CN112733396A - Design method and system for cold insulation energized conductor of liquefied natural gas temperature zone - Google Patents
Design method and system for cold insulation energized conductor of liquefied natural gas temperature zone Download PDFInfo
- Publication number
- CN112733396A CN112733396A CN202011552189.7A CN202011552189A CN112733396A CN 112733396 A CN112733396 A CN 112733396A CN 202011552189 A CN202011552189 A CN 202011552189A CN 112733396 A CN112733396 A CN 112733396A
- Authority
- CN
- China
- Prior art keywords
- determining
- superconducting
- conductor
- cold insulation
- cold
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000004020 conductor Substances 0.000 title claims abstract description 136
- 238000009413 insulation Methods 0.000 title claims abstract description 90
- 238000013461 design Methods 0.000 title claims abstract description 41
- 239000003949 liquefied natural gas Substances 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000004804 winding Methods 0.000 claims abstract description 62
- 238000004364 calculation method Methods 0.000 claims abstract description 16
- 238000004422 calculation algorithm Methods 0.000 claims abstract description 7
- 230000008859 change Effects 0.000 claims description 9
- 238000001816 cooling Methods 0.000 claims description 9
- 238000005452 bending Methods 0.000 claims description 6
- 238000005457 optimization Methods 0.000 claims description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 10
- 230000005540 biological transmission Effects 0.000 description 7
- 238000011160 research Methods 0.000 description 6
- 238000012360 testing method Methods 0.000 description 6
- 238000004458 analytical method Methods 0.000 description 5
- 239000001307 helium Substances 0.000 description 5
- 229910052734 helium Inorganic materials 0.000 description 5
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 5
- 239000007788 liquid Substances 0.000 description 5
- 229910052757 nitrogen Inorganic materials 0.000 description 5
- 238000009826 distribution Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000000691 measurement method Methods 0.000 description 2
- 238000010791 quenching Methods 0.000 description 2
- 238000005057 refrigeration Methods 0.000 description 2
- 239000002887 superconductor Substances 0.000 description 2
- 230000032258 transport Effects 0.000 description 2
- 229910020073 MgB2 Inorganic materials 0.000 description 1
- 239000004642 Polyimide Substances 0.000 description 1
- PZKRHHZKOQZHIO-UHFFFAOYSA-N [B].[B].[Mg] Chemical compound [B].[B].[Mg] PZKRHHZKOQZHIO-UHFFFAOYSA-N 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000012938 design process Methods 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000002803 fossil fuel Substances 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 238000013178 mathematical model Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 229920001721 polyimide Polymers 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000003507 refrigerant Substances 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000002076 thermal analysis method Methods 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
Images
Classifications
-
- 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
- G06F2113/16—Cables, cable trees or wire harnesses
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/60—Superconducting electric elements or equipment; Power systems integrating superconducting elements or equipment
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Computer Hardware Design (AREA)
- Evolutionary Computation (AREA)
- Geometry (AREA)
- General Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Superconductors And Manufacturing Methods Therefor (AREA)
Abstract
The invention relates to a design method and a system of a cold insulation electrified conductor of a liquefied natural gas temperature zone. The method comprises the following steps: determining a configuration of a cold insulated energized conductor; determining critical current characteristics of a shaped superconducting tape used to wind a cold insulated electrical conductor; determining the winding radius of the superconducting tape based on the critical current characteristics and the mechanical characteristics of the superconducting tape; determining the winding helix angle range and the pitch range of the cold insulation electrified conductor according to the mechanical characteristics of the superconducting tape and the tape winding radius; determining the initial value of the design parameters of the electrified conductor of the high-temperature superconducting cable sample cable according to the range of the helix angle, the range of the thread pitch, the distance between the strips and the filling rate of the strips; and obtaining the optimized structural parameters and electromagnetic parameters of the electrified conductor of the high-temperature superconducting cable sample cable 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. The invention can make the current of each layer of the electrified conductor uniform in any working temperature region.
Description
Technical Field
The invention relates to the field of electrified conductor design, in particular to a method and a system for designing a cold insulation electrified conductor of a liquefied natural gas temperature zone.
Background
China is uneven in resource distribution, energy projects such as west-east power transmission and west-east power transmission, offshore wind power and Liquefied Natural Gas (LNG) stations are built in an accelerated mode, meanwhile, a superconducting power transmission technology is developed rapidly, an LNG cooling superconducting cable is used for achieving power/LNG integrated transmission, an energy channel can be shared, overall efficiency is improved, comprehensive cost is reduced, and an advanced technical scheme is provided for energy internet construction. Aiming at the special requirements of electricity/LNG integrated transportation, a high-temperature superconducting cable is adopted to transmit electric energy, the design research of a cold insulation direct-current high-temperature superconducting cable electrifying conductor for a +/-100 kV/1kA/30m superconducting direct-current energy pipeline for a superconducting direct-current energy pipeline is developed, and a design scheme is provided for developing a high-temperature superconducting cable electrifying conductor prototype for the superconducting direct-current energy pipeline.
