A method and system for controlling electric power of a ship

Abstract

The present invention discloses a method and system for controlling power of a ship, the method comprising: the first direct current generated by a hydrogen fuel cell reaction terminal is inverted into a first alternating current, the first alternating current after voltage reduction is obtained after voltage reduction, and the first alternating current after voltage reduction is transmitted to a ship power terminal; the first direct current generated by the hydrogen fuel cell reaction terminal through the electrochemical reaction of hydrogen is input into a direct current input unit to charge an energy storage terminal; when the hydrogen fuel cell reaction terminal stops generating direct current, the energy storage terminal inputs a second direct current into an inverter component and is inverted into a second alternating current through the inverter component, the second alternating current after voltage reduction is obtained after voltage reduction, and the second alternating current after voltage reduction is transmitted to the ship power terminal. The system comprises a hydrogen fuel cell power supply module, a lithium battery energy storage charging module and a lithium battery discharge module. The method and system for controlling power of a ship solve the problem that the existing power source of a ship cannot ensure the stable operation of the power load of the ship.

Description

Technical Field

[0001] The present invention relates to the field of ships, and in particular to a power control method and system for ships. Background Art

[0002] The power source of existing ships is usually powered by diesel generators. If diesel generators are used as power sources, there will be huge noise and fossil fuels need to be burned. In addition, after the diesel generator generates electricity, it directly supplies power to the ship's electrical load. When the diesel generator stops, the ship's electrical load will lose power and stop, so it is impossible to ensure the stable operation of the ship's electrical load. Summary of the invention

[0003] In order to overcome the defects of the prior art, an object of the present invention is to provide a power control method for a ship to solve the above-mentioned problems.

[0004] In order to overcome the defects of the prior art, another object of the present invention is to provide a power control system for a ship to solve the above-mentioned problems.

[0005] The technical solution adopted by the present invention to solve the technical problem is: a power control method for a ship, comprising:

[0006] Hydrogen fuel cell power supply step: the first direct current generated by the electrochemical reaction of hydrogen at the hydrogen fuel cell reaction terminal is input into the inverter component of the power bus terminal and then inverted into the first alternating current, the inverter component inputs the first alternating current into the primary side of the isolation transformer, and after the isolation transformer steps down the voltage, the first alternating current is obtained on its own secondary side after the voltage is stepped down, and then the stepped down first alternating current is transmitted to the ship power terminal through the power busbar of the power bus terminal;

[0007] Lithium battery energy storage charging step: the first direct current generated by the electrochemical reaction of hydrogen at the hydrogen fuel cell reaction terminal is input into the direct current input unit of the power bus terminal, and the direct current input unit inputs the first direct current into the energy storage terminal through the built-in direct current busbar of the power bus terminal and charges the energy storage terminal;

[0008] Lithium battery discharge steps: When the hydrogen fuel cell reaction terminal stops generating direct current, the energy storage terminal inputs a second direct current to the inverter component of the power bus terminal and inverts it into a second alternating current through the inverter component. The inverter component inputs the second alternating current to the primary side of the isolation transformer, and after being stepped down by the isolation transformer, the stepped-down second alternating current is obtained on its own secondary side, and then the stepped-down second alternating current is transmitted to the ship power terminal through the power busbar of the power bus terminal.

[0009] It is worth noting that the lithium battery energy storage charging step is specifically as follows: when the power of the first direct current generated by the hydrogen fuel cell reaction terminal through the electrochemical reaction of hydrogen is greater than the power consumption of the ship power terminal, the difference between the power of the first direct current generated by the hydrogen fuel cell reaction terminal through the electrochemical reaction of hydrogen and the power consumption of the ship power terminal is calculated to obtain the remaining power value, and the direct current corresponding to the remaining power value is distributed to the direct current input unit of the power bus terminal, and input into the energy storage terminal through the built-in direct current busbar of the power bus terminal to charge the energy storage terminal; wherein, the remaining power is the first direct current generated by the hydrogen fuel cell reaction terminal through the electrochemical reaction of hydrogen, and the power demand of the ship power terminal is met.

