CN103971965B - A kind of device and control method thereof making line current disjunction - Google Patents

A kind of device and control method thereof making line current disjunction Download PDF

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Publication number
CN103971965B
CN103971965B CN201310039556.7A CN201310039556A CN103971965B CN 103971965 B CN103971965 B CN 103971965B CN 201310039556 A CN201310039556 A CN 201310039556A CN 103971965 B CN103971965 B CN 103971965B
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China
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current
branch road
power semiconductor
circuit breaker
brachium pontis
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CN103971965A (en
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方太勋
曹冬明
王宇
杨浩
杨兵
石巍
吕玮
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NR Electric Co Ltd
NR Engineering Co Ltd
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NR Electric Co Ltd
NR Engineering Co Ltd
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Priority to CN201310039556.7A priority Critical patent/CN103971965B/en
Priority to PCT/CN2013/090484 priority patent/WO2014117608A1/en
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    • 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
    • H02H9/025Current limitation using field effect transistors
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02HEMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/08Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
    • H02H3/087Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current for dc applications

Abstract

The present invention discloses a kind of device making line current disjunction, comprises Unidirectional direct-current circuit breaker; Also comprise bridge-type branch road, described bridge-type branch road comprises two brachium pontis be made up of 4 identical commutation branch roads, described 4 commutation branch roads one group of series aiding connection between two, two brachium pontis formed carry out parallel connection again, and the series aiding connection that described each commutation branch road includes at least one the first power semiconductor connects; Two brachium pontis of described bridge-type branch road are all in parallel with Unidirectional direct-current circuit breaker, and the two ends of circuit connect the brachium pontis mid point of bridge-type branch road two brachium pontis respectively.This device under the enough fast breaking speed of guarantee and low-loss prerequisite, can reduce the cost of device greatly, reduces the difficulty of device device layout, installation and wiring.The present invention also discloses a kind of control method making the device of line current disjunction.

Description

A kind of device and control method thereof making line current disjunction
Technical field
The present invention relates to a kind of device making the electric current disjunction of current through line, and a kind of method controlling this device.
Background technology
In multi-terminal direct current transmission system, high voltage DC breaker is one of vital equipment.Multiterminal HVDC transmission system, because electric pressure is high, line impedance is little, once there is line short fault, will have influence on direct current transportation network and AC network very soon, must excise fault rapidly.Therefore, high voltage DC breaker needs quick action, can reduce trouble duration to greatest extent or suppress fault current, reduces fault to the impact of AC/DC electric power transmission network.Because high voltage DC breaker is series at transmission line, in transmission line, direction of tide is uncertain, and electric current may exist both direction, therefore requires that circuit breaker can the direct current of disjunction both direction.
Chinese patent application CN102780200A adopts conventional high-tension DC circuit breaker disjunction direct current, and the structure of conventional high-tension DC circuit breaker is made up of 3 parts: AC circuit breaker, LC oscillation circuit and dissipative cell.AC circuit breaker produces electric arc after separating, arc voltage and LC oscillation circuit generation resonance, can offset direct current completely when oscillating current peak value reaches direct current amplitude, make breaker port occur zero crossing, impel arc extinction, realize the object turning off direct current.This disjunction mode does not comprise power semiconductor, does not have directivity, therefore, and can the electric current of disjunction both direction, and during normal work, loss is very little.But the conventional high-tension DC circuit breaker quenching time is longer, about a few tens of milliseconds, the demand of isolation multi-terminal direct current transmission system fault fast cannot be met.
For meeting quick isolated DC fault current and keeping higher power transmission efficiency, Chinese patent application CN102687221A discloses a kind of apparatus and method of the short circuit current of transmission line or distribution line and current limliting of making and arranges, comprises main circuit breaker, speed-sensitive switch, auxiliary circuit breaker and nonlinear resistance dissipative cell.Under normal mode of operation, line current flows through subsidiary loop, and on-state loss is little; Under fault mode, electric current changes to main circuit breaker, finally absorbs breaking capacity by dissipative cell.
