CN116306141A - Digital twin calculation model construction method and device of GIS equipment - Google Patents

Digital twin calculation model construction method and device of GIS equipment Download PDF

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CN116306141A
CN116306141A CN202310265268.7A CN202310265268A CN116306141A CN 116306141 A CN116306141 A CN 116306141A CN 202310265268 A CN202310265268 A CN 202310265268A CN 116306141 A CN116306141 A CN 116306141A
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gis
steady
finite element
temperature
calculation model
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孙帅
李兴旺
姚聪伟
邰彬
王流火
庞小峰
李端姣
李健俊
朱锐锋
蔡玲珑
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Guangdong Power Grid Co Ltd
Electric Power Research Institute of Guangdong Power Grid Co Ltd
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Guangdong Power Grid Co Ltd
Electric Power Research Institute of Guangdong Power Grid Co Ltd
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
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    • G06F30/20—Design optimisation, verification or simulation
    • G06F30/23—Design optimisation, verification or simulation using finite element methods [FEM] or finite difference methods [FDM]
    • 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]
    • 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
    • H02J13/00002—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 monitoring
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2113/00—Details relating to the application field
    • G06F2113/04—Power grid distribution networks
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
    • G06F2119/08—Thermal analysis or thermal optimisation

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Abstract

According to the method and the device for constructing the digital twin calculation model of the GIS equipment, disclosed by the invention, power frequency alternating current excitation is applied to the constructed GIS simplified three-dimensional model through finite element simulation software, and the GIS steady-state temperature field is calculated and solved based on GIS equipment loss, so that a GIS steady-state temperature finite element result is obtained; based on GIS equipment loss and GIS steady-state temperature finite element results, calculating and obtaining equivalent thermal resistance of GIS equipment, and based on the equivalent thermal resistance and the GIS steady-state temperature finite element results, solving a preset GIS shell-heating value fitting formula to generate a GIS shell temperature calculation model; verifying the GIS shell temperature calculation model, and if the verification is passed, taking the GIS shell temperature calculation model as a digital twin calculation model; compared with the prior art, the technical scheme of the invention can improve the calculation efficiency of the GIS equipment shell temperature.

Description

Digital twin calculation model construction method and device of GIS equipment
Technical Field
The invention relates to the technical field of power equipment state evaluation, in particular to a digital twin calculation model construction method and device of GIS equipment.
Background
The digital twin technology is used as a real and virtual hub, can map the whole spatial scale and the whole life cycle of a physical entity to the digital information world, and has wide application prospect in the power industry. With the proposal of the digital twin concept of the electric power equipment, constructing a digital twin model which is equivalent to the physical equipment and runs synchronously becomes a current research hot spot; the multi-physical-field simulation is used as a key technology for equipment performance analysis, global operation parameter distribution can be obtained through a field calculation model, and the global operation parameter distribution is applied to a driving digital Li Sheng model to realize equipment monitoring, but the digital twin technology has the advantages of real-time performance and has higher requirement on calculation speed.
At present, the research of solving the physical field calculation problem by means of the traditional numerical simulation method, such as a finite element method and a finite volume method is mature, but the traditional finite element model has high degree of freedom and needs to disperse a space domain and a time domain at the same time, so that the calculation amount is huge, the calculation time is as long as an hour, and the method is not suitable for a digital twin model.
The GIS equipment is used as an important gas insulation combined electrical appliance for power generation, transmission and transformation, and is one of key equipment in the construction of a high-voltage power grid; although the GIS equipment has the advantages of small occupied area, easy maintenance and repair, compact structure, high operation reliability and the like, the equipment is easy to cause frequent equipment faults due to the temperature rise problems such as local overheating and the like, and the GIS electric field is difficult to monitor directly on site, so that the problems of difficult comprehensive prediction and monitoring of heating loss of the GIS equipment, overlarge current density, large eddy current loss and the like are caused in the prior art, thereby causing hidden danger to the operation safety of a power plant and a transformer substation, and therefore, the method has great significance for the establishment of a rapid calculation model applied to the GIS equipment in digital twin and the requirement of realizing the real-time adjustment of the load in the digital twin.
Disclosure of Invention
The invention aims to solve the technical problems that: the digital twin calculation model construction method and device for the GIS equipment can improve the calculation efficiency of the shell temperature of the GIS equipment.
In order to solve the technical problems, the invention provides a digital twin calculation model construction method of GIS equipment, which comprises the following steps:
constructing a GIS three-dimensional model, and simplifying the GIS three-dimensional model to obtain a GIS simplified three-dimensional model;
applying power frequency alternating current excitation to the GIS simplified three-dimensional model based on finite element simulation software, calculating and solving a GIS steady-state temperature field based on GIS equipment loss under the power frequency alternating current excitation to obtain a GIS steady-state temperature finite element result;
calculating and obtaining equivalent thermal resistance of GIS equipment based on the GIS equipment loss and the GIS steady-state temperature finite element result, and solving a preset GIS shell-heating value fitting formula based on the equivalent thermal resistance and the GIS steady-state temperature finite element result to generate a GIS shell temperature calculation model;
and verifying the GIS shell temperature calculation model, if verification is passed, taking the GIS shell temperature calculation model as a digital twin calculation model, and if verification is failed, solving a preset GIS shell-heating value fitting formula based on the equivalent thermal resistance of the obtained GIS equipment and the GIS steady-state temperature finite element result, and generating a new GIS shell temperature calculation model until verification is passed.
