Marine alcohol hydrogen power system and control method

Abstract

The marine alcohol-hydrogen power system comprises a methanol fuel tank, a hydrogen storage tank, a methanol extended-range system, a hydrogen fuel cell, a methanol reforming hydrogen production system, an energy storage system, a driving motor, a speed reduction clutch, a propeller and an inverter power supply / load cabinet, the methanol fuel tank is respectively communicated with the input end of the methanol reforming hydrogen production system and the input end of the methanol reforming hydrogen production system, the hydrogen storage tank is connected with the input end of the hydrogen fuel cell, the output end of the methanol reforming hydrogen production system is connected with the input end of the hydrogen fuel cell, and the output end of the methanol reforming hydrogen production system is connected with the input end of the energy storage system. The output end of the hydrogen fuel cell is connected with the input end of the energy storage system, and the output end of the energy storage system is connected with the inverter power supply / load cabinet and the driving motor. According to the invention, the problems of slow dynamic response, poor stability and the like of energy supply of a single fuel cell can be solved.

Description

Technical Field

[0001] The present invention relates to the technical field of marine alcohol-hydrogen hybrid power systems, and in particular to a marine alcohol-hydrogen power system and a control method thereof. Background Art

[0002] At present, domestic ship power systems are generally diesel or gas engine power systems. Users are more accepting of power systems with high mechanized structures, and the maintenance of this type of system is relatively mature and reliable, but it also has problems such as high fuel consumption, high noise, and single function.

[0003] Green and intelligent shipping is the trend, and the application of new energy technologies for ships is also developing. New energy marine power technologies are gradually being promoted and applied.

[0004] The operating conditions of ships are complex, and hydrogen fuel cells have shortcomings such as slow dynamic response and insufficient stability. If hydrogen fuel cells are used alone to power the ship's power system, they cannot meet the ship's power needs, and hydrogen fuel does not have advantages in storage and price. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides a marine alcohol-hydrogen hybrid power system and control method. By controlling one or more energy replenishment modes of the hybrid system's fuel cell power supply and methanol range-extending power supply, the shortcomings of single fuel cell power supply, such as slow dynamic response and poor stability, are solved.

[0006] In order to achieve the above-mentioned object of the invention, the technical solution adopted by the present invention is as follows:

[0007] A marine alcohol-hydrogen hybrid power system comprises a methanol fuel tank, a hydrogen storage tank, a methanol range-extending system, a hydrogen fuel cell, a methanol reforming hydrogen production system, an energy storage system, a drive motor, a reduction clutch, a propeller and an inverter power supply / load cabinet, wherein the methanol fuel tank is respectively connected to an input end of a methanol reforming hydrogen production system and an input end of a methanol reforming hydrogen production system, the hydrogen storage tank is connected to an input end of a hydrogen fuel cell, an output end of the methanol reforming hydrogen production system is connected to an input end of a hydrogen fuel cell, an output end of the methanol reforming hydrogen production system is connected to an input end of an energy storage system, an output end of the hydrogen fuel cell is connected to an input end of an energy storage system, an output end of the energy storage system is respectively connected to an inverter power supply / load cabinet and a drive motor, and the drive motor is connected to a propeller via a reduction clutch; and the system controller is respectively connected to the methanol fuel tank, the hydrogen storage tank, the methanol range-extending system, the hydrogen fuel cell, the energy storage system, the drive motor and the inverter power supply / load cabinet.

[0008] The engine of the methanol range-extending system is a methanol engine and only generates electricity without direct drive. It can control the engine to work at a high-efficiency speed, improve the fuel economy of the system, and change working conditions and emissions. At the same time, it optimizes the working efficiency of the fuel cell and avoids working conditions that are not conducive to the life of the fuel cell, such as large power changes and overloads. The tail gas of the methanol range-extending system is used to reform the methanol to produce hydrogen for alcohol-hydrogen conversion, so as to better adjust the energy efficiency of the overall system.

[0009] All components of the system communicate through low-voltage communication, and the system operation status is ultimately controlled by the system controller, which controls the hydrogen fuel cell and extended-range power system to achieve accurate and rapid supply of ship power requirements under different operating conditions.

[0010] The propeller of the system is driven by a drive motor and a reduction clutch. The wide speed and high torque characteristics of the electric drive can meet the rapid and accurate response of the ship's power travel. The drive motor can be used as a generator to recover energy in downstream or ship braking conditions, and the recovered energy is transferred to the energy storage system for storage.

