CN107294054A - A kind of topological structure of the quick mixed type dc circuit breaker of both arms framework - Google Patents
A kind of topological structure of the quick mixed type dc circuit breaker of both arms framework Download PDFInfo
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- CN107294054A CN107294054A CN201710492596.5A CN201710492596A CN107294054A CN 107294054 A CN107294054 A CN 107294054A CN 201710492596 A CN201710492596 A CN 201710492596A CN 107294054 A CN107294054 A CN 107294054A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency 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
- H02H3/087—Emergency 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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency 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
- H02H3/10—Emergency 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 additionally responsive to some other abnormal electrical conditions
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/268—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured for dc systems
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Abstract
The invention discloses a kind of topological structure of the quick mixed type dc circuit breaker of both arms framework, in Bridge 1 arm, main circuit breaker A1Unidirectional solid-state switch group of the series connection with anti-paralleled diode of branch route is constituted, and primary current leg is by Fast mechanical switch A3With two-way load transfer solid-state A2Switch is in series, and energy afterflow absorption circuit is by a non-linear bleeder resistance A5With fly-wheel diode group A4Series connection, and in A4One in parallel of two ends are by diode A6With Fast mechanical switch A7Constitute series arm；In Bridge 2 arm, main circuit breaker B1Unidirectional solid-state switch group of the series connection with anti-paralleled diode of branch route is constituted, and primary current leg is by Fast mechanical switch B3With two-way load transfer solid-state switch B2It is in series.The present invention can close, carry and cut-off the electric current under normal loop condition, and can close, carry and cut-off the electric current under abnormal loop condition within the defined time, improve practical engineering application.
Description
Technical field
The present invention relates to circuit field, and in particular to a kind of topology knot of the quick mixed type dc circuit breaker of both arms framework
Structure.
Background technology
With the gradually development of high-tension electricity potential source code converter and defeated (matching somebody with somebody) power technology of multiterminal flexible direct current, fast-speed direct current breaks
Road device is one of engineering key application equipment of defeated (matching somebody with somebody) power network of direct current, need at the appointed time carry and cut-off direct current network
Normal current and various fault currents, are operation, control and protection basis that defeated (matching somebody with somebody) electric networkization of direct current is built.
High voltage DC breaker faces significant challenge：DC current does not have natural zero-crossing point, and direct-current arc is difficult to extinguish；Open
After disconnected DC current, very big overvoltage can be produced, while a large amount of energy demands stored in straight-flow system are absorbed；Direct current system
Impedance (there was only resistance during stable state) of uniting is much smaller than AC system, its short-circuit current will it is rapid in several milliseconds on
Rise, in the accurate failure judgement of Millisecond and short circuit current flow need to be cut-off.
With the development of Power Electronic Technique and Fast mechanical switch technology, straight-flow system is met now and cut-offs the disconnected of requirement
Road device mainly has three kinds of schemes：Artificial zero passage point breaker based on Fast mechanical switch, the solid-state based on Power Electronic Technique
Breaker, the hybrid dc circuit breaker based on Power Electronic Technique and Fast mechanical switch technology, by these four schemes with it
Preceding described tradition machinery formula breaker is compared, as shown in table 1 below：
1 four kinds of dc circuit breaker advantage and disadvantage of table compare
The mixed type direct-current breaker topology knot based on Quick mechanical disconnecting switch and electronic power switch that ABB is proposed
Structure scheme causes dc circuit breaker to obtain breakthrough, is switched during normal operation by Quick mechanical disconnecting switch and load transfer
Primary current leg is constituted, electric current is transferred to the two-way solid-state switch group being connected in parallel during failure by switching off load change-over switch
Branch road；Turn off quick isolation switch rapidly when primary current leg electric current is reduced to zero, so as to protect load transfer to switch, be it
Primary voltage isolation is set up in integrated circuit；By turning off two-way solid-state switch group, fault current is transferred to lightning arrester connected in parallel,
Reach solution overvoltage and absorb energy purpose, so as to realize that DC current is turned off, with quick, reliable and almost zero loss
Advantage.But there is subject matter is that during arrester releases energy, source is in earth-return circuit all the time with net, is added lightning-arrest
Device rated voltage and power consumption capacity, and then have impact on circuit breaker trip speed, at the same arrester rated voltage and power consumption capacity with
The increase of direct current net voltage class and increase, cost can also be dramatically increased therewith.
