CN106099878B - A kind of capacitor charging type bidirectional, dc breaker and its application - Google Patents

A kind of capacitor charging type bidirectional, dc breaker and its application Download PDF

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Publication number
CN106099878B
CN106099878B CN201610630952.0A CN201610630952A CN106099878B CN 106099878 B CN106099878 B CN 106099878B CN 201610630952 A CN201610630952 A CN 201610630952A CN 106099878 B CN106099878 B CN 106099878B
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CN
China
Prior art keywords
branch
capacitor
mechanical switch
current
series
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CN201610630952.0A
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Chinese (zh)
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CN106099878A (en
Inventor
周猛
林卫星
文劲宇
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华中科技大学
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Publication of CN106099878A publication Critical patent/CN106099878A/en
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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02HEMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00Emergency 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
    • H02H7/26Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
    • H02H7/268Sectionalised 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
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02HEMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H9/00Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
    • H02H9/005Emergency protective circuit arrangements for limiting excess current or voltage without disconnection avoiding undesired transient conditions
    • H02H9/007Emergency protective circuit arrangements for limiting excess current or voltage without disconnection avoiding undesired transient conditions avoiding or damping oscillations, e.g. fenoresonance or travelling waves

Abstract

The invention discloses a kind of capacitor charging type bidirectional, dc breakers, including auxiliary branch and main branch in parallel, wherein auxiliary branch is connected in series by the first mechanical switch and power electronic devices valve group, and main branch is composed of single-phase uncontrollable rectifier bridge and capacitor-mechanical switch capacitive series branch.The invention also discloses a kind of dc circuit breakers, main branch is coupled by the identical capacitive series branch reverse parallel connection of two structures, one of capacitive series branch is connected in series by mechanical switch, DC capacitor and diode valve group, another capacitive series branch structure is identical as first capacitor series arm element, and the mode of connection is opposite.The invention also discloses the control methods that Fault Isolation and high-speed reclosure are carried out to above-mentioned dc circuit breaker.The present invention can avoid the DC capacitor of current dc circuit breaker and the defect of line inductance inductor-capacitor easy to form oscillation, and its to cut-off direct fault current reliable and stable, it can be achieved that high-speed reclosure.

Description

A kind of capacitor charging type bidirectional, dc breaker and its application
Technical field
The invention belongs to electric system transmission & distribution electro-technical fields, more particularly, to a kind of capacitor charging type bidirectional, dc Breaker and its application in progress DC Line Fault isolation.
Background technique
With the development of modularization multi-level converter, constituting DC grid using modularization multi-level converter is electric power The hot spot that industry is concerned in recent years.DC grid needs interconnect DC power transmission line in DC side, send out When raw DC Line Fault, need to quickly isolate faulty line to avoid DC grid collapse of voltage, for this purpose, dc circuit breaker is large-scale The indispensable device of DC grid.
Solid-state switch dc circuit breaker is a kind of typical dc circuit breaker, by large number of full-control type power electronic Devices in series forms, and this dc circuit breaker its speed for cut-offfing direct fault current quickly, can be fastly to hundreds of delicate, still Major defect existing for the program is due to needing large number of all-controlling power electronics device, at high cost, conducting damage Consumption is high, and multiple all-controlling power electronics device series/parallels bring and press/ flow difficult defect.
To overcome the high defect of loss existing for solid-state switch dc circuit breaker, a kind of mixed type high pressure exists in the prior art Dc circuit breaker is mainly formed by auxiliary branch and solid-state switch branch circuit parallel connection, and wherein auxiliary branch is by full-control type electric power electricity Sub- device and Fast mechanical switch are connected in series, and solid-state switch branch and solid-state switch dc circuit breaker are almost the same, by counting Numerous all-controlling power electronics devices is measured to be connected in series.When normal work, auxiliary branch and solid-state switch branch are in simultaneously On state, since the conducting resistance of solid-state switch branch is much higher than auxiliary branch, DC current mainly passes through auxiliary branch stream Logical, the electric current of solid-state switch branch road is almost nil, so as to overcome solid-state switch straight for mixed type high voltage DC breaker High defect is lost in stream breaker.When cut-offfing direct fault current, the all-controlling power electronics device of auxiliary direct current will be first turned off To which DC current is transferred to solid-state switch branch, then by solid-state switch branch and its event of the arrester isolated DC of parallel connection Hinder electric current.This mixed type high voltage DC breaker has the advantages that loss is low, but due to still including solid-state switch branch, at This is more taller than solid-state switch dc circuit breaker, while its solid-state switch branch absorbs a large amount of energy during shutdown, makes Obtaining solid-state switch branch can not operate in the continuous shutdown of progress in the short time, so that mixed type high voltage DC breaker does not have quickly The ability of reclosing, the power supply speed after leading to fault recovery are slow.
