Ship hybrid power system based on multi-source flexible dc loop network and control method thereof

Abstract

The embodiment of the application discloses a ship hybrid power system based on a multi-source flexible DC ring network and a control method thereof, and can be applied to the technical field of ship control. The system of the application sets up a natural gas power module, a hydrogen fuel cell power module and a lithium iron phosphate battery power module respectively, sets up the natural gas power module to be connected with a ship gearbox through a first clutch, controls the state of the natural gas power module outputting power to the ship through the on-off state of the first clutch, sets up the hydrogen fuel cell power module and the lithium iron phosphate battery power module to be connected with a multi-source flexible DC ring network, thereby the on-off state of a second clutch and a third clutch can be used to control the state of the hydrogen fuel cell power module and the lithium iron phosphate battery power module outputting power to the ship gearbox, and then the ship can be provided with various multi-source hybrid power modes, and the problems of insufficient power of a pure natural gas engine and short cruising range of a pure electric ship can be effectively solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of ship control, and in particular to a ship hybrid power system based on a multi-source flexible DC ring network and a control method thereof. BACKGROUND

[0002] In related technologies, natural gas as a fuel for ship engines has advantages including abundant resources, low emission pollution, low price, etc. Natural gas, which is mainly composed of methane, is a gaseous fuel that can be fully mixed with air, so that there is basically no particulate emission after combustion, and the CO generation after combustion is also very small. Compared with other fossil fuels, the pollutant emissions generated in the whole life cycle of mining, production, storage, transportation and use are the least, but there are disadvantages such as low energy density, which leads to insufficient power of the ship engine when pure natural gas provides power. The pure electric ship power system has advantages such as zero emission, simple ship structure, higher transmission efficiency, and low operating cost compared with traditional fuel ships, but the endurance mileage is short.

[0003] In summary, the technical problems in related technologies need to be improved. SUMMARY

[0004] The main purpose of the embodiments of the present application is to propose a ship hybrid power system based on a multi-source flexible DC ring network and a control method thereof, which can effectively solve the problems of insufficient power of pure natural gas engine and short endurance mileage of pure electric ship.

[0005] To achieve the above-mentioned purpose, one aspect of the embodiments of the present application proposes a ship hybrid power system based on a multi-source flexible DC ring network, which comprises:

[0006] A natural gas power module, which is connected with a ship gearbox through a first clutch, and the ship gearbox is connected with a ship propeller;

[0007] A hydrogen fuel cell power module, which is connected with a multi-source flexible DC ring network;

[0008] A lithium iron phosphate battery power module, which is connected with the multi-source flexible DC ring network;

[0009] Wherein, the natural gas power module provides electric energy to the ship gearbox or the lithium iron phosphate battery power module through the first clutch; and the electric energy in the multi-source flexible DC ring network provides electric energy to the ship gearbox through a second clutch or a third clutch.

[0010] In some embodiments, the natural gas power module comprises:

[0011] An LNG liquid storage tank;

[0012] an LNG vaporizer, an input end of the LNG vaporizer being connected with an output end of the LNG storage tank;

[0013] a one-way valve, a first end of the one-way valve being connected with an output end of the LNG vaporizer;

[0014] a natural gas engine, a gas input end of the natural gas engine being connected with a second end of the one-way valve, an electric energy output end of the natural gas engine being connected with the ship gearbox through the first clutch.

[0015] In some embodiments, the lithium iron phosphate battery power module comprises a first lithium iron phosphate battery power sub-module and a second lithium iron phosphate battery power sub-module;

[0016] the first lithium iron phosphate battery power sub-module comprises a first lithium iron phosphate battery and a first direct current converter, the first lithium iron phosphate battery being connected with the multi-source flexible direct current looped network through the first direct current converter;

[0017] the second lithium iron phosphate battery power sub-module comprises a second lithium iron phosphate battery and a second direct current converter, the second lithium iron phosphate battery being connected with the multi-source flexible direct current looped network through the second direct current converter;

[0018] the hydrogen fuel cell power module comprises a first hydrogen fuel cell power sub-module and a second hydrogen fuel cell power sub-module;

[0019] the first hydrogen fuel cell power sub-module comprises a first hydrogen fuel cell and a third direct current converter, the first hydrogen fuel cell being connected with the multi-source flexible direct current looped network through the third direct current converter;

[0020] the second hydrogen fuel cell power sub-module comprises a second hydrogen fuel cell and a fourth direct current converter, the second hydrogen fuel cell being connected with the multi-source flexible direct current looped network through the fourth direct current converter.

