Ship power system selection method, device and storage medium

Abstract

The present invention discloses a method, device and storage medium for selecting a ship power system, and relates to the technical field of ship design. The present application performs simulation through an engine MAP diagram and a motor MAP diagram, and obtains fitness under different target hybrid ratios in combination with target optimization weights, and then performs simulation again under a specified target hybrid ratio with energy storage system capacity as an optimization variable, and obtains fitness under different energy storage system capacities in combination with target optimization weights, and then determines the selection result based on the fitness under different target hybrid ratios and the fitness under different energy storage system capacities. The present application can provide designers with effective ship selection guidance, thereby optimizing ship power systems.

Description

Technical Field

[0001] The present invention relates to the technical field of ship design, and in particular to a ship power system selection method, device and storage medium. Background Art

[0002] Fuel engines and electric motors together form the ship powertrain. The essence of the ship hybrid system is to achieve the purpose of driving the ship through timely adjustment of the fuel engine and electric motor power. The low-speed characteristics of the electric motor are good. Combining the electric motor with the fuel engine can improve the problems of poor low-speed kinetic energy and exhaust emissions of the fuel engine. The emergence of the ship hybrid system can improve the technical problems existing in the current pure electric drive system, and it is also a better solution when the fuel cell technology is not yet mature. The power system selection of hybrid ships affects the performance of the ship's drive, energy consumption, etc. At present, there is a lack of a hybrid system selection method to provide designers with effective selection guidance to optimize the ship's power system. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a ship power system selection method, device and storage medium, which can provide designers with effective ship selection guidance and optimize the ship power system.

[0004] On the one hand, an embodiment of the present invention provides a method for selecting a ship power system, comprising the following steps:

[0005] Acquire an engine MAP diagram, a motor MAP diagram, a simulation operation strategy, a hybrid ratio set, a navigation condition, and an optimization target weight, wherein the hybrid ratio set includes a target hybrid ratio, and the simulation operation strategy is used to characterize a mapping relationship between a power demand of a ship and an operating mode of a power system;

[0006] According to the navigation condition, the simulation operation strategy, the engine MAP diagram and the motor MAP diagram, the ship power system is simulated to obtain first simulation results under multiple simulated hybrid ratios;

[0007] Determining that the target hybrid ratios in the hybrid ratio set all match at least one of the simulated hybrid ratios obtained after simulation, and determining a second simulation result of the target hybrid ratio;

[0008] Determining fitness under a plurality of the target hybrid ratios according to a plurality of the second simulation results and the optimization target weights;

[0009] Optimizing the simulation operation strategy based on the fitness of the plurality of target hybrid ratios;

[0010] Based on the specified target hybrid ratio, simulating the ship power system according to the navigation condition, the simulation operation strategy, the engine MAP diagram and the motor MAP diagram to obtain third simulation results under multiple energy storage system capacities;

[0011] Determine the fitness under the multiple energy storage system capacities according to the multiple third simulation results and the optimization target weights;

[0012] The selection result is determined based on the fitness under the multiple target hybrid ratios and the fitness under the multiple energy storage system capacities.

[0013] According to some embodiments of the present invention, the hybrid ratio set is obtained by the following steps:

[0014] Obtaining a preset hybrid ratio range and hybrid ratio optimization accuracy;

[0015] A plurality of target hybrid ratios are obtained by taking values ​​in the hybrid ratio interval according to the hybrid ratio optimization accuracy.

[0016] According to some embodiments of the present invention, the simulation operation strategy includes:

[0017] When the engine thermal efficiency is lower than the preset thermal efficiency value and the system power demand is less than the preset power value, the pure electric propulsion mode is adopted;

[0018] When the engine thermal efficiency is lower than the preset thermal efficiency value and the system power demand is greater than the preset power value, the hybrid propulsion mode is adopted;

[0019] When the engine thermal efficiency is greater than the preset thermal efficiency value, the engine propulsion mode is adopted.

[0020] According to some embodiments of the present invention, simulating the ship power system according to the navigation condition, the simulation operation strategy, the engine MAP diagram and the motor MAP diagram to obtain the first simulation results under multiple simulated hybrid ratios includes the following steps:

[0021] Determine the system required power at the current time step according to the navigation condition;

[0022] Determining the working mode of the current time step of the ship power system through the simulation operation strategy according to the system demand power;

[0023] The ship power system is simulated according to the working mode, the engine MAP diagram and the motor MAP diagram to obtain first simulation results under multiple simulated hybrid ratios.

