CN115358057A - Digital twin design method and system of relay protection device - Google Patents
Digital twin design method and system of relay protection device Download PDFInfo
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- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00001—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by the display of information or by user interaction, e.g. supervisory control and data acquisition systems [SCADA] or graphical user interfaces [GUI]
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00006—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
- H02J13/00016—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment using a wired telecommunication network or a data transmission bus
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- H—ELECTRICITY
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- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00006—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
- H02J13/00028—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment involving the use of Internet protocols
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00032—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for
- H02J13/00036—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for the elements or equipment being or involving switches, relays or circuit breakers
- H02J13/0004—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for the elements or equipment being or involving switches, relays or circuit breakers involved in a protection system
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2111/00—Details relating to CAD techniques
- G06F2111/10—Numerical modelling
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The invention discloses a digital twin design method and a system of a relay protection device, wherein a digital twin model of the relay protection device is designed based on the entity structure and function of the relay protection device; and (3) simulating and predicting the product performance of the relay protection device in different application scenes by using a digital twin model of the relay protection device in a design stage, and optimizing the digital twin model of the relay protection device according to a simulation prediction result. According to the invention, the quality and manufacturability of the design scheme can be evaluated without manufacturing a relay protection entity device, and the research and development cost and the product research and development cycle of the relay protection device can be reduced.
Description
Technical Field
The invention belongs to the technical field of relay protection of power systems, and relates to a digital twin design method and a digital twin design system of a relay protection device.
Background
In the conventional mode, after the product design is completed, the physical devices or main parts must be manufactured before the quality and manufacturability of the design solution can be evaluated. Developers often need a large number of prototypes to test new device functionality and performance availability, and the fabrication of prototypes also needs to be continually updated due to iterations of functionality. The iterative machining of the prototype not only leads to the increase of the cost, but also lengthens the research and development period of the product. And by establishing the digital twin model, before the equipment is actually manufactured, the quality of a finished product of the equipment can be predicted through the digital model and simulation, and whether the equipment has design defects, such as equipment functions, performances, parts, design conformity with specifications and the like, is judged. And finding out the reason for generating the design defects through an analysis tool, directly modifying the corresponding design in the digital twin model, and then carrying out function and performance prediction again until the problem is solved.
By using the digital twin model, the product performance can be predicted in the design stage, the product can be improved and optimized according to the prediction result, the detailed information can be known in the initial stage of the manufacturing process, and the prediction is further developed to ensure that all details have no errors. This is of great significance because the earlier it is known how to make excellent products, the faster it is possible to launch premium products to the market, preempting the lead.
The digital twin is a mirror image copy of a relay protection device real object, and integrates data of the relay protection device in the full life cycle of production, manufacturing, engineering debugging, operation and service, as well as models and other information, so as to optimize the actual performance of the real object asset equipment in the full life cycle of production and operation. When the digital twin support users do not have hardware, the respective pertinence test work of different users is completed by accessing the digital twin equipment and the virtual transformer substation at the cloud. The application of digital twins in the field of relay protection devices is still in the germination stage.
Disclosure of Invention
In order to solve the defects in the prior art, the invention aims to provide a digital twin design method and a system of a relay protection device.
In order to achieve the above purpose, the invention adopts the following technical scheme:
a digital twin design method of a relay protection device is characterized in that a digital twin model of the relay protection device is designed based on the entity structure and the function of the relay protection device;
and (3) simulating and predicting the product performance of the relay protection device in different application scenes by using a digital twin model of the relay protection device in a design stage, and optimizing the digital twin model of the relay protection device according to a simulation prediction result.
The invention further comprises the following preferred embodiments:
preferably, the relay protection device digital twin model comprises a hardware virtual layer, a data forming layer, a simulation analysis layer, an expression layer and an interaction layer;
the hardware virtual layer is used for digitally describing the entity board card according to the parameters and attributes of the entity board card of the relay protection device to form a corresponding virtual board card digital model;
the data formation layer is used for forming standardized secondary power data and electric data of the relay protection device according to the relationship between hardware and functional data, and realizing data modeling and management of the relay protection device;
the simulation analysis layer is used for downloading the latest protection logic software according to the entity function description of the relay protection device, receiving the data of the data formation layer, performing simulation prediction, and updating and iterating the protection logic according to simulation prediction information;
the presentation layer is used for displaying the result of the simulation analysis;
and the interaction layer is used for man-machine interaction, and realizes the improvement of the hardware virtual layer virtual board card and the updating and iterative growth of the protection logic of the simulation analysis layer through an interaction instruction.