[0021] In some embodiments, the system further comprises a first manual switch, a second manual switch, a first automatic switch and a second automatic switch;

[0022] a power supply end of the first manual switch being connected with an output end of the second direct current converter;

[0023] a power supply end of the second manual switch being connected with an output end of the first direct current converter;

[0024] a power supply end of the first automatic switch being connected with an output end of the third direct current converter;

[0025] The power supply end of the second automatic switch is connected with the output end of the fourth direct current converter.

[0026] The first manual switch, the first automatic switch, the second manual switch and the second automatic switch are sequentially connected to form the multi-source flexible direct current looped network.

[0027] In some embodiments, the system further comprises a first reversible motor, a second reversible motor, a first inverter and a second inverter;

[0028] The first end of the first inverter is connected with the first automatic switch, the second end of the first inverter is connected with the first end of the first reversible motor, and the second end of the first reversible motor is connected with the ship gear box through the third clutch;

[0029] The first end of the second inverter is connected with the second automatic switch, the second end of the second inverter is connected with the first end of the second reversible motor, and the second end of the second reversible motor is connected with the ship gear box through the second clutch.

[0030] In some embodiments, the system further comprises a third inverter and a fourth inverter;

[0031] The first end of the third inverter is connected with the first manual switch, and the second end of the third inverter is connected with a ship load;

[0032] The first end of the fourth inverter is connected with the second manual switch, and the second end of the fourth inverter is connected with a ship load.

[0033] In some embodiments, the system further comprises a fifth inverter and a sixth inverter;

[0034] The first end of the fifth inverter is connected with the first direct current converter, and the second end of the fifth inverter is connected with a preset load;

[0035] The first end of the sixth inverter is connected with the second direct current converter, and the second end of the sixth inverter is connected with a preset load.

[0036] In some embodiments, the system further comprises a solid state switch module for controlling the flow path of electric energy.

[0037] In some embodiments, the solid state switch module comprises a first solid state switch, a second solid state switch, a third solid state switch and a fourth solid state switch;

[0038] The first end of the first solid state switch is connected with the third clutch, the first direct current converter, the first reversible motor and the first end of the second solid state switch, respectively;

[0039] a second end of the first solid-state switch is connected with a first end of the fourth solid-state switch respectively;

[0040] a second end of the second solid-state switch is connected with a first end of the third solid-state switch;

[0041] a second end of the third solid-state switch is connected with a second end of the fourth solid-state switch.

[0042] To achieve the above object, another aspect of the embodiment of the present application provides a control method of a ship hybrid power system based on a multi-source flexible DC loop network, and the method comprises the following steps:

[0043] acquiring a ship working mode;

[0044] controlling a working state of the system according to the ship working mode.

[0045] The embodiment of the present application at least has the following beneficial effects: the present application provides a ship hybrid power system based on a multi-source flexible DC loop network and a control method thereof, the system of the present application is provided with a natural gas power module, a hydrogen fuel cell power module and a lithium iron phosphate battery power module, the natural gas power module is connected with a ship gearbox through a first clutch, the state of the natural gas power module outputting power to the ship is controlled through the switching state of the first clutch, the hydrogen fuel cell power module and the lithium iron phosphate battery power module are both connected with the multi-source flexible DC loop network, the state of the hydrogen fuel cell power module and the lithium iron phosphate battery power module outputting power to the ship gearbox is controlled through the switching state of a second clutch and a third clutch, and the ship can be provided with multiple multi-source hybrid power modes, the problems of insufficient power of a pure natural gas engine and short cruising range of a pure electric ship are effectively solved. BRIEF DESCRIPTION OF DRAWINGS

[0046] Figure 1 is a schematic diagram of a ship hybrid power system based on a multi-source flexible DC loop network provided by the embodiment of the present application. DETAILED DESCRIPTION

[0047] In order to make the objects, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and not intended to limit the present application. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the following exemplary embodiments do not represent all implementations consistent with embodiments of the present application. They are only examples of devices and methods consistent with some aspects of embodiments of the present application.