The content of the invention
To solve the above problems, the invention provides a kind of topology knot of the quick mixed type dc circuit breaker of both arms framework
Structure, is remaining the good static characteristic of mechanical switch and the good dynamic characteristic of solid-state switch is reduced directly simultaneously, significantly
The voltagerating grade and power consumption capacity of arrester are flowed, comprising by Quick mechanical disconnecting switch, two-way load transfer switch, unidirectional
Solid-state switch group of the series connection with anti-paralleled diode, current-limiting reactor, fly-wheel diode group and non-linear bleeder resistance composition,
The electric current under normal loop condition can be closed, carried and cut-off, and can close, carry and cut-off exception within the defined time
Electric current under loop condition (including short circuit condition).
To achieve the above object, the technical scheme taken of the present invention is：
A kind of topological structure of the quick mixed type dc circuit breaker of both arms framework, in Bridge 1 arm, main circuit breaker A1Branch
Unidirectional solid-state switch group of the series connection with anti-paralleled diode of route is constituted, and primary current leg (i.e. load transfer branch road) is by quick
Mechanical switch A3With two-way load transfer solid-state A2Switch is in series, and energy afterflow absorption circuit is by a non-linear vent discharge
Hinder A5With fly-wheel diode group A4Series connection, and in A4One in parallel of two ends are by diode A6With Fast mechanical switch A7Composition series connection branch
Road；In Bridge 2 arm, main circuit breaker B1Unidirectional solid-state switch group of the series connection with anti-paralleled diode of branch route is constituted, main electricity
Branch road (i.e. load transfer branch road) is flowed by Fast mechanical switch B3With two-way load transfer solid-state switch B2In series, energy continues
Absorption circuit is flowed by a non-linear bleeder resistance B5With fly-wheel diode group B4Series connection, and in B4One in parallel of two ends are by two poles
Pipe B6With Fast mechanical switch B7Constitute series arm；Double arm paths pass through the connected N of current-limiting reactor L in back-to-back form1
And N2, 1 end and 2 ends connect direct current net positive pole and negative pole respectively, and 3 ends and 4 ends connect opposite side direct current net positive pole and negative pole respectively；
In main circuit breaker branch road A1、B1In, the equal parallel connection buffer electric capacity C of each solid-state switch pipeQWith resistance RQ；In fly-wheel diode group
A4、B4In the equal parallel resistance R of each fly-wheel diodeD, wherein RQ＜ ＜ RD。
Preferably, in the case of normally on doube bridge arm primary current leg series connection collectively as principal current circulation branch
Road, simultaneously turns off two-way load transfer switch A on doube bridge arm during failure2And B2, fault current is transferred to be connected in parallel unidirectional
Solid-state switch group A of the series connection with anti-paralleled diode1And B1Branch road；When primary current leg electric current is reduced to zero, machine is turned off rapidly
Tool disconnecting switch A3And B3, mechanical isolation switch contact non-arc breaking from.
Preferably, when mechanical switch open to it is specified open away from when, so as to protect two-way load transfer switch A2And B2, it is it
Primary voltage isolation is set up in integrated circuit；Unidirectional solid-state switch group of the series connection with anti-paralleled diode of rapid shut-off simultaneously
A1And B1, subsequent mechanical switch A7And B7Closure, non-linear bleeder resistance A is transferred to by fault current5、B5Loop.
Preferably, when electric current is from left port port transmission to the right, dump energy main circuit breaker B from Bridge 2 arm1Branch road
The reverse parallel connection fly-wheel diode of solid-state switch group circulates, finally the nonlinear resistance A in Bridge 1 arm5Release；Conversely, remaining
The reverse parallel connection fly-wheel diode circulation of energy main circuit breaker branch road solid-state switch group from Bridge 1 arm, finally, by Bridge 2 arm
Middle nonlinear resistance B5Release, reach solution overvoltage and absorb energy purpose, so as to realize that DC current is turned off.
Preferably, when breaker needs to recover normal work, controlling switch A is passed through7And B7Cut-off to detect A4And B4Two
Terminal voltage judges whether DC side failure is eliminated, due to main circuit breaker branch road solid-state switch equivalent resistance R in parallelQIt is much smaller than
Fly-wheel diode equivalent resistance R in parallelD, therefore most DC voltages, Ke Yishi are born in fly-wheel diode group two ends
The no-voltage of existing main circuit breaker branch road solid-state switch group opens (Zero Voltage Switching, ZVS), if short trouble
Do not eliminate, fly-wheel diode group both end voltage will not rise so that N1And N2In ground potential：When DC side failure is clear
When needing to recover normal work except rear breaker, unidirectional solid-state of the series connection with anti-paralleled diode on main circuit breaker is opened successively
Switches set A1And B1, Quick mechanical disconnecting switch A3And B3, two-way load transfer switch A2And B2。
Preferably, described main circuit breaker A1And B1Take unidirectional solid-state switch of the series connection with inverse parallel fly-wheel diode
Group, by turning off A1And B1Fault current is transferred to by non-linear bleeder resistance A5、B5With fly-wheel diode group A4、B4Composition
Energy bleed-off circuit so that source improves the circuit breaker trip speed not in earth fauit loops.