Preferably, the hardware virtual layer constructs a virtual board card that implements the following functional modules: the system comprises a power supply module, a communication and management module, an alternating current converter, an analog-to-digital converter, a CPU protection module, an SV module, a GOOSE module, an input module, an output module and a bus simulator, wherein the power supply module is connected with the communication and management module;
the power supply module is used for supplying power to the communication and management module, the protection CPU module, the SV module, the GOOSE module, the input module and the output module;
the communication and management module is internally provided with a MASTER plug-in unit, is connected with the human-computer interface, is used for converting a communication model and a protocol, realizes data communication and management, and realizes liquid crystal display and interface keyboard operation based on the human-computer interface;
the alternating current converter is used for converting alternating current and alternating voltage introduced into the relay protection device into digital quantity corresponding to the alternating current quantity through the analog-to-digital converter and inputting the digital quantity into the protection CPU module;
the opening module is used for receiving the hard pressing plate and other external opening signals and transmitting the received signals to the protection CPU module;
the protection CPU module is used for judging protection logic by adopting protection logic software which is downloaded in advance according to the input volume and the traffic volume, and sending a management instruction to the input module according to a trip range which is preset for protection after the protection logic software judges that the power grid fault occurs;
the switching-off module is used for receiving a management instruction for protecting the CPU module and sending a tripping and closing signal;
the SV module and the GOOSE module are respectively used for digital receiving and processing of the traffic flow and digital receiving and transmitting of the input quantity and the output quantity;
and the bus simulator is used for managing the bus data of the hardware virtual card and simulating the priority, the real-time performance and the data exchange capacity of each bus.
Preferably, the bus comprises an ethernet bus, a PCIe bus and a CAN bus, and is used for realizing information interaction among the communication and management module, the processor module, the SV module, the GOOSE module, the import module and the export module;
the tripping and closing signals comprise tripping opening and signal opening;
wherein, tripping is opened for protecting tripping and removing faults;
the signal is sent out for alarming and starting the fault recording of the transformer substation;
the protection comprises bus protection, line protection, transformer protection and reactor protection.
Preferably, the virtual boards are independent intelligent simulators respectively, correspond to the entity boards one to one, and can download and operate software versions of the corresponding entity boards respectively, a digital twin model of the relay protection device formed by the virtual boards is finally a one-to-one digital description of the entity device, all functions of the entity device are covered by the digital twin model of the relay protection device, and updating iteration of the functions can be realized by downloading software upgrading of different boards.
Preferably, in the simulation analysis layer, if the action behavior of the simulated protection logic conforms to the functional description expectation, the protection logic software finalizes and releases the application;
and if the data simulation result is not as expected, the design of the virtual board card software, the protection logic software and the data model is carried out again, after the design is finished, the protection logic software with the latest version is downloaded again, and the simulation and the judgment are carried out again until the action behavior of the simulated protection logic accords with the expected behavior.
Preferably, the result of the simulation analysis layer is analyzed and judged through an expert system or an automatic diagnosis system, if the simulation result has uncertainty or incompleteness or the relay protection device digital twin model needs upgrading improvement, the interaction layer feeds back an interaction instruction to the hardware virtual layer to perform virtual board improvement or addition and deletion, and the interaction instruction is acted on the updating and iterative growth of the protection logic of the simulation analysis layer until the performance test requirement of the relay protection device digital twin model is met.