At present, the main operation temperature area of the superconducting cable is a liquid nitrogen temperature area, namely about 77K, which is caused by the development of high-temperature superconducting materials and the low price and abundant resources of liquid nitrogen. However, there are many other temperature zones of superconducting cables under study and development. Many scholars at home and abroad also perform characteristic experimental analysis on the superconducting cable in the 20K temperature region. The method comprises the following steps that (1) Jianghua and the like of the Qinghua university in China adopt low-temperature helium as a refrigeration medium to research the body thermal analysis of a superconducting cable with magnesium diboride as a superconducting wire, the axial temperature distribution of the low-temperature helium and the heat leakage quantity of a cable body are solved, and the inlet temperature of a helium channel and the mass flow rate of the helium are optimized; suttel et al, performed simulation on superconducting cables using gaseous helium as a refrigerant to study thermal processes of transient states thereof, such as vacuum tube rupture, refrigeration cycle failure, and the like. According to all the searched documents, the high-temperature superconducting cable can be seen to continue to develop along the trend of transmitting electric quantity in a large-current high-voltage long-distance mode, and research can be conducted towards the energy sharing transmission direction. The test of a 6m/10kV/2kA hydrogen-electricity mixed transmission superconducting energy pipeline prototype is completed by the Chinese Power science research institute in 2017. The russian Alexander Chervyakov team also completed prototype testing of hydrogen-electricity hybrid transport of superconducting cables wound with MgB2 superconducting wires in 2017. At present, the work related to a 10m/10kV/1kA superconducting direct current energy pipeline starts under the funding of a project of a national grid science and technology project of an electrician place, "hydrogen-electricity hybrid superconducting transmission technology feasibility study" (DG71-16-004) and a leading edge scientific focus research project of a national academy of sciences "(QYZDJ-SSW-JSC 025) which superconducts basic research on energy and power, and the working temperature zone of the system is 85K-90K as the system transports fossil fuel while transporting power.
The prior art does not have a system and a method and a system for designing a cold insulation energized conductor of an LNG temperature zone.
Disclosure of Invention
The invention aims to provide a method and a system for designing a cold insulation electrified conductor in a liquefied natural gas temperature zone, which can homogenize the current of each layer of the electrified conductor in any working temperature zone.
In order to achieve the purpose, the invention provides the following scheme:
a design method of a cold insulation electrified conductor of a liquefied natural gas temperature zone comprises the following steps:
determining a configuration of a cold insulated energizing conductor, the cold insulated energizing conductor comprising a cold insulated AC high temperature superconducting cable or a cold insulated DC high temperature superconducting cable;
determining the critical current characteristic of the superconducting tape for winding the cold-insulation electrified conductor configuration based on the cold-insulation electrified conductor configuration and the superconducting tape critical current variation characteristic along with the magnetic field;
determining the winding radius of the superconducting tape based on the critical current characteristic and the mechanical characteristic of the superconducting tape;
determining the winding helix angle range and the pitch range of the cold insulation electrified conductor according to the mechanical characteristics of the superconducting tape and the winding radius of the tape;
acquiring the distance between the strips and the strip filling rate;
determining an initial value of a design parameter of the high-temperature superconducting cable-like electrified conductor according to the helix angle range, the pitch range, the distance between the strips and the strip filling rate;
and obtaining the optimized structural parameters and electromagnetic parameters of the electrified conductor of the high-temperature superconducting cable sample cable 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 configurations of the cold insulated energizing conductor include 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 energized conductor specifically includes:
and determining the configuration of the cold insulation high temperature superconducting cable electrified conductor according to at least one of the voltage grade, the consumption of the superconducting strip and the loss of the low temperature Dewar pipe.
Optionally, the determining, according to the mechanical property of the superconducting tape and the tape winding radius, a winding helix angle range and a pitch range of the cold-insulated energized conductor specifically includes:
adopting a formula according to the mechanical characteristics of the superconducting strip and the winding radius of the strip
Or
Determining the range of the winding helix angle and the range of the thread pitch of the cold insulation electrified conductor;
wherein epsilontIs the free heat shrinkage of the strip,. epsilonsFor the strain, epsilon, of the strip during coolingpIs the rate of change of pitch, epsilonrAnd R is the winding radius of the strip, and R is the critical bending radius of the strip.
