CN112733396B - Design method and system for cold insulation electrified conductor in liquefied natural gas temperature zone - Google Patents

Design method and system for cold insulation electrified conductor in liquefied natural gas temperature zone Download PDF

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CN112733396B
CN112733396B CN202011552189.7A CN202011552189A CN112733396B CN 112733396 B CN112733396 B CN 112733396B CN 202011552189 A CN202011552189 A CN 202011552189A CN 112733396 B CN112733396 B CN 112733396B
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determining
superconducting
tape
cold
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CN112733396A (en
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张东
杜晓纪
宋乃浩
滕玉平
靖立伟
张京业
邱清泉
张国民
肖立业
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Institute of Electrical Engineering of CAS
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F30/00—Computer-aided design [CAD]
    • 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
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B12/00—Superconductive or hyperconductive conductors, cables, or transmission lines
    • H01B12/02—Superconductive or hyperconductive conductors, cables, or transmission lines characterised by their form
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2113/00—Details relating to the application field
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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 relates to a design method and a system for a cold insulation electrified conductor in an liquefied natural gas temperature region. The method comprises the following steps: determining the configuration of the cold insulated energized conductor; determining critical current characteristics of the superconducting tape for configuration around the cryogenically insulated energized conductor; determining a tape winding radius based on the critical current characteristic and the mechanical characteristic of the superconducting tape; determining a winding helix angle range and a pitch range of the cold insulation electrified conductor according to the mechanical properties of the superconducting tape and the winding radius of the tape; determining an initial value of a design parameter of the high-temperature superconducting cable sample cable electrified conductor according to the helical angle range, the helical pitch range, the distance between the strips and the strip filling rate; based on the initial value of the design parameter, the optimized structural parameter and electromagnetic parameter of the high-temperature superconducting cable sample cable electrified conductor are obtained by utilizing an ant colony algorithm, an iterative calculation method and a high-temperature superconducting cable electromagnetic parameter calculation method. The invention can make the current of each layer of the conductive body uniform in any working temperature area.

Description

Design method and system for cold insulation electrified conductor in liquefied natural gas temperature zone
Technical Field
The invention relates to the field of electrified conductor design, in particular to a liquefied natural gas temperature zone cold insulation electrified conductor design method and system.
Background
The resources of China are unevenly distributed, the construction of energy projects such as Western electric east delivery and Western electric east delivery, offshore wind power and Liquefied Natural Gas (LNG) stations and the like is accelerated, meanwhile, superconducting transmission technology is rapidly developed, an LNG cooling superconducting cable is utilized to realize integrated power/LNG delivery, an energy channel can be shared, the overall efficiency is improved, the comprehensive cost is reduced, and an advanced technical scheme is provided for energy Internet construction. Aiming at the special requirement of integrated electric/LNG (liquefied Natural gas) transportation, a high-temperature superconducting cable is adopted to transmit electric energy, the design research of a +/-100 kV/1kA/30m superconducting direct current energy pipeline cold insulation direct current high-temperature superconducting cable power-on conductor is developed, and a design scheme is provided for developing a high-temperature superconducting cable power-on conductor prototype for the superconducting direct current energy pipeline.
