CN107611961B - A kind of electric current uniform distribution method for direct supercurrent cable - Google Patents
A kind of electric current uniform distribution method for direct supercurrent cable Download PDFInfo
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Abstract
The embodiment of the invention provides a kind of electric current uniform distribution methods for direct supercurrent cable.This method specifically includes that the circuit model of the multi-parallel superconductive tape of building direct supercurrent cable and designs implementing device, after direct supercurrent cable is powered, each parallel branch passes through the current sensor Real-time Feedback DC current being attached thereto to regulation device, regulation device handles the current signal of each branch acquisition, regulation electric current needed for calculating each branch according to circuit model, the regulation electric current being calculated is delivered to the coupling device of each branch by regulation device by transmission line, different regulation current couplings are subjected to resnstance transformer into corresponding each branch, it realizes in each branch and actually passes through balanced current distribution.The present invention supports to adjust the Real-time Feedback of each branch current, realizes and evenly distributes to the electric current of direct supercurrent cable, and in the present invention to the regulating mechanism of each superconduction branch in parallel outside low temperature environment, it is easy to accomplish, convenient for operation.
Description
Technical field
The present invention relates to superconductive power cable technical field more particularly to a kind of electric current for direct supercurrent cable are uniform
Distribution method.
Background technique
High-temperature superconductor direct current cables has many advantages, such as line loss is low, transmission capacity is big, corridor takes up little area, is environmental-friendly,
A kind of efficient, compact, reliable, green electric energy transmission mode is provided for power grid.By the development of more than ten years, direct supercurrent electricity
Cable has been achieved with huge progress in terms of basic research, has also there is multiple direct supercurrent cable power transmission demonstrative projects both at home and abroad
It puts into operation.Consider the factors such as electric power energy demand sustainable growth, new energy accounting rapid increase, can realize simultaneously efficiently
The direct supercurrent technology of transmission of electricity of low-loss and large-capacity power conveying will play bigger effect following, and application prospect is very wide
It is wealthy.
In the prior art, hyperconductive cable usually uses more superconductive tape parallel connections to realize big transmission electric current.It is ideal
In the case of, superconductor is zero resistance, and there is no electric currents to distribute non-uniform problem.But in practical application, due to superconduction it
Between non-superconducting welding, the non-superconducting connection between superconduction and terminal, the critical current of different branch superconductive tape and N value unevenness
The characteristic of the factors such as even property, each superconductive tape in parallel is not fully identical, and the otherness of each parallel branch connection attachment etc. also can
Cause the impedance of each branch different.Will cause each branch in this way, there are the small resistance that a resistance value is not quite similar, quantity
Grade be probably in the μ of 100n Ω~10 Ω or so, although the resistance very little that above-mentioned reason introduces, between small difference can cause
Electric current distribution is uneven between different parallel branches, i.e., when used in parallel, the electric current for flowing through each superconductive tape in parallel is not identical.
In practical applications, if the current-carrying of hyperconductive cable is much smaller than critical current, current-unbalance will cause electric current to exist
Circulation between superconductive tape in parallel, the current-carrying that can reduce hyperconductive cable is horizontal, can't generate baneful influence.But it once carries
Near critical current, the small superconductive tape of critical current can quench stream first, and into there is resistance state, the time is slightly long, it will grows into
" hot spot (hot-pot) ", there are the risks that further malignant development causes superconductive tape to blow.In addition, individual superconductive tapes, which enter, to be had
After resistance state, current-carrying is reduced, then other superconductive tapes, which will shunt, to increase；The fever for quenching superconductive tape also causes other superconductive tapes of periphery
Environment temperature increases.This reacts the linksystem for causing superconductive tape, until hyperconductive cable quenches completely.If it is in fault condition
Under, i.e., under the short-circuit current percussion much higher than critical current, consequence caused by the lack of uniformity of superconductive tape in parallel
It will be even more serious.
