Ship hybrid power system based on multi-source flexible direct-current looped network and control method thereof

Abstract

The embodiment of the invention discloses a ship hybrid power system based on a multi-source flexible direct-current looped network and a control method of the ship hybrid power system, and can be applied to the technical field of ship control. According to the system, after the natural gas power module, the hydrogen fuel cell power module and the lithium iron phosphate battery power module are arranged, the natural gas power module is connected with the ship gearbox through the first clutch, so that the state that the natural gas power module outputs power to the ship is controlled through the on-off state of the first clutch; meanwhile, the hydrogen fuel cell power module and the lithium iron phosphate battery power module are connected with the multi-source flexible direct-current looped network, so that the states of outputting power to the ship gearbox by the hydrogen fuel cell power module and the lithium iron phosphate battery power module can be controlled through the on-off states of a second clutch and a third clutch; therefore, various multi-source hybrid power modes can be provided for the ship, and the problems that a pure natural gas engine is insufficient in power and a pure electric ship is short in endurance mileage are effectively solved.

Description

Technical Field

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

[0002] In the relevant technology, natural gas is used as fuel for ship engines, and its advantages include abundant resources, low emission pollution, and low price. The main component of natural gas is methane, which is a gaseous fuel that can be fully mixed with air. Therefore, there is basically no particulate emission after combustion, and the amount of CO generated after combustion is also very small. Compared with other fossil fuels, it produces the least pollutant emissions during the entire life cycle of mining, production, storage, transportation, and use, but it has disadvantages such as low energy density, resulting in insufficient power for ship engines when pure natural gas is used to provide power. Compared with traditional fuel ships, pure electric ship power systems have the advantages of zero emissions, simple ship structure, higher transmission efficiency, and low operating costs, but the cruising range is shorter.

[0003] In summary, the technical problems existing in the relevant technologies need to be improved. Summary of the invention

[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 engines and short cruising range of pure electric ships.

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

[0006] A natural gas power module, wherein the natural gas power module is connected to a ship gearbox via a first clutch, and the ship gearbox is connected to a ship propeller;

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

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

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

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

[0011] LNG storage tanks;

[0012] An LNG vaporizer, wherein an input end of the LNG vaporizer is connected to an output end of the LNG liquid storage tank;

[0013] a one-way valve, a first end of which is connected to an output end of the LNG vaporizer;

[0014] A natural gas engine, wherein the gas input end of the natural gas engine is connected to the second end of the one-way valve, and the electric energy output end of the natural gas engine is connected to the ship gearbox through the first clutch.

[0015] In some embodiments, the lithium iron phosphate battery power module includes a first lithium iron phosphate battery power submodule and a second lithium iron phosphate battery power submodule;

[0016] The first lithium iron phosphate battery power submodule includes a first lithium iron phosphate battery and a first DC converter, and the first lithium iron phosphate battery is connected to the multi-source flexible DC ring network through the first DC converter;

[0017] The second lithium iron phosphate battery power submodule includes a second lithium iron phosphate battery and a second DC converter, and the second lithium iron phosphate battery is connected to the multi-source flexible DC ring network through the second DC converter;

[0018] The hydrogen fuel cell power module includes a first hydrogen fuel cell power submodule and a second hydrogen fuel cell power submodule;

[0019] The first hydrogen fuel cell power submodule includes a first hydrogen fuel cell and a third DC converter, and the first hydrogen fuel cell is connected to the multi-source flexible DC ring network through the third DC converter;

[0020] The second hydrogen fuel cell power submodule includes a second hydrogen fuel cell and a fourth DC converter, and the second hydrogen fuel cell is connected to the multi-source flexible DC ring network through the fourth DC 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] The power supply end of the first manual switch is connected to the output end of the second DC converter;

[0023] The power supply end of the second manual switch is connected to the output end of the first DC converter;

[0024] The power supply end of the first automatic switch is connected to the output end of the third DC converter;

[0025] The power supply terminal of the second automatic switch is connected to the output terminal of the fourth DC converter;

[0026] Among them, 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 ring network.

