CN105656019A - Capacitive charging DC breaker and application thereof - Google Patents

Capacitive charging DC breaker and application thereof Download PDF

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Publication number
CN105656019A
CN105656019A CN201610051145.3A CN201610051145A CN105656019A CN 105656019 A CN105656019 A CN 105656019A CN 201610051145 A CN201610051145 A CN 201610051145A CN 105656019 A CN105656019 A CN 105656019A
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CN
China
Prior art keywords
circuit breaker
branch
mechanical switch
current
capacitor
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CN201610051145.3A
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Chinese (zh)
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CN105656019B (en
Inventor
林卫星
周猛
文劲宇
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华中科技大学
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Publication of CN105656019B publication Critical patent/CN105656019B/en

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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J1/00Circuit arrangements for dc mains or dc distribution networks
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02HEMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/08Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
    • H02H3/087Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current for dc applications

Abstract

The invention discloses a capacitive charging DC breaker. The capacitive charging DC breaker comprises an auxiliary branch and a primary branch, which are connected with each other in parallel, wherein the auxiliary branch is formed by connecting a first mechanical switch and a power electronic device valve bank in series; and the primary branch is formed by connecting DC capacitors and a diode valve bank in series. A DC fault current is isolated through the charging effect of a DC to each DC capacitor during a DC fault period. A reclosing instruction is sent out only when the condition that a line side current of the DC breaker is higher than a threshold is detected in the reclosing process. The invention further discloses the DC breaker. The primary branch is formed by connecting multiple groups of DC capacitors which are connected with one another in series and the mechanical switches in parallel. The invention further discloses a control method for carrying out fast reclosing on the DC breaker correspondingly. The defect that inductance-capacitance oscillation is easily formed by the DC capacitors and line inductor of the existing DC breaker can be avoided; opening and closing of the DC fault current are stable and reliable; and fast reclosing can be achieved.

Description

A kind of electric capacity charge type dc circuit breaker and application thereof

Technical field

The invention belongs to power system power transmission and distribution technical field, more particularly, to a kind of electric capacity charge type dc circuit breaker and the application in carrying out DC Line Fault isolation thereof.

Background technology

Along with the development of modularization multi-level converter, utilizing modularization multi-level converter to constitute direct current network is the focus that power industry circle receives much concern in recent years. Direct current network needs at DC side, DC power transmission line to be interconnected, when there is DC Line Fault, it is necessary to quickly isolating faulty line to avoid direct current network collapse of voltage, for this, dc circuit breaker is the device that large-sized DC electrical network is indispensable.

Solid-state switch branch breaker is a kind of typical dc circuit breaker, it is in series by large number of all-controlling power electronics device, this dc circuit breaker its cut-off the speed of direct fault current quickly, can soon to hundreds of delicate, but what the program existed major drawback is that owing to needing large number of all-controlling power electronics device, its cost is high, and conduction loss is high, and the series connection of multiple all-controlling power electronics device brings the defect all pressing difficulty.

For the loss high defect overcoming solid-state switch branch breaker to exist, prior art exists a kind of mixed type high voltage DC breaker, it is mainly formed by auxiliary branch and solid-state switch branch circuit parallel connection, wherein auxiliary branch is in series by all-controlling power electronics device and Fast mechanical switch, and solid-state switch branch road is basically identical with solid-state switch dc circuit breaker, large number of all-controlling power electronics device it is in series. During normal operation, auxiliary branch and solid-state switch branch road are simultaneously in conducting state, owing to the conducting resistance of solid-state switch branch road is far above auxiliary branch, DC current mainly circulates through auxiliary branch, electric current on solid-state switch branch road is almost nil, so that mixed type high voltage DC breaker overcomes the defect that solid-state switch dc circuit breaker loss is high. When cut-offfing direct fault current, by being first turned off the all-controlling power electronics device assisting direct current thus DC current being transferred to solid-state switch branch road, then by the spark gap isolated DC fault current of solid-state switch branch road and parallel connection thereof.This mixed type high voltage DC breaker has the advantage that loss is low, but owing to still comprising solid-state switch branch road, its cost is more taller than solid-state switch dc circuit breaker, during turning off, its solid-state switch branch road absorbs substantial amounts of energy simultaneously, make solid-state switch branch road that operation in the short time, cannot be turned off continuously, thus mixed type high voltage DC breaker does not possess the ability of high-speed reclosure, the power supply speed after causing trouble recovery is slow.