[0024] According to some embodiments of the present invention, simulating the ship power system according to the working mode, the engine MAP map and the motor MAP map to obtain first simulation results under multiple simulated hybrid ratios includes the following steps:

[0025] When the working mode is the pure electric propulsion mode, the best motor efficiency that meets the current system power requirement is determined according to the motor MAP diagram, and the current time step is simulated according to the motor working condition corresponding to the best motor efficiency;

[0026] When the working mode is the engine propulsion mode, determine whether the previous time step is the engine propulsion mode; when the previous time step is not the engine propulsion mode, set the engine speed to idle speed and determine the engine power with the current best engine thermal efficiency according to the motor MAP diagram, and the part of the engine power that cannot meet the system power requirement is supplemented by the motor power until the engine power meets the system power requirement for the current time step simulation; when the previous time step is the engine propulsion mode, determine the first speed variable interval in the previous time step, and determine the engine power with the best engine thermal efficiency in the first speed variable interval, and the part of the engine power that cannot meet the system power requirement is supplemented by the motor power until the engine power meets the system power requirement for the current time step simulation;

[0027] When the working mode is the hybrid mode, the current second variable speed range of the engine is determined, and the engine power with the best engine thermal efficiency in the second variable speed range is determined. The part of the engine power that cannot meet the system demand power is supplemented by the motor power to perform simulation of the current time step.

[0028] According to some embodiments of the present invention, determining the fitness under the plurality of target hybrid ratios according to the plurality of the second simulation results and the optimization target weights comprises the following steps:

[0029] Normalizing the weights of the plurality of optimization targets;

[0030] Determine a fitness function according to the normalized weights of the plurality of optimization objectives;

[0031] The fitness under the multiple target hybrid ratios is determined according to the fitness function and the multiple second simulation results.

[0032] According to some embodiments of the present invention, determining the selection result based on the fitness under the multiple target hybrid ratios and the fitness under the multiple energy storage system capacities comprises the following steps:

[0033] The target hybrid ratio and energy storage system capacity with a fitness greater than a preset fitness are selected as the selection result.

[0034] According to some embodiments of the present invention, the ship power system selection method further includes the following steps:

[0035] Determine emission curves, energy consumption curves and economy curves under different fitness levels according to the plurality of second simulation results;

[0036] The selection result is corrected according to the emission curve, the energy consumption curve and the economy curve.

[0037] On the other hand, an embodiment of the present invention further provides a method and device for selecting a ship power system, comprising:

[0038] at least one processor;

[0039] at least one memory for storing at least one program;

[0040] When the at least one program is executed by the at least one processor, the at least one processor implements the ship power system selection method as described above.

[0041] On the other hand, an embodiment of the present invention further provides a computer-readable storage medium, wherein the computer-readable storage medium stores computer-executable instructions, and the computer-executable instructions are used to enable a computer to execute the ship power system selection method as described above.

[0042] The above technical solution of the present invention has at least one of the following advantages or beneficial effects: the present application simulates through the engine MAP diagram and the motor MAP diagram, combines the target optimization weight to obtain the fitness under different target hybrid ratios, and then simulates again under the specified target hybrid ratio with the energy storage system capacity as the optimization variable, combines the target optimization weight to obtain the fitness under different energy storage system capacities, and then determines the selection result based on the fitness under different target hybrid ratios and the fitness under different energy storage system capacities. The present application can provide designers with effective ship selection guidance, thereby optimizing the ship power system. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 is a flow chart of a method for selecting a ship power system provided by an embodiment of the present invention;

[0044] Figure 2 It is a schematic diagram of a ship power system selection device provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0045] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar components or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0046] In the description of the present invention, it should be understood that descriptions involving orientation, such as up, down, left, right, etc., the orientations or positional relationships indicated are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0047] In the description of the present invention, if there is a description of first, second, etc., it is only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the sequence of the indicated technical features.

[0048] The embodiment of the present invention provides a method for selecting a ship power system, referring to Figure 1 The ship power system selection method of the embodiment of the present invention includes but is not limited to step S110, step S120, step S130, step S140, step S150, step S160, step S170 and step S180.