Optionally, the determining, based on the configuration of the cold-insulated energized conductor and the characteristic of the change of the critical current of the superconducting tape with the magnetic field, the critical current characteristic of the superconducting tape used for winding the configuration of the cold-insulated energized conductor specifically includes:
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 operating current and determining the critical current on each layer of the superconducting cable body based on the configuration of the cold insulation electrified conductor and the characteristic that the critical current of the superconducting strip changes along with the magnetic field.
A liquefied natural gas temperature zone cold insulation circular telegram conductor design system includes:
the cold insulation electrified conductor configuration determining module is used for determining the configuration of a cold insulation electrified conductor, wherein the cold insulation electrified conductor comprises a cold insulation alternating current high-temperature superconducting cable or a cold insulation direct current high-temperature superconducting cable;
the critical current characteristic determining module is used for determining the critical current characteristic of the superconducting tape for winding the cold insulation electrified conductor based on the configuration of the cold insulation electrified conductor and the characteristic that the critical current of the superconducting tape changes along with the magnetic field;
the tape winding radius determining module is used for determining the tape winding radius based on the critical current characteristic and the mechanical characteristic of the superconducting tape;
the spiral angle range/pitch range determining module is used for determining the winding spiral angle range and the pitch range of the cold insulation electrified conductor according to the mechanical characteristics of the superconducting tape and the winding radius of the tape;
the device comprises a strip distance and filling rate acquisition module, a strip distance and filling rate acquisition module and a strip filling rate acquisition module, wherein 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 the initial value of the design parameter of the high-temperature superconducting cable-like electrified conductor according to the helix angle range, the thread pitch range, the distance between the strips and the strip filling rate;
and the optimization parameter determination module is used for obtaining the optimized structural parameters and electromagnetic parameters of the electrified conductor of the high-temperature superconducting cable sample cable 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 configurations of the cold insulated energizing conductor include 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-insulated energized conductor configuration determining module specifically includes:
and the cold insulation electrified conductor configuration determining unit is used for determining the configuration of the cold insulation high-temperature superconducting cable electrified conductor according to at least one of the voltage grade, the consumption of the superconducting strip 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 according to the mechanical characteristics of the superconducting tape and the winding radius of the tape
Or
Determining the range of the winding helix angle and the range of the thread pitch of the cold insulation electrified conductor;
wherein epsilontIs the free heat shrinkage of the strip,. epsilonsFor the strain, epsilon, of the strip during coolingpIs the rate of change of pitch, epsilonrAnd R is the winding radius of the strip, and R 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 operating current by utilizing the characteristic that the critical current of the superconducting strip changes along with the magnetic field based on the configuration of the cold insulation 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 of a 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 the requirements of technical indexes.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings 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 it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a flow chart of a method for designing a cold insulation energized conductor of a liquefied natural gas temperature zone according to the present invention;
fig. 2 is a structural diagram of a design system of a cold insulation electrified conductor in a liquefied natural gas temperature zone.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide a design method of a cold insulation electrified conductor in a liquefied natural gas temperature zone, which can homogenize the current of each layer of the electrified conductor in any working temperature zone.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
FIG. 1 is a flow chart of a method for designing a cold insulation electrified conductor in a liquefied natural gas temperature region according to the invention. As shown in fig. 1, a method for designing a cold insulation energized conductor in a liquefied natural gas temperature zone includes:
step 101: determining the configuration of a cold insulated energized conductor, specifically comprising:
and determining the configuration of the cold insulation high temperature superconducting cable electrified conductor according to at least one of the voltage grade, the consumption of the superconducting strip and the loss of the low temperature Dewar pipe.
The cold insulation electrifying conductor comprises a framework, a conductor layer, an insulation layer, a shielding layer and an outer protective sleeve, and the cold insulation electrifying conductor 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 current conductor generally comprises, from inside to outside in structure: skeleton, conductor layer, insulating layer, shielding layer and oversheath etc.. The framework is a support for winding the electrified conductor and can be a copper cable core or a corrugated pipe. The conductor layer is a plurality of layers of parallel superconducting tapes. The insulating layer is a cold insulating material, typically either PPLP or polyimide material may be chosen. The heat insulating layer is a low-temperature Dewar pipe 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 a single-core cold dielectric superconducting cable, a three-phase coaxial superconducting cable, and a three-phase concentric (three-phase parallel axis) superconducting cable according to the conductor structure. 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 the conductor structure.
For the configuration of the electrified conductor of the cold insulation AC/DC high-temperature superconducting cable, different configurations have the characteristics, a single-core structure is a good choice from the viewpoint of voltage grade, and the coaxiality is a good choice from the viewpoint of the consumption of superconducting strips and the loss of a low-temperature Dewar pipe.