Preferably, the nonlinear resistance A in dump energy afterflow (energy is released) link, bridge arm5And B5Voltagerating it is remote
Less than overall direct current network grade of rated voltage, while the capacity that consumes energy only cuts off failure electricity by current-limiting reactor L in main circuit breaker
Energy is stored after stream and determines that dump energy is absorbed and overvoltage protection is mainly completed by non-linear bleeder resistance.
The invention has the advantages that：
1st, the quick mixed type topological structure of both arms framework, main circuit breaker A are proposed1And B1Unidirectional series connection is taken to carry instead simultaneously
The solid-state switch group of di- pole pipe, passes through unidirectional solid-state switch group A of the series connection with anti-paralleled diode of shut-off1And B1, by failure
Electric current is transferred to by non-linear bleeder resistance A5(B5) and fly-wheel diode group Ax (B4) composition bleed-off circuit so that source does not exist
In earth fauit loops, and then improve circuit breaker trip speed；
2nd, nonlinear resistance A in bridge arm5And B5Voltagerating be much smaller than overall direct current network grade of rated voltage, simultaneously
Only by current-limiting reactor L, storage energy is determined power consumption capacity after main circuit breaker cuts off fault current；
3rd, the type mixed type dc circuit breaker take full advantage of mechanical switch low-loss current capacity and insulating capacity,
The connecting-disconnecting function of solid-state switch, realizes the fast transfer of DC current, quick-speed turning on-off, the mixed type high pressure proposed compared to ABB
Direct-current breaker topology structure, although add a set of fly-wheel diode group A4(B4), but can make after main circuit breaker shut-off
Source not in earth fauit loops, and then improve circuit breaker trip speed, taken shelter from the thunder while significantly reducing direct current
The voltagerating grade and power consumption capacity of device, significantly reduce manufacturing cost.The present invention can meet China's direct current transportation net and straight
Flow requirement of the power distribution network to dc circuit breaker.
Brief description of the drawings
Fig. 1 is a kind of Basic Topological signal for the quick mixed type dc circuit breaker of both arms framework that the present invention is provided
Figure；
In figure：(a) it is the quick mixed type dc circuit breaker basic topology of both arms framework；(b) it is single to carry inverse parallel two
The IGBT concrete structures of pole pipe；(c) fly-wheel diode of equalizing resistance is carried；
Fig. 2 is a kind of topological structure schematic diagram for the quick mixed type dc circuit breaker of both arms framework that the present invention is provided；
Fig. 3 is a kind of quick mixed type dc circuit breaker control strategy flow signal for both arms framework that the present invention is provided
Figure；
In figure：(a) control strategy during separating brake；(b) control strategy when closing a floodgate；
When Fig. 4 normally runs for breaker in Fig. 2, the mixed type dc circuit breaker working condition topological structure schematic diagram；
Fig. 5 be Fig. 2 in break down moment when, mixed type dc circuit breaker working condition (off state) schematic diagram；
Fig. 6 is two-way load transfer switch A in Fig. 22And B2During disconnection, the mixed type dc circuit breaker working condition (shut-off
State) schematic diagram；
Fig. 7 is main circuit breaker A in Fig. 21And B1During disconnection, fault current shows working condition (shut-off shape for buffering electric capacity charging
State) schematic diagram；
Fig. 8 is main circuit breaker A in Fig. 21And B1During disconnection, fault current is transferred to nonlinear resistance A4(B4) branch road when work
Make state (off state) schematic diagram；
Fig. 9 is main circuit breaker A in Fig. 21And B1When opening, the mixed type dc circuit breaker working condition (starting state) is shown
It is intended to；
Figure 10 is load transfer branch road mechanical switch A in Fig. 23And B3During closure, the mixed type dc circuit breaker working condition
(starting state) schematic diagram；
Figure 11 be the present invention provide in the two-terminal direct current transmission system of monopole, the mixed type dc circuit breaker structure is shown
It is intended to；
In figure：(a) the practical application topological structure schematic diagram of the quick mixed type dc circuit breaker of both arms framework, (b) is single
The quick mixed type direct-current breaker topology (be only applicable to energy turned right from left port the situation of port transmission) of arm support structure, (c)
The quick mixed type direct-current breaker topology (be only applicable to energy turned left from right output port the situation of port transmission) of single armed framework；
Figure 12 be the present invention provide in the two-terminal direct current transmission system of monopole, the mixed type dc circuit breaker other one
Plant topological structure schematic diagram；
In figure：(a) another topological structure schematic diagram of the quick mixed type dc circuit breaker of both arms framework；(b) it is single
The quick mixed type direct-current breaker topology (be only applicable to energy turned right from left port the situation of port transmission) of arm support structure；(c)
The quick mixed type dc circuit breaker (be only applicable to energy turned left from right output port the situation of port transmission) of single armed framework；
Figure 13 be the present invention provide in bipolar two-terminal direct current transmission system, the mixed type dc circuit breaker structure is shown
It is intended to；
Figure 14 is the quick mixed type dc circuit breaker separating brake process simulation waveform of both arms framework that the present invention is provided；In figure：
(a) separating brake process current simulations waveform；(b) separating brake process voltage simulation waveform；
Figure 15 is the quick mixed type dc circuit breaker making process simulation waveform of both arms framework that the present invention is provided；In figure：
(a) making process current simulations waveform；(b) making process voltage simulation waveform.