[0049] Step S110, obtaining an engine MAP diagram, a motor MAP diagram, a simulation operation strategy, a hybrid ratio set, a navigation condition, and an optimization target weight, wherein the hybrid ratio set includes a target hybrid ratio, and the simulation operation strategy is used to characterize a mapping relationship between a power demand of the ship and an operating mode of the power system;

[0050] Step S120, simulating the ship power system according to the navigation condition, the simulation operation strategy, the engine MAP diagram and the motor MAP diagram to obtain first simulation results under multiple simulated hybrid ratios;

[0051] Step S130, determining that the target hybrid ratios in the hybrid ratio set all match at least one simulated hybrid ratio obtained after simulation, and determining a second simulation result of the target hybrid ratio;

[0052] Step S140, determining fitness under multiple target hybrid ratios according to multiple second simulation results and the optimization target weights;

[0053] Step S150, optimizing the simulation operation strategy based on the fitness of multiple target hybrid ratios;

[0054] Step S160, based on the specified target hybrid ratio, simulating the ship power system according to the navigation condition, the simulation operation strategy, the engine MAP diagram and the motor MAP diagram to obtain third simulation results under multiple energy storage system capacities;

[0055] Step S170, determining the fitness under multiple energy storage system capacities according to multiple third simulation results and optimization target weights;

[0056] Step S180, determining a selection result based on the fitness under multiple target hybrid ratios and the fitness under multiple energy storage system capacities.

[0057] In this embodiment, the user can input relevant data for simulation, and the input data may include but is not limited to the selected engine MAP diagram, the selected motor's universal characteristic diagram, the energy storage system MAP diagram, the navigation conditions used to characterize the relationship between the system's required power and time, the target engine speed and torque range, the target motor speed and torque range, the hybrid ratio range, the expected system installed total power, the optimization target weight, the hybrid ratio optimization accuracy, the time step, the maximum acceleration of the engine speed, the transmission efficiency of the transmission system, the simulation operation strategy, the energy consumption conversion coefficient, the economic coefficient, the ship's hybrid power system structure, the target channel data and the expected optimization parameters, etc. The expected optimization parameters may be the energy storage system capacity, the installed total power and the hybrid ratio, etc.

[0058] Among them, the engine MAP diagram is used to characterize the correspondence between the engine's torque, speed and fuel consumption, thermal efficiency, exhaust emissions and other parameters; the motor MAP diagram is used to characterize the correspondence between the motor's torque, speed and voltage, current, electric power and other parameters; the energy storage system MAP diagram is used to characterize the correspondence between the current energy storage system voltage charging and discharging state and the current nuclear power state of the energy storage system.

[0059] The simulation operation strategy refers to the coordinated operation of the decision motor and the engine during the simulation process. It can be a basic rule-based energy management strategy. If necessary, other energy management strategies can be selected to improve the accuracy of system simulation. The simulation operation strategy is based on the thermal efficiency of the engine MAP diagram. When the system requires power and speed, the ship's hybrid power system is in the working mode. This simulation operation strategy does not consider the capacity of the energy storage system. The hybrid ratio is used to characterize the power ratio of the engine and the motor.

[0060] The target optimization weight is used to characterize the importance of the user's optimization target. For example, the optimization targets may include fuel consumption, power consumption, thermal efficiency, and exhaust emissions, and the corresponding weights may be 7, 7, 4, and 8. The fitness is calculated by the fitness function and is used to characterize the difference between the current simulated ship state and the target state.

[0061] After obtaining relevant data, it can be detected whether the user has entered a target engine speed and torque range or a target motor speed and torque range. If the user has entered a target engine speed and torque range, the engine MAP diagram can be scaled according to the target engine speed and torque range, otherwise the engine MAP diagram will not be scaled. If the user has entered a target motor speed and torque range, the motor MAP diagram can be scaled according to the target motor speed and torque range, otherwise the motor MAP diagram will not be scaled. Then it can be detected whether the user has entered a hybrid ratio range and optimization accuracy. If a hybrid ratio range is entered, the input hybrid ratio range is used as the hybrid ratio simulation optimization range and a series of target hybrid ratios are determined according to the optimization accuracy. If no hybrid ratio range is entered, the default hybrid range set by the system is used as the hybrid ratio simulation optimization range.