[0027] In some embodiments, the system further includes 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 to the first automatic switch, the second end of the first inverter is connected to the first end of the first reversible motor, and the second end of the first reversible motor is connected to the ship gearbox through the third clutch;

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

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

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

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

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

[0034] A first end of the fifth inverter is connected to the first DC converter, and a second end of the fifth inverter is connected to a preset load;

[0035] A first end of the sixth inverter is connected to the second DC converter, and a second end of the sixth inverter is connected to a preset load.

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

[0037] In some embodiments, the solid-state switch module includes 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 respectively connected to the third clutch, the first DC converter, the first reversible motor and the first end of the second solid-state switch;

[0039] The second end of the first solid-state switch is respectively connected to the second clutch, the fourth DC converter, the second reversible motor and the first end of the fourth solid-state switch;

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

[0041] The second end of the third solid-state switch is connected to the 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 for a ship hybrid power system based on a multi-source flexible DC ring network, the method comprising the following steps:

[0043] Get the ship working mode;

[0044] The working state of the above system is controlled according to the ship working mode.

[0045] The embodiments of the present application include at least the following beneficial effects: The present 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 present application is configured by respectively setting a natural gas power module, a hydrogen fuel cell power module and a lithium iron phosphate battery power module, and configuring the natural gas power module to be connected to the ship gearbox through a first clutch, so as to control the state of the natural gas power module outputting power to the ship through the switching state of the first clutch, and at the same time configuring the hydrogen fuel cell power module and the lithium iron phosphate battery power module to be connected to the multi-source flexible DC ring network, so that the state of the hydrogen fuel cell power module and the lithium iron phosphate battery power module outputting power to the ship gearbox can be controlled through the switching states of the second clutch and the third clutch, thereby providing a variety of multi-source hybrid power modes for ships, effectively solving the problems of insufficient power of pure natural gas engines and short cruising range of pure electric ships. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

[0048] It is understood that the terms "first", "second", etc. used in this application can be used to describe various concepts in this article, but unless otherwise specified, 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 the embodiment of the present application, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Depending on the context, the words "if" and "if" as used herein can be interpreted as "at the time of" or "when" or "in response to determination".

[0049] The terms "at least one", "multiple", "each", "any", etc. used in this application, at least one includes one, two or more, multiple includes two or more, 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 those commonly understood by those skilled in the art to which this application belongs. The terms used herein are only for the purpose of describing the embodiments of this application and are not intended to limit this application.

[0051] Before describing the embodiments of the present application in detail, some nouns and terms involved in the embodiments of the present application are first described. The nouns and terms involved in the embodiments of the present application are subject to the following interpretations:

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

[0053] In an embodiment of the present application, a ship hybrid power system based on a multi-source flexible DC ring network and a control method thereof are provided. The system of this embodiment is configured by respectively setting a natural gas power module, a hydrogen fuel cell power module and a lithium iron phosphate battery power module, and arranging the natural gas power module to be connected to the ship gearbox through a first clutch, so as to control the state of the natural gas power module outputting power to the ship through the switching state of the first clutch, and at the same time, the hydrogen fuel cell power module and the lithium iron phosphate battery power module are both connected to the multi-source flexible DC ring network, so that the state of the hydrogen fuel cell power module and the lithium iron phosphate battery power module outputting power to the ship gearbox can be controlled through the switching state of the second clutch and the third clutch, thereby providing a variety of multi-source hybrid power modes for the ship, effectively solving the problems of insufficient power of pure natural gas engines and short cruising range of pure electric ships.