The main operation temperature region of the superconducting cable is a liquid nitrogen temperature region, namely about 77K, which is caused by the development of high-temperature superconducting materials and the low cost and abundant resources of liquid nitrogen. However, there are many other temperature zone superconducting cables under investigation and development. Many scholars at home and abroad also conduct characteristic experimental analysis of the superconducting cable in a 20K temperature area. Jiang Xiaohua et al of Qinghua university in China adopts low-temperature helium gas as a refrigerating medium to study the body thermal analysis of a superconducting cable with magnesium diboride as a superconducting wire, obtains the axial temperature distribution of the low-temperature helium gas and the heat leakage quantity of the cable body, and optimizes the inlet temperature of a helium gas channel and the mass flow rate of the helium gas; the nickel g.suttel et al performed simulated simulations of superconducting cables using gaseous helium as the refrigerant to investigate the transient thermal processes, such as vacuum tube breaks, refrigeration cycle failures, etc. According to all the documents, the high-temperature superconducting cable can be seen to continuously develop along the trend direction of the large-current high-voltage long-distance transmission electric quantity, and the research and the study can be carried out towards the energy sharing transmission direction. The China electric science institute of 2017 completes the test of a hydrogen-electricity mixed transmission superconducting energy pipeline prototype of 6m/10kV/2 kA. The russian Alexander Chervyakov team also completed prototype testing of the hybrid transportation of hydrogen and electricity of MgB2 superconducting wire wound superconducting cables in 2017. At present, the work related to 10m/10kV/1kA superconducting direct current energy pipeline is started under the project of the national grid science and technology project of the electrician's field of technology, "hydrogen-electricity hybrid superconducting transmission technology feasibility research" (DG 71-16-004) and the leading scientific key research project of the national academy of sciences of China, "basic research on energy and electric power" (QYZDJ-SSW-JSC 025), and the working temperature area of the system is between 85K and 90K because the system is used for conveying fossil fuel while conveying electric power.
The prior art has no systematic design method and system for the cold insulation energizing conductor of the LNG temperature zone.
Disclosure of Invention
The invention aims to provide a design method and a system for a cold insulation energizing conductor in an liquefied natural gas temperature region, which can homogenize currents of all layers of the energizing conductor in any working temperature region.
In order to achieve the above object, the present invention provides the following solutions:
a design method of a cold insulation electrified conductor in an liquefied natural gas temperature region comprises the following steps:
determining the configuration of a cold insulation energizing conductor, wherein the cold insulation energizing conductor comprises a cold insulation alternating current high temperature superconducting cable or a cold insulation direct current high temperature superconducting cable;
determining critical current characteristics of a superconducting tape used for winding the configuration of the cold insulated energized conductor based on the configuration of the cold insulated energized conductor and the critical current characteristics of the superconducting tape along with the magnetic field;
determining a tape-winding radius based on the critical current characteristic and a mechanical characteristic of the superconducting tape;
determining a winding helix angle range and a pitch range of a cold insulated energized conductor according to the mechanical properties of the superconducting tape and the tape winding radius;
obtaining the distance between the strips and the filling rate of the strips;
determining initial values of design parameters of the electrified conductor of the superconducting cable sample cable according to the helical angle range, the helical pitch range, the distance between the strips and the strip filling rate;
based on the initial value of the design parameter, the optimized structural parameter and electromagnetic parameter of the high-temperature superconducting cable sample cable electrified conductor are obtained by utilizing an ant colony algorithm, an iterative calculation method and a high-temperature superconducting cable electromagnetic parameter calculation method.
Optionally, the configuration of the cold insulated energized conductor includes a single core cold insulated superconducting cable structure, a three phase concentric superconducting cable structure, a three phase coaxial superconducting cable structure, and a two pole coaxial superconducting cable structure.
Optionally, the determining the configuration of the cold insulated energizing conductor specifically includes:
and determining the configuration of the cold insulation high-temperature superconducting cable lead-through conductor according to at least one of the voltage grade, the consumption of the superconducting tape and the loss of the low-temperature dewar pipe.
Optionally, the determining a range of winding helix angles and a range of pitches of the cold insulated energized conductor according to the mechanical properties of the superconducting tape and the tape winding radius specifically includes:
the formula is adopted according to the mechanical properties of the superconducting tape and the winding radius of the tapeOr->Determining the range of the winding helix angle and the range of the pitch of the cold insulation energized conductor;
wherein ε t Epsilon for free heat shrinkage of the strip s Epsilon is the strain of the strip during cooling p For the rate of change of pitch, ε r The radial shrinkage of the conductor layer is represented by R, which is the radius of the wound strip and R, which is the critical bending radius of the strip.
Optionally, the determining the critical current characteristic of the superconducting tape used for winding the configuration of the cold insulation energizing conductor based on the configuration of the cold insulation energizing conductor and the critical current characteristic of the superconducting tape along with the magnetic field comprises the following specific steps:
and determining the size and the direction of the magnetic field on each layer of the superconducting cable body according to the size and the direction of the running current based on the configuration of the cold insulated electrified conductor and the characteristic that the critical current of the superconducting tape changes along with the magnetic field, and determining the critical current on each layer of the superconducting cable body.