[0062] After the relevant data detection is completed, the simulation of the ship power system begins. Specifically, the system's required power, torque, speed and other parameters are determined according to the navigation conditions, and the working mode of the next time step in the simulation process is determined through the simulation operation strategy according to the above parameters. Simulation is performed at each time step according to the corresponding working mode and target channel data, and the first simulation result under the simulated hybrid ratio of each time step is obtained based on the engine MAP diagram and the motor MAP diagram, wherein the first simulation result may include data on optimization targets such as emissions, fuel consumption, efficiency, and power consumption.

[0063] After obtaining the first simulation results under multiple simulated hybrid ratios, it is determined that each target hybrid ratio in the hybrid ratio set can match at least one of the multiple simulated hybrid ratios, that is, it is determined that each target hybrid ratio is simulated and calculated, and the first simulation result corresponding to the simulated hybrid ratio matching the target hybrid ratio is used as the second simulation result of the target hybrid ratio. Then, the fitness under multiple target hybrid ratios is determined according to the multiple second simulation results and the optimization target weights, and the simulation operation strategy is optimized based on the fitness of the multiple target hybrid ratios. The optimized simulation operation strategy takes into account the capacity of the energy storage system and the operation strategy of the energy storage system. For example, the operation strategy of the energy storage system can enter the power generation mode when SOC<20% and no motor propulsion is performed; when SOC>80%, no charging mode is performed. Then, based on the specified target hybrid ratio, the energy storage system capacity is used as the optimization variable to simulate again to obtain the third simulation results under multiple energy storage system capacities, and the fitness under multiple energy storage system capacities is determined according to the multiple third simulation results and the optimization target weights. Finally, the selection result is determined based on the fitness under different target hybrid ratios and the fitness under different energy storage system capacities.

[0064] In this embodiment, the first simulation result obtained during the simulation process is a preliminary screening of the hybrid ratio, which can accelerate the discovery of the optimal hybrid ratio. A better hybrid ratio can be obtained by matching the first simulation result to obtain the second simulation result. The third simulation result is a simulation result obtained in combination with the capacity of the energy storage system under the premise that the hybrid ratio is selected well, which can enable the selection result to include the capacity of the energy storage system as a reference.

[0065] Likewise, the third simulation result may include data of optimization targets such as emissions, fuel consumption, efficiency, and power consumption.

[0066] According to some specific embodiments of the present invention, the hybrid ratio set is obtained by the following steps:

[0067] Step S210, obtaining a preset hybrid ratio range and hybrid ratio optimization accuracy;

[0068] Step S220 , taking values ​​in the hybrid ratio interval according to the hybrid ratio optimization accuracy to obtain a plurality of target hybrid ratios.

[0069] Exemplarily, the hybrid ratio interval input by the user is [0.1, 0.3], and the optimization accuracy is 0.05, then the hybrid ratio set is {0.10, 0.15, 0.20, 0.25, 0.30}.

[0070] According to some specific embodiments of the present invention, the simulation operation strategy includes:

[0071] When the engine thermal efficiency is lower than the preset thermal efficiency value and the system power demand is less than the preset power value, the pure electric propulsion mode is adopted;

[0072] When the engine thermal efficiency is lower than the preset thermal efficiency value and the system power demand is greater than the preset power value, the hybrid propulsion mode is adopted;

[0073] When the engine thermal efficiency is greater than the preset thermal efficiency value, the engine propulsion mode is adopted.

[0074] According to some specific embodiments of the present invention, step S120 includes but is not limited to the following steps:

[0075] Step S310, determining the system required power of the current time step according to the navigation conditions;

[0076] Step S320, determining the working mode of the current time step of the ship power system through a simulation operation strategy according to the system demand power;

[0077] Step S330, simulating the ship power system according to the working mode, the engine MAP diagram and the motor MAP diagram to obtain first simulation results under multiple simulated hybrid ratios.

[0078] In this embodiment, the system required power, torque, speed and other parameters are determined according to the navigation conditions, and the working mode of the next time step in the simulation process is determined through the simulation operation strategy according to the above parameters. Simulation is performed at each time step according to the corresponding working mode and target channel data, and the first simulation result under the simulated hybrid ratio of each time step is obtained based on the engine MAP diagram and the motor MAP diagram, wherein the first simulation result includes data on optimization targets such as emissions, fuel consumption, efficiency, and power consumption.