Embodiment
In order that objects and advantages of the present invention are more clearly understood, the present invention is carried out with reference to embodiments further
Describe in detail.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not used to limit this hair
It is bright.
As shown in figure 1, the embodiments of the invention provide a kind of topology of the quick mixed type dc circuit breaker of both arms framework
Structure, in Bridge 1 arm, main circuit breaker A1Unidirectional solid-state switch group of the series connection with anti-paralleled diode of branch route is constituted, main
Current branch (i.e. load transfer branch road) is by Fast mechanical switch A3With two-way load transfer solid-state A2Switch in series, energy
Afterflow absorption circuit is by a non-linear bleeder resistance A5With fly-wheel diode group A4Series connection, and in A4One in parallel of two ends are by two
Pole pipe A6With Fast mechanical switch A7Constitute series arm；In Bridge 2 arm, main circuit breaker B1The unidirectional series connection of branch route is with anti-
The solid-state switch group of parallel diode is constituted, and primary current leg (i.e. load transfer branch road) is by Fast mechanical switch B3Born with two-way
Solid-state switch B is changed in idling2In series, energy afterflow absorption circuit is by a non-linear bleeder resistance B5With fly-wheel diode group
B4Series connection, and in B4One in parallel of two ends are by diode B6With Fast mechanical switch B7Constitute series arm；Double arm paths are to carry on the back
The situation of backrest passes through the connected N of current-limiting reactor L1And N2, 1 end and 2 ends connect direct current net positive pole and negative pole, 3 ends and 4 ends respectively
Opposite side direct current net positive pole and negative pole are connected respectively；(4) in main circuit breaker branch road A1(B1) in, each solid-state switch pipe is simultaneously
Connection buffering electric capacity CQWith resistance RQ；In fly-wheel diode group A4、B4In the equal parallel resistance R of each fly-wheel diodeD, wherein RQ＜
＜ RD。
Mechanical switch A during due to long-term current flowing3And B3Small, solid-state switch group A is lost1And B1Loss is big, therefore, I
Used a mechanical switch A3(B3) series load change-over switch A2(B2) structure, normal current circulate when, the type break
The two-way load-transfer switch A of road device2(B2) although certain on-state loss is added, from the aspect of reliability, due to turning
Journey is moved past by two-way load-transfer switch A2(B2) realize, the fast reliability of transfer velocity is high so that the reality of the type dc circuit breaker
Significantly improved with property.In Fig. 1 current-limiting reactor L can effective fault current limiting climbing, so as to also just reduce pair
Mechanical switch A3(B3) quick-action requirement.During breaker open operation, load-transfer switch A two-way first2(B2) shut-off,
Fault current is forced to be transformed into main circuit breaker A1(B1) branch road, now, two-way load-transfer switch A2(B2) voltage that bears
Only main circuit breaker solid-state switch group A1(B1) tube voltage drop, when primary current leg electric current is reduced to zero, Fast mechanical switch move
Make, now, two-way load-transfer switch A2(B2) voltage that bears is quickly transferred on Fast mechanical switch；When Quick mechanical is opened
Pass reach it is certain open away from when, Fast mechanical switch A3(B3) both end voltage be main circuit breaker solid-state switch group A1(B1) tube voltage drop,
Now main circuit breaker solid-state switch group A1(B1) triggering shut-off, fault current is by solid-state switch group A1(B1) cut off, main circuit breaker is solid
State switch ends voltage rises rapidly, therefore fault current starts as buffering electric capacity CQCharging, when in buffering electric capacity both end voltage
