provided in the embodiments of this application; Figure 2 This is a second schematic diagram of the bidirectional frequency conversion drive system provided in the embodiments of this application; Figure 3 A flowchart of a ship control method provided in the embodiments of this application; Figure 4 A structural block diagram of a ship control device provided in an embodiment of this application; in, Figure 1 and Figure 2 The correspondence between the reference numerals and component names in the attached drawings is as follows: 100 Bidirectional frequency conversion drive system, 101 Shaft-driven generator, 102 Frequency converter, 103 Isolation transformer, 104 Side thrust motor, 105 Auxiliary generator, 201 Switchboard, 202 Gearbox, 203 Power unit, 204 Propeller. Detailed Implementation

[0013] To better understand the technical solutions provided in the embodiments of this specification, the technical solutions of the embodiments of this specification will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the embodiments of this specification and the specific features in the embodiments are detailed descriptions of the technical solutions of the embodiments of this specification, rather than limitations on the technical solutions of this specification. In the absence of conflict, the embodiments of this specification and the technical features in the embodiments can be combined with each other.

[0014] In this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, without necessarily requiring or implying any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element. The term "two or more" includes two or more cases.

[0015] In some embodiments, such as Figure 1 As shown, an embodiment of this application provides a bidirectional variable frequency drive system 100 for a ship, comprising: A shaft-driven generator 101 is connected at its first end to a gearbox 202 and is used to convert the kinetic energy output by the gearbox 202 into electrical energy. Inverter 102, the first end of inverter 102 is connected to the second end of shaft-driven generator 101, and is used to adjust the frequency of the output power of shaft-driven generator 101. The isolation transformer 103 has its first end connected to the second end of the frequency converter 102 and its second end connected to the distribution board 201. It is used to adjust the voltage of the output power of the frequency converter 102.

[0016] In this embodiment, a bidirectional variable frequency drive system 100 for a ship is proposed, wherein the ship includes a power distribution board 201 and a gearbox 202, one end of the bidirectional variable frequency drive system 100 is connected to the power distribution board 201, and the other end of the bidirectional variable frequency drive system 100 is connected to the gearbox 202.

[0017] For example, the distribution board 201 is a complete electrical device for power distribution, circuit control and equipment protection, which typically includes components such as switches, protective devices (fuses, circuit breakers), meters and connection terminals.

[0018] For example, gearbox 202 is a mechanical transmission device that achieves speed conversion, torque amplification or direction adjustment through gear meshing, transmits power, regulates speed and enhances load capacity.

[0019] For example, the bidirectional frequency conversion drive system 100 is an electromechanical integrated system that uses power electronics technology to adjust the power supply frequency and voltage to achieve precise control and efficient operation of the motor.

[0020] The bidirectional variable frequency drive system 100 includes components such as a shaft-driven generator 101, a frequency converter 102, and an isolation transformer 103.

[0021] The first end of the shaft-driven generator 101 is connected to the gearbox 202, the first end of the frequency converter 102 is connected to the second end of the shaft-driven generator 101, the first end of the isolation transformer 103 is connected to the second end of the frequency converter 102, and the second end of the isolation transformer 103 is connected to the distribution board 201.

[0022] Among them, the shaft-driven generator 101 is used to convert the kinetic energy output by the gearbox 202 into electrical energy, the frequency converter 102 is used to adjust the frequency of the electrical energy output by the shaft-driven generator 101, and the isolation transformer 103 is used to adjust the voltage of the electrical energy output by the frequency converter 102.

[0023] For example, during the operation of a ship, the shaft-driven generator 101 can recover excess kinetic energy output from the gearbox 202 and convert the excess kinetic energy into electrical energy.

[0024] For example, the isolation transformer 103 can transmit electrical energy to the switchboard 201 and distribute the electrical energy to the various loads of the ship through the switchboard 201.

[0025] For example, the isolation transformer 103 can adjust the voltage of the power output from the frequency converter 102 to the voltage value required by the ship load.

[0026] It should be noted that the shaft-driven generator 101 in this embodiment can recover the excess kinetic energy output from the gearbox 202 and convert the excess kinetic energy into electrical energy. Then, through the frequency converter 102 and the isolation transformer 103, the frequency and voltage of the electrical energy are adjusted so that the power distribution board 201 can distribute it to the various loads of the ship, thereby reducing the ship's energy consumption.

[0027] The bidirectional variable frequency drive system 100 in this embodiment recovers excess kinetic energy from the gearbox 202 and converts it into electrical energy, thereby supplementing part of the ship's electrical energy needs and reducing the ship's energy consumption.

