CN109878677B - Power split-flow type gas-electricity hybrid ship power system - Google Patents
Power split-flow type gas-electricity hybrid ship power system Download PDFInfo
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- CN109878677B CN109878677B CN201910149499.5A CN201910149499A CN109878677B CN 109878677 B CN109878677 B CN 109878677B CN 201910149499 A CN201910149499 A CN 201910149499A CN 109878677 B CN109878677 B CN 109878677B
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Abstract
The invention aims to provide a power split type gas-electricity hybrid ship power system which comprises a gas engine, a generator, a motor, a gear box, a propeller and a natural gas storage and supply device. The output end of the first gas machine is connected with the input end of the first gear box through a clutch, power distribution is carried out through the gear box, the second gas machine and the third gas machine are respectively connected with the input end of the second gear box and the third gear box through the clutch, the generator is connected with the output end of the first gear box through the clutch, the first motor and the second motor are respectively connected with the first gear box and the second gear box, the propeller is directly connected with the output end of the motor, and the power source is a storage battery, a generator and a fuel cell. The invention can meet the requirements of the ship under various environments and working conditions, can keep the gas engine and the motor in a high-efficiency area all the time, reduces the fuel consumption and the emission of the gas engine, improves the dynamic response of the ship, and expands the seaworthiness area of the ship.
Description
Technical Field
The invention relates to a ship power system, in particular to a ship hybrid power system.
Background
With the rapid increase of the international oil price and the implementation of the stricter and stricter emission regulations, higher requirements are put forward on the economy and the emission performance of ships, and energy conservation and emission reduction become important tasks in national economic development. Ships are high-energy-consumption transportation tools, and the energy-saving and emission-reducing technology of the ships becomes one of hot spots of attention and research.
As a future environmental strategy we aimed at reducing energy consumption and reducing CO2, SOx, NOx and PM emissions. There are many ways to reduce pollution and emissions from ships, the best of which is to use alternative energy sources. 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 dynamic response, insufficient power and the like due to the limitation of low technical level of the natural gas engine at the present stage.
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 ship has the advantages of both an internal combustion engine propulsion ship and a pure electric propulsion ship: 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. The hybrid power technology of the ship solves the contradiction between the energy problem and the immature technology, realizes the high-efficiency utilization of fuel, and provides a feasible scheme for the transition from the traditional mechanical propulsion to the pure electric propulsion of the ship, so that the development of the hybrid power ship has great significance.
Disclosure of Invention
The invention aims to provide a power split type gas-electricity hybrid ship power system 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 discloses a power split type gas-electricity hybrid ship power system, which is characterized in that: the LNG storage tank comprises a first gas machine, a third gas machine, a first gear box, a third gear box, a first motor, a second motor, a generator and an LNG storage tank, wherein the first gear box comprises a first gear, a second gear, a fourth gear box, a sixth gear box, a fifth gear, a seventh gear, a ninth gear box, an eighth gear, a seventh gear, a ninth gear, a seventh gear, a fifth gear, a seventh gear, a sixth gear, a fifth gear, a seventh gear, a sixth gear, a fifth gear, a sixth gear, a third gear, a sixth gear, a LNG storage tank, a third gear, a fifth gear, a sixth gear, a seventh gear, a sixth gear, a seventh gear, a sixth gear, a seventh gear, a sixth gear, a seventh gear, a sixth gear, a seventh gear, a sixth gear, a seventh gear, a sixth gear, a fourth gear, a sixth gear, a fourth gear, a third gear, a fourth gear, a third gear, a fourth gear, a third gear, a fourth gear, a, the third gas machine is connected with a ninth gear through a seventh clutch, the second motor is connected with the ninth gear through an eighth clutch, the first propeller is connected with the first motor, the second propeller is connected with the second motor, the LNG liquid storage tank is respectively connected with the first gas machine, the second gas machine, the third gas machine and the fuel cell through the gasification heat exchanger, the storage battery and the generator are respectively connected with a ship power grid through respective power transformation devices, and the shore power device and the ship load are connected with the ship power grid.