Preferably, the simulation prediction of the product performance of the relay protection device in different application scenarios by using the digital twin model of the relay protection device in the design stage and the optimization of the digital twin model of the relay protection device according to the simulation prediction result specifically include:
and (3) using a digital twin model of the relay protection device, performing performance test and performance parameter recording under the normal operation state, the alarm state and the fault state of the power system in the design stage, and improving the protection principle, algorithm, logic, interface or relay performance of the digital twin model of the relay protection device according to the recorded performance parameter difference.
Preferably, the relay protection performance is predicted by adopting a data playback, static test or dynamic test mode;
the data playback means that the performance of the relay protection in a specific state is tested by adopting fault recording data of field accidents of the power system;
the static test is to input stable voltage, current and frequency data by a test instrument to test the precision and the action stability of the relay protection;
the dynamic test refers to that the performance of the relay protection device in different states is tested by simulating an actual state by using a physically built model.
The invention also provides a digital twin design system of the relay protection device, which comprises a design module and a simulation and optimization module;
the design module is used for designing a digital twin model of the relay protection device based on the entity structure and the function of the relay protection device;
the simulation and optimization module is used for simulating and predicting the product performance of the relay protection device in different application scenes by using the digital twin model of the relay protection device in a design stage and optimizing the digital twin model of the relay protection device according to a simulation prediction result.
Compared with the prior art, the invention has the beneficial effects that:
based on the entity structure and function of the existing relay protection device, a digital twin model of the relay protection device is designed according to a general digital twin framework, product research personnel can predict product performance in a design stage by using the digital twin model of the relay protection device, can improve and optimize according to a prediction result, further develop and predict, ensure that all details are error-free, can promote a high-quality product to the market as soon as possible, can evaluate the quality and manufacturability of a design scheme without manufacturing a relay protection entity device, and iteration of functions is completed in digital twin equipment, so that the research and development cost and the product research and development period of the relay protection device are greatly reduced. And the method can support a user to finish the pertinence test work of different application scenes by accessing the digital twin model of the cloud when the user does not have hardware, and reduce the later-stage user maintenance and installation cost.
Drawings
FIG. 1 is a diagram of a digital twin model architecture of a relay protection device according to an embodiment of the present invention;
fig. 2 is a virtual board contact diagram in the embodiment of the present invention.
Detailed Description
The invention is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
As shown in fig. 1, example 1 of the present invention provides a digital twin design method for a relay protection device, and in a preferred but non-limiting embodiment of the present invention, the method includes:
designing a digital twin model of the relay protection device based on the entity structure and the function of the relay protection device;
and (3) simulating and predicting the product performance of the relay protection device in different application scenes by using a digital twin model of the relay protection device in a design stage, and optimizing the digital twin model of the relay protection device according to a simulation prediction result.
Further preferably, as shown in fig. 1, the relay protection device digital twin model includes a hardware virtual layer, a data forming layer, a simulation analysis layer, an expression layer and an interaction layer;
the hardware virtual layer is used for digitally describing the entity board card according to parameters and attributes of the entity board card of the relay protection device to form a corresponding virtual board card digital model;
for example, the attributes of the incoming card include: board geometry and size, number of open circuits, open voltages (220V, 110V, 24V), input power, input latency, terminal wiring, communication bus, CPU performance (main frequency, interrupt, power), terminal configuration, etc.
The attributes of the alternating current conversion board card comprise: indexes and boundary conditions such as rated voltage, rated current, overcurrent multiple, voltage quantity, current quantity and the like;
the CPU board card is protected to include geometric figure size and CPU performance description (dominant frequency, computing power and digit)
Etc.;
the attributes of the outgoing board card comprise constraint conditions such as relay action voltage, outgoing quantity, signal holding and the like.
Each virtual board card corresponds to one simulator to simulate the performance of the virtual board card, and the functions are dispersed to the independent or shared CPU of the digital twin application server.
The bus communication and data information exchange management of each virtual board card are completed by an independent bus simulator.