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

[0055] It can be understood that the natural gas power module of the embodiment of the present 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 to the output end of the LNG storage tank 151, the first end of the one-way valve 131 is connected to the output end of the LNG vaporizer 141, the gas input end of the natural gas engine 101 is connected to the second end of the one-way valve 131, and the power output end of the natural gas engine 101 is connected to the ship gearbox 301 through the first clutch 20a. Specifically, the LNG storage tank is used to store liquefied natural gas. When it is necessary to provide power to the ship gear, after the one-way valve is controlled to open and the first clutch is connected, the liquefied natural gas stored in the LNG storage tank is transported to the LNG vaporizer, and the gas after gasification by the LNG vaporizer is transported to the natural gas engine, so that after the natural gas engine works and transmits electric energy to the ship gearbox, the ship gearbox is controlled to work and then the ship propeller 401 is driven to drive the ship to move.

[0056] In an embodiment of the present application, a lithium iron phosphate battery power module includes a first lithium iron phosphate battery power submodule and a second lithium iron phosphate battery power submodule; the first lithium iron phosphate battery power submodule includes a first lithium iron phosphate battery 11a and a first DC converter 10a, and the first lithium iron phosphate battery 11a is connected to a multi-source flexible DC ring network through the first DC converter 10a; the second lithium iron phosphate battery power submodule includes a second lithium iron phosphate battery 11b and a second DC converter 10b; the second lithium iron phosphate battery 11b is connected to a multi-source flexible DC ring network through the second DC converter 10b; the hydrogen fuel cell power module includes a first hydrogen fuel cell power submodule and a second hydrogen fuel cell power submodule; the first hydrogen fuel cell power submodule includes a first hydrogen fuel cell 12a and a third DC converter 10c, and the first hydrogen fuel cell 12a is connected to a multi-source flexible DC ring network through the third DC converter 10c; the second hydrogen fuel cell power submodule includes a second hydrogen fuel cell 12b and a fourth DC converter 10d, and the second hydrogen fuel cell 12b is connected to a multi-source flexible DC ring network through the fourth DC converter 10d. Specifically, when driving power is provided to the ship through a lithium iron phosphate battery power module or a hydrogen fuel cell power module, after controlling the second clutch and the third clutch to be connected, the first DC converter boosts the DC voltage in the first lithium iron phosphate battery and transmits it to the multi-source flexible DC ring network, or the second DC converter boosts the DC voltage in the second lithium iron phosphate battery and transmits it to the multi-source flexible DC ring network, or the third DC converter boosts the DC voltage in the first hydrogen fuel cell and transmits it to the multi-source flexible DC ring network, or the fourth DC converter boosts the DC voltage in the second hydrogen fuel cell and transmits it to the multi-source flexible DC ring network, and then the driving power is transmitted to the ship through the multi-source flexible DC ring network, thereby controlling the movement process of the ship.

[0057] In the embodiments of the present application, Figure 1The system shown 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 to the output end of the second DC converter 10b; the power supply end of the second manual switch 80b is connected to the output end of the first DC converter 10a; the power supply end of the first automatic switch 90a is connected to the output end of the third DC converter 10c; the power supply end of the second automatic switch 90b is connected to 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 ring network. Specifically, the multi-source flexible DC ring network formed in this embodiment can integrate the power transmission and distribution functions of multiple energy sources, and realizes multi-path transmission of power through multi-point power supply and ring network structure. In this embodiment, the multi-source flexible DC ring network is applied to the ship multi-energy hybrid power system to achieve energy integration and load optimization. It can be understood that the manual switch of this embodiment can control the on and off of the switch according to the operating status of the staff; the automatic switch can automatically control the on and off of the switch according to the control instruction triggered by the control end.