The present invention may further comprise:
1. adopting a mechanical propulsion mode, wherein the mechanical propulsion mode comprises a gas engine propulsion mode and a gas engine auxiliary power generation propulsion mode;
gas engine propulsion mode: the fifth clutch is disconnected, other clutches are all closed, and the first propeller and the second propeller are driven by the first gas machine, the second gas machine and the third gas machine together; or the first clutch, the second clutch, the seventh clutch and the eighth clutch are closed, other clutches are opened, the power supplies of the first motor and the second motor are disconnected, and the first propeller and the second propeller are respectively driven by the second gas machine and the third gas machine; or the second clutch, the third clutch, the fourth clutch, the sixth clutch and the eighth clutch are closed, other clutches are disconnected, the power supplies of the first motor and the second motor are disconnected, and the first propeller and the second propeller are driven by the first gas engine;
auxiliary power generation propulsion mode of the gas engine: the clutch is closed completely, the first propeller and the second propeller are driven by part of power generated by the first gas machine, the second gas machine and the third gas machine together, the other part of power is used for driving the generator to generate power, and the generated power can be converged into a ship power grid; or the fourth clutch is disconnected, other clutches are closed, the power supplies of the first motor and the second motor are disconnected, the first propeller and the second propeller are respectively driven by a part of power generated by the second gas engine and the third gas engine, the other part of power is used for driving the generator to generate power, and the generated power can be converged into a ship power grid; or the first clutch and the seventh clutch are disconnected, other clutches are closed, the power supplies of the first motor and the second motor are disconnected, the first propeller and the second propeller are driven by part of power generated by the first gas engine, the other part of power is used for driving the generator to generate power, and the generated power can be converged into a ship power grid; or the third clutch and the sixth clutch are disconnected, other clutches are closed, the first propeller and the second propeller are driven by the second gas machine and the third gas machine, the generator is driven by the first gas machine alone, and the generated electricity can be converged into a ship power grid.
2. Employing electric propulsion modes including a battery propulsion mode, a fuel cell propulsion mode, a shore power charging mode;
battery propulsion mode: the second clutch and the eighth clutch are disconnected, the first propeller and the second propeller are driven by the first motor and the second motor, and electric energy required by the first motor and the second motor is provided by the storage battery through a ship power grid;
fuel cell propulsion mode: the second clutch and the eighth clutch are disconnected, the first propeller and the second propeller are driven by the first motor and the second motor, and electric energy required by the first motor and the second motor is provided by the fuel cell through a ship power grid;
shore power charging mode: when the ship stops at a port and a shore, the storage battery is charged by an external power supply of the shore power charging device.
3. Adopting a hybrid propulsion mode, wherein the hybrid propulsion mode comprises a gas engine and electric motor propulsion mode and a gas engine and electric motor auxiliary power generation propulsion mode;
gas machine + motor propulsion mode: the fifth clutch is disconnected, other clutches are all closed, the power supplies of the first motor and the second motor are connected, the first propeller and the second propeller are driven by the first gas machine, the second gas machine, the third gas machine, the first motor and the second motor together, and electric energy required by the first motor and the second motor is provided by a ship power grid;
or the fifth clutch is disconnected, the gas clutches are all closed, the power supply of the first motor is connected, the first propeller and the second propeller are driven by the first gas machine, the second gas machine, the third gas machine and the first motor together, the electric energy required by the first motor is provided by a ship power grid, or the power supply of the second motor is connected, the first propeller and the second propeller are driven by the first gas machine, the second gas machine, the third gas machine and the second motor together, and the electric energy required by the second motor is provided by the ship power grid;
or the first clutch, the second clutch, the seventh clutch and the eighth clutch are closed, other clutches are disconnected, the power supplies of the first motor and the second motor are connected, the first propeller and the second propeller are driven by the second gas machine, the third gas machine, the first motor and the second motor together, and the electric energy required by the first motor and the second motor is provided by a ship power grid;