[0048] It can be understood that the terms "first", "second" and the like used in the present application can be used herein to describe various concepts, but unless specifically stated, these concepts are not limited by these terms. These terms are only used to distinguish one concept from another concept. For example, without departing from the scope of embodiments of the present application, the first information can also be referred to as the second information, and similarly, the second information can also be referred to as the first information. Depending on the context, the word "if" as used herein can be interpreted as "when" or "when" or "in response to determining".

[0049] The terms "at least one", "multiple", "each", "any" and the like used in the present application include one, two or more than two, multiple includes two or more than two, each refers to each of the corresponding multiple, and any refers to any one of the multiple.

[0050] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as understood by a person skilled in the art to which the present application belongs. The terms used herein are only for the purpose of describing the embodiments of the present application and are not intended to limit the present application.

[0051] Before the embodiments of the present application are described in detail, first, some nouns and terms involved in the embodiments of the present application are described, and the nouns and terms involved in the embodiments of the present application are applicable to the following explanations:

[0052] LNG (liquefied natural gas) is a clean and efficient energy, and its main component is methane. LNG is colorless, odorless, non-toxic and non-corrosive, its volume is about 1 / 600 of the same amount of gaseous natural gas, the weight of LNG is only about 45% of the same volume of water, and the heat value is 52 MMBtu / t (1 MMBtu = 2.52 x 10^8 cal).

[0053] The embodiment of the application provides a ship hybrid power system based on a multi-source flexible DC ring network and a control method thereof, the system of the embodiment is provided by arranging a natural gas power module, a hydrogen fuel cell power module and a lithium iron phosphate battery power module, the natural gas power module is connected with a ship gearbox through a first clutch, the state of the natural gas power module outputting power to the ship is controlled through the on-off state of the first clutch, the hydrogen fuel cell power module and the lithium iron phosphate battery power module are connected with the multi-source flexible DC ring network, and the state of the hydrogen fuel cell power module and the lithium iron phosphate battery power module outputting power to the ship gearbox is controlled through the on-off state of a second clutch and a third clutch, so that the ship can be provided with multiple multi-source hybrid power modes, and the problems of insufficient power of a pure natural gas engine and short cruising range of a pure electric ship are effectively solved.

[0054] Figure 1 is an optional flowchart of the ship hybrid power system based on the multi-source flexible DC ring network provided by the embodiment of the application, Figure 1 The system in the embodiment of the application can include but is not limited to including a natural gas power module, a hydrogen fuel cell power module and a lithium iron phosphate battery power module. The natural gas power module is connected with a ship gearbox through a first clutch, the ship gearbox is connected with a ship propeller; the hydrogen fuel cell power module is connected with a multi-source flexible DC ring network; the lithium iron phosphate battery power module is connected with the multi-source flexible DC ring network; wherein the natural gas power module provides electric energy to the ship gearbox or the lithium iron phosphate battery power module through the first clutch 20a; the electric energy in the multi-source flexible DC ring network provides electric energy to the ship gearbox through a second clutch 20b or a third clutch 20c.

[0055] It can be understood that the natural gas power module of the embodiment of the application includes an LNG storage tank 151, an LNG vaporizer 141, a one-way valve 131 and a natural gas engine 101, the input end of the LNG vaporizer 141 is connected with the output end of the LNG storage tank 151, the first end of the one-way valve 131 is connected with the output end of the LNG vaporizer 141, the gas input end of the natural gas engine 101 is connected with the second end of the one-way valve 131, and the electric energy output end of the natural gas engine 101 is connected with the ship gearbox 301 through the first clutch 20a. Specifically, the LNG storage tank is used for storing liquefied natural gas. When it is needed to provide power to the ship gear, the one-way valve is controlled to be opened and the first clutch is connected, and then the liquefied natural gas stored in the LNG storage tank is transported to the LNG vaporizer, the gas processed through the LNG vaporizer is transported to the natural gas engine, the electric energy is transported to the ship gearbox through the natural gas engine after the natural gas engine works, the ship gearbox is controlled to work, and then the ship propeller 401 is driven to work to drive the moving state of the ship.