[0058] In the embodiments of the present application, Figure 1 The system shown 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 to the first automatic switch 90a, the second end of the first inverter 70a is connected to the first end of the first reversible motor 60a, and the second end of the first reversible motor 60a is connected to the ship gearbox through the third clutch 20c; the first end of the second inverter 70b is connected to the second automatic switch 90b, the second end of the second inverter 70b is connected to the first end of the second reversible motor 60b, and the second end of the second reversible motor 60b is connected to the ship gearbox 301 through the second clutch 20b. Specifically, the working modes of the first reversible motor and the second reversible motor include a power generation mode and a charging mode. It is understandable that when the lithium iron phosphate battery in the lithium iron phosphate battery power module is powered, 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 the electric energy in the power grid to the first reversible motor and the second reversible motor, and can also transmit the electric energy generated by the first reversible motor and the second reversible motor in the power generation mode to the power grid, and then use the lithium iron phosphate battery to store the electric energy. 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. Among them, when the lithium iron phosphate battery is charged, the natural gas power module can be used to charge the lithium iron phosphate battery.

[0059] In the embodiments of the present application, Figure 1The system shown also includes a third inverter 70c and a fourth inverter 70d; a first end of the third inverter 70c is connected to the first manual switch 80a, and a second end of the third inverter 70c is connected to the ship load; a first end of the fourth inverter 70d is connected to the second manual switch 80b, and a second end of the fourth inverter 70d is connected to the ship load. In this embodiment, the third inverter and the fourth inverter provide AC power to the ship load, so as to maintain a stable operation process of the ship load.

[0060] In the embodiments of the present application, Figure 1 The system shown also includes a fifth inverter 70e and a sixth inverter 70f; a first end of the fifth inverter 70e is connected to the first DC converter 10a, and a second end of the fifth inverter 70e is connected to a preset load; a first end of the sixth inverter 70f is connected to the second DC converter 10b, and a second end of the sixth inverter 70f is connected to a preset load. In this embodiment, the fifth inverter and the sixth inverter are used to provide AC power for daily loads on the ship, thereby maintaining a stable operation process of daily loads on the ship.

[0061] In the embodiments of the present application, Figure 1 The system shown 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 connected or disconnected to achieve a flexible connection process between the power source 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 respectively connected to 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; the second end of the first solid-state switch 50a is respectively connected to 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; the second end of the second solid-state switch 50b is connected to the first end of the third solid-state switch 50c; the second end of the third solid-state switch 50c is connected to the second end of the fourth solid-state switch 50d. In this embodiment, multiple solid-state switches are connected, so that when a fault is detected in a part of the line, the faulty line can be quickly disconnected and isolated to ensure the normal operation of other parts.

[0063] It can be understood that, based on the connection relationship between the various components in the above system, the system of the present application can realize 4 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 engaged, the second clutch and the third clutch between the gearbox and the first reversible motor and the second reversible motor are disengaged, the one-way valve is opened, and the liquefied natural gas in the LNG storage tank is vaporized by the LNG vaporizer and then transported to the natural gas engine. The natural gas engine is running, and the ship's propeller is driven solely by the natural gas engine.

[0065] The second is a pure electric propulsion mode, in which the first clutch between the natural gas engine and the gearbox is disengaged, and the second clutch and the third clutch between the gearbox and the first reversible motor and the second reversible motor are engaged. The first reversible motor and the second reversible motor are in electric motor mode, and the electric energy required for their operation is supplied by the first lithium iron phosphate battery and the second lithium iron phosphate battery via the first DC converter and the second DC converter into the ring network, and is provided by the first automatic switch, the second automatic switch, the first inverter and the second inverter, or by the first hydrogen fuel cell and the second hydrogen fuel cell via the third DC converter and the fourth DC converter into the ring network, and is provided by the first automatic switch, the second automatic switch, the first inverter and the second inverter. The propeller is driven separately by the first reversible motor and the second reversible motor.