A lng warm zone cold insulated energized conductor design system comprising:
the cold insulation energizing conductor configuration determining module is used for determining the configuration of a cold insulation energizing conductor, wherein the cold insulation energizing conductor comprises a cold insulation alternating current high temperature superconducting cable or a cold insulation direct current high temperature superconducting cable;
a critical current characteristic determination module for determining critical current characteristics of the superconducting tape for winding the configuration of the cold insulated energizing conductor based on the configuration of the cold insulated energizing conductor and the characteristic of the superconducting tape critical current as a function of the magnetic field;
a tape winding radius determination module for determining a tape winding radius based on the critical current characteristic and a mechanical characteristic of the superconducting tape;
a helix angle range/pitch range determining module for determining a winding helix angle range and a pitch range of the cold insulated energized conductor according to the mechanical properties of the superconducting tape and the tape winding radius;
the strip distance and filling rate acquisition module is used for acquiring the distance between strips and the filling rate of the strips;
the design parameter initial value determining module is used for determining initial values of design parameters of the electrified conductor of the superconducting cable sample cable according to the helical angle range, the helical pitch range, the distance between the strips and the strip filling rate;
and the optimization parameter determining module is used for obtaining the optimized structural parameters and electromagnetic parameters of the high-temperature superconducting cable sample cable electrified conductor by utilizing an ant colony algorithm, an iterative calculation method and a high-temperature superconducting cable electromagnetic parameter calculation method based on the initial values of the design parameters.
Optionally, the configuration of the cold insulated energized conductor includes a single core cold insulated superconducting cable structure, a three phase concentric superconducting cable structure, a three phase coaxial superconducting cable structure, and a two pole coaxial superconducting cable structure.
Optionally, the cold insulation energizing conductor configuration determining module specifically includes:
and the cold insulation power-on conductor configuration determining unit is used for determining the configuration of the cold insulation high-temperature power-on conductor of the superconducting cable according to at least one of the voltage grade, the consumption of the superconducting tape and the loss of the low-temperature dewar pipe.
Optionally, the helix angle/pitch determining module specifically includes:
a helix angle/pitch determining unit for applying a formula based on the mechanical properties of the superconducting tape and the tape winding radiusOr->Determining the range of the winding helix angle and the range of the pitch of the cold insulation energized conductor;
wherein ε t Epsilon for free heat shrinkage of the strip s Epsilon is the strain of the strip during cooling p For the rate of change of pitch, ε r The radial shrinkage of the conductor layer is represented by R, which is the radius of the wound strip and R, which is the critical bending radius of the strip.
Optionally, the critical current characteristic determining module specifically includes:
and the critical current characteristic determining unit is used for determining the magnitude and the direction of the magnetic field on each layer of the superconducting cable body according to the magnitude and the direction of the running current by utilizing the characteristic that the critical current of the superconducting tape changes along with the magnetic field based on the configuration of the cold insulated electrified conductor, and determining the critical current on each layer of the superconducting cable body.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
the invention provides a design method of a cold insulation electrified conductor in an liquefied natural gas temperature zone, which optimizes design parameters by analyzing multiple physical fields of a superconducting cable body and combining experimental results of short samples of the superconducting cable, and realizes the structural design of the superconducting cable body with technical advancement and economic superiority on the premise of meeting technical index requirements.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of the design method of the cold insulation electrified conductor in the liquefied natural gas temperature region;
FIG. 2 is a block diagram of a cold insulated energized conductor design system in the LNG temperature range of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. 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.
The invention aims to provide a design method of a cold insulation energizing conductor in an liquefied natural gas temperature region, which can homogenize currents of all layers of the energizing conductor in any working temperature region.
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.
