CN109428322A - Dc circuit breaker, the method and electric system for carrying out direct current interruption operation - Google Patents

Abstract

This disclosure relates to the method and electric system of dc circuit breaker, progress direct current interruption operation.Present disclose provides a kind of dc circuit breakers comprising first node, second node and oscillation circuit.Oscillation circuit includes: the main switch branch being connected between first node and second node parallel to each other and oscillation branch, main switch branch includes at least one electric power main switch, wherein electric power main switch itself cannot complete switch off the electric current by it, and oscillation branch includes at least capacitor；And oscillation turn-off module, its a part for being configured as main switch branch is simultaneously connected or is configured as a part of oscillation branch at least one electric power main switch and connect with capacitor, and be configured as forcing in the shutdown operating process of dc circuit breaker and generate the oscillating current that amplitude is gradually increased in oscillation circuit, so that the electric current by least one electric power main switch is finally completely switched off.

Description

Dc circuit breaker, the method and electric system for carrying out direct current interruption operation

Technical field

This disclosure relates to dc circuit breaker, the method for progress direct current interruption operation and the power train comprising dc circuit breaker System.

Background technique

Application for DC grid technology, dc circuit breaker, which becomes, guarantees stable, the safe and reliable operation of direct current system Important equipment.The electric current that the DC line where it is turned off when the failures such as short circuit can occur in systems for dc circuit breaker, from And excision or isolated fault.

As direct current is continuously increased for voltage and current in transmission system, typical switching device, such as mechanical switch, Air gap switch, half control type switching device such as thyristor etc. possibly can not independently turn off the electric current by it.In addition, some Although full-controlled switch device has certain turn-off capacity, maximum controllable current is less than in typical high-voltage direct current Rated current, thus cannot may also voluntarily turn off.Such switching device includes such as gate level turn-off thyristor (GTO), emit pole cut-off crystal brake tube (ETO), integrated gate commutated thyristor (IGCT) etc..Although in addition, these device energy Higher voltage is enough born, but itself can not turn off high current.

On the other hand, insulated gate bipolar thyristor (IGBT) although etc. switching devices can turn off biggish electricity Stream, but its pressure voltage is general lower (for example, several kilovolts), is not able to satisfy the demand (for example, tens kilovolts) of high-voltage switch gear.

In the breaker of the prior art, needs recharged capacitance and need to be pre-charged recharged capacitance to carry out Operation turns off making main circuit current zero passage.This causes circuit system increased costs, complicated for operation.

In addition, the dc circuit breaker of the prior art is long there are the turn-off time, in some cases even shutdown cannot wait it is scarce Point.Therefore, there is to improved dc circuit breaker, carry out the method and electric system of direct current interruption operation in the art Demand.

Summary of the invention

The first purpose of embodiment of the disclosure is intended to provide a kind of improved dc circuit breaker, carries out direct current interruption operation Method and electric system, can advantageously cut-off current.According to the present invention it is possible to high performance straight to be realized with a low cost The method for flowing breaker and direct current interruption operation, can provide high current controllability, and can be resistant to high voltage.

According to one aspect of the disclosure, a kind of dc circuit breaker (10) is provided, comprising: first node (A) and second Node (B)；Oscillation circuit (100), the oscillation circuit include: be connected to parallel to each other first node and second node it Between main switch branch (101) and oscillation branch (103), the main switch branch includes at least one electric power main switch (105), Wherein the electric power main switch itself cannot complete switch off the electric current by it, and the oscillation branch includes at least capacitor；With And oscillation turn-off module (107), it is configured as a part of the main switch branch and is opened at least one electric power master It closes series connection or is configured as a part of the oscillation branch and connects with the capacitor, and be configured as in the direct current It is forced in the shutdown operating process of breaker and generates the oscillating current (I ") that amplitude is gradually increased in the oscillation circuit, thus So that being finally completely switched off (I) by the electric current of at least one electric power main switch.

In one embodiment, the electric power main switch may include mechanical switch, air gap switch, half control type electric power Electronic switch or itself cannot complete switch off is switched by the full-control type power electronic of its electric current.

In one embodiment, the electric power main switch may include any one or more in following: based on machinery The switch module of switch, the switch module based on thyristor, the switch module based on air gap switch, the switch based on GTO Module, the switch module based on ETO, the switch module based on IGCT.

In one embodiment, the oscillation turn-off module includes full-control type power electronic switch, the breaking mould of the oscillation Block is configured as a part of the main switch branch and connects at least one electric power main switch.

In one embodiment, the oscillation turn-off module is made of one of the following: single full-control type power electronic Switch；Two full-control type power electronics switch of opposite direction connection；The half-bridge formed is switched by full-control type power electronic；By full-control type The full-bridge that electronic power switch is formed.

In one embodiment, the oscillation turn-off module can not include independent capacitor.

In one embodiment, the oscillation turn-off module can be with further include: switchs with corresponding full-control type power electronic Antiparallel diode.

In one embodiment, the full-control type power electronic switch can be switched with certain frequency, so that The oscillating current is generated in the oscillation circuit.

In one embodiment, the oscillation circuit can further include the inductance to cooperate with the capacitor.

In one embodiment, the frequency of oscillation of the oscillating current can the resonance frequency based on the oscillation circuit and Setting.

In one embodiment, the oscillation turn-off module may include fault current limiter.

In one embodiment, the oscillation turn-off module may include: the first inductor, be configured as the main switch A part of branch and at least one electric power main switch connect or be configured as it is described oscillation branch a part and with institute State capacitor series connection；And second inductor, separated with the oscillation circuit and with the first inductor magnetic coupling, wherein It is forced by the magnetic coupling of first inductor and the second inductor in the vibration via by the electric current of the second inductor It swings and generates the oscillating current that amplitude is gradually increased in circuit, so that the electric current of at least one electric power main switch described in is most It is completely switched off eventually.

In one embodiment, the dc circuit breaker can further include protective module, and the protective module is arranged to It is in parallel with the one or more in following: the oscillation turn-off module, the electric power main switch, the oscillation circuit, the master Switching branches, the oscillation branch and/or the capacitor.

In one embodiment, the dc circuit breaker can be with further include: is connected to the main switch branch circuit parallel connection Flow passage switch branch between first node (A) and second node (B), the flow passage switch branch include at least flow passage switch.

In one embodiment, the dc circuit breaker can be with further include: diode bridge comprising first to fourth 2 poles Pipe；And flow passage switch branch, the flow passage switch branch include at least flow passage switch；The wherein yin of the first and second diodes Pole is commonly connected to first node, and the anode of the first and second diodes is connected respectively to third node (C) and fourth node (D), wherein the anode of the third and fourth diode is commonly connected to second node (B), the cathode point of the third and fourth diode It is not connected to third node and fourth node, and wherein the flow passage switch branch is connected to the third node and Section four Point.In one embodiment, the dc circuit breaker can also include protective module, and the protective module is arranged to be couple to The third node and fourth node.

On one side according to the disclosure, a kind of electric system is provided, comprising: described in any item dc circuit breakers, with And be connected respectively with the first node and second node or the first line that is connected with the third node and fourth node and Power circuit, wherein the dc circuit breaker is suitable for occurring in the electric system turning off the power circuit when short circuit.

