CN115743491A - Multi-power-source ship direct-current electric propulsion system and working method thereof - Google Patents
Multi-power-source ship direct-current electric propulsion system and working method thereof Download PDFInfo
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Abstract
The invention discloses a multi-power-source-powered ship direct-current electric propulsion system and a working method thereof. The power supply module comprises a fuel cell pack, a lithium cell pack, a super capacitor, a solar photovoltaic power generation assembly and a wind power generation device. The energy management module acquires information through the direct current power distribution device; the energy output device is used for reasonably distributing the energy output of the fuel cell set, the lithium cell set, the super capacitor, the solar photovoltaic power generation assembly and the wind power generation set. The integrated power distribution system has the advantages of high integration level, low equipment cost, small occupied area and low weight, and can flexibly distribute the power output of the fuel cell and the composite energy storage module when the load changes, so as to provide enough energy output for the load. The energy management module is adopted, so that the fuel cell and the composite energy storage device can output more efficiently, and the energy utilization efficiency of the whole system can be obviously improved.
Description
Technical Field
The invention relates to the technical field of ships, in particular to a multi-power-source ship direct-current electric propulsion system and a working method thereof.
Background
At present, the power source of ships is mainly diesel engines, gas turbines and the like, and the ships can provide power and simultaneously emit a large amount of atmospheric pollutants such as sulfur oxides, carbon dioxide, nitrogen oxides, particulate matters and the like, thereby causing serious pollution to the environment and the atmosphere. In recent years, with the increasing maturity of power electronic technology, variable frequency motor manufacturing technology, alternating current motor variable frequency speed regulation technology and computer control technology, the ship electric propulsion system has the advantages of economy, maneuverability, safety, environmental protection and the like, so that the ship loading rate is increased year by year. In the development process of the electric propulsion ship, an alternating current power system becomes a mainstream scheme of the current electric propulsion ship by the advantages of mature function block technology, rapid development and the like. However, the ac power system also has problems of complex control and harmonic pollution, which have long plagued the development of electrically propelled ships. With the progress of controllable rectification technology and chopping inversion technology and the rise of energy price, the development of a ship direct-current networking power system draws attention.
The main reasons that early ac electric propulsion systems outperformed dc electric propulsion were that ac electric systems were able to easily change voltage by using transformers, whereas dc electric systems were difficult to implement voltage changes and traditional dc systems were costly to maintain. However, the rapid development of power electronics technology in recent years has made it possible for power electronics to easily implement voltage transformation. Therefore, the advantages of the ship direct current electric propulsion system are more and more obvious, and the main advantages are as follows:
(1) The efficiency of the diesel generator is improved and the fuel consumption is saved. In a marine ac power system, a diesel engine is connected to a constant speed generator and operates at a specified power system frequency. When the ship power system is in a low-load demand, the diesel generator works at a low-load constant rotating speed, the energy efficiency is greatly reduced, and a large amount of pollution gas can be discharged. And by adopting the direct current power system, the diesel generator can adjust the rotating speed according to the load required by the power system, so that the diesel engine is positioned at the optimal working condition point, and the energy efficiency of the system is improved.
(2) The system integration level is improved, the space is saved, and the weight is reduced. After an alternating current power system is transformed into a direct current system, an alternating current distribution board, a propulsion transformer and a THD filter do not need to be configured.
(3) The power transmission loss is reduced. The frequency of the direct current power grid is 0Hz, the cable cannot generate a skin effect, and the applicability to the access of new energy equipment and an energy storage system is better.
In order to achieve the purposes of energy conservation and emission reduction and meeting power requirements, more and more ships adopt a pure electric propulsion mode, adopt cleaner power sources to replace traditional diesel engine power generation modes, such as photovoltaic power generation, LNG power generation, fuel cells, storage batteries and the like, and are connected to a ship power system through clean energy power generation to provide power.
When photovoltaic power generation, LNG power generation, a fuel cell, and a storage battery are used as power supply units, the operation conditions of the power supply units are important for smooth operation of the entire power system, the service life of the relevant systems, and safety of the equipment, so that it is important to optimize energy management of the ship.
