CN103872672A - Novel saturated iron core high-temperature superconductive current limiter served as harmonic suppressor - Google Patents

Novel saturated iron core high-temperature superconductive current limiter served as harmonic suppressor Download PDF

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Publication number
CN103872672A
CN103872672A CN201410077872.8A CN201410077872A CN103872672A CN 103872672 A CN103872672 A CN 103872672A CN 201410077872 A CN201410077872 A CN 201410077872A CN 103872672 A CN103872672 A CN 103872672A
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China
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current
superconductive
winding
iron core
current limiter
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CN201410077872.8A
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Chinese (zh)
Inventor
张晚英
胡雪峰
周辉
佘旺
刘东辉
黄守道
王耀南
黎福海
罗安
李欣然
方厚辉
江亚群
荣飞
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Hunan University
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Hunan University
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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
    • 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

Abstract

The invention discloses a novel saturated iron core high-temperature superconductive current limiter served as a harmonic suppressor. The novel saturated iron core high-temperature superconductive current limiter comprises two iron cores, wherein an alternating current superconductive winding and a direct current superconductive winding are arranged on each of the iron cores; the alternating current superconductive winding and the direct current superconductive winding on one of the iron cores are the same in winding direction; the alternating current superconductive winding and the direct current superconductive winding on the other iron core are opposite in winding directions; the superconductive current limiter comprises two circuits; an IGBT1 (Insulated Gate Bipolar Transistor 1), a direct current constant flow source I0, a resistor R1 and two direct current superconductive windings are connected on a direct current circuit in turn; an IGBT2 (Insulated Gate Bipolar Transistor 2), a current limiting resistor R0, an alternating current power supply US, a power switch S1, a load resistor RL, a resistor R2 and two alternating current superconductive windings are connected on an alternating current circuit. When a power grid is in short-circuited fault, the peak value and the steady-state value of fault current can be limited by the novel saturated iron core high-temperature superconductive current limiter; the current-limiting effect is obvious; a test proves that the saturated iron core high-temperature superconductive current limiter also can suppress harmonic wave and can reduce an alternating current waveform distortion factor under a normal condition; a new method for eliminating the harmonic wave of the power grid is developed.

Description

Novel saturable core high tc superconducting fault current limiter also can be used as harmonic shutter
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 can be used as Harmonious Waves in Power Systems inhibitor.
Background technology
Along with the expanding day of 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 are 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.When 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.In the time 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 in the time of 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, open up new footpath for eliminating mains by harmonics.
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 1, DC constant current power supply 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, can not produce electric energy loss and voltage loss at former secondary winding.2), in the time of short trouble, disconnect fast direct current by IGBT and improve current limiting capacity.3) seal in current-limiting resistance R at ac circuit 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, opens up new footpath for eliminating mains by harmonics.
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 line current waveform and harmonic analysis 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 1, DC constant current power supply 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.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, do not occur current limliting phenomenon in normal operation yet.In the time 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, after the μ S level time, disconnect, thereby disconnect DC bias current, improve its current limiting capacity.IGBT 2also detecting after the ac short circuit electric current of unexpected increase, after the μ S level 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, wherein R 2for the resistance of superconduction winding, because of not quench of superconduction winding, its resistance is 0, L 2for the inductance of 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, inductance levels off to 0, the inhibitory action of the harmonic wave to electric power system reduces, if when electric power system higher harmonic content is larger, 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 the direct current of superconductive current limiter is disconnected, now novel saturable core superconductive current limiter just can be both 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 can be used as harmonic shutter, 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 be around to identical, contrary on another iron core.Superconductive current limiter comprises two loops, meets successively IGBT in DC loop 1, DC constant current power supply 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.
CN201410077872.8A 2014-03-05 2014-03-05 Novel saturated iron core high-temperature superconductive current limiter served as harmonic suppressor Pending CN103872672A (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104201661A (en) * 2014-09-16 2014-12-10 湖南大学 Novel saturated iron core type high-temperature superconductor current limiter
CN104253424A (en) * 2014-10-20 2014-12-31 湖南大学 Novel saturated iron core high temperature superconducting fault current limiter capable of serving as harmonic suppressor
CN104332978A (en) * 2014-11-12 2015-02-04 湖南大学 Improved saturated core high-temperature superconducting current limiter
CN110098634A (en) * 2019-02-25 2019-08-06 上海电机学院 A kind of wind-electricity integration system with superconductive current limiter
WO2019158180A1 (en) * 2018-02-13 2019-08-22 Siemens Aktiengesellschaft Device for limiting electrical current
CN111384709A (en) * 2020-03-09 2020-07-07 中国科学院电工研究所 High-voltage high-capacity split reactance type current limiter

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1870380A (en) * 2006-05-16 2006-11-29 中国科学院电工研究所 Short-circuit fault current limitter
US20070230076A1 (en) * 2006-03-29 2007-10-04 Husband Stephen M Fault current limiting
CN102306933A (en) * 2011-09-13 2012-01-04 山东大学 Short-circuit current limiter with high reliability and method thereof
CN102684179A (en) * 2012-05-10 2012-09-19 中国科学院电工研究所 Hybrid short-circuit failure current limiter

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070230076A1 (en) * 2006-03-29 2007-10-04 Husband Stephen M Fault current limiting
CN1870380A (en) * 2006-05-16 2006-11-29 中国科学院电工研究所 Short-circuit fault current limitter
CN102306933A (en) * 2011-09-13 2012-01-04 山东大学 Short-circuit current limiter with high reliability and method thereof
CN102684179A (en) * 2012-05-10 2012-09-19 中国科学院电工研究所 Hybrid short-circuit failure current limiter

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104201661A (en) * 2014-09-16 2014-12-10 湖南大学 Novel saturated iron core type high-temperature superconductor current limiter
CN104253424A (en) * 2014-10-20 2014-12-31 湖南大学 Novel saturated iron core high temperature superconducting fault current limiter capable of serving as harmonic suppressor
CN104332978A (en) * 2014-11-12 2015-02-04 湖南大学 Improved saturated core high-temperature superconducting current limiter
WO2019158180A1 (en) * 2018-02-13 2019-08-22 Siemens Aktiengesellschaft Device for limiting electrical current
CN110098634A (en) * 2019-02-25 2019-08-06 上海电机学院 A kind of wind-electricity integration system with superconductive current limiter
CN111384709A (en) * 2020-03-09 2020-07-07 中国科学院电工研究所 High-voltage high-capacity split reactance type current limiter

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Application publication date: 20140618