A kind of current-carring characteristic for direct supercurrent cable changes method in the prior art are as follows: existing research shows superconduction
Ac cable is by alternating current, and there are alternating magnetic field around superconductor, specific magnetic field will change the current-carring characteristic of superconductive tape.
The elements such as relative position, twisted pitch and angle by control superconductive tape can reduce each in parallel super to a certain extent
The otherness of conduction band can improve the harmony of superconductive tape current-carrying in parallel in very big current range.
But, the above method is unobvious to the superconductive tape current balance effect in parallel of direct supercurrent cable.
Summary of the invention
It is above-mentioned to solve the embodiment provides a kind of electric current uniform distribution method for direct supercurrent cable
Problem of the existing technology.
To achieve the goals above, this invention takes following technical solutions.
The invention proposes a kind of electric current uniform distribution methods for direct supercurrent cable characterized by comprising
The circuit model for constructing the multi-parallel superconductive tape of direct supercurrent cable, establishes mathematics side according to the circuit model
Journey, the implementing device of design current uniform distribution method, the implementing device mainly include regulation device and coupling device；
After the current bus bar of direct supercurrent cable is powered, each parallel branch passes through the electric current in the tie point being attached thereto
Sensor Real-time Feedback DC current signal is to regulation device, and the regulation device is based on the DC current signal, according to institute
State circuit model the math equation calculate each branch needed for regulation electric current；
The regulation electric current being calculated is delivered in each branch tie point by the regulation device by transmission line
The regulation current coupling is carried out resnstance transformer into each branch connected and realizes each branch by coupling device, the coupling device
Middle electric current evenly distributes.
Preferably, the circuit model of the multi-parallel superconductive tape of the building direct supercurrent cable, according to the circuit mould
Type establishes math equation, comprising:
The direct supercurrent cable includes more superconductive tapes in parallel, and each superconductive tape constitutes a parallel connection
Branch；
The circuit model includes: a current bus bar and multiple parallel branches, wherein the composition packet of the parallel branch
It includes: the conventional resistive R that non-superconducting part is constitutedNi, the nonlinear resistance R of superconductive part compositionHTSi, alternating current passes through each parallel connection
The induction reactance L that branch generatesi, existing mutual inductance M between different parallel branchesij.Wherein, RHTSiWith the amplitude and frequency for passing through electric current
There are mapping relations；
According to the circuit model, founding mathematical models are as follows:
Preferably, the implementing device that the design current evenly distributes, comprising:
The implementing device includes: current bus bar, regulation device, tie point, transmission line and each conduction band in parallel；
The tie point is placed on each conduction band in parallel, including current sensor and coupling device；
The regulation device is connected with the tie point of each parallel branch respectively by transmission line；
The transmission line includes two parts: a part is used for regulation device conveying regulation electric current to tie point, a part
DC current signal is passed back to the regulation device by the current sensor at tie point.
Preferably, after the current bus bar by direct supercurrent cable is powered, each parallel branch passes through phase therewith
Current sensor Real-time Feedback DC current signal in tie point even is to regulation device, comprising:
There is a tie point in each parallel branch respectively, the current sensor in the tie point is for acquiring each
The DC current signal of Lu Zhongcong current bus bar outflow, and DC current signal collected is fed back to by transmission line passback
The regulation device.
Preferably, the regulation device is based on the DC current signal, according to the mathematics of the circuit model
Regulation electric current needed for equation calculation goes out each branch, comprising:
The regulation device includes current regulation mechanism, frequency adjustment mechanism, feedback control unit and output end, described anti-
The current signal that feedback control unit is acquired and fed back according to each parallel branch, the mathematics side based on the circuit model
Journey calculates the amplitude and frequency of the regulation electric current coupled needed for each parallel branch.