After this high voltage direct current tripper turns off fault current, main circuit breaker bears hundreds of kV voltage, and only on a sense of current, power semiconductor series connection number just reaches hundreds of.Because power semiconductor can only one direction conducting, in order to realize can both turning off fault current on two senses of current, the basic series unit of main circuit breaker in this high voltage direct current tripper have employed two power semiconductor anti-series or inverse parallel structure, the power semiconductor quantity of main circuit breaker adds one times, when the first sense of current disjunction, the power semiconductor of second sense of current is to breaking current or bear voltage and do not have beneficial effect, and the utilance being equivalent to main circuit breaker power semiconductor only has 50%.Because the cost of power semiconductor occupies very large ratio in this assembly of devices basis, therefore in order to realize the breaking function of bidirectional current, considerably increase the cost of device.In main circuit breaker, the increase of the power semiconductor of second sense of current not only can not produce beneficial effect, and the power semiconductor of second sense of current can be subject to the adverse effect of overvoltage and the overcurrent produced when first sense of current turns off on the contrary.If the power semiconductor of second sense of current adopts the mode of reverse parallel connection to be connected with the power semiconductor of first sense of current, overvoltage when first sense of current turns off will be applied on the power semiconductor of second sense of current, this voltage for second sense of current power semiconductor be reverse voltage, damage can be caused to device; If adopt the power semiconductor of band anti-paralleled diode of second sense of current to adopt the mode of differential concatenation to be connected with the power semiconductor of the band anti-paralleled diode of first sense of current, the fly-wheel diode that the very high mutation current produced in the first sense of current turn off process will flow through in the power semiconductor of second sense of current, can cause adverse effect to the life-span of device.
The power semiconductor of second sense of current increased also can cause adverse influence to the structural design of main circuit breaker and electrical design, the arranged direction of the power semiconductor of first sense of current is consistent, makes electrical design and structural design have consistency.The increase of the power semiconductor of second sense of current destroys the consistency of original arranged direction, causes device layout, installs, and the difficulty of wiring increases.
Summary of the invention
Object of the present invention, is to provide a kind of device and the control method thereof that make line current disjunction, under the enough fast breaking speed of guarantee and low-loss prerequisite, greatly reduces the cost of device, reduces the difficulty of device device layout, installation and wiring.
In order to reach above-mentioned purpose, the solution that the present invention adopts is:
Make a device for line current disjunction, comprise Unidirectional direct-current circuit breaker; Also comprise bridge-type branch road, described bridge-type branch road comprises two brachium pontis be made up of 4 identical commutation branch roads, described 4 commutation branch roads one group of series aiding connection between two, two brachium pontis formed carry out parallel connection again, and the series aiding connection that described each commutation branch road includes at least one the first power semiconductor connects; Two brachium pontis of described bridge-type branch road are all in parallel with Unidirectional direct-current circuit breaker, and the two ends of circuit connect the brachium pontis mid point of bridge-type branch road two brachium pontis respectively.
Above-mentioned each commutation branch road also comprises at least one high-speed disconnecting switch, and described high-speed disconnecting switch is connected in the main line of commutation branch road.
Each first power semiconductor in above-mentioned each commutation branch road is all parallel with three power semiconductor identical with it.
The equal reverse parallel connection of each first power semiconductor in above-mentioned each commutation branch road has one to have to open the 4th power semiconductor of turn-off capacity.
Above-mentioned each commutation branch road includes five power semiconductor identical with aforementioned first power semiconductor quantity and model, after described 5th power semiconductor series aiding connection, carries out in parallel in the same way with the first power semiconductor after aforementioned series connection.
Above-mentioned Unidirectional direct-current circuit breaker comprises main circuit breaker and the nonlinear resistance of connection parallel with one another, described main circuit breaker comprises the second power semiconductor of at least one series aiding connection, and open direction and the line current of described second power semiconductor switch are entered by brachium pontis mid point and the flow direction flowed through after arbitrary commutation branch road is consistent.
Each second power semiconductor in above-mentioned main circuit breaker is all parallel with six power semiconductor identical with it.
Above-mentioned main circuit breaker also comprises seven power semiconductor identical with aforementioned second power semiconductor quantity and model, after described 7th power semiconductor series aiding connection, carries out in parallel in the same way with the second power semiconductor after aforementioned series connection.
