CN108639299B - Gas-electric series-parallel ship hybrid power system with fuel cell - Google Patents
Gas-electric series-parallel ship hybrid power system with fuel cell Download PDFInfo
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- CN108639299B CN108639299B CN201810188706.3A CN201810188706A CN108639299B CN 108639299 B CN108639299 B CN 108639299B CN 201810188706 A CN201810188706 A CN 201810188706A CN 108639299 B CN108639299 B CN 108639299B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63H—MARINE PROPULSION OR STEERING
- B63H21/00—Use of propulsion power plant or units on vessels
- B63H21/20—Use of propulsion power plant or units on vessels the vessels being powered by combinations of different types of propulsion units
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63H—MARINE PROPULSION OR STEERING
- B63H21/00—Use of propulsion power plant or units on vessels
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T70/00—Maritime or waterways transport
- Y02T70/50—Measures to reduce greenhouse gas emissions related to the propulsion system
- Y02T70/5218—Less carbon-intensive fuels, e.g. natural gas, biofuels
Abstract
The invention aims to provide a gas-electric series-parallel type ship hybrid power system with a fuel cell, which comprises a gas machine, a motor and a generator, wherein the output end of the gas machine is connected with a first input end of a gear box through a permanent magnet coupler, the output end of the motor is connected with a second input end of the gear box through a first clutch, the input end of the generator is connected with a first output end of the gear box through a second clutch, a second output end of the gear box is connected with a propeller, a liquefied natural gas tank is connected with a gas supply device, the gas supply device is connected with the gas machine and the fuel cell, a storage battery, a ship load, an inverter and a rectifier are all electrically connected with a distribution board, the inverter is electrically connected with the motor through a frequency converter, and the generator is electrically connected with the rectifier. The invention further improves the operation efficiency of the gas engine and the motor, effectively reduces the fuel consumption and the emission of the gas engine, and simultaneously improves the dynamic response of the ship.
Description
Technical Field
The invention relates to a power system, in particular to a ship power system.
Background
With the increasingly severe energy problems and environmental problems in China and the rapid rise of international oil prices, higher requirements are put forward on the economy and emission performance of ships, and the energy-saving and emission-reducing technology of ships becomes one of the hot spots of attention and research of people.
Natural gas is the inevitable trend of future ship engine development as the fuel of engine, and natural gas has the advantages of green environmental protection, economy, safety and reliability. But the natural gas engine has the defects of poor power response, insufficient power and the like due to the limitation of low technical level of the natural gas engine at the present stage.
The fuel cell is a power generation device which has high power generation efficiency, small environmental pollution, high specific energy, low noise, high reliability and easy construction, and is a new direction for the electric propulsion of ships in the future. However, because the technology is not mature at present, the fuel cell has the disadvantages of slow start, difficult storage and supply of fuel, low power density, etc.
The pure electric ship electric propulsion system is the leading edge of future ship technical research, and has the advantages of good economy, maneuverability, safety, low noise, low pollution and the like. However, under the influence of the power generation mode, power density and energy storage technology, the current pure electric ship cannot achieve high-performance speed, acceleration and self-control, and the cruising ability of the pure electric ship is limited by the battery capacity of the pure electric ship.
The hybrid power technology of the ship is helpful for solving the contradiction between the energy problem and the technology immaturity, and provides a feasible scheme for the transition of the traditional internal combustion engine propulsion mode to the pure electric propulsion mode of the ship. Simultaneously, hybrid boats and ships have the advantage that internal-combustion engine impels boats and ships and pure electric propulsion boats and ships concurrently: compared with an internal combustion engine for propelling a ship, the internal combustion engine can select the working mode according to the load, so that the fuel economy under all working conditions is ensured, and the redundancy is good; compared with a pure electric propulsion ship, the initial investment cost is low, and the cruising ability is strong. Therefore, the development of hybrid ships is of great significance.
Disclosure of Invention
The invention aims to provide a gas-electric hybrid ship hybrid power system with a fuel cell, which improves the dynamic property, the economical efficiency and the emission property of a ship.