[0056] In the embodiment of the present application, the lithium iron phosphate battery power module includes a first lithium iron phosphate battery power sub-module and a second lithium iron phosphate battery power sub-module; the first lithium iron phosphate battery power sub-module includes a first lithium iron phosphate battery 11a and a first direct current converter 10a, and the first lithium iron phosphate battery 11a is connected to a multi-source flexible direct current loop network through the first direct current converter 10a; the second lithium iron phosphate battery power sub-module includes a second lithium iron phosphate battery 11b and a second direct current converter 10b; the second lithium iron phosphate battery 11b is connected to the multi-source flexible direct current loop network through the second direct current converter 10b; the hydrogen fuel cell power module includes a first hydrogen fuel cell power sub-module and a second hydrogen fuel cell power sub-module; the first hydrogen fuel cell power sub-module includes a first hydrogen fuel cell 12a and a third direct current converter 10c, and the first hydrogen fuel cell 12a is connected to the multi-source flexible direct current loop network through the third direct current converter 10c; the second hydrogen fuel cell power sub-module includes a second hydrogen fuel cell 12b and a fourth direct current converter 10d, and the second hydrogen fuel cell 12b is connected to the multi-source flexible direct current loop network through the fourth direct current converter 10d. Specifically, when driving electric energy is provided to the ship through the lithium iron phosphate battery power module or the hydrogen fuel cell power module, after the second clutch and the third clutch are controlled to be disconnected, the first direct current converter delivers the direct current voltage in the first lithium iron phosphate battery to the multi-source flexible direct current loop network after boosting the voltage, or the second direct current converter delivers the direct current voltage in the second lithium iron phosphate battery to the multi-source flexible direct current loop network after boosting the voltage, or the third direct current converter delivers the direct current voltage in the first hydrogen fuel cell to the multi-source flexible direct current loop network after boosting the voltage, or the fourth direct current converter delivers the direct current voltage in the second hydrogen fuel cell to the multi-source flexible direct current loop network after boosting the voltage, and then the driving electric energy is delivered to the ship through the multi-source flexible direct current loop network, thereby controlling the movement process of the ship.

[0057] In the embodiment of the present application, Figure 1The system also includes a first manual switch 80a, a second manual switch 80b, a first automatic switch 90a, and a second automatic switch 90b; the power supply end of the first manual switch 80a is connected with the output end of the second DC converter 10b; the power supply end of the second manual switch 80b is connected with the output end of the first DC converter 10a; the power supply end of the first automatic switch 90a is connected with the output end of the third DC converter 10c; the power supply end of the second automatic switch 90b is connected with the output end of the fourth DC converter 10d; wherein the first manual switch 80a, the first automatic switch 90a, the second manual switch 80b, and the second automatic switch 90b are connected in sequence to form a multi-source flexible DC loop network. Specifically, the multi-source flexible DC loop network formed in this embodiment can integrate the power transmission and distribution functions of multiple energy sources, and realize multi-path transmission of power through multi-point power supply and loop network structure. The application of the multi-source flexible DC loop network to the ship multi-energy hybrid power system can realize energy integration and load optimization. It can be understood that the manual switch of this embodiment can be controlled to be switched on or off according to the operation state of the staff; the automatic switch can be automatically controlled to be switched on or off according to the control instruction triggered by the control end.

[0058] In the embodiments of the present application, Figure 1 The system also includes a first reversible motor 60a, a second reversible motor 60b, a first inverter 70a, and a second inverter 70b; the first end of the first inverter 70a is connected with the first automatic switch 90a, the second end of the first inverter 70a is connected with the first end of the first reversible motor 60a, and the second end of the first reversible motor 60a is connected with the ship gear box through the third clutch 20c; the first end of the second inverter 70b is connected with the second automatic switch 90b, the second end of the second inverter 70b is connected with the first end of the second reversible motor 60b, and the second end of the second reversible motor 60b is connected with the ship gear box 301 through the second clutch 20b. Specifically, the working mode of the first reversible motor and the second reversible motor includes a power generation mode and a charging mode. It can be understood that when the lithium iron phosphate battery in the lithium iron phosphate battery power module supplies power, the working mode of the first reversible motor and the second reversible motor is the power generation mode, and the first inverter and the second inverter can provide power in the power grid to the first reversible motor, the second reversible motor, or can deliver the power generated by the first reversible motor and the second reversible motor in the power generation mode to the power grid, thereby storing the power in the lithium iron phosphate battery. Specifically, when the lithium iron phosphate battery in the lithium iron phosphate battery power module is charged, the working mode of the first reversible motor and the second reversible motor is the charging mode. Wherein, when the lithium iron phosphate battery is charged, the lithium iron phosphate battery can be charged by the natural gas power module.