Above-mentioned Unidirectional direct-current circuit breaker also comprises a branch road be all connected in parallel with aforementioned main circuit breaker, nonlinear resistance, this branch road comprises the speed-sensitive switch and auxiliary circuit breaker that are mutually connected in series, wherein, speed-sensitive switch comprises at least one high-speed disconnecting switch of mutually connecting, auxiliary circuit breaker comprises the 8th power semiconductor of at least one series aiding connection, and the direction of the 8th power semiconductor is identical with the direction of the second power semiconductor.
Make a control method for the device of line current disjunction, described device is connected in series to the current path of circuit with the brachium pontis mid point of two brachium pontis in bridge-type branch road; Unidirectional direct-current circuit breaker in closing device, the high-speed disconnecting switch in closed bridge-type branch road and the first power semiconductor, described method comprises the steps:
If-receive the cut-off signal of described Unidirectional direct-current circuit breaker, determine the first power semiconductor of the negative electrode that the brachium pontis that is connected with current input terminal is directly or indirectly connected with this current input terminal, disconnect the high-speed disconnecting switch of this first power semiconductor place commutation branch road; Determine the first power semiconductor of the anode that the brachium pontis that is connected with current output terminal is directly or indirectly connected with this current output terminal, disconnect the high-speed disconnecting switch of this first power semiconductor place commutation branch road;
-after this, disconnect described Unidirectional direct-current circuit breaker;
-high-speed disconnecting switch being in closure state is disconnected, complete whole breaking course.
After adopting such scheme, the present invention has following characteristics:
-compared with conventional high-tension DC circuit breaker, breaking speed of the present invention is very fast, adopt power semiconductor as breaking current performance element, speed is very fast, the breaking speed of usual power semiconductor only needs tens microseconds, negligible, total break-time of device is mainly the break-time of high-speed disconnecting switch, at present, the breaking speed of high-speed disconnecting switch can reach 1-3ms, can predict, total break-time of the present invention is at about 3-5ms, more faster than the breaking speed of conventional high-tension DC circuit breaker;
-only needing less cost can realize the disjunction of bidirectional current: the Unidirectional direct-current circuit breaker in the present invention can use the power switching device series of the same sense of current to form, and making the bidirectional current in circuit flow through Unidirectional direct-current circuit breaker by electric current commutation branch road is same direction.When line current is first sense of current, electric current commutation branch road (A, D) consistent with first sense of current, electric current commutation branch road (B, C) power semiconductor in is contrary with first sense of current, be in reverse blocking state, the direction flowing through Unidirectional direct-current circuit breaker is from node (1) to node (2); When line current is second sense of current, electric current commutation branch road (B, C) is consistent with second sense of current, and the power semiconductor in electric current commutation branch road (A, D) is contrary with second sense of current, is in reverse blocking state.The direction flowing through Unidirectional direct-current circuit breaker is always from node (1) to node (2).
As can be seen here, when line current direction is different, the sense of current flowing through Unidirectional direct-current circuit breaker is consistent.Electric current commutation branch road comprises altogether a small amount of power semiconductor and four groups of high-speed disconnecting switches, and power semiconductor quantity is little, and cost is very low, high-speed disconnecting switch just separates under no current state, without the need to arc extinguishing, only play the effect cutting off voltage, cost is lower.Overall cost cost compared with patent CN102687221A reduces greatly, improves the utilization ratio of the power semiconductor in device, avoids the defect that patent CN102687221A realizes two-way function simultaneously.
Accompanying drawing explanation
Fig. 1 is the connection diagram of apparatus of the present invention;
Fig. 2 is the direction corresponding relation figure of first sense of current and power semiconductor;
Fig. 3 is the direction corresponding relation figure of second sense of current and power semiconductor;
Fig. 4 is that anatomical connectivity figure implemented by first of electric current commutation branch road in the present invention;
Fig. 5 is that anatomical connectivity figure implemented by second of electric current commutation branch road in the present invention;
Fig. 6 is that anatomical connectivity figure implemented by the 3rd of electric current commutation branch road in the present invention.
Embodiment
As shown in Figure 1, a kind of device 20 making the disjunction of circuit 44 electric current of the present invention, comprises Unidirectional direct-current circuit breaker 10 parallel with one another and bridge-type branch road, and two and contact are node 1 and node 2 respectively, introduce respectively below.