FIG. 1 is a flow chart of the method for designing the cold insulation electrified conductor in the liquefied natural gas temperature region. As shown in fig. 1, a method for designing a cold insulation energizing conductor in an lng temperature zone includes:
step 101: determining the configuration of a cold insulated energized conductor, comprising:
and determining the configuration of the cold insulation high-temperature superconducting cable lead-through conductor according to at least one of the voltage grade, the consumption of the superconducting tape and the loss of the low-temperature dewar pipe.
The cold insulation energizing conductor comprises a framework, a conductor layer, an insulating layer, a shielding layer and an outer protective sleeve, and comprises a cold insulation alternating current high-temperature superconducting cable or a cold insulation direct current high-temperature superconducting cable.
The cold insulated high temperature superconducting energized conductor generally comprises, from inside to outside in structure: skeleton, conductor layer, insulating layer, shielding layer and oversheath etc.. The skeleton is a support wound by an electrified conductor and can be a copper cable core or a corrugated pipe. The conductor layer is a plurality of layers of superconductive tapes connected in parallel. The insulating layer is a cold insulating material, and a PPLP or polyimide material is typically selected. The heat insulating layer is a low-temperature Dewar tube for maintaining the low-temperature working environment of the electrified conductor. The shielding layer is used for shielding electromagnetic and uniform electric fields, and the outer sheath is used for physical and chemical protection of the cable. The classification of ac superconducting cables is classified into single-core cold-insulated superconducting cables, three-phase coaxial superconducting cables, and three-phase concentric (three-phase parallel axis) superconducting cables according to conductor structures. The classification of the direct current superconducting cable is divided into a single-core cold insulation superconducting cable and a bipolar coaxial superconducting cable according to a conductor structure.
For the cold insulation AC/DC high temperature superconducting cable energizing conductor configuration, different configurations are characterized, the single-core structure is a good choice from the voltage grade, and the coaxiality is a good choice from the consumption of superconducting tapes and the loss of the low temperature Dewar tube.
Comparison and selection conclusion of the configuration of the energized conductors: the single-core structure is selected by combining the high voltage characteristics of the cold insulation direct-current high-temperature superconducting cable power-on conductor for the +/-100 kV/1kA/30m superconducting direct-current energy pipeline, and the configuration of the high-temperature superconducting cable power-on conductor.
Because the preparation of the superconducting cable body needs to wind the high-temperature superconducting tape on the skeleton, the superconducting cable body skeleton selects the copper cable with the spiral pipeline as the winding skeleton of the high-temperature superconducting cable energizing conductor in consideration of the factors of overcurrent impact shunt protection, bending, transportation, cold and heat shrinkage of the superconducting cable body, rated capacity and volume of the superconducting cable, low-temperature characteristics of liquid nitrogen cooling medium, thermodynamic characteristics of a low-temperature Dewar tube, a cooling mode, a circulating cooling system and the like.
Step 102: determining critical current characteristics of the superconducting tape used for winding the configuration of the cold insulated energizing conductor based on the configuration of the cold insulated energizing conductor and the critical current characteristics of the superconducting tape along with the magnetic field, specifically comprising:
and determining the size and the direction of the magnetic field on each layer of the superconducting cable body according to the size and the direction of the running current by utilizing the characteristic that the critical current of the superconducting tape changes along with the magnetic field based on the configuration of the cold insulating electrified conductor, and determining the critical current on each layer of the superconducting cable body.
According to the specification of the high-temperature superconductive tape for the high-temperature superconductive cable at 77K and the electrical and mechanical parameters thereof. A critical current test platform covering 85K-90K temperature areas is built, and the critical current distribution rule of the Bi2223 strip under different temperature areas is experimentally researched. Experimental sample Bi2223 tape produced by japanese alumni electrician. The critical current characteristic test adopts an electrical measurement method. Experimental test sample wiring as shown in the following figure, the electrical measurement method is to determine the critical current of the test sample by measuring the volt-ampere characteristic curve of the superconducting sample. And (3) judging whether the test sample is quenched by measuring the voltages at two ends of the voltage lead through current, wherein the test uses 1 mu V/cm as a quenching criterion. The experiment increased the liquid nitrogen temperature by pressurizing the dewar tube, and the large limit of temperature rise that the experimental set-up could withstand was 99.3K. Then, on the basis of a liquid nitrogen temperature zone, the pressure inside the Dewar tube is reduced by vacuumizing the Dewar tube so as to achieve the aim of cooling. The low temperature reached by the experimental set-up was 69.3K. The power supply adopts a 600K superconducting magnet direct current source. The upflow speed is set to be 0.5-2A/s.