In one possible implementation manner, a GIS three-dimensional model is constructed, and the GIS three-dimensional model is simplified to obtain a GIS simplified three-dimensional model, which specifically includes:
the method comprises the steps of obtaining prototype sizes of GIS equipment, and carrying out one-to-one modeling processing on the GIS equipment based on the prototype sizes to obtain a GIS three-dimensional model;
and acquiring and simplifying the structures of the conductors, the contact bases and the insulator inserts in the GIS three-dimensional model to obtain the GIS simplified three-dimensional model.
In one possible implementation manner, a power frequency ac current excitation is applied to the GIS simplified three-dimensional model, and a GIS device loss under the power frequency ac current excitation is calculated, which specifically includes:
selecting a plurality of currents at different moments, wherein the currents at different moments comprise a current at a maximum current value moment, a current at an average current value moment, a current at a median current value moment and a current at a minimum current value moment;
and based on each current, applying power frequency alternating current excitation to the GIS simplified three-dimensional model, and calculating the GIS equipment loss under each power frequency alternating current excitation.
In one possible implementation manner, based on the GIS equipment loss under the power frequency alternating current excitation, solving a GIS steady-state temperature field to obtain a GIS steady-state temperature finite element result, specifically comprising:
and obtaining GIS equipment loss under the excitation of each power frequency alternating current, solving a GIS steady-state temperature field by taking the GIS equipment loss as a heat source to obtain a GIS steady-state temperature finite element result corresponding to each GIS equipment loss, wherein the GIS steady-state temperature finite element result comprises a GIS shell temperature, a GIS inner conductor temperature and a GIS equipment working environment temperature.
In one possible implementation manner, based on the GIS device loss and the GIS steady-state temperature finite element result, calculating and obtaining an equivalent thermal resistance of the GIS device specifically includes:
substituting the loss of each GIS device and the GIS steady-state temperature finite element result corresponding to the loss of the GIS device into a preset equivalent thermal resistance calculation formula respectively, and calculating and obtaining the first equivalent thermal resistance of the GIS device under the loss of each GIS device;
and acquiring the first equivalent thermal resistance under the loss of all the GIS equipment, and calculating and taking the average value of all the first equivalent thermal resistances as the equivalent thermal resistance of the GIS equipment.
In one possible implementation manner, based on the equivalent thermal resistance and the GIS steady-state temperature finite element result, a preset GIS shell-heating value fitting formula is solved to generate a GIS shell temperature calculation model, which specifically includes:
calculating and obtaining the integral heating value of the GIS equipment based on the equivalent thermal resistance and the GIS steady-state temperature finite element result;
inputting the overall heating value of the GIS equipment and the GIS steady-state temperature finite element result into a preset GIS shell-heating value fitting formula, and carrying out parameter estimation on an unknown convection heat dissipation coefficient set in the GIS shell-heating value fitting formula based on a global optimization method to obtain a convection heat dissipation coefficient set;
substituting the convection heat dissipation coefficient group into the GIS shell-heating value fitting formula to obtain a GIS shell temperature calculation model.
In one possible implementation manner, verifying the GIS shell temperature calculation model specifically includes:
acquiring a GIS steady-state temperature finite element result corresponding to the GIS equipment loss, and extracting the GIS shell temperature from the GIS steady-state temperature finite element result;
taking the GIS equipment loss as the overall heating value of the GIS equipment, and inputting the GIS equipment loss into the GIS shell temperature calculation model to obtain a first GIS shell temperature;
and calculating a temperature error result between the GIS shell temperature and the first GIS shell temperature, if the temperature error result is smaller than a preset temperature error threshold value, determining that the verification of the GIS shell temperature calculation model passes, otherwise, determining that the verification of the GIS shell temperature calculation model fails.
The invention also provides a digital twin calculation model construction device of the GIS equipment, which comprises: the GIS equipment model building module, the finite element simulation solving module, the GIS shell temperature calculation model generating module and the GIS shell temperature calculation model verifying module;
the GIS equipment model construction module is used for constructing a GIS three-dimensional model and simplifying the GIS three-dimensional model to obtain a GIS simplified three-dimensional model;
the finite element simulation solving module is used for applying power frequency alternating current excitation to the GIS simplified three-dimensional model based on finite element simulation software, calculating and solving a GIS steady-state temperature field based on GIS equipment loss under the power frequency alternating current excitation to obtain a GIS steady-state temperature finite element result;
the GIS shell temperature calculation model generation module is used for calculating and obtaining equivalent thermal resistance of GIS equipment based on the GIS equipment loss and the GIS steady-state temperature finite element result, solving a preset GIS shell-heating value fitting formula based on the equivalent thermal resistance and the GIS steady-state temperature finite element result, and generating a GIS shell temperature calculation model;
the GIS shell temperature calculation model verification module is used for verifying the GIS shell temperature calculation model, if verification is passed, the GIS shell temperature calculation model is used as a digital twin calculation model, and if verification is failed, a preset GIS shell-heating value fitting formula is solved based on the obtained equivalent thermal resistance of the GIS equipment and the obtained GIS steady-state temperature finite element result, and a new GIS shell temperature calculation model is generated until verification is passed.
In one possible implementation manner, the GIS device model building module is configured to build a GIS three-dimensional model, simplify the GIS three-dimensional model, and obtain a GIS simplified three-dimensional model, and specifically includes:
the method comprises the steps of obtaining prototype sizes of GIS equipment, and carrying out one-to-one modeling processing on the GIS equipment based on the prototype sizes to obtain a GIS three-dimensional model;
and acquiring and simplifying the structures of the conductors, the contact bases and the insulator inserts in the GIS three-dimensional model to obtain the GIS simplified three-dimensional model.
