CN105656019B - A kind of capacitor charging type dc circuit breaker and its application - Google Patents
A kind of capacitor charging type dc circuit breaker and its application Download PDFInfo
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- CN105656019B CN105656019B CN201610051145.3A CN201610051145A CN105656019B CN 105656019 B CN105656019 B CN 105656019B CN 201610051145 A CN201610051145 A CN 201610051145A CN 105656019 B CN105656019 B CN 105656019B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
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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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Abstract
The invention discloses a kind of capacitor charging type dc circuit breakers, it includes 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, main branch is connected in series by DC capacitor and diode valve group, by DC current during DC Line Fault to the charge effects isolated DC fault current of DC capacitor.When reclosing, detects and just issue reclosing instruction when dc circuit breaker line side DC voltage is higher than a certain threshold value.The invention also discloses a kind of dc circuit breaker, main branch is formed in parallel by the concatenated DC capacitor of multiple groups and mechanical switch.Invention additionally discloses the control methods for accordingly to carry out dc circuit breaker high-speed reclosure.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
Technical field
The invention belongs to electric system transmission & distribution electro-technical fields, more particularly, to a kind of capacitor charging type direct current interruption
Device 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 branch 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 the series connection of multiple all-controlling power electronics devices brings and presses difficult defect.
To overcome the high defect of loss existing for solid-state switch branch 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.
Summary of the invention
Aiming at the above defects or improvement requirements of the prior art, the present invention provides a kind of capacitor charging type direct current interruptions
Device, by improving the structure of mixed type high voltage DC breaker, so that can avoid current dc circuit breaker when isolated DC failure
DC capacitor and line inductance inductor-capacitor easy to form oscillation defect, and its cut-off direct fault current stabilization can
It leans on.
To achieve the above object, according to one aspect of the present invention, a kind of capacitor charging type dc circuit breaker is provided,
Including auxiliary branch and main branch in parallel, wherein
The auxiliary branch is connected in series by mechanical switch and power electronic devices valve group, direct current when using as normally
The branch that electric current flows through；
The main branch is connected in series by DC capacitor and diode valve group, is used to need to cut-off direct fault current
When shutdown auxiliary branch by fault current be transferred to the branch road, and by DC capacitor voltage be higher than dc circuit breaker bus
DC current begins to decline and is finally reduced to zero and realizes and cut-off fault current when the DC voltage of side, and anti-by diode valve group
Negative value is further changed to after only DC current is reduced to zero and realizes that preventing DC capacitor and line inductance from forming inductor-capacitor shakes
It swings.
Above-mentioned dc circuit breaker of the invention, in normally, the mechanical switch and power electronics device of auxiliary branch
Part valve group flows through auxiliary branch all in closed state, DC current.When needing breaking direct current, auxiliary branch will be first turned off
Power electronic devices valve group and auxiliary branch mechanical switch DC capacitor is filled so that DC current is transferred in main branch
Electricity, when DC capacitor voltage is higher than dc circuit breaker bus bar side DC voltage, DC current begins to decline and is finally reduced to zero,
Realization is cut-off, and diode valve group is further changed to negative value to prevent DC capacitor and line after DC current being prevented to be reduced to zero
Road inductance forms inductor-capacitor oscillation.
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 for good and all isolated DC breaker to
Bus bar side DC voltage is prevented 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 may make whole device cost to substantially reduce.
As present invention further optimization, the DC capacitor two sides of the main branch are also parallel with discharge loop, to straight
It first discharges the DC capacitor before flowing breaker reclosing.
As present invention further optimization, the discharge loop is connected in series by mechanical switch and resistance.
As present invention further optimization, it is additionally parallel with DC capacitor in the line side of dc circuit breaker, with reliable
Judge whether DC Line Fault is removed, for reclosing.
As present invention further optimization, also coupled in series has resistance on the DC 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 electronic devices valve group being first turned off in the auxiliary branch, and
The mechanical switch on the auxiliary branch is opened afterwards.