[0028] In some embodiments, this application provides a bidirectional variable frequency drive system 100 for a ship, the bidirectional variable frequency drive system 100 further comprising: The side thrust motor 104 is connected to the third terminal of the frequency converter 102 and is used to provide lateral power to the ship.

[0029] In this embodiment, the bidirectional variable frequency drive system 100 further includes a side thrust motor 104, wherein the side thrust motor 104 is connected to the third end of the frequency converter 102, and the side thrust motor 104 is used to provide lateral power to the ship.

[0030] For example, in the case of ship lateral movement, the side thrust motor 104 can provide lateral power to the ship so that the ship can complete the lateral movement.

[0031] In some embodiments, such as Figure 2 As shown, an embodiment of this application provides a bidirectional variable frequency drive system 100 for a ship, the bidirectional variable frequency drive system 100 further comprising: An auxiliary generator 105 is connected to a power distribution board 201 and is used to provide power to the power distribution board 201.

[0032] In this embodiment, the bidirectional frequency conversion drive system 100 further includes an auxiliary generator 105, which is connected to the power distribution board 201 and is used to provide power to the power distribution board 201.

[0033] For example, when the shaft-driven generator 101 is not operating, the auxiliary generator 105 is used to assist in supplying power to the switchboard 201.

[0034] In some embodiments, the present application provides a bidirectional variable frequency drive system 100 for a ship, wherein when the shaft generator 101 stops working, the auxiliary generator 105 is used to provide electrical energy to the switchboard 201; When the shaft-driven generator 101 is in operation, the shaft-driven generator 101 and the auxiliary generator 105 are used to simultaneously provide electrical energy to the switchboard 201.

[0035] In this embodiment, when the shaft-driven generator 101 stops working, the auxiliary generator 105 is used to provide electrical energy to the switchboard 201.

[0036] When the shaft-driven generator 101 is in operation, the shaft-driven generator 101 and the auxiliary generator 105 are used to simultaneously provide electrical energy to the switchboard 201.

[0037] For example, the power output of the auxiliary generator 105 is less than that of the shaft-driven generator 101.

[0038] For example, when the ship's power demand is low, power can be supplied to the switchboard 201 by the auxiliary generator 105.

[0039] In some embodiments, the present application provides a bidirectional variable frequency drive system 100 for a ship. The ship includes a power unit 203 and a propeller 204. The power unit 203 and the propeller 204 are connected to a gearbox 202. The power unit 203 is used to provide kinetic energy to the propeller 204. When the power unit 203 stops working, the shaft-driven generator 101 is used to provide kinetic energy to the propeller 204.

[0040] In this embodiment, the ship also includes a power unit 203 and a propeller 204, which are connected to a gearbox 202. The power unit 203 is used to provide kinetic energy to the propeller 204. For example, the power unit 203 can be a steam engine for a ship.

[0041] For example, the power unit 203 can be a diesel engine for a ship.

[0042] When the power unit 203 stops working, the shaft-driven generator 101 is used to provide kinetic energy to the propeller 204.

[0043] For example, the bidirectional variable frequency drive system 100 may also include a battery that can store electrical energy output by the shaft generator 101.

[0044] For example, when the power unit 203 stops working, the battery can supply power to the shaft generator 101, enabling the shaft generator 101 to drive the propeller 204.

[0045] In some embodiments, a ship is provided, including a bidirectional variable frequency drive system as described in any of the above embodiments, and thus possesses all the beneficial technical effects of the bidirectional variable frequency drive system described in any of the above embodiments, which will not be elaborated further here.

[0046] In some embodiments, such as Figure 3 As shown, a ship control method is provided, including: Step S301: During the operation of the gearbox, the control shaft drives the generator to convert the kinetic energy output by the gearbox into the first electrical energy. Step S302: Control the frequency converter to adjust the frequency of the first electrical energy to obtain the second electrical energy; Step S303: Control the isolation transformer to adjust the voltage of the second electrical energy to obtain the third electrical energy; Step S304: Control the isolation transformer to transmit the third electrical energy to the switchboard.

[0047] In this embodiment, a ship control method is proposed. The ship is the ship in any of the above embodiments. The ship includes a bidirectional variable frequency drive system, a switchboard and a gearbox. The variable frequency drive system includes a shaft-driven generator, a frequency converter and an isolation transformer.

[0048] During the operation of the gearbox, the control shaft-driven generator converts the kinetic energy output by the gearbox into first electrical energy, which is the electrical energy output by the shaft-driven generator.

