CN104201661A - Novel saturated iron core type high-temperature superconductor current limiter - Google Patents
Novel saturated iron core type high-temperature superconductor current limiter Download PDFInfo
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- CN104201661A CN104201661A CN201410471137.5A CN201410471137A CN104201661A CN 104201661 A CN104201661 A CN 104201661A CN 201410471137 A CN201410471137 A CN 201410471137A CN 104201661 A CN104201661 A CN 104201661A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- 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
- Y02E40/40—Arrangements for reducing harmonics
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- 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
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Abstract
The invention discloses a novel saturated iron core type high-temperature superconductor current limiter which comprises two iron cores. Each iron core is provided with an alternating-current superconductor winding and a direct-current superconductor winding, the alternating-current superconductor winding and the direct-current superconductor winding on one of the iron cores are identical in winding direction, and the alternating-current superconductor winding and the direct-current superconductor winding on the other iron core are opposite in winding direction. The superconductor current limiter comprises two loops, a direct-current loop is sequentially connected with an IGBT1 (insulated gate bipolar transistor 1) parallel direct-current constant-current source I0, a resistor R1 and the two direct-current superconductor windings, and an alternating-current loop is sequentially connected with an IGBT2 parallel current limiting resistor R0, an alternating-current power source US, a power switch S1, a load resistor RL, a resistor R2 and the two alternating-current superconductor windings. The novel saturated iron core type high-temperature superconductor current limiter has the advantages that when a peak value and a steady-state value of a fault current can be both limited in short-circuit faults of the power grid, and current limiting effects are pretty evident; experiments show that the novel saturated iron core type high-temperature superconductor current limiter is further capable of inhibiting harmonic waves and reducing line current waveform deviation factors under normal conditions to develop a new way to eliminate grid harmonic waves.
Description
Technical field
The present invention relates to a kind of fault current limiter, particularly a kind of novel saturable core high temperature superconducting malfunction current limiter.
Background technology
Expanding day along with the scale of electrical network, under extra high voltage system failure condition, can produce very large fault current, existing primary cut-out is difficult to excise short-circuit current, in order to reduce fault current, many current limiters have been there is, for example power electronics flow restricter, reactance current limiter and split reactor etc., comparatively ideal is superconductive current limiter.
Basic saturable core type high tc superconducting fault current limiter structure chart is as Fig. 1, and its DC superconducting coil produces very strong D.C. magnetic field, makes iron core in degree of depth magnetic saturation state.During normal work, the magnetic field that specified alternating current produces, deficiency is so that iron core departs from saturation region, make coil in electrical network in low induction reactance state.When there is short trouble, the magnetomotive force that large electric current produces reaches the flux value that superconducting coil produces, the reverse iron core of direct current flux and exchange flux direction departs from saturation condition, in AC coil, cause the variation of magnetic flux, produce high induction reactance, thereby limiting short-circuit current, and identical another iron core of flow direction is still in saturation condition, impedance is still very little.Adopting two groups of iron cores is that this flow restricter is in short-circuit condition in order to distinguish limiting short-circuit current in positive-negative half-cycle, although externally present high impedance, superconductor is quench not, and therefore, the problem that does not exist quench to recover, is conducive to realize circuit re-switching.The defect of this fault current limiter is: 1) winding of basic saturable core type high tc superconducting fault current limiter is copper winding, and it can exist electric energy loss and voltage loss.2) direct current in basic saturable core type high tc superconducting fault current limiter DC loop can reduce the limitation capability of short circuit current when short trouble.
Summary of the invention
The technical problem existing in order to solve existing basic saturable core type high temperature superconducting malfunction current limiter, the present invention propose a kind of simple in structure, can the peak value of fault current limiting and the novel saturable core high temperature superconducting malfunction current limiter of steady-state value.And in experiment, find that saturable core type high tc superconducting fault current limiter can also suppress harmonic wave, and reduce normal condition AC current waveform aberration rate, for eliminating mains by harmonics, open up new footpath.
The technical scheme that the present invention solves the problems of the technologies described above is: comprise two iron cores, on each iron core, there are an AC superconduction winding and a DC superconducting winding, AC superconduction winding on one of them iron core and DC superconducting winding are around to identical, contrary on another iron core, two AC superconduction windings are serially connected in transmission line, DC superconducting winding, for generation of a very strong D.C. magnetic field, makes the iron core degree of depth saturated.Superconductive current limiter comprises two loops, meets successively IGBT in DC loop
1parallel connection direct constant-current source I
0, resistance R
1with two DC superconducting windings.Ac circuit meets IGBT successively
2and current-limiting resistance R
0, AC power U
s, mains switch S
1, load resistance R
l, resistance R
2with two AC superconduction windings.