or the first clutch, the second clutch, the seventh clutch and the eighth clutch are closed, the other clutches are opened, the power supply of the first motor is connected, the first propeller and the second propeller are powered by the first gas machine, the second gas machine, the third gas machine and the first motor to drive the first motor together, and the electric energy required by the first motor is provided by the ship power grid, or the power supply of the second motor is connected, and the first propeller and the second propeller are powered by the first gas machine, the second gas machine, the third gas machine and the second motor to drive the second motor together;
or the second clutch, the third clutch, the fourth clutch, the sixth clutch and the eighth clutch are connected, other clutches are disconnected, the power supplies of the first motor and the second motor are connected, the first propeller and the second propeller are driven by the first gas engine, the first motor and the second motor together, and the electric energy required by the first motor and the second motor is provided by a ship power grid;
or the second clutch, the third clutch, the fourth clutch, the sixth clutch and the eighth clutch are connected, other clutches are disconnected, the power supply of the first motor is connected, the first propeller and the second propeller are driven by the first gas machine and the first motor together, and the electric energy required by the first motor is provided by a ship power grid, or the power supply of the second motor is connected, the first propeller and the second propeller are driven by the first gas machine and the second motor together, and the electric energy required by the second motor is provided by the ship power grid;
the gas engine and the motor assist in generating power and propelling mode: all the clutches are closed, the power supplies of the first motor and the second motor are switched on, a part of power generated by the first gas machine drives the generator to generate power, the generated power can be converged into a ship power grid, the other part of power and the second gas machine, the third gas machine, the first motor and the second motor jointly drive the first propeller and the second propeller, and electric energy required by the first motor and the second motor is provided by the ship power grid; or the fourth clutch is disconnected, other clutches are closed, one part of power generated by the second gas machine and the third gas machine and the first motor and the second motor drive the first propeller and the second propeller together, the other part of power generated by the second gas machine and the third gas machine drives the generator to generate power, the generated power can be converged into a ship power grid, and electric energy required by the first motor and the second motor is provided by the ship power grid; or the second clutch, the third clutch, the fourth clutch, the fifth clutch, the sixth clutch and the eighth clutch are closed, other clutches are opened, part of power generated by the first gas machine drives the generator to generate power, the generated power can be converged into a ship power grid, the other part of power generated by the first gas machine and the first motor and the second motor drive the first propeller and the second propeller together, and electric energy required by the first motor and the second motor is provided by the ship power grid.
The invention has the advantages that:
1. the invention provides a power split-flow type gas-electricity hybrid ship power system which is provided with a gas engine, a generator and a motor, has wide power coverage range, can meet the power requirement of a ship under more working conditions, and can enable the gas engine and the motor to better work in a high-efficiency area, thereby reducing the fuel consumption of the gas engine and improving the economy and the emission of the ship.
2. The gas engine with different power is adopted, the range of the efficient working area is large, the power range is wide, the output is stable, the requirement for long-time cruising of the ship under different working conditions and different speeds is met, the poor emission performance of the ship during low-speed cruising can be avoided, and the condition that the power grid of the ship is short easily during electric propulsion can be relieved.
3. The hybrid power system provided by the invention can realize multiple working modes, improve the efficiency of the hybrid power system of the ship to the maximum extent and 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.
4. The motor has excellent power response, can be closed and opened at any time, can quickly adjust power output when the ship changes working conditions, improves the power response of the ship, and reduces system maintenance.