The critical current was 203A at 77.8K, and Ic was 115A when the temperature was increased to 90K, and the critical current decreased nearly linearly with increasing temperature. And adopting a linear fitting method to fit the data to obtain a mathematical model of the data. The linear equation is:
Ic(T)＝-6.96·T+739.86
wherein Ic (T) is the critical current of the superconductive tape in the interval of T epsilon (77K, 92K). From the relationship, it can be seen that the slope of this line segment is-6.96, i.e., the ic drops by 6.96A for each 1K increase. The critical current value at any temperature can be obtained by using the fitted curve.
And determining the size and the direction of the magnetic field on each layer of the superconducting cable body according to the size and the direction of the running current by utilizing the characteristic that the critical current Ic of the superconducting tape changes along with the magnetic field, and determining the critical current on each layer of the superconducting cable body. The critical current of the high-temperature superconductive tape generally decreases along with the increase of the magnetic field; and has strong anisotropism, namely, the critical current is not only related to the magnitude of the magnetic field, but also has a great relationship with the direction of the magnetic field.
Since the perpendicular magnetic field component has a greater effect on the critical current than the parallel magnetic field component. Therefore, the vertical field component should be minimized during the design process. The effect of the vertical field on the critical current is much more severe than the effect of the parallel field. Therefore, for the design of the high temperature superconducting cable power conductor, the influence of the magnetic field on the critical current must be considered.
In the case of a lower magnetic field, the critical currents under perpendicular and parallel magnetic fields are calculated as follows:
in the anisotropy of the first generation of high temperature superconducting tapes, the following models are known to describe the change of critical current with the magnitude and direction of magnetic field at 77k temperature:
(1) In the direct current magnetic field B, the relationship between the critical current and the magnetic field is:
wherein I is c0 Is critical current of superconducting tape under self-field, B || And B ⊥ Absolute values of parallel component and vertical component under magnetic field of superconducting tape respectively, B 0 Is a fitting constant, here 1T.
(2) The relationship between i_c and B, which introduces the effective mass tensor model, is as follows:
I c (B，θ)＝I c (εθ，B)
wherein ε θ Is a function of the angle θ, which is:
where ε is a parameter that expresses anisotropy, which is related to the effective mass of superconductor grains:
wherein m is ab And m c The effective masses of the superconductor grains along the ab-plane and c-axis respectively,and->Critical fields along the ab-plane and c-axis, respectively, of the superconducting grain.
3) In the two-dimensional vortex model, the relationship between I_c and B can be described as:
I c (B，θ)＝I c (Bsinθ)
(4) Regardless of the microscopic mechanism, its corresponding relationship can be obtained by an empirical relationship of I c and B,
wherein B is || Is the parallel component of the magnetic field B, B ⊥ Is the vertical component of the magnetic field B, I c|| (B || ) For the critical current of the superconducting tape under the parallel component of the magnetic field B, I c⊥ (B ⊥ ) For the critical current of the superconducting tape under the vertical component of the magnetic field B, I c (0) Is the critical current of the superconducting tape in its own field.
(5) Based on an intrinsic nail binding model, a Kais model and an effective mass model are analyzed and compared, and meanwhile, the following formula is obtained by combining the analysis of experimental data, so that the relation of the critical current along with the background magnetic field under different angles can be obtained:
and carrying out iterative calculation on the operation current and the magnetic field according to the critical current Ic and the operation margin to obtain the critical current and the optimal operation current of each layer of the cable, and finally determining the number of superconducting tape layers and the number of superconducting tapes of each layer of the superconducting cable body. Specifically, the formula root=total current/(critical current of single strip) ×running margin) is adopted for determination. The number of each layer of the used n-layer high-temperature superconducting cable body is as follows: n1, N2, …, nn are the number of superconducting tapes on the 1 st, 2 nd, … nd, N th layers of the conductor, respectively. The pitch angle and the pitch affect the magnetic field distribution, which corresponds to the magnitude of the critical current. The wound helix angle has the following relation with the length L of the superconductive tape used:
wherein L is 0 And L is the net length of the cable body and the single actual length of the superconducting tape used, respectively.