The purpose of the invention is realized as follows:
the invention relates to a gas-electric series-parallel ship hybrid power system with a fuel cell, which is characterized in that: the gas generator comprises a gas generator, a motor, a generator, a fuel cell, a gear box, the output of gas generator passes through permanent magnet coupler and links to each other with the first input of gear box, the output of motor passes through first clutch and links to each other with the second input of gear box, the input of generator passes through the second clutch and links to each other with the first output of gear box, the second output of gear box links to each other with the screw, liquefied natural gas jar links to each other with gaseous feed arrangement, gaseous feed arrangement links to each other in gas generator and the fuel cell, the battery, boats and ships load, the dc-to-ac converter, the rectifier all links to each other with the distribution panel electricity, the inverter passes through the converter and links to each other with the motor electricity, the generator links to each other with the rectifier electricity, set up the third clutch between the gear of being connected with the screw in the gear box and the gear of being connected with permanent magnet coupler.
The present invention may further comprise:
1. the working modes of the gas engine, the motor, the generator and the fuel cell comprise a mechanical propulsion mode;
the mechanical propulsion mode comprises: a gas engine propulsion mode and a gas engine propulsion auxiliary power generation mode;
(1) gas engine propulsion mode: the gas engine is in a running state, the permanent magnet coupler is closed, the third clutch is closed, the first clutch and the second clutch are disconnected, and the gas engine drives the propeller to run;
(2) gas engine propulsion assisted power generation mode: the gas machine and the generator are in a running state, the permanent magnet coupler is closed, the second clutch and the third clutch are closed, the first clutch is disconnected, the gas machine drives the propeller to run and simultaneously drives the generator to generate electricity, and the electricity is collected into the distribution board through the rectifier.
2. The operating modes of the gas engine, the electric motor, the generator and the fuel cell comprise an electric propulsion mode;
the electric propulsion mode comprises: a fuel cell propulsion mode, a storage battery propulsion mode, a gas engine series propulsion mode, a hybrid power supply propulsion mode and a shore power charging mode;
(1) fuel cell propulsion mode: the motor is in a running state, the required electric power is provided by the fuel cell, and is input through the inverter and the frequency converter after being converged into the distribution board, the permanent magnet coupler is disconnected, the first clutch is closed, the second clutch and the third clutch are disconnected, and the motor drives the propeller to run;
(2) battery propulsion mode: the motor is in a running state, the required electric power is provided by the storage battery, is input through the inverter and the frequency converter after being gathered in the distribution board, the permanent magnet coupler is disconnected, the first clutch is closed, the second clutch and the third clutch are disconnected, and the motor drives the propeller to run;
(3) hybrid electric propulsion mode: the motor is in a running state, the required electric power is provided by the fuel cell and the storage battery, and is input through the inverter and the frequency converter after being gathered into the distribution board, the permanent magnet coupler is disconnected, the first clutch is closed, the second clutch and the third clutch are disconnected, and the propeller is driven by the motor to run;
(4) gas machine tandem propulsion mode: the gas machine, the motor and the generator are in a running state, the required electric power is provided by driving the generator and the fuel cell by the gas machine, the electric power is converged into a distribution board by the rectifier and then is input by the inverter and the frequency converter, the permanent magnet coupler is closed, the first clutch and the second clutch are closed, the third clutch is opened, and the motor drives the propeller to run;
(5) shore power charging mode: when the ship stops at a port and a shore, the external power supply charges the storage battery.
3. The working modes of the gas engine, the motor, the generator and the fuel cell comprise a hybrid propulsion mode;
the hybrid propulsion mode includes: a gas-electricity hybrid propulsion mode and a gas-electricity hybrid propulsion auxiliary power generation mode;
(1) gas-electric hybrid propulsion mode: the gas engine and the motor are in a running state, the required electric power is provided by a fuel cell and a storage battery, the electric power is input through an inverter and a frequency converter after being gathered into a distribution board, the permanent magnet coupler is closed, the first clutch and the third clutch are closed, the second clutch is disconnected, and the gas engine and the motor drive the propeller to run together;
(2) gas-electric hybrid propulsion auxiliary power generation mode: the gas machine, the motor and the generator are in a running state, the required electric power is provided by driving the generator by the gas machine, the electric power is converged into a distribution board by the rectifier and then is input by the inverter and the frequency converter, the permanent magnet coupler and the first-third clutches are closed, and the gas machine and the motor drive the propeller to run together.