Preferably, the regulation electric current being calculated is delivered to each branch by transmission line and connected by the regulation device
Coupling device in contact, comprising:
The current regulation mechanism and the frequency adjustment mechanism in the regulation device carry out control operation, adjust institute
The amplitude and frequency for stating regulation electric current will be described after being consistent with the regulation electric current being calculated for regulation current regulation
Regulate and control electric current and the coupling device that the transmission line is applied to corresponding parallel branch is connected by output end；
The different output ends of the regulation device are mutually indepedent, and the regulation electric current of different output end outputs is mutually only
It is vertical.
Preferably, the regulation current coupling is carried out resnstance transformer into each branch connected by the coupling device
Realize that electric current evenly distributes in each branch, comprising:
It is separately adjustable to different branch progress that the mutually independent regulation electric current is exported in the regulation device, mutually solely
Vertical coupling device of the regulation electric current through the tie point is connect with each parallel branch, and the current bus bar flows into each parallel connection
The DC current of branch becomes each parallel branch reality after coupling with the regulation electric current through the coupling device passes through electric current,
Different branch is by actually passing through balanced current distribution after regulating and controlling the coupling of electric current.
Preferably, the transmission line includes two parts: a part for regulation device conveying regulation electric current to tie point,
DC current signal is passed back to the regulation device by the current sensor of a part at tie point, comprising:
The two-part setting method of the transmission line: using the method for the different core wires for sharing the same cable, or
Using the method for respectively using different cables.
Preferably, the current regulation mechanism in the regulation device and the frequency adjustment mechanism carry out control behaviour
Make, comprising:
The current regulation mechanism and the frequency adjustment mechanism take manually control or computer controlled automatic carry out
Control operation.
Preferably, indication mechanism, the current value of each parallel branch of real-time display is set as needed in the regulation device.
As can be seen from the technical scheme provided by the above-mentioned embodiment of the present invention, the embodiment of the present invention constructs direct supercurrent
The circuit model of the multi-parallel superconductive tape of cable, after direct supercurrent cable is powered, each parallel branch, which passes through, to be attached thereto
Current sensor Real-time Feedback DC current signal is to regulation device, and regulation device handles the signal of each branch feedback, according to electricity
The regulation electric current being calculated is delivered to by regulation electric current needed for road model calculates each branch, regulation device by transmission line
Regulation current coupling is carried out resnstance transformer into each branch connected and realizes electric current in each branch by the coupling device of each branch
It evenly distributes.The present invention can be effectively improved the current-carrying equilibrium level between direct supercurrent cable parallel connection superconductive tape, and it is straight to improve superconduction
The reliability of galvanic electricity cable.
The additional aspect of the present invention and advantage will be set forth in part in the description, these will become from the following description
Obviously, or practice through the invention is recognized.
Detailed description of the invention
In order to illustrate the technical solution of the embodiments of the present invention more clearly, required use in being described below to embodiment
Attached drawing be briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention, for this
For the those of ordinary skill of field, without any creative labor, it can also be obtained according to these attached drawings other
Attached drawing.
Fig. 1 is a kind of method stream of the electric current uniform distribution method for direct supercurrent cable provided in an embodiment of the present invention
Cheng Tu；
Fig. 2 is a kind of circuit mould of the electric current uniform distribution method for direct supercurrent cable provided in an embodiment of the present invention
Type figure；
Fig. 3 is a kind of implementation dress of electric current uniform distribution method for direct supercurrent cable provided in an embodiment of the present invention
Set schematic diagram；
Fig. 4 is that a kind of method of electric current uniform distribution method for direct supercurrent cable provided in an embodiment of the present invention is former
Reason figure；
Fig. 5 is a kind of regulation dress of electric current uniform distribution method for direct supercurrent cable provided in an embodiment of the present invention
The structural schematic diagram set.
Specific embodiment
Embodiments of the present invention are described below in detail, the example of the embodiment is shown in the accompanying drawings, wherein from beginning
Same or similar element or element with the same or similar functions are indicated to same or similar label eventually.Below by ginseng
The embodiment for examining attached drawing description is exemplary, and for explaining only the invention, and is not construed as limiting the claims.