As present invention further optimization, opens the mechanical switch on the auxiliary branch and be reduced to zero to DC current
Afterwards, the second mechanical switch of external series connection is opened.
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
Reclosing method after Fault Isolation, wherein this method be included in receive reclosing instruction after, first be closed auxiliary branch on
Mechanical switch, then open the power electronic devices valve group.
As present invention further optimization, before the mechanical switch on closure auxiliary branch, it is first closed external series connection
The mechanical switch connect.
It is another aspect of this invention to provide that provide it is a kind of can high-speed reclosure capacity-charging dc circuit breaker, be used for
After isolated DC failure, high-speed reclosure operation can be carried out without waiting for capacitor electric discharge, which is characterized in that the dc circuit breaker
It is formed in parallel by auxiliary branch and main branch, wherein
The auxiliary branch is connected in series by mechanical switch and power electronics valve group, DC current when using as normally
The branch flowed through；
The main branch includes the multiple groups tandem compound of parallel connection, wherein every group of tandem compound by the 4th mechanical switch and
DC capacitor connects to be formed, which is used to turn off auxiliary branch when needing to cut-off direct fault current and be transferred into
The branch road, and by DC capacitor voltage be higher than dc circuit breaker bus bar side DC voltage when DC current begin to decline simultaneously
Finally be reduced to zero and realize and cut-off, and be further changed to negative value after preventing DC current to be reduced to zero and prevent DC capacitor with
Line inductance forms inductor-capacitor oscillation, and can realize and carry out high-speed reclosure without waiting for capacitor electric discharge.
As present invention further optimization, when normally closed state, only one of them mechanical switch in each tandem compound
In closed state, and the mechanical switch in other tandem compounds is in and cut-offs state.
As present invention further optimization, it is parallel with discharge loop on the DC capacitor in each tandem compound, to this
It is first cut-off and concatenated 4th mechanical switch of the DC capacitor before DC capacitor electric discharge.
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 for good and all isolated DC breaker to
Bus bar side DC voltage is prevented 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 above scheme may make whole device cost to substantially reduce.
As present invention further optimization, it is additionally parallel with DC capacitor in the line side of dc circuit breaker, with reliable
Judge whether DC Line Fault is removed, for reclosing.
As present invention further optimization, also coupled in series has resistance on the DC capacitor of the additional parallel connection.
Preferably, the main branch further includes diode valve group, is connected with multiple groups tandem compound in parallel.
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, opens one of them described tandem compound
In be in closed state mechanical switch, realize direct fault current cut-off.
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 Failure elimination after reclosing method, wherein this method be included in receive reclosing instruction after, closure one
A the 4th mechanical switch for being initially in the state of cut-offfing, is then closed the first mechanical switch, then opens power electronic devices valve
Group realizes reclosing and fast quick-recovery 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 using DC capacitor and the concatenated scheme of diode valve group to
It is uniaxially charged to DC capacitor using direct fault current, eliminates existing inductor-capacitor resonance after cut-offfing DC Line Fault
Problem；
(2) the power electronics valve group of its auxiliary branch of dc circuit breaker of the invention uses fast power electronic device valve group
Power electronic devices valve group is connected in series to reduce the cost of power electronics valve group at a slow speed, greatly reduces main branch
Semiconductor cost；
(3) parallel combination of dc circuit breaker of the invention, multiple " mechanical switch-DC capacitor " substitutes single direct current
Capacitor is so that designed dc circuit breaker has high-speed reclosure ability, and system is restored after greatly improving DC Line Fault
The speed of power supply.
(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 made of DC capacitor.
Fig. 2 is a kind of embodiment of capacitor charging type dc circuit breaker.
Fig. 3 is main branch by connecting again with diode valve group after multiple four mechanical switch-capacitor tandem compounds parallel connections
Made of dc circuit breaker.