Unidirectional direct-current circuit breaker 10 comprises main circuit breaker 9 and the nonlinear resistance 13 of connection parallel with one another, wherein, main circuit breaker 9 comprises the power semiconductor 5 of at least one series aiding connection, and makes the direction of described power semiconductor 5 consistent with the sense of current flowing to node 2 from node 1; Described Unidirectional direct-current circuit breaker 10 also comprises a branch road be all connected in parallel with aforementioned main circuit breaker 9, nonlinear resistance 13, this branch road comprises the speed-sensitive switch 11 and auxiliary circuit breaker 12 that are mutually connected in series, wherein, speed-sensitive switch 11 comprises at least one high-speed disconnecting switch of mutually connecting, auxiliary circuit breaker 12 comprises the power semiconductor of at least one mutual series aiding connection, and the direction of this power semiconductor is consistent with the sense of current flowing to node 2 from node 1, the conducting resistance of described auxiliary circuit breaker 12 is less than main circuit breaker 9.
Bridge-type branch road comprises two brachium pontis be made up of 4 identical commutation branch road A, B, C, D, concrete annexation is: commutation branch road A, B series aiding connection, forms a brachium pontis, commutation branch road C, D series aiding connection, form another brachium pontis, described two brachium pontis carry out parallel connection again; One end of circuit 44 connects the brachium pontis mid point 3 of commutation branch road A, B formation, and the other end of described circuit 44 connects the brachium pontis mid point 4 that commutate branch road C, D are formed.
Each commutation branch road includes at least one power semiconductor 7 of series aiding connection, as shown in Figure 6, this kind of structure does not need to use high-speed disconnecting switch, but being connected in series requirement and can bearing very high voltage of power semiconductor 7, need the devices in series of a lot of quantity.
Described commutation branch road also can be connected at least one high-speed disconnecting switch 6, and as shown in Figure 4, the effect of described high-speed disconnecting switch 6 cuts off voltage.Have no progeny Unidirectional direct-current circuit breaker 10 points, very high disjunction voltage can be produced between node 1 and node 2, this voltage is applied to bridge-type branch road, high-speed disconnecting switch 6 can bear very high disjunction voltage, the power semiconductor 7 in commutation branch road A, B, C, D is made to bear very little disjunction voltage, only need very few number devices in series, this mode is economy system cost more.
As shown in Figure 5, be another enforcement structure of commutation branch road, on the basis of structure shown in Fig. 4, each power semiconductor 7 all reverse parallel connection one has the power semiconductor 8 opening turn-off capacity.
It should be noted that, main circuit breaker 9 in described Unidirectional direct-current circuit breaker 10, its structure is except by except multiple power semiconductor 5 series aiding connection, also can adopt following two kinds of syndetons: (1) comprises even number of power semiconductor device, described power semiconductor two one group is in parallel in the same way, and then series aiding connection; (2) comprise even number of power semiconductor device, be divided into two groups, each organizes equal series aiding connection, and these two groups are carried out in parallel in the same way again.Adopt above syndeton, the current capacity that bears of Unidirectional direct-current circuit breaker 10 can be doubled.
Power semiconductor 7 in described each commutation branch road is except aforesaid series aiding connection, also can adopt following two kinds of syndetons: (1) comprises even number of power semiconductor device, described power semiconductor two one group is in parallel in the same way, and then series aiding connection; (2) comprise even number of power semiconductor device, be divided into two groups, each organizes equal series aiding connection, and these two groups are carried out in parallel in the same way again.Adopt above syndeton, the current capacity that bears of Unidirectional direct-current circuit breaker 10 can be doubled.