In one possible implementation manner, the finite element simulation solving module is configured to apply power frequency ac current excitation to the GIS simplified three-dimensional model, and calculate GIS equipment loss under the power frequency ac current excitation, and specifically includes:
selecting a plurality of currents at different moments, wherein the currents at different moments comprise a current at a maximum current value moment, a current at an average current value moment, a current at a median current value moment and a current at a minimum current value moment;
and based on each current, applying power frequency alternating current excitation to the GIS simplified three-dimensional model, and calculating the GIS equipment loss under each power frequency alternating current excitation.
In one possible implementation manner, the finite element simulation solving module is configured to solve a GIS steady-state temperature field based on a GIS device loss under the excitation of the power frequency ac current, to obtain a GIS steady-state temperature finite element result, and specifically includes:
and obtaining GIS equipment loss under the excitation of each power frequency alternating current, solving a GIS steady-state temperature field by taking the GIS equipment loss as a heat source to obtain a GIS steady-state temperature finite element result corresponding to each GIS equipment loss, wherein the GIS steady-state temperature finite element result comprises a GIS shell temperature, a GIS inner conductor temperature and a GIS equipment working environment temperature.
In one possible implementation manner, the GIS shell temperature calculation model generating module is configured to calculate and obtain an equivalent thermal resistance of the GIS device based on the GIS device loss and the GIS steady-state temperature finite element result, and specifically includes:
substituting the loss of each GIS device and the GIS steady-state temperature finite element result corresponding to the loss of the GIS device into a preset equivalent thermal resistance calculation formula respectively, and calculating and obtaining the first equivalent thermal resistance of the GIS device under the loss of each GIS device;
and acquiring the first equivalent thermal resistance under the loss of all the GIS equipment, and calculating and taking the average value of all the first equivalent thermal resistances as the equivalent thermal resistance of the GIS equipment.
In one possible implementation manner, the GIS shell temperature calculation model generating module is configured to solve a preset GIS shell-heating value fitting formula based on the equivalent thermal resistance and the GIS steady-state temperature finite element result, to generate a GIS shell temperature calculation model, and specifically includes:
calculating and obtaining the integral heating value of the GIS equipment based on the equivalent thermal resistance and the GIS steady-state temperature finite element result;
inputting the overall heating value of the GIS equipment and the GIS steady-state temperature finite element result into a preset GIS shell-heating value fitting formula, and carrying out parameter estimation on an unknown convection heat dissipation coefficient set in the GIS shell-heating value fitting formula based on a global optimization method to obtain a convection heat dissipation coefficient set;
substituting the convection heat dissipation coefficient group into the GIS shell-heating value fitting formula to obtain a GIS shell temperature calculation model.
In one possible implementation manner, the module for verifying the GIS shell temperature calculation model is configured to verify the GIS shell temperature calculation model, and specifically includes:
acquiring a GIS steady-state temperature finite element result corresponding to the GIS equipment loss, and extracting the GIS shell temperature from the GIS steady-state temperature finite element result;
taking the GIS equipment loss as the overall heating value of the GIS equipment, and inputting the GIS equipment loss into the GIS shell temperature calculation model to obtain a first GIS shell temperature;
and calculating a temperature error result between the GIS shell temperature and the first GIS shell temperature, if the temperature error result is smaller than a preset temperature error threshold value, determining that the verification of the GIS shell temperature calculation model passes, otherwise, determining that the verification of the GIS shell temperature calculation model fails.
Compared with the prior art, the digital twin calculation model construction method and device for the GIS equipment have the following beneficial effects:
applying power frequency alternating current excitation to the constructed GIS simplified three-dimensional model through finite element simulation software, calculating and solving a GIS steady-state temperature field based on GIS equipment loss to obtain a GIS steady-state temperature finite element result; based on GIS equipment loss and GIS steady-state temperature finite element results, calculating and obtaining equivalent thermal resistance of GIS equipment, and based on the equivalent thermal resistance and the GIS steady-state temperature finite element results, solving a preset GIS shell-heating value fitting formula to generate a GIS shell temperature calculation model; verifying the GIS shell temperature calculation model, and if the verification is passed, taking the GIS shell temperature calculation model as a digital twin calculation model; compared with the prior art, the GIS shell temperature calculation model is used for calculating the GIS shell temperature based on the finite element simulation software, the GIS shell temperature calculation efficiency can be improved, the requirement of a digital twin model on the calculation speed can be met, and the GIS equipment load can be adjusted in real time based on the digital twin model.
Drawings
FIG. 1 is a schematic flow chart of an embodiment of a digital twin calculation model construction method for GIS equipment;
fig. 2 is a schematic structural diagram of an embodiment of a digital twin calculation model building device for a GIS device provided by the invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
Referring to fig. 1, fig. 1 is a schematic flow chart of an embodiment of a digital twin calculation model construction method of a GIS device provided by the present invention, as shown in fig. 1, the method includes steps 101 to 104, specifically as follows:
step 101: and constructing a GIS three-dimensional model, and simplifying the GIS three-dimensional model to obtain a GIS simplified three-dimensional model.
In one embodiment, prototype sizes of GIS equipment are obtained, and one-to-one modeling processing is performed on the GIS equipment based on the prototype sizes to obtain a GIS three-dimensional model.