As shown in fig. 2, the hardware virtual layer constructs a virtual board card that implements the following functional modules: the system comprises a power supply module, a communication and management module, a protection CPU module, an input module, an output module, an SV module, a GOOSE module, a human-computer interface and the like;
the power supply module is used for supplying power to the communication and management module, the protection CPU module, the SV module, the GOOSE module, the input module and the output module;
the communication and management module is internally provided with a MASTER plug-in unit, is connected with the human-computer interface, and is used for converting a communication model and a protocol, realizing data communication and management and realizing liquid crystal display and interface keyboard operation based on the human-computer interface;
and the bus simulator is used for managing the bus data of the hardware virtual card and simulating the priority, the real-time performance and the data exchange capacity of each bus.
The virtual board cards of the functional modules are connected with the bus board card (namely the bus simulator) through the chassis back board and the terminal connector. The communication and management module, the processor module, the input module, the output module and the like realize information interaction through buses, wherein the buses are general names of virtual board card contact buses, the actual buses CAN be buses such as Ethernet, PCIe, CAN and the like, and CAN also be complex bodies of various buses, some board cards are contacted through the Ethernet, some board cards are contacted through the CAN, and some board cards are contacted through the PCIe bus;
the alternating current converter is used for converting alternating current and alternating voltage introduced into the relay protection device into digital quantity corresponding to the alternating current quantity through the analog-to-digital converter and inputting the digital quantity into the protection CPU module;
the protection CPU module is used for finishing different protection logic judgment and tripping operation by adopting different protection logic software which is downloaded in advance according to the input volume and the alternating current volume, such as logic software for bus protection, line protection, transformer protection, reactor protection and the like;
bus protection: mainly comprises differential protection, bus-bar protection and breaker failure protection;
protecting the transformer: the method comprises the following protection steps of differential protection, impedance protection, over-excitation, composite voltage, overcurrent, zero-sequence current, overvoltage and the like;
line protection: the method comprises differential protection, distance protection, overcurrent protection, zero sequence protection and the like;
after the protection logic software judges that the power grid fault occurs according to protection logic calculation, the protection CPU module sends a management instruction to the switching-out module according to a trip range preset for protection, for example, the management instruction acts on a trip command of the switching-out board card to remove the corresponding power grid fault, acts on an alarm command of the signal board card to be used for alarm and display, and acts on a report starting command of the management board card to store the corresponding fault report and wave recording;
the opening module is used for receiving the hard pressing plate and an external opening signal and transmitting the received signal to the protection CPU module so as to realize functional control and logic judgment of protection function switching and quitting, failure starting, remote tripping and the like;
the switching-off module is used for receiving a management instruction for protecting the CPU module and sending a tripping and closing signal;
the tripping and closing signals comprise tripping opening and signal opening;
the trip is opened, is used for protecting the trip to remove faults and is opened passively;
the signal is output for alarming and starting the fault recording of the transformer substation;
the SV module is a digital receiving processing module of the traffic flow, and is communicated with the outside through an Ethernet communication interface, and the virtual terminal is associated with the MU. Relative to the input of an alternating current converter, the input of the alternating current converter is the physical quantity of alternating current and alternating voltage of a relay protection device introduced into a conventional transformer substation, and an SV module is the digital quantity of the alternating current and the alternating voltage of an intelligent transformer substation.
The GOOSE module is a digital transceiver module of the input quantity and the output quantity, and is related to external communication through an Ethernet communication interface, and a virtual terminal is related to other protection devices of an external terminal. The input of the switch-in module is a conventional transformer substation hard pressing plate and an external switch-in physical signal, the output of the switch-out module is a conventional transformer substation trip switch-out and signal switch-out physical node, and the GOOSE module is a switch-in and switch-out signal digital quantity of the intelligent transformer substation.
The virtual boards can be combined into different digital twin models of the relay protection device according to specific implementation targets, the number and the combination mode of the virtual boards of each specific digital twin device are not identical, bus protection, line protection, transformer protection, reactor protection and the like of common device types are provided, the virtual boards are provided with different numbers of virtual modules, and a power module, a communication and management module, an alternating current converter, an analog-to-digital converter, a protection CPU module, an SV module, a GOOSE module, an input module, an output module, a bus simulator and the like can be combined.