5. The gas engine and the generator can realize independent work through the closing and the opening of the clutch, and the function of the generator set can be realized. The noise reduction can be greatly realized during electric propulsion, the seaworthiness area of the ship is increased, and the living comfort of sailors is improved.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
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, the power split type gas-electric hybrid ship power system of the present invention includes gas machines 1a, 1b, and 1c, clutches 2a, 2b, 2c, 2d, 2e, 2f, 2g, and 2h, gear boxes 3a, 3b, and 3c, motors 4a and 4b, propellers 5a and 5b, a gasification heat exchanger 6, an LNG tank 7, a generator 8, a fuel cell 9, a fuel cell power transformation device 10, a generator power transformation device 11, a ship power grid 12, a shore power device 13, a ship load 14, a storage battery 15, and a storage battery power transformation device 16. The output ends of the gas machines 1a, 1b and 1c are respectively connected with the input ends of the gear boxes 3b, 3a and 3c through clutches 2a, 2d and 2g, the generator 8 is connected with the gear box 3a through a clutch 2e, the output ends of the motors 4a and 4b are connected with the propellers 5a and 5b, and the output end of the gear box 3a is respectively connected with the gear boxes 3b and 3c through clutches 2c and 2 f. The LNG tank 7 is connected to the gas engines 1a, 1b, 1c and the fuel cell 9 through the vaporizing heat exchanger 6. The storage battery 15 and the generator 8 are connected to the ship power grid 12 through the power transformation devices 16 and 11, respectively, and the shore power device 13 and the ship load 14 are connected to the ship power grid 12.
In this embodiment, the gas engines 1a and 1b are preferably pure natural gas engines or dual-fuel engines, the generator 8 and the motors 4a and 4b are preferably permanent magnet motors having advantages of high efficiency, high power density, long service life, and the like, the storage battery 8 is preferably a lithium ion battery having high power density and small volume and weight, the fuel battery is a solid oxide fuel battery, and the gasification heat exchanger 6 is preferably an ultralow temperature resistant heat exchanger having multi-stage cold energy heat exchange.
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 auxiliary power generation propulsion mode.
1) Gas engine propulsion mode: in this operating mode, the clutch 2e is open, the other clutches are all closed, and the propellers 5a, 5b are driven jointly by the gas machines 1a, 1b, 1 c; alternatively, the clutches 2a, 2b, 2g, 2h are closed, the other clutches are opened, the power sources of the motors 4a, 4b are disconnected, and the propellers 5a, 5b are driven by the gas machines 1b, 1c, respectively; alternatively, the clutches 2b, 2c, 2d, 2f, 2h are closed, the other clutches are opened, the electric motors 4a, 4b are powered off, and the propellers 5a, 5b are driven by the gas engine 1 a.
2) Auxiliary power generation propulsion mode of the gas engine: in the working mode, the clutches are all closed, the propellers 5a and 5b are driven by part of power generated by the gas engines 1a, 1b and 1c together, the other part of power is used for driving the generator 8 to generate electricity, and the generated electricity can be converged into the ship power grid 12; or, the clutches 2a, 2b, 2c, 2e, 2f, 2g and 2h are closed, the clutch 2d is opened, the power supplies of the motors 4a and 4b are disconnected, the propellers 5a and 5b are respectively driven by part of power generated by the gas machines 1b and 1c, the other part of power is used for driving the generator 8 to generate electricity, and the generated electricity can be converged into the ship power grid 12; or the clutches 2b, 2c, 2d, 2e, 2f and 2h are closed, other clutches are opened, the power supplies of the motors 4a and 4b are disconnected, the propellers 5a and 5b are driven by part of power generated by the gas engine 1a, the other part of power is used for driving the generator 8 to generate power, and the generated power can be converged into the ship power grid 12; alternatively, the clutches 2c, 2f are opened, the other clutches are closed, the propellers 5a, 5b are driven by the gas machines 1b, 1c, the generator 8 is driven by the gas machine 1a alone, and the generated power is converged into the ship power grid 12.
2. Electric propulsion mode
The electric propulsion modes can be divided into: battery propulsion mode, fuel cell propulsion mode, shore power charging mode.
1) Battery propulsion mode: in this operating mode, the clutches 2b, 2h are disengaged, the propellers 5a, 5b are driven by the electric motors 4a, 4b, and the electric energy required by the electric motors 4a, 4b is supplied by the accumulator 15 via the marine power grid 12.
3) Fuel cell propulsion mode: in this operating mode, the clutches 2b, 2h are disengaged, the propellers 5a, 5b are driven by the electric motors 4a, 4b, and the electric energy required by the electric motors 4a, 4b is supplied by the fuel cell 9 via the marine power grid 12.
2) Shore power charging mode: at the end of this kind of work, when the boats and ships berth in harbour and bank, accessible bank electricity charging device 13 external power supply is for battery 15 charges.