In one embodiment, the electric system can be with further include: is first power circuit and the second power line The device of a power supply in road, and/or electric power is received from one in first power circuit and the second power circuit Load.

On one side according to the disclosure, a kind of method for carrying out direct current interruption operation is provided, comprising: provide main switch branch Road, the main switch branch include at least one electric power main switch, wherein the electric power main switch its shutdown when its own not The electric current by it can be complete switched off；The oscillation branch with the main switch branch circuit parallel connection is provided, the oscillation branch at least wraps Include capacitor；There is provided oscillation turn-off module, be configured as a part of the main switch branch and at least one electric power master Switch series connection is configured as a part of the oscillation branch and connects with the capacitor；At least one described electricity of configuration Advocating to switch turns off it；And the configuration oscillation turn-off module come force in the oscillation circuit generation amplitude by Cumulative big oscillating current, so that being finally completely switched off by the electric current of at least one electric power main switch.

On one side according to the disclosure, a kind of method for carrying out direct current interruption operation is provided, comprising: provide main switch branch Road, the main switch branch include at least one electric power main switch, wherein the electric power main switch its shutdown when its own not The electric current by it can be complete switched off；The oscillation branch with the main switch branch circuit parallel connection is provided, the oscillation branch at least wraps Include capacitor；There is provided oscillation turn-off module, be configured as a part of the main switch branch and at least one electric power master Switch series connection is configured as a part of the oscillation branch and connects with the capacitor；And the configuration oscillation is disconnected Road module generates the oscillating current that is gradually increased of amplitude to force in the oscillation circuit, so that passing through described at least one The electric current of a electric power main switch is finally completely switched off, wherein at least one described electric power main switch is air gap switch or crystalline substance Thyristor switch.

In one embodiment, the electric power main switch includes mechanical switch, air gap switch, half control type power electronic It switchs or itself cannot complete switch off and switched by the full-control type power electronic of its electric current.

In one embodiment, the electric power main switch may include any one or more in following: based on machinery The switch module of switch, the switch module based on thyristor, the switch module based on air gap switch, the switch based on GTO Module, the switch module based on ETO, the switch module based on IGCT.

In one embodiment, the oscillation turn-off module may include full-control type power electronic switch, and the oscillation is disconnected Road module is configured as a part of the main switch branch and connects at least one described electric power main switch.

In one embodiment, the oscillation turn-off module can be made of one of the following: single full-control type electric power Electronic switch；Two full-control type power electronics switch of opposite direction connection；The half-bridge formed is switched by full-control type power electronic；By complete Control type power electronic switchs the full-bridge to be formed.

In one embodiment, the oscillation turn-off module can not include independent capacitor.

In one embodiment, the full-control type power electronic switch can be switched with certain frequency, so that The oscillating current is generated in the oscillation circuit.

In one embodiment, the oscillation branch or the main switch branch can further include cooperating with the capacitor Inductance.

In one embodiment, the frequency of oscillation of the oscillating current can the resonance frequency based on the oscillation circuit and Setting.

In one embodiment, the oscillation turn-off module may include fault current limiter.

In one embodiment, the oscillation turn-off module may include: the first inductor, be configured as the main switch A part of branch and at least one electric power main switch connect or be configured as it is described oscillation branch a part and with institute State capacitor series connection；And second inductor, separated with the oscillation circuit and with the first inductor magnetic coupling.It is described Method further include: compeled via the electric current for passing through the second inductor by the magnetic coupling of first inductor and the second inductor Make to generate the oscillating current that amplitude is gradually increased in the oscillation circuit, so that opening by least one electric power master The electric current of pass is finally completely switched off.

In one embodiment, the method can be with further include: protective module is provided, the protective module be arranged to One or more in following is in parallel: the oscillation turn-off module, the electric power main switch, the oscillation circuit, the master open Close branch, the oscillation branch and/or the capacitor.

In one embodiment, the method can be with further include: provides and is connected to the with the main switch branch circuit parallel connection Flow passage switch branch between one node (A) and second node (B), the flow passage switch module includes flow passage switch；And make The electric current for flowing through the flow passage switch is transferred to the main switch branch and the oscillation branch.

In one embodiment, the method can be with further include: provides diode bridge comprising first to fourth 2 poles Pipe；And flow passage switch branch is provided, the flow passage switch branch includes at least flow passage switch.The yin of first and second diodes Pole is commonly connected to first node, and the anode of the first and second diodes is connected respectively to third node (C) and fourth node (D).The anode of third and fourth diode is commonly connected to second node (B), and the cathode of the third and fourth diode connects respectively It is connected to third node and fourth node.The flow passage switch branch is connected to the third node and fourth node.The method It can be with further include: the electric current for flowing through the flow passage switch is made to be transferred to the main switch branch and the oscillation branch.The side Method can also include: offer protective module, and the protective module is arranged to be couple to the third node and fourth node.

Detailed description of the invention

Attached drawing forms part of this specification, and which depict the exemplary embodiments of the disclosure, and together with specification Principle for explaining the present invention together, in the accompanying drawings:

Fig. 1 shows the schematic diagram of the dc circuit breaker of one embodiment according to the disclosure；

Fig. 2A to 2C schematically shows the control letter of the dc circuit breaker of one embodiment according to the disclosure Number, electric current and voltage waveform；

Fig. 3 A shows the flow chart of the method for the progress direct current interruption operation according to one embodiment of the disclosure, Fig. 3 B Show the flow chart of the method for progress direct current interruption operation according to another embodiment of the present disclosure；

Fig. 4 shows the schematic diagram of dc circuit breaker according to another embodiment of the present disclosure；

Fig. 5 shows the schematic diagram of the dc circuit breaker of another embodiment according to the disclosure；

Fig. 6 shows the schematic diagram of the dc circuit breaker of the further embodiment according to the disclosure；

Fig. 7 shows the schematic diagram of the electric system including dc circuit breaker according to the embodiment of the present disclosure；

Fig. 8 shows the schematic diagram of dc circuit breaker according to another embodiment of the present disclosure；

Fig. 9 shows the schematic diagram of dc circuit breaker according to another embodiment of the present disclosure；And

Figure 10 shows the schematic diagram of dc circuit breaker according to another embodiment of the present disclosure.

Specific embodiment

Describe the specific embodiment of the disclosure in detail below in conjunction with attached drawing.It should be understood that only to the description of embodiment It is illustrative, is not the limitation to the application invention claimed in any sense.Unless otherwise expressly specified Either context or its principle are expressed or are implied, positioned opposite, the expression formula of component and step in the exemplary embodiment With numerical value etc. not as the limitation to the claimed invention of the application.

Term used herein, it is only for description specific embodiment, and it is not intended to limit the disclosure.On unless Hereafter clearly it is further noted that " one " of singular used herein and " described " intention equally include plural form.Also It is to be understood that one word of "comprising" as used herein, illustrates that there are pointed feature, entirety, step, operation, units And/or component, but it is not excluded that in the presence of or increase one or more of the other feature, entirety, step, operation, unit and/or group Part and/or their combination.In addition, mentioned " coupling/connection " in this application includes directly coupling and indirect coupling It connects；In other words, " A couple/be connected to B " or " A and B coupling/connection " includes A and B directly coupling/connection and A and B It is coupled indirectly/connects and there may be other intermediary elements between A and B.