[0010] Specifically, the lithium battery energy storage charging step also includes: the shore-based AC power grid power supply terminal inputs the AC power after boosting and rectifying it into the DC input unit of the power bus terminal through its own charging and discharging unit, and the DC input unit inputs the boosted and rectified AC power into the energy storage terminal through the built-in DC busbar of the power bus terminal to charge the energy storage terminal.

[0011] Preferably, the power control method for the ship also includes a shore-based power supply step, and the shore-based power supply step is: the shore-based AC power grid power supply terminal inputs the city power into the power bus of the power bus terminal, and supplies power to the ship power terminal through the power bus.

[0012] Optionally, the ship power terminal includes a first propulsion power unit, a second propulsion power unit and a daily power load, the energy storage terminal includes a first lithium battery pack, a second lithium battery pack and a third lithium battery pack, and the inverter assembly includes a first inverter unit, a second inverter unit and a third inverter unit;

[0013] The lithium battery discharge step is specifically as follows: when the hydrogen fuel cell reaction terminal stops generating direct current, the second direct current generated by the first lithium battery pack is input into the first inverter unit for inversion into a corresponding second alternating current, and the isolation transformer steps down the voltage of the second alternating current and supplies power to the first propulsion power unit through the power busbar of the power bus terminal;

[0014] When the hydrogen fuel cell reaction terminal stops generating direct current, the second direct current generated by the second lithium battery pack is input into the second inverter unit for inversion into the corresponding second alternating current, and the isolation transformer steps down the voltage of the second alternating current and supplies power to the second propulsion power unit through the power busbar of the power bus terminal;

[0015] When the hydrogen fuel cell reaction terminal stops generating direct current, the second direct current generated by the third lithium battery pack is input into the third inverter unit for inversion into the corresponding second alternating current, and the isolation transformer steps down the voltage of the second alternating current and supplies power to the daily power load through the power bus of the power bus terminal.

[0016] It is worth noting that a power control system for a ship includes a hydrogen fuel cell power supply module, a lithium battery energy storage charging module and a lithium battery discharge module;

[0017] The hydrogen fuel cell power supply module is used to input the first direct current generated by the electrochemical reaction of hydrogen at the hydrogen fuel cell reaction terminal into the inverter component of the power bus terminal and invert it into the first alternating current, and is used to input the first alternating current into the primary side of the isolation transformer through the inverter component, and obtain the stepped-down first alternating current on its own secondary side after being stepped down by the isolation transformer, and is used to transmit the stepped-down first alternating current to the ship power terminal through the power busbar of the power bus terminal;

[0018] The lithium battery energy storage charging module is used to input the first direct current generated by the hydrogen electrochemical reaction of the hydrogen fuel cell reaction terminal into the direct current input unit of the power bus terminal, and is used to use the direct current input unit to input the first direct current into the energy storage terminal through the built-in direct current busbar of the power bus terminal and charge the energy storage terminal;

[0019] The lithium battery discharge module is used to input the second direct current to the inverter component of the power bus terminal through the energy storage terminal and invert it into the second alternating current through the inverter component when the hydrogen fuel cell reaction terminal stops generating direct current. It is also used to input the second alternating current to the primary side of the isolation transformer through the inverter component, and obtain the stepped-down second alternating current on its own secondary side after being stepped down by the isolation transformer. It is also used to transmit the stepped-down second alternating current to the ship power terminal through the power busbar of the power bus terminal.

[0020] Specifically, the lithium battery energy storage charging module is used to calculate the difference between the power of the first direct current generated by the hydrogen fuel cell reaction terminal through the electrochemical reaction of hydrogen and the power consumption of the ship power terminal when the power of the first direct current generated by the hydrogen fuel cell reaction terminal through the electrochemical reaction of hydrogen is greater than the power consumption of the ship power terminal, and obtain the remaining power value. It is also used to distribute the direct current corresponding to the remaining power value to the direct current input unit of the power bus terminal, and input it to the energy storage terminal through the built-in direct current busbar of the power bus terminal to charge the energy storage terminal; wherein the remaining power is the first direct current generated by the hydrogen fuel cell reaction terminal through the electrochemical reaction of hydrogen, and the power demand of the ship power terminal is met.