And (4) comparing the configuration of the electrified conductor: the single-core structure is selected for the configuration of the high-temperature superconducting cable electrified conductor by combining the high voltage characteristic of the cold insulation direct current high-temperature superconducting cable electrified conductor for the +/-100 kV/1kA/30m superconducting direct current energy pipeline.
Because the preparation of the superconducting cable body needs to wind the high-temperature superconducting strip on the framework, the copper cable with the spiral pipeline is selected as the winding framework of the electrified conductor of the high-temperature superconducting cable by considering the factors of overcurrent impact shunt protection, bending, transportation, cold and hot shrinkage of the superconducting cable body, the rated capacity and the volume of the superconducting cable, the low-temperature characteristic of a liquid nitrogen cooling medium, the thermodynamic characteristic of a low-temperature Dewar pipe, a cooling mode, a circulating cooling system and the like.
Step 102: determining the critical current characteristic of the superconducting tape for winding the cold-insulated electrified conductor configuration based on the cold-insulated electrified conductor configuration and the superconducting tape critical current variation characteristic along with the magnetic field, and specifically comprising the following steps:
based on the configuration of the cold insulation electrified conductor, the size and the direction of the magnetic field on each layer of the superconducting cable body are determined according to the size and the direction of the operating current by utilizing the characteristic that the critical current of the superconducting strip changes along with the magnetic field, and the critical current on each layer of the superconducting cable body is determined.
According to the specification of the high-temperature superconducting strip for the high-temperature superconducting cable at the temperature of 77K and the electrical and mechanical parameters of the high-temperature superconducting strip. A critical current test platform covering an 85K-90K temperature zone is built, and the critical current distribution rule of the Bi2223 strip under different temperature zones is experimentally researched. Experimental sample Bi2223 strip produced by japan sumitomo electrician. The critical current characteristic test adopts an electrical measurement method. Experimental test sample wiring as shown in the following figure, the critical current of a test sample is judged by an electrical measurement method by measuring the current-voltage characteristic curve of a superconducting sample. Whether quench occurs or not is judged by measuring the voltage at two ends of a voltage lead through current for an experimental sample, and the quench criterion of the experiment is 1 mu V/cm. The experiment increases the liquid nitrogen temperature by pressurizing the dewar tube, and the large limit of the temperature rise which can be borne by the experimental device is 99.3K. And then, on the basis of a liquid nitrogen temperature zone, the pressure inside the Dewar pipe is reduced by vacuumizing the Dewar pipe so as to achieve the purpose of reducing the temperature. The low temperature that this experimental apparatus can reach is 69.3K. The power supply adopts a 600K superconducting magnet direct current source. The upflow velocity is set to be 0.5-2A/s.
The critical current was 203A at 77.8K, the Ic was 115A as the temperature increased to 90K, and the critical current decreased almost linearly with increasing temperature. And fitting the data by adopting a linear fitting method to obtain a mathematical model of the data. The linear equation is:
Ic(T)＝-6.96·T+739.86
where ic (T) is the critical current of the high temperature superconducting tape in the interval T epsilon (77K, 92K). From the relationship, it can be seen that the slope of this segment is-6.96, i.e., every 1K rise, Ic decreases by 6.96A. The critical current value at any temperature can be obtained by using the fitted curve.
And determining the magnitude and direction of the magnetic field on each layer of the superconducting cable body according to the magnitude and direction of the operating current by utilizing the characteristic that the critical current Ic of the superconducting strip changes along with the magnetic field, and determining the critical current on each layer of the superconducting cable body. Generally, the critical current of the high-temperature superconducting tape decreases along with the increase of the magnetic field; and meanwhile, the magnetic field has strong anisotropy, namely the critical current is not only related to the magnitude of the magnetic field, but also has great relation to the direction of the magnetic field.
Since the perpendicular magnetic field component has a greater influence 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 parallel field. Therefore, the influence of the magnetic field on the critical current must be considered for designing the high-temperature superconducting cable current conductor.
In the case of a low magnetic field, the critical currents at the perpendicular magnetic field and the parallel magnetic field are calculated as follows:
among the anisotropies of the first generation of high temperature superconducting tapes, there are the following models that describe the change of critical current in the 77k temperature region according to the magnitude and direction of the magnetic field:
(1) in the dc magnetic field B, the relationship between the critical current and the magnetic field is:
in the formula Ic0Is the critical current of the superconducting strip under self-field, B||And B⊥Absolute values of the parallel and perpendicular components, B, respectively, of the magnetic field in which the superconductive tape is placed0Is the fitting constant, here taken to be 1T.