The present invention also provides a kind of control method for aforementioned means 20, described device 20 is connected in series to the current path of circuit 44, Unidirectional direct-current circuit breaker 10 in wherein said device 20 closes, if the high-speed disconnecting switch 6(of electric current commutation branch road A, B, C, D does not have to omit it and controls, lower with) and power semiconductor 7 closed, described control method comprises the following steps:
If-receive the cut-off signal of described Unidirectional direct-current circuit breaker 10, judge the sense of current of circuit 44, if be first sense of current 14, disconnect the high-speed disconnecting switch 6 of commutation branch road B, C simultaneously;
When for first sense of current 14, as shown in Figure 2, commutation branch road B, C can bear the high breaking voltage that Unidirectional direct-current circuit breaker 10 disjunction produces, therefore, before Unidirectional direct-current circuit breaker 10 disjunction, must by the high-speed disconnecting switch 6 of commutation branch road B, C separately, damage to prevent the power semiconductor 7 of above-mentioned branch road from bearing high breaking voltage; And commutate branch road A, D and Unidirectional direct-current circuit breaker 10 are connected in series relation, has breaking current to flow through, but can not bear high breaking voltage, should be kept closed.
If be second sense of current 15, disconnect the high-speed disconnecting switch 6 of commutation branch road A, D simultaneously;
When for second sense of current 15, as shown in Figure 3, commutation branch road A, D can bear the high breaking voltage that Unidirectional direct-current circuit breaker 10 disjunction produces, therefore, before Unidirectional direct-current circuit breaker 10 disjunction, must by the high-speed disconnecting switch 6 of commutation branch road A, D separately, damage to prevent the power semiconductor 7 of above-mentioned branch road from bearing high breaking voltage; And commutate branch road B, C and Unidirectional direct-current circuit breaker 10 are connected in series relation, has breaking current to flow through, but can not bear high breaking voltage, should be kept closed.
-after this, disconnect described Unidirectional direct-current circuit breaker 10.
When-confirmation line current reduces to zero, the high-speed disconnecting switch 6 being in closure state is disconnected, complete whole breaking course in commutation branch road A, B, C, D.
Below with reference to specific embodiment, technical scheme of the present invention is described.
Design apparatus 20 can the bidirectional current of disjunction ± 200kV HVDC (High Voltage Direct Current) transmission line, and electric current breaking capacity is 2kA.
As shown in Figure 1, the device 20 of this circuit bidirectional current of disjunction comprises Unidirectional direct-current circuit breaker 10 and electric current commutation branch road A, B, C, D, wherein Unidirectional direct-current circuit breaker 10 comprises main circuit breaker 9 and the nonlinear resistance 13 of connection parallel with one another, and wherein main circuit breaker 9 at least comprises a power semiconductor 5 in one direction.For the present embodiment, wherein main circuit breaker 9 at least should can bear the disjunction voltage of 400kV, consider certain allowance, design according to disjunction 600kV, select the IGBT of two 4.5kV/1.6kA in parallel as a unit component, consider that the voltage that may occur in the shutoff moment is uneven, certain allowance to be left to the withstand voltage design of device, need 200 unit component series connection altogether, form an IGBT valve group, total number of devices is 400.All IGBT arranged direction are consistent.
Unidirectional direct-current circuit breaker 10 also comprises the speed-sensitive switch 11 and auxiliary circuit breaker 12 that are in series and connect, speed-sensitive switch 11 at least comprises a high-speed disconnecting switch, the conducting resistance of auxiliary circuit breaker 12 is less than main circuit breaker 9, and at least comprises a power semiconductor in one direction.For the present embodiment, high-speed disconnecting switch requires to have breaking speed faster, divides fracture of having no progeny can tolerate 600kV voltage.Auxiliary circuit breaker 12 selects the IGBT of two 4.5kV/1.6kA in parallel as a unit component, and form a valve group after needing 3 devices in series altogether, need 6 unit components altogether, total number of devices is 12.
Device 20 also comprises electric current commutation branch road A, B, C, D, wherein, commutation branch road A, B form the first brachium pontis that mid point is connected with brachium pontis mid point 3, and commutation branch road C, D form the second brachium pontis that mid point is connected with brachium pontis mid point 4, and two brachium pontis are all connected in parallel with Unidirectional direct-current circuit breaker 10.
Device 20 needs 4 commutation branch roads altogether, and the device of each branch road is identical.Each branch road comprises power semiconductor 7 and high-speed disconnecting switch 6.
Power semiconductor 7 bears very little disjunction voltage, needs little number of tandem.Power semiconductor 7 is chosen as the diode of 4.5kV/1.6kA, and in parallel again after needing 3 Diode series altogether, form a diode group, each branch road needs diode 6, and 4 groups of electric current commutation branch roads need 24 diodes altogether.The arranged direction of diode as shown in Figures 2 and 3.