A kind of mixed type high voltage DC breaker is disclosed in patent document WO2013/093066A, as shown in Figure 1, it is wrapped Main branch 24 and auxiliary branch 28 are included, wherein main branch 24 includes the mechanical switch 3 being serially connected and power electronic devices valve group 4, auxiliary branch 28 is in parallel with main branch 24 comprising capacitor 5.The type dc circuit breaker passes through when DC Line Fault that failure is electric Circulation moves on to the mode of capacitor 5, realizes isolated DC failure, can overcome conventional mixed type high voltage DC breaker master The defects of branch defect with high costs, still because current-limiting inductance 2 and capacitor 5 constitute series loop, on the one hand its It cut-offs during fault current there are inductor-capacitor resonance, needs that direct fault current could be turned off through the long period, while its is complete After primary shutdown, the voltage of capacitor 5 is charged to high pressure conditions, needs just to be able to achieve reclosing after discharging to capacitor 5, And the regular hour is needed to the electric discharge of capacitor 5, above scheme cannot achieve high-speed reclosure, and its power electronic devices thus Valve group 4 is all made of all-controlling power electronics device, 4 higher cost of power electronic devices valve group.
Patent document CN105656019A discloses a kind of capacitor charging type dc circuit breaker comprising auxiliary branch in parallel Road and main branch, wherein auxiliary branch is connected in series by the first mechanical switch and power electronic devices valve group, and main branch is by direct current Capacitor and diode valve group are connected in series, by DC current during DC Line Fault to the charge effects isolated DC of DC capacitor Fault current.When reclosing, detect that reclosing is just issued when dc circuit breaker line side DC voltage is higher than a certain threshold value to be referred to It enables.The present invention can avoid the DC capacitor of current dc circuit breaker and the defect of line inductance inductor-capacitor oscillation easy to form, And its to cut-off direct fault current reliable and stable, it can be achieved that high-speed reclosure.
It, can only isolated DC open circuit since direct fault current is only capable of uniaxially to DC charging but in the program Device line side DC failure, there are problems that can not isolated DC bus bar side DC Line Fault, also can not be to being connected in identical direct current Other DC lines of bus provide back-up protection.
Summary of the invention
Aiming at the above defects or improvement requirements of the prior art, it is disconnected that the present invention provides a kind of capacitor charging type bidirectional, dcs Road device, by improving the structure of mixed type high voltage DC breaker, so that can avoid current direct current interruption when isolated DC failure The defect of the capacitor and line inductance of device inductor-capacitor oscillation easy to form, and it can isolate DC bus side direct current Failure, cut-offs that direct fault current is reliable and stable, while can also mention to other DC lines for being connected in identical DC bus For back-up protection.
To achieve the above object, according to one aspect of the present invention, a kind of capacitor charging type bidirectional, dc open circuit is provided Device comprising auxiliary branch and main branch in parallel, wherein the auxiliary branch includes power electronic devices valve group, using as DC current when dc circuit breaker normally flows through branch;The main branch is by single-phase uncontrollable rectifier bridge and by direct current Hold the capacitor-mechanical switch branch combinations being composed in series with mechanical switch to form, wherein the input port of the uncontrollable rectifier bridge It is connected respectively with two ports of auxiliary branch, between the high and low pressure DC port of the uncontrollable rectifier bridge described in coupled in series Capacitor-mechanical switch series arm.
In the present solution, auxiliary branch has the function of bidirectionally isolated DC fault current, not controlling for the main branch is whole The input port of stream bridge is connected with two ports of auxiliary branch respectively, goes here and there between the high and low pressure DC port of uncontrollable rectifier bridge Connection connection DC capacitor, so that DC capacitor can be electrically charged when DC Line Fault occurs for line side or bus bar side;It is just normally closed When conjunction state, auxiliary branch is in closed state, and DC current circulates by auxiliary branch, when isolated DC fault current, electricity Power electronic device valve group will be turned off first to which DC current is transferred to main branch, and DC current will carry out DC capacitor Charging, when DC capacitor voltage is higher than non-faulting side DC voltage, DC current will begin to decline and finally be reduced to zero.The party Case is for being transferred to the branch road for fault current when needing to cut-off direct fault current.In the capacitor two sides, voltage is high It begins to decline DC current when dc circuit breaker bus bar side DC voltage and is finally reduced to zero.Single-phase uncontrollable rectifier bridge can Negative value is further changed to realize the two-way through-current capability of main branch, and after DC current being prevented to be reduced to zero to draw It plays capacitor and line inductance forms inductor-capacitor oscillation.