Specifically, prototype sizes corresponding to key components such as a disconnecting switch and a bus in GIS equipment of a researched transformer substation are obtained, and one-to-one equivalent size modeling is carried out on the disconnecting switch and the bus based on the prototype sizes, so that a GIS three-dimensional model is obtained.
In an embodiment, the conductor, contact base and insulator insert structures in the GIS three-dimensional model are obtained and simplified, and a GIS simplified three-dimensional model is obtained.
Specifically, under the condition that the loss solving of GIS equipment is not affected, the components such as conductors, contact bases, insulator insert structures and the like in the GIS three-dimensional model are simplified, and the GIS simplified three-dimensional model is obtained.
Step 102: and applying power frequency alternating current excitation to the GIS simplified three-dimensional model based on finite element simulation software, calculating and solving a GIS steady-state temperature field based on GIS equipment loss under the power frequency alternating current excitation to obtain a GIS steady-state temperature finite element result.
In an embodiment, the GIS simplified three-dimensional model after modeling is imported into finite element simulation software, and parameters of components in the GIS simplified three-dimensional model are set based on the finite element simulation software, including setting corresponding materials, adding boundaries, setting frequencies and the like.
In an embodiment, a plurality of currents at different moments are selected from an actual operation current interval of the GIS device, where the currents at different moments include a current at a maximum current value moment, a current at an average current value moment, a current at a median current value moment, and a current at a minimum current value moment.
In one embodiment, based on each selected current, power frequency alternating current excitation is applied to the GIS simplified three-dimensional model, and GIS equipment loss under each power frequency alternating current excitation is calculated.
Specifically, based on the selected current, power frequency alternating current excitation is sequentially applied to conductor section powder in the GIS simplified three-dimensional model, and based on finite element simulation software, GIS equipment loss under the power frequency alternating current excitation is obtained until all the power frequency alternating current excitation corresponding to the selected current is applied to the GIS simplified three-dimensional model, and GIS equipment loss under different power frequency alternating current excitation is obtained.
In one embodiment, after the GIS equipment loss under each power frequency alternating current excitation is obtained, the GIS equipment loss is used as a heat source, and a GIS steady-state temperature field is solved to obtain a GIS steady-state temperature finite element result corresponding to each GIS equipment loss, wherein the GIS steady-state temperature finite element result comprises a GIS shell temperature, a GIS inner conductor temperature and a GIS equipment working environment temperature.
Specifically, the GIS equipment loss is used as a heat source, and the heat source is used as excitation loading of a GIS steady-state temperature field, so that a GIS steady-state temperature finite element result of the GIS steady-state temperature field under different heat sources is obtained.
Preferably, the operating environment temperature of the GIS equipment in the GIS steady-state temperature finite element result is a preset value, and the operating environment temperature can be set based on user requirements or according to actual conditions.
As an illustration in this embodiment:
according to the actual running current interval of the GIS equipment, 20 groups of actual measured current data at different moments are selected, the obtained 20 groups of actual measured current data are used as power frequency alternating current excitation of the GIS simplified three-dimensional model, and the 20 groups of actual measured current data are sequentially loaded on the conductor section of the GIS simplified three-dimensional model through finite element simulation software, so that the GIS equipment loss of the corresponding GIS equipment under the 20 groups of power frequency alternating current excitation is obtained.
And taking the GIS equipment loss of the corresponding GIS equipment under the excitation of 20 groups of power frequency alternating current as a heat source, and loading the GIS equipment loss as excitation of a GIS steady-state temperature field to correspondingly obtain steady-state temperature finite element results under 20 groups of different currents.
Step 103: and calculating and obtaining equivalent thermal resistance of the GIS equipment based on the GIS equipment loss and the GIS steady-state temperature finite element result, and solving a preset GIS shell-heating value fitting formula based on the equivalent thermal resistance and the GIS steady-state temperature finite element result to generate a GIS shell temperature calculation model.
In an embodiment, each GIS equipment loss and a GIS steady-state temperature finite element result corresponding to the GIS equipment loss are respectively substituted into a preset equivalent thermal resistance calculation formula, and a first equivalent thermal resistance of the GIS equipment under each GIS equipment loss is calculated and obtained.
In an embodiment, an equivalent thermal resistance calculation formula is preset based on the relationship between the temperature of the GIS shell, the temperature of the internal conductor and the overall heating value, and for GIS equipment, the overall heating value is GIS equipment loss.
In one embodiment, the equivalent thermal resistance calculation formula is as follows:
R＝(T i -T in )/Q；
wherein R is a first equivalent thermal resistance, T i Is the GIS shell temperature, T in And the temperature of the internal conductor of the GIS is the temperature, and the Q is the loss of GIS equipment.
In an embodiment, the first equivalent thermal resistance under the loss of all the GIS equipment is obtained, and the average value of all the first equivalent thermal resistances is calculated and used as the equivalent thermal resistance of the GIS equipment; and according to the heat transfer theory, the equivalent thermal resistance of the GIS equipment is related to the structural parameters of the GIS equipment, and after the average value is calculated according to the solution, the GIS equipment can be approximately considered to be unchanged by temperature change.
As an illustration of obtaining the equivalent thermal resistance of the GIS device in this embodiment:
based on 20 groups of steady-state temperature finite element results under different currents, each group of GIS steady-state temperature finite element results comprises GIS shell temperature, GIS inner conductor temperature and GIS equipment working environment temperature; substituting the 20 groups of steady-state temperature finite element results into a preset equivalent thermal resistance calculation formula respectively to obtain first equivalent resistors R corresponding to the 20 groups of steady-state temperature finite element results, namely, 20 groups of first equivalent resistors R under different currents, further calculating an average value of the 20 groups of first equivalent resistors R, and taking the calculated average equivalent resistors as the equivalent thermal resistance of the GIS equipment, wherein the equivalent thermal resistance is considered to be unchanged by temperature change.