3. Hybrid propulsion mode
The hybrid propulsion modes can be divided into: a gas machine and motor propulsion mode and a gas machine and motor auxiliary power generation propulsion mode.
1) Gas machine + motor propulsion mode: in this operating mode, the clutch 2e is opened, the gas clutches are all closed, the electric motors 4a and 4b are powered on, the propellers 5a and 5b are driven by the gas machines 1a, 1b and 1c and the electric motors 4a and 4b together, and the electric energy required by the electric motors 4a and 4b is provided by the ship power grid 12; or the clutch 2e is disconnected, the gas clutch is closed completely, the electric motor 4a (or 4b) is powered on, the propellers 5a and 5b are driven by the gas engine 1a, 1b and 1c and the electric motor 4a (or 4b) together, and the electric energy required by the electric motor 4a (or 4b) is provided by the ship power grid 12; or the clutches 2a, 2b, 2g and 2h are closed, other clutches are opened, the electric motors 4a and 4b are powered on, the propellers 5a and 5b are driven by the gas machines 1b and 1c and the electric motors 4a and 4b together, and the electric energy required by the electric motors 4a and 4b is provided by the ship power grid 12; alternatively, the clutches 2a, 2b, 2g, 2h are closed, the other clutches are opened, the electric motor 4a (or 4b) is powered on, and the electric energy required by the propellers 5a, 5b to jointly drive the electric motor 4a (or 4b) by the gas engines 1a, 1b, 1c and the electric motor 4a (or 4b) is provided by the ship power grid 12; or the clutches 2b, 2c, 2d, 2f and 2h are switched on, other clutches are switched off, the electric motors 4a and 4b are powered on, the propellers 5a and 5b are driven by the gas engine 1a and the electric motors 4a and 4b together, and the electric energy required by the electric motors 4a and 4b is provided by the ship power grid 12; alternatively, the clutches 2b, 2c, 2d, 2f, 2h are on, the other clutches are off, the electric motor 4a (or 4b) is on, and the electric power required for the propellers 5a, 5b to drive the electric motor 4a (or 4b) jointly by the gas engine 1a and the electric motor 4a (4b) is supplied by the ship power grid 12.
2) The gas engine and the motor assist in generating power and propelling mode: in the working mode, all clutches are closed, the motors 4a and 4b are powered on, a part of power generated by the gas engine 1a drives the generator 8 to generate power, the generated power can be converged into a ship power grid 12, the other part of power is transmitted through gears and jointly drives the propellers 5a and 5b with the motors 4a and 4b of the gas engine 1b and 1c, and the electric energy required by the motors 4a and 4b is provided by the ship power grid 12; or the clutch 2d is disconnected, other clutches are closed, one part of power generated by the gas machines 1b and 1c and the motors 4a and 4b drive the propellers 5a and 5b together, the other part of power generated by the gas machines 1b and 1c drive the generators to generate power, the generated power can be converged into the ship power grid 12, and the electric energy required by the motors 4a and 4b is provided by the ship power grid 12; or, the clutches 2b, 2c, 2d, 2e, 2f and 2h are closed, other clutches are opened, a part of power generated by the gas engine 1a drives the generator 8 to generate power, the generated power is converged into the ship power grid 12, the other part of power generated by the gas engine 1a and the motors 4a and 4b drive the propellers 5a and 5b together, and the electric energy required by the motors 4a and 4b is provided by the ship power grid 12.
In the above mode: the mechanical propulsion mode is suitable for long-time cruising with stable ship operation conditions or areas with low requirements on ship emission and noise; the electric propulsion mode is suitable for the condition of low power requirement when the ship is on the shore or leaves, or sails in an area with higher requirements on ship emission and noise; the hybrid propulsion mode is suitable for when the ship has a certain demand for propulsion power.
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 the ship load 14 is provided by the storage battery 15 and the fuel cell 9, the power generated by the generator 8 is preferentially used when the generator runs, and the priority of the power utilization of the ship load 14 is as follows: the generator 8 generates more power than the fuel cell 9 and more power than the battery 15.