As present invention further optimization, the capacitor two sides of the main branch are also parallel with discharge paths, are used for To the capacitor discharge before dc circuit breaker reclosing.
As present invention further optimization, the discharge paths include the mechanical switch and resistance being serially connected.
As present invention further optimization, the discharge paths are parallel with one another multiple.
As present invention further optimization, the power electronic devices valve group of the auxiliary branch is by antiparallel full-control type Power electronic devices and antiparallel Thyristors in series form.
Parallel connection third is gone back as present invention further optimization, on the auxiliary branch and main branch of the dc circuit breaker Branch, the third branch route an arrester or are connected by multiple arresters and/or parallel combination forms.
As present invention further optimization, the parallel connection that the main branch and auxiliary branch of the dc circuit breaker are constituted is returned The outside on road has also been connected direct current current-limiting inductance, to limit the climbing speed of direct fault current.
As present invention further optimization, it is additionally parallel with capacitor in the line side of dc circuit breaker, reliably to sentence Whether disconnected DC Line Fault is removed, for reclosing.
As present invention further optimization, the auxiliary branch further includes the first mechanical switch, first mechanical switch It connects to form the auxiliary branch with power electronic devices valve group.
As present invention further optimization, the parallel connection of main branch and the auxiliary branch composition of the dc circuit breaker The second mechanical switch of the outside in circuit also coupled in series, for after breaking direct current DC power supply and dc circuit breaker it Between establish reliable clearance for insulation to preventing bus bar side DC voltage to be continuously applied on the arrester of third branch.
As present invention further optimization, the power electronic devices valve group of the auxiliary branch is by that can rapidly switch off All-controlling power electronics device (such as insulated gate bipolar transistor) and other power electronic devices such as thyristor of slower speed, Turn-off thyristor etc. is connected in series, and above scheme can substantially reduce the cost of auxiliary branch.
As present invention further optimization, also coupled in series has resistance on the capacitor of the additional parallel connection.
It is another aspect of this invention to provide that providing a kind of side for carrying out DC Line Fault isolation using the dc circuit breaker Method, wherein when this method is included in generation DC Line Fault, the power electronics valve group of auxiliary branch is turned off, thus by fault current It is transferred to main branch to charge to the DC capacitor, is higher than dc circuit breaker bus bar side DC voltage to the DC capacitor voltage When, fault current is off, and realizes DC Line Fault isolation.Or it when DC Line Fault occurs, is first turned off in the auxiliary branch Power electronic devices valve group, then open the first mechanical switch on the auxiliary branch.
As present invention further optimization, opens the first mechanical switch on the auxiliary branch and dropped to DC current After being zero, the second mechanical switch of external series connection is opened.
It is another aspect of this invention to provide that providing a kind of weight carried out after DC Line Fault isolation using above-mentioned dc circuit breaker Closing switch method, wherein this method be included in receive reclosing instruction after, first be closed auxiliary branch on the first mechanical switch, The power electronic devices valve group is opened again;Alternatively, being first closed auxiliary branch external series connection after receiving reclosing instruction The second mechanical switch connect, the first mechanical switch being then closed on auxiliary branch, finally opens the power electronic devices valve Group.
Another aspect according to the invention provides a kind of capacitor charging type bidirectional, dc breaker comprising in parallel is auxiliary Help branch and main branch, wherein the auxiliary branch includes power electronic devices valve group, using as dc circuit breaker normally When DC current flow through branch;
It is characterized in that, the main branch is coupled by the identical capacitive series branch reverse parallel connection of two structures, In a capacitive series branch be connected in series by mechanical switch, DC capacitor and diode valve group, another capacitive series branch Structure is identical as first capacitor series arm element, mode of connection phase
It is another aspect of this invention to provide that provide it is a kind of can high-speed reclosure capacity-charging bidirectional, dc breaker, After isolated DC failure, high-speed reclosure operation can be carried out without waiting for the electric discharge of charging capacitor, which is characterized in that should Dc circuit breaker is formed in parallel by auxiliary branch and main branch, wherein
The auxiliary branch is connected in series by the first mechanical switch and bi-directional electric power electronics valve group, when using as normally The branch that DC current flows through;
The main branch is composed of single-phase uncontrollable rectifier bridge and multiple capacitive series branch, wherein every group of capacitor string Connection branch routes the 4th mechanical switch and capacitor connects to be formed.The main branch after turning off auxiliary branch for fault current for mentioning For fault paths, so that fault current charges to the DC capacitor of main branch, when capacitance voltage is higher than dc circuit breaker non-faulting When the DC voltage of side, DC current begins to decline and is finally reduced to zero and realizes DC Line Fault and be isolated.Single-phase uncontrollable rectification The two-way through-current capability of main branch may be implemented in bridge, when so that DC Line Fault occurring for any side of dc circuit breaker, direct current interruption The DC Line Fault can be isolated in device, and can be prevented after DC current is reduced to zero the DC current be further changed to negative value from And prevent capacitor and line inductance from forming inductor-capacitor oscillation,
When normal work, the multiple groups capacitive series branch only one group of capacitive series branch the 4th mechanical switch be in close Conjunction state, the mechanical switch of remaining capacitive series branch are in the state of cut-offfing, and complete after cut-offfing direct fault current for the first time, Original the 4th mechanical switch in closed state will be opened, and original the 4th mechanical switch in state of cut-offfing will be by Closure, without waiting charging capacitor electric discharge to terminate that high-speed reclosure operation can be carried out.