(2) The relationship between I _ c and B introduced into the effective mass tensor model is as follows:
Ic(B，θ)＝Ic(εθ，B)
in the formula, epsilonθIs a function of the angle θ and is:
where ε is a parameter expressing the anisotropy, which is related to the effective mass of the superconductor grains:
in the formula, mabAnd mcThe effective mass of the superconductor grains along the ab-plane and c-axis respectively,
and
critical fields along the ab-plane and c-axis of the superconducting grains, respectively.
3) In the two-dimensional vortex model, the relationship between I _ c and B can be described as:
Ic(B，θ)＝Ic(Bsinθ)
(4) without considering the micro mechanism, the corresponding relation can be obtained by the empirical relation of I _ c and B,
in the formula, B||Being the parallel component of the magnetic field B, B⊥Is the vertical component of the magnetic field B, Ic||(B||) Critical current of superconducting strip in parallel component of the magnetic field B, Ic⊥(B⊥) Critical current of superconducting strip in the perpendicular component of the magnetic field B, Ic(0) Is the critical current of the superconducting tape under the self-field thereof.
(5) Based on the intrinsic nail binding model, the Keys model and the effective mass model, the analysis and comparison are carried out, 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 performing iterative calculation on the operating current and the magnetic field according to the critical current Ic and the operating margin to obtain the critical current and the optimal operating current of each layer of the cable, and finally determining the number of the layers of the superconducting tapes of the superconducting cable body and the number of the superconducting tapes of each layer. The formula number is determined by total current/(critical current of single strip material) running margin. The number of each layer of the n layers of high-temperature superconducting cable bodies used is as follows: n1, N2, … and Nn are the number of the superconducting tapes on the 1 st layer, the 2 nd layer, … and the nth layer of the conductor respectively. The pitch angle and pitch affect the magnetic field distribution, which corresponds to the magnitude of the critical current. The winding helix angle and the length L of the superconducting tape are related as follows:
wherein L is0And L is the net length of the cable body and the actual length of the single superconducting tape used, respectively.
And determining the winding helix angle according to the winding helix angle range of the formula. And according to the winding radius r of the superconducting cable strip to be selected0And determining the winding helix angle, determining the winding pitch Lp：
Magnetic field B along the circumferential direction of each layer of the cableiθAnd a magnetic field B in the axial directionizCan be obtained by an analytical method and a finite element method, and the calculation of the analytical method is as follows:
step 103: determining the winding radius of the superconducting tape based on the critical current characteristic and the mechanical characteristic of the superconducting tape;
step 104: according to the mechanical characteristics of the superconducting tape and the winding radius of the tape, determining the range of the winding helix angle and the range of the thread pitch of the cold insulation electrified conductor, and specifically comprising the following steps:
adopting a formula according to the mechanical characteristics of the superconducting strip and the winding radius of the strip
Or
Determining the range of the winding helix angle and the range of the thread pitch of the cold insulation electrified conductor;
wherein epsilontIs the free heat shrinkage of the strip,. epsilonsFor the strain, epsilon, of the strip during coolingpIs the rate of change of pitch, epsilonrThe radial shrinkage of the conductor layer, R is the winding radius of the strip, and R is the stripCritical radius of curvature of the material.
When R is less than or equal to R, use
When R > R, use
Step 105: acquiring the distance between the strips and the strip filling rate;
step 106: and determining the initial value of the design parameters of the high-temperature superconducting cable-like cable-through conductor according to the helix angle range, the pitch range, the distance between the strips and the strip filling rate.
Step 107: and obtaining the optimized structural parameters and electromagnetic parameters of the electrified conductor of the high-temperature superconducting cable sample cable 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.
Fig. 2 is a structural diagram of a design system of a cold insulation electrified conductor in a liquefied natural gas temperature zone. As shown in fig. 2, a system for designing a cold insulation energized conductor in a liquefied natural gas temperature zone includes:
a cold insulation energized conductor configuration determining module 201 is configured to determine a configuration of a cold insulation energized conductor, which includes a cold insulation alternating current high temperature superconducting cable or a cold insulation direct current high temperature superconducting cable.
The critical current characteristic determining module 202 is configured to determine a critical current characteristic of the superconducting tape for winding the configuration of the cold-insulated electrified conductor, based on the configuration of the cold-insulated electrified conductor and a characteristic of the superconducting tape that a critical current changes with a magnetic field.
And the strip winding radius determining module 203 is used for determining the winding radius of the strip based on the critical current characteristic and the mechanical characteristic of the superconducting strip.