Claims (3)
1. A power split type gas-electricity hybrid ship power system is characterized in that: comprises a first gas machine, a second gas machine, a third gas machine, a first gear box, a second gear box, a third gear box, a first motor, a second motor, a generator and an LNG liquid storage tank, wherein the first gear box comprises a first gear, a second gear and a third gear, the second gear is respectively meshed with the first gear and the third gear, the second gear box comprises a fourth gear, a fifth gear and a sixth gear, the fifth gear is respectively meshed with the fourth gear and the sixth gear, the third gear box comprises a seventh gear, an eighth gear and a ninth gear, the eighth gear is respectively meshed with the seventh gear and the ninth gear, the second gas machine is connected with the fourth gear through a first clutch, the first motor is connected with the fourth gear through a second clutch, the first gear is connected with the sixth gear through the third clutch, the first gas machine is connected with the second gear through the fourth clutch, the generator is connected with a second gear through a fifth clutch, a third gear is connected with a seventh gear through a sixth clutch, a third gas machine is connected with a ninth gear through the seventh clutch, a second motor is connected with the ninth gear through an eighth clutch, a first propeller is connected with a first motor, a second propeller is connected with a second motor, an LNG liquid storage tank is respectively connected with the first gas machine, the second gas machine, the third gas machine and a fuel cell through a gasification heat exchanger, a storage battery and the generator are respectively connected with a ship power grid through respective power transformation devices, a shore power device and a ship load are connected with the ship power grid, and the powers of the first gas machine, the second gas machine and the third gas machine are different;
adopting a hybrid propulsion mode, wherein the hybrid propulsion mode comprises a gas engine and electric motor propulsion mode and a gas engine and electric motor auxiliary power generation propulsion mode;
gas machine + motor propulsion mode: the fifth clutch is disconnected, other clutches are all closed, the power supplies of the first motor and the second motor are connected, the first propeller and the second propeller are driven by the first gas machine, the second gas machine, the third gas machine, the first motor and the second motor together, and electric energy required by the first motor and the second motor is provided by a ship power grid;
or the fifth clutch is disconnected, the gas clutches are all closed, the power supply of the first motor is connected, the first propeller and the second propeller are driven by the first gas machine, the second gas machine, the third gas machine and the first motor together, the electric energy required by the first motor is provided by a ship power grid, or the power supply of the second motor is connected, the first propeller and the second propeller are driven by the first gas machine, the second gas machine, the third gas machine and the second motor together, and the electric energy required by the second motor is provided by the ship power grid;
or the first clutch, the second clutch, the seventh clutch and the eighth clutch are closed, other clutches are disconnected, the power supplies of the first motor and the second motor are connected, the first propeller and the second propeller are driven by the second gas machine, the third gas machine, the first motor and the second motor together, and the electric energy required by the first motor and the second motor is provided by a ship power grid;
or the first clutch, the second clutch, the seventh clutch and the eighth clutch are closed, the other clutches are opened, the power supply of the first motor is connected, the first propeller and the second propeller are powered by the first gas machine, the second gas machine, the third gas machine and the first motor to drive the first motor together, and the electric energy required by the first motor is provided by the ship power grid, or the power supply of the second motor is connected, and the first propeller and the second propeller are powered by the first gas machine, the second gas machine, the third gas machine and the second motor to drive the second motor together;
or the second clutch, the third clutch, the fourth clutch, the sixth clutch and the eighth clutch are connected, other clutches are disconnected, the power supplies of the first motor and the second motor are connected, the first propeller and the second propeller are driven by the first gas engine, the first motor and the second motor together, and the electric energy required by the first motor and the second motor is provided by a ship power grid;
or the second clutch, the third clutch, the fourth clutch, the sixth clutch and the eighth clutch are connected, other clutches are disconnected, the power supply of the first motor is connected, the first propeller and the second propeller are driven by the first gas machine and the first motor together, and the electric energy required by the first motor is provided by a ship power grid, or the power supply of the second motor is connected, the first propeller and the second propeller are driven by the first gas machine and the second motor together, and the electric energy required by the second motor is provided by the ship power grid;