As present invention further optimization, discharge loop is parallel on the capacitor in each capacitive series branch, it is right It is first disconnected and concatenated 4th mechanical switch of the capacitor before the capacitor discharge.
As present invention further optimization, the discharge loop in parallel with capacitor is by third mechanical switch and electric discharge Resistance is connected in series.
Parallel connection third is gone back as present invention further optimization, on the auxiliary branch and main branch of the dc circuit breaker Branch, the third branch route an arrester or are formed by multiple arrester serial or parallel connections.
As present invention further optimization, the parallel connection that the main branch and auxiliary branch of the dc circuit breaker are constituted is returned The outside on road has also been connected direct current current-limiting inductance, to limit the climbing speed of direct fault current.
As present invention further optimization, the parallel connection of main branch and the auxiliary branch composition of the dc circuit breaker The second mechanical switch of the outside in circuit also coupled in series, for after breaking direct current dc circuit breaker and direct current system it Between establish reliable clearance for insulation to preventing bus bar side DC voltage to be continuously applied on arrester.
As present invention further optimization, the power electronic devices valve group of the auxiliary branch is by quick full-control type electricity Power electronic device (such as insulated gate bipolar transistor) and other power electronic devices such as thyristor of slower speed can turn off brilliant lock Pipe etc. is connected in series, and each power electronic devices is all made of antiparallel mode and couples so that the auxiliary branch has The ability of standby isolation bidirectional current.
As present invention further optimization, it is additionally parallel with capacitor in the line side of dc circuit breaker, reliably to sentence Whether disconnected DC Line Fault is removed, for reclosing.
As present invention further optimization, also coupled in series has resistance on the capacitor of the additional parallel connection.
As another aspect of the present invention, a kind of capacitor charging type bidirectional, dc breaker is provided comprising in parallel is auxiliary Help branch and main branch, wherein
The auxiliary branch is connected in series by the first mechanical switch and bi-directional electric power electronic device valve group,
The main branch is formed by least two structure same capacitance series arm direction parallel connections, each capacitor series connection Branch is mainly connected in series by DC capacitor and diode valve group,
As the further preferred of above scheme, the both ends of the DC capacitor are also parallel with discharge paths;
As the further preferred of above scheme, the outside of the DC capacitor is also in series with the 4th mechanical switch.
Another aspect according to the invention, provide it is a kind of described in can high-speed reclosure dc circuit breaker carry out direct current The method of Fault Isolation, wherein when this method is included in generation DC Line Fault, is first turned off power electronic devices valve group, gives simultaneously Instruction is cut-off in mechanical switch sending on auxiliary branch, after DC current is reduced to zero in DC line, opens one of institute The mechanical switch for being in closed state in tandem compound is stated, realizes direct fault current isolation.
Another aspect according to the invention, provide it is a kind of described in can high-speed reclosure dc circuit breaker carry out direct current After Fault Isolation and high-speed reclosure method, wherein this method is included in receive reclosing instruction after, be closed an initial place In the 4th mechanical switch of the state of cut-offfing, it is then closed the first mechanical switch, then opens power electronic devices valve group, is realized fast Fast reclosing restores direct current supply.
As present invention further optimization, reclosing instruction is just issued after true DC Line Fault has been removed.
As present invention further optimization, direct current is judged by detecting the DC voltage value in dc circuit breaker line side Whether failure has been cleared by, and when the absolute value of dc circuit breaker line side DC voltage is higher than certain threshold value, then judgement is straight Stream failure has been cleared by.