[0059] In the embodiments of the present application, Figure 1The system also includes a third inverter 70c and a fourth inverter 70d; the first end of the third inverter 70c is connected with the first manual switch 80a, and the second end of the third inverter 70c is connected with the ship load; the first end of the fourth inverter 70d is connected with the second manual switch 80b, and the second end of the fourth inverter 70d is connected with the ship load. The third inverter and the fourth inverter in the embodiment provide AC power for the ship load, so that the stable operation process of the ship load can be maintained.

[0060] In the embodiment of the application, Figure 1 The system also includes a fifth inverter 70e and a sixth inverter 70f; the first end of the fifth inverter 70e is connected with the first DC converter 10a, and the second end of the fifth inverter 70e is connected with the preset load; the first end of the sixth inverter 70f is connected with the second DC converter 10b, and the second end of the sixth inverter 70f is connected with the preset load. The fifth inverter and the sixth inverter in the embodiment provide AC power for the daily load on the ship, so that the stable operation process of the daily load on the ship can be maintained.

[0061] In the embodiment of the application, Figure 1 The system also includes a solid-state switch module, which is used to control the flow path of electric energy, so that a specific path can be selectively turned on or off to realize flexible connection between the power supply and the load.

[0062] Specifically, the solid-state switch module includes a first solid-state switch 50a, a second solid-state switch 50b, a third solid-state switch 50c, and a fourth solid-state switch 50d; the first end of the first solid-state switch 50a is connected with the third clutch 20c, the first DC converter 10a, the first reversible motor 60a, and the first end of the second solid-state switch 50b respectively; the second end of the first solid-state switch 50a is connected with the second clutch 20b, the fourth DC converter 10d, the second reversible motor 60b, and the first end of the fourth solid-state switch 50d respectively; the second end of the second solid-state switch 50b is connected with the first end of the third solid-state switch 50c; the second end of the third solid-state switch 50c is connected with the second end of the fourth solid-state switch 50d. The connection of the multiple solid-state switches in the embodiment can quickly disconnect the fault line and isolate it when a fault occurs in a part of the line, so as to ensure the normal operation of other parts.

[0063] It can be understood that, based on the connection relationship of the components in the above system, the system of the application can realize four ship propulsion modes.

[0064] The first is a pure mechanical propulsion mode, in which the first clutch between the natural gas engine and the gearbox is disconnected, the second clutch and the third clutch between the gearbox and the first reversible motor and the second reversible motor are disconnected, the check valve is opened, the liquefied natural gas in the LNG storage tank is vaporized by the LNG vaporizer and then delivered to the natural gas engine, the natural gas engine runs, and the propeller of the ship is driven by the natural gas engine alone.

[0065] The second is a pure electric propulsion mode, in which the first clutch between the natural gas engine and the gearbox is disconnected, the second clutch and the third clutch between the gearbox and the first reversible motor and the second reversible motor are connected, the first reversible motor and the second reversible motor are in motor mode, the required electric energy is provided by the first lithium iron phosphate battery and the second lithium iron phosphate battery through the first DC converter and the second DC converter, or by the first hydrogen fuel cell and the second hydrogen fuel cell through the third DC converter and the fourth DC converter, and the propeller is driven by the first reversible motor and the second reversible motor alone.

[0066] The third is a hybrid propulsion mode, in which the first clutch between the natural gas engine and the gearbox is connected, the second clutch and the third clutch between the gearbox and the first reversible motor and the second reversible motor are connected, the check valve is opened, the liquefied natural gas in the LNG storage tank is vaporized by the LNG vaporizer and then delivered to the natural gas engine to make the engine run. The first reversible motor and the second reversible motor are in motor mode, the required electric energy is provided by the first lithium iron phosphate battery and the second lithium iron phosphate battery through the first DC converter and the second DC converter, or by the first hydrogen fuel cell and the second hydrogen fuel cell through the third DC converter and the fourth DC converter, and the propeller is driven by the natural gas engine and the first reversible motor and the second reversible motor.