Disclosure of Invention
The invention aims to provide a ship direct-current electric propulsion system with multiple power supplies, which can improve the comfort level of a ship, is beneficial to environmental protection and can finish charging in a short time. The propulsion system of the present invention converts the chemical energy of hydrogen into electrical energy by means of a fuel cell and stores it in a hybrid power source. Photovoltaic power generation sets and wind power generation devices are capable of collecting and converting various forms of energy into electrical energy. And then the composite power supply generates electric energy to supply the propulsion motor with the electric energy to drive the propeller to rotate, so that power is provided for the running of the ship, and the energy conversion rate is improved.
The invention discloses a multi-power-supply-power ship direct-current electric propulsion system which comprises a power supply module, an electric propulsion device, a charging device, a direct-current bus, an energy conversion device, a direct-current power distribution device and an energy management module.
The power supply module comprises a fuel cell pack, a lithium cell pack, a super capacitor, a solar photovoltaic power generation assembly and a wind power generation device.
The electric propulsion device comprises a frequency converter, a propulsion motor, an operation console, a shafting and a propeller.
The charging device comprises a direct current charging device and an alternating current charging device.
The direct current bus refers to the fact that all energy sources are gathered on the bus in a direct current mode and then sent to the electric propulsion device. The bus is a junction of the energy system.
The energy conversion device includes a bidirectional DC/DC converter, a unidirectional DC/DC converter, a DC/AC converter, and an inverter.
The energy management module reasonably distributes the energy output of the fuel battery pack, the lithium battery pack, the super capacitor, the solar photovoltaic power generation assembly and the wind power generation device according to the power load requirement.
The invention adopts a common direct current bus system for networking, the fuel cell group generates chemical reaction to convert chemical energy into electric energy, and the generated current passes through the DC/DC converter and then is connected with the common direct current bus.
The propulsion motor is connected with the common direct current bus through the inverter, so that the generated energy of the fuel cell stack is adjusted when the ship load changes; the ship power grid can work under normal voltage, and the integration and coordination of the two links of power generation and promotion are improved.
The direct current bus is connected with the daily load of the ship through the inverter. The direct current power supply provided by the ship common direct current bus is inverted and converted into alternating current output with adjustable frequency and voltage, and an adjustable power supply is provided for load equipment, so that the load equipment can work normally.
The fuel cell set is used as a power generation module, and the direct current generated by the fuel cell set is directly connected with a direct current bus through a DC/DC converter.
The super capacitor and the lithium battery pack form a composite energy storage device, and a parallel topological structure is adopted. The composite energy storage device is directly connected with the direct current bus through the DC/DC converter.
The solar photovoltaic power generation assembly comprises a solar panel, a sampling circuit, an amplifying circuit, a conversion device and the like, and is incorporated into the direct current bus through the power transmission network.
The wind power generation device comprises a columnar wind power acquisition structure, a sampling circuit, an amplifying circuit and a conversion device, and is merged into a direct current bus through a power transmission network.
The fuel cell pack, the photovoltaic generator set and the wind power generation device can directly charge the lithium cell pack by connecting the generated electric energy with the alternating current charging device.
The propulsion motor is connected with the direct current bus through the inverter and is connected with the propeller through the shafting.
The direct current distribution device is an electric energy management system of a ship, pre-draws a load power curve to obtain power loads required by different time periods, namely the direct current distribution device is connected with controllers of a propulsion motor, a propulsion system and other load systems to monitor the electric energy load requirements of the whole ship; the monitoring result of the direct current distribution device is used for setting the charge and discharge power of the fuel cell and the hybrid power supply, so that the power requirement of each load can be met.
The energy management module aims at achieving the minimum energy consumption, the minimum emission and the maximum cruising ability and ensuring the stable work of a ship power system.
A working method of a multi-power-source ship direct-current electric propulsion system comprises the following steps:
in the normal sailing process, the working conditions of the ship electric propulsion system with multiple power supplies are mainly divided into two types, a fuel battery pack is used as a main power supply, a lithium battery pack, a photovoltaic generator set and a wind power generation device are used as auxiliary power supplies, and the working condition is a working mode 1; the lithium battery pack is used as a main power source, the fuel battery pack, the photovoltaic generator set and the wind power generation device are used as auxiliary power sources, and the working condition is a working mode 2.