When rising to DC voltage, fly-wheel diode group A4And B4Opening (then switchs A7And B7Closure), what is stored in reactor L is surplus
Remaining energy is final by non-linear bleeder resistance A5(B5) release.When breaker needs to recover normal work, pass through controlling switch
A7And B7Cut-off to detect A4(B4) both end voltage judges whether DC side failure is eliminated, because main circuit breaker branch road solid-state is opened
Close equivalent resistance ∑ (R in parallelQ) much smaller than the equivalent resistance ∑ (R of fly-wheel diode parallel connectionD), therefore fly-wheel diode group two
Bear most DC voltages in end, it is possible to achieve the no-voltage of main circuit breaker branch road solid-state switch group opens (Zero
Voltage Switching, ZVS), if short trouble is not eliminated, fly-wheel diode group both end voltage will not rise, and make
Obtain N1And N2In ground potential；When DC side failure, which is eliminated rear breaker, needs to recover normal work, main open circuit is opened successively
Unidirectional solid-state switch group A of the series connection with anti-paralleled diode on device1And B1, Quick mechanical disconnecting switch A3And B3, two-way load
Change-over switch A2And B2。
In practical engineering application, in the two-terminal direct current transmission system of monopole, as shown in figure 11, when both arms framework is quick
Mixed type dc circuit breaker side is broken down or when actively cutting off circuit, is required to simultaneously turn off two-way load transfer switch
A2And B2, now electric current be transferred on main circuit breaker branch road, doube bridge arm that the series connection of main circuit breaker branch road is common to be made by mechanical switch branch road
For the circulation branch road of electric current.When unidirectional solid-state switch group of the series connection with anti-paralleled diode triggers shut-off on main circuit breaker branch road
(subsequent mechanical switch A afterwards7And B7Closure)；Dump energy can be along the anti-of the unidirectional inline solid state switches set two ends parallel connection of main circuit breaker
Circulate to diode (when electric current is from left port port transmission to the right, dump energy main circuit breaker B from Bridge 2 arm1Branch road is consolidated
The reverse parallel connection fly-wheel diode of state switches set circulates, finally the nonlinear resistance A in Bridge 1 arm5Release；Conversely, residual energy
The reverse parallel connection fly-wheel diode circulation of the main circuit breaker branch road solid-state switch group from Bridge 1 arm is measured, finally, in Bridge 2 arm
Nonlinear resistance B5Release).
In bipolar two-terminal direct current transmission system, as shown in figure 13, extreme break down when a certain or actively cut off line
Lu Shi, is required to simultaneously turn off two-way load transfer switch A2And B2(C2And D2), now electric current is transferred to by mechanical switch branch road
Main circuit breaker A on main circuit breaker branch road, doube bridge arm1And B1(C1And D1) branch road series connection collectively as electric current circulation branch road.Work as master
(subsequent mechanical switch A after solid-state switch group triggering shut-off of the unidirectional series connection with anti-paralleled diode on breaker branch road7And B7
(C7And D7) closure)；Dump energy can circulate along the unidirectional inline solid state switches set two ends of main circuit breaker backward dioded in parallel
(when energy turns right port transmission from left port, backward dioded stream of the dump energy from the parallel connection of Bridge 2 arm solid-state switch group
It is logical；When energy turns left port transmission from right output port, backward dioded stream of the dump energy from the parallel connection of Bridge 1 arm solid-state switch group
It is logical)；Final dump energy is by nonlinear resistance A5Or B5(C5Or D5) release.