4. The gas engine is a natural gas engine or a dual-fuel engine, the motor and the generator are permanent magnet motors, the fuel cell is a molten carbonate type fuel cell or a solid oxide type fuel cell or a phosphoric acid type fuel cell which can directly use natural gas as fuel, and the storage battery is a lead-acid storage battery or a lithium ion battery.
The invention has the advantages that:
1. the invention provides a gas-electricity series-parallel ship hybrid power system with a fuel cell, which is provided with a gas machine, a motor and a generator, has wide power coverage range, can meet the power requirements of ships under various working conditions, and enables the gas machine, the motor and the generator to better work in a high-efficiency area, thereby reducing the fuel consumption of the gas machine, improving the economy and the emission of the ships, effectively improving the power response of the ships during navigation, and improving the acceleration and deceleration performance and the ship backing performance of the ships.
2. The gas supply requirement of the gas engine in combination with the fuel cell is more optimized with respect to the cost when only the gas engine or the fuel cell is arranged. Meanwhile, the fuel cell and the storage battery are combined to be used as a power supply device, the storage battery makes up the defects that the power response of the fuel cell is poor and the fuel cell cannot be charged, the fuel cell makes up the defects of low capacity and low efficiency of the storage battery, and the service life of the storage battery can be effectively prolonged.
3. The gas engine and the gear box are connected by adopting the permanent magnet coupler instead of a traditional clutch, so that flexible parallel operation of the gas engine is realized, impact and vibration of the gas engine during parallel operation are effectively improved, the service life of the gas engine is prolonged, and although the permanent magnet coupler is slower in power response compared with the clutch, the permanent magnet coupler can be used in a hybrid power system well to avoid the defect.
4. The hybrid power system provided by the invention can realize various working modes, effectively improves the efficiency of the ship hybrid power system, and can select a proper working mode according to the actual power demand and the ship navigation environment. The scheme not only can meet the emission standards of different ports and sea areas, but also can effectively relieve the contradiction between the immature technology and the increasingly strict emission standard, and improves the economy and the emission performance of the ship.
5. The ship hybrid power system provided by the system has the advantages that a diesel auxiliary engine for power generation is not needed to be installed on a ship, the power supply of a ship load can be mainly replaced by a fuel cell and a generator, and a storage battery can be used for replacing in emergency, so that the space of a cabin can be effectively saved, and a certain initial investment can be reduced.
Drawings
FIG. 1 is a schematic structural view of the present invention;
fig. 2 is a simplified diagram of a gearbox.
Detailed Description
The invention will now be described in more detail by way of example with reference to the accompanying drawings in which:
referring to fig. 1-2, the gas-electric hybrid ship hybrid power system with a fuel cell of the present invention comprises a gas engine 1, a permanent magnet coupler 2, a motor 3, clutches 4, 5a and 7, a gear box 5, a generator 6, a propeller 8, a liquefied natural gas tank 9, a gas supply device 10, a gas valve 11, a fuel cell 12, a storage battery 13, a charging plug 14, a ship load 15, a distribution board 16, an inverter 17, a frequency converter 18, and a rectifier 19. The connection relationship is as follows: the output end of the gas machine 1 is connected with one input end of a gear box 5 through a permanent magnet coupler 2, the output end of a motor 3 is connected with the other input end of the gear box 5 through a clutch 4, the input end of a generator 6 is connected with one output end of the gear box 5 through a clutch 7, the other output end of the gear box 5 is connected with a propeller 8, a liquefied natural gas tank 9 is in gas connection with a gas supply device 10 and conveys natural gas to the gas machine 1 and a fuel cell 12 through a gas valve 11, the fuel cell 12, a storage battery 13, a ship load 15, an inverter 17 and a rectifier 19 are all electrically connected with a distribution board 16 through switches, the inverter 17 is electrically connected with the motor 3 through a frequency converter 18, the generator 6 is electrically connected with the rectifier 19, and the storage battery 13 is provided with a plug 14 capable of being externally charged.