A helix angle range/pitch range determining module 204, configured to determine a winding helix angle range and a pitch range of the cold-insulated energized conductor according to the mechanical characteristics of the superconducting tape and the tape winding radius.
And the strip distance and filling rate acquisition module 205 is used for acquiring the distance between the strips and the strip filling rate.
And a design parameter initial value determining module 206, configured to determine an initial value of a design parameter of the high temperature superconducting cable-like cable-through conductor according to the helix angle range, the pitch range, the distance between the tapes, and the tape filling rate.
And the optimized parameter determining module 207 is used for substituting the principle of the ant colony algorithm and iterative calculation into the calculation of the electromagnetic parameters of the high-temperature superconducting cable based on the initial values of the design parameters to obtain the optimized structural parameters and electromagnetic parameters of the electrified conductor of the high-temperature superconducting cable sample cable.
The configuration of 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 energized conductor configuration determining module 201 specifically includes:
and the cold insulation electrified conductor configuration determining unit is used for determining the configuration of the cold insulation high-temperature superconducting cable electrified conductor according to at least one of the voltage grade, the consumption of the superconducting strip and the loss of the low-temperature Dewar pipe.
The helix angle/pitch determining module 203 specifically includes:
a helix angle/pitch determining unit for applying a formula according to the mechanical characteristics of the superconducting tape and the tape winding radius
Or
Determining the range of the winding helix angle and the range of the thread pitch of the cold insulation electrified conductor;
wherein epsilontIs the free heat shrinkage of the strip,. epsilonsFor the strain, epsilon, of the strip during coolingpIs the rate of change of pitch, epsilonrAnd R is the winding radius of the strip, and R 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 operating current by utilizing the characteristic that the critical current of the superconducting strip changes along with the magnetic field based on the configuration of the cold insulation 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 of a 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 the technical index requirements by analyzing multiple physical fields of the superconducting cable body and optimizing design parameters according to the experimental result of a short sample of the superconducting cable.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. For the system disclosed by the embodiment, the description is relatively simple because the system corresponds to the method disclosed by the embodiment, and the relevant points can be referred to the method part for description.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (10)
1. A design method of a cold insulation electrified conductor of a liquefied natural gas temperature zone is characterized by comprising the following steps:
determining a configuration of a cold insulated energizing conductor, the cold insulated energizing conductor comprising a cold insulated AC high temperature superconducting cable or a cold insulated DC high temperature superconducting cable;
determining the critical current characteristic of the superconducting tape for winding the cold-insulation electrified conductor configuration based on the cold-insulation electrified conductor configuration and the superconducting tape critical current variation characteristic along with the magnetic field;
determining the winding radius of the superconducting tape based on the critical current characteristic and the mechanical characteristic of the superconducting tape;
determining the winding helix angle range and the pitch range of the cold insulation electrified conductor according to the mechanical characteristics of the superconducting tape and the winding radius of the tape;
acquiring the distance between the strips and the strip filling rate;
determining an initial value of a design parameter of the high-temperature superconducting cable-like electrified conductor according to the helix angle range, the pitch range, the distance between the strips and the strip filling rate;
and obtaining the optimized structural parameters and electromagnetic parameters of the electrified conductor of the high-temperature superconducting cable sample cable 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.
2. The design method of the cold insulation energizing conductor in the liquefied natural gas temperature zone as claimed in claim 1, wherein the configuration of the cold insulation energizing conductor includes 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.
3. The method for designing the cold-insulated electrified conductor in the liquefied natural gas temperature zone according to claim 1, wherein the determining of the configuration of the cold-insulated electrified conductor specifically comprises:
and determining the configuration of the cold insulation high temperature superconducting cable electrified conductor according to at least one of the voltage grade, the consumption of the superconducting strip and the loss of the low temperature Dewar pipe.
4. The method for designing a cold-insulated electrified conductor in a liquefied natural gas temperature zone according to claim 1, wherein the determining of the range of the winding helix angle and the range of the pitch of the cold-insulated electrified conductor according to the mechanical characteristics of the superconducting tapes and the winding radius of the tapes specifically comprises:
adopting a formula according to the mechanical characteristics of the superconducting strip and the winding radius of the strip
Or
Determining the range of the winding helix angle and the range of the thread pitch of the cold insulation electrified conductor;
wherein epsilontIs the free heat shrinkage of the strip,. epsilonsFor the strain, epsilon, of the strip during coolingpIs the rate of change of pitch, epsilonrAnd R is the winding radius of the strip, and R is the critical bending radius of the strip.