A kind of mixed type high voltage DC breaker disclosed in patent documentation WO2013/093066A, as shown in Figure 1, it includes main branch 24 and auxiliary branch 28, wherein main branch 24 includes the mechanical switch 3 and the power electronic devices valve group 4 that are serially connected, auxiliary branch 28 is in parallel with main branch 24, and it includes capacitor 5. when this type dc circuit breaker is by DC Line Fault, fault current is transferred to the mode of capacitor 5, realize isolated DC fault, it can overcome the defect such as mixed type high voltage DC breaker main branch defect with high costs of routine, but, it is because current-limiting inductance 2 and capacitor 5 constitute series loop, there is inductor-capacitor resonance in it on the one hand during cut-offfing fault current, need to turn off direct fault current through the long period, it completes once to close to have no progeny simultaneously, the voltage of its capacitor 5 is charged to high pressure conditions, need to realize reclosing to after electric capacity 5 electric discharge, and electric capacity 5 electric discharge is needed the regular hour, high-speed reclosure cannot be realized for this such scheme, and its power electronic devices valve group 4 is all made up of all-controlling power electronics device, power electronic devices valve group 4 is relatively costly.

Summary of the invention

Disadvantages described above or Improvement requirement for prior art, the invention provides a kind of electric capacity charge type dc circuit breaker, by improving the structure of mixed type high voltage DC breaker, when making isolated DC fault, the DC capacitor of current dc circuit breaker and line inductance can be avoided easily to form the defect of inductor-capacitor vibration, and its to cut-off direct fault current reliable and stable.

For achieving the above object, according to one aspect of the present invention, it is provided that a kind of electric capacity charge type dc circuit breaker, it auxiliary branch including parallel connection and main branch, wherein,

Described auxiliary branch is in series by mechanical switch and power electronic devices valve group, using the branch road that DC current during as normally flows through;

Described main branch is in series by DC capacitor and diode valve group, fault current is transferred to this branch road for turning off auxiliary branch when needs cut-off direct fault current by it, and begin to decline and finally reduce to zero by the DC current when DC capacitor voltage is higher than dc circuit breaker bus bar side DC voltage and realize cut-offfing fault current, and prevent DC current to be further changed to negative value after reducing to zero by diode valve group and realize preventing DC capacitor and line inductance from forming inductor-capacitor vibration.

The above-mentioned dc circuit breaker of the present invention, it is when normally, and the mechanical switch of auxiliary branch and power electronic devices valve group are all in closure state, and DC current flows through auxiliary branch. When needing breaking direct current, by the mechanical switch of the power electronic devices valve group and auxiliary branch that are first turned off auxiliary branch, DC current is transferred to DC capacitor is charged by main branch, when DC capacitor voltage is higher than dc circuit breaker bus bar side DC voltage, DC current begins to decline and finally reduces to zero, realization is cut-off, and diode valve group can prevent DC current from reducing to the value being further changed to bear after zero thus preventing DC capacitor and line inductance from forming inductor-capacitor vibration.

As present invention further optimization, the auxiliary branch of described dc circuit breaker and main branch being gone back parallel connection the 3rd branch road, the 3rd route a spark gap or is formed by multiple spark gap serial or parallel connections.

As present invention further optimization, also connected direct current current-limiting inductance in the outside of the shunt circuit that the main branch of described dc circuit breaker and auxiliary branch are constituted, to limit the climbing speed of direct fault current.

As present invention further optimization, described dc circuit breaker main branch and outside also coupled in series second mechanical switch of shunt circuit that constitutes of auxiliary branch, after breaking direct current for good and all isolated DC chopper thus prevent bus bar side DC voltage to be continuously applied the spark gap at the 3rd branch road.

As present invention further optimization, the power electronic devices valve group of described auxiliary branch is in series by other power electronic devices such as IGCT, the turn-off thyristor etc. of the all-controlling power electronics device (such as insulated gate bipolar transistor) that can rapidly switch off and slower speed, and such scheme can make whole installation cost be substantially reduced.