The virtual board cards are independent intelligent simulators respectively, correspond to the entity board cards one by one, and can respectively download and run software versions of the corresponding entity board cards, such as software input, software output, logic protection software and the like; the digital twin model of the relay protection device is finally one-to-one accurate digital description of the entity device, and the function realization covers the realization of all functions of the entity device, namely not only the digital simulation of a specific protection function such as distance protection and differential protection; the digital twin model of the relay protection device can realize the updating iteration of functions by downloading the software upgrading of different board cards.
The data formation layer is used for forming standardized secondary power data and electric data of the relay protection device according to the relation between hardware and functional data, and is structured memory data to realize data modeling and management of the relay protection device;
for example: the MASTER board card of the communication and management module receives an external clock signal and a time signal (B code, beidou or GPS), and synchronizes other virtual board cards through a time synchronization bus or pulses;
each virtual board card identifies a time tag for the alternating current sampling data and the input quantity acquisition data;
the MASTER board card transmits management operation commands such as switching-on and switching-off of the pressing plate, constant value switching and the like to each corresponding virtual board card, and the virtual board cards perform response operation according to the commands;
and forming standardized electric power secondary data and device electrical data from the process data according to the service relationship of the entity hardware, wherein data modeling is based on the description of a similar IEC61850 standard system protection function model, and corresponding instance data are added according to the protection logic function requirement.
The simulation analysis layer is used for downloading the latest protection logic software according to the entity function description of the relay protection device, receiving the data of the data formation layer, performing simulation prediction, and updating and iterating the protection logic according to simulation prediction information: if the action behavior of the simulated protection logic accords with the function description expectation, the protection logic software is shaped and releases the application;
and if the data simulation result is not as expected, the design of the virtual board card software, the protection logic software and the data model is carried out again, after the design is finished, the protection logic software with the latest version is downloaded again, and the simulation and the judgment are carried out again until the action behavior of the simulated protection logic accords with the expected behavior.
The presentation layer is used for showing the result of the simulation analysis, comprises protection logic, electrical connection and a 3D case and is shown to a user in an immersion manner; virtual display can also be realized: the simulation operation result is stored and played back to a user in a form of a digital twin model, and a simulation analysis result is displayed;
the interaction layer is used for man-machine interaction, and realizes the improvement of a hardware virtual layer virtual board card and the updating and iterative growth of the protection logic of the simulation analysis layer through an interaction instruction: and analyzing and judging the result of the simulation analysis layer through an expert system or an automatic diagnosis system, if the simulation result has uncertainty or incompleteness or the digital twin model of the relay protection device needs upgrading improvement, feeding an interaction instruction back to the hardware virtual layer by the interaction layer to improve or increase the virtual board card, and acting on the updating and iterative growth of the protection logic of the simulation analysis layer until the performance test requirement of the digital twin model of the relay protection device is met.
The method for simulating and predicting the product performance of the relay protection device in different application scenes in the design stage by using the digital twin model of the relay protection device and optimizing the digital twin model of the relay protection device according to the simulation prediction result comprises the following steps:
measuring and displaying information such as voltage, current, frequency, power, differential current, impedance and the like in a normal operation state of a power system at a design stage by using a digital twin model of a relay protection device, and performing operation and recording such as constant value setting, pressure plate switching, operation, printing and the like;
using a relay protection device digital twin model to display and report signals in an alarm state and send alarm information records in a design stage;
using a digital twin model of the relay protection device, and recording the action behavior, action time, action report, fault recording, fault parameters such as phase, impedance, current and voltage, and contact points such as a relay outlet and an action signal of the protection device in a fault state at a design stage;
and improving the protection principle, algorithm, logic, interface or relay performance of the digital twin model of the relay protection device according to the performance parameter difference.
In specific implementation, the application scenarios include normal, alarm, and fault states of the power system, which may also be described as transient, dynamic, and steady states, and may be generally expressed by voltage, frequency, and power. For example, the parameter expression in the normal operation state is:
ΔU ph <U set
Δf ph <f set
P in ＝P out
ΔU ph is the amount of change in voltage, Δ U ph ＝|U re -U n |，U re And U n The voltage measurement and the nominal value, respectively, have different voltage levels with respect to the voltage variation requirement, which typically does not deviate more than 10% from the nominal value.