[0021] Preferably, the lithium battery energy storage charging module is also used to utilize the shore-based AC power grid power supply terminal to input the AC power after boosting and rectifying it into the DC input unit of the power bus terminal through its own charging and discharging unit, and is also used to utilize the DC input unit to input the boosted and rectified AC power into the energy storage terminal through the built-in DC busbar of the power bus terminal to charge the energy storage terminal.

[0022] Optionally, it also includes a shore-based power supply module, which is used to input the city power into the power busbar of the power bus terminal through the shore-based AC power grid power supply terminal, and supply power to the ship power terminal through the power busbar.

[0023] It is worth noting that the ship power terminal includes a first propulsion power unit, a second propulsion power unit and a daily power load, the energy storage terminal includes a first lithium battery pack, a second lithium battery pack and a third lithium battery pack, and the inverter assembly includes a first inverter unit, a second inverter unit and a third inverter unit;

[0024] The lithium battery discharge module is used for, when the hydrogen fuel cell reaction terminal stops generating direct current, inputting the second direct current generated by the first lithium battery pack into the first inverter unit for inversion into the corresponding second alternating current, and for supplying power to the first propulsion power unit through the power busbar of the power bus terminal after reducing the voltage of the second alternating current through the isolation transformer;

[0025] When the hydrogen fuel cell reaction terminal stops generating direct current, the second direct current generated by the second lithium battery pack is input into the second inverter unit for inversion into a corresponding second alternating current, and the second alternating current is stepped down by the isolation transformer and then supplied to the second propulsion power unit through the power busbar of the power bus terminal;

[0026] When the hydrogen fuel cell reaction terminal stops generating direct current, the second direct current generated by the third lithium battery pack is input into the third inverter unit for inversion into the corresponding second alternating current, and the second alternating current is stepped down by the isolation transformer and then supplied to the daily power load through the power bus of the power bus terminal.

[0027] The beneficial effect of the present invention is that in the power control method of the ship, the hydrogen fuel cell reaction terminal generates electricity by using the electrochemical reaction of hydrogen. In the process of supplying power to the ship power terminal, the hydrogen fuel cell reaction terminal also charges the energy storage terminal. When the hydrogen fuel cell reaction terminal is shut down, the charged energy storage terminal can continue to supply power to the ship power terminal, thereby ensuring that the ship's power load can operate stably. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 The present invention is a flowchart of a method for controlling power of a ship according to an embodiment of the present invention. DETAILED DESCRIPTION

[0029] The specific embodiments of the present invention are further described below in conjunction with the accompanying drawings. It should be noted that the description of these embodiments is used to help understand the present invention, but does not constitute a limitation of the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0030] like Figure 1 As shown, a power control method for a ship comprises:

[0031] Hydrogen fuel cell power supply step: the first direct current generated by the electrochemical reaction of hydrogen in the hydrogen fuel cell reaction terminal is input into the inverter component of the power bus terminal and then inverted into the first alternating current. The inverter component inputs the first alternating current into the primary side of the isolation transformer, and after the isolation transformer is stepped down, the stepped-down first alternating current is obtained on its own secondary side, and then the stepped-down first alternating current is transmitted to the ship power terminal through the power bus of the power bus terminal; in this embodiment, the hydrogen fuel cell reaction terminal includes a hydrogen fuel reaction unit, a hydrogen bottle group and a conveying fan, the hydrogen bottle group is connected to the hydrogen input end of the hydrogen fuel reaction unit through the conveying fan, the hydrogen fuel cell stack is built in the hydrogen fuel cell stack, the hydrogen of the hydrogen bottle group is transported into the hydrogen fuel cell stack through the conveying fan, and reacts chemically with oxygen in the air under the action of the catalyst to generate the first direct current; the voltage output by the hydrogen fuel cell reaction terminal is DC450-700V, so it needs to be converted by the inverter and stepped down by the isolation transformer to obtain AC380V or AC220V voltage power supply for use;

[0032] Lithium battery energy storage charging step: the first direct current generated by the electrochemical reaction of hydrogen at the hydrogen fuel cell reaction terminal is input into the direct current input unit of the power bus terminal, and the direct current input unit inputs the first direct current into the energy storage terminal through the built-in direct current busbar of the power bus terminal and charges the energy storage terminal;