In general, through the invention it is contemplated above technical scheme is compared with the prior art, can obtain down and show Beneficial effect:
(1) dc circuit breaker of the invention, main branch use single-phase uncontrollable rectifier bridge and mechanical switch-DC capacitor The scheme of tandem compound makes main branch have two-way through-current capability, so that the present invention has two-way isolated DC failure The ability of electric current, and single-phase uncontrollable rectifier bridge eliminates existing inductor-capacitor resonance problems during cut-offfing DC Line Fault;
(2) the power electronics valve group of dc circuit breaker of the invention, auxiliary branch uses all-controlling power electronics device Valve group and half control type power electronic devices valve group are connected in series to reduce the cost of entire power electronics valve group, substantially reduce The semiconductor cost of auxiliary branch;
(3) dc circuit breaker of the invention, the single electricity of parallel combination substitution of multiple " four mechanical switch-capacitors " Container is so that designed dc circuit breaker has high-speed reclosure ability, and recovery supplies after greatly improving DC system fault The speed of electricity.
(4) dc circuit breaker of the invention compare with conventional mechanical dc circuit breaker, during isolated DC failure not Electric arc can be generated to substantially increase the reliability that dc circuit breaker cut-offs direct fault current.
Detailed description of the invention
Fig. 1 is the mixed type high-voltage direct-current breaker topology that a kind of existing main branch is only made of Single Capacitance device;
Fig. 2 is the mixed type high-voltage direct-current breaker topology that existing another main branch is only made of Single Capacitance device;
Fig. 3 is the topology of the capacitor charging type bidirectional, dc breaker of one embodiment of the invention;
Fig. 4 be another embodiment of the present invention main branch by multiple capacitive series branch it is in parallel after again with it is single-phase uncontrollable The topology for the dc circuit breaker that rectifier bridge is composed.
Fig. 5 has been that the direct current of the additional capacitor in parallel in the line side in dc circuit breaker of another of the invention embodiment is disconnected Road device topology;
Fig. 6 is that the main branch of further embodiment of the present invention is anti-by two " DC capacitor-diode valve group " series arms To the reversible capacitance charge type direct-current breaker topology of parallel connection;
Fig. 7 is that the auxiliary branch of further embodiment of the present invention is free of the reversible capacitance charge type direct current of the first mechanical switch Breaker topology.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and It is not used in the restriction present invention.As long as in addition, technical characteristic involved in the various embodiments of the present invention described below Not constituting a conflict with each other can be combined with each other.
Fig. 3 show the electrical block diagram of the capacitor charging type bidirectional, dc breaker 1 of one embodiment of the invention. As shown in figure 3, dc circuit breaker 1 is mainly formed in parallel by auxiliary branch 2 and main branch 3, wherein auxiliary branch 2 is by the first machinery Switch 11 and power electronics valve group 13 are connected in series, and main branch is by capacitor 10, the 4th mechanical switch 9 and four diode valves Group 5a, 5b, 5c, 5d are composed.Four diode valve groups 5a, 5b, 5c, 5d constitute single-phase uncontrollable rectifier bridges, this is single-phase not to control The input terminal of rectifier bridge is connected with two ports of auxiliary branch 2 respectively, the high and low pressure DC side of single-phase uncontrollable rectifier bridge across Connect DC capacitor 10.
As shown in figure 3, condenser voltage rises too high in order to prevent, and in a preferred embodiment, auxiliary branch 2 and master The third branch that can be made of with parallel connection arrester 4 on branch 3.
As shown in figure 3, DC voltage is continuously applied and makes 4 due to leakage current of arrester on arrester 4 and mistake in order to prevent Heat, in a preferred embodiment, the outside for the shunt circuit that auxiliary branch 2, main branch 3 are constituted can also connect second machinery Switch 15.In another embodiment, the external string for the shunt circuit that auxiliary branch 2, main branch 3 and third branch 4 are constituted Join the second mechanical switch 15.
Second mechanical switch 15 for after dc circuit breaker cut-offs direct fault current block arrester leakage current with Extend the service life of arrester, and reliable clearance for insulation can be established between DC power supply and fault point in order to event Barrier removes the maintenance with faulty equipment.
As shown in figure 3, in order to provide discharge path, in a preferred embodiment, the two of capacitor 10 to capacitor 10 Parallel connection discharge paths 6 are gone back at end.The discharge paths 6 are connected in series by third mechanical switch 7 and discharge resistance 8, pass through closure the Three mechanical switch 7 may make capacitor 10 to discharge by discharge paths 6.
As shown in figure 3, for the climbing speed of direct fault current during reducing DC Line Fault, in a preferred embodiment In, the outside for the shunt circuit that auxiliary branch 2, main branch 3 are constituted can also series direct current current-limiting inductance 16.It is preferred at another In embodiment, the external series direct current current-limiting inductance for the shunt circuit that auxiliary branch 2, main branch 3 and third branch 4 are constituted 16。
When normally closed state, DC current flows through auxiliary branch 2, and when cut-offfing DC Line Fault, DC current is shifted Onto main branch 3.As shown in figure 3, when normally closed state, the second mechanical switch 15, the first mechanical switch 11 and electric power electricity Sub- valve group 13 is in closed state, and third mechanical switch 7, which is in, cut-offs state.When cut-offfing DC Line Fault, electric power electricity will be first turned off Sub- valve group 13, so that direct fault current is transferred in main branch 3, direct fault current will charge to capacitor 10, work as electricity When the voltage of container 10 is higher than bus bar side DC voltage 17, direct fault current will be begun to decline, finally due to the suction of arrester Adduction and be finally reduced to zero.