As present invention further optimization, the DC capacitor both sides of described main branch are also parallel with discharge loop, first this DC capacitor are discharged to before dc circuit breaker reclosing.

As present invention further optimization, described discharge loop is formed by mechanical switch and resistant series.

As present invention further optimization, additionally it is parallel with DC capacitor in the line side of dc circuit breaker, reliably to judge whether DC Line Fault is removed, thus for reclosing.

As present invention further optimization, on the DC capacitor of described extra parallel connection, also coupled in series has resistance.

According to another aspect of the present invention, thering is provided a kind of method utilizing described dc circuit breaker to carry out DC Line Fault isolation, wherein, the method includes when there is DC Line Fault, it is first turned off the power electronic devices valve group in described auxiliary branch, then opens the mechanical switch on described auxiliary branch.

As present invention further optimization, open the mechanical switch on described auxiliary branch and after DC current reduces to zero, open the second mechanical switch that external series couples.

According to another aspect of the present invention, there is provided a kind of utilization described the dc circuit breaker of high-speed reclosure can carry out the reclosing method after DC Line Fault isolation, wherein, the method includes after receiving reclosing instruction, the first mechanical switch on Guan Bi auxiliary branch, then open described power electronic devices valve group.

As present invention further optimization, before the mechanical switch on Guan Bi auxiliary branch, the mechanical switch that first Guan Bi external series couples.

It is another aspect of this invention to provide that provide a kind of can the capacity-charging dc circuit breaker of high-speed reclosure, after isolated DC fault, high-speed reclosure operation can be carried out, it is characterised in that this dc circuit breaker is formed in parallel by auxiliary branch and main branch without waiting for electric capacity electric discharge, wherein

Described auxiliary branch is in series by mechanical switch and power electronics valve group, using the branch road that DC current during as normally flows through;

Described main branch includes many groups tandem compound of parallel connection, wherein often group tandem compound is formed by the 4th mechanical switch and DC capacitor series connection, this main branch is for turning off auxiliary branch when needs cut-off direct fault current and being transferred into this branch road, and begin to decline and finally reduce to zero by the DC current when DC capacitor voltage is higher than dc circuit breaker bus bar side DC voltage and realize cut-offfing, and prevent DC capacitor and line inductance from forming inductor-capacitor vibration by preventing DC current to be further changed to negative value after reducing to zero, and can realize namely carrying out high-speed reclosure without waiting for electric capacity electric discharge.

As present invention further optimization, during normally closed state, in each tandem compound, only one mechanical switch is in closure state, and the mechanical switch in other tandem compounds is in the state of cut-offfing.

As present invention further optimization, the DC capacitor in each tandem compound is parallel with discharge loop, first cut-offs, before this DC capacitor is discharged, the 4th mechanical switch connected with this DC capacitor.

As present invention further optimization, the auxiliary branch of described dc circuit breaker and main branch being gone back parallel connection the 3rd branch road, the 3rd route a spark gap or is formed by multiple spark gap serial or parallel connections.

As present invention further optimization, also connected direct current current-limiting inductance in the outside of the shunt circuit that the main branch of described dc circuit breaker and auxiliary branch are constituted, to limit the climbing speed of direct fault current.

As present invention further optimization, described dc circuit breaker main branch and outside also coupled in series second mechanical switch of shunt circuit that constitutes of auxiliary branch, after breaking direct current for good and all isolated DC chopper thus prevent bus bar side DC voltage to be continuously applied at spark gap.

As present invention further optimization, the power electronic devices valve group of described auxiliary branch is in series by other power electronic devices such as IGCT, the turn-off thyristor etc. of quick all-controlling power electronics device (such as igbt) and slower speed, and such scheme can make whole installation cost be substantially reduced.

As present invention further optimization, additionally it is parallel with DC capacitor in the line side of dc circuit breaker, reliably to judge whether DC Line Fault is removed, thus for reclosing.

As present invention further optimization, on the DC capacitor of described extra parallel connection, also coupled in series has resistance.

Preferably, described main branch also includes diode valve group, and it is connected with many groups tandem compound in parallel.