In this embodiment, the gas engine 1 is preferably a pure natural gas engine or a dual-fuel engine, the electric motor 3 and the electric generator 6 are preferably a permanent magnet motor having advantages of high efficiency, high power density, long life, and the like, the fuel cell 12 is preferably a molten carbonate type fuel cell or a solid oxide type fuel cell or a phosphoric acid type fuel cell that can directly use natural gas as fuel, and the battery 13 is preferably a lead-acid battery with low cost and good reliability or a lithium ion battery with high power density and small volume and weight.
The structure of the gear box 5 illustrated in the present invention is not limited to a single gear box, but may be a power combining mechanism having a similar structure and function and composed of a plurality of gear boxes, and having a clutch 5 a.
The working modes of the invention mainly comprise a mechanical propulsion mode, an electric propulsion mode and a hybrid propulsion mode.
1. Mechanical propulsion mode
The mechanical propulsion modes can be divided into: a gas engine propulsion mode and a gas engine propulsion auxiliary power generation mode.
1) Gas engine propulsion mode: in this operating mode, the gas engine 1 is in an operating state, the permanent magnet coupler 2 is closed, the clutch 5a is closed, the clutches 4 and 7 are opened, and the propeller 8 is driven by the gas engine 1 to operate.
2) Gas engine propulsion assisted power generation mode: in this operating mode, the gas engine 1 and the generator 6 are in an operating state, the permanent magnet coupler 2 is closed, the clutches 5a and 7 are closed, the clutch 4 is opened, the gas engine 1 drives the propeller 8 to operate and simultaneously drives the generator 6 to generate electricity, and the electricity is collected into the distribution board 16 through the rectifier 19.
2. Electric propulsion mode
The electric propulsion modes can be divided into: fuel cell propulsion mode, battery propulsion mode, gas-machine series propulsion mode, hybrid-powered propulsion mode, shore power charging mode.
1) Fuel cell propulsion mode: in this operating mode, the motor 3 is in a running state, the required power is completely provided by the fuel cell 12, and is input through the inverter 17 and the frequency converter 18 after being input into the distribution board 16, the permanent magnet coupler 2 is disconnected, the clutch 4 is closed, the clutches 5a and 7 are disconnected, and the propeller 8 is driven by the motor 3 to run.
2) Battery propulsion mode: in this operating mode, the motor 3 is in a running state, the required power is completely provided by the storage battery 13, and is input through the inverter 17 and the frequency converter 18 after being converged into the distribution board 16, the permanent magnet coupler 2 is disconnected, the clutch 4 is closed, the clutches 5a and 7 are disconnected, and the propeller 8 is driven by the motor 3 to run.
3) Hybrid electric propulsion mode: in this operating mode, the motor 3 is in a running state, the required power is supplied by the fuel cell 12 and the storage battery 13, and is input through the inverter 17 and the frequency converter 18 after being converged into the distribution board 16, the permanent magnet coupler 2 is disconnected, the clutch 4 is closed, the clutches 5a and 7 are disconnected, and the propeller 8 is driven by the motor 3 to run.
4) Gas machine tandem propulsion mode: in this operating mode, the gas engine 1, the motor 3, and the generator 6 are in an operating state, the gas engine 1 drives the generator 6 and the fuel cell 12 to provide the required power, the required power is collected into the distribution board 16 through the rectifier 19 and then is input through the inverter 17 and the frequency converter 18, the permanent magnet coupler 2 is closed, the clutches 4 and 7 are closed, the clutch 5a is opened, and the motor 3 drives the propeller 8 to operate.
5) Shore power charging mode: when the ship is parked at a port or a shore, the storage battery 13 can be charged by an external power supply through the charging plug 14.
3. Hybrid propulsion mode
The hybrid propulsion modes can be divided into: a gas-electricity hybrid propulsion mode and a gas-electricity hybrid propulsion auxiliary power generation mode.
1) Gas-electric hybrid propulsion mode: in the working mode, the gas engine 1 and the motor 3 are in a running state, the required power is provided by the fuel cell 12 and the storage battery 13, the power is input into the distribution board 16 through the inverter 17 and the frequency converter 18, the permanent magnet coupler 2 is closed, the clutches 4 and 5a are closed, the clutch 7 is opened, and the gas engine 1 and the motor 3 drive the propeller 8 to run together.