The instruction cut-off, the first mechanical switch 11 are issued while turning off power electronics valve group 13 to the first mechanical switch 11 Contact receive cut-off instruction after start sub-switching operation and by the regular hour, the distance between contact reaches specified Stroke, during the contact separation of the first mechanical switch 11, the voltage of capacitor 10 is in rising and condenser voltage application On auxiliary branch 2, the first mechanical switch 11 and power electronics valve group 13 on auxiliary branch 2 share capacitance voltage simultaneously.
In one embodiment, power electronics valve group 13 is preferably by antiparallel power electronic devices 13a and inverse parallel Thyristor 13b be connected in series.All-controlling power electronics device 13a has self-switching-off capability and thyristor 13b only in electric current It can be just turned off when zero passage and receiving reverse BV.Full-control type power electronic will be given simultaneously when turning off power electronics valve group 13 Device 13a and thyristor 13b applies cut-off signals, and all-controlling power electronics device 13a can be quickly after receiving cut-off signals It turns off fastly, so that the electric current of auxiliary branch is reduced to zero, and then provides condition, 13a and 13b for the shutdown of thyristor 13b After being turned off, 13a and 13b will share in series the voltage being applied in power electronics valve group 13, specified due to thyristor 13b Voltage is usually above all-controlling power electronics device 13a and cost is lower than all-controlling power electronics device 13a, by using full control Power electronics can be significantly reduced in the method for type power electronic devices 13a and thyristor 13b power electronics valve group 13 in series The cost of valve group 13.
After dc circuit breaker completes DC Line Fault isolated operation, the voltage of capacitor 10 will be charged to higher voltage value. In order to enable dc circuit breaker completes that reclosing operation can be carried out after once cut-offfing operation, need first to discharge to capacitor 10. As shown in figure 3, in one embodiment, in the positive and negative electrode parallel discharge branch 6 of capacitor 10.The discharge paths 6 are by third machine Tool switch 7 and resistance 8 are connected in series, and the closure of third mechanical switch 7 can discharge to capacitor 10.
It is necessary to ensure that DC Line Fault has been removed before discharging to capacitor 10, criterion is detection dc circuit breaker line side 14 DC voltage, when the absolute value of the DC voltage in dc circuit breaker line side 14 is persistently higher than a certain lowest threshold (such as volume Determine the 80% of DC voltage), then judge that DC Line Fault is removed.
Shown in Fig. 3, the reclosing operation timing of dc circuit breaker are as follows: be first closed the first machinery after receiving reclosing instruction Switch 11 then opens power electronics valve group 13.
Dc circuit breaker reclosing needs to judge whether DC Line Fault has disappeared before DC Line Fault, reclosing in order to prevent It removes, criterion is to detect the DC voltage in dc circuit breaker line side 14, when the DC voltage in dc circuit breaker line side 14 Absolute value be persistently higher than it is a certain be greater than zero threshold value (such as 80% of rated direct voltage), then judge that DC Line Fault is clear It removes.
Before reclosing, DC power transmission line is generally light condition, in one embodiment, disconnected in direct current in order to prevent There is excessively high switching overvoltage in road device line side 14, can be in 14 zinc oxide surge arresters 18 of dc circuit breaker line side.
In order to further enhance the efficiency of reclosing, make the delay reduction to clamp on, thus accelerate the time to restore electricity, Further optimization can be carried out to dc circuit breaker structure, increase capacitors count or simultaneously specifically in main branch 3 Increase the quantity of capacitor and corresponding discharge paths, such as increasing is two or more capacitors, and/or simultaneously Corresponding matching increases corresponding discharge paths, series connection mechanical switch.
As shown in figure 4, in one embodiment, containing two group capacitors and correspondence in the main branch 3 of dc circuit breaker Discharge paths and series connection mechanical switch.As shown in figure 4, it includes two capacitors 10a and 10b, the both ends point of 10a and 10b Not in parallel discharge paths 6a and 6b, also connected mechanical switch 9a and 9b for the outside of capacitor 10a and 10b.Normally shape When state, only one of them mechanical switch is in closed state in each tandem compound in main branch, and in other tandem compounds Mechanical switch is in an off state.For example, 9a closure, to which capacitor 10a is accessed to major loop, 9b, which is in, cut-offs state.