[0033] Lithium battery discharge step: When the hydrogen fuel cell reaction terminal stops generating direct current, the energy storage terminal inputs the second direct current to the inverter component of the power bus terminal and inverts it into the second alternating current through the inverter component. The inverter component inputs the second alternating current into the primary side of the isolation transformer, and after the isolation transformer steps down the voltage, it obtains the stepped-down second alternating current on its own secondary side, and then transmits the stepped-down second alternating current to the ship power terminal through the power busbar of the power bus terminal. The voltage output by the energy storage terminal is DC512V, so it needs to be inverted by the inverter and stepped down by the isolation transformer to obtain AC380V or AC220V voltage for use by the power supply device.

[0034] Specifically, the power bus terminal is an existing electrical device, which has a built-in chopper, inverter, sine wave filter, power management system (PMS), AC switch, DC busbar and DC switch. Its function is to distribute the three power sources of the hydrogen fuel cell reaction terminal, the shore-based AC power grid power supply terminal and the energy storage terminal to the electrical equipment of the whole ship, or to the propulsion motor. Due to the different voltages, powers and AC / DC of the three power sources, the power bus terminal steps up / down, rectifies or filters the power provided by the hydrogen fuel cell reaction terminal, the shore-based AC power grid power supply terminal or the energy storage terminal according to the needs of the electrical equipment.

[0035] In the power control method of the ship, the hydrogen fuel cell reaction terminal generates electricity by using the electrochemical reaction of hydrogen. In the process of supplying power to the ship power terminal, the hydrogen fuel cell reaction terminal also charges the energy storage terminal. When the hydrogen fuel cell reaction terminal is shut down, the charged energy storage terminal can continue to supply power to the ship power terminal, thereby ensuring that the ship's power load can operate stably.

[0036] In some embodiments, the lithium battery energy storage charging step is specifically as follows: when the power of the first direct current generated by the hydrogen fuel cell reaction terminal through the electrochemical reaction of hydrogen is greater than the power consumption of the ship power terminal, the difference between the power of the first direct current generated by the hydrogen fuel cell reaction terminal through the electrochemical reaction of hydrogen and the power consumption of the ship power terminal is calculated to obtain a remaining power value, and the direct current corresponding to the remaining power value is distributed to the direct current input unit of the power bus terminal, and input into the energy storage terminal through the built-in direct current bus of the power bus terminal to charge the energy storage terminal; wherein the remaining power is the first direct current generated by the hydrogen fuel cell reaction terminal through the electrochemical reaction of hydrogen, and the power demand of the ship power terminal is met.

[0037] The hydrogen fuel cell reaction terminal is equivalent to a generator set. The voltage and frequency of the electricity generated by the hydrogen fuel cell reaction terminal are unstable. After filtering, voltage increase / decrease and voltage stabilization at the power bus terminal, it can be directly used by the ship power terminal. The excess electricity can also be charged to the energy storage terminal through the power bus terminal. When the hydrogen fuel cell reaction terminal is turned off, the electricity from the energy storage terminal is supplied to the ship power terminal after rectification and voltage reduction of the power bus. In this way, the energy of the hydrogen fuel cell reaction terminal through the electrochemical reaction of hydrogen can be used to the maximum extent, thereby improving the utilization rate of energy.

[0038] It is worth noting that the lithium battery energy storage charging step also includes: the shore-based AC power grid power supply terminal inputs the AC power after boosting and rectifying it into the DC input unit of the power bus terminal through its own charging and discharging unit, and the DC input unit inputs the boosted and rectified AC power into the energy storage terminal through the built-in DC busbar of the power bus terminal to charge the energy storage terminal.

[0039] The shore-based AC power supply terminal can add one more power input point for the ship. When the ship docks, the energy storage terminal can be charged through the shore-based AC power supply terminal. At this time, it is not necessary to start the hydrogen fuel cell reaction terminal to charge the energy storage terminal. Specifically, the charging and discharging unit is used to convert the input AC220V or AC380V mains power into DC512V direct current through boosting and rectification to charge the energy storage terminal.