Below described mixing is specifically described when this energy one way flow exemplified by mixed type dc circuit breaker action
The breaking course and making process of type dc circuit breaker, as shown in Figure 2：
1st, the mixed type dc circuit breaker separating brake process：
(1) mechanical switch A is normally run in system3And B3Closure state is in, two-way load transfer switchs A2And B2
In opening state, main circuit breaker branch road solid-state switch A1And B1Opening state is in, in order to prevent electric current from leading directly to, machinery is opened
Close A7And B7It is in off-state；
(2) during normal operation DC current from mechanical switch A3And B3Branch road passes through, i.e. mechanical switch A3And B3In closure
State, load transfer switch A2And B2In opening state, current flow paths are as shown in Figure 4；
(3) when detecting fault current, fault current rises rapidly, and current flow paths are as shown in figure 5, when failure electricity
Stream switchs A up to two-way load transfer2And B2Shut-off threshold values when, two-way load transfer switch A is triggered immediately2And B2Shut-off, failure
Electric current is compulsory to be transferred to main circuit breaker A1And B1Branch road, when primary current leg is reduced to zero, Fast mechanical switch A3And B3
Action, Fast mechanical switch A3And B3It can be opened under zero current, current flow paths are as shown in Figure 6；
(4) as mechanical switch A3And B3Open to necessarily opening away from rear, i.e. mechanical switch A3And B3Dielectric strength can bear to close
During overvoltage when disconnected, primary voltage isolation, the solid-state switch group A of main circuit breaker branch road are formed1And B1Receive shut-off instruction to cut
Disconnected short-circuit current；
(5) main circuit breaker solid-state switch group A1(B1) after shut-off, fault current starts as buffering electric capacity CQCharging, it is main disconnected
Road device solid-state switch both end voltage rises rapidly, as shown in Figure 7；
(6) when buffering electric capacity both end voltage increases to DC voltage, A is switched7And B7Closure, while fly-wheel diode
Remaining perceptual energy is then by afterflow bleed-off circuit through non-linear bleeder resistance A on group conducting, circuit5(B5) release, electric current by
The decrescence as little as level of leakage current, disjunction terminates, and current flow paths are as shown in Figure 8.
It is the breaking course of breaker above, breaking course is flowed through shown in electric current such as Figure 14 (a) of each branch road of breaker, I0
For the electric current of load transfer branch road, I1To flow through the electric current of main circuit breaker branch road, I2To flow through the electricity at fly-wheel diode group two ends
Stream；t0Moment breaks down, and fault current rises rapidly, when fault current rises to IP1When, i.e. t1The two-way load of time trigger turns
Switch OFF is changed, electric current is transferred to main circuit breaker branch road from load transfer branch road, when fault current rises to IP2When, i.e. t2Moment touches
Unidirectional solid-state switch group of the series connection with anti-paralleled diode on hair shut-off main circuit breaker branch road, fault current is from main circuit breaker branch
Road is transferred in energy afterflow absorption circuit, t2~t3Released absorption process for energy.Master is broken when Figure 14 (b) is breaker disjunction
Road device branch voltage (U1) and fly-wheel diode group two ends voltage (U2) change procedure.
2nd, the mixed type dc circuit breaker making process：
(1) it is first turned on switching A before closing a floodgate7And B7If, fly-wheel diode group A4And B4Both end voltage, which rises, (switchs A7
And B7Both end voltage rises), it was demonstrated that failure has been eliminated；Otherwise, failure is not eliminated, making process pause；
(2) due to main circuit breaker branch road solid-state switch equivalent resistance ∑ (R in parallelQ) in parallel much smaller than fly-wheel diode
Equivalent resistance ∑ (RD), therefore open switch A7And B7Afterwards, fly-wheel diode group A4(B4) two ends bear most DC sides electricity
Pressure, main circuit breaker branch road bears very little voltage；Unidirectional series connection on main circuit breaker can be then opened under small voltage to carry instead simultaneously
The solid-state switch group A of di- pole pipe1And B1, current flow paths are as shown in Figure 9；
(3) necessarily retarded closing Fast mechanical switch A is prolonged3And B3, now two-way load transfer switch A2(B2) it is subjected only to master
Breaker A1(B1) unidirectional conduction voltage drop of the series connection with anti-paralleled diode solid-state switch group on branch road；
(4) after certain delay, two-way load transfer switch A is opened2And B2, current flow paths as shown in Figure 10, electric current from
Main circuit breaker A1And B1Branch road is transferred to two-way load transfer switch A2And B2Branch road, now two-way load transfer switch A2And B2Two
Terminal voltage is the conduction voltage drop of itself, and combined floodgate terminates.
Above is breaker closing process, main circuit breaker branch voltage (U when Figure 15 (b) is closes a floodgate1) and fly-wheel diode
Voltage (the U at group two ends2) change procedure, in t4At the moment, open switch A7And B7, because main circuit breaker branch road solid-state switch is in parallel
Equivalent resistance ∑ (RQ) much smaller than the equivalent resistance ∑ (R of fly-wheel diode group parallel connectionD), therefore fly-wheel diode group A4(B4)
Two ends (switch A7(B7) two ends) bear most DC voltages, t5Moment opens main circuit breaker branch road solid-state switch group,
It can realize that the no-voltage of main circuit breaker branch road solid-state switch group opens (Zero Voltage Switching, ZVS), t5~t6
Closure Fast mechanical switch A in time3And B3, t6Moment opens two-phase load transfer switch A2And B2, starting current is by main open circuit
Device branch road is transferred to load transfer branch road.Figure 15 (a) is correspondence moment each branch current change procedure, I0To flow through load transfer
The electric current of branch road, I1To flow through the electric current of main circuit breaker branch road, I2To flow through fly-wheel diode group A4(B4) electric current (I2Closing a floodgate
During be always zero).