Fig. 4 is the dc circuit breaker in main branch comprising multiple four mechanical switch-DC capacitor tandem compounds.
Fig. 5 is in the additional parallel connection in the line side of the dc circuit breaker dc circuit breaker of DC capacitor.
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. 2 show the electrical block diagram of the capacitor charging type dc circuit breaker 1 of one embodiment of the invention.Figure
In 2, dc circuit breaker 1 is mainly formed in parallel by auxiliary branch 2 and main branch 3, and wherein auxiliary branch 2 is by the first mechanical switch 8
It is connected in series with power electronics valve group 9, main branch is connected in series by direct current capacitors 10 and diode valve group 11.
DC capacitor voltage rises too high in order to prevent, in a preferred embodiment, on auxiliary branch 2 and main branch 3
The third branch that can be made of with parallel connection arrester 5.
DC voltage, which is continuously applied, in order to prevent overheats arrester 5 because of leakage current on arrester 5, at one
In preferred embodiment, the outside for the shunt circuit that auxiliary branch 2, main branch 3 are constituted can also connect the second mechanical switch 6.Separately
In one embodiment, the second machine of external series for the shunt circuit that auxiliary branch 2, main branch 3 and third branch 5 are constituted
Tool switch 6.
In order to provide discharge path to DC capacitor 10, in a preferred embodiment, the both ends of DC capacitor 10 are also simultaneously
Discharge loop 4 is joined, discharge loop 4 is connected in series by third mechanical switch 12 and discharge resistance 13, mechanical by closure third
Switch 12 may make DC capacitor 10 to discharge by discharge paths 4.
In order to which during lowering DC Line Fault, the climbing speed of direct fault current assists branch in a preferred embodiment
It the outside for the shunt circuit that road 2, main branch 3 are constituted can also series direct current current-limiting inductance 7.In a further advantageous embodiment,
The external series direct current current-limiting inductance 7 for the shunt circuit that auxiliary branch 2, main branch 3 and third branch are constituted.
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 Fig. 2, in the embodiment shown in Figure 2, when normally closed state, the second mechanical switch 6, the first machine
Tool switch 8 and power electronics valve group 9 are in closed state, and third mechanical switch 4, which is in, cut-offs state.Cut-off DC Line Fault
When, it will be first turned off power electronics valve group 9, so that DC current is transferred in main branch 3, DC current will give DC capacitor 10
Charging, when the voltage of DC capacitor 10 is higher than bus bar side DC voltage 15, DC current will be begun to decline until being reduced to zero.
While turning off power electronics valve group 9 instruction cut-off, the first mechanical switch 8 can be issued to the first mechanical switch 8
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 8, the voltage of DC capacitor 10 is rising and the DC capacitor voltage is applied
It is added on auxiliary branch 2, the first mechanical switch 8 and power electronics valve group 9 on auxiliary branch 2 share DC capacitor electricity simultaneously
Pressure.
In one embodiment, power electronics valve group 9 is preferably gone here and there by all-controlling power electronics device 9a and thyristor 9b
Join.Wherein, all-controlling power electronics device 9a has self-switching-off capability and thyristor 9b only could in current over-zero
It is turned off.Cut-off signals will be applied to all-controlling power electronics device 9a and thyristor 9b simultaneously when turning off power electronics valve group 9,
All-controlling power electronics device 9a can be turned off very quickly after receiving cut-off signals, so that the electric current of auxiliary branch is reduced to
Zero, and then condition is provided for the shutdown of thyristor 9b, after 9a and 9b are turned off, 9a and 9b will share in series and be applied to electric power
Voltage in electronics valve group 9, since the voltage rating of thyristor 9b is usually above all-controlling power electronics device 9a and at low cost
In all-controlling power electronics device 9a, by using all-controlling power electronics device 9a and thyristor 9b power electronics in series
The method of valve group 9 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 electrically charged supreme
Voltage value needs first in order to enable dc circuit breaker completes that reclosing operation can be carried out after once cut-offfing operation to direct current
Hold 10 electric discharges, for this purpose, in one embodiment, it can be in the positive and negative electrode parallel discharge circuit 4 of DC capacitor 10.Discharge loop 4
It is connected in series by third mechanical switch 12 and resistance 13.The closure of third mechanical switch 12 can discharge to DC capacitor 10.