[0079] According to some specific embodiments of the present invention, step S330 includes but is not limited to the following steps:

[0080] Step S410, when the working mode is the pure electric propulsion mode, the best motor efficiency that meets the current system power requirement is determined according to the motor MAP diagram, and the current time step is simulated according to the motor working condition corresponding to the best motor efficiency;

[0081] Step S420, when the working mode is the engine propulsion mode, determining whether the previous time step is the engine propulsion mode;

[0082] When the previous time step is not the engine propulsion mode, the engine speed is set to idle and the engine power with the best current engine thermal efficiency is determined according to the motor MAP diagram. The part of the engine power that cannot meet the system demand power is supplemented by the motor power until the engine power meets the system demand power to simulate the current time step;

[0083] When the previous time step is the engine propulsion mode, the first speed variable interval in the previous time step is determined, and the engine power with the best engine thermal efficiency in the first speed variable interval is determined. The part of the engine power that cannot meet the system demand power is supplemented by the motor power until the engine power meets the system demand power to perform the simulation of the current time step;

[0084] Step S430, when the working mode is the hybrid mode, determine the current second variable speed range of the engine, determine the engine power with the best engine thermal efficiency in the second variable speed range, and the part of the engine power that cannot meet the system demand power is supplemented by the motor power to perform simulation of the current time step.

[0085] In this embodiment, the initial engine speed and motor speed can be set to 0, the output power can be set to 0, the system power demand for the next time step can be determined according to the navigation conditions, and then the current working mode of the ship power system can be determined by the simulation operation strategy. When the working mode is pure electric propulsion, the motor working condition with the best current motor efficiency that meets the power demand is automatically searched as the system working condition for simulation, wherein the motor working condition can default to infinite motor acceleration, and the user can set the motor acceleration range for restriction. When it is the engine propulsion mode, if the previous time step is not the engine propulsion mode, the engine speed is automatically set to idle speed, and the engine power at the best engine thermal efficiency at this time is calculated. The part that is insufficient to the system power demand is made up by the motor. If the previous step is the engine propulsion mode, it is established in the first speed change interval of the previous time step, and the engine power at the best engine thermal efficiency in the first speed interval is calculated. The part that is insufficient to the system power demand is made up by the motor until the engine can meet the system power demand of propulsion alone. If it is a hybrid power mode, the engine power of the engine with the best engine thermal efficiency in the current second speed variable range is first calculated, and the part that is insufficient to the system power demand is made up by the motor. The above contents are looped in each time step to complete the simulation process.

[0086] According to some specific embodiments of the present invention, step S140 includes but is not limited to the following steps:

[0087] Step S510, normalizing multiple optimization target weights;

[0088] Step S520, determining a fitness function according to the normalized weights of the multiple optimization objectives;

[0089] Step S530, determining fitness under multiple target hybrid ratios according to the fitness function and multiple second simulation results.

[0090] In this embodiment, multiple optimization target weights are normalized so that the sum of all optimization target weights is 1, and then a fitness function is constructed based on the normalized multiple optimization target weights. The numerical value of the optimization target in the second simulation result is substituted into the fitness function to obtain the fitness of the corresponding target hybrid ratio, thereby obtaining the fitness under different target hybrid ratios.

[0091] According to some specific embodiments of the present invention, step S180 includes but is not limited to the following steps:

[0092] Step S610, selecting the target hybrid ratio and energy storage system capacity with a fitness greater than a preset fitness as the selection result.

[0093] In this embodiment, the hybrid ratio, energy storage system capacity, and system installed power when the fitness is maximum can be output as the preliminary selection result.

[0094] According to some embodiments of the present invention, the method for selecting a ship power system in an embodiment of the present invention further includes the following steps:

[0095] Step S710, determining emission curves, energy consumption curves and economy curves under different fitness levels according to a plurality of second simulation results;

[0096] Step S720, correcting the selection result according to the emission curve, energy consumption curve and economy curve.

[0097] In this embodiment, the fitness under different target hybrid ratios can also be displayed, and the fitness of different energy storage system capacities under the specified target hybrid ratios, emission curves, energy consumption curves and economic curves under different fitness can be provided for user reference to obtain the user's correction value to correct the preliminary selection result.