In the disclosure, therefore term " offer " " it is right to provide certain from broadly by covering all modes for obtaining object As " including but not limited to " purchase ", " preparation/manufacture ", " arrangement/setting ", " installation/assembly ", and/or " order " object etc..

Here, the power switching device based on semiconductor is also referred to as electronic power switch device.

Fig. 1 shows the schematic diagram of the dc circuit breaker of one embodiment according to the disclosure.As shown in Figure 1, direct current is disconnected Road device 10 includes first node A and second node B and oscillation circuit 100 (indicating to meaning property as shown in phantom in Figure 1).Vibration Swinging circuit 100 may include the main switch branch 101 being connected between node A and node B parallel to each other and oscillation branch 103。

Main switch branch 101 may include at least one electric power main switch (it is also referred to as electric power main switch module) 105.Electric power main switch 105 may include that itself (that is, cannot voluntarily independently) cannot turn off the switch for flowing through its electric current (including but not limited to: mechanical switch, air gap switch, such as thyristor half control type switching device or its maximum can for device Cut-off current is less than some full-controlled switch devices (such as GTO, ETO, IGCT etc.) of the rated current of electric system) or its group It closes.In some embodiments, electric power main switch may include any one or more in following: the switching molding based on thyristor Block, the switch module based on air gap switch, the switch module based on GTO, the switch module based on ETO, based on IGCT's Switch module etc..

In accordance with an embodiment of the present disclosure, oscillation branch 103 can include at least capacitor C.Embodiment shown in Fig. 1 In, oscillation branch 103 includes capacitor C and the inductor to cooperate with capacitor.However the invention is not limited thereto, for example, with Any position in the oscillation circuit can be set in the inductance of the capacitor cooperation.Oscillation branch also may include capacitor and Inductance it is any appropriately combined, as long as it is with main switch branch and the oscillation turn-off module being described below forms oscillation i.e. It can.In some instances, inductance L may include the stray inductance in individual inductor and/or oscillation circuit.

Oscillating loop 100 further includes oscillation turn-off module 107.Oscillation turn-off module 107 can be configured as the master and open A part of branch 101 is closed, and is connected at least one described electric power main switch 105, as shown in fig. 1.Implement in others Example in, oscillation turn-off module 107 can be configured as it is described oscillation branch 103 a part, and with the capacitor C in series.

In one embodiment of the present disclosure, oscillation turn-off module 107 may include full-control type power electronic switching device. For example, oscillation turn-off module may include one or more full-control type power electronic switching devices, one or more of electric power Electronic switching device can be to form serial or parallel connection structure appropriate.For example, in the embodiment shown in fig. 1, oscillation open circuit Module 107 includes the IGBT module 109 based on insulated gate bipolar transistor (IGBT).In the embodiment shown in fig. 1, IGBT Module includes two IGBT (IGBT1 and IGBT2) of differential concatenation, and the diode D1 with each IGBT reverse parallel connection respectively And D2, to protect IGBT not to be reversed voltage breakdown.There is illustrated oscillations turn-off module (IGBT module therein in other words) Power switch (for example, IGBT) including two differential concatenations is to provide two-way on/off.It should be understood, however, that the disclosure can be with Suitable for including the case where the power switch of more or less such as IGBT；Such as one embodiment of the disclosure can wrap IGBT1 or IGBT2 are included to provide unidirectional on/off control.

It should also be understood that in other embodiments, oscillation turn-off module can be suitably based on other types of full-control type electricity Power electronic switching device.In addition, oscillation turn-off module is not limited to full-control type power electronic and opens as will be clarified in more detail later Close device.

In some embodiments, oscillation turn-off module can be made of (but being not limited to) one of the following: single full control Type electronic power switch；Two full-control type power electronics switch of opposite direction connection；Half formed is switched by full-control type power electronic Bridge；The full-bridge formed is switched by full-control type power electronic.

In some embodiments, oscillation turn-off module is arranged to not include independent capacitor.In this way, can be with low Cost realizes high performance breaker.

In some embodiments, oscillation turn-off module can also with other devices that cooperate of switch, such as with it is corresponding entirely Control type power electronic switchs antiparallel diode etc..

In the example depicted in fig. 1, oscillation turn-off module 107 is shown as being arranged in main switch branch 101, with electricity Advocate switch module 105 series connection.In that case it is preferable that oscillation turn-off module 107 is arranged in electric power main switch module 105 downstream.However the invention is not limited thereto.For example, in some embodiments, according to oscillation short block is differently composed or work Make mode, oscillation turn-off module also can be set in oscillation branch with capacitor C in series.

In certain embodiments, additional protective device can also be provided.For example, can provide and IGBT module parallel Protective module limits the voltage at IGBT module both ends, for absorbing energy to protect IGBT module to damage from overvoltage.Such as Shown in Fig. 1, protective module may include arrester or varistor, such as metal oxide varistor (MOV).Here, with MOV jointly indicates the protective module.In some cases, which is also referred to as energy absorbing module.However this Invent without being limited thereto, the protective device can also suitably constitute in other ways, for example, may include the electricity being connected in series Hinder device and capacitor.

In addition, in different embodiments, it can also be at electric power main switch both ends, the both ends of oscillating capacitor (such as C), vibration Swing circuit both ends, main switch branch both ends, oscillation branch both ends and/or integrally-built both ends installed protection device (for example, MOV), for absorbing energy and overvoltage protection.

Also shown in Fig. 1 the route (for example, power circuit or feeder cable) 111 being connect respectively with node A and B and 113.Multiple electric currents are also shown in Fig. 1, in which: electric current I indicates to pass through the electric current of main switch branch, electric current I ' expression power line Electric current (also referred to as main circuit current) in road, and electric current I " indicates the oscillating current generated in oscillation circuit.Note that although The direction of oscillating current I " is schematically shown in Fig. 1 with arrow, however oscillating current I " is in the different piece of cycle of oscillation In can flow in a reverse direction.

Oscillation turn-off module 107 is configured as forcing in the shutdown operating process of dc circuit breaker in oscillation circuit 100 The middle oscillating current I " for generating amplitude and being gradually increased, so that the electric current of at least one electric power main switch 105 described in is most It is completely switched off eventually.

When dc circuit breaker begins to turn off operation, the electric power main switch of the switches such as mechanical switch, ETO is actively carried out Shutdown or passive wait turn off, however its own cannot independently be complete switched off, and there are still the electric current for flowing through electric power main switch, examples Such as electric arc (for mechanical switch and air gap switch).The oscillation effect of turn-off module 107 produces in oscillation circuit 100 to force The oscillating current I " that raw amplitude is gradually increased.As oscillating current I " amplitude is gradually increased, the electric current for flowing through electric power main switch is fast It is reduced to one or manyly under the shutdown threshold value of electric power main switch fastly.As the skilled person will readily understand, For mechanical switch and air switch etc., it is zero that shutdown threshold value, which is usually electric current,；The half controls such as ETO or full control are opened It closes, shutdown threshold value can be value any appropriate or specified.In this way, making through at least one described electric power main switch 105 electric current is finally completely switched off.