It is necessary to ensure that DC Line Fault has been removed before discharging to DC capacitor 10, criterion is detection dc circuit breaker line side
16 DC voltage, when the absolute value of the DC voltage in dc circuit breaker line side 16 be persistently higher than a certain lowest threshold (such as
2kV), then judge that DC Line Fault is removed.
The reclosing operation timing of dc circuit breaker shown in Fig. 2 are as follows: be first closed the first machinery after receiving reclosing instruction
Switch 8 then opens power electronics valve group 9.
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 16, when the DC voltage in dc circuit breaker line side 16
Absolute value be persistently higher than it is a certain be greater than zero threshold value (such as 2kV), then judge that DC Line Fault is removed.
Before reclosing, DC line 17 is generally light condition, in one embodiment, in order to prevent in direct current interruption
There is excessively high switching overvoltage in device line side 16, can be in 16 zinc oxide surge arresters 18 of dc circuit breaker line side.
As shown in figure 3, in another embodiment, in order to further enhance the efficiency of reclosing, making the delay to clamp on
Shorten, to accelerate the time to restore electricity, further optimization has been carried out to dc circuit breaker structure shown in Fig. 2.
Dc circuit breaker in Fig. 3, relative to scheme described in Fig. 2, contained in main branch 3 multiple groups DC capacitor and
Corresponding discharge paths and series connection mechanical switch.As shown in figure 3, comprising two DC capacitor 10a and 10b, the two of 10a and 10b
Parallel connection respectively discharge loop 4a and 4b are held, also connected mechanical switch 14a and 14b for the outside of DC capacitor 10a and 10b.Just
When normally on, only one group of DC capacitor comes into operation, for example, 14a closure is led back to access to DC capacitor 10a
Road, 14b, which is in, cut-offs state.
After dc circuit breaker is completed to cut-off direct fault current for the first time, DC capacitor 10a will be charged to high voltage,
Subsequent energy high-speed reclosure for convenience, when DC current is reduced to zero, mechanical switch 14a will be opened.
After dc circuit breaker receives reclosing instruction, it will successively be closed mechanical switch 14b, the first mechanical switch 8 and electricity
Power electronics valve group 9.After dc circuit breaker enters steady operational status, it will be closed mechanical switch 12a, to charged direct current
Capacitor 10a electric discharge, so that DC capacitor 10a can be used for next isolated DC fault 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 16, when the absolute value of the voltage value is higher than certain threshold value
(such as representative value 2kV) 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 16 of dc circuit breaker has foot after DC Line Fault is removed
Enough high residual voltages, the present invention provides a kind of sides in the additional branch in parallel containing DC capacitor in the line side of dc circuit breaker 16
Case, as shown in figure 5, being returned in the series connection that the additional parallel connection in the line side of dc circuit breaker 16 is made of DC capacitor 17 and resistance 18
Road.
In order to reduce the cost of dc circuit breaker, and dc circuit breaker is made to have high-speed reclosure ability, Fig. 4 gives
Except the direct-current breaker topology of diode valve group 11.Its structure is similar with Fig. 3, and difference is only that two poles deleted in main branch
Pipe valve group 11.
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
When being connected to negative polarity d. c route, need to turn the positive and negative polarity of dc circuit breaker 1, i.e., by 16 and negative DC bus phase
Connection, bus bar side 19 is connected with external dc transmission line of electricity.