Control method comprises the following steps:
Under normal circumstances, speed-sensitive switch 11 in described device 20 closes with auxiliary circuit breaker 12, high-speed disconnecting switch 6 in commutation branch road A, B, C, D and power semiconductor 7 close, power semiconductor 5 in main circuit breaker 9 closes, because auxiliary circuit breaker 12 only comprises 3 IGBT series connection, and main circuit breaker 9 comprises 200 IGBT series connection, auxiliary circuit breaker 12 has relatively minimum conducting resistance, and normal line current flows through auxiliary circuit breaker 12.The effect of commutation branch road A, B, C, D is: when making line current direction different, the sense of current flowing through main circuit breaker 9 is identical.If be first sense of current 14, electric current flows through commutation branch road A, D and auxiliary circuit breaker 12 place branch road, as shown in Figure 2; If be second sense of current 15, electric current flows through commutation branch road B, C and auxiliary circuit breaker 12 place branch road, as shown in Figure 3.
If-receiving the cut-off signal of described Unidirectional direct-current circuit breaker 10, first disjunction auxiliary circuit breaker 12, electric current will change to main circuit breaker 9;
Judge circuit 44 sense of current, if be first sense of current 14, disconnect the high-speed disconnecting switch 6 of commutation branch road B, C and the speed-sensitive switch 11 of auxiliary branch simultaneously; If be second sense of current 15, disconnect the high-speed disconnecting switch 6 of commutation branch road A, D and the speed-sensitive switch 11 of auxiliary branch simultaneously;
-after this, disconnect the main circuit breaker 9 of described Unidirectional direct-current circuit breaker 10, electric current will change to nonlinear resistance 13.
-high-speed disconnecting switch 6 being in closure state is disconnected, complete whole breaking course.
Above embodiment is only in order to illustrate that technical scheme of the present invention is not intended to limit; although after those skilled in the art reads the application; carry out various modifications or change with reference to this present invention of above-described embodiment, but these amendments or change are all within right application requirement protection range of the present invention is awaited the reply in application.

Claims (1)

1. make a control method for the device of line current disjunction, described device comprises Unidirectional direct-current circuit breaker;
Also comprise bridge-type branch road, described bridge-type branch road comprises two brachium pontis be made up of 4 identical commutation branch roads, described 4 commutation branch roads one group of series aiding connection between two, two brachium pontis formed carry out parallel connection again, and the series aiding connection that described each commutation branch road includes at least one the first power semiconductor connects; Two brachium pontis of described bridge-type branch road are all in parallel with Unidirectional direct-current circuit breaker, and the two ends of circuit connect the brachium pontis mid point of bridge-type branch road two brachium pontis respectively;
Described each commutation branch road also comprises at least one high-speed disconnecting switch, and described high-speed disconnecting switch is connected in the main line of commutation branch road;
Described device is connected in series to the current path of circuit with the brachium pontis mid point of two brachium pontis in bridge-type branch road; It is characterized in that: by the Unidirectional direct-current breaker closing in described device, the high-speed disconnecting switch in described bridge-type branch road and the first power semiconductor are closed, described method comprises the steps:
If-receive the cut-off signal of described Unidirectional direct-current circuit breaker, determine the first power semiconductor of the negative electrode that the brachium pontis that is connected with current input terminal is directly or indirectly connected with this current input terminal, disconnect the high-speed disconnecting switch of this first power semiconductor place commutation branch road; Determine the first power semiconductor of the anode that the brachium pontis that is connected with current output terminal is directly or indirectly connected with this current output terminal, disconnect the high-speed disconnecting switch of this first power semiconductor place commutation branch road;
-after this, disconnect described Unidirectional direct-current circuit breaker;
-high-speed disconnecting switch being in closure state is disconnected, complete whole breaking course.
CN201310039556.7A 2013-01-31 2013-01-31 A kind of device and control method thereof making line current disjunction Active CN103971965B (en)

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PCT/CN2013/090484 WO2014117608A1 (en) 2013-01-31 2013-12-26 Apparatus for breaking current of circuit and control method thereof

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