Those skilled in the art of the present technique are appreciated that unless expressly stated, singular " one " used herein, " one
It is a ", " described " and "the" may also comprise plural form.It is to be further understood that being arranged used in specification of the invention
Diction " comprising " refer to that there are the feature, integer, step, operation, element and/or component, but it is not excluded that in the presence of or addition
Other one or more features, integer, step, operation, element, component and/or their group.It should be understood that when we claim member
Part is " connected " or when " coupled " to another element, it can be directly connected or coupled to other elements, or there may also be
Intermediary element.In addition, " connection " used herein or " coupling " may include being wirelessly connected or coupling.Wording used herein
"and/or" includes one or more associated any cells for listing item and all combinations.
Those skilled in the art of the present technique are appreciated that unless otherwise defined, all terms used herein (including technology art
Language and scientific term) there is meaning identical with the general understanding of those of ordinary skill in fields of the present invention.Should also
Understand, those terms such as defined in the general dictionary, which should be understood that, to be had and the meaning in the context of the prior art
The consistent meaning of justice, and unless defined as here, it will not be explained in an idealized or overly formal meaning.
In order to facilitate understanding of embodiments of the present invention, it is done by taking several specific embodiments as an example below in conjunction with attached drawing further
Explanation, and each embodiment does not constitute the restriction to the embodiment of the present invention.
Embodiment one
In order in the hyperconductive cable transmission process of more superconductive tape parallel connections, reduce the otherness of each superconductive tape in parallel, have
Effect improves the harmony of superconductive tape current-carrying in parallel, and the embodiment of the present invention is proposed based on fed-back current signals, according to circuit model
Regulation electric current is calculated, the regulation electric current of each branch is adjusted using regulation device, the present invention is supported to the real-time anti-of each branch current
Feedback is adjusted, and realization evenly distributes the electric current of direct supercurrent cable.
The embodiment of the invention provides a kind of method flow diagrams of electric current uniform distribution method for direct supercurrent cable
As shown in Figure 1, including the following steps:
Step S110: the circuit model of the multi-parallel superconductive tape of building direct supercurrent cable establishes number according to circuit model
Equation is learned, implementing device is designed.
Direct supercurrent cable includes more superconductive tapes in parallel, and each superconductive tape constitutes a parallel branch.
The circuit model of the multi-parallel superconductive tape of the direct supercurrent cable of building as shown in Fig. 2, circuit model composition portion
Dividing includes: a current bus bar and multiple parallel branches, and the electric current exported in current bus bar is iAlways, iAlwaysIt is dispersed to each branch in parallel
It is respectively as follows: i behind road1、i2、……、in, each current signal i1、i2、……、inDC current in respectively each parallel branch.
Parallel branch includes: the conventional resistive R that the non-superconductings parts such as contact resistance present in (1) branch are constitutedNi；(2)
The nonlinear resistance R that superconductive part is constitutedHTSi, nonlinear resistance RHTSiIn superconducting state, resistance value 0, with by electric current
Increase, resistance value rises according to an exponential form dependent on N value, and related with by the frequency of electric current；(3) if there is alternation electric
Stream is by branch, then there is also induction reactance L in each branchi；(4) existing mutual inductance M between different parallel branchesij；Wherein, RHTSiWith
By the amplitude and frequency of electric current, there are mapping relations.
According to foregoing circuit model, it is as follows to establish math equation:
Based on each branch equivalent impedance pointed in above-mentioned Physical-Mathematical Model to the dependence by power frequency,
The embodiment of the present invention devises a kind of implementing device of the electric current uniform distribution method of direct supercurrent cable, as shown in figure 3, the reality
Applying device includes: current bus bar, regulation device, tie point, transmission line and each conduction band in parallel.
Wherein, tie point is placed on each conduction band in parallel, including current sensor and coupling device.
Regulation device is attached with each tie point by transmission line.