The mixed type dc circuit breaker control strategy：(1) control strategy during separating brake：Control strategy flow such as Fig. 3 (a) institutes
Show.A is switched when straight-flow system current instantaneous value exceedes two-way load transfer2And B2Threshold values or when actively cutting off circuit, it is two-way negative
Carry change-over switch A2And B2Cut-off current is transferred to main circuit breaker A1And B1Branch road, Fast mechanical switch A is flowed through when detecting3And B3
Electric current when being zero, Fast mechanical switch A3And B3It is rapid to open, as Fast mechanical switch A3And B3Reach it is certain open away from when, touch
Send out main circuit breaker A1And B1Branch road solid-state switch group is turned off, when main circuit breaker branch current is zero, rapid closing mechanical switch A7
And B7；(2) control strategy when closing a floodgate：Shown in control strategy flow such as Fig. 3 (b).Open switch A7And B7If, fly-wheel diode group
A4(B4) both end voltage rises (switch A rapidly7(B7) both end voltage rises rapidly), main circuit breaker A is then opened successively1And B1
Branch road solid-state switch group, Fast mechanical switch A3And B3, two-way load transfer switch A2And B2.If fly-wheel diode group A4(B4) two
Terminal voltage does not rise, and breaker closing process is suspended.
The quick mixed type dc circuit breaker of described both arms framework, can close, carries and cut-off under normal loop condition
Electric current, and can close, carried within the defined time and cut-off the electric current under abnormal loop condition (including short circuit condition), carry
High practical engineering application.By the quantity, the fly-wheel diode serial number that change main circuit breaker branch road series power electronic switch
Amount changes the voltage class of breaker cutout with the selection of nonlinear resistance.
Described above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, under the premise without departing from the principles of the invention, some improvements and modifications can also be made, these improvements and modifications also should
It is considered as protection scope of the present invention.
Claims (7)
1. the topological structure of the quick mixed type dc circuit breaker of a kind of both arms framework, it is characterised in that in Bridge 1 arm, main
Breaker A1Unidirectional solid-state switch group of the series connection with anti-paralleled diode of branch route is constituted, and primary current leg is opened by Quick mechanical
Close A3With two-way load transfer solid-state A2Switch is in series, and energy afterflow absorption circuit is by a non-linear bleeder resistance A5With
Fly-wheel diode group A4Series connection, and in A4One in parallel of two ends are by diode A6With Fast mechanical switch A7Constitute series arm；
In Bridge 2 arm, main circuit breaker B1Unidirectional solid-state switch group of the series connection with anti-paralleled diode of branch route is constituted, primary current leg
By Fast mechanical switch B3With two-way load transfer solid-state switch B2In series, energy afterflow absorption circuit is non-linear by one
Bleeder resistance B5With fly-wheel diode group B4Series connection, and in B4One in parallel of two ends are by diode B6With Fast mechanical switch B7Composition
Series arm；Double arm paths pass through the connected N of current-limiting reactor L in back-to-back form1And N2, 1 end and 2 ends are connected directly respectively
Drift net positive pole and negative pole, 3 ends and 4 ends connect opposite side direct current net positive pole and negative pole respectively；In main circuit breaker branch road A1、B1In, often
The equal parallel connection buffer electric capacity C of one solid-state switch pipeQWith resistance RQ；In fly-wheel diode group A4、B4In each fly-wheel diode it is equal
Parallel resistance RD, wherein RQ＜ ＜ RD。
2. a kind of quick mixed type direct-current breaker topology structure of both arms framework according to claim 1, its feature exists
In, in the case of normally on doube bridge arm primary current leg series connection collectively as principal current circulation branch road, during failure simultaneously
Turn off two-way load transfer switch A on doube bridge arm2And B2, fault current is transferred to the unidirectional series connection being connected in parallel and carried instead simultaneously
The solid-state switch group A of di- pole pipe1And B1Branch road；When primary current leg electric current is reduced to zero, rapid shut-off mechanical isolation switch A3
And B3, mechanical isolation switch contact non-arc breaking from.