In the working mode 1, the fuel cell pack in the system always runs in the optimal efficiency working state, the output power Pe of the fuel cell pack is a fixed value, when the ship required power P1 is smaller than the power Pe provided by the fuel cell pack, the fuel cell pack can provide energy for ships and can also charge a lithium cell pack and a super capacitor, and the photovoltaic generator set and the wind power generation device work normally.
In the working mode 2, when the required power P1 of the ship is greater than the power Pe provided by the fuel cell pack, the energy of the system is supplemented by discharging of the lithium cell pack, and according to the working characteristics of the lithium cell pack, when the state of charge (SOC) of the system can meet the requirement of the system power, the lithium cell pack provides all energy, and after the SOC is reduced to a certain degree, the fuel cell pack, the photovoltaic generator set and the wind power generation device are needed to meet the power requirement.
In the navigation process, the curve is divided into corresponding high-frequency, stable and low-frequency parts according to a power demand curve, and then power is output according to the corresponding working module. The input power Of the rule is low-frequency power, the State Of Charge (SOC) Of the super capacitor is controlled within a reasonable range, instantaneous high-power discharge Of the lithium battery pack is prevented through different output strategies, and the health Of the lithium battery pack is protected. Wherein Pload is the desired power load; PLload is low frequency load power; pbmin is the lowest value of the output power of the lithium battery pack; pbmax is the maximum value of the output power of the lithium battery pack; puc undertakes power for the super capacitor; pbat is the power born by the lithium battery pack, and for the photovoltaic generator set and the wind power generation device, the working modes of the photovoltaic generator set and the wind power generation device are relatively stable, the photovoltaic generator set and the wind power generation device can be in a power generation state for a long time, the change caused by the load change of power demand can not be too large, and the start-stop time can be adjusted only by the corresponding control module.
The method comprises the following specific steps:
(1) And according to the power demand curve, dividing the curve into corresponding high-frequency, stable and low-frequency parts, and then outputting power according to the corresponding working module.
(2) The input power Of the rule is low-frequency power, the State Of Charge (SOC) Of the super capacitor is controlled within a reasonable range, instantaneous high-power discharge Of the lithium battery pack is prevented through different output strategies, and the health Of the lithium battery pack is protected. Wherein Pload is the required power load; PLload is the low frequency load power; pbmin is the lowest value of the output power of the lithium battery pack; pbmax is the maximum value of the output power of the lithium battery pack; the Puc bears power for the super capacitor; pbat is the power borne by the lithium battery pack.
(3) When the SOC of the super capacitor is more than 90% and PLload is less than Pbmin, the lithium battery pack does not work, and the super capacitor bears low-frequency load; when Pbmax is more than PLload and more than Pbmin, the lithium battery pack only bears low-frequency load.
(4) When the SOC is more than or equal to 70% and less than or equal to 90% of the super capacitor and PLload is less than Pbmin, the super capacitor enters a charging mode 2; when Pbmax is more than PLload and is more than Pbmin, the lithium battery pack outputs, and the super capacitor enters a charging mode 2; when PLload is larger than Pbmax, the output power of the lithium battery pack is limited, and the super capacitor is not charged.
(5) When the SOC of the super capacitor is less than 70 percent and PLload is less than Pbmin, the super capacitor enters a charging mode 1; when Pbmax is more than PLload and is more than Pbmin, the lithium battery pack outputs, and the super capacitor enters a charging mode 1; when PLload is larger than Pbmax, the output power of the lithium battery pack is limited, and the super capacitor is not charged.
When the method is applied to actual navigation, the detailed energy management rule is as follows:
when the ship is landed: the shore power is used for charging the lithium battery pack and the super capacitor in the system, so that the charging energy of the lithium battery pack and the super capacitor is ensured;
when the device is started: the super capacitor is matched with the fuel battery pack and the lithium battery pack to supplement larger energy at the moment of starting;
when braking, the brake is carried out: the super capacitor is used for rapidly recovering energy;
this rule still can manage solar photovoltaic power generation subassembly and wind power generation set and lithium cell group according to the power supply condition of boats and ships to guarantee boats and ships normal work, it mainly includes two kinds of circumstances:
when the power generation capacity of the solar photovoltaic power generation assembly and the wind power generation device is sufficient, the solar photovoltaic power generation assembly and the wind power generation device simultaneously supply power to the lithium battery pack and the whole propulsion system;
when the load of the whole ship is larger than the power supply of the fuel battery pack and the lithium battery pack under the working condition, the solar photovoltaic power generation assembly and the wind power generation device mainly supply power to the propulsion system.