Δf ph As the amount of change in frequency, Δ f ph ＝|f re -f n |，f re And f n The measured value and the rated value are respectively the frequency, and the 50Hz power grid in China generally can not be larger than 0.2Hz.
U set 、f set Thresholds are preset for voltage and frequency.
P in And P out The power of the power supply and the power of the load are respectively, the power of the power grid is balanced in a normal state, and the power angle meets the stability requirement.
The relay protection performance prediction method can adopt various methods such as data playback, static test, dynamic test and the like. The three methods of data playback, static test and dynamic test are respectively injected from different virtual boards of the hardware virtual layer according to the data attributes. The system comprises a virtual board card, a digital formation layer, an SV module, a GOOSE module, a common analog quantity acquisition module, a common open signal acquisition module, a digital sampling value acquisition module, a GOOSE module and a virtual board card, wherein the common analog quantity is injected from the AC acquisition module, the common open signal is injected from the open module, the digital sampling value is injected from the SV module, the digital open information is injected from the GOOSE module, and the virtual board cards are transmitted to the digital formation layer according to digital models and synchronous signals of the virtual board cards. The data forming layer forms structured memory data of electric power secondary data and electric data according to the relation between hardware and functional data; the simulation analysis layer receives the data of the data formation layer, carries out simulation prediction and transmits the generated outlet, message and the like to the presentation layer; the presentation layer displays the simulation analysis result to the user in the form of a digital twin model. The outgoing module displays a conventional trip outlet and signals, the GOOSE module displays digital outlet signals, and the liquid crystal MMI module displays message information.
The test data adopted by the data playback is fault recording data of field accidents of the power system and is used for testing the performance of the relay protection in a specific fault state; injecting fault recording data into the tripping time of a protection outlet, performing matching analysis on the fault recording data and the outlet of the fault recording data, and analyzing the protection performance in a specific fault state;
the static test utilizes a test instrument to input stable data such as voltage, current, frequency and the like, and analyzes the protection precision and the action stability through the relation between the size change of the input data and the outlet trip;
the dynamic test utilizes the built physical model to simulate the performance of the relay protection device under different running and fault conditions in an actual state test; according to dynamic environment data and simulation results generated in different running and fault states, and according to causal logic and time relation of action behavior of relay protection logic in theory, whether performance meets running requirements or not can be judged through methods such as manual comparison or an expert system, and protection performance under different running and fault states is analyzed.
The invention relates to a digital twin design system of a relay protection device, which comprises a design module and a simulation and optimization module;
the design module is used for designing a digital twin model of the relay protection device based on the entity structure and the function of the relay protection device;
the simulation and optimization module is used for simulating and predicting the product performance of the relay protection device in different application scenes by using the digital twin model of the relay protection device in the design stage and optimizing the digital twin model of the relay protection device according to the simulation prediction result.
Compared with the prior art, the invention has the beneficial effects that:
based on the realization of the entity structure and the function of the conventional relay protection device, a digital twin model of the relay protection device is designed according to a general architecture of the digital twin, and by using the digital twin model of the relay protection device, product developers can predict the product performance in the design stage, improve and optimize the product performance according to the prediction result, further develop the prediction, ensure that all details are error-free, can release high-quality products to the market as soon as possible, can evaluate the quality and the manufacturability of a design scheme without manufacturing a relay protection entity device, and complete the iteration of the function on digital twin equipment, thereby greatly reducing the research and development cost and the product research and development period of the relay protection device. And the method can support a user to complete the pertinence test work of different application scenes by accessing the 'digital twin device' of the cloud when no hardware is in the local, and reduce the later-stage user maintenance and installation cost.
The present applicant has described and illustrated embodiments of the present invention in detail with reference to the accompanying drawings, but it should be understood by those skilled in the art that the above embodiments are merely preferred embodiments of the present invention, and the detailed description is only for the purpose of helping the reader to better understand the spirit of the present invention, and not for limiting the scope of the present invention, and on the contrary, any improvement or modification made based on the spirit of the present invention should fall within the scope of the present invention.