Technique effect of the present invention is: 1) the former secondary of flow restricter all adopts superconduction winding, in normal operation, at former secondary winding, can not produce electric energy loss and voltage loss.2), when short trouble, by IGBT, disconnect fast direct current and improve current limiting capacity.3) at ac circuit, seal in current-limiting resistance R
0, further improved its current limiting capacity.4) because short trouble energy mainly consumes in current-limiting resistance, rather than consume on superconduction inductance, thereby greatly reduce power rank and the operating cost of cryogenic system.5) saturable core type high tc superconducting fault current limiter can also suppress harmonic wave, reduces normal condition AC current waveform aberration rate, for eliminating mains by harmonics, opens up new footpath.
Below in conjunction with accompanying drawing, the present invention is further illustrated.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of basic saturable core type high temperature superconducting malfunction current limiter.
Fig. 2 is schematic diagram of the present invention.
Fig. 3 normal condition and short-circuit conditions line current i and bias current I
0relation.
Fig. 4 normal condition and short-circuit conditions flow restricter voltage U
abwith bias current electric current I
0relation.
Fig. 5 is the percent harmonic distortion of line current waveform and line current thereof under normal circumstances.
The former limit isoboles of Fig. 6 saturable core flow restricter.
Embodiment
Referring to Fig. 2, Fig. 2 is schematic diagram of the present invention.In the present invention, superconductive current limiter comprises two loops, meets successively IGBT in DC loop
1parallel connection direct constant-current source I
0, resistance R
1with two DC superconducting windings.Ac circuit meets IGBT successively
2and current-limiting resistance R
0, AC power Us, mains switch S
1, load resistance R
l, resistance R
2with two AC superconduction windings.IGBT
1and IGBT
2operate time lower than 100 μ s, all meet the requirement of electric power system reclosing, and increased current-limiting resistance R
0, for failure current limit.
The operation principle of novel saturable core high temperature superconducting malfunction current limiter: in normal operation, two IGBT are in closure state, current-limiting resistance R
0by short circuit, operating state is very similar to basic saturable core type superconductive current limiter, the AC magnetic field deficiency that AC coil produces is so that iron core departs from saturation region, magnetic induction density B in iron core is constant, the magnetic flux Φ that exchanges winding institute interlinkage is constant, and the induced electromotive force that exchanges winding two ends is zero, and the former secondary winding of novel saturable core high tc superconducting fault current limiter is superconduction winding, there is not electric energy loss and voltage loss, in normal operation, do not occur current limliting phenomenon yet.When there is short trouble, the magnetic flux that large ac short circuit electric current produces meets or exceeds the flux value that DC superconducting coil produces, the reverse iron core of direct current flux and exchange flux direction departs from saturation condition, in AC coil, cause the variation of magnetic flux, produce high induction reactance, thereby limiting short-circuit current, and identical another iron core of flow direction is still in saturation condition, impedance is still very little.Adopting two groups of iron cores is in order to distinguish limiting short-circuit current in positive-negative half-cycle.IGBT
1detect after the ac short circuit electric current of unexpected increase, closed after the time in μ S level, thus short circuit DC bias current improves its current limiting capacity.IGBT
2also after the ac short circuit electric current of unexpected increase being detected, in μ S level, after the time, disconnect, make current-limiting resistance R
0seal in current limliting, further improve its current limiting capacity, short trouble energy is mainly consumed at current-limiting resistance R
0upper, rather than consume on superconduction inductance, greatly reduce the loss of cryogenic system.This flow restricter, in short-circuit condition, although externally present high impedance, superconductor is quench not, and therefore, the problem that does not exist quench to recover, has high-speed reclosure function.
Normal operating conditions, the structure of saturable core type high tc superconducting fault current limiter is equivalent to an air-core transformer, can obtain its former limit equivalent electric circuit as shown in Figure 6.Secondary loop self-impedance Z
22calculation expression: Z
22=R+j ω L
2, R wherein
2for the resistance of secondary superconduction winding, because of superconduction winding quench not, its resistance is 0, L
2inductance for secondary superconduction winding.Loop, former limit self-impedance Z
11calculation expression: Z
11=R
2+ R
l+ j ω L
1, L
1be the inductance of a superconduction winding, R
1be the resistance of a superconduction winding, its resistance is 0, R
lfor load resistance, the calculating formula of the impedance of primary circuit is: Z
1=Z
11+ (ω M)
2/ Z
22, visible saturable core type superconductive current limiter is equivalent to an inductance, thereby the harmonic wave of electric power system is had to inhibitory action, when direct current increase makes core sataration, and the inductance inductance L of former secondary superconduction winding
1, L
2level off to 0, the mutual inductance M of former secondary superconduction winding also convergence is 0, makes the introducing impedance (ω M) of primary circuit
2/ Z
22also convergence is 0, thereby the inhibitory action of the harmonic wave of electric power system is reduced; But when frequencies omega increases, introduce impedance (ω M)
2/ Z
22increase, thereby flow restricter has good inhibitory action to high-frequency current, saturable core type HTSCFCL has the function that suppresses high order harmonic component, and can reduce line current waveform harmonics aberration rate.Because all there is not resistance in the former secondary of novel saturable core superconductive current limiter, thereby there is not electric energy loss, but can there is voltage loss, can the voltage of power end suitably be heightened with voltage regulating mode, then by the direct current short circuit of superconductive current limiter, now novel saturable core superconductive current limiter just can both can be used as superconductive current limiter, can be used as again Harmonious Waves in Power Systems inhibitor.