Illustrate the operation of dc circuit breaker below with reference to embodiment shown in FIG. 1 and Fig. 2A to 2C.Fig. 2A to 2C difference Schematically show control signal, electric current and the voltage wave of the dc circuit breaker of the embodiment shown in FIG. 1 according to the disclosure Shape.It should be noted that two IGBT devices of IGBT1 and IGBT2 are provided in embodiment shown in FIG. 1, it is two-way to provide On/off.Here, only for IGBT2, as example, (IGBT1 remains shutdown at this time, and IGBT module is in a direction from left to right On/off) it is illustrated.The explanation can be readily applied to IGBT1, and (IGBT2 remains shutdown at this time, and IGBT module is from the right side On/off on direction to the left, i.e., reversed on/off) the case where.

Fig. 2A shows the control signal sent to IGBT2.Fig. 2 B shows the electric current I for flowing through electric power main switch and leads back Road electric current I '.Fig. 2 C shows between node A, B the voltage at (that is, dc circuit breaker or oscillation circuit both ends).

In system worked well, that is, before time t1 (the about 1ms in figure), electric power main switch is closed (that is, leading It is logical), the control signal of IGBT2 remains height, so that IBGT2 is connected, and therefore IGBT module is connected；In the case, it leads back Road (main line) electric current I ' flows through main switch branch 101 to downstream leg 113 from route 111.Between this period, node A and B The voltage at (that is, dc circuit breaker or oscillation circuit both ends) is almost equal to zero.

When breaking down (for example, short trouble), can configure electric power main switch 105 turns off it.For example, working as When electric power main switch is mechanical switch, it can be made by being separated from each other the contact of mechanical switch.When electric power main switch is complete When control type power electronic device, cut-off signals can be sent to electric power main switch.Note that this step is not for according to the present invention The dc circuit breakers of all embodiments be all necessary.It does not need to be configured (example to it when if turning off electric power main switch Such as, in the case where electric power main switch is thyristor or air gap switch), then it need not execute this step.

In case of a failure, can for example by IGBT module 109 send control signal, make IGBT module with Certain frequency is switched.

In IGBT module shutdown, electric current charges to capacitor C (and inductance L, if any) and (fills energy)；Later, IGBT module is connected again, capacitor C (and inductance L, if any) electric discharge, discharge current flow through electric power main switch module and IGBT module；It is thusly-formed oscillating current, as indicated by I ".

As illustrated in FIGURES 2 A-2 C, in the event of a failure, it can for example be mentioned from time t1 based on the detection to failure For the control signal of the IGBT2 of pulse (see Fig. 2A).When the control signal is 0, IGBT2 shutdown, electric current is in oscillation branch C (and L, if any) fill energy.When the control signal is 1, IGBT2 conducting, electric current flows through IGBT2, oscillating current I " also flows through IGBT2.In this way, to generate forced oscillation in oscillation circuit, and generated oscillating current amplitude is gradually Increase, as shown in Figure 2 B.The oscillating current flows in oscillation circuit, flows through electric power main switch, and equally flows through electric power master The rail current of switch is superimposed, so that the electric current (total current) for flowing through electric power main switch drops to one rapidly one or manyly Fixed threshold value or lower, so that electric power main switch be promoted to turn off.

In exemplary embodiment shown in fig. 2b, in time t2, main power switch current is (that is, it is disconnected to flow through oscillation The electric current of road module) drop under threshold value (here, about zero volt), and in time t3, be re-lowered under threshold value it is more, from And facilitate the shutdown of electric power main switch, that is, the electric current for flowing through main power switch is substantially zeroed.In time t1 to the period of time t3 In, with the switch motion of IGBT2, the voltage between node A and B fluctuates slightly, as shown in Figure 2 C.

It should be noted that being mechanical switch, air gap switch and such as thyristor half control type in electric power main switch In the case where electronic power switch, which can be zero.In other words, in the case, such electric power main switch can be It is turned off when flowing through its current zero-crossing point (one or many).It is that full-control type power electronic switch etc. has one in electric power main switch In the case where the switching device of fixed turn-off capacity, which can be greater than zero.Particularly, which can correspond to full-control type The maximum controllable current of electronic power switch.It is switched using the full-control type power electronic of the latter, cost can be effectively reduced, and Equally realize high turn-off performance.

IGBT module can be made suitably to switch by configuring the parameter of the control signal of IGBT, so that electric power master Switch can be turned off.For example, controlling opening for signal when electric power main switch is the switch such as mechanical switch, air gap switch It closes frequency and is configured such that electric power main switch can be turned off after the one or many zero crossings of electric current I.Preferably, The parameters such as switching frequency, the duty ratio of adjustable control signal, to realize the oscillation effect of optimization.Preferably, it can be based on The resonance frequency of oscillation circuit controls the switching frequency of signal to set, to configure the frequency of oscillation of oscillating current.Preferably, It can be on the basis of resonance frequency, according to desired oscillation effect (for example, the amplitude of generated oscillation, period, damping etc. Property) come further adjust control signal switching frequency.Moreover it is preferred that can according to desired frequency of oscillation (for example, According to the requirement for turning off electric power main switch), device cost, the factors such as device parameters (for example, loss resistance) properly select Capacitor C and inductor (if necessary), and the resonance frequency according to selected device in oscillation circuit in turn Rate controls the switching frequency of signal to determine.

In the case where (that is, after time t3) oscillation turn-off module 107 turns off and facilitates the shutdown of electronics main switch 105, Main circuit current I ' is gradually reduced (as shown in dotted line in Fig. 2 B), and to the capacitor of oscillation branch (and inductance, if there is or If it is considered that if stray inductance) charge/fill energy, so that the voltage at (that is, breaker both ends) gradually rises between node A and B, As shown in Figure 2 C.

Later, the energy for filling energy gradually dissipates, for example, partially due between capacitor C and main line (major loop) inductance Oscillation, as shown in Figure 2 C.

It will be understood by those skilled in the art that the explanation property of may also adapt to above be suitable for wherein vibrating turn-off module 107 be configured as it is described oscillation branch 103 a part and with the concatenated embodiment (not shown) of the capacitor 100.

Fig. 3 shows the flow chart of the method for the progress direct current interruption operation according to one embodiment of the disclosure.

In step 301, main switch branch (e.g., 101) are provided.The main switch branch includes at least one electric power main switch (e.g., 105), wherein the electric power main switch is in its shutdown, its own cannot complete switch off the electric current by it.

In step 303, provide with the oscillation branch of the main switch branch circuit parallel connection (e.g., 103), the oscillation branch is at least Including capacitor (e.g., C).Oscillation branch and main switch branch can be connected to parallel to each other between node A and node B, such as Shown in Fig. 1.

In step 305, oscillation turn-off module (e.g., 107) is provided, is configured as a part of the main switch branch simultaneously A part of the oscillation branch is connected or be configured as at least one electric power main switch and connect with the capacitor.