According to another aspect of the present invention, there is provided a kind of utilize described can the dc circuit breaker of the high-speed reclosure method that carries out DC Line Fault isolation, wherein, the method includes when there is DC Line Fault, it is first turned off power electronic devices valve group, sends to the mechanical switch on auxiliary branch simultaneously and cut-off instruction, after DC current reduces to zero, open the mechanical switch being in closure state in one of them described tandem compound, it is achieved direct fault current cut-offs.

According to another aspect of the present invention, there is provided a kind of utilization described the dc circuit breaker of high-speed reclosure can carry out the reclosing method after DC Line Fault isolation and after Failure elimination, wherein, the method includes after receiving reclosing instruction, close the 4th mechanical switch being initially in the state of cut-offfing, then close the first mechanical switch, then open power electronic devices valve group, it is achieved reclosing fast quick-recovery direct current supply.

As present invention further optimization, after true DC Line Fault is removed, just send reclosing instruction.

As present invention further optimization, judge whether DC Line Fault has been cleared by by detecting the DC voltage value in dc circuit breaker line side, when the absolute value of dc circuit breaker line side DC voltage is higher than certain threshold value, then judge that DC Line Fault has been cleared by.

In general, by the contemplated above technical scheme of the present invention compared with prior art, it is possible to obtain following beneficial effect:

(1) dc circuit breaker of the present invention, its main branch adopts the scheme of DC capacitor and the series connection of diode valve group thus utilizing direct fault current uniaxially to charge to DC capacitor, eliminates the inductor-capacitor resonance problems existed after cut-offfing DC Line Fault;

(2) its auxiliary branch of dc circuit breaker of the present invention power electronics valve group adopt fast power electronic valve device group and at a slow speed power electronic devices valve group be in series thus reducing the cost of power electronics valve group, greatly reduce the quasiconductor cost of main branch;

(3) dc circuit breaker of the present invention, the parallel combination of its multiple " mechanical switch-DC capacitors " substitutes single direct current capacitors so that designed dc circuit breaker possesses high-speed reclosure ability, is greatly improved the speed of system resumes power after DC Line Fault.

(4) dc circuit breaker of the present invention is compared and conventional mechanical type dc circuit breaker, will not produce electric arc thus substantially increasing dc circuit breaker to cut-off the reliability of direct fault current during isolated DC fault.

Accompanying drawing explanation

Fig. 1 is the mixed type high-voltage direct-current breaker topology that existing a kind of main branch is made up of DC capacitor.

Fig. 2 is the embodiment of a kind of electric capacity charge type dc circuit breaker.

Fig. 3 is that main branch is by the dc circuit breaker being in series with diode valve group again after multiple four mechanical switchs-capacitor tandem compound parallel connection.

Fig. 4 is the dc circuit breaker comprising multiple four mechanical switchs-DC capacitor tandem compound in main branch.

Fig. 5 is the dc circuit breaker of DC capacitor additionally in parallel in the line side of dc circuit breaker.

Detailed description of the invention

In order to make the purpose of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated. Should be appreciated that specific embodiment described herein is only in order to explain the present invention, is not intended to limit the present invention. As long as just can be mutually combined additionally, technical characteristic involved in each embodiment of invention described below does not constitute conflict each other.

Fig. 2 show one embodiment of the invention the electrical block diagram of electric capacity charge type dc circuit breaker 1. In Fig. 2, dc circuit breaker 1 is mainly formed in parallel by auxiliary branch 2 and main branch 3, and wherein auxiliary branch 2 is in series by the first mechanical switch 8 and power electronics valve group 9, and main branch is in series by direct current capacitors 10 and diode valve group 11.

In order to prevent DC capacitor voltage from rising too high, in a preferred embodiment, auxiliary branch 2 and the 3rd branch road that can also in parallel be made up of spark gap 5 in main branch 3.

Make spark gap 5 overheated because of leakage current on spark gap 5 to prevent DC voltage to be continuously applied, in a preferred embodiment, also can connect the second mechanical switch 6 in the outside of the shunt circuit that auxiliary branch 2, main branch 3 are constituted. In another embodiment, external series second mechanical switch 6 of the shunt circuit that auxiliary branch 2, main branch 3 and the 3rd branch road 5 are constituted.

In order to provide discharge path to DC capacitor 10, in a preferred embodiment, the two ends of DC capacitor 10 are also in parallel discharge loop 4, discharge loop 4 is in series by the 3rd mechanical switch 12 and discharge resistance 13, DC capacitor 10 can be made to discharge through discharge paths 4 by closing the 3rd mechanical switch 12.