[0040] Specifically, the power control method of the ship also includes a shore-based power supply step, which is: the shore-based AC power grid power supply terminal inputs the city power into the power busbar of the power bus terminal, and supplies power to the ship power terminal through the power busbar. After the ship docks, the shore-based AC power grid power supply terminal can use the city power to power the ship power terminal, so that there is no need to start the hydrogen fuel cell reaction terminal, saving hydrogen energy.

[0041] Preferably, the ship power terminal includes a first propulsion power unit, a second propulsion power unit and a daily power load, the energy storage terminal includes a first lithium battery pack, a second lithium battery pack and a third lithium battery pack, and the inverter assembly includes a first inverter unit, a second inverter unit and a third inverter unit;

[0042] The lithium battery discharge step is specifically as follows: when the hydrogen fuel cell reaction terminal stops generating direct current, the second direct current generated by the first lithium battery pack is input into the first inverter unit for inversion into a corresponding second alternating current, and the isolation transformer steps down the voltage of the second alternating current and supplies power to the first propulsion power unit through the power busbar of the power bus terminal;

[0043] When the hydrogen fuel cell reaction terminal stops generating direct current, the second direct current generated by the second lithium battery pack is input into the second inverter unit for inversion into the corresponding second alternating current, and the isolation transformer steps down the voltage of the second alternating current and supplies power to the second propulsion power unit through the power busbar of the power bus terminal;

[0044] When the hydrogen fuel cell reaction terminal stops generating direct current, the second direct current generated by the third lithium battery pack is input into the third inverter unit for inversion into the corresponding second alternating current, and the isolation transformer steps down the voltage of the second alternating current and supplies power to the daily power load through the power bus of the power bus terminal.

[0045] The energy storage terminal also includes a first bidirectional DCDC converter, a second bidirectional DCDC converter and a third bidirectional DCDC converter; the first lithium battery pack is electrically connected to the battery connection end of the first bidirectional DCDC converter, the charging end of the first bidirectional DCDC converter is electrically connected to the DC busbar, and the discharge end of the first bidirectional DCDC converter is electrically connected to the input end of the first inverter unit; the second lithium battery pack is electrically connected to the battery connection end of the second bidirectional DCDC converter, the charging end of the second bidirectional DCDC converter is electrically connected to the DC busbar, and the discharge end of the second bidirectional DCDC converter is electrically connected to the input end of the second inverter unit; the third lithium battery pack is electrically connected to the battery connection end of the third DCDC converter, the charging end of the third bidirectional DCDC converter is electrically connected to the DC busbar, and the discharge end of the third bidirectional DCDC converter is electrically connected to the input end of the third inverter unit.

[0046] The bidirectional DCDC converter is an existing structure. In one embodiment, the lithium battery pack is assisted by the bidirectional DCDC converter as an auxiliary energy source. When the ship power demand is large, the stored electric energy is released to the ship power terminal module 7 through the bidirectional DCDC converter to provide power for the ship; when the ship decelerates or brakes urgently, the electric energy generated by the hydrogen fuel cell reaction terminal during load reduction is stored, or when the shore-based AC power grid power supply terminal is connected, the lithium battery stores electric energy; when the lithium battery pack needs to be charged, the battery connection end of the bidirectional DCDC converter is connected to its own charging end, and the electric energy of the DC busbar is transmitted to the lithium battery pack to charge the lithium battery pack; when the lithium battery pack is discharged, the battery connection end of the bidirectional DCDC converter is connected to its own discharge end, and the lithium battery pack transmits electric energy to the input end of the corresponding inverter unit.

[0047] The first lithium battery pack is used to supply power to the first propulsion power unit, the second lithium battery pack is used to supply power to the second propulsion power unit, and the third lithium battery pack is used to supply power to daily power loads. The power supply sources for the first propulsion power unit, the second propulsion power unit and the daily power loads are separated to avoid simultaneous power outages of the first propulsion power unit, the second propulsion power unit and the daily power load 72 in the event of a fault.