3. a kind of quick mixed type direct-current breaker topology structure of both arms framework according to claim 1, its feature exists
In, when mechanical switch open to it is specified open away from when, so as to protect two-way load transfer switch A2And B2, it is it in integrated circuit
Set up primary voltage isolation；Unidirectional solid-state switch group A of the series connection with anti-paralleled diode of rapid shut-off simultaneously1And B1, subsequent machine
Tool switchs A7And B7Closure, non-linear bleeder resistance A is transferred to by fault current5(B5) loop.
4. a kind of quick mixed type direct-current breaker topology structure of both arms framework according to claim 1, its feature exists
In, when electric current is from left port port transmission to the right, dump energy main circuit breaker B from Bridge 2 arm1Branch road solid-state switch group
Reverse parallel connection fly-wheel diode circulates, finally the nonlinear resistance A in Bridge 1 arm5Release；Conversely, dump energy is from Bridge 1 arm
The reverse parallel connection fly-wheel diode circulation of middle main circuit breaker branch road solid-state switch group, finally, the nonlinear resistance B in Bridge 2 arm5
Release, reach solution overvoltage and absorb energy purpose, so as to realize that DC current is turned off.
5. a kind of quick mixed type direct-current breaker topology structure of both arms framework according to claim 1, its feature exists
In, when breaker need recover normal work when, pass through controlling switch A7And B7Cut-off to detect A5And B5Both end voltage judges straight
Whether stream side failure is eliminated, due to main circuit breaker branch road solid-state switch equivalent resistance R in parallelQMuch smaller than fly-wheel diode simultaneously
The equivalent resistance R of connectionD, therefore most DC voltages are born at fly-wheel diode group two ends, it is possible to achieve main circuit breaker branch
The no-voltage of road solid-state switch group is open-minded, if short trouble is not eliminated, and fly-wheel diode group both end voltage will not rise,
So that N1And N2In ground potential；When DC side failure, which is eliminated rear breaker, needs to recover normal work, open successively main disconnected
Unidirectional solid-state switch group A of the series connection with anti-paralleled diode on the device of road1And B1, Quick mechanical disconnecting switch A3And B3, it is two-way negative
Carry change-over switch A2And B2。
6. a kind of quick mixed type direct-current breaker topology structure of both arms framework according to claim 1, its feature exists
In described main circuit breaker A1And B1Unidirectional solid-state switch group of the series connection with inverse parallel fly-wheel diode is taken, by turning off A1
And B1Fault current is transferred to by non-linear bleeder resistance A5(B5) and fly-wheel diode group A4(B4) composition energy release back
Road.
7. a kind of quick mixed type direct-current breaker topology structure of both arms framework according to claim 1, its feature exists
In the nonlinear resistance A in dump energy afterflow link, bridge arm5And B5Voltagerating be much smaller than the overall specified electricity of direct current network
Grade is pressed, while only by current-limiting reactor L, storage energy is determined the capacity that consumes energy after main circuit breaker cuts off fault current, residual energy
Amount is absorbed and overvoltage protection is mainly completed by non-linear bleeder resistance.
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| CN113852051A (en) * | 2021-09-13 | 2021-12-28 | 中国科学院电工研究所 | Direct-current solid-state circuit breaker with bidirectional breaking and soft starting functions and control method |
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| CN108597926A (en) * | 2018-01-12 | 2018-09-28 | 山东大学 | A kind of hybrid direct-current breaker topology structure and its control method |
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| CN108879620B (en) * | 2018-07-25 | 2024-04-19 | 西安交通大学 | Direct current breaker based on mechanical switch arc voltage transfer and use method thereof |
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| CN112152599A (en) * | 2020-08-13 | 2020-12-29 | 中车株洲电力机车研究所有限公司 | All-solid-state direct current circuit breaker |
| CN113162000A (en) * | 2021-01-08 | 2021-07-23 | 天津大学 | Improved self-adaptive current-limiting direct current solid-state circuit breaker and control method thereof |
| CN113162000B (en) * | 2021-01-08 | 2023-02-21 | 天津大学 | Improved self-adaptive current-limiting direct current solid-state circuit breaker and control method thereof |
| CN113852051A (en) * | 2021-09-13 | 2021-12-28 | 中国科学院电工研究所 | Direct-current solid-state circuit breaker with bidirectional breaking and soft starting functions and control method |
| CN114400643A (en) * | 2021-12-25 | 2022-04-26 | 智寰(北京)氢能科技有限公司 | Stable flexible direct-current power grid topological structure |
| CN114400643B (en) * | 2021-12-25 | 2024-02-23 | 智寰(北京)氢能科技有限公司 | Stable flexible direct-current power grid topological structure |
| CN116192106A (en) * | 2023-03-14 | 2023-05-30 | 珠海汇众能源科技有限公司 | Direct current breaker circuit |
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