Technical effects
The invention has higher integration level, lower equipment cost, less equipment quantity compared with the propulsion of an alternating current power system, small occupied area and low weight, and can flexibly distribute the power output of the fuel cell and the composite energy storage module when the load changes so as to provide enough energy output for the load.
The invention adopts the super capacitor and the lithium battery pack to form the composite energy storage device, can ensure the normal work of the battery, simultaneously enables the battery pack to keep relatively stable output, and prolongs the service life of the battery pack. The energy management module is adopted, so that the fuel cell and the composite energy storage device can output more efficiently, and the energy utilization efficiency of the whole system is improved.
The invention does not use the traditional diesel engine generator set, but adopts various clean energy sources as power sources, has the effects of energy conservation and emission reduction, and can reduce the fuel consumption and the operation cost.
Drawings
FIG. 1 is a block diagram of the present invention;
FIG. 2 is a schematic diagram of the energy management structure of the present invention;
FIG. 3 is a schematic of the power distribution of the present invention;
FIG. 4 is a schematic of the low frequency power output of the present invention;
FIG. 5 is a schematic diagram of the energy management rules of the present invention;
FIG. 6 is a diagram of various power supply modules of the present invention;
FIG. 7 is a simulation of the system architecture for multiple power sources of the present invention;
FIG. 8 is a graph of load versus time for the present invention;
FIG. 9 is a graph of discharge current versus time for a battery of the present invention;
FIG. 10 is a graph of discharge voltage versus time for a battery of the present invention;
FIG. 11 is a graph of the charge of a lithium battery of the present invention as a function of time;
FIG. 12 is a graph of discharge current of a supercapacitor of the present invention as a function of time;
FIG. 13 is a graph of the voltage across the supercapacitor of the present invention as a function of time;
fig. 14 is a graph of the output of a fuel cell stack of the present invention;
fig. 15 is a graph of the total output of the system of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described below with reference to the accompanying drawings.
Example 1, as shown in fig. 1 to 5, a multi-power-source ship direct-current electric propulsion system includes a fuel cell module, a super capacitor, a lithium battery module, a solar photovoltaic power generation assembly, a wind power generation device, a direct-current power distribution device, a bidirectional DC/DC converter, a unidirectional DC/DC converter, a DC/AC converter, an inverter, a charging device, an electric propulsion device (a motor, a propeller, etc.), an energy management module, and a corresponding power transmission network and power electronics, etc.
The Fuel Cell module is used as a main electric energy source of the whole ship electric propulsion system, and a PEMFC (Proton Exchange Membrane Fuel Cell) Fuel Cell stack consisting of PEMFCs (Proton Exchange Membrane Fuel cells) is selected. Two PEMFC fuel cell stacks are deployed onboard the vessel and incorporated into the DC bus through a unidirectional DC/DC converter.
And the super capacitor and the lithium battery module form a composite () power supply.
The lithium battery module includes a lithium battery pack composed of a plurality of lithium batteries.
On the aspect of corresponding selection, the lithium battery with wider voltage range, specific power, specific energy and cycle service life is selected in the aspect of storage batteries. And the super capacitor with faster charge and discharge and larger capacity is selected in the aspect of capacitance.
By controlling the charging and discharging of the super capacitor, the current fluctuation of the lithium battery pack is slowed down, and the cycle service life of the lithium battery pack is prolonged.
The composite power supply plays a role in peak clipping and valley filling, so that the fuel cell can work in a high-efficiency interval as far as possible, and the lithium battery module and the super capacitor adopt a parallel topological structure.
On the lithium battery module, a bidirectional DC/DC converter is selected to complete the current transmission, and the bidirectional DC/DC converter is used for stabilizing the output voltage of the fuel battery and the terminal voltage of the hybrid power supply.
The inverter is used for converting direct current into alternating current and supplying the alternating current to a load.
The solar photovoltaic power generation assembly comprises a photovoltaic cell panel, a sampling circuit, an amplifying circuit, a conversion device and the like and is used for converting solar energy into electric energy, wherein the photovoltaic cell panel absorbs the optical energy and converts the optical energy into unstable direct current electric energy, and the unstable direct current electric energy is converted into stable direct current through the sampling circuit, the amplifying circuit and the unidirectional DC/DC converter and is transmitted to a direct current bus network.