[0048] It is worth noting that a power control system for a ship includes a hydrogen fuel cell power supply module, a lithium battery energy storage charging module and a lithium battery discharge module;

[0049] The hydrogen fuel cell power supply module is used to input the first direct current generated by the electrochemical reaction of hydrogen at the hydrogen fuel cell reaction terminal into the inverter component of the power bus terminal and invert it into the first alternating current, and is used to input the first alternating current into the primary side of the isolation transformer through the inverter component, and obtain the stepped-down first alternating current on its own secondary side after being stepped down by the isolation transformer, and is used to transmit the stepped-down first alternating current to the ship power terminal through the power busbar of the power bus terminal;

[0050] The lithium battery energy storage charging module is used to input the first direct current generated by the hydrogen electrochemical reaction of the hydrogen fuel cell reaction terminal into the direct current input unit of the power bus terminal, and is used to use the direct current input unit to input the first direct current into the energy storage terminal through the built-in direct current busbar of the power bus terminal and charge the energy storage terminal;

[0051] The lithium battery discharge module is used to input the second direct current to the inverter component of the power bus terminal through the energy storage terminal and invert it into the second alternating current through the inverter component when the hydrogen fuel cell reaction terminal stops generating direct current. It is also used to input the second alternating current to the primary side of the isolation transformer through the inverter component, and obtain the stepped-down second alternating current on its own secondary side after being stepped down by the isolation transformer. It is also used to transmit the stepped-down second alternating current to the ship power terminal through the power busbar of the power bus terminal.

[0052] Specifically, the lithium battery energy storage charging module is used to calculate the difference between the power of the first direct current generated by the hydrogen fuel cell reaction terminal through the electrochemical reaction of hydrogen and the power consumption of the ship power terminal when the power of the first direct current generated by the hydrogen fuel cell reaction terminal through the electrochemical reaction of hydrogen is greater than the power consumption of the ship power terminal, and obtain the remaining power value. It is also used to distribute the direct current corresponding to the remaining power value to the direct current input unit of the power bus terminal, and input it to the energy storage terminal through the built-in direct current busbar of the power bus terminal to charge the energy storage terminal; wherein the remaining power is the first direct current generated by the hydrogen fuel cell reaction terminal through the electrochemical reaction of hydrogen, and the power demand of the ship power terminal is met.

[0053] In some embodiments, the lithium battery energy storage charging module is also used to utilize the shore-based AC power grid power supply terminal to input the AC power after boosting and rectifying it into the DC input unit of the power bus terminal through its own charging and discharging unit, and is also used to utilize the DC input unit to input the boosted and rectified AC power into the energy storage terminal through the built-in DC busbar of the power bus terminal to charge the energy storage terminal.

[0054] Preferably, it also includes a shore-based power supply module, which is used to input the city power into the power busbar of the power bus terminal through the shore-based AC power grid power supply terminal, and supply power to the ship power terminal through the power busbar.

[0055] Specifically, the ship power terminal includes a first propulsion power unit, a second propulsion power unit and a daily power load, the energy storage terminal includes a first lithium battery pack, a second lithium battery pack and a third lithium battery pack, and the inverter assembly includes a first inverter unit, a second inverter unit and a third inverter unit;

[0056] The lithium battery discharge module is used for, when the hydrogen fuel cell reaction terminal stops generating direct current, inputting the second direct current generated by the first lithium battery pack into the first inverter unit for inversion into the corresponding second alternating current, and for supplying power to the first propulsion power unit through the power busbar of the power bus terminal after reducing the voltage of the second alternating current through the isolation transformer;

[0057] When the hydrogen fuel cell reaction terminal stops generating direct current, the second direct current generated by the second lithium battery pack is input into the second inverter unit for inversion into a corresponding second alternating current, and the second alternating current is stepped down by the isolation transformer and then supplied to the second propulsion power unit through the power busbar of the power bus terminal;

[0058] When the hydrogen fuel cell reaction terminal stops generating direct current, the second direct current generated by the third lithium battery pack is input into the third inverter unit for inversion into the corresponding second alternating current, and the second alternating current is stepped down by the isolation transformer and then supplied to the daily power load through the power bus of the power bus terminal.

[0059] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. For those skilled in the art, various changes, modifications, substitutions and variations of these embodiments are made without departing from the principles and spirit of the present invention, and still fall within the scope of protection of the present invention.