the gas engine and the motor assist in generating power and propelling mode: all the clutches are closed, the power supplies of the first motor and the second motor are switched on, a part of power generated by the first gas machine drives the generator to generate power, the generated power can be converged into a ship power grid, the other part of power and the second gas machine, the third gas machine, the first motor and the second motor jointly drive the first propeller and the second propeller, and electric energy required by the first motor and the second motor is provided by the ship power grid; or the fourth clutch is disconnected, other clutches are closed, one part of power generated by the second gas machine and the third gas machine and the first motor and the second motor drive the first propeller and the second propeller together, the other part of power generated by the second gas machine and the third gas machine drives the generator to generate power, the generated power can be converged into a ship power grid, and electric energy required by the first motor and the second motor is provided by the ship power grid; or the second clutch, the third clutch, the fourth clutch, the fifth clutch, the sixth clutch and the eighth clutch are closed, other clutches are opened, part of power generated by the first gas machine drives the generator to generate power, the generated power can be converged into a ship power grid, the other part of power generated by the first gas machine and the first motor and the second motor drive the first propeller and the second propeller together, and electric energy required by the first motor and the second motor is provided by the ship power grid.
2. The power split gas-electric hybrid marine power system as claimed in claim 1, wherein: replacing the hybrid propulsion mode with a mechanical propulsion mode, the mechanical propulsion mode comprising a gas engine propulsion mode, a gas engine auxiliary power generation propulsion mode;
gas engine propulsion mode: the fifth clutch is disconnected, other clutches are all closed, and the first propeller and the second propeller are driven by the first gas machine, the second gas machine and the third gas machine together; or the first clutch, the second clutch, the seventh clutch and the eighth clutch are closed, other clutches are opened, the power supplies of the first motor and the second motor are disconnected, and the first propeller and the second propeller are respectively driven by the second gas machine and the third gas machine; or the second clutch, the third clutch, the fourth clutch, the sixth clutch and the eighth clutch are closed, other clutches are disconnected, the power supplies of the first motor and the second motor are disconnected, and the first propeller and the second propeller are driven by the first gas engine;
auxiliary power generation propulsion mode of the gas engine: the clutch is closed completely, the first propeller and the second propeller are driven by part of power generated by the first gas machine, the second gas machine and the third gas machine together, the other part of power is used for driving the generator to generate power, and the generated power can be converged into a ship power grid; or the fourth clutch is disconnected, other clutches are closed, the power supplies of the first motor and the second motor are disconnected, the first propeller and the second propeller are respectively driven by a part of power generated by the second gas engine and the third gas engine, the other part of power is used for driving the generator to generate power, and the generated power can be converged into a ship power grid; or the first clutch and the seventh clutch are disconnected, other clutches are closed, the power supplies of the first motor and the second motor are disconnected, the first propeller and the second propeller are driven by part of power generated by the first gas engine, the other part of power is used for driving the generator to generate power, and the generated power can be converged into a ship power grid; or the third clutch and the sixth clutch are disconnected, other clutches are closed, the first propeller and the second propeller are driven by the second gas machine and the third gas machine, the generator is driven by the first gas machine alone, and the generated electricity can be converged into a ship power grid.
3. The power split gas-electric hybrid marine power system as claimed in claim 1, wherein: replacing the hybrid propulsion mode with an electric propulsion mode, the electric propulsion mode including a battery propulsion mode, a fuel cell propulsion mode, a shore power charging mode;
battery propulsion mode: the second clutch and the eighth clutch are disconnected, the first propeller and the second propeller are driven by the first motor and the second motor, and electric energy required by the first motor and the second motor is provided by the storage battery through a ship power grid;
fuel cell propulsion mode: the second clutch and the eighth clutch are disconnected, the first propeller and the second propeller are driven by the first motor and the second motor, and electric energy required by the first motor and the second motor is provided by the fuel cell through a ship power grid;
shore power charging mode: when the ship stops at a port and a shore, the storage battery is charged by an external power supply of the shore power charging device.
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