In one embodiment, after the equivalent thermal resistance of the GIS equipment is obtained, the integral heating value of the GIS equipment is calculated and obtained based on the equivalent thermal resistance and the GIS steady-state temperature finite element result.
Specifically, based on the above mentioned relation between the GIS housing temperature, the internal conductor temperature and the overall heating value, under the condition of obtaining the equivalent thermal resistance of the GIS device, the method can further derive based on an equivalent thermal resistance calculation formula to obtain the overall heating value calculation formula, and substituting the equivalent thermal resistance and the GIS steady-state temperature finite element result into the overall heating value calculation formula to calculate and obtain the overall heating value of the GIS device under the equivalent thermal resistance.
In one embodiment, the overall calorific value calculation formula is as follows:
Q＝(T i -T in )/R 1 ；
wherein R is 1 And Q is the overall heating value of the GIS equipment and is equivalent thermal resistance.
In an embodiment, the whole heating value of the GIS device and the GIS steady-state temperature finite element result are input into a preset GIS shell-heating value fitting formula, and based on a global optimization method, parameter estimation is performed on an unknown convection heat dissipation coefficient set in the GIS shell-heating value fitting formula, so as to obtain a convection heat dissipation coefficient set.
In one embodiment, a predetermined GIS enclosure-heating value fitting formula is as follows:
Figure BDA0004132839830000111
wherein r is 1 The radiation heat dissipation coefficient is calculated by the radiation theory 1 Is a constant, p 1 、p 2 、p 3 、k 1 ，k 2 For the convection heat dissipation coefficient group, Q is the overall heat productivity of the GIS equipment, T i Is the GIS shell temperature, T in Is the temperature of the internal conductor of the GIS, T out The working environment temperature of the GIS equipment is obtained.
Because the parameters of the set of the convection heat dissipation coefficients in the GIS shell-heating value fitting formula are not determined, other known parameters meet the GIS shell-heating value fitting formula, so that the temperature data points are all located on the function, the parameters of the set of the unknown convection heat dissipation coefficients in the GIS shell-heating value fitting formula are estimated by a global optimization method, and the set of the convection heat dissipation coefficients at the optimal estimation time can be obtained.
In one embodiment, the convective heat dissipation coefficient set is substituted into the GIS shell-calorific value fitting formula to obtain the GIS shell temperature T i With the working environment temperature T of GIS equipment out And the relation between the overall heating value Q of the GIS equipment, and obtaining a GIS shell temperature calculation model based on the relation of the three.
As an illustration in this embodiment:
and under the condition that the equivalent resistance of the GIS equipment is determined, based on the GIS steady-state temperature finite element results corresponding to 20 groups of different currents, the overall heating value of the GIS equipment under 20 groups of different currents is recalculated based on the overall heating value calculation formula.
Based on 20 groups of GIS steady-state temperature finite element results and GIS equipment overall heating values corresponding to different currents, substituting each group of GIS steady-state temperature finite element results and GIS equipment overall heating values into a GIS shell-heating value fitting formula to obtain 20 groups of GIS shell-heating value fitting formula results, carrying out parameter estimation on convection heat dissipation coefficient groups in the 20 groups of GIS shell-heating value fitting formula results based on a global optimization method to obtain a convection heat dissipation coefficient group at the optimal estimation moment, and substituting the convection heat dissipation coefficient group into the GIS shell-heating value fitting formula to obtain a GIS shell temperature calculation model.
Step 104: and verifying the GIS shell temperature calculation model, if verification is passed, taking the GIS shell temperature calculation model as a digital twin calculation model, and if verification is failed, solving a preset GIS shell-heating value fitting formula based on the equivalent thermal resistance of the obtained GIS equipment and the GIS steady-state temperature finite element result, and generating a new GIS shell temperature calculation model until verification is passed.
In an embodiment, based on step 102, a GIS steady-state temperature finite element result corresponding to the GIS device loss is obtained, and the GIS shell temperature is extracted from the GIS steady-state temperature finite element result.
In an embodiment, the GIS equipment loss is used as the whole heating value of the GIS equipment and is input into the GIS shell temperature calculation model to obtain a first GIS shell temperature; and calculating a temperature error result between the GIS shell temperature and the first GIS shell temperature, if the temperature error result is smaller than a preset temperature error threshold value, determining that the verification of the GIS shell temperature calculation model passes, otherwise, determining that the verification of the GIS shell temperature calculation model fails.
Preferably, the preset temperature error threshold is 0.3 ℃.
As an illustration in this embodiment:
the GIS equipment loss under 20 groups of currents obtained from the steps is taken as the integral heating value Q of the GIS equipment, and the working environment temperature T of the GIS equipment is used as the heating value Q out Based on the user setting, the GIS equipment loss and the GIS equipment working environment temperature T under 20 groups of currents can be reduced to known values out Substituting the first GIS shell temperature into a GIS shell temperature calculation model, and directly obtaining the first GIS shell temperature under 20 groups of currents.