Transmission line includes two parts: a part is for regulation device conveying regulation electric current to tie point, and a part is for connecting
DC current signal passback is fed back to regulation device by the current sensor of junction.
For the two-part setting method of transmission line: using the method for the different core wires for sharing the same cable, or
Using the method for respectively using different cables.
Step S120: after direct supercurrent cable is powered, it is real-time that each parallel branch passes through the current sensor being attached thereto
DC current signal is fed back to regulation device.
After direct supercurrent cable is powered, DC current is transmitted in each parallel branch by current bus bar, each parallel branch
Upper to have a tie point respectively, current sensor in tie point is used to acquire the DC current signal of place branch, and by institute
The DC current signal of acquisition feeds back to regulation device by transmission line passback.
Step S130: regulation device handles the current signal of each branch acquisition, according to the math equation of circuit model
Regulation electric current needed for calculating each branch.
The structural schematic diagram of regulation device is as shown in figure 5, include current regulation mechanism, frequency adjustment mechanism, feedback control
Unit and output end, the DC current signal that the feedback control unit is acquired and fed back according to each parallel branch, are based on
The math equation of the circuit model calculates the impedance value adjusted needed for each direct current, and then calculates each parallel branch institute
The amplitude and frequency for the regulation electric current that need to be coupled.
Step S140: the regulation electric current being calculated is delivered to the coupling of each branch by regulation device by transmission line
Device.
Regulation device is connected with the tie point of each parallel branch respectively by transmission line, the current regulation in regulation device
Mechanism and frequency adjustment mechanism carry out control operation, by adjusting current regulation mechanism and/or frequency adjustment mechanism, thus it is possible to vary
The amplitude and frequency of the regulation electric current of output end, and the regulation electric current that will have adjusted amplitude and frequency, are connected by output end
Connect the coupling device that transmission line is applied to corresponding parallel branch.
Different output ends in regulation device are independent from each other, to realize to the fine separately adjustable of different branch,
The different regulation electric currents of output are also independent from each other, to realize the corresponding adjusting to different branch.
As needed, the side manually controlled can be used when current regulation mechanism and frequency adjustment mechanism carry out control operation
Formula, can also be by the way of computer controlled automatic.Indication mechanism, each parallel branch of real-time display can be set in regulation device
DC current values.
Those skilled in the art will be understood that above-mentioned lifted utilization current regulation mechanism and frequency adjustment mechanism to regulation
The technical solution of the embodiment of the present invention is only better described in electric current progress amplitude and the mode of frequency shift, rather than to the present invention
The restriction that embodiment is made.The mode of any amplitude for changing regulation electric current and frequency, is all contained in the model of the embodiment of the present invention
In enclosing.
Step S150: regulation current coupling carries out resnstance transformer into each branch connected and realizes that electric current evenly distributes.
The method schematic evenly distributed at each tie point to the electric current in branch is as shown in figure 4, in tie point
Place, current sensor 46 acquire the DC current signal i from current bus bark, and by signal ikIt is returned instead through transmission line 45
It feeds regulation device；Coupling device 43 will be from the DC current i of current bus barkIt is passed with from regulation device through transmission line 42
The defeated regulation electric current i to comemk(t) it is coupled, in this way, flowing into the DC current i of each superconduction parallel branch through current bus barkThrough
Pass through electric current i ' as the reality of each branch after couplingk。
It can be seen that existing in different parallel branches in circuit model: (1) contact resistance present in branch etc. is non-super
Lead the conventional resistive R of part compositionNi；(2) the nonlinear resistance R that superconductive part is constitutedHTSi, nonlinear resistance RHTSiIn superconduction shape
When state, resistance value 0, with the increase by electric current, resistance value rises according to an exponential form dependent on N value；(3) if there is friendship
Time-dependent current is by branch, then there is also induction reactance L in each branchi；(4) existing mutual inductance M between different parallel branchesij；Due to this
The presence of a little resistance, inductance, the DC current distribution of each parallel branch are simultaneously uneven.
