CN107769179A - It is a kind of based on can shut-off valve force electric current transfevent blended learning - Google Patents

It is a kind of based on can shut-off valve force electric current transfevent blended learning Download PDF

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Publication number
CN107769179A
CN107769179A CN201610705506.1A CN201610705506A CN107769179A CN 107769179 A CN107769179 A CN 107769179A CN 201610705506 A CN201610705506 A CN 201610705506A CN 107769179 A CN107769179 A CN 107769179A
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CN
China
Prior art keywords
branch road
current
shut
stable state
blended learning
Prior art date
Application number
CN201610705506.1A
Other languages
Chinese (zh)
Inventor
魏晓光
汤广福
贺之渊
陈龙龙
赵岩
张升
高阳
杨兵建
Original Assignee
全球能源互联网研究院
国家电网公司
国网浙江省电力公司
Priority date (The priority date 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 date listed.)
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Application filed by 全球能源互联网研究院, 国家电网公司, 国网浙江省电力公司 filed Critical 全球能源互联网研究院
Priority to CN201610705506.1A priority Critical patent/CN107769179A/en
Publication of CN107769179A publication Critical patent/CN107769179A/en

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Classifications

    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02HEMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H9/00Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
    • H02H9/02Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02HEMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H9/00Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
    • H02H9/02Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
    • H02H9/021Current limitation using saturable reactors
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02HEMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H9/00Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
    • H02H9/02Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
    • H02H9/028Current limitation by detuning a series resonant circuit
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02HEMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H9/00Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
    • H02H9/04Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
    • H02H9/06Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage using spark-gap arresters

Abstract

The invention provides it is a kind of based on can shut-off valve force electric current transfevent blended learning, including current limliting branch road in parallel respectively, stable state is through-flow branch road, arc current processing branch road and arrester branch road;Current limliting branch road includes the current-limiting resistance and reactor of series connection;Stable state is through-flow, and branch road includes ultrahigh speed mechanical switch, for transmitting load current and transfer fault current;Arc current processing branch road includes full-bridge circuit, for aiding in the through-flow branch road transfer fault current of stable state.Compared with prior art, it is provided by the invention it is a kind of based on can shut-off valve force electric current transfevent blended learning, pass through arc current when power system is broken down and handle the through-flow branch road of Zhi Luxiang stable states and inject reverse current so that stable state is through-flow branch road do not influenceed by arc voltage being capable of reliable disjunction.

Description

It is a kind of based on can shut-off valve force electric current transfevent blended learning
Technical field
The present invention relates to AC-HVDC and electric and electronic technical field, and in particular to it is a kind of based on can shut-off valve force Electric current transfevent blended learning.
Background technology
Caused fault current can cause greatly rush of current to the normal operation of power equipment after electric power system fault, So that power equipment bears larger thermal stress and electric power, and produce on the induction equipment of power system higher excessively electric Pressure.Meanwhile fault current can propose high technical requirements, such as the electric current such as dc circuit breaker to the development of electric current disjunction equipment Disjunction equipment.
Demand limiter is installed typically in power system at present and plays the purpose for reducing fault current.Traditional failure electricity It is mainly superconductive current limiter to flow limiter, but because superconductor needs just work under extremely low temperature, power system is just Steady-state current in normal running can produce larger thermal losses on superconductor, easily cause superconduction and quench phenomenon, because This needs to carry out sub-cooled to it, and which in turn reduces the reliability of superconductive current limiter.
Document《Power system fault current limiter Review Study》A kind of arc current transfevent current limiter proposed, not Using superconductor but the technical scheme transfer fault current of vacuum switch combination discharging gap arc voltage control is used, gram The defects of having taken superconductor thermal losses and low reliability, but this transferable electric current of arc current transfevent current limiter by To having a great influence for arc voltage and lead stray inductance, when arc voltage is very low, fault current is difficult to be transferred.
The content of the invention
The defects of in order to overcome prior art, the invention provides it is a kind of based on can shut-off valve force the electric current transfevent to mix Box-like current limiter.
The technical scheme is that:
The blended learning includes current limliting branch road in parallel respectively, stable state is through-flow branch road, arc current processing branch road With arrester branch road;
The current limliting branch road includes the current-limiting resistance and reactor of series connection;
The through-flow branch road of stable state includes ultrahigh speed mechanical switch, for transmitting load current and transfer fault current;
The arc current processing branch road includes full-bridge circuit, for aiding in the through-flow branch road transfer failure electricity of the stable state Stream.
The present invention further provides optimal technical scheme be:Tie point of the full-bridge circuit including difference parallel connection, Second branch road and the 3rd branch road;
What the tie point included connecting turns off valve cell and diode, and second branch road includes the resonance of series connection Inductance and capacitor;What the 3rd branch road included connecting turns off valve cell and diode;
One end of the through-flow branch road of stable state is connected in the tie point and can turned off between valve cell and diode, separately One end is connected in second branch road and can turned off between valve cell and diode.
The present invention further provides optimal technical scheme be:
The positive pole of the capacitor is connected with resonant inductance, negative pole respectively with two poles in the tie point and the second branch road The negative pole connection of pipe.
The present invention further provides optimal technical scheme be:The tie point and the second branch road turn off valve cell Include the IGCT of multiple series connection;
The serial number of the IGCT determines according to the voltage class of blended learning power system to be accessed.
The present invention further provides optimal technical scheme be:The hybrid limit is controlled when power system normal operation Stream device works in normal operation mode, transmits the load current of the power system, specifically includes:
The ultrahigh speed mechanical switch of the through-flow branch road of stable state is closed, locking arc current processing branch road turns off valve cell.
The present invention further provides optimal technical scheme be:The hybrid limit is controlled when power system is broken down Stream device works in failure operation pattern, shifts the fault current of the power system, specifically includes:
Disconnect the ultrahigh speed mechanical switch of the through-flow branch road of stable state;
Detect the ultrahigh speed mechanical switch disjunction open away from, when the disjunction open away from reach it is specified open away from when trigger electric arc Current processing branch road turns off valve cell conducting, and the capacitor of the arc current processing branch road is opened to the ultrahigh speed machinery Close discharge quenching electric arc;
The terminal voltage of the capacitor is detected, valve cell can be turned off described in locking when the terminal voltage is zero.
Compared with immediate prior art, the beneficial effects of the invention are as follows:
1st, it is provided by the invention it is a kind of based on can shut-off valve force electric current transfevent blended learning, work as power system When breaking down, arc current processing branch road can inject reverse current to the through-flow branch road of stable state so that ultrahigh speed mechanical switch Not influenceed by arc voltage being capable of reliable disjunction;
2nd, it is provided by the invention it is a kind of based on can shut-off valve force electric current transfevent blended learning, at arc current Reason branch road can be realized carries out two-way charging to capacitor, i.e., when fault current flows to different directions, capacitor can be to it Reverse current is injected, the ultrahigh speed mechanical switch of the auxiliary through-flow branch road of stable state extinguishes electric arc.Meanwhile can shut-off valve list by locking Member can flow through the fault current of capacitor with fast shut-off;
3rd, it is provided by the invention it is a kind of based on can shut-off valve force electric current transfevent blended learning, ultrahigh speed machinery The contact resistance of switch is extremely low, and caused voltage drop and loss are extremely low, that is, reduces load current loss.
Brief description of the drawings
Fig. 1:In the embodiment of the present invention it is a kind of based on can shut-off valve the topology for forcing electric current transfevent blended learning Schematic diagram;
Fig. 2:View when blended learning is in normal operation mode in the embodiment of the present invention;
Fig. 3:A kind of capacitor discharge schematic diagram in the embodiment of the present invention;
Fig. 4:Another capacitor discharge schematic diagram in the embodiment of the present invention;
Fig. 5 is that arc current extinguishes path schematic diagram in the embodiment of the present invention;
Fig. 6 is to force electric current transferring path schematic diagram in the embodiment of the present invention;
Fig. 7 is that current limliting branch road puts into current path schematic diagram in the embodiment of the present invention.
Embodiment
To make the purpose, technical scheme and advantage of the embodiment of the present invention clearer, below in conjunction with the embodiment of the present invention In accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely illustrated, it is clear that described embodiment is Part of the embodiment of the present invention, rather than whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art The every other embodiment obtained under the premise of creative work is not made, belongs to the scope of protection of the invention.
Separately below with reference to accompanying drawing, to it is provided in an embodiment of the present invention it is a kind of based on can shut-off valve force electric current transfevent Blended learning illustrates.
Fig. 1 be the embodiment of the present invention in it is a kind of based on can shut-off valve the topology for forcing electric current transfevent blended learning Schematic diagram, as illustrated, in the present embodiment based on can shut-off valve force the electric current transfevent blended learning to include current limliting branch Road, stable state is through-flow branch road, arc current processing four parallel branches of branch road and arrester branch road.Wherein,
Current limliting branch road includes the current-limiting resistance R and reactor L of series connectionS
Stable state is through-flow, and branch road includes ultrahigh speed mechanical switch K, for transmitting load current and transfer fault current.This implementation When power system normal operation, the through-flow branch road of stable state is used to transmit load current in example, the stable state when power system is broken down Through-flow branch road is used to shift fault current.
Arc current processing branch road includes full-bridge circuit, for aiding in the through-flow branch road transfer fault current of stable state.
Arrester branch road, for preventing current limliting branch road produces overvoltage during current limliting from causing power equipment to damage.
The present embodiment provide it is a kind of based on can shut-off valve force electric current transfevent blended learning, work as power system When breaking down, arc current processing branch road can inject reverse current to the through-flow branch road of stable state so that ultrahigh speed mechanical switch K Not influenceed by arc voltage being capable of reliable disjunction.
Further, arc current processing branch road can use following topological structures in the present invention.
In the present embodiment the full-bridge circuit of arc current processing branch road include tie point in parallel respectively, the second branch road and 3rd branch road.Wherein,
What tie point included connecting turns off valve cell and diode, and it, which can turn off valve cell, includes multiple series connection IGCT, the serial number of IGCT can determine according to the voltage class of blended learning power system to be accessed.
Second branch road includes the resonant inductance and capacitor of series connection, and the positive pole of capacitor is connected with resonant inductance, negative pole point Negative pole not with diode in tie point and the second branch road is connected.
What the 3rd branch road included connecting turns off valve cell and diode, and it, which can turn off valve cell, includes multiple series connection IGCT, the serial number of IGCT can determine according to the voltage class of blended learning power system to be accessed.
One end of stable state is through-flow branch road is connected in tie point and can turned off between valve cell and diode, other end connection It can be turned off in the second branch road between valve cell and diode.
As shown in figure 1, tie point includes an IGCT GTO and diode D for series connection, the second branch road in the present embodiment Resonant inductance LZWith capacitor C, the 3rd branch road includes an IGCT GTO and diode D for series connection.Wherein, capacitor C is being just Pole and resonant inductance LZConnection, capacitor C negative pole are connected with above-mentioned two diode D negative pole.Wherein, arc current is handled Need to enter line precharge to capacitor C before branch road work so that it can inject reversely electricity after work to the through-flow branch road of stable state Stream extinguishes electric arc.
Fig. 3 and 4 is two kinds of capacitor discharge schematic diagrames in the embodiment of the present invention, as illustrated, electric arc electricity in the present embodiment Stream process branch road can be realized carries out two-way charge/discharge, i.e., the capacitor C when fault current flows to different directions to capacitor C Reverse current can be injected to it, the ultrahigh speed mechanical switch K of the auxiliary through-flow branch road of stable state extinguishes electric arc.Meanwhile by closing Lock can turn off valve cell can flow through capacitor C fault current with fast shut-off.
Separately below with reference to accompanying drawing, to it is provided in an embodiment of the present invention it is a kind of based on can shut-off valve force electric current transfevent The course of work of blended learning illustrates.
The mode of operation of blended learning includes normal operation mode and failure operation pattern in the present invention, wherein,
1st, blended learning is controlled to work in normal operation mode when power system normal operation, for transmitting electric power The load current of system.Specially:The ultrahigh speed mechanical switch of the through-flow branch road of stable state is closed, locking arc current processing branch road Valve cell can be turned off.
Fig. 2 is in view during normal operation mode for blended learning in the embodiment of the present invention, as schemed institute Show, ultrahigh speed mechanical switch K is closed in the present embodiment, two equal lockings of IGCT GTO, and the load current of power system passes through steady State is through-flow, and branch road transmits from left to right.Ultrahigh speed mechanical switch K contact resistance is extremely low in the present embodiment, caused voltage Drop and be lost it is extremely low, that is, reduce load current loss.
2nd, being broken down when power system controls blended learning to work in failure operation pattern, for transfer electrical power system The fault current of system.Specially:
(1) the ultrahigh speed mechanical switch of the through-flow branch road of stable state is disconnected.
After detecting that power system is broken down, ultrahigh speed mechanical switch is controlled quickly to disconnect by trigger signal.
(2) detect ultrahigh speed mechanical switch disjunction open away from, when disjunction open away from reach it is specified open away from when trigger arc current Processing branch road turns off valve cell conducting, and the capacitor of arc current processing branch road is electric to ultrahigh speed mechanical switch discharge quenching Arc.
Fig. 5 is that arc current extinguishes path schematic diagram in the embodiment of the present invention, as illustrated, detecting superelevation in the present embodiment Fast mechanical switch K disjunction open away from, when disjunction open away from reach its it is specified open away from after to IGCT GTO send conducting trigger signal, Capacitor C is allowd to pass through resonant inductance LZTo ultrahigh speed mechanical switch K discharge quenching electric arcs.Capacitor C in the present embodiment The current path to be discharged to ultrahigh speed mechanical switch K is as shown in Figure 3.
(3) terminal voltage of sensing capacitor, when terminal voltage is zero locking can turn off valve cell.
Fig. 6 is to force electric current transferring path schematic diagram in the embodiment of the present invention, as illustrated, working as capacitor in the present embodiment When C is to ultrahigh speed mechanical switch K injection reverse currents, fault current can also charge to capacitor C so that the electric capacity electricity of capacitor Pressure begins to decline and reversely, locking trigger signal is sent to IGCT GTO when capacitance voltage is reduced to zero, so as to by current limliting branch road Insert the amplitude and climbing of loop fault current limiting.
Fig. 7 is that current limliting branch road puts into current path schematic diagram in the embodiment of the present invention, as illustrated, failure in the present embodiment Electric current sequentially passes through current resistor R and reactor LSCirculation.Blended learning work is controlled after the completion of fault current suppression In normal operation mode, ultrahigh speed mechanical switch K is re-closed, current limliting branch road is bypassed load current is turned from current limliting branch road Move to the through-flow branch road of stable state.
It is provided by the invention it is a kind of based on can shut-off valve force electric current transfevent blended learning topological structure letter It is single easy, there is very strong operability.Meanwhile one of ordinary skill in the art will appreciate that realize in above-described embodiment method All or part of flow, it is that by computer program the hardware of correlation can be instructed to complete, described program can be stored in In one computer read/write memory medium, the program is upon execution, it may include such as the flow of the embodiment of above-mentioned each method.Its In, described storage medium can be magnetic disc, CD, read-only memory (Read-Only, ROM) or random access memory (Random Access Memory, RAM) etc..
Obviously, those skilled in the art can carry out the essence of various changes and modification without departing from the present invention to the present invention God and scope.So, if these modifications and variations of the present invention belong to the scope of the claims in the present invention and its equivalent technologies Within, then the present invention is also intended to comprising including these changes and modification.

Claims (6)

1. it is a kind of based on can shut-off valve force electric current transfevent blended learning, it is characterised in that the mixing type current-limiting Device includes current limliting branch road in parallel respectively, stable state is through-flow branch road, arc current processing branch road and arrester branch road;
The current limliting branch road includes the current-limiting resistance and reactor of series connection;
The through-flow branch road of stable state includes ultrahigh speed mechanical switch, for transmitting load current and transfer fault current;
The arc current processing branch road includes full-bridge circuit, for aiding in the through-flow branch road transfer fault current of the stable state.
2. it is as claimed in claim 1 it is a kind of based on can shut-off valve force electric current transfevent blended learning, its feature exists In the full-bridge circuit includes tie point, the second branch road and the 3rd branch road in parallel respectively;
What the tie point included connecting turns off valve cell and diode, and second branch road includes the resonant inductance of series connection And capacitor;What the 3rd branch road included connecting turns off valve cell and diode;
One end of the through-flow branch road of stable state is connected in the tie point and can turned off between valve cell and diode, the other end Being connected in second branch road to turn off between valve cell and diode.
3. it is as claimed in claim 2 it is a kind of based on can shut-off valve force electric current transfevent blended learning, its feature exists In,
The positive pole of the capacitor is connected with resonant inductance, negative pole respectively with diode in the tie point and the second branch road Negative pole connects.
4. it is as claimed in claim 2 it is a kind of based on can shut-off valve force electric current transfevent blended learning, its feature exists In the valve cell that turns off of the tie point and the second branch road includes the IGCT of multiple series connection;
The serial number of the IGCT determines according to the voltage class of blended learning power system to be accessed.
5. as described in claim any one of 1-4 it is a kind of based on can shut-off valve force electric current transfevent blended learning, Characterized in that, controlling the blended learning to work in normal operation mode when power system normal operation, institute is transmitted The load current of power system is stated, is specifically included:
The ultrahigh speed mechanical switch of the through-flow branch road of stable state is closed, locking arc current processing branch road turns off valve cell.
6. as described in claim any one of 1-4 it is a kind of based on can shut-off valve force electric current transfevent blended learning, Characterized in that, controlling the blended learning to work in failure operation pattern when power system is broken down, institute is shifted The fault current of power system is stated, is specifically included:
Disconnect the ultrahigh speed mechanical switch of the through-flow branch road of stable state;
Detect the ultrahigh speed mechanical switch disjunction open away from, when the disjunction open away from reach it is specified open away from when trigger arc current Processing branch road turns off valve cell conducting, and the capacitor of the arc current processing branch road is put to the ultrahigh speed mechanical switch Electricity extinguishes electric arc;
The terminal voltage of the capacitor is detected, valve cell can be turned off described in locking when the terminal voltage is zero.
CN201610705506.1A 2016-08-23 2016-08-23 It is a kind of based on can shut-off valve force electric current transfevent blended learning CN107769179A (en)

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CN201610705506.1A CN107769179A (en) 2016-08-23 2016-08-23 It is a kind of based on can shut-off valve force electric current transfevent blended learning
PCT/CN2017/084491 WO2018036214A1 (en) 2016-08-23 2017-05-16 Shutoff valve-based hybrid current limiter capable of forcing diversion of current

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CN111564830A (en) * 2020-07-15 2020-08-21 天津动态智能科技有限公司 Current limiting method of transformer current limiting device based on artificial zero-crossing current limiting

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CN109066606A (en) * 2018-07-12 2018-12-21 武汉杭久电气有限公司 A kind of two-way forced commutation type direct current current-limiting circuit breaker
CN109728571A (en) * 2018-12-19 2019-05-07 华北电力大学 A kind of hybrid fault current limiter of capacitor commutation and its control method
CN110212506A (en) * 2019-06-14 2019-09-06 哈尔滨工业大学 One kind can tandem type solid-state direct-current fault current limiter, cascade structure and working method
CN111564830A (en) * 2020-07-15 2020-08-21 天津动态智能科技有限公司 Current limiting method of transformer current limiting device based on artificial zero-crossing current limiting
CN111564830B (en) * 2020-07-15 2020-10-13 天津动态智能科技有限公司 Current limiting method of transformer current limiting device based on artificial zero-crossing current limiting

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