During lowering DC Line Fault, the climbing speed of direct fault current, in a preferred embodiment, the outside of the shunt circuit that auxiliary branch 2, main branch 3 are constituted also can series direct current current-limiting inductance 7. In a further advantageous embodiment, the external series direct current current-limiting inductance 7 of the shunt circuit that auxiliary branch 2, main branch 3 and the 3rd branch road are constituted.

During normally closed state, DC current flows through auxiliary branch 2, and when cut-offfing DC Line Fault, is transferred to by DC current in main branch 3. As in figure 2 it is shown, in the embodiment shown in Figure 2, during normally closed state, second mechanical switch the 6, first mechanical switch 8 and power electronics valve group 9 are in closure state, and the 3rd mechanical switch 4 is in the state of cut-offfing. When cut-offfing DC Line Fault, to be first turned off power electronics valve group 9, thus being transferred to by DC current in main branch 3, DC current will charge to DC capacitor 10, when the voltage of DC capacitor 10 is higher than bus bar side DC voltage 15, DC current will begin to decline until reducing to zero.

Send the instruction cut-off can to while turning off power electronics valve group 9 first mechanical switch 8, the contact of the first mechanical switch 8 receive cut-off instruction after start sub-switching operation and through the regular hour, distance between its contact reaches rated travel, during the contact of the first mechanical switch 8 separates, the voltage of DC capacitor 10 is applied on auxiliary branch 2 in rising and this DC capacitor voltage, and the first mechanical switch 8 and power electronics valve group 9 on auxiliary branch 2 share DC capacitor voltage simultaneously.

In one embodiment, power electronics valve group 9 is preferably in series by all-controlling power electronics device 9a and IGCT 9b. wherein, all-controlling power electronics device 9a possesses self-switching-off capability and IGCT 9b only just can be turned off when current over-zero. cut-off signals will be applied to all-controlling power electronics device 9a and IGCT 9b when turning off power electronics valve group 9 simultaneously, all-controlling power electronics device 9a can quickly turn off after receiving cut-off signals very much, thus the electric current of auxiliary branch is reduced to zero, and then the shutoff for IGCT 9b provides condition, after 9a and 9b is both off, 9a and 9b will in series share the voltage being applied in power electronics valve group 9, due to the rated voltage of IGCT 9b usually above all-controlling power electronics device 9a and cost lower than all-controlling power electronics device 9a, by adopting the method for all-controlling power electronics device 9a and IGCT 9b power electronics valve group 9 in series can reduce the cost of power electronics valve group 9.

After dc circuit breaker shown in Fig. 2 completes DC Line Fault isolated operation, the voltage of DC capacitor 10 will be charged to high-voltage value, so that dc circuit breaker can carry out reclosing operation after completing once to cut-off operation, need first DC capacitor 10 to be discharged, for this, in one embodiment, it is possible in the positive and negative electrode parallel discharge loop 4 of DC capacitor 10. Discharge loop 4 is in series by the 3rd mechanical switch 12 and resistance 13. 3rd mechanical switch 12 is closed and can DC capacitor 10 be discharged.

It is necessary to ensure that DC Line Fault is removed before discharging to DC capacitor 10, its criterion is the DC voltage in detection dc circuit breaker line side 16, when the absolute value of the DC voltage in dc circuit breaker line side 16 is persistently higher than a certain lowest threshold (such as 2kV), then judge that DC Line Fault is eliminated.

The reclosing operation sequential of dc circuit breaker shown in Fig. 2 is: first close the first mechanical switch 8 after receiving reclosing instruction, then opens power electronics valve group 9.

In order to prevent dc circuit breaker reclosing in DC Line Fault, need before reclosing to judge whether DC Line Fault eliminates, its criterion is the DC voltage in detection dc circuit breaker line side 16, when the absolute value of the DC voltage in dc circuit breaker line side 16 is persistently higher than a certain threshold value (such as 2kV) more than zero, then judge that DC Line Fault is eliminated.

Before reclosing, DC line 17 is generally Light Condition, in one embodiment, in order to prevent too high switching overvoltage occur in dc circuit breaker line side 16, it is possible at dc circuit breaker line side 16 zinc oxide surge arresters 18.