In step 307, configuring at least one described electronics main switch turns off it.Unrestricted show as one Example, can be based on the shutdown for carrying out main switch branch above in conjunction with mode described in Fig. 1.

In step 309, the oscillation turn-off module is configured to force the generation amplitude in the oscillation circuit to be gradually increased Oscillating current so that being finally completely switched off by the electric current of at least one electric power main switch.It is non-as one Restrictive example can be based on configuring the oscillation turn-off module above in conjunction with mode described in Fig. 1, and to pass through institute The electric current for stating at least one electric power main switch is finally completely switched off.

Fig. 3 B shows the flow chart of the method for progress direct current interruption operation according to another embodiment of the present disclosure.

In step 302, main switch branch is provided, the main switch branch includes at least one electric power main switch, wherein institute Stating electric power main switch, its own cannot complete switch off the electric current by it in its shutdown.In this embodiment, described at least one A electric power main switch can be air gap switch or thyristor switch.As previously described, for such as air gap switch or The power switch of thyristor switch, it may not be necessary to the operation for configuring such power switch to turn off it.

In step 304, the oscillation branch with the main switch branch circuit parallel connection is provided, the oscillation branch includes at least capacitor Device.

In step 306, oscillation turn-off module is provided, is configured as a part of the main switch branch and at least one A electric power main switch series connection is configured as a part of the oscillation branch and connects with the capacitor.

In step 308, the oscillation turn-off module is configured to force the generation amplitude in the oscillation circuit to be gradually increased Oscillating current so that being finally completely switched off by the electric current of at least one electric power main switch.

It should be understood that the step of method as described herein is not restrictive, and certain steps can be with other steps Suddenly it simultaneously, or before or after other steps carries out.It is carried out in addition, certain steps can split into multiple sub-steps, Or a step can be merged into execute.

It is also understood that can suitably appoint with taught in the disclosure here in conjunction with method described in Fig. 3 A and 3B Embodiment of anticipating combination is to apply.

Fig. 4 shows the schematic diagram of dc circuit breaker 40 according to another embodiment of the present disclosure.Dc circuit breaker 40 Structure and dc circuit breaker 10 shown in FIG. 1 it is essentially identical, difference essentially consist in its vibrate turn-off module limited by failure Stream device is formed.Therefore, similarly or adaptively it can be suitable for this above in conjunction with the description of Fig. 1,2A-2C and 3A and 3B Embodiment.

As shown in figure 4, dc circuit breaker 40 includes oscillation circuit 400, oscillation circuit 400 includes being connected to node A and section Main switch branch 401 and oscillation branch 403 between point B.Main switch branch 401 may include at least one electric power main switch. Vibrating branch 403 may include the capacitor C and inductance L (if necessary) to cooperate with capacitor.

Oscillating loop 400 further includes oscillation turn-off module 407.Oscillation turn-off module 407 can be configured as the master and open A part of branch 401 is closed, and is connected at least one described electric power main switch 105, as shown in Figure 4.Alternatively, oscillation open circuit Module 407 can be configured as it is described oscillation branch 403 a part, and with the capacitor C in series.

In this embodiment, oscillation turn-off module 407 is made of fault current limiter.As an example, implementation shown in Fig. 4 Superconductive current limiter can be used in example.In other embodiments, positive temperature coefficient thermistor (PTC) current limliting can also be used Device, saturation reactance current limiter etc..Similarly, oscillation turn-off module 407 is configured as operating in the shutdown of the dc circuit breaker It forces in the process and generates the oscillating current (I ") that amplitude is gradually increased in the oscillation circuit, so that described at least The electric current of one electric power main switch is finally completely switched off (I).

In systems in operation, electric power main switch is closed (conducting), and superconductive current limiter is configured in superconducting state (electricity Resistance is zero or is close to zero).When breaking down or detecting failure, configuration electric power main switch turns off it.Note that It does not need to configure it (for example, being that thyristor or the air gap are opened in electric power main switch when if turning off electric power main switch In the case where pass), then it need not execute this step.Superconductive current limiter is controlled, makes it with certain frequency in superconducting state and normal state Switch between (resistance is not zero).In systems in operation, superconductive current limiter is in superconducting state, the electricity at superconductive current limiter both ends It presses substantially zeroed.When superconductive current limiter is switched to normal state, since it is with certain resistance, superconductive current limiter both ends (shake Swing turn-off module both ends) certain voltage is correspondingly generated, capacitor (and inductance, if any) charge/fill energy. Later, superconductive current limiter is switched to superconducting state again, reverts to the voltage at its both ends substantially zeroed, capacitor (and inductance, such as If fruit has) it discharges and passes through electric power main switch module and superconductive current limiter.In this way, making the generation forced oscillation in oscillation circuit It swings, to generate the increased oscillating current of amplitude.The oscillating current is superimposed with main circuit current, so that flowing through electric power main switch Electric current can descend to certain threshold value or in the process hereinafter, to promote electric power main switch to turn off.

It is similar with Fig. 1, the power circuit 411 and 413 connecting with node A and B is also shown in Fig. 4.

Fig. 5 shows the schematic diagram of dc circuit breaker 50 according to another embodiment of the present disclosure.Dc circuit breaker 50 Structure and dc circuit breaker 10 and 40 above-mentioned it is essentially identical, difference essentially consist in its vibrate turn-off module by mutual inductance line Circle is formed.Therefore, the description above in conjunction with Fig. 1,2A-2C, 3A-3B and 4 can similarly or adaptively be suitable for this reality Apply example.

As shown in figure 5, dc circuit breaker 50 includes oscillation circuit 500.Oscillation circuit 500 includes being connected to parallel to each other Main switch branch 501 and oscillation branch 503 between node A and node B.Main switch branch 501 may include at least one electricity Advocate to switch.In the embodiment shown in fig. 5, using GTO as electric power main switch.As has been noted, it can also adopt Use other other switching devices that cannot voluntarily turn off the electric current for flowing through it as the electric power main switch.Vibrate branch 503 to It less include capacitor C.

Oscillation circuit 500 further includes oscillation turn-off module 507.In this embodiment, as shown in figure 5, oscillation turn-off module 507 include that the mutual inductance inductor M being magnetically coupling to one another is constituted, and mutual inductance inductor M includes the inductor L1 and electricity for forming mutual inductance each other Sensor L2.It is connect in oscillation branch with capacitor C in series as shown in figure 5, inductor L1 can be set, inductor L2 can connect It is connected to outside.Electric current appropriate suitably for example can be generated in inductor L2 by external power supply (such as pulse power) (for example, oscillating current with certain frequency and amplitude), by the mutual inductance (magnetic coupling) of inductor L1 and L2, forces in institute It states and generates the oscillating current (I ") that amplitude is gradually increased in oscillation circuit, so that passing through at least one described electric power main switch Electric current be finally completely switched off (I).

Note that inductor L1 can connect in oscillation circuit any can make to generate the appropriate of oscillating current in circuit Position, connect for example, it is also possible to be arranged in main switch branch with electric power main switch 505.According to different instances, oscillation circuit In can utilize there may also be other separate inductor or additionally by the stray inductance (not shown) in oscillation circuit.