[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 one-way valve is opened, and the liquefied natural gas in the LNG storage tank is vaporized by the LNG vaporizer and then transported to the natural gas engine to operate the engine. The first reversible motor and the second reversible motor are both electric motor modes, and the electric energy required for their operation is supplied by the first lithium iron phosphate battery and the second lithium iron phosphate battery through the first DC converter and the second DC converter into the ring network, and supplied by the first automatic switch, the second automatic switch, the first inverter, and the second inverter, or by the first hydrogen fuel cell and the second hydrogen fuel cell through the third DC converter and the fourth DC converter into the ring network, and supplied by the first automatic switch, the second automatic switch, the first inverter, and the second inverter, and the propeller is driven by the natural gas engine and the first reversible motor and the second reversible motor in parallel.

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

[0068] It can be seen from the above that the system provided by the embodiment of the present application can not only select the most appropriate energy use strategy under different working conditions and improve energy utilization efficiency by integrating multiple energy types, but also solve the problems of insufficient endurance and poor power of pure electric ships and the poor dynamic response of pure mechanical ship power systems with natural gas engines as the only power source. The multi-source flexible DC ring network realizes multi-path transmission of electricity through multi-point power supply and ring network structure. Even if there is a problem with a certain line, other paths can still work normally to ensure the stability of the system. In addition, the present application can also monitor and dispatch the output of each power supply in real time through an intelligent energy management system, automatically adjust power distribution according to demand, and optimize energy utilization efficiency.

[0069] In addition, the embodiment of the present application also provides a control method for a ship hybrid power system based on a multi-source flexible DC ring network, the method comprising the following steps:

[0070] Get the ship working mode;

[0071] Control according to ship working mode Figure 1 The working status of the system is shown.

[0072] It can be understood that when controlling the above system to work, the embodiment of the present application can achieve the beneficial effects shown in the above system.

[0073] The embodiments described in the embodiments of the present application are intended 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 in the embodiments of the present application. Those skilled in the art will appreciate that with the evolution of technology and the emergence of new application scenarios, the technical solutions provided in the embodiments of the present application are also applicable to similar technical problems.

[0074] Those skilled in the art will appreciate that the technical solutions shown in the figures do not constitute a limitation on the embodiments of the present application, and may include more or fewer steps than shown in the figures, or a combination of certain steps, or different steps.

[0075] The device embodiments described above are merely illustrative, and the units described as separate components may or may not be physically separated, that is, they may be located in one place or distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0076] Those skilled in the art will appreciate that all or some of the steps in the methods disclosed above, and the functional modules / units in the systems and devices may be implemented as software, firmware, hardware, or a suitable combination thereof.

[0077] The terms "first", "second", "third", "fourth", etc. (if any) in the specification of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0078] It should be understood that in the present application, "at least one (item)" means one or more, and "plurality" means two or more. "And / or" is used to describe the association relationship of associated objects, indicating that three relationships may exist. For example, "A and / or B" can mean: only A exists, only B exists, and A and B exist at the same time, where A and B can be singular or plural. The character " / " generally indicates that the objects associated before and after are in an "or" relationship. "At least one of the following" or similar expressions refers to any combination of these items, including any combination of single or plural 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, c can be single or multiple.

[0079] The preferred embodiments of the present invention are described above with reference to the accompanying drawings, but the scope of the rights of the present invention is not limited thereto. Any modification, equivalent substitution and improvement made by a person skilled in the art without departing from the scope and essence of the present invention should be within the scope of the rights of the present invention.

Claims

1. A ship hybrid power system based on a multi-source flexible DC ring network, characterized in that: The system comprises: A natural gas power module, wherein the natural gas power module is connected to a ship gearbox via a first clutch, and the ship gearbox is connected to a ship propeller; A hydrogen fuel cell power module, wherein the hydrogen fuel cell power module is connected to a multi-source flexible DC ring network; A lithium iron phosphate battery power module, wherein the lithium iron phosphate battery power module is connected to the multi-source flexible DC ring network; Among them, the natural gas power module provides electrical energy to the ship gearbox or the lithium iron phosphate battery power module through the first clutch; the electrical energy in the multi-source flexible DC ring network provides electrical energy to the ship gearbox through the second clutch or the third clutch.

