Digital twin system of cold region new energy ship power system

Abstract

The invention discloses a digital twinning system of a new energy ship power system in a cold region, relates to a new energy ship power system and a digital twinning technology, and aims to solve the problems that in the prior art, only different working conditions of a ship steam power system can be simulated respectively, the whole system cannot be monitored in real time, and fault prediction cannot be achieved. The cold region new energy ship power system comprises a power battery and a multi-source sensor, and in a digital twinning system, a multi-physical field coupling model takes the output of the multi-source sensor as the input and simulates the physical field coupling condition of part of models in a virtual digital model; the energy optimization module gives a power battery control signal according to the output of the multi-physics field coupling model, and controls the working state of the power battery through the remote control module; the fault prediction module performs fault prediction according to the output of the multi-physics field coupling model; and the man-machine interaction module realizes man-machine interaction between the user and the digital twin system.

Description

Technical Field

[0001] The present invention relates to new energy ship power systems and digital twin technologies. Background Art

[0002] A marine steam power system consists of individual units, thermal systems, control systems, and process systems. To ensure balanced operation and improve performance, understanding the system's operating status is crucial. However, existing technologies can only simulate different operating conditions separately, failing to monitor the entire system in real time or predict faults. Summary of the Invention

[0003] The purpose of the present invention is to solve the problem that the existing technology can only simulate different working conditions of the ship steam power system separately, but cannot monitor the entire system in real time and cannot predict faults, and to provide a digital twin system of the cold-region new energy ship power system.

[0004] The present invention provides a digital twin system of a cold-region new energy ship power system, wherein the cold-region new energy ship power system includes a power battery, the cold-region new energy ship power system is arranged with multi-source sensors, and the digital twin system includes a virtual digital model corresponding to the physical object of the cold-region new energy ship power system, a multi-physics field coupling model, an energy optimization module, a fault prediction module, a remote control module and a human-computer interaction module; the multi-physics field coupling model takes the output of the multi-source sensor as input to simulate the physical field coupling of some models in the virtual digital model; the energy optimization module gives a power battery control signal according to the output of the multi-physics field coupling model; the remote control module controls the working state of the power battery according to the power battery control signal; the fault prediction module performs fault prediction according to the output of the multi-physics field coupling model; and the human-computer interaction module is used to realize human-computer interaction between the user and the digital twin system.

[0005] Optionally, the multi-source sensor includes a vibration sensor, a temperature sensor, a pressure sensor and a flow sensor.

[0006] Optionally, the cold-region new energy ship power system includes a generator set, a first substation, a power battery, a second substation, an electric motor, a gearbox and a propeller; the first substation converts the AC power generated by the generator set into DC power, which is stored by the power battery; the second substation converts the DC power input from the shore power into AC power, which is output by the electric motor to the gearbox to drive the propeller.

[0007] Optionally, the multi-physics field coupling model is constructed based on Simulink.

[0008] Optionally, the multi-physics field coupling model includes an electrochemical model, a thermodynamic model, and a fluid mechanics model.

[0009] The present invention simulates the overall operation of the cold-region new energy ship power system by creating a digital twin system of the cold-region new energy ship power system, realizes real-time monitoring of the operation of the cold-region new energy ship power system, and performs fault prediction.

[0010] In addition, the present invention adds a power battery to the cold-region new energy ship power system, which can convert the residual steam energy into electrical energy and store it in the power battery, thereby improving energy utilization. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a schematic diagram of the principle of the cold-region new energy ship power system according to an embodiment of the present application;

[0012] Figure 2 It is a structural diagram of the digital twin system according to an embodiment of the present application. DETAILED DESCRIPTION

[0013] The following describes the embodiments of the present invention through specific examples. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments. The details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other unless they conflict.