When DC Line Fault occurs, it is first turned off power electronic devices valve group, while opening to the first machinery on auxiliary branch It closes to issue and cut-offs instruction, after DC current is reduced to zero in transmission line of electricity, opens to be in one of them described tandem compound and close 4th mechanical switch of conjunction state realizes that direct fault current is cut-off.There is the second mechanical switch in one embodiment, then then The second mechanical switch of auxiliary branch external series connection is opened, realizes that direct fault current is cut-off.
After dc circuit breaker is completed to cut-off direct fault current for the first time, capacitor 10a will be charged to high voltage, be Facilitate it is subsequent can high-speed reclosure, when route DC current is reduced to zero, mechanical switch 9a will be opened.
After receiving reclosing instruction, one is initially in the state of cut-offfing in several tandem compounds in closure main branch inside The 4th mechanical switch, then be closed auxiliary branch in the first mechanical switch, finally open auxiliary branch power electronic devices Valve group realizes high-speed reclosure and restores direct current supply.It specifically, will successively after dc circuit breaker receives reclosing instruction It is closed mechanical switch 9b, the first mechanical switch 11 and power electronics valve group 13.After dc circuit breaker enters steady operational status, It will be closed mechanical switch 9a, discharged charged capacitor 10a, so that capacitor 10a can be used for next isolated DC event Hinder electric current.
Equally, it in the embodiment, needs to ensure that DC Line Fault has been removed before dc circuit breaker reclosing, judges DC Line Fault The method whether removed is the voltage for monitoring dc circuit breaker line side 14, when the absolute value of the voltage value is higher than certain threshold value (such as 80% of rated direct voltage) then judges that DC Line Fault has been removed, can start closing operation.
When DC line is shorter, in order to enable the line side 14 of dc circuit breaker has foot after DC Line Fault is removed Enough high residual voltages, the present invention provides a kind of in the additional scheme in parallel containing capacitor branches in the line side of dc circuit breaker 14, As shown in figure 5, in the additional parallel connection in the line side of dc circuit breaker 14 series loop being made of capacitor 19 and resistance 18.
Fig. 6 gives another embodiment of reversible capacitance charge type dc circuit breaker, and principle is similar with Fig. 3 Fig. 5, difference It is, main branch is coupled by the identical capacitive series branch reverse parallel connection of two structures, wherein first capacitor series connection branch It routes the 4th mechanical switch 9a, DC capacitor 10a and diode valve group 5a to be connected in series, the both ends DC capacitor 10a are in parallel simultaneously The discharge paths being connected in series by third mechanical switch 7a and discharge resistance 8a, the second capacitive series branch structure and the first electricity Appearance series arm is identical, and the mode of connection is on the contrary, that is to say the second capacitive series branch by diode valve group 5a, DC capacitor 10a It is connected in series with the 4th mechanical switch 9a, and the 4th mechanical switch 9a and the second capacitive series branch of first capacitor series arm The connection of diode valve group 5a cathode, and the cathode of first capacitor series arm and the 4th machinery of the second capacitive series branch are opened Close the connection of the one end 9a.
Fig. 7 gives a kind of reversible capacitance charge type direct-current breaker topology for DC distribution net, principle and figure 3- Fig. 6 is similar, and it includes power electronics valve group 13 that difference, which is the auxiliary branch only, does not include the first mechanical switch 11.Direct current In the closure state, power electronics valve group 13 is opened breaker, and when cut-offfing dc circuit breaker, power electronics valve group 13 will be by Shutdown, direct fault current will be transferred to main branch 3, and when being turned off due to power electronics valve group 13, direct fault current is still It can circulate by main branch 3, therefore, power electronics valve group 13 will not generate excessively high transient voltage or transient current when turning off, To reduce the requirement to the rated direct voltage, DC current of power electronics valve group 13.In order to improve turn-off speed, actually make Used time can also leave out direct current current-limiting inductance 16.
Capacitor charging type bidirectional, dc breaker provided by the invention can be used for cut-offfing direct fault current, distinguishing feature It is that main branch is composed of single-phase uncontrollable rectifier bridge and capacitor-mechanical switch capacitive series branch, to utilize direct current Fault current uniaxially charges to capacitor, eliminates existing inductor-capacitor resonance problems after cut-offfing DC Line Fault, and should Branch has two-way through-current capability.In addition, the power electronics valve group of auxiliary branch using all-controlling power electronics device valve group and Half control type power electronic devices valve group is connected in series to reduce the cost of auxiliary branch power electronics valve group.Moreover, this hair The bright single combination of parallel combination substitution by multiple " mechanical switch-capacitor " further provided for is so that designed is straight Stream breaker has high-speed reclosure ability, greatly improves the speed of system resumes power after DC Line Fault.