2. The method according to claim 1, characterized in that The natural gas power module comprises: LNG storage tanks; An LNG vaporizer, wherein an input end of the LNG vaporizer is connected to an output end of the LNG liquid storage tank; a one-way valve, a first end of which is connected to an output end of the LNG vaporizer; A natural gas engine, wherein the gas input end of the natural gas engine is connected to the second end of the one-way valve, and the electric energy output end of the natural gas engine is connected to the ship gearbox through the first clutch.

3. The system according to claim 1, characterized in that The lithium iron phosphate battery power module includes a first lithium iron phosphate battery power submodule and a second lithium iron phosphate battery power submodule; The first lithium iron phosphate battery power submodule includes a first lithium iron phosphate battery and a first DC converter, and the first lithium iron phosphate battery is connected to the multi-source flexible DC ring network through the first DC converter; The second lithium iron phosphate battery power submodule includes a second lithium iron phosphate battery and a second DC converter, and the second lithium iron phosphate battery is connected to the multi-source flexible DC ring network through the second DC converter; The hydrogen fuel cell power module includes a first hydrogen fuel cell power submodule and a second hydrogen fuel cell power submodule; The first hydrogen fuel cell power submodule includes a first hydrogen fuel cell and a third DC converter, and the first hydrogen fuel cell is connected to the multi-source flexible DC ring network through the third DC converter; The second hydrogen fuel cell power submodule includes a second hydrogen fuel cell and a fourth DC converter, and the second hydrogen fuel cell is connected to the multi-source flexible DC ring network through the fourth DC converter.

4. The system according to claim 3, characterized in that 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 to the output end of the second DC converter; The power supply end of the second manual switch is connected to the output end of the first DC converter; The power supply end of the first automatic switch is connected to the output end of the third DC converter; The power supply terminal of the second automatic switch is connected to the output terminal of the fourth DC converter; Among them, 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 ring network.

5. The system according to claim 4, characterized in that The system further includes a first reversible motor, a second reversible motor, a first inverter, and a second inverter; The first end of the first inverter is connected to the first automatic switch, the second end of the first inverter is connected to the first end of the first reversible motor, and the second end of the first reversible motor is connected to the ship gearbox through the third clutch; The first end of the second inverter is connected to the second automatic switch, the second end of the second inverter is connected to the first end of the second reversible motor, and the second end of the second reversible motor is connected to the ship gearbox through the second clutch.

6. The system according to claim 5, characterized in that The system further includes a third inverter and a fourth inverter; The first end of the third inverter is connected to the first manual switch, and the second end of the third inverter is connected to the ship load; A first end of the fourth inverter is connected to the second manual switch, and a second end of the fourth inverter is connected to a ship load.

7. The system according to claim 6, characterized in that The system further includes a fifth inverter and a sixth inverter; A first end of the fifth inverter is connected to the first DC converter, and a second end of the fifth inverter is connected to a preset load; A first end of the sixth inverter is connected to the second DC converter, and a second end of the sixth inverter is connected to a preset load.

8. The system according to claim 1, characterized in that The system also includes a solid-state switch module for controlling a flow path of electrical energy.

9. The system according to claim 8, characterized in that The solid-state switch module includes a first solid-state switch, a second solid-state switch, a third solid-state switch and a fourth solid-state switch; The first end of the first solid-state switch is respectively connected to the third clutch, the first DC converter, the first reversible motor and the first end of the second solid-state switch; The second end of the first solid-state switch is respectively connected to the second clutch, the fourth DC converter, the second reversible motor and the first end of the fourth solid-state switch; The second end of the second solid-state switch is connected to the first end of the third solid-state switch; The second end of the third solid-state switch is connected to the second end of the fourth solid-state switch.

10. A control method for a ship hybrid power system based on a multi-source flexible DC ring network, characterized in that: The method comprises the following steps: Get the ship working mode; The working state of the system according to any one of claims 1 to 9 is controlled according to the ship working mode.

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