[0011] The energy storage system absorbs and stores the electricity generated by the methanol range extender system and the fuel cell, and provides it to the motor drive system to drive the propeller. At the same time, the electricity can be inverted by the inverter and used in the load cabinet.

[0012] The methanol range-extending system uses a flywheel integrated generator, eliminating the flywheel and flywheel housing on the engine, and using the rotor of the generator as the flywheel of the engine. The generator housing is integrated with the flywheel housing of the engine. The system operates under constant working conditions to ensure system fuel economy.

[0013] When the methanol range extender system is working, the exhaust gas is connected to methanol reforming to produce hydrogen, and the waste heat of the exhaust gas and the waste heat of cooling are used to produce hydrogen from methanol. The hydrogen can be provided to the fuel cell, thereby reusing the exhaust gas energy.

[0014] In order to achieve coordinated control of multiple power sources, a specific control method of the system controller of the marine alcohol-hydrogen hybrid power system is as follows:

[0015] Step 1: Input the system controller parameters, input the parameters of the efficient working area of ​​the methanol range-extending system, fuel cell, and reforming hydrogen production system, input the SOC power of the energy storage system, and the power demand parameters of the load cabinet;

[0016] Step 2: Start the test, obtain the actual power, and calculate the actual required power under the current working condition according to the ship's navigation status. The specific ship's navigation status and power supply mode are as follows;

[0017] When the ship is in the moored condition: the power supply mode adopts the hydrogen fuel / pure electric mode, that is, the energy storage system supplies power to the equipment on board; when the SOC of the energy storage system is higher than the design threshold SOCmax1, the energy storage system starts the whole ship and maintains the power demand of the whole ship; when the energy storage system is lower than the design threshold S0Cmin1, the fuel cell system is started for charging. During this process, the system controller information recognizes that the power response is less than the set threshold N1, and the power demand is less than the threshold P1. At this time, the system controller always maintains the SOC value of the energy storage system set between S0Cmin1 and SOCmax1 according to the ship's operating conditions and performs power protection. At the same time, the system controller monitors the remaining hydrogen in the hydrogen storage tank, including hydrogen pressure and temperature;

[0018] When the ship is in port entry or exit, the power supply mode adopts the fuel cell energy replenishment mode, that is, the system controller information identifies that the power response is less than the set threshold N2, and the power demand is less than the threshold P2; the system controller monitors the remaining hydrogen in the hydrogen storage tank, including the hydrogen pressure and temperature; at this time, the system is only powered by the fuel cell system to replenish the energy storage system, and then to supply power to the propeller or inverter power supply. The fuel cell is always in the high-efficiency working area, so that the SOC of the energy storage system is always maintained between S0Cmin2 and SOCmax2 and power protection is performed;

[0019] When the ship is in the berthing operation condition: the power supply mode adopts the extended-range power generation system energy replenishment mode, and the energy storage system is required to supply power to the onboard equipment. The system controller information recognizes that the power response is less than N3, and the power demand is less than P3. The methanol extended-range system works to replenish the energy storage system, so that the energy storage system SOC is always maintained between S0Cmin3 and SOCmax3 and the power is protected. At this time, the methanol extended-range system quickly reaches the set economic working curve and supplies power to the onboard equipment through the energy storage system and the inverter power supply; at the same time, the system controller monitors the remaining methanol in the methanol fuel tank, including the methanol liquid level, the exhaust temperature and pressure of the methanol extended-range system;

[0020] When the ship is in a fast-navigation condition: the power supply mode adopts the extended-range power generation system-fuel power supply-reforming hydrogen production mode, the system controller information identifies that the power response is less than N4, the power demand is less than P4, and the engine exhaust temperature of the extended-range type reaches the set value T and the exhaust flow reaches the set value L, and the methanol extended-range type + fuel cell system work together to supplement the energy storage system. At this time, the methanol extended-range type quickly reaches the set economic working curve, and the fuel cell system also works stably in the calibrated high-efficiency area. At the same time, the system controller controls the methanol reforming hydrogen production system to work, and uses the exhaust waste heat of the extended-range engine to reform the methanol in the methanol fuel tank to produce hydrogen. Methanol is converted into hydrogen fuel for use by the fuel system, so that the SOC of the energy storage system is always maintained between S0Cmin4 and SOCmax4 and power protection is performed. At this time, the system controller monitors the status of the methanol extended-range system and the remaining fuel in the hydrogen storage tank, including the methanol liquid level, the exhaust temperature and pressure of the methanol extended-range system, and the remaining hydrogen in the hydrogen storage tank, including the hydrogen pressure and temperature, and the reforming hydrogen production reaction rate;