As it is shown on figure 3, in another embodiment, in order to promote the efficiency of reclosing further so that the delay reduction of wait, thus accelerating the time restored electricity, the dc circuit breaker structure shown in Fig. 2 is carried out further optimization.

Dc circuit breaker in Fig. 3, relative to the scheme described in Fig. 2, contains discharge paths and the series connection mechanical switch of many group DC capacitors and correspondence in its main branch 3. As it is shown on figure 3, parallel connection discharge loop 4a and 4b is distinguished at the two ends comprising two DC capacitors 10a and 10b, 10a and 10b, also connected mechanical switch 14a and 14b in the outside of DC capacitor 10a and 10b. During normally state, only one group of DC capacitor comes into operation, for instance, 14a closes thus DC capacitor 10a is accessed to major loop, and 14b is in the state of cut-offfing.

When dc circuit breaker complete first time cut-off direct fault current after, DC capacitor 10a will be charged to high voltage, in order to facilitate follow-up energy high-speed reclosure, when DC current reduces to zero, mechanical switch 14a will be opened.

After dc circuit breaker receives reclosing instruction, mechanical switch 14b will be closed successively, the first mechanical switch 8 and power electronics valve group 9. After dc circuit breaker enters steady operational status, mechanical switch 12a will be closed, to charged DC capacitor 10a electric discharge so that DC capacitor 10a can be used for isolated DC fault current next time.

Equally, in this embodiment, need before dc circuit breaker reclosing to guarantee that DC Line Fault is removed, judge the voltage that the method whether DC Line Fault has been removed is monitoring dc circuit breaker line side 16, when the absolute value of this magnitude of voltage is higher than certain threshold value (such as representative value 2kV), then judge that DC Line Fault is removed, it is possible to start closing operation.

When DC line is shorter, so that after DC Line Fault is eliminated, the line side 16 of dc circuit breaker possesses sufficiently high residual voltage, the invention provides the extra scheme containing DC capacitor branch road in parallel in a kind of line side 16 at dc circuit breaker, as it is shown in figure 5, the extra in parallel series loop being made up of DC capacitor 17 and resistance 18 in the line side 16 of dc circuit breaker.

In order to reduce the cost of dc circuit breaker, and making dc circuit breaker possess high-speed reclosure ability, Fig. 4 gives the direct-current breaker topology removing diode valve group 11. Its structure is similar with Fig. 3, differs only in the diode valve group 11 deleted in main branch.

In the embodiment of Fig. 2-Fig. 5, dc circuit breaker 1 is all connected to positive polarity DC line, when dc circuit breaker needs to be connected to negative polarity d. c circuit, need to turn the positive and negative polarity of dc circuit breaker 1, it is connected with negative DC bus by 16, bus bar side 19 is connected with external dc transmission line of electricity.

Electric capacity charge type dc circuit breaker provided by the invention can be used for cut-offfing direct fault current, its distinguishing feature is in that main branch adopts the scheme of DC capacitor and the series connection of diode valve group thus utilizing direct fault current uniaxially to charge to DC capacitor, eliminate the inductor-capacitor resonance problems existed after cut-offfing DC Line Fault, additionally, the power electronics valve group of auxiliary branch adopt fast power electronic valve device group and at a slow speed power electronic devices valve group be in series thus reducing the cost of power electronics valve group, and greatly reduce the quasiconductor cost of main branch, and, what the present invention further provides is substituted single direct current capacitors so that designed dc circuit breaker possesses high-speed reclosure ability by the parallel combination of multiple " mechanical switch-DC capacitors ", it is greatly improved the speed of system resumes power after DC Line Fault.

Those skilled in the art will readily understand; the foregoing is only presently preferred embodiments of the present invention; not in order to limit the present invention, all any amendment, equivalent replacement and improvement etc. made within the spirit and principles in the present invention, should be included within protection scope of the present invention.