2) Gas-electric hybrid propulsion auxiliary power generation mode: in the working mode, the gas engine 1, the motor 3 and the generator 6 are in a running state, the required electric power is provided by the generator 6 driven by the gas engine 1, and is collected into the distribution board 16 through the rectifier 19 and then is input through the inverter 17 and the frequency converter 18, the permanent magnet coupler and the clutch are both closed, and the propeller 8 is driven by the gas engine 1 and the motor 3 to run.
In the above mode: the mechanical propulsion mode is suitable for the areas with low requirements on ship emission and noise when the ship enters the sea area for stable navigation after leaving a port or a wharf; the electric propulsion mode is suitable for areas where ships enter and exit ports or docks, ship acceleration and deceleration, ship backing, shore connection and high requirements for ship emission and noise are met; the hybrid propulsion mode is suitable for when the ship has a certain demand on propulsion power or navigational speed. Wherein the auxiliary power generation mode is adapted to be used when the fuel cell is not operating.
The ship hybrid power system provided by the invention can be used without arranging a ship diesel auxiliary engine for power generation, the power required by a ship load 15 is mainly provided by the fuel cell 12, the generator 6 can also provide partial power during auxiliary power generation, and the storage battery 13 is recommended to be used in case of emergency, so that the service life of the storage battery 13 is prolonged.
The number of generators and motors can be increased or decreased by taking into account the magnitude of the power actually required by the ship and the matching problem with the gas engine power.
The following table is a power configuration scheme of a ship at a fixed load, which is provided in this embodiment, and the power configuration scheme does not consider losses during energy flow conversion, and only represents a direction in which energy flows are distributed: the rated power of the gas engine is 900kW, the rated power of the motor is 600kW, the rated power of the generator is 600kW, the power of the fuel cell is 400kW, the total capacity of the storage battery is 400 kW.h (the power emitted when discharging at a discharge rate of 1C is 400kW, the power required when charging at a charge rate of 1/4C is 100kW, and C is coulomb), and the power consumed by the load of the ship is 200 kW. The power distribution of the system is shown in the table below when the gas engine, the motor and the generator are all operating in the high efficiency zone in different operating modes. Where S (Shaft power) represents shaft power, E (electric power) represents electric power, both in kW, + represents shaft power or electric power emitted by the component, + represents shaft power or electric power consumed by the component, \\ represents the component in a closed state.
A gas-electric hybrid propulsion mode as shown in the table, in which the gas engine 1, the electric motor 3 are in operation, the generator 6 is in off state, both the fuel cell 12 and the storage battery 13 are powered, the gas engine 1 emits shaft power of 900kW, the fuel cell 12 emits electric power of 400kW, the storage battery 13 emits electric power of 400kW, the electric motor 3 consumes electric power of 600kW and emits shaft power of 600kW, the ship load consumes electric power of 200kW, and finally the shaft power used for propulsion of the ship is 1500 kW.
Fig. 2 shows a combination of the gear box 5 in the simplified structure of fig. 1 according to the present invention. The combination form of a plurality of simple gear boxes can make structural arrangement more free, and spatial distribution is more reasonable to can match according to the power and increase more easily or reduce motor and generator platform number, make the matching of boat engine oar more nimble. But the energy loss will be a little increased and will also take up more cabin space.