The wind power generation device comprises a columnar wind power acquisition structure, a sampling circuit, an amplifying circuit, a conversion device and the like, and is used for converting wind energy into electric energy. The columnar wind power collecting structure can collect wind power in all directions, improves the power generation efficiency, and then converts the wind power into stable direct current through the sampling circuit, the amplifying circuit and the unidirectional DC/DC converter and transmits the stable direct current to the direct current bus network.
When the power generation capacity of the solar photovoltaic power generation assembly and the wind power generation device is sufficient and the load power demand is not large, the solar photovoltaic power generation assembly and the wind power generation device can be connected with a direct current charging device of the lithium battery pack through a DC/AC converter to charge the lithium battery pack.
The working principle of the energy management module is mainly as follows:
the PEMFC fuel battery pack in the system always runs under the working condition of the optimal efficiency, the output power of the PEMFC fuel battery pack is constant, and when the required power of a ship is less than the power supplied by the PEMFC fuel battery pack, the PEMFC fuel battery pack can supply energy to the ship and can also charge a lithium battery pack and a super capacitor.
The solar photovoltaic power generation assembly and the wind power generation device work normally.
When the required power of the ship is larger than the power provided by the PEMFC, the energy of the system is supplemented by discharging of the lithium battery pack, and according to the working characteristics of the lithium battery pack, when the SOC can meet the requirement of the system power, the lithium battery pack provides all energy, and when the SOC is reduced to a certain degree, the fuel battery pack, the solar photovoltaic power generation assembly and the wind power generation device are needed to meet the power requirement.
The current required power of the ship is obtained and divided into three sections, namely a middle section and a low section, so that the working modes of all modules (a fuel cell module, a super capacitor, a lithium battery module, a solar photovoltaic power generation assembly and a wind power generation device) are determined. Then, the SOC value of the lithium battery is obtained through the CAN bus, an energy control rule is provided, the reasonable distribution of multiple energies in the ship electric propulsion system is realized, and the utilization efficiency of the energy is improved.
Multiple simulation experiments were performed and the data obtained are shown in figures 8-15.
First, the load curve is divided into high, low and middle frequency bands according to the energy management rule, as shown in fig. 8. The model was then run, resulting in data.
According to the experimental data, the load curve is divided by the system under the load condition facing multiple working conditions through the energy management rule, the output power of the corresponding modules is reasonably distributed, the power requirement can be well met, the super capacitor and the lithium battery pack form the energy storage device with good working effect, the charge state of the lithium battery pack is stable, and the service life of the battery is prolonged.
In example 3, a solid oxide fuel cell stack was added to example 1, and the stack was electrically connected to a dc bus.
Furthermore, the above embodiments are not intended to limit the invention, which includes but is not limited to the above detailed description. Therefore, the protection scope of the present patent should be defined by the appended claims.
Claims (8)
1. A ship direct-current electric propulsion system with multiple power supplies is characterized in that: the system comprises a power supply module, an electric propulsion device, a charging device, a direct current bus, an energy conversion device, a direct current distribution device and an energy management module;
the power supply module comprises a fuel cell pack, a lithium cell pack, a super capacitor, a solar photovoltaic power generation assembly and a wind power generation device;
the lithium battery pack and the super capacitor adopt a parallel topological structure;
the energy conversion device comprises a bidirectional DC/DC converter, a unidirectional DC/DC converter, a DC/AC converter and an inverter;
the direct current bus is characterized in that all energy sources are collected on the bus in a direct current mode and then are sent to the electric propulsion device;
the energy management module acquires information through the direct current power distribution device; the energy output device is used for reasonably distributing the energy output of the fuel cell set, the lithium cell set, the super capacitor, the solar photovoltaic power generation assembly and the wind power generation set.
2. A multi-power-source powered marine dc electric propulsion system as claimed in claim 1, further comprising: the fuel cell stack is used as a main power supply source and comprises a hydrogen fuel storage tank, a heating device and a fuel cell; the fuel cell stack is incorporated into the DC bus by a unidirectional DC/DC converter.