[0098] In an embodiment of the present invention, the power ratio of the engine and the motor is optimized in combination with the power demand of the ship power system. The optimization process includes the system's total power optimization, hybrid ratio gradient optimization, and comprehensive energy consumption and emission evaluation of the motor and the engine under specified working conditions. Then, the fitness of each model is calculated based on the selected target hybrid ratio, and finally the system rated power, system hybrid ratio, system comprehensive energy consumption and emission, system electric power change and other data are obtained. Then, the energy storage system capacity change range is estimated, and the final energy storage system capacity is estimated through the relationship curve between the energy storage system capacity and fitness after simulation. At the same time, other relevant data are output to provide certain guidance for the selection of ship hybrid power systems.

[0099] Reference Figure 2 , Figure 2 Schematic diagram of a ship power system selection device provided by an embodiment of the present invention. The ship power system selection device of the embodiment of the present invention includes one or more control processors and a memory. Figure 2 A control processor and a memory are taken as an example.

[0100] The control processor and the memory can be connected via a bus or other means. Figure 2 The example of connecting through bus is taken in the following.

[0101] As a non-transitory computer-readable storage medium, the memory can be used to store non-transitory software programs and non-transitory computer executable programs. In addition, the memory may include a high-speed random access memory, and may also include a non-transitory memory, such as at least one disk storage device, a flash memory device, or other non-transitory solid-state storage device. In some embodiments, the memory may optionally include a memory remotely arranged relative to the control processor, and these remote memories may be connected to the ship power system selection device via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0102] Those skilled in the art will understand that Figure 2 The device structure shown in the figure does not constitute a limitation on the selected device of the ship power system, and may include more or less components than shown in the figure, or a combination of certain components, or a different arrangement of components.

[0103] The non-transient software program and instructions required to implement the ship power system selection method applied to the ship power system selection device in the above embodiment are stored in the memory. When executed by the controlled processor, the ship power system selection method applied to the ship power system selection device in the above embodiment is executed.

[0104] In addition, an embodiment of the present invention also provides a computer-readable storage medium, which stores computer-executable instructions, and the computer-executable instructions are executed by one or more control processors, so that the one or more control processors can execute the ship power system selection method in the above method embodiment.

[0105] It will be appreciated by those skilled in the art that all or some of the steps and systems in the disclosed method above may be implemented as software, firmware, hardware and appropriate combinations thereof. Some physical components or all physical components may be implemented as software executed by a processor, such as a central processing unit, a digital signal processor or a microprocessor, or may be implemented as hardware, or may be implemented as an integrated circuit, such as an application specific integrated circuit. Such software may be distributed on a computer-readable medium, which may include a computer storage medium (or a non-transitory medium) and a communication medium (or a temporary medium). As known to those skilled in the art, the term computer storage medium includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information (such as computer-readable instructions, data structures, program modules or other data). Computer storage media include, but are not limited to, RAM, ROM, EEPROM, flash memory or other memory technologies, CD-ROM, digital versatile disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tapes, disk storage or other magnetic storage devices, or any other medium that may be used to store desired information and may be accessed by a computer. Furthermore, it is well known to those skilled in the art that communication media typically embodies computer readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave or other transport mechanism, and may include any information delivery media.

[0106] 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 above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. A method for selecting a ship power system, characterized in that: The following steps are involved: Acquire an engine MAP diagram, a motor MAP diagram, a simulation operation strategy, a hybrid ratio set, a navigation condition, and an optimization target weight, wherein the hybrid ratio set includes a target hybrid ratio, and the simulation operation strategy is used to characterize a mapping relationship between a power demand of a ship and an operating mode of a power system; According to the navigation condition, the simulation operation strategy, the engine MAP diagram and the motor MAP diagram, the ship power system is simulated to obtain first simulation results under multiple simulated hybrid ratios; Determining that the target hybrid ratios in the hybrid ratio set all match at least one of the simulated hybrid ratios obtained after simulation, and determining a second simulation result of the target hybrid ratio; Determine the fitness under the target hybrid ratios according to the second simulation results and the optimization target weights; Optimizing the simulation operation strategy based on the fitness of the plurality of target hybrid ratios; Based on the specified target hybrid ratio, simulating the ship power system according to the navigation condition, the simulation operation strategy, the engine MAP diagram and the motor MAP diagram to obtain third simulation results under multiple energy storage system capacities; Determine the fitness under the multiple energy storage system capacities according to the multiple third simulation results and the optimization target weights; The selection result is determined based on the fitness under the multiple target hybrid ratios and the fitness under the multiple energy storage system capacities.