And winding the spiral angle range according to the formula, and determining the winding spiral angle. And winding radius r according to the superconducting cable strip to be selected 0 And a determined winding helix angle, a determined winding pitch L p ：
Magnetic field B along the circumferential direction of the layers of the cable iθ And a magnetic field B in the axial direction iz Can be obtained by an analytical method and a finite element method, and the analytical method is calculated as follows:
step 103: determining a tape-winding radius based on the critical current characteristic and a mechanical characteristic of the superconducting tape;
step 104: determining a winding helix angle range and a pitch range of a cold insulated energized conductor according to the mechanical properties of the superconducting tape and the tape winding radius, and specifically comprising:
the formula is adopted according to the mechanical properties of the superconducting tape and the winding radius of the tapeOr->Determining the range of the winding helix angle and the range of the pitch of the cold insulation energized conductor;
wherein ε t Epsilon for free heat shrinkage of the strip s Epsilon is the strain of the strip during cooling p For the rate of change of pitch, ε r The radial shrinkage of the conductor layer is represented by R, which is the radius of the wound strip and R, which is the critical bending radius of the strip.
When R is less than or equal to R, adopting
When R > R, use is made of
Step 105: obtaining the distance between the strips and the filling rate of the strips;
step 106: and determining initial values of design parameters of the high-temperature superconducting cable-like cable electrified conductor according to the helical angle range, the helical pitch range, the distance between the strips and the strip filling rate.
Step 107: based on the initial value of the design parameter, the optimized structural parameter and electromagnetic parameter of the high-temperature superconducting cable sample cable electrified conductor are obtained by utilizing an ant colony algorithm, an iterative calculation method and a high-temperature superconducting cable electromagnetic parameter calculation method.
FIG. 2 is a block diagram of a cold insulated energized conductor design system in the LNG temperature range of the present invention. As shown in fig. 2, a lng warm zone cold insulated energized conductor design system, comprising:
a cold insulated energized conductor configuration determination module 201 for determining a configuration of a cold insulated energized conductor comprising a cold insulated ac high temperature superconducting cable or a cold insulated dc high temperature superconducting cable.
A critical current characteristic determination module 202 for determining a critical current characteristic of the superconducting tape for winding the configuration of the cold insulated energized conductor based on the configuration of the cold insulated energized conductor and a superconducting tape critical current characteristic as a function of magnetic field.
A tape winding radius determination module 203 for determining a tape winding radius based on the critical current characteristic and the mechanical characteristic of the superconducting tape.
A helix angle range/pitch range determination module 204 for determining a winding helix angle range and a pitch range of the cold insulated energized conductor based on the mechanical properties of the superconducting tape and the tape winding radius.
The strip distance and filling rate obtaining module 205 is configured to obtain a distance between strips and a filling rate of the strips.
A design parameter initial value determining module 206, configured to determine an initial value of a design parameter of the cable-like electrified conductor of the superconducting cable according to the helix angle range, the pitch range, the distance between the strips, and the strip filling rate.
The optimization parameter determining module 207 is configured to obtain the optimized structural parameter and electromagnetic parameter of the high-temperature superconducting cable sample cable conductive conductor by substituting the principle and iterative calculation of the ant colony algorithm into the electromagnetic parameter calculation of the high-temperature superconducting cable based on the initial value of the design parameter.
The cold insulation electrified conductor comprises a single-core cold insulation superconducting cable structure, a three-phase concentric superconducting cable structure, a three-phase coaxial superconducting cable structure and a two-pole coaxial superconducting cable structure.
The cold insulation energizing conductor configuration determining module 201 specifically includes:
and the cold insulation power-on conductor configuration determining unit is used for determining the configuration of the cold insulation high-temperature power-on conductor of the superconducting cable according to at least one of the voltage grade, the consumption of the superconducting tape and the loss of the low-temperature dewar pipe.