Claims (26)

1. an electric capacity charge type dc circuit breaker, it auxiliary branch including parallel connection and main branch, wherein,
Described auxiliary branch is in series by mechanical switch and power electronic devices valve group, using the branch road that DC current during as normally flows through;
Described main branch is in series by DC capacitor and diode valve group, it is transferred into this main branch for turning off auxiliary branch when needs cut-off direct fault current, and by making DC current begin to decline when described DC capacitor voltage is higher than dc circuit breaker bus bar side DC voltage and finally reducing to zero and realize cut-offfing, and prevent DC current to be further changed to negative value after reducing to zero by described diode valve group and realize preventing DC capacitor and line inductance from forming inductor-capacitor vibration.
2. electric capacity charge type dc circuit breaker according to claim 1, wherein, the auxiliary branch of described dc circuit breaker and main branch is gone back parallel connection the 3rd branch road, and the 3rd route a spark gap or formed by multiple spark gap serial or parallel connections.
3. electric capacity charge type dc circuit breaker according to claim 1 and 2, wherein, also connected direct current current-limiting inductance in the outside of the shunt circuit that the main branch of described dc circuit breaker and auxiliary branch are constituted, to limit the climbing speed of direct fault current.
4. the electric capacity charge type dc circuit breaker according to any one of claim 1-3, wherein, the outside also coupled in series of the shunt circuit that the main branch of described dc circuit breaker and auxiliary branch are constituted has mechanical switch, for for good and all isolated DC chopper after breaking direct current.
5. the electric capacity charge type dc circuit breaker according to any one of claim 1-4, wherein, the power electronic devices valve group of described auxiliary branch is in series by IGCT or the turn-off thyristor of quick all-controlling power electronics device and slower speed.
6. the electric capacity charge type dc circuit breaker according to any one of claim 1-5, wherein, the DC capacitor both sides of described main branch are also parallel with discharge loop, first this DC capacitor are discharged to before dc circuit breaker reclosing.
7. the electric capacity charge type dc circuit breaker according to any one of claim 1-6, wherein, is additionally parallel with DC capacitor in the line side of dc circuit breaker, is used for judging whether DC Line Fault is removed, using the condition of reclosing as whether.
8. the method that the dc circuit breaker utilized according to any one of claim 1-3 carries out DC Line Fault isolation, wherein, the method includes, when there is DC Line Fault, being first turned off the power electronic devices valve group in described auxiliary branch, then opening the mechanical switch on described auxiliary branch.
9. the method that the dc circuit breaker utilized according to any one of claim 4-7 carries out DC Line Fault isolation, wherein, the method includes when there is DC Line Fault, it is first turned off the power electronic devices valve group in described auxiliary branch, then open the mechanical switch on described auxiliary branch, and after DC current reduces to zero, open the mechanical switch that external series couples.
10. the dc circuit breaker utilized according to any one of claim 1-3 carries out the reclosing method after DC Line Fault isolation and after Failure elimination, wherein, the method includes after receiving reclosing instruction, the first mechanical switch on Guan Bi auxiliary branch, then open described power electronic devices valve group.
11. the dc circuit breaker utilized according to any one of claim 4-7 carries out the reclosing method after DC Line Fault isolation and after Failure elimination, wherein, the method includes after receiving reclosing instruction, the mechanical switch that first Guan Bi external series couples, first close the mechanical switch on auxiliary branch again, then open described power electronic devices valve group.
12. can the electric capacity conversion type dc circuit breaker of high-speed reclosure, after isolated DC fault, it is not necessary to wait that electric capacity electric discharge can carry out high-speed reclosure operation, it is characterised in that this dc circuit breaker is formed in parallel by auxiliary branch and main branch, wherein,
Described auxiliary branch is in series by mechanical switch and power electronics valve group, using the branch road that DC current during as normally flows through;
Described main branch includes many groups tandem compound of parallel connection, wherein often group tandem compound is formed by mechanical switch and DC capacitor series connection, this main branch is for turning off auxiliary branch when needs cut-off direct fault current and being transferred into this main branch, and by making DC current begin to decline when described DC capacitor voltage is higher than dc circuit breaker bus bar side DC voltage and finally reducing to zero and realize cut-offfing, and prevent DC capacitor and line inductance from forming inductor-capacitor vibration by preventing DC current to be further changed to negative value after reducing to zero, can realize namely carrying out high-speed reclosure without waiting for electric capacity electric discharge.