Claims (3)
1. The utility model provides a take fuel cell's gas-electricity series-parallel connection formula boats and ships hybrid power system which characterized by: the gas generator comprises a gas machine, a motor, a generator, a fuel cell and a gear box, wherein the output end of the gas machine is connected with the first input end of the gear box through a permanent magnet coupler, the output end of the motor is connected with the second input end of the gear box through a first clutch, the input end of the generator is connected with the first output end of the gear box through a second clutch, the second output end of the gear box is connected with a propeller, a liquefied natural gas tank is connected with a gas supply device, the gas supply device is connected with the gas machine and the fuel cell, a storage battery, a ship load, an inverter and a rectifier are all electrically connected with a distribution board, the inverter is electrically connected with the motor through a frequency converter, the generator is electrically connected with the rectifier, and a third clutch is arranged between a gear connected with the propeller and a gear connected with the permanent magnet coupler in the gear box; the working modes of the gas engine, the motor, the generator and the fuel cell comprise a hybrid propulsion mode;
the hybrid propulsion mode includes: a gas-electricity hybrid propulsion mode and a gas-electricity hybrid propulsion auxiliary power generation mode;
(1) gas-electric hybrid propulsion mode: the gas engine and the motor are in a running state, the required electric power is provided by a fuel cell and a storage battery, the electric power is input through an inverter and a frequency converter after being gathered into a distribution board, the permanent magnet coupler is closed, the first clutch and the third clutch are closed, the second clutch is disconnected, and the gas engine and the motor drive the propeller to run together;
(2) gas-electric hybrid propulsion auxiliary power generation mode: the gas machine, the motor and the generator are in a running state, the required electric power is provided by driving the generator by the gas machine, the electric power is converged into a distribution board by the rectifier and then is input by the inverter and the frequency converter, the permanent magnet coupler and the first-third clutches are closed, and the gas machine and the motor drive the propeller to run together; the gas engine is a natural gas engine or a dual-fuel engine, the motor and the generator are permanent magnet motors, the fuel cell is a molten carbonate type fuel cell or a solid oxide type fuel cell or a phosphoric acid type fuel cell which can directly use natural gas as fuel, and the storage battery is a lead-acid storage battery or a lithium ion battery.
2. The gas-electric series-parallel ship hybrid power system with the fuel cell as set forth in claim 1, wherein: the working modes of the gas engine, the motor, the generator and the fuel cell comprise a mechanical propulsion mode;
the mechanical propulsion mode comprises: a gas engine propulsion mode and a gas engine propulsion auxiliary power generation mode;
(1) gas engine propulsion mode: the gas engine is in a running state, the permanent magnet coupler is closed, the third clutch is closed, the first clutch and the second clutch are disconnected, and the gas engine drives the propeller to run;
(2) gas engine propulsion assisted power generation mode: the gas machine and the generator are in a running state, the permanent magnet coupler is closed, the second clutch and the third clutch are closed, the first clutch is disconnected, the gas machine drives the propeller to run and simultaneously drives the generator to generate electricity, and the electricity is collected into the distribution board through the rectifier.
3. The gas-electric series-parallel ship hybrid power system with the fuel cell as set forth in claim 1, wherein: the operating modes of the gas engine, the electric motor, the generator and the fuel cell comprise an electric propulsion mode;
the electric propulsion mode comprises: a fuel cell propulsion mode, a storage battery propulsion mode, a gas engine series propulsion mode, a hybrid power supply propulsion mode and a shore power charging mode;
(1) fuel cell propulsion mode: the motor is in a running state, the required electric power is provided by the fuel cell, and is input through the inverter and the frequency converter after being converged into the distribution board, the permanent magnet coupler is disconnected, the first clutch is closed, the second clutch and the third clutch are disconnected, and the motor drives the propeller to run;
(2) battery propulsion mode: the motor is in a running state, the required electric power is provided by the storage battery, is input through the inverter and the frequency converter after being gathered in the distribution board, the permanent magnet coupler is disconnected, the first clutch is closed, the second clutch and the third clutch are disconnected, and the motor drives the propeller to run;
(3) hybrid electric propulsion mode: the motor is in a running state, the required electric power is provided by the fuel cell and the storage battery, and is input through the inverter and the frequency converter after being gathered into the distribution board, the permanent magnet coupler is disconnected, the first clutch is closed, the second clutch and the third clutch are disconnected, and the propeller is driven by the motor to run;
(4) gas machine tandem propulsion mode: the gas machine, the motor and the generator are in a running state, the required electric power is provided by driving the generator and the fuel cell by the gas machine, the electric power is converged into a distribution board by the rectifier and then is input by the inverter and the frequency converter, the permanent magnet coupler is closed, the first clutch and the second clutch are closed, the third clutch is opened, and the motor drives the propeller to run;
(5) shore power charging mode: when the ship stops at a port and a shore, the external power supply charges the storage battery.
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