It will be according to the calculated regulation current transmission of circuit model to the DC current in coupling device and each parallel branch
After being coupled, mutually independent regulation electric current, which can exchange different branch, induces a corresponding compensation resistance, right
Different parallel branches carries out corresponding resnstance transformer, so that the resistance in different parallel branches is identical.By corresponding resistance
After compensation, the reality that different parallel branches finally couple passes through electric current i 'kIt is evenly distributed, so far, the method achieve right
The electric current of different parallel branches evenly distributes.
Hereafter, regulation device acquires the DC current in each parallel branch in real time, carries out according to above-mentioned steps each in real time
Branch regulates and controls electric current output and adjusts, and achievees the purpose that the electric current of each parallel branch evenly distributes.
Embodiment two
The embodiment of the invention provides a kind of electric current uniform distribution methods for direct supercurrent cable, as shown in figure 3, packet
It includes regulation device 1, regulation device 1 to connect through transmission line 5 with the tie point 4 of the superconductive tape 3 of direct supercurrent cable, superconductor
The current bus bar 2 of (such as copper) superconductive tape 3 in parallel with more is by being welded to connect, welding of the tie point 4 close to current bus bar 2
Point.
As shown in figure 4, each superconductive tape constitutes a so-called parallel branch.Regulate and control the coupled device 43 of electric current 42 with
Superconduction band connection.In this way, becoming the reality of each branch after the electric current 41 for flowing into each superconduction parallel branch through current bus bar is coupled
Pass through electric current 44.
As shown in figure 4, tie point 4 contains current sensor 46 simultaneously, the electricity of each branch outflow current bus bar is acquired in real time
Stream 41.Regulation device 1 is recycled to through connecting line 45.45 and 42 together constitute transmission line 5, they can share the same cable
Different core wires, can also respectively use different cables.
As shown in figure 5, regulation device 1 includes current regulation mechanism 11, frequency adjustment mechanism 12 and feedback control unit 13.
Current regulation mechanism 11 and frequency adjustment mechanism 12 can be manually, be also possible to computer controlled automatic.Feedback control
Unit calculates the amplitude and frequency of the regulation electric current coupled needed for each branch, leads to according to the collected current signal of each branch
Cross the coupling device that output end is applied to respective branch.As needed, indication mechanism can be set in regulation device, and real-time display is each
The current value of parallel branch.
The operation principle of the present invention is that: after direct supercurrent cable is powered, each parallel branch passes through the electric current being attached thereto and passes
Sensor loopback DC current, regulation device handle the DC current signal of each branch acquisition, are calculated according to circuit model each straight
The impedance value adjusted needed for stream, and then calculate the amplitude and frequency for regulating and controlling electric current needed for each branch.Next, calculate
The regulation electric current of each branch send the reality for being coupled to each branch to the coupling device of each branch to pass through in electric current by transmission line.
Hereafter, regulation device acquires the DC current of each branch in real time, and it is defeated to carry out each branch regulation electric current in real time according to the method described above
It adjusts out, achievees the purpose that the electric current of each branch evenly distributes.
In conclusion circuit model of the embodiment of the present invention by the multi-parallel superconductive tape of building direct supercurrent cable,
After direct supercurrent cable is powered, each parallel branch pass through the current sensor Real-time Feedback DC current signal that is attached thereto to
Regulation device calculates each branch institute according to circuit model after regulation device gets the DC current signal of each branch feedback
The regulation electric current being calculated is delivered to the coupling device of each branch, coupling by the regulation electric current needed, regulation device by transmission line
It attaches together to set and regulation current coupling is subjected to evenly distributing for resnstance transformer realization electric current into each branch connected.Tune of the present invention
Control device acquires each branch current in real time, carries out Real-time Feedback output to each branch and adjusts, realizes to direct supercurrent cable
Electric current evenly distributes, the current-carrying equilibrium level that can be effectively improved between direct supercurrent cable parallel connection superconductive tape, improves direct supercurrent
The reliability of cable, and the present invention is placed in outside low temperature environment the regulating mechanism of each superconduction branch in parallel, it is easy to accomplish, it is convenient for
Operation.