13. according to claim 12 can the capacity-charging dc circuit breaker of high-speed reclosure, wherein, during normally state, in each tandem compound, only one mechanical switch is in closure state, and the mechanical switch in other tandem compounds is in the state of cut-offfing.
14. according to claim 12 or 13 can the capacity-charging dc circuit breaker of high-speed reclosure, wherein, the DC capacitor in each tandem compound is parallel with discharge loop.
15. according to any one of claim 12-14 can the capacity-charging dc circuit breaker of high-speed reclosure, wherein, going back parallel connection the 3rd branch road on the auxiliary branch of described dc circuit breaker and main branch, the 3rd route a spark gap or is formed by multiple spark gap serial or parallel connections.
16. according to any one of claim 12-15 can the capacity-charging dc circuit breaker of high-speed reclosure, wherein, the outside of the shunt circuit that the main branch of described dc circuit breaker and auxiliary branch are constituted also is in series with direct current current-limiting inductance, to limit the climbing speed of direct fault current.
17. according to any one of claim 12-16 can the capacity-charging dc circuit breaker of high-speed reclosure, wherein, described dc circuit breaker main branch and the outside also coupled in series of shunt circuit that constitutes of auxiliary branch have mechanical switch, for for good and all isolated DC chopper after breaking direct current.
18. according to any one of claim 12-17 can the capacity-charging dc circuit breaker of high-speed reclosure, wherein, the power electronic devices valve group of described auxiliary branch is in series by IGCT or the turn-off thyristor of quick all-controlling power electronics device and slower speed.
19. according to any one of claim 12-18 can the capacity-charging dc circuit breaker of high-speed reclosure, wherein, additionally it is parallel with DC capacitor in the line side of dc circuit breaker, is used for judging whether DC Line Fault is removed, using the condition of reclosing as whether.
20. according to any one of claim 12-19 can the capacity-charging dc circuit breaker of high-speed reclosure, wherein, described main branch also includes diode valve group, and it is connected with many groups tandem compound in parallel.
21. one kind utilize according to any one of claim 12-16 can the dc circuit breaker of the high-speed reclosure method that carries out DC Line Fault isolation, wherein, the method includes when there is DC Line Fault, it is first turned off power electronic devices valve group, send to the mechanical switch on auxiliary branch simultaneously and cut-off instruction, after DC current reduces to zero, open the mechanical switch being in closure state in one of them described tandem compound, it is achieved direct fault current cut-offs.
22. one kind utilize according to any one of claim 17-20 can the dc circuit breaker of the high-speed reclosure method that carries out DC Line Fault isolation, wherein, the method includes when there is DC Line Fault, it is first turned off power electronic devices valve group, send to the mechanical switch on auxiliary branch simultaneously and cut-off instruction, after DC current reduces to zero, open the mechanical switch being in closure state in one of them described tandem compound, and after DC current reduces to zero, open the mechanical switch that external series couples, it is achieved direct fault current cut-offs.
23. one kind utilize according to any one of claim 12-16 the dc circuit breaker of high-speed reclosure can carry out the reclosing method after DC Line Fault isolation and after Failure elimination, wherein, the method includes after receiving reclosing instruction, a mechanical switch being initially in the state of cut-offfing in Guan Bi tandem compound, the then mechanical switch in Guan Bi auxiliary branch, then open power electronic devices valve group, it is achieved reclosing fast quick-recovery direct current supply.
24. one kind utilize according to any one of claim 17-20 the dc circuit breaker of high-speed reclosure can carry out the reclosing method after DC Line Fault isolation and after Failure elimination, wherein, the method includes after receiving reclosing instruction, the mechanical switch that first Guan Bi external series couples, close a mechanical switch being initially in the state of cut-offfing in tandem compound again, the then mechanical switch in Guan Bi auxiliary branch, then open power electronic devices valve group, it is achieved reclosing fast quick-recovery direct current supply.
25. the method according to claim 23 or 24, wherein, after DC Line Fault is removed, just send reclosing instruction.
26. method according to claim 25, wherein, judge whether DC Line Fault has been cleared by by detecting the DC voltage value in dc circuit breaker line side, when dc circuit breaker line side DC voltage is higher than certain threshold value, then judge that DC Line Fault has been cleared by.
CN201610051145.3A 2016-01-26 2016-01-26 A kind of capacitor charging type dc circuit breaker and its application CN105656019B (en)

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