Comparing the first GIS shell temperature under the 20 groups of currents with the GIS shell temperature in the steady-state temperature finite element results under the 20 groups of different currents calculated based on finite element software in the step 102, if the temperature error results of the first GIS shell temperature and the GIS shell temperature are smaller than 0.3 ℃, determining that the verification of the GIS shell temperature calculation model is passed, taking the GIS shell temperature calculation model as a digital twin calculation model, otherwise, determining that the verification of the GIS shell temperature calculation model is failed.
And (3) under the condition that verification of the GIS shell temperature calculation model fails, repeating the steps 102-104 so as to obtain the equivalent thermal resistance and the GIS steady-state temperature finite element result of the GIS equipment again, solving a preset GIS shell-heating value fitting formula, and generating a new GIS shell temperature calculation model until verification passes.
In summary, according to the digital twin calculation model construction method of the GIS equipment, the GIS equipment loss of the GIS simplified three-dimensional model under the power frequency alternating current excitation is solved through finite element simulation software, and the GIS steady-state temperature field is solved to obtain a GIS steady-state temperature finite element result; based on the GIS equipment loss GIS steady-state temperature finite element result obtained by finite element simulation, the equivalent thermal resistance of the GIS equipment and the relation between the GIS shell temperature, the GIS equipment working environment temperature and the GIS equipment overall heating value are further solved, and a GIS shell temperature calculation model is constructed.
Example 2
Referring to fig. 2, fig. 2 is a schematic structural diagram of an embodiment of a digital twin calculation model building apparatus for a GIS device provided by the present invention, and as shown in fig. 2, the apparatus includes a GIS device model building module 201, a finite element simulation solving module 202, a GIS shell temperature calculation model generating module 203, and a GIS shell temperature calculation model verifying module 204, which are specifically as follows:
the GIS equipment model construction module 201 is configured to construct a GIS three-dimensional model, and simplify the GIS three-dimensional model to obtain a GIS simplified three-dimensional model.
The finite element simulation solving module 202 is configured to apply power frequency ac current excitation to the GIS simplified three-dimensional model based on finite element simulation software, calculate and solve a GIS steady-state temperature field based on GIS equipment loss under the power frequency ac current excitation, and obtain a GIS steady-state temperature finite element result.
The GIS shell temperature calculation model generating module 203 is configured to calculate and obtain an equivalent thermal resistance of the GIS device based on the GIS device loss and the GIS steady-state temperature finite element result, and solve a preset GIS shell-heating value fitting formula based on the equivalent thermal resistance and the GIS steady-state temperature finite element result, so as to generate a GIS shell temperature calculation model.
The GIS shell temperature calculation model verification module 204 is configured to verify the GIS shell temperature calculation model, if verification is passed, take the GIS shell temperature calculation model as a digital twin calculation model, and if verification is failed, solve a preset GIS shell-heating value fitting formula based on the obtained equivalent thermal resistance of the GIS device and the obtained GIS steady-state temperature finite element result, so as to generate a new GIS shell temperature calculation model until verification is passed.
In an embodiment, the GIS device model building module 201 is configured to build a GIS three-dimensional model, simplify the GIS three-dimensional model, and obtain a GIS simplified three-dimensional model, and specifically includes:
the method comprises the steps of obtaining prototype sizes of GIS equipment, and carrying out one-to-one modeling processing on the GIS equipment based on the prototype sizes to obtain a GIS three-dimensional model;
and acquiring and simplifying the structures of the conductors, the contact bases and the insulator inserts in the GIS three-dimensional model to obtain the GIS simplified three-dimensional model.
In one embodiment, the finite element simulation solving module 202 is configured to apply power frequency ac current excitation to the GIS simplified three-dimensional model, and calculate GIS device loss under the power frequency ac current excitation, and specifically includes:
selecting a plurality of currents at different moments, wherein the currents at different moments comprise a current at a maximum current value moment, a current at an average current value moment, a current at a median current value moment and a current at a minimum current value moment;
and based on each current, applying power frequency alternating current excitation to the GIS simplified three-dimensional model, and calculating the GIS equipment loss under each power frequency alternating current excitation.
In an embodiment, the finite element simulation solving module 202 is configured to solve a GIS steady-state temperature field based on a GIS device loss under the excitation of the power frequency ac current to obtain a GIS steady-state temperature finite element result, and specifically includes:
and obtaining GIS equipment loss under the excitation of each power frequency alternating current, solving a GIS steady-state temperature field by taking the GIS equipment loss as a heat source to obtain a GIS steady-state temperature finite element result corresponding to each GIS equipment loss, wherein the GIS steady-state temperature finite element result comprises a GIS shell temperature, a GIS inner conductor temperature and a GIS equipment working environment temperature.
In an embodiment, the GIS shell temperature calculation model generating module 203 is configured to calculate and obtain an equivalent thermal resistance of the GIS device based on the GIS device loss and the GIS steady-state temperature finite element result, and specifically includes:
substituting the loss of each GIS device and the GIS steady-state temperature finite element result corresponding to the loss of the GIS device into a preset equivalent thermal resistance calculation formula respectively, and calculating and obtaining the first equivalent thermal resistance of the GIS device under the loss of each GIS device;
and acquiring the first equivalent thermal resistance under the loss of all the GIS equipment, and calculating and taking the average value of all the first equivalent thermal resistances as the equivalent thermal resistance of the GIS equipment.