[0067] The fourth is a natural gas engine propulsion auxiliary charging mode, in which the first clutch between the natural gas engine and the gearbox is disconnected, the second clutch between the gearbox and the first reversible motor and the second reversible motor is disconnected, the one-way valve is opened, the liquefied natural gas in the LNG storage tank is vaporized by the LNG vaporizer and then delivered to the natural gas engine to make the engine run, the first reversible motor and the second reversible motor are in the generator mode, the natural gas engine simultaneously drives the propeller and the first reversible motor and the second reversible motor to rotate, and the electric energy generated by the first reversible motor and the second reversible motor is merged into the ring network through the first inverter, the second inverter, the first automatic switch and the second automatic switch, and is charged to the first lithium iron phosphate battery and the second lithium iron phosphate battery through the first DC converter and the second DC converter.

[0068] As can be seen from the above, the system provided by the embodiments of the present application can integrate multiple energy types, not only can select the most suitable energy use strategy in different working conditions to improve energy utilization efficiency, but also can solve the problems of insufficient endurance and poor power performance of pure electric ships and the problem of poor dynamic response of pure mechanical ships with natural gas engines as the only power source. The multi-source flexible DC ring network realizes multi-path transmission of power through multi-point power supply and ring network structure, so that even if a line fails, other paths can still work normally to ensure the stability of the system. Moreover, the intelligent energy management system can monitor and dispatch the output of each power source in real time, automatically adjust power distribution according to demand, and optimize energy utilization efficiency.

[0069] In addition, the embodiments of the present application also provide a control method of a ship hybrid power system based on a multi-source flexible DC ring network, which comprises the following steps:

[0070] Obtaining a ship working mode;

[0071] Controlling the working state of the system according to the ship working mode. Figure 1

[0072] It can be understood that the embodiments of the present application can achieve the beneficial effects of the system described above when controlling the system to work.

[0073] The embodiments described in the embodiments of the present application are used to more clearly illustrate the technical solutions of the embodiments of the present application, and do not constitute a limitation on the technical solutions provided by the embodiments of the present application. Those skilled in the art can know that, with the evolution of technology and the appearance of new application scenarios, the technical solutions provided by the embodiments of the present application are also applicable to similar technical problems.

[0074] Those skilled in the art can understand that the technical solutions shown in the figures do not constitute a limitation on the embodiments of the present application, and can include more or fewer steps than those shown in the figures, or combine certain steps or different steps.​

[0075] The device embodiments described above are merely illustrative, wherein the units described as separate components can or can not be physically separate, i.e., can be located in one place, or can be distributed to multiple network units. Part or all of the modules can be selected according to actual needs to achieve the purpose of the embodiment.

[0076] Those skilled in the art can understand that all or some of the steps in the method disclosed above, the functional modules / units in the system and the device can be implemented as software, firmware, hardware and appropriate combinations thereof.

[0077] The terms "first", "second", "third", "fourth" and the like in the description of the application and in the claims, if any, are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the use of these terms herein is merely for distinguishing between the comparable objects and the use of these terms in the description and the claims of the application is not to be construed as requiring or implying that the application has to be used in the order as described or related herein. Moreover, the terms "comprising", "having", "including", and the like, when used in the description and the claims of the application, are each intended to indicate the inclusion of a feature, integer, step, process, operation, or the like to the process, method, system, product or apparatus as claimed, but do not on their own require the inclusion of any other features, integers, steps, processes, operations, or the like. In other words, these terms are used in their open-ended, non-limiting sense and can be used in conjunction with other terms such as "consisting of", "consisting essentially of", "only", "not comprising", "not including", "not consisting of", "not consisting essentially of", and the like.

[0078] It should be understood that, in the present application, "at least one" means one or more, and "multiple" means two or more. "And / or" is used to describe the relationship between the associated objects, which means that there can be three relationships, for example, "A and / or B" can mean that there are three cases: only A, only B, and A and B at the same time, where A and B can be singular or plural. The character " / " generally represents an "or" relationship between the front and rear associated objects. "At least one of the following" or the like means any combination of these items, including any combination of single or multiple items. For example, at least one of a, b or c can mean a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, and c can be single or multiple.

[0079] The preferred embodiments of the application are described above with reference to the accompanying drawings, and are not limited to the scope of the application. Any modifications, equivalent replacements and improvements made by those skilled in the art without departing from the scope and essence of the application shall be within the scope of the application.