[0021] When the ship is in high-speed sailing condition: the power supply mode adopts the methanol range extender and the fuel cell system to work together to supplement the energy storage system. The system controller information recognizes that the power response is less than N5, and the power demand is greater than P5, so that the SOC of the energy storage system is always maintained between S0Cmin5 and SOCmax5 and power protection is performed. At this time, the methanol range extender quickly reaches the set economic working curve, and the fuel cell system also works stably in the calibrated high efficiency area; power is supplied to the propeller or inverter power supply. At the same time, the system controller monitors the status of the methanol range extender system and the remaining fuel in the hydrogen storage tank, including the methanol liquid level, the exhaust temperature and pressure of the methanol range extender system, and the remaining hydrogen in the hydrogen storage tank, including the hydrogen pressure and temperature.

[0022] Step 3: When the ship is downstream or braking, the system identifies that the actual required power is ≤0, the power value of the energy storage system is less than the maximum value SOCmax6, and the energy storage system recovers energy.

[0023] The beneficial effects of the present invention are:

[0024] The present invention proposes a marine alcohol-hydrogen hybrid power system, which is composed of multiple power sources including a fuel cell system, a methanol range-extended power system, and a methanol reforming hydrogen production system. The hybrid system is controlled by using one or more energy replenishment methods for the fuel cell power supply and the methanol range-extended power supply. The shortcomings of slow dynamic response and poor stability of single fuel cell power supply are solved, and the energy supply is coordinated with the methanol range-extended power system and the methanol reforming hydrogen production system to better adjust the energy utilization efficiency of the overall system. The project plan improves the fuel economy of the entire power system, realizes the power generation and stable control of the alcohol-hydrogen power system, and realizes the braking energy recovery of the ship. The overall system control algorithm is used to control each module to achieve accurate and rapid response to the ship's power demand under different loads. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the architecture of a marine alcohol-hydrogen hybrid power system described in an embodiment of the present invention;

[0026] Figure 2 A control logic diagram of a marine alcohol-hydrogen hybrid power system according to an embodiment of the present invention;

[0027] Figure 3 A control flow chart of a marine alcohol-hydrogen hybrid power system according to an embodiment of the present invention;

[0028] Figure 4 This is the architecture diagram of the hybrid power system of traditional marine internal combustion engine and fuel cell;

[0029] Figure 5 It is a schematic diagram of the correspondence between the operating conditions and required power of a marine alcohol-hydrogen hybrid power system described in an embodiment of the present invention. DETAILED DESCRIPTION

[0030] In order to explain the technical content, achieved objectives and effects of the present invention in detail, the following is an explanation in combination with the implementation modes and the accompanying drawings.

[0031] like Figure 1A marine alcohol-hydrogen hybrid power system comprises a methanol fuel tank, a hydrogen storage tank, a methanol range-extending system, a hydrogen fuel cell, a methanol reforming hydrogen production system, an energy storage system, a drive motor, a reduction clutch, a propeller and an inverter power supply / load cabinet. The methanol fuel tank is respectively connected to the input end of the methanol reforming hydrogen production system and the input end of the methanol reforming hydrogen production system, the hydrogen storage tank is connected to the input end of the hydrogen fuel cell, the output end of the methanol reforming hydrogen production system is connected to the input end of the hydrogen fuel cell, the output end of the methanol reforming hydrogen production system is connected to the input end of the energy storage system, the output end of the hydrogen fuel cell is connected to the input end of the energy storage system, the output end of the energy storage system is respectively connected to the inverter power supply / load cabinet and the drive motor, and the drive motor is connected to the propeller through a reduction clutch; the system controller is respectively connected to the methanol fuel tank, the hydrogen storage tank, the methanol range-extending system, the hydrogen fuel cell, the energy storage system, the drive motor and the inverter power supply / load cabinet.

[0032] The engine of the methanol range-extending system is a methanol engine and only generates electricity without direct drive. It can control the engine to work at a high-efficiency speed, improve the fuel economy of the system, and change working conditions and emissions. At the same time, it optimizes the working efficiency of the fuel cell and avoids working conditions that are not conducive to the life of the fuel cell, such as large power changes and overloads. The tail gas of the methanol range-extending system is used to reform the methanol to produce hydrogen for alcohol-hydrogen conversion, so as to better adjust the energy efficiency of the overall system.