It is similar with Fig. 1, the power circuit 511 and 513 connecting with node A and B is also shown in Fig. 5.

Fig. 6 shows the schematic diagram of dc circuit breaker according to another embodiment of the present disclosure.Direct current shown in fig. 6 is disconnected The structure of road device 60 and the structure of dc circuit breaker 10 shown in FIG. 1 are essentially identical, the difference is that, dc circuit breaker 60 is also Including other switching branches, such as flow passage switch branch 615.It can be similarly or suitable above in conjunction with the explanation of other embodiments It is suitable for the present embodiment to answering property.

As shown in fig. 6, dc circuit breaker 60 includes oscillation circuit 600.Oscillation circuit 600 includes being connected to parallel to each other Main switch branch 601 and oscillation branch 603 between node A and node B.Main switch branch 601 may include at least one electricity Advocate switch 605.It vibrates branch 603 and includes at least capacitor C.Oscillation circuit 600 further includes oscillation turn-off module 607.Above Corresponding component shown in fig. 6 and structure can be equally applicable to regard to Fig. 1 explanation carried out.

Dc circuit breaker 60 further includes flow passage switch branch 615.Flow passage switch branch 615 may include flow passage switch, with It and in certain embodiments further include current converter.In system worked well, main circuit current (namely rail current) passes through Flow passage switch branch (flow passage switch) flows through.Flow passage switch can be mechanical switch, thyristor etc..It is preferred that being made using mechanical switch For flow passage switch, this is because the on state resistance of mechanical switch is lower, thus the on-state loss of system can be reduced.Here, it changes Flowing device can be using known in the art or exploitation in the future any appropriate current converter.

In this embodiment, it when dc circuit breaker carries out open-circuit operation, will for example can be flowed through using current converter logical The electric current of stream switch is transferred to oscillation circuit 600.Oscillation circuit 600 can be similar to describe with upper combination previous embodiment Operation turns off the electric current, to realize the shutdown to main circuit current.Here, the main power switch 605 in main switch branch 601 It can include but is not limited to the devices such as air gap switch, thyristor or full-control type power electronic switch.Preferably, main electric power is opened Closing 605 includes electronic power switch, it is highly preferred that including that full-control type power electronic switchs.

When system worked well, main circuit current flows through flow passage switch.When a failure occurs it or detecting failure, close Disconnected flow passage switch 615, and so that the electric current for flowing through flow passage switch is transferred to main switch branch, such as pass through current converter.Configuration electricity Advocating to switch turns off it.Note that not needing to configure it (for example, in electric power when if turning off electric power main switch In the case that main switch is thyristor or air gap switch), then it need not execute this step.As previously described, disconnected by vibrating Road module forces and generates the oscillating current (I ") that amplitude is gradually increased in the oscillation circuit, so that described at least The electric current of one electric power main switch is finally completely switched off (I).

Although showing example of the IGBT module as oscillation turn-off module in Fig. 6, it should be appreciated that can be suitably used Above in conjunction with the various oscillation turn-off modules of different embodiments description.The feature of different embodiments in the disclosure can be suitably It is combined with each other.

It should also be understood that according to different instances, there may also be other separate inductors or can be another in oscillation circuit Other places is using by the stray inductance (not shown) in oscillation circuit.It is similar with Fig. 1, it also shows in Fig. 6 and is connect with node A and B Power circuit 611 and 613.

Fig. 7 shows the schematic diagram of the electric system including dc circuit breaker according to the embodiment of the present disclosure.According to this public affairs The dc circuit breaker for opening various different embodiments can be adapted for direct current power system, to occur such as in direct current power system The electric current of the power circuit or system where it is turned off when the failures such as short circuit, thus excision or isolated fault.Therefore, according to this public affairs It opens, additionally provides a kind of electric system, show to property as schematically shown in Figure 7.Electric system 70 may include: according to above-mentioned any The dc circuit breaker of embodiment description, and the power circuit being connected respectively with the first node and second node, wherein institute Dc circuit breaker is stated to be suitable for occurring in the electric system turning off the power circuit when short circuit.Electric system 70 can also wrap It includes: for the device 701 of one in first power circuit and the second power circuit power supply, and/or from first electric power The load 703 of a reception electric power in route and the second power circuit.The example of power supply unit 701 can include but is not limited to Any suitable power supply unit, such as various confession/transformer equipments or generating equipment etc..Load 703 example may include but Be not limited to any downstream transformer equipment and any equipment for receiving electric power.

Fig. 8 shows the schematic diagram of dc circuit breaker according to another embodiment of the present disclosure.As shown in figure 8, direct current Breaker 80 includes oscillation circuit 800.Oscillation circuit 800 includes that the master being connected between node A and node B parallel to each other opens Close branch 801 and oscillation branch 803.Route 811 and 813 is connected respectively to node A and node B.

Main switch branch 801 may include at least one electric power main switch 805.Here, electric power main switch module 805 executes Unidirectional on/off may include the electric power main switch of unidirectional on/off, such as thyristor, GTO, IGCT.Vibrate branch 803 at least Including capacitor C (also showing optional inductor L in figure).Oscillation circuit 800 further includes oscillation turn-off module 807.At this In embodiment, oscillation turn-off module 807, which can be, is capable of unidirectional on/off.

Dc circuit breaker 60 further includes flow passage switch branch 815.Flow passage switch branch 815 may include flow passage switch, with It and in certain embodiments further include current converter.

In this embodiment, it when dc circuit breaker carries out open-circuit operation, will for example can be flowed through using current converter logical The electric current of stream switch is transferred to oscillation circuit 800.Oscillation circuit 800 can be similar to describe with upper combination previous embodiment Operation turns off the electric current, to realize the shutdown to main circuit current.Here, the main power switch 805 in main switch branch 801 It can unidirectional on/off.

When system worked well, main circuit current flows through flow passage switch.When a failure occurs it or detecting failure, close Disconnected flow passage switch 815, and so that the electric current for flowing through flow passage switch is transferred to main switch branch, such as by current converter come the change of current. Configuration electric power main switch turns off it.

Similar described in Fig. 2A -2C above in conjunction, oscillation turn-off module 807 can for example be turned off, thus Electric current carries out filling energy to oscillation branch 803, so that the voltage at capacitor both ends increases.Later, oscillation turn-off module becomes being connected, Branch electric discharge is vibrated, so that oscillating current flows through electric power main switch 805 and oscillation turn-off module 807.Later, turn-off module is vibrated It turns off again.

In this way, forcing the oscillating current for generating amplitude in the oscillation circuit and being gradually increased by vibrating turn-off module (I "), so that being finally completely switched off (I) by the electric current of at least one electric power main switch.

The explanation carried out above with regard to other embodiments can be suitably applicable to corresponding component shown in Fig. 8 and structure.