Those of ordinary skill in the art will appreciate that: attached drawing is the schematic diagram of one embodiment, module in attached drawing or
Process is not necessarily implemented necessary to the present invention.
As seen through the above description of the embodiments, those skilled in the art can be understood that the present invention can
It realizes by means of software and necessary general hardware platform.Based on this understanding, technical solution of the present invention essence
On in other words the part that contributes to existing technology can be embodied in the form of software products, the computer software product
It can store in storage medium, such as ROM/RAM, magnetic disk, CD, including some instructions are used so that a computer equipment
(can be personal computer, server or the network equipment etc.) executes the certain of each embodiment or embodiment of the invention
Method described in part.
All the embodiments in this specification are described in a progressive manner, same and similar portion between each embodiment
Dividing may refer to each other, and each embodiment focuses on the differences from other embodiments.Especially for device or
For system embodiment, since it is substantially similar to the method embodiment, so describing fairly simple, related place is referring to method
The part of embodiment illustrates.Apparatus and system embodiment described above is only schematical, wherein the conduct
The unit of separate part description may or may not be physically separated, component shown as a unit can be or
Person may not be physical unit, it can and it is in one place, or may be distributed over multiple network units.It can root
According to actual need that some or all of the modules therein is selected to achieve the purpose of the solution of this embodiment.Ordinary skill
Personnel can understand and implement without creative efforts.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
In the technical scope disclosed by the present invention, any changes or substitutions that can be easily thought of by anyone skilled in the art,
It should be covered by the protection scope of the present invention.Therefore, protection scope of the present invention should be with scope of protection of the claims
Subject to.
Claims (10)
1. a kind of electric current uniform distribution method for direct supercurrent cable characterized by comprising
The circuit model for constructing the multi-parallel superconductive tape of direct supercurrent cable, establishes math equation according to the circuit model, if
The implementing device of electric current uniform distribution method is counted, which mainly includes regulation device and coupling device；
After the current bus bar of direct supercurrent cable is powered, each parallel branch passes through the current sense in the tie point being attached thereto
Device Real-time Feedback DC current signal is to regulation device, and the regulation device is based on the DC current signal, according to the electricity
Regulation electric current needed for the math equation of road model calculates each branch；
The regulation electric current being calculated is delivered to the coupling in each branch tie point by the regulation device by transmission line
The regulation current coupling is carried out resnstance transformer into each branch connected and realizes electricity in each branch by device, the coupling device
Stream evenly distributes.
2. the electric current uniform distribution method according to claim 1 for direct supercurrent cable, which is characterized in that described
The circuit model for constructing the multi-parallel superconductive tape of direct supercurrent cable, establishes math equation according to the circuit model, comprising:
The direct supercurrent cable includes more superconductive tapes in parallel, and each superconductive tape constitutes the branch in parallel
Road；
The circuit model includes: a current bus bar and multiple parallel branches, wherein the composition of the parallel branch includes: non-
The conventional resistive R that superconductive part is constitutedNi, the nonlinear resistance R of superconductive part compositionHTSi, alternating current passes through each parallel branch
The induction reactance L of generationi, existing mutual inductance M between different parallel branchesij, wherein RHTSiWith the amplitude and frequency presence by electric current
Mapping relations；
According to the circuit model, founding mathematical models are as follows:
3. the electric current uniform distribution method according to claim 1 for direct supercurrent cable, which is characterized in that described
The implementing device that design current evenly distributes, comprising:
The implementing device includes: current bus bar, regulation device, tie point, transmission line and each conduction band in parallel；
The tie point is placed on each conduction band in parallel, including current sensor and coupling device；
The regulation device is connected with the tie point of each parallel branch respectively by transmission line；
The transmission line includes two parts: a part is for regulation device conveying regulation electric current to tie point, and a part is for connecting
DC current signal is passed back to the regulation device by the current sensor of junction.