Claims (1)
1. a novel saturable core high tc superconducting fault current limiter comprises two iron cores, on each iron core, there are an AC superconduction winding and a DC superconducting winding, AC superconduction winding on one of them iron core and DC superconducting winding be around to identical, contrary on another iron core.Superconductive current limiter comprises two loops, meets successively IGBT in DC loop
1parallel connection direct constant-current source I
0, resistance R
1with two DC superconducting windings.Ac circuit meets IGBT successively
2and current-limiting resistance R
0, AC power U
s, mains switch S
1, load resistance R
l, resistance R
2with two AC superconduction windings.
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| CN201410471137.5A CN104201661A (en) | 2014-09-16 | 2014-09-16 | Novel saturated iron core type high-temperature superconductor current limiter |
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|---|---|---|---|
| CN201410471137.5A CN104201661A (en) | 2014-09-16 | 2014-09-16 | Novel saturated iron core type high-temperature superconductor current limiter |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105896549A (en) * | 2016-04-06 | 2016-08-24 | 中国能源建设集团广东省电力设计研究院有限公司 | 500 kV power transmission line current limiting device |
| CN106602566A (en) * | 2017-03-07 | 2017-04-26 | 四川师范大学 | Superconductive AC-DC customized electric power system having high power supply quality |
| CN111276951A (en) * | 2020-03-11 | 2020-06-12 | 广东电网有限责任公司电力科学研究院 | Direct current protection method, system and equipment based on superconducting current limiter |
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| CN102025138A (en) * | 2009-09-15 | 2011-04-20 | 北京云电英纳超导电缆有限公司 | Parallel superconducting fault current limiter |
| CN102064542A (en) * | 2010-12-14 | 2011-05-18 | 东南大学 | Impedance composite superconducting fault current limiter based on novel superconducting material |
| CN102882200A (en) * | 2012-10-31 | 2013-01-16 | 东南大学 | Bridge type fault current limiter with current balancing effect |
| CN103324808A (en) * | 2013-07-06 | 2013-09-25 | 云南电力试验研究院（集团）有限公司电力研究院 | PSCAD (power system computer aided design) model of superconductive current-limiting reactor |
| CN103872672A (en) * | 2014-03-05 | 2014-06-18 | 湖南大学 | Novel saturated iron core high-temperature superconductive current limiter served as harmonic suppressor |
-
2014
- 2014-09-16 CN CN201410471137.5A patent/CN104201661A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102025138A (en) * | 2009-09-15 | 2011-04-20 | 北京云电英纳超导电缆有限公司 | Parallel superconducting fault current limiter |
| CN102064542A (en) * | 2010-12-14 | 2011-05-18 | 东南大学 | Impedance composite superconducting fault current limiter based on novel superconducting material |
| CN102882200A (en) * | 2012-10-31 | 2013-01-16 | 东南大学 | Bridge type fault current limiter with current balancing effect |
| CN103324808A (en) * | 2013-07-06 | 2013-09-25 | 云南电力试验研究院（集团）有限公司电力研究院 | PSCAD (power system computer aided design) model of superconductive current-limiting reactor |
| CN103872672A (en) * | 2014-03-05 | 2014-06-18 | 湖南大学 | Novel saturated iron core high-temperature superconductive current limiter served as harmonic suppressor |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105896549A (en) * | 2016-04-06 | 2016-08-24 | 中国能源建设集团广东省电力设计研究院有限公司 | 500 kV power transmission line current limiting device |
| CN106602566A (en) * | 2017-03-07 | 2017-04-26 | 四川师范大学 | Superconductive AC-DC customized electric power system having high power supply quality |
| CN106602566B (en) * | 2017-03-07 | 2019-01-29 | 四川师范大学 | A kind of superconduction alternating current-direct current custom power system |
| CN111276951A (en) * | 2020-03-11 | 2020-06-12 | 广东电网有限责任公司电力科学研究院 | Direct current protection method, system and equipment based on superconducting current limiter |
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Application publication date: 20141210 |