The helix angle/pitch determination module 203 specifically includes:
a helix angle/pitch determining unit for applying a formula based on the mechanical properties of the superconducting tape and the tape winding radiusOr->Determining the range of the winding helix angle and the range of the pitch of the cold insulation energized conductor;
wherein ε t Epsilon for free heat shrinkage of the strip s Epsilon is the strain of the strip during cooling p For the rate of change of pitch, ε r The radial shrinkage of the conductor layer is represented by R, which is the radius of the wound strip and R, which is the critical bending radius of the strip.
The critical current characteristic determining module 202 specifically includes:
and the critical current characteristic determining unit is used for determining the magnitude and the direction of the magnetic field on each layer of the superconducting cable body according to the magnitude and the direction of the running current by utilizing the characteristic that the critical current of the superconducting tape changes along with the magnetic field based on the configuration of the cold insulated electrified conductor, and determining the critical current on each layer of the superconducting cable body.
The invention provides a design method and a system for a cold insulation electrified conductor in an liquefied natural gas temperature zone, which are used for realizing the structural design of a superconducting cable body with technical advancement and economic superiority on the premise of meeting technical index requirements by analyzing multiple physical fields of the superconducting cable body and optimizing design parameters by combining experimental results of short samples of the superconducting cable.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other. For the system disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant points refer to the description of the method section.
The principles and embodiments of the present invention have been described herein with reference to specific examples, the description of which is intended only to assist in understanding the methods of the present invention and the core ideas thereof; also, it is within the scope of the present invention to be modified by those of ordinary skill in the art in light of the present teachings. In view of the foregoing, this description should not be construed as limiting the invention.

Claims (6)

1. The design method of the cold insulation electrified conductor in the liquefied natural gas temperature area is characterized by comprising the following steps of:
determining the configuration of a cold insulated energized conductor, comprising: determining the configuration of a cold insulation high-temperature superconducting cable lead-through conductor according to at least one of the voltage grade, the consumption of the superconducting tape and the loss of the low-temperature dewar pipe; the cold insulation energizing conductor comprises a framework, a conductor layer, an insulation layer, a shielding layer and an outer protective sleeve; the framework is a copper cable with a spiral pipeline; the cold insulation energizing conductor comprises a cold insulation alternating current high temperature superconducting cable or a cold insulation direct current high temperature superconducting cable; the cold insulation electrified conductor comprises a single-core cold insulation superconducting cable structure, a three-phase concentric superconducting cable structure, a three-phase coaxial superconducting cable structure and a two-pole coaxial superconducting cable structure;
determining critical current characteristics of a superconducting tape used for winding the configuration of the cold insulated energized conductor based on the configuration of the cold insulated energized conductor and the critical current characteristics of the superconducting tape along with the magnetic field;
determining a tape-winding radius based on the critical current characteristic and a mechanical characteristic of the superconducting tape;
determining a winding helix angle range and a pitch range of a cold insulated energized conductor according to the mechanical properties of the superconducting tape and the tape winding radius;
obtaining the distance between the strips and the filling rate of the strips;
determining initial values of design parameters of the electrified conductor of the superconducting cable sample cable according to the helical angle range, the helical pitch range, the distance between the strips and the strip filling rate;
based on the initial value of the design parameter, the optimized structural parameter and electromagnetic parameter of the high-temperature superconducting cable sample cable electrified conductor are obtained by utilizing an ant colony algorithm, an iterative calculation method and a high-temperature superconducting cable electromagnetic parameter calculation method.
2. The method for designing a cold insulated conductor in the lng temperature range according to claim 1, wherein the range of the winding helix angle and the range of the pitch of the cold insulated conductor are determined based on the mechanical properties of the superconducting tape and the tape winding radius, and specifically comprising:
the formula is adopted according to the mechanical properties of the superconducting tape and the winding radius of the tapeOr->Determining the range of the winding helix angle and the range of the pitch of the cold insulation energized conductor;
wherein ε t Epsilon for free heat shrinkage of the strip s Epsilon is the strain of the strip during cooling p For the rate of change of pitch, ε r The radial shrinkage of the conductor layer is represented by R, which is the radius of the wound strip and R, which is the critical bending radius of the strip.