In an embodiment, the GIS shell temperature calculation model generating module 203 is configured to solve a preset GIS shell-heating value fitting formula based on the equivalent thermal resistance and the GIS steady-state temperature finite element result, to generate a GIS shell temperature calculation model, and specifically includes:
calculating and obtaining the integral heating value of the GIS equipment based on the equivalent thermal resistance and the GIS steady-state temperature finite element result;
inputting the overall heating value of the GIS equipment and the GIS steady-state temperature finite element result into a preset GIS shell-heating value fitting formula, and carrying out parameter estimation on an unknown convection heat dissipation coefficient set in the GIS shell-heating value fitting formula based on a global optimization method to obtain a convection heat dissipation coefficient set;
substituting the convection heat dissipation coefficient group into the GIS shell-heating value fitting formula to obtain a GIS shell temperature calculation model.
In one embodiment, the module 204 for verifying the GIS shell temperature calculation model is configured to verify the GIS shell temperature calculation model, and specifically includes:
acquiring a GIS steady-state temperature finite element result corresponding to the GIS equipment loss, and extracting the GIS shell temperature from the GIS steady-state temperature finite element result;
taking the GIS equipment loss as the overall heating value of the GIS equipment, and inputting the GIS equipment loss into the GIS shell temperature calculation model to obtain a first GIS shell temperature;
and calculating a temperature error result between the GIS shell temperature and the first GIS shell temperature, if the temperature error result is smaller than a preset temperature error threshold value, determining that the verification of the GIS shell temperature calculation model passes, otherwise, determining that the verification of the GIS shell temperature calculation model fails.
It will be clear to those skilled in the art that, for convenience and brevity of description, reference may be made to the corresponding process in the foregoing method embodiment for the specific working process of the above-described apparatus, which is not described in detail herein.
It should be noted that, the embodiment of the digital twin computing model building device of the GIS device is merely illustrative, where the modules described as separate components may or may not be physically separated, and the components displayed as the modules may or may not be physical units, may be located in one place, or may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In summary, the invention discloses a digital twin calculation model construction method and device of GIS equipment, which are characterized in that power frequency alternating current excitation is applied to a constructed GIS simplified three-dimensional model through finite element simulation software, and GIS steady-state temperature field is calculated and solved based on GIS equipment loss to obtain a GIS steady-state temperature finite element result; based on GIS equipment loss and GIS steady-state temperature finite element results, calculating and obtaining equivalent thermal resistance of GIS equipment, and based on the equivalent thermal resistance and the GIS steady-state temperature finite element results, solving a preset GIS shell-heating value fitting formula to generate a GIS shell temperature calculation model; verifying the GIS shell temperature calculation model, and if the verification is passed, taking the GIS shell temperature calculation model as a digital twin calculation model; compared with the prior art, the technical scheme of the invention can improve the calculation efficiency of the GIS equipment shell temperature.
The foregoing is merely a preferred embodiment of the present invention, and it should be noted that modifications and substitutions can be made by those skilled in the art without departing from the technical principles of the present invention, and these modifications and substitutions should also be considered as being within the scope of the present invention.

Claims (10)

1. The digital twin calculation model construction method of the GIS equipment is characterized by comprising the following steps of:
constructing a GIS three-dimensional model, and simplifying the GIS three-dimensional model to obtain a GIS simplified three-dimensional model;
applying power frequency alternating current excitation to the GIS simplified three-dimensional model based on finite element simulation software, calculating and solving a GIS steady-state temperature field based on GIS equipment loss under the power frequency alternating current excitation to obtain a GIS steady-state temperature finite element result;
calculating and obtaining equivalent thermal resistance of GIS equipment based on the GIS equipment loss and the GIS steady-state temperature finite element result, and solving a preset GIS shell-heating value fitting formula based on the equivalent thermal resistance and the GIS steady-state temperature finite element result to generate a GIS shell temperature calculation model;
and verifying the GIS shell temperature calculation model, if verification is passed, taking the GIS shell temperature calculation model as a digital twin calculation model, and if verification is failed, solving a preset GIS shell-heating value fitting formula based on the equivalent thermal resistance of the obtained GIS equipment and the GIS steady-state temperature finite element result, and generating a new GIS shell temperature calculation model until verification is passed.
2. The method for constructing a digital twin calculation model of GIS equipment according to claim 1, wherein the method for constructing a GIS three-dimensional model simplifies the GIS three-dimensional model to obtain a GIS simplified three-dimensional model, specifically comprises the following steps:
the method comprises the steps of obtaining prototype sizes of GIS equipment, and carrying out one-to-one modeling processing on the GIS equipment based on the prototype sizes to obtain a GIS three-dimensional model;
and acquiring and simplifying the structures of the conductors, the contact bases and the insulator inserts in the GIS three-dimensional model to obtain the GIS simplified three-dimensional model.
3. The method for constructing a digital twin calculation model of a GIS device according to claim 1, wherein a power frequency ac current excitation is applied to the GIS simplified three-dimensional model, and GIS device loss under the power frequency ac current excitation is calculated, specifically comprising:
selecting a plurality of currents at different moments, wherein the currents at different moments comprise a current at a maximum current value moment, a current at an average current value moment, a current at a median current value moment and a current at a minimum current value moment;
and based on each current, applying power frequency alternating current excitation to the GIS simplified three-dimensional model, and calculating the GIS equipment loss under each power frequency alternating current excitation.
4. The method for constructing a digital twin calculation model of GIS equipment according to claim 3, wherein solving the GIS steady-state temperature field based on the GIS equipment loss under the power frequency alternating current excitation to obtain a GIS steady-state temperature finite element result specifically comprises:
and obtaining GIS equipment loss under the excitation of each power frequency alternating current, solving a GIS steady-state temperature field by taking the GIS equipment loss as a heat source to obtain a GIS steady-state temperature finite element result corresponding to each GIS equipment loss, wherein the GIS steady-state temperature finite element result comprises a GIS shell temperature, a GIS inner conductor temperature and a GIS equipment working environment temperature.