[0014] As used herein, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context indicates otherwise. It should be further understood that the terms "comprise", "include" indicate the presence of the described features, operations, elements, components, items, kinds, and / or groups, but do not exclude the presence, occurrence, or addition of one or more other features, operations, elements, components, items, kinds, and / or groups. The terms "or" and "and / or" used herein are interpreted as inclusive, or mean any one or any combination. Thus, "A, B, or C" or "A, B, and / or C" means "any of the following: A; B; C; A and B; A and C; B and C; A, B, and C". Exceptions to this definition occur only when the combination of elements, functions, or operations is inherently mutually exclusive in some way.

[0015] In view of the problem that the existing technology can only simulate different operating conditions of the ship steam power system separately, but cannot monitor the entire system in real time and cannot predict faults, the present invention provides a digital twin system of the cold-region new energy ship power system, which can simulate the overall operation of the cold-region new energy ship power system, realize real-time monitoring of the operation of the cold-region new energy ship power system, and predict faults.

[0016] The steam power system of a ship converts thermal energy into mechanical energy. Due to the limited capacity of the heat storage tank and the lack of flexible energy storage media such as electrical energy / chemical energy, the surplus energy can only be temporarily stored in the form of hot water / steam, and the efficiency of heat reconversion is insufficient. The cold-region new energy ship power system of the embodiment of the present application adds a power battery to store the remaining energy. The power battery of the embodiment of the present application is implemented using a lithium battery. The lithium battery pack can complete 0-100% power switching in a very short time, and the response speed is greatly improved compared to the steam system. When the ship suddenly encounters high-load conditions such as icebreaking and storms, the battery can instantly compensate for the power to avoid surge shutdown of the main engine, while also reducing energy waste.

[0017] Figure 1 This is a schematic diagram of the principle of the cold-region new energy ship power system according to the embodiment of the present application. Figure 1 As shown, the power system's internal combustion engine is disconnected from the transmission mechanism. The methanol generator power source only powers the generator, while the propeller is powered entirely by the electric motor, with the battery pack also providing auxiliary power to the motor. In the power system, the engine only works on the generator, generating energy that can be used to charge the battery and also to supply the propeller drive motor. The specific distribution of the generator power is controlled by an energy management system. The principle is that when the ship's power demand is low, the power battery system absorbs excess energy. During battery-only operation, the generator set is shut down, and the electric motor is powered entirely by the battery. During normal driving and operating modes, the lithium battery pack can be used according to actual demand, shaving peak loads and reducing emissions, effectively addressing the engine efficiency degradation caused by sudden load changes during variable speed driving or variable operating conditions on conventional ships. Furthermore, the series hybrid system boasts a simple mechanical structure. The propeller is driven by an electric motor, and propeller speed regulation is achieved by simply controlling the drive motor speed, eliminating the need for complex clutches and gear transmission mechanisms. In addition, the series hybrid propulsion system uses pure electric motor drive, and the response time of motor speed regulation is shorter than that of traditional internal combustion main engine drive. Better dynamic speed regulation performance can make the ship more maneuverable and flexible during operation.

[0018] Multi-source sensors are deployed in various parts of the cold-region new energy ship power system, including vibration sensors, temperature sensors, pressure sensors, flow sensors, etc., so as to monitor each component in the system in real time and transmit the data to the database.

[0019] The digital twin system of the above-mentioned cold-region new energy ship power system needs to reconstruct the virtual digital model corresponding to the physical object of the real ship steam power system in the virtual space to realize real-time two-way interaction between the real ship space and the virtual space; the physical objects of the steam power system include single-machine equipment, thermal system, control system and process system, and the corresponding virtual digital models include virtual equipment model, virtual thermal system model, virtual control system model and virtual process system model.

[0020] This embodiment of the application uses Simulink to build a multi-physics field coupling model (electrochemical model, thermodynamic model, fluid dynamics model, etc.), and develops functional modules such as energy efficiency optimization, fault prediction, remote control, and human-computer interaction to form a digital twin system for the cold-region new energy ship power system. In addition, the digital twin system also includes a visualization page to realize human-computer interaction of the digital twin system, thereby realizing virtual control of the real.