Claims

1. A ship hybrid power system based on multi-source flexible DC ring network, characterized in that, The system comprises: a natural gas power module connected with a ship gearbox through a first clutch, the ship gearbox being connected with a ship propeller; a hydrogen fuel cell power module connected with a multi-source flexible DC loop network; a lithium iron phosphate battery power module connected with the multi-source flexible DC loop network; a solid-state switch module for controlling the flow path of electric energy; the solid-state switch module comprises a first solid-state switch, a second solid-state switch, a third solid-state switch and a fourth solid-state switch; a first end of the first solid-state switch is connected with a third clutch, a first DC converter, a first reversible motor and a second end of the fourth solid-state switch respectively; a second end of the first solid-state switch is connected with a second clutch, a fourth DC converter, a second reversible motor and a first end of the second solid-state switch respectively; a second end of the second solid-state switch is connected with a first end of the third solid-state switch; a second end of the third solid-state switch is connected with a first end of the fourth solid-state switch; wherein the natural gas power module provides electric energy to the ship gearbox or the lithium iron phosphate battery power module through the first clutch; electric energy in the multi-source flexible DC loop network provides electric energy to the ship gearbox through the second clutch or the third clutch.

2. The system of claim 1, wherein, The natural gas power module comprises: an LNG storage tank; an LNG vaporizer, an input end of the LNG vaporizer being connected with an output end of the LNG storage tank; a one-way valve, a first end of the one-way valve being connected with an output end of the LNG vaporizer; a natural gas engine, a gas input end of the natural gas engine being connected with a second end of the one-way valve, an electric energy output end of the natural gas engine being connected with the ship gearbox through the first clutch.

3. The system of claim 1, wherein, The lithium iron phosphate battery power module comprises a first lithium iron phosphate battery power sub-module and a second lithium iron phosphate battery power sub-module; The first lithium iron phosphate battery power sub-module comprises a first lithium iron phosphate battery and the first DC converter, the first lithium iron phosphate battery being connected with the multi-source flexible DC loop network through the first DC converter; The second lithium iron phosphate battery power sub-module comprises a second lithium iron phosphate battery and a second DC converter, the second lithium iron phosphate battery being connected with the multi-source flexible DC loop network through the second DC converter; The hydrogen fuel cell power module comprises a first hydrogen fuel cell power sub-module and a second hydrogen fuel cell power sub-module; The first hydrogen fuel cell power sub-module comprises a first hydrogen fuel cell and a third DC converter, the first hydrogen fuel cell being connected with the multi-source flexible DC loop network through the third DC converter; The second hydrogen fuel cell power sub-module comprises a second hydrogen fuel cell and the fourth DC converter, the second hydrogen fuel cell being connected with the multi-source flexible DC loop network through the fourth DC converter.

4. The system of claim 3, wherein, The system further comprises a first manual switch, a second manual switch, a first automatic switch and a second automatic switch; The power supply end of the first manual switch is connected with the output end of the second DC converter; The power supply end of the second manual switch is connected with the output end of the first DC converter; The power supply end of the first automatic switch is connected with the output end of the third DC converter; The power supply end of the second automatic switch is connected with the output end of the fourth DC converter; The first manual switch, the first automatic switch, the second manual switch and the second automatic switch are connected in sequence to form the multi-source flexible DC looped network.

5. The system of claim 4, wherein, The system further comprises a first inverter and a second inverter; The first end of the first inverter is connected with the first automatic switch, the second end of the first inverter is connected with the first end of the first reversible motor, and the second end of the first reversible motor is connected with the ship gearbox through the third clutch; The first end of the second inverter is connected with the second automatic switch, the second end of the second inverter is connected with the first end of the second reversible motor, and the second end of the second reversible motor is connected with the ship gearbox through the second clutch.

6. The system of claim 5, wherein, The system further comprises a third inverter and a fourth inverter; The first end of the third inverter is connected with the first manual switch, and the second end of the third inverter is connected with the ship load; The first end of the fourth inverter is connected with the second manual switch, and the second end of the fourth inverter is connected with the ship load.

7. The system of claim 6, wherein, The system further comprises a fifth inverter and a sixth inverter; The first end of the fifth inverter is connected with the first DC converter, and the second end of the fifth inverter is connected with the preset load; The first end of the sixth inverter is connected with the second DC converter, and the second end of the sixth inverter is connected with the preset load.

8. A control method of a ship hybrid power system based on a multi-source flexible DC ring network, characterized in that, The method comprises the following steps: Obtaining the ship working mode; Controlling the working state of the system according to the ship working mode.

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