Claims (10)
1. A digital twin design method of a relay protection device is characterized in that:
designing a digital twin model of the relay protection device based on the entity structure and the function of the relay protection device;
and (3) simulating and predicting the product performance of the relay protection device in different application scenes by using a digital twin model of the relay protection device in a design stage, and optimizing the digital twin model of the relay protection device according to a simulation prediction result.
2. The digital twin design method of a relay protection device according to claim 1, wherein:
the relay protection device digital twin model comprises a hardware virtual layer, a data forming layer, a simulation analysis layer, an expression layer and an interaction layer;
the hardware virtual layer is used for digitally describing the entity board card according to the parameters and attributes of the entity board card of the relay protection device to form a corresponding virtual board card digital model;
the data formation layer is used for forming standardized secondary power data and electric data of the relay protection device according to the relationship between hardware and functional data, and realizing data modeling and management of the relay protection device;
the simulation analysis layer is used for downloading the latest protection logic software according to the entity function description of the relay protection device, receiving the data of the data formation layer, performing simulation prediction, and updating and iterating the protection logic according to simulation prediction information;
the presentation layer is used for displaying the result of the simulation analysis;
and the interaction layer is used for man-machine interaction, and realizes the improvement of the hardware virtual layer virtual board card and the updating and iterative growth of the protection logic of the simulation analysis layer through an interaction instruction.
3. The digital twin design method of a relay protection device according to claim 2, wherein:
the hardware virtual layer constructs a virtual board card for realizing the following functional modules: the system comprises a power supply module, a communication and management module, an alternating current converter, an analog-to-digital converter, a protection CPU module, an SV module, a GOOSE module, an input module, an output module and a bus simulator, wherein the power supply module is used for supplying power to the communication and management module;
the power supply module is used for supplying power to the communication and management module, the protection CPU module, the SV module, the GOOSE module, the input module and the output module;
the communication and management module is internally provided with a MASTER plug-in unit, is connected with the human-computer interface, is used for converting a communication model and a protocol, realizes data communication and management, and realizes liquid crystal display and interface keyboard operation based on the human-computer interface;
the alternating current converter is used for converting alternating current and alternating voltage introduced into the relay protection device into digital quantity corresponding to the alternating current quantity through the analog-to-digital converter and inputting the digital quantity into the protection CPU module;
the opening module is used for receiving the hard pressing plate and other external opening signals and transmitting the received signals to the protection CPU module;
the protection CPU module is used for judging protection logic by adopting protection logic software which is downloaded in advance according to the input volume and the traffic volume, and sending a management instruction to the input module according to a trip range which is preset for protection after the protection logic software judges that the power grid fault occurs;
the switching-off module is used for receiving a management instruction for protecting the CPU module and sending a tripping and closing signal;
the SV module and the GOOSE module are respectively used for digital receiving and processing of the traffic flow and digital receiving and transmitting of the input quantity and the output quantity;
and the bus simulator is used for managing the bus data of the hardware virtual card and simulating the priority, the real-time performance and the data exchange capacity of each bus.
4. The digital twin design method of a relay protection device according to claim 3, wherein:
the bus comprises an Ethernet bus, a PCIe bus and a CAN bus and is used for realizing information interaction among a communication and management module, a processor module, an SV module, a GOOSE module, an input module and an output module;
the tripping and closing signals comprise tripping opening and signal opening;
wherein, tripping is opened for protecting tripping to remove fault;
the signal is sent out for alarming and starting the fault recording of the transformer substation;
the protection comprises bus protection, line protection, transformer protection and reactor protection.
5. The digital twin design method of a relay protection device according to claim 3, wherein:
the virtual board cards are independent intelligent simulators respectively, correspond to the entity board cards one by one, and can download and operate software versions of the corresponding entity board cards respectively, the digital twin model of the relay protection device formed by the virtual board cards is finally one-to-one digital description of the entity device, all functions of the entity device are covered by the digital twin model of the relay protection device, and updating iteration of the functions can be realized by downloading software upgrading of different board cards.