As it will be easily appreciated by one skilled in the art that the foregoing is merely illustrative of the preferred embodiments of the present invention, not to The limitation present invention, any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should all include Within protection scope of the present invention.

Claims (10)

1. a kind of capacitor charging type bidirectional, dc breaker comprising auxiliary branch and main branch in parallel, wherein the auxiliary Branch includes power electronic devices valve group, and DC current when using as dc circuit breaker normally flows through branch;
It is characterized in that, the main branch is by single-phase uncontrollable rectifier bridge and the electricity being composed in series by DC capacitor and mechanical switch Appearance-mechanical switch branch combinations form, wherein the input port of the single-phase uncontrollable rectifier bridge respectively with auxiliary branch two A port is connected, capacitor-mechanical switch described in coupled in series between the high and low pressure DC port of the single-phase uncontrollable rectifier bridge Branch;
The power electronic devices valve group of the auxiliary branch by anti-series all-controlling power electronics device and antiparallel brilliant lock Pipe is connected in series;The outside for the shunt circuit that the main branch and auxiliary branch are constituted also has been connected current-limiting inductance, with limitation The climbing speed of direct fault current;Single-phase uncontrollable rectifier bridge is used for the two-way through-current capability of main branch, and can prevent DC current is further changed to negative value and forms inductance-so as to cause DC capacitor and current-limiting inductance or line inductance after being reduced to zero Capacitive tank.
2. capacitor charging type bidirectional, dc breaker according to claim 1, which is characterized in that wherein, the main branch DC capacitor two sides be also parallel with discharge paths, for before dc circuit breaker reclosing to the DC capacitor discharge.
3. capacitor charging type bidirectional, dc breaker according to claim 2, which is characterized in that wherein, the electric discharge branch Road includes the mechanical switch and resistance being serially connected.
4. capacitor charging type bidirectional, dc breaker according to claim 2 or 3, which is characterized in that wherein, in main branch Middle increase DC capacitor quantity, and/or also corresponding matching increases corresponding discharge paths, mechanical switch, each direct current simultaneously Hold and corresponding mechanical switch of connecting after corresponding discharge paths parallel connection.
5. capacitor charging type bidirectional, dc breaker according to claim 1-3, which is characterized in that wherein, also Including the third branch in parallel with the auxiliary branch and main branch, which routes an arrester or by multiple arrester It forms in series and parallel.
6. capacitor charging type bidirectional, dc breaker according to claim 1-3, which is characterized in that wherein, institute Whether the line side for stating dc circuit breaker is additionally parallel with DC capacitor, for judging whether DC Line Fault is removed, using as weighing The condition of combined floodgate.
7. capacitor charging type bidirectional, dc breaker according to claim 1-3, which is characterized in that wherein, institute Stating auxiliary branch further includes the first mechanical switch, and first mechanical switch and power electronic devices valve group connect to form the auxiliary Branch;And/or the outside of the shunt circuit of the main branch and auxiliary branch composition is also in series with the second mechanical switch.
8. a kind of method for carrying out DC Line Fault isolation using the described in any item dc circuit breakers of claim 1-3, feature It is, wherein when this method is included in generation DC Line Fault, the power electronic devices valve group of auxiliary branch is turned off, thus by event Barrier electric current is transferred to main branch and charges to the DC capacitor, is higher than dc circuit breaker bus bar side direct current to the DC capacitor voltage When voltage, fault current is off, and realizes DC Line Fault isolation.
9. a kind of method for carrying out DC Line Fault isolation using dc circuit breaker as claimed in claim 7, which is characterized in that its In, when this method is included in generation DC Line Fault, the power electronic devices valve group being first turned off in the auxiliary branch is then opened The first mechanical switch on the auxiliary branch;Or it is first turned off the power electronic devices valve group in the auxiliary branch, then beat The first mechanical switch on the auxiliary branch is opened, and after route DC current is reduced to zero, opens auxiliary branch external series Second mechanical switch of connection, to realize the isolation to DC Line Fault.
10. a kind of reclosing method carried out after DC Line Fault isolation using dc circuit breaker as claimed in claim 7, feature Be, wherein this method is included in receive reclosing instruction after, the first mechanical switch being first closed on auxiliary branch then is opened Lead to the power electronic devices valve group;Alternatively, being first closed the connection of auxiliary branch external series after receiving reclosing instruction Second mechanical switch, the first mechanical switch being then closed on auxiliary branch, finally opens the power electronic devices valve group.
CN201610630952.0A 2016-08-04 2016-08-04 A kind of capacitor charging type bidirectional, dc breaker and its application CN106099878B (en)

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