3. The method for designing a cold insulated energized conductor in an lng temperature zone according to claim 1, wherein determining the critical current characteristics of the superconducting tape used for winding the configuration of the cold insulated energized conductor based on the configuration of the cold insulated energized conductor and the characteristic of the critical current of the superconducting tape as a function of the magnetic field, specifically comprises:
and determining the size and the direction of the magnetic field on each layer of the superconducting cable body according to the size and the direction of the running current by utilizing the characteristic that the critical current of the superconducting tape changes along with the magnetic field based on the configuration of the cold insulating electrified conductor, and determining the critical current on each layer of the superconducting cable body.
4. A lng warm area cold insulated energized conductor design system comprising:
the cold insulation energizing conductor configuration determining module is used for determining the configuration of a cold insulation energizing conductor, wherein the cold insulation energizing conductor comprises a cold insulation alternating current high temperature superconducting cable or a cold insulation direct current high temperature superconducting cable; the cold insulation electrified conductor comprises a single-core cold insulation superconducting cable structure, a three-phase concentric superconducting cable structure, a three-phase coaxial superconducting cable structure and a two-pole coaxial superconducting cable structure;
the cold insulation energizing conductor configuration determining module specifically comprises:
a cold insulation energizing conductor configuration determining unit for determining a configuration of a cold insulation high temperature superconducting cable energizing conductor according to at least one of a voltage class, an amount of superconducting tape, and a loss of the low temperature dewar pipe; the cold insulation energizing conductor comprises a framework, a conductor layer, an insulation layer, a shielding layer and an outer protective sleeve; the framework is a copper cable with a spiral pipeline;
a critical current characteristic determination module for determining critical current characteristics of the superconducting tape for winding the configuration of the cold insulated energizing conductor based on the configuration of the cold insulated energizing conductor and the characteristic of the superconducting tape critical current as a function of the magnetic field;
a tape winding radius determination module for determining a tape winding radius based on the critical current characteristic and a mechanical characteristic of the superconducting tape;
a helix angle range/pitch range determining module for determining a winding helix angle range and a pitch range of the cold insulated energized conductor according to the mechanical properties of the superconducting tape and the tape winding radius;
the strip distance and filling rate acquisition module is used for acquiring the distance between strips and the filling rate of the strips;
the design parameter initial value determining module is used for determining initial values of design parameters of the electrified conductor of the superconducting cable sample cable according to the helical angle range, the helical pitch range, the distance between the strips and the strip filling rate;
and the optimization parameter determining module is used for obtaining the optimized structural parameters and electromagnetic parameters of the high-temperature superconducting cable sample cable electrified conductor by utilizing an ant colony algorithm, an iterative calculation method and a high-temperature superconducting cable electromagnetic parameter calculation method based on the initial values of the design parameters.
5. The lng warm area cold insulated energized conductor design system of claim 4, wherein the helix angle/pitch determination module specifically comprises:
a helix angle/pitch determining unit for applying a formula based on the mechanical properties of the superconducting tape and the tape winding radiusOr (b)
Determining the range of the winding helix angle and the range of the pitch of the cold insulation energized conductor;
wherein ε t Epsilon for free heat shrinkage of the strip s Epsilon is the strain of the strip during cooling p For the rate of change of pitch, ε r The radial shrinkage of the conductor layer is represented by R, which is the radius of the wound strip and R, which is the critical bending radius of the strip.
6. The lng cold insulation energized conductor design system of claim 4, wherein the critical current characteristic determination module specifically comprises:
and the critical current characteristic determining unit is used for determining the magnitude and the direction of the magnetic field on each layer of the superconducting cable body according to the magnitude and the direction of the running current by utilizing the characteristic that the critical current of the superconducting tape changes along with the magnetic field based on the configuration of the cold insulated electrified conductor, and determining the critical current on each layer of the superconducting cable body.
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