5. The method for constructing a digital twin calculation model of a GIS device according to claim 1, wherein the method for constructing the digital twin calculation model of the GIS device is characterized by calculating and obtaining an equivalent thermal resistance of the GIS device based on the GIS device loss and the GIS steady-state temperature finite element result, and specifically comprises:
substituting the loss of each GIS device and the GIS steady-state temperature finite element result corresponding to the loss of the GIS device into a preset equivalent thermal resistance calculation formula respectively, and calculating and obtaining the first equivalent thermal resistance of the GIS device under the loss of each GIS device;
and acquiring the first equivalent thermal resistance under the loss of all the GIS equipment, and calculating and taking the average value of all the first equivalent thermal resistances as the equivalent thermal resistance of the GIS equipment.
6. The method for constructing a digital twin calculation model of a GIS device according to claim 1, wherein the method for constructing a GIS shell temperature calculation model is characterized by solving a preset GIS shell-heating value fitting formula based on the equivalent thermal resistance and the GIS steady-state temperature finite element result, and comprises the following steps:
calculating and obtaining the integral heating value of the GIS equipment based on the equivalent thermal resistance and the GIS steady-state temperature finite element result;
inputting the overall heating value of the GIS equipment and the GIS steady-state temperature finite element result into a preset GIS shell-heating value fitting formula, and carrying out parameter estimation on an unknown convection heat dissipation coefficient set in the GIS shell-heating value fitting formula based on a global optimization method to obtain a convection heat dissipation coefficient set;
substituting the convection heat dissipation coefficient group into the GIS shell-heating value fitting formula to obtain a GIS shell temperature calculation model.
7. The method for constructing a digital twin calculation model of a GIS device according to claim 4, wherein verifying the GIS shell temperature calculation model specifically comprises:
acquiring a GIS steady-state temperature finite element result corresponding to the GIS equipment loss, and extracting the GIS shell temperature from the GIS steady-state temperature finite element result;
taking the GIS equipment loss as the overall heating value of the GIS equipment, and inputting the GIS equipment loss into the GIS shell temperature calculation model to obtain a first GIS shell temperature;
and calculating a temperature error result between the GIS shell temperature and the first GIS shell temperature, if the temperature error result is smaller than a preset temperature error threshold value, determining that the verification of the GIS shell temperature calculation model passes, otherwise, determining that the verification of the GIS shell temperature calculation model fails.
8. The digital twin calculation model construction device of the GIS equipment is characterized by comprising the following components: the GIS equipment model building module, the finite element simulation solving module, the GIS shell temperature calculation model generating module and the GIS shell temperature calculation model verifying module;
the GIS equipment model construction module is used for constructing a GIS three-dimensional model and simplifying the GIS three-dimensional model to obtain a GIS simplified three-dimensional model;
the finite element simulation solving module is used for applying power frequency alternating current excitation to the GIS simplified three-dimensional model based on finite element simulation software, calculating and solving a GIS steady-state temperature field based on GIS equipment loss under the power frequency alternating current excitation to obtain a GIS steady-state temperature finite element result;
the GIS shell temperature calculation model generation module is used for calculating and obtaining equivalent thermal resistance of GIS equipment based on the GIS equipment loss and the GIS steady-state temperature finite element result, solving a preset GIS shell-heating value fitting formula based on the equivalent thermal resistance and the GIS steady-state temperature finite element result, and generating a GIS shell temperature calculation model;
the GIS shell temperature calculation model verification module is used for verifying the GIS shell temperature calculation model, if verification is passed, the GIS shell temperature calculation model is used as a digital twin calculation model, and if verification is failed, a preset GIS shell-heating value fitting formula is solved based on the obtained equivalent thermal resistance of the GIS equipment and the obtained GIS steady-state temperature finite element result, and a new GIS shell temperature calculation model is generated until verification is passed.
9. The digital twin calculation model construction device of a GIS device according to claim 8, wherein the finite element simulation solving module is configured to apply a power frequency ac current excitation to the GIS simplified three-dimensional model, and calculate a GIS device loss under the power frequency ac current excitation, and specifically includes:
selecting a plurality of currents at different moments, wherein the currents at different moments comprise a current at a maximum current value moment, a current at an average current value moment, a current at a median current value moment and a current at a minimum current value moment;
and based on each current, applying power frequency alternating current excitation to the GIS simplified three-dimensional model, and calculating the GIS equipment loss under each power frequency alternating current excitation.
10. The digital twin calculation model construction device of the GIS device according to claim 9, wherein the finite element simulation solving module is configured to solve a GIS steady-state temperature field based on GIS device loss under the excitation of the power frequency alternating current to obtain a GIS steady-state temperature finite element result, and specifically comprises:
and obtaining GIS equipment loss under the excitation of each power frequency alternating current, solving a GIS steady-state temperature field by taking the GIS equipment loss as a heat source to obtain a GIS steady-state temperature finite element result corresponding to each GIS equipment loss, wherein the GIS steady-state temperature finite element result comprises a GIS shell temperature, a GIS inner conductor temperature and a GIS equipment working environment temperature.
CN202310265268.7A 2023-03-17 2023-03-17 Digital twin calculation model construction method and device of GIS equipment Pending CN116306141A (en)

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