[0033] All components of the system communicate through low-voltage communication, and the system operation status is ultimately controlled by the system controller. The self-learning control algorithm is used to control the hydrogen fuel cell and extended-range power system to achieve accurate and rapid supply of ship power requirements under different operating conditions.

[0034] The propeller of the system is driven by a drive motor and a reduction clutch. The wide speed and high torque characteristics of the electric drive can meet the rapid and accurate response of the ship's power travel. The drive motor can be used as a generator to recover energy in downstream or ship braking conditions, and the recovered energy is transferred to the energy storage system for storage.

[0035] The energy storage system absorbs and stores the electricity generated by the methanol range extender system and the fuel cell, and provides it to the motor drive system to drive the propeller. At the same time, the electricity can be inverted by the inverter and used in the load cabinet.

[0036] The methanol range-extending system uses a flywheel integrated generator, eliminating the flywheel and flywheel housing on the engine, and using the rotor of the generator as the flywheel of the engine. The generator housing is integrated with the flywheel housing of the engine. The system operates under constant working conditions to ensure system fuel economy.

[0037] When the methanol range extender system is working, the exhaust gas is connected to methanol reforming to produce hydrogen, and the waste heat of the exhaust gas and the waste heat of cooling are used to produce hydrogen from methanol. The hydrogen can be provided to the fuel cell, thereby reusing the exhaust gas energy.

[0038] like Figure 2-3 , Figure 5 As shown, in order to achieve coordinated control of multiple power sources, the specific control process of a marine alcohol-hydrogen hybrid power system is as follows:

[0039] Step 1: Input the system controller parameters, input the parameters of the efficient working area of ​​the methanol range-extending system, fuel cell, and reforming hydrogen production system, input the SOC power of the energy storage system, and the power demand parameters of the load cabinet;

[0040] Step 2: Start the test, obtain the actual power, and calculate the actual required power under the current working condition according to the ship's navigation status. The specific ship's navigation status and power supply mode are as follows;

[0041] When the ship is in the moored condition: the power supply mode adopts the hydrogen fuel / pure electric mode, that is, the energy storage system supplies power to the equipment on board; when the SOC of the energy storage system is higher than the design threshold SOCmax1, the energy storage system starts the whole ship and maintains the power demand of the whole ship; when the energy storage system is lower than the design threshold S0Cmin1, the fuel cell system is started for charging. During this process, the system controller information recognizes that the power response is less than the set threshold N1, and the power demand is less than the threshold P1. At this time, the system controller always maintains the SOC value of the energy storage system set between S0Cmin1 and SOCmax1 according to the ship's operating conditions and performs power protection. At the same time, the system controller monitors the remaining hydrogen in the hydrogen storage tank, including hydrogen pressure and temperature;

[0042] When the ship is in port entry or exit, the power supply mode adopts the fuel cell energy replenishment mode, that is, the system controller information identifies that the power response is less than the set threshold N2, and the power demand is less than the threshold P2; the system controller monitors the remaining hydrogen in the hydrogen storage tank, including the hydrogen pressure and temperature; at this time, the system is only powered by the fuel cell system to replenish the energy storage system, and then to supply power to the propeller or inverter power supply. The fuel cell is always in the high-efficiency working area, so that the SOC of the energy storage system is always maintained between S0Cmin2 and SOCmax2 and power protection is performed;

[0043] When the ship is in the berthing operation condition: the power supply mode adopts the extended-range power generation system energy replenishment mode, and the energy storage system is required to supply power to the onboard equipment. The system controller information recognizes that the power response is less than N3, and the power demand is less than P3. The methanol extended-range system works to replenish the energy storage system, so that the energy storage system SOC is always maintained between S0Cmin3 and SOCmax3 and the power is protected. At this time, the methanol extended-range system quickly reaches the set economic working curve and supplies power to the onboard equipment through the energy storage system and the inverter power supply; at the same time, the system controller monitors the remaining methanol in the methanol fuel tank, including the methanol liquid level, the exhaust temperature and pressure of the methanol extended-range system;