Fig. 9 shows the schematic diagram of dc circuit breaker according to another embodiment of the present disclosure.As shown in figure 9, direct current Breaker 90 includes oscillation circuit 900.Oscillation circuit 900 includes that the master being connected between node A and node B parallel to each other opens Close branch 901 and oscillation branch 903.Main switch branch 901 may include at least one electric power main switch 905.Vibrate branch 903 Including at least capacitor C (also showing optional inductor L in figure).Oscillation circuit 900 further includes oscillation turn-off module 907. Dc circuit breaker 90 further includes flow passage switch branch 915.Flow passage switch branch 915 may include flow passage switch, and certain It further include current converter (change of current mechanism) in embodiment.Route 911 and 913 is connected respectively to node A and node B.

The structure of dc circuit breaker 90 shown in Fig. 9 is similar with dc circuit breaker 80 shown in Fig. 8, the difference is that its Electric power main switch 905 executes two-way on/off, and oscillation turn-off module 807 is also the module for being able to carry out two-way on/off.

Similar in its embodiment for operating Fig. 2A -2C above in conjunction, details are not described herein.

Figure 10 shows the schematic diagram of dc circuit breaker according to another embodiment of the present disclosure.As shown in Figure 10, directly Flowing breaker 1000 includes oscillation circuit, and the oscillation circuit includes the master being connected between node A and node B parallel to each other Switching branches 1001 and oscillation branch 1003.Main switch branch 1001 may include at least one electric power main switch 1005.Oscillation Branch 1003 includes at least capacitor C (optional inductor L is also shown in figure).Oscillation circuit 1000 further includes oscillation open circuit Module 1007.

Here, electric power main switch 1005 executes unidirectional on/off, and vibrate turn-off module 1007 can be able to carry out it is unidirectional Or the module of two-way on/off.

Dc circuit breaker 1000 further includes flow passage switch branch 1015.Flow passage switch branch 1015 is connected to node C and D. Here, node C and D can be connected respectively to external route 1011 and route 1013.Similarly, flow passage switch branch 1015 can It to include flow passage switch, and in certain embodiments further include current converter.

The dc circuit breakers of dc circuit breaker shown in Fig. 10 1000 and other embodiments the difference is that: further include The diode bridge formed by diode D1-D4, the both ends of diode bridge are connected respectively to node C and D；Including the master being connected in parallel to each other The oscillation circuit of switching branches 1001 and oscillation branch 1003 is placed across the Liang Ge branch of diode bridge.

Diode D1 and D2 opposite direction arrangement, cathode are commonly connected to node A, and anode is connected respectively to node C and D. And diode D3 and D4 reversed arrangement, anode are commonly connected to node B, cathode is connected respectively to node C and D.It should be understood that The arrangement of diode bridge is not limited to embodiment shown in Figure 10.It should also be understood that diode D1-D4 each may include single Diode or multiple diodes of series connection.

The present embodiment can be suitably suitable for regard to content described in other embodiments above.

According to this embodiment, can use unidirectional electric power main switch and mono-/bis-to oscillation short block realize it is double To the breaker of on/off, so as to further reduce the cost.

So far, it is also to be understood that the disclosure further correspondingly provides the method for carrying out direct current interruption operation.

A kind of method for carrying out direct current interruption operation of project 1., comprising:

Main switch branch is provided, the main switch branch includes at least one electric power main switch, wherein the electric power master opens Its own cannot complete switch off the electric current by it when Guan Qi is turned off；

The oscillation branch with the main switch branch circuit parallel connection is provided, the oscillation branch includes at least capacitor；

Oscillation turn-off module is provided, a part of the main switch branch is configured as and is opened at least one electric power master It closes series connection or is configured as a part of the oscillation branch and connects with the capacitor；

Configuring at least one described electric power main switch turns off it；And

It configures the oscillation turn-off module and generates the oscillating current that is gradually increased of amplitude in the oscillation circuit to force, So that being finally completely switched off by the electric current of at least one electric power main switch.

A kind of method for carrying out direct current interruption operation of project 2., comprising:

Main switch branch is provided, the main switch branch includes at least one electric power main switch, wherein the electric power master opens Its own cannot complete switch off the electric current by it when Guan Qi is turned off；

The oscillation branch with the main switch branch circuit parallel connection is provided, the oscillation branch includes at least capacitor；

Oscillation turn-off module is provided, a part of the main switch branch is configured as and is opened at least one electric power master It closes series connection or is configured as a part of the oscillation branch and connects with the capacitor；And

It configures the oscillation turn-off module and generates the oscillating current that is gradually increased of amplitude in the oscillation circuit to force, So that be finally completely switched off by the electric current of at least one electric power main switch,

Wherein at least one described electric power main switch is air gap switch or thyristor switch.

Method of the project 3. as described in project 1 or 2, wherein the electric power main switch includes that mechanical switch, the air gap are opened It closes, half control type electronic power switch or itself cannot complete switch off is switched by the full-control type power electronic of its electric current.

Method of the project 4. as described in project 1 or 2, wherein the electric power main switch include in following any one or it is more Kind:

Switch module based on mechanical switch, the switch module based on thyristor, the switching molding based on air gap switch Block, the switch module based on GTO, the switch module based on ETO, the switch module based on IGCT.

Method of the project 5. as described in project 1 or 2, wherein the oscillation turn-off module includes that full-control type power electronic is opened Close, it is described oscillation turn-off module be configured as the main switch branch a part and at least one described electric power main switch string Connection.

Method of the project 6. as described in project 1 or 2, wherein the oscillation turn-off module is made of one of the following:

Single full-control type power electronic switch；

Two full-control type power electronics switch of opposite direction connection；

The half-bridge formed is switched by full-control type power electronic；

The full-bridge formed is switched by full-control type power electronic.

Dc circuit breaker of the project 7. as described in project 5 or 6, wherein the oscillation turn-off module does not include independent capacitor Device.

Method of the project 8. as described in project 5 or 6, wherein full-control type power electronic switch is opened with certain frequency It closes, so that generating the oscillating current in the oscillation circuit.

Method of the project 9. as described in project 1 or 2, wherein the oscillation branch or the main switch branch further include and institute State the inductance of capacitor cooperation.

Method of the project 10. as described in project 1 or 2, wherein the frequency of oscillation of the oscillating current is based on described vibrate back The resonance frequency on road and set.

Method of the project 11. as described in project 1 or 2, wherein the oscillation turn-off module includes fault current limiter.

Method of the project 12. as described in project 1 or 2, wherein the oscillation turn-off module includes:

First inductor, be configured as a part of the main switch branch and connect at least one electric power main switch or Person is configured as a part of the oscillation branch and connects with the capacitor；And

Second inductor, separated with the oscillation circuit and with the first inductor magnetic coupling,

The method also includes: via the electric current for passing through the second inductor, pass through first inductor and the second inductance The magnetic coupling of device forces and generates the oscillating current that amplitude is gradually increased in the oscillation circuit, so that described in extremely The electric current of a few electric power main switch is finally completely switched off.

Method of the project 13. as described in project 1 or 2, further includes:

There is provided protective module, the protective module be arranged to it is following in one or more it is in parallel: it is described oscillation break Road module, the electric power main switch, the oscillation circuit, the main switch branch, the oscillation branch and/or the capacitor Device.