4. the electric current uniform distribution method according to claim 1 for direct supercurrent cable, which is characterized in that described
After the current bus bar of direct supercurrent cable is powered, each parallel branch passes through the current sense in the tie point being attached thereto
Device Real-time Feedback DC current signal is to regulation device, comprising:
There is a tie point in each parallel branch respectively, the current sensor in the tie point is for acquiring in each branch
From current bus bar flow out DC current signal, and by DC current signal collected by transmission line passback feed back to described in
Regulation device.
5. the electric current uniform distribution method according to claim 1 for direct supercurrent cable, which is characterized in that described
Regulation device is based on the DC current signal, needed for calculating each branch according to the math equation of the circuit model
Regulate and control electric current, comprising:
The regulation device includes current regulation mechanism, frequency adjustment mechanism, feedback control unit and output end, the feedback control
The current signal that unit processed is acquired and fed back according to each parallel branch, based on the math equation of the circuit model
Calculate the amplitude and frequency of the regulation electric current coupled needed for each parallel branch.
6. the electric current uniform distribution method according to claim 5 for direct supercurrent cable, which is characterized in that described
The regulation electric current being calculated is delivered to the coupling device in each branch tie point by transmission line by regulation device, packet
It includes:
The current regulation mechanism and the frequency adjustment mechanism in the regulation device carry out control operation, adjust the tune
The amplitude and frequency for controlling electric current, after being consistent with the regulation electric current being calculated for regulation current regulation, by the regulation
Electric current connects the coupling device that the transmission line is applied to corresponding parallel branch by output end；
The different output ends of the regulation device are mutually indepedent, and the regulation electric current of different output end outputs is mutually indepedent.
7. the electric current uniform distribution method according to claim 1 for direct supercurrent cable, which is characterized in that described
The regulation current coupling is carried out resnstance transformer into each branch connected and realizes that electric current is uniform in each branch by coupling device
Distribution, comprising:
It is separately adjustable to different branch progress that the mutually independent regulation electric current is exported in the regulation device, it is mutually independent
The regulation coupling device of the electric current through the tie point is connect with each parallel branch, and the current bus bar flows into each parallel branch
DC current couple with the regulation electric current through the coupling device after become the reality of each parallel branch by electric current, difference
Branch is by actually passing through balanced current distribution after regulating and controlling the coupling of electric current.
8. the electric current uniform distribution method according to claim 3 for direct supercurrent cable, which is characterized in that described
Transmission line includes two parts: a part is for regulation device conveying regulation electric current to tie point, and a part is at tie point
DC current signal is passed back to the regulation device by the current sensor, comprising:
The two-part setting method of the transmission line: it using the method for the different core wires for sharing the same cable, or uses
Respectively use the method for different cables.
9. the electric current uniform distribution method according to claim 6 for direct supercurrent cable, which is characterized in that described
The current regulation mechanism and the frequency adjustment mechanism in regulation device carry out control operation, comprising:
The current regulation mechanism and the frequency adjustment mechanism, which are taken, to be manually controlled or computer controlled automatic is controlled
Operation.
10. the electric current uniform distribution method according to claim 1 for direct supercurrent cable, which is characterized in that described
Regulation device indication mechanism, the current value of each parallel branch of real-time display is set as needed.
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| CN111830328B (en) * | 2020-08-04 | 2022-04-01 | 清华四川能源互联网研究院 | Parameter determination method, parameter determination device and direct current parallel cable |
| CN112069733B (en) * | 2020-09-03 | 2024-04-19 | 中国科学院电工研究所 | Current equalization optimization method and system for high-temperature superconductive direct-current cable for energy pipeline |
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