[0044] When the ship is in a fast-navigation condition: the power supply mode adopts the extended-range power generation system-fuel power supply-reforming hydrogen production mode, the system controller information identifies that the power response is less than N4, the power demand is less than P4, and the engine exhaust temperature of the extended-range type reaches the set value T and the exhaust flow reaches the set value L, and the methanol extended-range type + fuel cell system work together to supplement the energy storage system. At this time, the methanol extended-range type quickly reaches the set economic working curve, and the fuel cell system also works stably in the calibrated high-efficiency area. At the same time, the system controller controls the methanol reforming hydrogen production system to work, and uses the exhaust waste heat of the extended-range engine to reform the methanol in the methanol fuel tank to produce hydrogen. Methanol is converted into hydrogen fuel for use by the fuel system, so that the SOC of the energy storage system is always maintained between S0Cmin4 and SOCmax4 and power protection is performed. At this time, the system controller monitors the status of the methanol extended-range system and the remaining fuel in the hydrogen storage tank, including the methanol liquid level, the exhaust temperature and pressure of the methanol extended-range system, and the remaining hydrogen in the hydrogen storage tank, including the hydrogen pressure and temperature, and the reforming hydrogen production reaction rate;

[0045] When the ship is in high-speed sailing condition: the power supply mode adopts the methanol range extender and the fuel cell system to work together to supplement the energy storage system. The system controller information recognizes that the power response is less than N5, and the power demand is greater than P5, so that the SOC of the energy storage system is always maintained between S0Cmin5 and SOCmax5 and power protection is performed. At this time, the methanol range extender quickly reaches the set economic working curve, and the fuel cell system also works stably in the calibrated high efficiency area; power is supplied to the propeller or inverter power supply. At the same time, the system controller monitors the status of the methanol range extender system and the remaining fuel in the hydrogen storage tank, including the methanol liquid level, the exhaust temperature and pressure of the methanol range extender system, and the remaining hydrogen in the hydrogen storage tank, including the hydrogen pressure and temperature.

[0046] Step 3: When the ship is downstream or braking, the system identifies that the actual required power is ≤0, the power value of the energy storage system is less than the maximum value SOCmax6, and the energy storage system recovers energy.

[0047] The present invention provides a marine alcohol-hydrogen hybrid power system, which is composed of multiple power sources including a fuel cell system, a methanol range-extending power system, and a methanol reforming hydrogen production system. The hybrid system is controlled by using one or more energy replenishment methods such as the fuel cell energy supply and the methanol range-extending power supply. The shortcomings of a single fuel cell energy supply, such as slow dynamic response and poor stability, are solved, and the energy supply is coordinated with the methanol range-extending power system and the methanol reforming hydrogen production system to better adjust the energy efficiency of the overall system. Figure 4 The hybrid power system scheme of the traditional marine internal combustion engine and fuel cell shown in the figure improves the fuel economy of the entire power system, realizes the power generation and stable control of the alcohol-hydrogen power system, and realizes the braking energy recovery of the ship. The overall system control algorithm is used to control each module to achieve accurate and rapid response to the ship's power demand under different loads.

[0048] Although the present invention has been described in detail above with specific embodiments, it is obvious to those skilled in the art that some modifications or improvements can be made to the present invention. Therefore, these modifications or improvements made without departing from the spirit of the present invention all belong to the scope of protection claimed by the present invention.

Claims

1. A marine alcohol-hydrogen power system, characterized in that: It includes a methanol fuel tank, a hydrogen storage tank, a methanol range-extending system, a hydrogen fuel cell, a methanol reforming hydrogen production system, an energy storage system, a drive motor, a reduction clutch, a propeller and an inverter power supply / load cabinet. The methanol fuel tank is respectively connected to the input end of the methanol reforming hydrogen production system and the input end of the methanol reforming hydrogen production system, the hydrogen storage tank is connected to the input end of the hydrogen fuel cell, the output end of the methanol reforming hydrogen production system is connected to the input end of the hydrogen fuel cell, the output end of the methanol reforming hydrogen production system is connected to the input end of the energy storage system, the output end of the hydrogen fuel cell is connected to the input end of the energy storage system, the output end of the energy storage system is respectively connected to the inverter power supply / load cabinet and the drive motor, and the drive motor is connected to the propeller through a reduction clutch; the system controller is respectively connected to the methanol fuel tank, the hydrogen storage tank, the methanol range-extending system, the hydrogen fuel cell, the energy storage system, the drive motor and the inverter power supply / load cabinet.