Method of the project 14. as described in project 1 or 2, further includes:

There is provided and the main switch branch circuit parallel connection be connected between first node (A) and second node (B) through-flow open Branch is closed, the flow passage switch module includes flow passage switch；And

The electric current for flowing through the flow passage switch is set to be transferred to the main switch branch and the oscillation branch.

Method of the project 15. as described in project 1 or 2, further includes:

There is provided diode bridge comprising first to fourth diode；And

Flow passage switch branch is provided, the flow passage switch branch includes at least flow passage switch；

Wherein the cathode of the first and second diodes is commonly connected to first node, the anode point of the first and second diodes It is not connected to third node (C) and fourth node (D),

Wherein the anode of the third and fourth diode is commonly connected to second node (B), the yin of the third and fourth diode Pole is connected respectively to third node and fourth node, and

Wherein the flow passage switch branch is connected to the third node and fourth node；

And

The electric current for flowing through the flow passage switch is set to be transferred to the main switch branch and the oscillation branch.

Method of the project 16. as described in project 15, further includes:

Protective module is provided, the protective module is arranged to be couple to the third node and fourth node.

In accordance with an embodiment of the present disclosure, compared with the breaker of the prior art, recharged capacitance is not needed, it is disconnected by oscillation The on/off of road module can produce oscillation.

In addition, in accordance with an embodiment of the present disclosure, the amplitude of oscillating current can be increasing, be conducive to mechanical switch/crystalline substance lock Pipe repeatedly experience zero crossing shutdown.

In addition, in accordance with an embodiment of the present disclosure, oscillation turn-off module can open shutdown repeatedly to form resonance, therefore institute The capacitance of the capacitor C needed is very low.For example, only being needed according to some embodiments of the present disclosure for the breaker of 40kV/20kA To use the capacitor of 3uF or so.And the existing of turn-off technique is repeatedly wherein opened without using of the invention for same specification The breaker of technology, then the capacitance typically needs 100uF or more.To which the present invention is greatly reduced to the harsh of capacitor It is required that greatly reducing cost.

The various embodiments of the disclosure are described above, but above description is only exemplary, and exhaustive Property, and present invention is also not necessarily limited to disclosed various embodiments.Each embodiment and its feature disclosed herein can be any Combination, without departing from the spirit and scope of the present invention.Introduction in this according to the present invention, the ordinary skill people of correlative technology field Member is easily envisaged that many modifications and variations, these modifications and variations are also included within the spirit and scope of the present invention.

Claims (18)

1. a kind of dc circuit breaker (10), comprising:

First node (A) and second node (B)；

Oscillation circuit (100), the oscillation circuit include:

The main switch branch (101) being connected between first node and second node parallel to each other and oscillation branch (103), The main switch branch includes at least one electric power main switch (105), wherein the electric power main switch itself cannot complete switch off By its electric current, the oscillation branch includes at least capacitor；And

Vibrate turn-off module (107), be configured as a part of the main switch branch and at least one electric power master Switch series connection is configured as a part of the oscillation branch and connects with the capacitor, and is configured as described straight It flows to force in the shutdown operating process of breaker and generates the oscillating current (I ") that amplitude is gradually increased in the oscillation circuit, from And finally to be completely switched off (I) by the electric current of at least one electric power main switch.

2. dc circuit breaker as described in claim 1, wherein the electric power main switch includes that mechanical switch, the air gap are opened It closes, half control type electronic power switch or itself cannot complete switch off is switched by the full-control type power electronic of its electric current.

3. dc circuit breaker as described in claim 1, wherein the electric power main switch include in following any one or it is more Kind:

Switch module based on mechanical switch, the switch module based on thyristor, the switch module based on air gap switch, base Switch module in GTO, the switch module based on ETO, the switch module based on IGCT.

4. dc circuit breaker as described in claim 1, wherein the oscillation turn-off module includes full-control type power electronic switch, The oscillation turn-off module is configured as a part of the main switch branch and connects at least one electric power main switch.

5. dc circuit breaker as described in claim 1, wherein the oscillation turn-off module is made of one of the following:

Single full-control type power electronic switch；

Two full-control type power electronics switch of opposite direction connection；

The half-bridge formed is switched by full-control type power electronic；

The full-bridge formed is switched by full-control type power electronic.

6. dc circuit breaker as described in claim 4 or 5, wherein the oscillation turn-off module does not include independent capacitor.

7. dc circuit breaker as described in claim 4 or 5, wherein the oscillation turn-off module further include: with corresponding full control The antiparallel diode of type electronic power switch.

8. dc circuit breaker as described in claim 4 or 5, wherein full-control type power electronic switch is carried out with certain frequency Switch, so that generating the oscillating current in the oscillation circuit.

9. dc circuit breaker as described in claim 1, wherein the oscillation circuit further includes the electricity to cooperate with the capacitor Sense.

10. dc circuit breaker as described in claim 1, wherein the frequency of oscillation of the oscillating current is based on the oscillation circuit Resonance frequency and set.

11. dc circuit breaker as described in claim 1, wherein the oscillation turn-off module includes fault current limiter.

12. dc circuit breaker as described in claim 1, wherein the oscillation turn-off module includes:

First inductor, be configured as a part of the main switch branch and connect at least one electric power main switch or by It is configured to a part of the oscillation branch and connects with the capacitor；And

Second inductor, separated with the oscillation circuit and with the first inductor magnetic coupling,

Wherein forced via by the electric current of the second inductor by the magnetic coupling of first inductor and the second inductor The oscillating current that amplitude is gradually increased is generated in the oscillation circuit, so that passing through at least one described electric power main switch Electric current be finally completely switched off.

13. dc circuit breaker as described in claim 1, further includes:

Protective module, the protective module be arranged to it is following in one or more it is in parallel: the oscillation turn-off module, institute State electric power main switch, the oscillation circuit, the main switch branch, the oscillation branch and/or the capacitor.

14. dc circuit breaker as described in claim 1, further includes:

The flow passage switch branch being connected to the main switch branch circuit parallel connection between first node (A) and second node (B), institute Flow passage switch branch is stated including at least flow passage switch.

15. dc circuit breaker as described in claim 1, further includes:

Diode bridge comprising first to fourth diode；And

Flow passage switch branch, the flow passage switch branch include at least flow passage switch；

Wherein the cathode of the first and second diodes is commonly connected to first node, and the anode of the first and second diodes connects respectively It is connected to third node (C) and fourth node (D),

Wherein the anode of the third and fourth diode is commonly connected to second node (B), the cathode point of the third and fourth diode It is not connected to third node and fourth node, and

Wherein the flow passage switch branch is connected to the third node and fourth node.

16. dc circuit breaker as claimed in claim 15, further includes:

Protective module, the protective module are arranged to be couple to the third node and fourth node.

17. a kind of electric system, comprising:

Dc circuit breaker as described in any one of claim 1-16, and

The first line for being connected respectively with the first node and second node or being connected with the third node and fourth node And power circuit,

Wherein the dc circuit breaker is suitable for occurring in the electric system turning off the power circuit when short circuit.

18. electric system as claimed in claim 17, further includes:

For the device of one in first power circuit and the second power circuit power supply, and/or

From the load of a reception electric power in first power circuit and the second power circuit.