[0049] For example, a shaft-driven generator can convert excess kinetic energy output from a gearbox into first electrical energy.

[0050] The frequency converter is controlled to adjust the frequency of the first electrical energy to obtain the second electrical energy.

[0051] For example, the frequency of the first electrical energy is adjusted to a preset frequency by a frequency converter so that the first electrical energy is converted into the second electrical energy.

[0052] The isolation transformer is controlled to adjust the voltage of the second electrical energy source in order to obtain the third electrical energy source. For example, the voltage of the second electrical energy is adjusted to a preset voltage by an isolation transformer so that the second electrical energy is converted into the third electrical energy.

[0053] Control the isolation transformer to transmit third electrical energy to the switchboard.

[0054] For example, a switchboard can distribute third electrical energy to the various loads on a ship.

[0055] The ship control method in this embodiment recovers excess kinetic energy from the gearbox through a bidirectional frequency conversion drive system and converts the excess kinetic energy into electrical energy, supplementing part of the ship's electrical energy demand and thus reducing the ship's energy consumption.

[0056] In some embodiments, a method for controlling a ship is provided, the ship including a power unit and a propeller, the power unit being used to provide kinetic energy to the propeller, the method further comprising: When the power unit stops working, the control shaft drives the generator to provide kinetic energy to the propeller.

[0057] In this embodiment, the ship includes a power unit and a propeller. The power unit provides kinetic energy to the propeller. When the power unit stops working, a control shaft drives a generator to provide kinetic energy to the propeller.

[0058] For example, the bidirectional variable frequency drive system may also include a battery that can store electrical energy output from the shaft-driven generator.

[0059] For example, when the power unit stops working, the battery can supply power to the shaft-driven generator, enabling the shaft-driven generator to drive the propeller.

[0060] For example, a vessel may be equipped with two shaft generators, two thrust motors, two auxiliary generators, and a main switchboard. The AC / DC rectifier module of each inverter is connected to one shaft generator and one thrust motor, while the DC / AC inverter module is connected to the main switchboard via an isolation transformer.

[0061] In PTO (Power Output) mode, the main unit drives the propeller and shaft-driven generator via a clutch. The shaft-driven generator supplies power to the grid and can operate in parallel with the auxiliary generator.

[0062] In PTI (Power Input Transmission) mode, the shaft-driven generator operates as a synchronous motor, providing power to the propeller either together with the main engine or when the main engine is stopped.

[0063] For example, the shaft-driven motor adopts a variable-speed constant-frequency permanent magnet synchronous motor, which organically combines mechanical propulsion and electric propulsion, so that the main unit and the shaft-driven generator can drive the propeller separately or simultaneously to adapt to the system requirements under different working conditions.

[0064] For example, the inverter internally includes a three-phase full-bridge rectifier and inverter unit, employing a reversible PWM control scheme that allows bidirectional energy flow, reflected in its AC / DC rectification characteristics and DC / AC active inverter characteristics. On the inverter input side, within the main unit speed range, the inverter rectifier unit can output stable DC power to the inverter unit, ensuring the inverter unit outputs high-quality three-phase AC voltage to meet the normal power requirements of the load. The inverter unit uses virtual synchronous generator control technology, enabling the shaft-driven generator to operate in a grid with the auxiliary generator for extended periods. The inverter features a common DC bus architecture and a modular design, separating the rectifier and inverter units. Through flexible unit combinations, it can be configured into a multi-drive inverter. By using DC power input for inverter equipment such as side-push pumps, cargo oil pumps, and variable frequency shore power systems, the number of inverter rectifier modules can be simplified. Multiple devices can share a single rectifier unit, and its regenerative energy can be consumed electrically by other motors in the same system, thus achieving energy saving and consumption reduction.

[0065] For example, isolation transformers are used to suppress common-mode voltage generated in PWM inverter drive systems, reducing the harm to motor drive systems.

[0066] This embodiment combines a permanent magnet shaft motor, a common DC bus frequency converter, and an isolation transformer. The frequency converter adopts a modular design, allowing for easy power expansion in a modular fashion. It allows for the use of DC power input for components such as the bow thrust motor and cargo oil pump, reducing the number of frequency converters required. The entire system saves space, enables bidirectional energy flow, and improves power generation efficiency and grid quality.

[0067] In some embodiments, such as Figure 4 As shown, a ship control device 400 is proposed. The ship control device 400 includes a processor 402 and a memory 404. The memory 404 stores a computer program, which, when executed by the processor 402, implements the steps of the ship control method as described in any of the above embodiments. Therefore, the ship control device 400 possesses all the beneficial effects of the ship control method in any of the above embodiments, which will not be elaborated further here.