2. The method for selecting a ship power system according to claim 1, characterized in that: The hybrid ratio set is obtained by the following steps: Obtaining a preset hybrid ratio range and hybrid ratio optimization accuracy; A plurality of target hybrid ratios are obtained by taking values ​​in the hybrid ratio interval according to the hybrid ratio optimization accuracy.

3. The method for selecting a ship power system according to claim 1, characterized in that: The simulation operation strategy includes: When the engine thermal efficiency is lower than the preset thermal efficiency value and the system power demand is less than the preset power value, the pure electric propulsion mode is adopted; When the engine thermal efficiency is lower than the preset thermal efficiency value and the system power demand is greater than the preset power value, the hybrid propulsion mode is adopted; When the engine thermal efficiency is greater than the preset thermal efficiency value, the engine propulsion mode is adopted.

4. The method for selecting a ship power system according to claim 3, characterized in that: The simulating the ship power system according to the navigation condition, the simulation operation strategy, the engine MAP diagram and the motor MAP diagram to obtain the first simulation results under multiple simulated hybrid ratios comprises the following steps: Determine the system required power at the current time step according to the navigation condition; Determining the working mode of the current time step of the ship power system through the simulation operation strategy according to the system demand power; The ship power system is simulated according to the working mode, the engine MAP diagram and the motor MAP diagram to obtain first simulation results under multiple simulated hybrid ratios.

5. The method for selecting a ship power system according to claim 4, characterized in that: The simulating the ship power system according to the working mode, the engine MAP map and the motor MAP map to obtain the first simulation results under multiple simulated hybrid ratios comprises the following steps: When the working mode is the pure electric propulsion mode, the best motor efficiency that meets the current system power requirement is determined according to the motor MAP diagram, and the current time step is simulated according to the motor working condition corresponding to the best motor efficiency; When the working mode is the engine propulsion mode, determine whether the previous time step is the engine propulsion mode; when the previous time step is not the engine propulsion mode, set the engine speed to idle speed and determine the engine power with the current best engine thermal efficiency according to the motor MAP diagram, and the part of the engine power that cannot meet the system power requirement is supplemented by the motor power until the engine power meets the system power requirement for the current time step simulation; when the previous time step is the engine propulsion mode, determine the first speed variable interval in the previous time step, and determine the engine power with the best engine thermal efficiency in the first speed variable interval, and the part of the engine power that cannot meet the system power requirement is supplemented by the motor power until the engine power meets the system power requirement for the current time step simulation; When the working mode is the hybrid mode, the current second variable speed range of the engine is determined, and the engine power with the best engine thermal efficiency in the second variable speed range is determined. The part of the engine power that cannot meet the system demand power is supplemented by the motor power to perform simulation of the current time step.

6. The method for selecting a ship power system according to claim 1, characterized in that: Determining the fitness under the target hybrid ratios according to the second simulation results and the optimization target weights comprises the following steps: Normalizing the weights of the plurality of optimization targets; Determine a fitness function according to the normalized weights of the plurality of optimization objectives; The fitness under the multiple target hybrid ratios is determined according to the fitness function and the multiple second simulation results.

7. The method for selecting a ship power system according to claim 1, characterized in that: Determining the selection result based on the fitness under the multiple target hybrid ratios and the fitness under the multiple energy storage system capacities comprises the following steps: The target hybrid ratio and energy storage system capacity with a fitness greater than a preset fitness are selected as the selection result.

8. The method for selecting a ship power system according to claim 7, characterized in that: The ship power system selection method further comprises the following steps: Determine emission curves, energy consumption curves and economy curves under different fitness levels according to the plurality of second simulation results; The selection result is corrected according to the emission curve, the energy consumption curve and the economy curve.

9. A method and device for selecting a ship power system, characterized in that: include: at least one processor; at least one memory for storing at least one program; When the at least one program is executed by the at least one processor, the at least one processor implements the ship power system selection method as described in any one of claims 1 to 8.

10. A computer-readable storage medium storing a program executable by a processor, characterized in that: The program executable by the processor is used to implement the ship power system selection method according to any one of claims 1 to 8 when executed by the processor.

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