3. A multi-power-source powered marine dc electric propulsion system as claimed in claim 1, further comprising: the lithium battery pack and the super capacitor form a composite power supply, and the lithium battery pack is merged into a direct current bus through a bidirectional DC/DC converter; the hybrid power supply plays a role in peak clipping and valley filling and is used for ensuring that the fuel cell stack works in a high-efficiency interval.
4. A multi-power-source powered marine dc electric propulsion system as claimed in claim 1, further comprising: the direct current distribution device is an electric energy management system of a ship, pre-draws a load power curve to obtain power loads required by different time periods, namely the direct current distribution device is connected with controllers of a propulsion motor, a propulsion system and other load systems to monitor the electric energy load requirements of the whole ship; the monitoring result of the direct current distribution device is used for setting the charge and discharge power of the fuel cell and the hybrid power supply, so that the power requirement of each load can be met.
5. A multi-power-source marine dc electric propulsion system of claim 1, characterized in that:
the solar photovoltaic power generation assembly comprises a photovoltaic cell panel, a sampling circuit and an amplifying circuit and is used for converting solar energy into electric energy, wherein the photovoltaic cell panel absorbs the optical energy and converts the optical energy into unstable direct current electric energy, and then the unstable direct current electric energy is converted into stable direct current through the sampling circuit, the amplifying circuit and the unidirectional DC/DC converter and is transmitted to a direct current bus network.
6. A multi-power-source powered marine dc electric propulsion system as claimed in claim 1, further comprising: the wind power generation device is used for converting wind energy into electric energy; the wind power generation device comprises a columnar wind power acquisition structure, a sampling circuit and an amplifying circuit, and is used for converting wind energy into electric energy; the columnar wind power acquisition structure can acquire wind power in all directions, and then the wind power is converted into stable direct current through the sampling circuit, the amplifying circuit and the unidirectional DC/DC converter and is transmitted to the direct current bus network.
7. A multi-power-source marine dc electric propulsion system of claim 1, characterized in that: the electric propulsion device adopts a pure electric propulsion system, comprises a propulsion motor, converts electric energy into mechanical energy with adjustable torque and rotating speed by the operation of the propulsion motor, and then drives a propeller to rotate so as to realize forward, backward or steering operation of the ship.
8. A method of operating a multi-source powered marine dc electric propulsion system as claimed in claim 1, including the steps of:
(1) Obtaining the current required power of the ship;
(2) Obtaining the SOC value of the lithium battery through a CAN bus;
(3) Providing an energy control rule for reasonably distributing multiple energies in the ship electric propulsion system and improving the utilization efficiency of the energies;
the method comprises the following specific steps:
when the ship is landed: the shore power is used for charging the lithium battery pack and the super capacitor in the system, so that the charging energy of the lithium battery pack and the super capacitor is ensured;
when the device is started: the super capacitor is matched with the fuel battery pack and the lithium battery pack to supplement the instant energy during starting;
during braking: the super capacitor is used for quickly recovering energy;
this rule still can manage solar photovoltaic power generation subassembly and wind power generation set and lithium cell group according to the power supply condition of boats and ships to guarantee boats and ships normal work, it mainly includes two kinds of circumstances:
when the power generation capacity of the solar photovoltaic power generation assembly and the wind power generation device is sufficient, the solar photovoltaic power generation assembly and the wind power generation device simultaneously supply power to the lithium battery pack and the whole propulsion system;
when the load of the whole ship is larger than the power supply of the fuel battery pack and the lithium battery pack under the working condition, the solar photovoltaic power generation assembly and the wind power generation device mainly supply power to the propulsion system.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117879128A (en) * | 2024-03-13 | 2024-04-12 | 西北工业大学宁波研究院 | Energy management system and management strategy of large container ship composite energy system |
| CN117944862A (en) * | 2024-03-27 | 2024-04-30 | 山东科技大学 | Ship oil-hydrogen photoelectric composite power system and energy management method |
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2022
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117879128A (en) * | 2024-03-13 | 2024-04-12 | 西北工业大学宁波研究院 | Energy management system and management strategy of large container ship composite energy system |
| CN117879128B (en) * | 2024-03-13 | 2024-05-10 | 西北工业大学宁波研究院 | Energy management system and management strategy of large container ship composite energy system |
| CN117944862A (en) * | 2024-03-27 | 2024-04-30 | 山东科技大学 | Ship oil-hydrogen photoelectric composite power system and energy management method |
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