[0068] In some embodiments, a readable storage medium is provided having a program stored thereon, which, when executed by a processor, implements the steps of the ship control method as described in any of the above embodiments, and thus has all the beneficial technical effects of the ship control method described in any of the above embodiments.

[0069] It should be noted that the descriptions of each embodiment in the above embodiments have different focuses. For parts that are not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0070] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-readable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-readable program code.

[0071] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded computer, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create a machine for implementing the flowchart illustrations. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0072] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0073] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0074] This application also provides a computer program product, which includes computer software instructions that, when executed on a processing device, cause the processing device to execute a process of a ship control method.

[0075] A computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, all or part of the flow or function according to the embodiments of this application is generated. The computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, computer instructions may be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via wired (e.g., coaxial cable, fiber optic, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means. The computer-readable storage medium may be any available medium that a computer can store or a data storage device such as a server or data center that integrates one or more available media. The available medium may be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., solid-state disk (SSD)).

[0076] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0077] In the several embodiments provided in this application, it should be understood that the disclosed devices, apparatuses, and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces, or indirect coupling or communication connection between devices or units, and may be electrical, mechanical, or other forms.

[0078] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0079] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0080] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods of the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0081] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

[0082] Although preferred embodiments have been described in this specification, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this specification.

[0083] Obviously, those skilled in the art can make various modifications and variations to this specification without departing from its spirit and scope. Therefore, if such modifications and variations fall within the scope of the claims and their equivalents, this specification is also intended to include such modifications and variations.

Claims

1. A bidirectional variable frequency drive system for a marine vessel, characterized by, The ship comprises a power distribution board and a gearbox, and the bidirectional variable frequency drive system comprises: a shaft generator, a first end of the shaft generator being connected with the gearbox, for converting kinetic energy output by the gearbox into electric energy; a frequency converter, a first end of the frequency converter being connected with a second end of the shaft generator, for adjusting the frequency of the electric energy output by the shaft generator; an isolation transformer, a first end of the isolation transformer being connected with a second end of the frequency converter, and a second end of the isolation transformer being connected with the power distribution board, for adjusting the voltage of the electric energy output by the frequency converter.

2. The bidirectional variable frequency drive system of claim 1, wherein, The bidirectional variable frequency drive system further comprises: a side thrust motor, the side thrust motor being connected with a third end of the frequency converter, for providing lateral power to the ship.

3. The bidirectional variable frequency drive system of claim 1, wherein, The bidirectional variable frequency drive system further comprises: an auxiliary generator, the auxiliary generator being connected with the power distribution board, and the auxiliary generator being used for providing electric energy to the power distribution board.

4. The bidirectional variable frequency drive system according to claim 3, wherein: in the case that the shaft generator stops working, the auxiliary generator is used for providing electric energy to the power distribution board; in the case that the shaft generator works, the shaft generator and the auxiliary generator are used for simultaneously providing electric energy to the power distribution board.

5. The bidirectional variable frequency drive system of any one of claims 1 to 4, wherein, The ship comprises a power device and a propeller, the power device and the propeller being connected with the gearbox, and the power device being used for providing kinetic energy to the propeller; in the case that the power device stops working, the shaft generator is used for providing kinetic energy to the propeller.

6. A vessel characterised in that, The ship comprises: the bidirectional variable frequency drive system according to any one of claims 1 to 5.

7. A control method of a ship, characterized by, The ship is the ship according to claim 7, and the method comprises: in the process of the operation of the gearbox, controlling the shaft generator to convert kinetic energy output by the gearbox into first electric energy; controlling the frequency converter to adjust the frequency of the first electric energy to obtain second electric energy; controlling the isolation transformer to adjust the voltage of the second electric energy to obtain third electric energy; controlling the isolation transformer to transmit the third electric energy to the power distribution board.

8. The method of claim 7, wherein, The ship comprises a power device and a propeller, the power device being used for providing kinetic energy to the propeller, and the method further comprises: in the case that the power device stops working, controlling the shaft generator to provide kinetic energy to the propeller.

9. A control device for a marine vessel, characterized in that comprise: a processor; a memory, the memory storing programs or instructions, and the processor implementing the steps of the control method of the ship according to claim 7 or 8 when executing the programs or instructions in the memory.

10. A readable storage medium, characterized by, programs or instructions are stored on a readable storage medium, and the programs or instructions are executed by a processor to implement the steps of the control method of the ship according to claim 7 or 8.

Images