5. The method for designing the cold-insulated electrified conductor in the liquefied natural gas temperature zone according to claim 1, wherein the determining the critical current characteristic of the superconducting tape for winding the cold-insulated electrified conductor configuration based on the configuration of the cold-insulated electrified conductor and the change characteristic of the superconducting tape critical current with the magnetic field specifically comprises:
based on the configuration of the cold insulation electrified conductor, the size and the direction of the magnetic field on each layer of the superconducting cable body are determined according to the size and the direction of the operating current by utilizing the characteristic that the critical current of the superconducting strip changes along with the magnetic field, and the critical current on each layer of the superconducting cable body is determined.
6. The utility model provides a liquefied natural gas warm area cold insulation circular telegram conductor design system which characterized in that includes:
the cold insulation electrified conductor configuration determining module is used for determining the configuration of a cold insulation electrified conductor, wherein the cold insulation electrified conductor comprises a cold insulation alternating current high-temperature superconducting cable or a cold insulation direct current high-temperature superconducting cable;
the critical current characteristic determining module is used for determining the critical current characteristic of the superconducting tape for winding the cold insulation electrified conductor based on the configuration of the cold insulation electrified conductor and the characteristic that the critical current of the superconducting tape changes along with the magnetic field;
the tape winding radius determining module is used for determining the tape winding radius based on the critical current characteristic and the mechanical characteristic of the superconducting tape;
the spiral angle range/pitch range determining module is used for determining the winding spiral angle range and the pitch range of the cold insulation electrified conductor according to the mechanical characteristics of the superconducting tape and the winding radius of the tape;
the device comprises a strip distance and filling rate acquisition module, a strip distance and filling rate acquisition module and a strip filling rate acquisition module, wherein 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 the initial value of the design parameter of the high-temperature superconducting cable-like electrified conductor according to the helix angle range, the thread pitch range, the distance between the strips and the strip filling rate;
and the optimization parameter determination module is used for obtaining the optimized structural parameters and electromagnetic parameters of the electrified conductor of the high-temperature superconducting cable sample cable 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.
7. The liquefied natural gas temperature zone cold insulation energizing conductor design system according to claim 6, wherein the configuration of the cold insulation energizing conductor includes 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.
8. The liquefied natural gas temperature zone cold insulation electrified conductor design system of claim 6, wherein the cold insulation electrified conductor configuration determination module specifically comprises:
and the cold insulation electrified conductor configuration determining unit is used for determining the configuration of the cold insulation high-temperature superconducting cable electrified conductor according to at least one of the voltage grade, the consumption of the superconducting strip and the loss of the low-temperature Dewar pipe.
9. The liquefied natural gas temperature zone cold insulation energized conductor design system of claim 6, wherein the helix angle/pitch determination module specifically comprises:
a helix angle/pitch determining unit for applying a formula according to the mechanical characteristics of the superconducting tape and the winding radius of the tape
Or
Determining the range of the winding helix angle and the range of the thread pitch of the cold insulation electrified conductor;
wherein epsilontIs the free heat shrinkage of the strip,. epsilonsFor the strain, epsilon, of the strip during coolingpIs the rate of change of pitch, epsilonrAnd R is the winding radius of the strip, and R is the critical bending radius of the strip.
10. The liquefied natural gas temperature zone cold insulation energized conductor design system of claim 6, 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 operating current by utilizing the characteristic that the critical current of the superconducting strip changes along with the magnetic field based on the configuration of the cold insulation electrified conductor, and determining the critical current on each layer of the superconducting cable body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011552189.7A CN112733396B (en) | 2020-12-24 | 2020-12-24 | Design method and system for cold insulation electrified conductor in liquefied natural gas temperature zone |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011552189.7A CN112733396B (en) | 2020-12-24 | 2020-12-24 | Design method and system for cold insulation electrified conductor in liquefied natural gas temperature zone |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112733396A true CN112733396A (en) | 2021-04-30 |