6. The digital twin design method of a relay protection device according to claim 2, wherein:
in the simulation analysis layer, if the action behavior of the simulated protection logic accords with the function description expectation, the protection logic software is shaped and released to apply;
and if the data simulation result is not as expected, the design of the virtual board card software, the protection logic software and the data model is carried out again, after the design is finished, the protection logic software with the latest version is downloaded again, and the simulation and the judgment are carried out again until the action behavior of the simulated protection logic accords with the expected behavior.
7. The digital twin design method of a relay protection device according to claim 2, wherein:
and analyzing and judging the result of the simulation analysis layer through an expert system or an automatic diagnosis system, and if the simulation result has uncertainty or incompleteness or the digital twin model of the relay protection device needs upgrading improvement, feeding back an interactive instruction to the hardware virtual layer by the interaction layer to perform virtual board improvement or addition and deletion, and acting on the updating and iterative growth of the protection logic of the simulation analysis layer until the performance test requirement of the digital twin model of the relay protection device is met.
8. The digital twin design method of a relay protection device according to claim 1, wherein:
the method for simulating and predicting the product performance of the relay protection device in different application scenes by using the digital twin model of the relay protection device in the design stage and optimizing the digital twin model of the relay protection device according to the simulation prediction result specifically comprises the following steps:
and using a relay protection device digital twin model, performing performance test and performance parameter recording under the normal operation state, the alarm state and the fault state of the power system in the design stage, and improving the protection principle, algorithm, logic, interface or relay performance of the relay protection device digital twin model according to the recorded performance parameter difference.
9. The digital twin design method of a relay protection device according to claim 1, wherein:
the relay protection performance is predicted in a data playback, static test or dynamic test mode;
the data playback means that the performance of the relay protection in a specific state is tested by adopting fault recording data of field accidents of the power system;
the static test is to test the precision and the action stability of the relay protection by using the stable voltage, current and frequency data input by a test instrument;
the dynamic test refers to the performance of the relay protection device in different states tested by simulating the actual state by using a physically built model.
10. A digital twin design system of a relay protection device comprises a design module and a simulation and optimization module, and is characterized in that:
the design module is used for designing a digital twin model of the relay protection device based on the entity structure and the function of the relay protection device;
the simulation and optimization module is used for simulating and predicting the product performance of the relay protection device in different application scenes by using the digital twin model of the relay protection device in the design stage and optimizing the digital twin model of the relay protection device according to the simulation prediction result.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116306473A (en) * | 2023-02-06 | 2023-06-23 | 广州辰创科技发展有限公司 | PCBA dynamic function detection method and device based on digital twin behavior model modeling |
| CN117131828A (en) * | 2023-07-12 | 2023-11-28 | 合肥工业大学 | Digital twin identification method for passive parameters of boost converter |
| CN117294005A (en) * | 2023-09-13 | 2023-12-26 | 国网江苏省电力有限公司淮安供电分公司 | Protection operation mode defense early warning system and method for transformer substation line and transformer |
| CN117709286A (en) * | 2024-02-05 | 2024-03-15 | 北京交通大学 | Digital twinning-based railway signal relay circuit simulation system and simulation method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116306473A (en) * | 2023-02-06 | 2023-06-23 | 广州辰创科技发展有限公司 | PCBA dynamic function detection method and device based on digital twin behavior model modeling |
| CN116306473B (en) * | 2023-02-06 | 2024-04-26 | 广州辰创科技发展有限公司 | PCBA dynamic function detection method and device |
| CN117131828A (en) * | 2023-07-12 | 2023-11-28 | 合肥工业大学 | Digital twin identification method for passive parameters of boost converter |
| CN117131828B (en) * | 2023-07-12 | 2024-05-03 | 合肥工业大学 | Digital twin identification method for passive parameters of boost converter |
| CN117294005A (en) * | 2023-09-13 | 2023-12-26 | 国网江苏省电力有限公司淮安供电分公司 | Protection operation mode defense early warning system and method for transformer substation line and transformer |
| CN117709286A (en) * | 2024-02-05 | 2024-03-15 | 北京交通大学 | Digital twinning-based railway signal relay circuit simulation system and simulation method |
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