[0021] like Figure 2 As shown, the digital twin system of the cold-region new energy ship power system of the embodiment of the present application includes a virtual digital model 1 corresponding to the physical object of the cold-region new energy ship power system, a multi-physical field coupling model 2 of the cold-region new energy ship power system, an energy optimization module 3, a remote control module 4, a fault prediction module 5 and a human-computer interaction module 6.

[0022] The multi-physics field coupling model 2 simulates the physical field coupling of some models in the virtual digital model 1. The multi-physics field coupling model 2 uses the output of the multi-source sensor as input to simulate the working state of the cold-region new energy ship power system.

[0023] The energy optimization module 3 provides a power battery control signal according to the output of the multi-physics field coupling model 2;

[0024] The remote control module 4 controls the working state of the power battery according to the power battery control signal;

[0025] The fault prediction module 5 performs fault prediction based on the output of the multi-physics field coupling model 2;

[0026] The human-computer interaction module 6 is used to realize human-computer interaction between the user and the digital twin system.

[0027] The digital twin system of the cold-region new energy ship power system above realizes intelligent management and control of virtual-real interaction by constructing a dynamic virtual mirror of the entire life cycle of the physical system. Its core is to use real-time data (temperature, vibration, emissions, etc.) from multiple sources of sensors as input, and rely on multi-physical field coupling models to dynamically simulate the operating conditions of the power system in extreme environments. It combines AI algorithms (such as reinforcement learning and LSTM prediction) to predict energy efficiency and optimize energy efficiency distribution, and has the function of peak shaving and valley filling. In addition, the digital twin system above can complete the process from prediction to optimization, predict the load based on different data from sensors, flexibly adjust the energy supply strategy when the load changes, reduce the number of main engine starts and stops, extend the system life, and predict faults and perform self-healing. Through the digital twin system of the cold-region new energy ship power system above, fuel efficiency can be improved, the sudden failure rate can be reduced, and the power system can be monitored in real time.

[0028] The various techniques described herein may be implemented in conjunction with hardware or software, or a combination thereof. Thus, the methods and apparatus of the present invention, or certain aspects or portions of the methods and apparatus of the present invention, may be implemented in the form of program codes (i.e., instructions) embedded in a tangible medium, such as a removable hard disk, a USB flash drive, a floppy disk, a CD-ROM, or any other machine-readable storage medium, wherein when the program is loaded into a machine such as a computer and executed by the machine, the machine becomes an apparatus for practicing the present invention.

Claims

1. A digital twin system for a cold-region new energy ship power system, characterized in that: The cold-region new energy ship power system includes a power battery, the cold-region new energy ship power system is equipped with multi-source sensors, and the digital twin system includes a virtual digital model corresponding to the physical object of the cold-region new energy ship power system, a multi-physics field coupling model, an energy optimization module, a fault prediction module, a remote control module, and a human-computer interaction module; The multi-physics field coupling model uses the output of the multi-source sensor as input to simulate the physical field coupling of some models in the virtual digital model; The energy optimization module provides a power battery control signal according to the output of the multi-physics field coupling model; The remote control module controls the working state of the power battery according to the power battery control signal; The fault prediction module performs fault prediction according to the output of the multi-physics field coupling model; The human-computer interaction module is used to realize human-computer interaction between the user and the digital twin system.

2. The digital twin system according to claim 1, characterized in that: The multi-source sensor includes a vibration sensor, a temperature sensor, a pressure sensor, and a flow sensor.

3. The digital twin system according to claim 1, wherein: The cold-region new energy ship power system includes a generator set, a first power conversion device, a power battery, a second power conversion device, an electric motor, a gearbox and a propeller; The first power conversion device converts the AC power generated by the generator set into DC power, which is then stored by the power battery; The second power conversion device converts the direct current input from the shore power into alternating current, which is then output by the electric motor to the gearbox to drive the propeller.

4. The digital twin system according to claim 1, wherein: The multi-physics field coupling model is constructed based on Simulink.

5. The digital twin system according to claim 1, wherein: The multi-physics field coupling model includes an electrochemical model, a thermodynamic model and a fluid mechanics model.

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