2. A control method for a marine alcohol-hydrogen hybrid power system, characterized in that The following steps are involved: Step 1: Input the system controller parameters, input the parameters of the efficient working area of ​​the methanol range-extending system, fuel cell, and reforming hydrogen production system, input the SOC power of the energy storage system, and the power demand parameters of the load cabinet; Step 2: Start the test, obtain the actual power, and calculate the actual required power under the current working condition according to the ship's navigation status. The specific ship's navigation status and power supply mode are as follows; When the ship is in the moored condition: the power supply mode adopts the hydrogen fuel / pure electric mode, that is, the energy storage system supplies power to the equipment on board; when the SOC of the energy storage system is higher than the design threshold SOCmax1, the energy storage system starts the whole ship and maintains the power demand of the whole ship; when the energy storage system is lower than the design threshold S0Cmin1, the fuel cell system is started for charging. During this process, the system controller information recognizes that the power response is less than the set threshold N1, and the power demand is less than the threshold P1. At this time, the system controller always maintains the SOC value of the energy storage system set between S0Cmin1 and SOCmax1 according to the ship's operating conditions and performs power protection. At the same time, the system controller monitors the remaining hydrogen in the hydrogen storage tank, including hydrogen pressure and temperature; When the ship is in port entry or exit, the power supply mode adopts the fuel cell energy replenishment mode, that is, the system controller information identifies that the power response is less than the set threshold N2, and the power demand is less than the threshold P2; the system controller monitors the remaining hydrogen in the hydrogen storage tank, including the hydrogen pressure and temperature; at this time, the system is only powered by the fuel cell system to replenish the energy storage system, and then to supply power to the propeller or inverter power supply. The fuel cell is always in the high-efficiency working area, so that the SOC of the energy storage system is always maintained between S0Cmin2 and SOCmax2 and power protection is performed; When the ship is in the berthing operation condition: the power supply mode adopts the extended-range power generation system energy replenishment mode, and the energy storage system is required to supply power to the onboard equipment. The system controller information recognizes that the power response is less than N3, and the power demand is less than P3. The methanol extended-range system works to replenish the energy storage system, so that the energy storage system SOC is always maintained between S0Cmin3 and SOCmax3 and the power is protected. At this time, the methanol extended-range system quickly reaches the set economic working curve and supplies power to the onboard equipment through the energy storage system and the inverter power supply; at the same time, the system controller monitors the remaining methanol in the methanol fuel tank, including the methanol liquid level, the exhaust temperature and pressure of the methanol extended-range system; When the ship is in a fast-navigation condition: the power supply mode adopts the extended-range power generation system-fuel power supply-reforming hydrogen production mode, the system controller information identifies that the power response is less than N4, the power demand is less than P4, and the engine exhaust temperature of the extended-range type reaches the set value T and the exhaust flow reaches the set value L, and the methanol extended-range type + fuel cell system work together to supplement the energy storage system. At this time, the methanol extended-range type quickly reaches the set economic working curve, and the fuel cell system also works stably in the calibrated high-efficiency area. At the same time, the system controller controls the methanol reforming hydrogen production system to work, and uses the exhaust waste heat of the extended-range engine to reform the methanol in the methanol fuel tank to produce hydrogen. Methanol is converted into hydrogen fuel for use by the fuel system, so that the SOC of the energy storage system is always maintained between S0Cmin4 and SOCmax4 and power protection is performed. At this time, the system controller monitors the status of the methanol extended-range system and the remaining fuel in the hydrogen storage tank, including the methanol liquid level, the exhaust temperature and pressure of the methanol extended-range system, and the remaining hydrogen in the hydrogen storage tank, including the hydrogen pressure and temperature, and the reforming hydrogen production reaction rate; When the ship is in high-speed sailing condition: the power supply mode adopts the methanol range extender and the fuel cell system to work together to supplement the energy storage system. The system controller information recognizes that the power response is less than N5, and the power demand is greater than P5, so that the SOC of the energy storage system is always maintained between S0Cmin5 and SOCmax5 and power protection is performed. At this time, the methanol range extender quickly reaches the set economic working curve, and the fuel cell system also works stably in the calibrated high efficiency area; power is supplied to the propeller or inverter power supply. At the same time, the system controller monitors the status of the methanol range extender system and the remaining fuel in the hydrogen storage tank, including the methanol liquid level, the exhaust temperature and pressure of the methanol range extender system, and the remaining hydrogen in the hydrogen storage tank, including the hydrogen pressure and temperature. Step 3: When the ship is downstream or braking, the system identifies that the actual required power is ≤0, the power value of the energy storage system is less than the maximum value SOCmax6, and the energy storage system recovers energy.

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