Claims

1. A method for controlling power of a ship, characterized in that: include: Hydrogen fuel cell power supply step: the first direct current generated by the electrochemical reaction of hydrogen at the hydrogen fuel cell reaction terminal is input into the inverter component of the power bus terminal and then inverted into the first alternating current, the inverter component inputs the first alternating current into the primary side of the isolation transformer, and after the isolation transformer steps down the voltage, the first alternating current is obtained on its own secondary side after the voltage is stepped down, and then the stepped down first alternating current is transmitted to the ship power terminal through the power busbar of the power bus terminal; Lithium battery energy storage charging step: the first direct current generated by the electrochemical reaction of hydrogen at the hydrogen fuel cell reaction terminal is input into the direct current input unit of the power bus terminal, and the direct current input unit inputs the first direct current into the energy storage terminal through the built-in direct current busbar of the power bus terminal and charges the energy storage terminal; Lithium battery discharge step: when the hydrogen fuel cell reaction terminal stops generating direct current, the energy storage terminal inputs a second direct current to the inverter assembly of the power bus terminal and inverts it into a second alternating current through the inverter assembly, the inverter assembly inputs the second alternating current into the primary side of the isolation transformer, and after being stepped down by the isolation transformer, obtains the stepped-down second alternating current on its own secondary side, and then transmits the stepped-down second alternating current to the ship power terminal through the power busbar of the power bus terminal; The ship power terminal includes a first propulsion power unit, a second propulsion power unit and a daily power load, the energy storage terminal includes a first lithium battery pack, a second lithium battery pack and a third lithium battery pack, and the inverter assembly includes a first inverter unit, a second inverter unit and a third inverter unit; The lithium battery discharge step is specifically as follows: when the hydrogen fuel cell reaction terminal stops generating direct current, the second direct current generated by the first lithium battery pack is input into the first inverter unit for inversion into a corresponding second alternating current, and the isolation transformer steps down the voltage of the second alternating current and supplies power to the first propulsion power unit through the power busbar of the power bus terminal; When the hydrogen fuel cell reaction terminal stops generating direct current, the second direct current generated by the second lithium battery pack is input into the second inverter unit for inversion into the corresponding second alternating current, and the isolation transformer steps down the voltage of the second alternating current and supplies power to the second propulsion power unit through the power busbar of the power bus terminal; When the hydrogen fuel cell reaction terminal stops generating direct current, the second direct current generated by the third lithium battery pack is input into the third inverter unit for inversion into the corresponding second alternating current, and the isolation transformer steps down the voltage of the second alternating current and supplies power to the daily power load through the power bus of the power bus terminal.

2. A ship power control method according to claim 1, characterized in that: The lithium battery energy storage charging step is specifically as follows: when the power of the first direct current generated by the hydrogen fuel cell reaction terminal through the electrochemical reaction of hydrogen is greater than the power consumption of the ship power terminal, the difference between the power of the first direct current generated by the hydrogen fuel cell reaction terminal through the electrochemical reaction of hydrogen and the power consumption of the ship power terminal is calculated to obtain a residual power value, and the direct current corresponding to the residual power value is distributed to the direct current input unit of the power bus terminal, and is input to the energy storage terminal through the built-in direct current busbar of the power bus terminal to charge the energy storage terminal; wherein the residual power is the first direct current generated by the hydrogen fuel cell reaction terminal through the electrochemical reaction of hydrogen, and the remaining power after meeting the power demand of the ship power terminal.

3. A ship power control method according to claim 2, characterized in that: The lithium battery energy storage charging step also includes: the shore-based AC power grid power supply terminal inputs the AC power after boosting and rectifying it into the DC input unit of the power bus terminal through its own charging and discharging unit, and the DC input unit inputs the boosted and rectified AC power into the energy storage terminal through the built-in DC busbar of the power bus terminal to charge the energy storage terminal.

4. A ship power control method according to claim 3, characterized in that: The power control method for the ship also includes a shore-based power supply step, which is as follows: the shore-based AC power grid power supply terminal inputs the city power into the power busbar of the power bus terminal, and supplies power to the ship power terminal through the power busbar.