| CN112733396B CN112733396B (en) | 2024-01-09 |
Family
ID=75615596
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011552189.7A Active CN112733396B (en) | 2020-12-24 | 2020-12-24 | Design method and system for cold insulation electrified conductor in liquefied natural gas temperature zone |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112733396B (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5371484A (en) * | 1991-04-04 | 1994-12-06 | Insulated Wire Incorporated | Internally ruggedized microwave coaxial cable |
| CN101246767A (en) * | 2008-03-26 | 2008-08-20 | 华北电力大学 | Design method of high-temperature superconducting cable/busbar main body |
| CN101404193A (en) * | 2008-11-18 | 2009-04-08 | 华北电力大学 | Design method for coaxial bidirectional transmission direct-current high-temperature superconducting cable body |
| CN106877255A (en) * | 2017-03-23 | 2017-06-20 | 江苏恒旭电力科技有限公司 | Gas-insulated transmission line spiral welded pipe |
| CN108754388A (en) * | 2018-05-31 | 2018-11-06 | 中国科学院宁波材料技术与工程研究所 | A kind of metal/polymer composite core silk material, metal/polymer composite coating and preparation method thereof |
| CN112069733A (en) * | 2020-09-03 | 2020-12-11 | 中国科学院电工研究所 | Current sharing optimization method and system for high-temperature superconducting direct current cable for energy pipeline |
-
2020
- 2020-12-24 CN CN202011552189.7A patent/CN112733396B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5371484A (en) * | 1991-04-04 | 1994-12-06 | Insulated Wire Incorporated | Internally ruggedized microwave coaxial cable |
| CN101246767A (en) * | 2008-03-26 | 2008-08-20 | 华北电力大学 | Design method of high-temperature superconducting cable/busbar main body |
| CN101404193A (en) * | 2008-11-18 | 2009-04-08 | 华北电力大学 | Design method for coaxial bidirectional transmission direct-current high-temperature superconducting cable body |
| CN106877255A (en) * | 2017-03-23 | 2017-06-20 | 江苏恒旭电力科技有限公司 | Gas-insulated transmission line spiral welded pipe |
| CN108754388A (en) * | 2018-05-31 | 2018-11-06 | 中国科学院宁波材料技术与工程研究所 | A kind of metal/polymer composite core silk material, metal/polymer composite coating and preparation method thereof |
| CN112069733A (en) * | 2020-09-03 | 2020-12-11 | 中国科学院电工研究所 | Current sharing optimization method and system for high-temperature superconducting direct current cable for energy pipeline |
Non-Patent Citations (1)
| Title |
|---|
| 孟宪东: "高温超导大电流母线导体层优化设计", 《稀有金属材料与工程》, vol. 37, no. 4, pages 355 - 358 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112733396B (en) | 2024-01-09 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Ballarino et al. | The BEST PATHS project on MgB 2 superconducting cables for very high power transmission | |
| Fetisov et al. | Study of the first russian triaxial HTS cable prototypes | |
| Chen et al. | Preliminary design and evaluation of large‐diameter superconducting cable toward GW‐class hybrid energy transfer of electricity, liquefied natural gas, and liquefied nitrogen | |
| Xiao et al. | Performance of highly flexible sub-cable for REBCO cable-in-conduit conductor at 5.8 T applied field | |
| CN110705104B (en) | Simulation analysis method for current density distribution of high-temperature superconducting conductor | |
| Zhu et al. | Experimental investigation of a high temperature superconducting pancake consisted of the REBCO composite cable for superconducting magnetic energy storage system | |
| Jin et al. | A composite superconducting energy pipeline and its characteristics | |
| Hernando et al. | Optimization of High Power SMES for Naval Applications | |
| Ueda et al. | R&D of a 500 m superconducting cable in Japan | |
| Nie et al. | Numerical analysis and experiment of critical current of a preliminary CICC model made from quasi-isotropic strands | |
| Zheng et al. | Electromagnetic and stability study on HTS/LTS hybrid superconducting central solenoid | |
| Zhang et al. | A single-phase AC HTS cable with high current-carrying capacity and low loss | |
| CN112733396B (en) | Design method and system for cold insulation electrified conductor in liquefied natural gas temperature zone | |
| Shi et al. | Investigation on AC losses of a quasi-isotropic strand made from REBCO coated conductors | |
| Savoldi et al. | Thermal-hydraulic models for the cooling of HTS power-transmission cables: status and needs | |
| Zhang et al. | Experimental and numerical study of current distribution of superconducting composite conductor with REBCO tapes for power electric applications | |
| Zuijderduin | Integration of high-Tc superconducting cables in the dutch power grid of the future | |
| Sadeghi et al. | A simple and fast computation equivalent circuit model to investigate the effect of tape twisting on the AC loss of HTS cables | |
| Li et al. | Comparative study of superconducting dc energy pipelines with different bipolar structural layouts | |
| Chen et al. | High-Current Stacked HTS Conductors With Non-uniform Gaps: Critical Current, AC Loss, and Fault Tolerance | |
| Xu et al. | Research on impedance balance design and optimization of triaxial HTS cable | |
| Li et al. | Engineering design of forced-flow cooling HTS cable for SMES system with high current capacity | |
| Jin et al. | Development of HTS cable-based transmission systems for renewables | |
| Zhang et al. | Research on the current carrying capacity of an HTS power cable used in energy pipeline | |
| Yan et al. | Research on Dynamic Resistance and Magnetization Loss of CORC Windings for Superconducting AC Homopolar Machines |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |