CN103178486B - A kind of dc circuit breaker and cutoff method thereof - Google Patents

A kind of dc circuit breaker and cutoff method thereof Download PDF

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Publication number
CN103178486B
CN103178486B CN201310061174.4A CN201310061174A CN103178486B CN 103178486 B CN103178486 B CN 103178486B CN 201310061174 A CN201310061174 A CN 201310061174A CN 103178486 B CN103178486 B CN 103178486B
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China
Prior art keywords
loop
inverter
circuit
current
control circuit
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CN201310061174.4A
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Chinese (zh)
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CN103178486A (en
Inventor
魏晓光
罗湘
曹均正
汤广福
邱宇峰
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国网智能电网研究院
中电普瑞电力工程有限公司
国家电网公司
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Priority to CN201310061174.4A priority Critical patent/CN103178486B/en
Publication of CN103178486A publication Critical patent/CN103178486A/en
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Abstract

The present invention provides a kind of dc circuit breaker, and including the commutation circuit being connected in parallel, cutout loop and energy absorption loop, wherein, chopper includes control circuit, is connected with described commutation circuit, cutout loop, energy absorption loop and total line respectively;Commutation circuit includes convertor unit and the mechanical switch of at least one of series connection;Cutout loop includes the interruption units of N number of series connection.By controlling this dc circuit breaker, it is possible to quickly thick-less vane electric current, and on the premise of realizing bidirectional cutting ability, greatly reduce use power semiconductor switch quantity, reduce cost.

Description

A kind of dc circuit breaker and cutoff method thereof
Technical field
The invention belongs to electric and electronic technical field, be specifically related to a kind of dc circuit breaker and cutoff method thereof.
Background technology
Along with the application that starts of multiterminal flexible direct current based on voltage source converter (VSC) and direct current network technology, quickly Dc circuit breaker becomes one of key equipment ensureing system stability safe and reliable operation.In AC system, alternating current At a cycle memory at two natural zero-crossing points, AC circuit breaker utilizes the natural zero-crossing point cut-off current of electric current just, And in straight-flow system, there is not natural zero-crossing point in DC current, therefore DC current cut-off opening more than alternating current Disconnected difficulty.
Breaking direct current generally has two ways, and one is on the basis of regular alternating current mechanical chopper, by increasing Auxiliary circuit, the oscillating current of superposition amplification on the DC current cut-offfing arc gap, cut-off circuit when utilizing current over-zero, Utilize the mechanical type chopper that this principle manufactures, break cannot meet wanting of Multi-end flexible direct current transmission system Ask;Another kind is to utilize the high-power power electronic devices that turns off, and direct disjunction DC current utilizes this principle manufacture Solid circuit breaker, although the requirement of multiterminal flexible direct current system can be met in time, but the damage when normally Consuming excessive, economy is poor.
Summary of the invention
For the deficiencies in the prior art, the present invention proposes a kind of dc circuit breaker and cutoff method thereof, it is achieved that with turning off Power electronic devices cuts off DC current, without arc cutting, fireballing effect.
A kind of dc circuit breaker that the present invention provides, commutation circuit that described chopper includes being connected in parallel, cutout loop and Energy absorption loop, it thes improvement is that,
Described chopper includes control circuit, and described control circuit is inhaled with described commutation circuit, cutout loop, energy respectively Regain road and total line connects;
Described commutation circuit includes convertor unit and the mechanical switch of at least one of series connection;
Described cutout loop includes the interruption units of N number of series connection.
Wherein, described convertor unit and described interruption units all include the inverter of full bridge structure.
Wherein, the inverter of described full bridge structure includes four diodes and the power semiconductor switch of at least one;
Each two Diode series constitutes a branch road, two branch circuit parallel connections, and draws the intermediate point of two branch roads respectively, As input or outfan;
The branch circuit parallel connection that power semiconductor switch is constituted with described diode.
Wherein, described energy absorption loop includes spark gap.
Wherein, described energy absorption loop includes slide rheostat.
The cutoff method of a kind of dc circuit breaker that the present invention provides based on another object, it thes improvement is that, described side Method comprises the steps:
A, control circuit control the converter deblocking of convertor unit, close mechanical switch;
B, control circuit monitor the electric current of each branch road, and when needing the DC current cut-offfing in loop, control circuit triggers disconnected Converter deblocking in stream unit, if receiving locking convertor unit inverter signal, then locking convertor unit inverter;
C, disconnect described mechanical switch;
If D receives locking interruption units inverter signal, then control circuit locking interruption units inverter, turns electric current Shift in energy absorption loop.
Wherein, before generating and sending interruption units converter blocking signal, generate and send convertor unit block signal.
Wherein, if electric current sends described convertor unit inverter cut-off signal more than the first current limitation, control circuit;
First current limit value is more than or equal to the rated current of connection current conversion station.
Wherein, step C control circuit judge electric current when commutation circuit is switched to stop loop, control circuit disconnects described Mechanical switch.
Wherein, at described transmission line of electricity or distribution line, or when the electric device being connected to described circuit breaks down, Then control circuit generates, sends and receive interruption units converter blocking signal;
Wherein, from described convertor unit converter blocking or from described high speed machine switch off the second segment time Inside being not received by under interruption units converter blocking RST, described high speed machine switch re-closes, the described change of current Unit converter deblocking.
Wherein, described high speed machine switch Guan Bi and described convertor unit converter deblocking after still receive or again Receive described convertor unit converter blocking signal, first locking convertor unit inverter, hereafter disconnect high speed machine and open Close, and if hereafter receiving described interruption units converter blocking signal, locking interruption units inverter.
Compared with the prior art, the invention have the benefit that
1, the dc circuit breaker circuit topology that the present invention provides, is undertaken normally electric current, commutation circuit by commutation circuit Middle convertor unit series connection progression is few, and therefore on-state loss during dc circuit breaker normally is low.
2, the dc circuit breaker circuit topology that the present invention provides, is no current disjunction by high speed machine switch, greatly speeds up Switch breaking speed.
3, the present invention provides direct-current breaker topology on-state loss low.
4, the present invention provides dc circuit breaker convertor unit and interruption units use full bridge structure, and modularity reduces right The conforming requirement of power electronic devices, it is easy to being used in series of dc circuit breaker power electronic devices.
5, the dc circuit breaker circuit topology that the present invention provides, is cut off direct current by the power semiconductor switch in cutout loop Electric current, without arc cutting, speed is fast.
6, the present invention provide dc circuit breaker and conduct bidirectional current can be realized, reduce to power electronic devices driving The requirement of circuit, reduces cost simultaneously.
7, the direct-current breaker topology novel structure that the present invention provides is succinct, complete function, controls simple.
8, the cutoff method that the present invention provides, it is possible to safety, guarantee chopper orderly, reliable are properly functioning.
Accompanying drawing explanation
The electrical structure schematic diagram of the chopper that Fig. 1 provides for the present invention.Wherein, K is mechanical switch;Z is spark gap.
The exemplary plot of the full bridge structure inverter that Fig. 2 provides for the present invention.
The exemplary plot of the chopper realized based on full bridge structure that Fig. 3 provides for the present invention.
Fig. 4 is that chopper of the present invention is connected exemplary plot with control circuit.
Detailed description of the invention
Below in conjunction with the accompanying drawings the detailed description of the invention of the present invention is described in further detail.
A kind of chopper that the present embodiment proposes, commutation circuit that its electrical structure as it is shown in figure 1, include is connected in parallel, Cutout loop and energy absorption loop;On this, this rational dc circuit breaker includes that control circuit, control circuit are divided Not being connected with commutation circuit and cutout loop, for controlling commutation circuit and the conducting in cutout loop and shutoff, it can include Processor, DSP or FPGA etc., as shown in Figure 4.And, the present embodiment it is further proposed that,
Commutation circuit for being switched to the loop that stops by foreign current, including the mechanical switch being connected in series and convertor unit, Conduct bidirectional current;Convertor unit is solely subjected to on-state voltage drop during cut-off switch conducting;High speed machine switches off consequence and is subject to The voltage of whole chopper.
The DC current that cutout loop is responsible in fast shut-off loop after high speed machine switches off, can turn off two-way electricity Stream.It includes the interruption units being connected in series.
Convertor unit and interruption units are constituted by the inverter of full bridge structure.
The inverter of full bridge structure includes that 4 diodes and at least one power semiconductor switch form, as in figure 2 it is shown, Each two Diode series constitutes a branch road, two branch circuit parallel connections, and draws the intermediate point of two branch roads respectively, as Input or outfan, power semiconductor switch is connected to two series arm midpoints;The inverter of one full bridge structure, change Stream inductance and mechanical switch commutation circuit in series, the inverter of N number of full bridge structure and cutout inductance cutout in series Loop.By the chopper example of the inverter realization of full bridge structure as shown in Figure 3.
Energy absorption loop is after the cut-off loop DC current of cutout loop, it is possible to absorbs inductance in DC transmission system and stores Energy, including spark gap or slide rheostat.When utilizing slide rheostat to realize, when the voltage in system is the biggest, The resistance of slide rheostat is the lowest, when the voltage in system is the least, and the resistance of slide rheostat is the highest.
Using the cutoff method that the dc circuit breaker of the present embodiment realizes, its step is as follows:
A, control circuit control the converter deblocking of convertor unit, close mechanical switch;
B, control circuit monitor the electric current of each branch road, at described transmission line of electricity or distribution line, or are connected to described line When the electric device on road breaks down, then control circuit generates, sends and receive interruption units converter blocking signal;If Electric current sends described convertor unit inverter cut-off signal more than the first current limitation, control circuit;First current limit value Rated current more than or equal to connection current conversion station;
C, control circuit judge electric current from commutation circuit be switched to stop loop time, control circuit disconnect described mechanical switch;
If D receives locking interruption units inverter signal, then locking interruption units inverter, electric current is changed to energy In amount absorption circuit.
In the second segment time from described convertor unit converter blocking or from the disconnection of described mechanical switch (by power half Conductor switch without cooling in the case of tolerate current capacity determine) in be not received by interruption units converter blocking signal feelings Under condition, described high speed machine switch re-closes, described convertor unit converter deblocking.
Still receive after described mechanical switch Guan Bi and described convertor unit converter deblocking or again receive institute State convertor unit converter blocking signal, first locking convertor unit inverter, hereafter disconnect high speed machine switch, and If hereafter receiving described interruption units converter blocking signal, locking interruption units inverter.
The present embodiment uses full bridge structure power semiconductor switch module to achieve the function of the change of current and cutout, it is achieved that save The effect of cost.
Finally should be noted that: above example only in order to illustrate that technical scheme is not intended to limit, although Being described in detail the present invention with reference to above-described embodiment, those of ordinary skill in the field are it is understood that still The detailed description of the invention of the present invention can be modified or equivalent, and appointing without departing from spirit and scope of the invention What amendment or equivalent, it all should be contained in the middle of scope of the presently claimed invention.

Claims (8)

1. a dc circuit breaker, described chopper includes commutation circuit, cutout loop and the energy absorption being connected in parallel Loop, it is characterised in that
Described chopper includes control circuit, and described control circuit is inhaled with described commutation circuit, cutout loop, energy respectively Regain road and total line connects;For controlling commutation circuit and the conducting in cutout loop and shutoff;
Described commutation circuit includes convertor unit and the mechanical switch of at least one of series connection;
Described cutout loop includes the interruption units of N number of series connection;
Described convertor unit and described interruption units all include the inverter of full bridge structure;
The inverter of described full bridge structure includes four diodes and the power semiconductor switch of at least one;
Each two Diode series constitutes a branch road, two branch circuit parallel connections, and draws the intermediate point of two branch roads respectively, As input or outfan;
The branch circuit parallel connection that described power semiconductor switch is constituted with described diode;
Described energy absorption loop includes spark gap or slide rheostat.
2. the cutoff method of a dc circuit breaker as claimed in claim 1, it is characterised in that described method includes Following steps:
A, control circuit control the converter deblocking of convertor unit, close mechanical switch;
B, control circuit monitor the electric current of each branch road, and when needing the DC current cut-offfing in loop, control circuit triggers disconnected Converter deblocking in stream unit, if receiving locking convertor unit inverter signal, then locking convertor unit inverter;
C, disconnect described mechanical switch;
If D receives locking interruption units inverter signal, then control circuit locking interruption units inverter, turns electric current Shift in energy absorption loop.
3. cutoff method as claimed in claim 2, it is characterised in that close generating and send interruption units inverter Generate before lock signal and send convertor unit block signal.
4. cutoff method as claimed in claim 2, it is characterised in that if electric current is more than the first current limitation, control Circuit sends described convertor unit inverter cut-off signal;
First current limit value is more than or equal to the rated current of connection current conversion station.
5. cutoff method as claimed in claim 2, it is characterised in that step C control circuit judges that electric current is from the change of current When loop switch is to cutout loop, control circuit disconnects described mechanical switch.
6. cutoff method as claimed in claim 2, it is characterised in that at transmission line of electricity or distribution line, or even Receive the electric device of described circuit when breaking down, then control circuit generates, sends and receive interruption units inverter and close Lock signal.
7. cutoff method as claimed in claim 2, it is characterised in that from described convertor unit converter blocking Or it is not received by under interruption units converter blocking RST in the second segment time from the disconnection of described mechanical switch, Described mechanical switch re-closes, described convertor unit converter deblocking.
8. cutoff method as claimed in claim 7, it is characterised in that in described mechanical switch Guan Bi and the described change of current Still receive after unit converter deblocking or again receive described convertor unit converter blocking signal, first locking Convertor unit inverter, hereafter disconnects mechanical switch, and if hereafter receiving described interruption units converter blocking letter Number then locking interruption units inverter.
CN201310061174.4A 2013-02-27 2013-02-27 A kind of dc circuit breaker and cutoff method thereof CN103178486B (en)

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CN103337851B (en) * 2013-07-04 2015-09-23 国家电网公司 A kind of half control type active injection current high voltage direct current breaker and its implementation
CN103337829B (en) * 2013-07-04 2016-08-10 国家电网公司 A kind of half control type passive injection current high voltage direct current breaker and its implementation
GB2519791B (en) * 2013-10-30 2016-10-05 Alstom Technology Ltd Breaker circuit
CN103762547A (en) * 2014-01-08 2014-04-30 西安交通大学 Modular high-voltage vacuum direct current on-off device based on artificial zero crossing
CN104300517B (en) * 2014-05-05 2018-07-17 西南交通大学 A kind of unidirectional variable-pressure high voltage DC breaker based on improved One Buck-Boost converter body
CN104300516B (en) * 2014-05-05 2017-04-19 西南交通大学 Unidirectional transformation-type high-voltage DC circuit breaker based on Buck convertor
CN105807118A (en) * 2014-12-30 2016-07-27 国家电网公司 Virtual current testing device and testing method thereof for high-voltage DC circuit breaker
CN104637752B (en) * 2015-02-06 2018-04-06 孙毅彪 Formula primary cut-out is controlled by force without electric arc type parallel connection learning bridge
CN104637751B (en) * 2015-02-06 2018-05-22 孙毅彪 No electric arc type series connection learning bridge controls by force formula high-voltage circuitbreaker
US9742185B2 (en) * 2015-04-28 2017-08-22 General Electric Company DC circuit breaker and method of use
CN106558865B (en) * 2015-09-25 2019-03-15 全球能源互联网研究院 A kind of modified cascade full-bridge high voltage DC breaker and its quick coincidence method
CN106209039A (en) * 2016-08-18 2016-12-07 平高集团有限公司 A kind of novel mixed type dc circuit breaker and power cell
CN106532661B (en) * 2016-11-22 2019-08-06 平高集团有限公司 A kind of separating brake control method of high voltage DC breaker
CN106786349A (en) * 2016-11-22 2017-05-31 平高集团有限公司 A kind of assist exchanging circuit module and high voltage DC breaker
DE102017101451A1 (en) * 2017-01-25 2018-07-26 Eaton Industries (Austria) Gmbh Low-voltage protection device
CN107800120B (en) * 2017-09-29 2019-02-26 浙江大学 A kind of capacitive dc circuit breaker and its DC Line Fault processing strategie
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CN2301784Y (en) * 1997-04-21 1998-12-23 浙江三强科技工业有限公司 Compound non-arcing DC circuit breaker
CN102687221A (en) * 2009-11-16 2012-09-19 Abb技术有限公司 Device and method to break the current of a power transmission or distribution line and current limiting arrangement

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Address after: 102209 Beijing City, Changping District science and Technology Park in the future smart grid research institute hospital

Co-patentee after: China-EPRI Electric Power Engineering Co., Ltd.

Patentee after: GLOBAL ENERGY INTERCONNECTION RESEARCH INSTITUTE

Co-patentee after: State Grid Corporation of China

Address before: 102211 Beijing city Changping District Xiaotangshan town big East Village Road No. 270 (future technology city)

Co-patentee before: China-EPRI Electric Power Engineering Co., Ltd.

Patentee before: State Grid Smart Grid Institute

Co-patentee before: State Grid Corporation of China

TR01 Transfer of patent right

Effective date of registration: 20170531

Address after: 102209 Beijing City, Changping District science and Technology Park in the future smart grid research institute hospital

Co-patentee after: State Grid Corporation of China

Patentee after: GLOBAL ENERGY INTERCONNECTION RESEARCH INSTITUTE

Address before: 102209 Beijing City, Changping District science and Technology Park in the future smart grid research institute hospital

Co-patentee before: China-EPRI Electric Power Engineering Co., Ltd.

Patentee before: GLOBAL ENERGY INTERCONNECTION RESEARCH INSTITUTE

Co-patentee before: State Grid Corporation of China