5. A power control system for a ship, characterized in that: It includes a hydrogen fuel cell power supply module, a lithium battery energy storage charging module and a lithium battery discharge module; The hydrogen fuel cell power supply module is used to input the first direct current generated by the electrochemical reaction of hydrogen at the hydrogen fuel cell reaction terminal into the inverter component of the power bus terminal and invert it into the first alternating current, and is used to input the first alternating current into the primary side of the isolation transformer through the inverter component, and obtain the stepped-down first alternating current on its own secondary side after being stepped down by the isolation transformer, and is used to transmit the stepped-down first alternating current to the ship power terminal through the power busbar of the power bus terminal; The lithium battery energy storage charging module is used to input the first direct current generated by the hydrogen electrochemical reaction of the hydrogen fuel cell reaction terminal into the direct current input unit of the power bus terminal, and is used to use the direct current input unit to input the first direct current into the energy storage terminal through the built-in direct current busbar of the power bus terminal and charge the energy storage terminal; The lithium battery discharge module is used to input the second direct current to the inverter component of the power bus terminal through the energy storage terminal and invert it into the second alternating current through the inverter component when the hydrogen fuel cell reaction terminal stops generating direct current, and is also used to input the second alternating current to the primary side of the isolation transformer through the inverter component, and obtain the stepped-down second alternating current on its own secondary side after being stepped down by the isolation transformer, and is also used to transmit the stepped-down second alternating current to the ship power terminal through the power busbar of the power bus terminal; The ship power terminal includes a first propulsion power unit, a second propulsion power unit and a daily power load, the energy storage terminal includes a first lithium battery pack, a second lithium battery pack and a third lithium battery pack, and the inverter assembly includes a first inverter unit, a second inverter unit and a third inverter unit; The lithium battery discharge module is used for, when the hydrogen fuel cell reaction terminal stops generating direct current, inputting the second direct current generated by the first lithium battery pack into the first inverter unit for inversion into the corresponding second alternating current, and for supplying power to the first propulsion power unit through the power busbar of the power bus terminal after reducing the voltage of the second alternating current through the isolation transformer; When the hydrogen fuel cell reaction terminal stops generating direct current, the second direct current generated by the second lithium battery pack is input into the second inverter unit for inversion into a corresponding second alternating current, and the second alternating current is stepped down by the isolation transformer and then supplied to the second propulsion power unit through the power busbar of the power bus terminal; When the hydrogen fuel cell reaction terminal stops generating direct current, the second direct current generated by the third lithium battery pack is input into the third inverter unit for inversion into the corresponding second alternating current, and the second alternating current is stepped down by the isolation transformer and then supplied to the daily power load through the power bus of the power bus terminal.

6. A ship power control system according to claim 5, characterized in that: The lithium battery energy storage charging module is used to calculate the difference between the power of the first direct current generated by the hydrogen fuel cell reaction terminal through the electrochemical reaction of hydrogen and the power consumption of the ship power terminal when the power of the first direct current generated by the hydrogen fuel cell reaction terminal through the electrochemical reaction of hydrogen is greater than the power consumption of the ship power terminal, and obtain the remaining power value. It is also used to distribute the direct current corresponding to the remaining power value to the direct current input unit of the power bus terminal, and input it to the energy storage terminal through the built-in direct current busbar of the power bus terminal to charge the energy storage terminal; wherein the remaining power is the first direct current generated by the hydrogen fuel cell reaction terminal through the electrochemical reaction of hydrogen, and the power demand of the ship power terminal is met.

7. A ship power control system according to claim 6, characterized in that: The lithium battery energy storage charging module is also used to utilize the shore-based AC power grid power supply terminal to input the AC power after boosting and rectifying into the DC input unit of the power bus terminal through its own charging and discharging unit, and is also used to utilize the DC input unit to input the boosted and rectified AC power into the energy storage terminal through the built-in DC busbar of the power bus terminal to charge the energy storage terminal.

8. A ship power control system according to claim 7, characterized in that: It also includes a shore-based power supply module, which is used to input the city power into the power busbar of the power bus terminal through the shore-based AC power grid power supply terminal, and supply power to the ship power terminal through the power busbar.

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