Capacitor charging type dc circuit breaker provided by the invention can be used for cut-offfing direct fault current, and distinguishing feature is
Main branch uniaxially gives DC capacitor using direct fault current using DC capacitor and the concatenated scheme of diode valve group
Charging, eliminates existing inductor-capacitor resonance problems after cut-offfing DC Line Fault, in addition, the power electronics valve group of auxiliary branch
It is connected in series to reduce power electronics valve group using fast power electronic device valve group and at a slow speed power electronic devices valve group
Cost, and greatly reduce the semiconductor cost of main branch, moreover, the present invention further provides by multiple " mechanical switch-
The parallel combination of DC capacitor " substitutes single direct current capacitors so that designed dc circuit 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 (23)
1. a kind of capacitor charging type dc circuit breaker, which is characterized in that it includes auxiliary branch and main branch in parallel, wherein
The auxiliary branch is connected in series by mechanical switch and power electronic devices valve group, DC current when using as normally
The branch flowed through；
The main branch is connected in series by DC capacitor and diode valve group, and DC capacitor cathode connects with diode valve group anode
It connects, is used to that direct fault current to be transferred to the main branch by shutdown auxiliary branch when needing to cut-off direct fault current
On, and by beginning to decline DC current simultaneously when the DC capacitor voltage is higher than dc circuit breaker bus bar side DC voltage
Finally be reduced to zero and realize and cut-off, and be further changed to after preventing DC current to be reduced to zero by the diode valve group negative value from
And realizing prevents DC capacitor and line inductance from forming inductor-capacitor oscillation；
The DC capacitor two sides of the main branch are also parallel with discharge loop, to before dc circuit breaker reclosing first to the direct current
Discharge capacitor.
2. capacitor charging type dc circuit breaker according to claim 1, which is characterized in that wherein, the dc circuit breaker
Auxiliary branch and main branch on also in parallel third branch, the third branch route an arrester or connected by multiple arresters
Or it is formed in parallel.
3. capacitor charging type dc circuit breaker according to claim 1 or 2, which is characterized in that wherein, the direct current interruption
The outside for the shunt circuit that the main branch and auxiliary branch of device are constituted also has been connected direct current current-limiting inductance, to limit DC Line Fault
The climbing speed of electric current.
4. capacitor charging type dc circuit breaker according to claim 1 or 2, which is characterized in that wherein, the direct current interruption
The outside also coupled in series for the shunt circuit that the main branch and auxiliary branch of device are constituted has mechanical switch, for cut-offfing direct current
For good and all isolated DC breaker after stream.
5. capacitor charging type dc circuit breaker according to claim 1 or 2, which is characterized in that wherein, the auxiliary branch
Power electronic devices valve group by quick all-controlling power electronics device and slower speed thyristor or turn-off thyristor
It is connected in series.
6. capacitor charging type dc circuit breaker according to claim 1 or 2, which is characterized in that wherein, in dc circuit breaker
Line side be additionally parallel with DC capacitor, for judging whether DC Line Fault is removed, using as whether the condition of reclosing.
7. a kind of method for carrying out DC Line Fault isolation using the dc circuit breaker of any of claims 1-3, special
Sign is, wherein this method is included in when DC Line Fault occurs, the power electronic devices valve that is first turned off in the auxiliary branch
Group then opens the mechanical switch on the auxiliary branch.
8. a kind of method for carrying out DC Line Fault isolation using dc circuit breaker described in any one of claim 4-6, special
Sign is, wherein this method is included in when DC Line Fault occurs, the power electronic devices valve that is first turned off in the auxiliary branch
Group then opens the mechanical switch on the auxiliary branch, and after DC current is reduced to zero, opens the machine of external series connection
Tool switch.
It is carried out after DC Line Fault isolation using the dc circuit breaker of any of claims 1-3 and Failure elimination 9. a kind of
Reclosing method afterwards, which is characterized in that wherein, this method be included in receive reclosing instruction after, be first closed auxiliary branch
On mechanical switch, then open the power electronic devices valve group.
10. after a kind of progress DC Line Fault isolation using dc circuit breaker described in any one of claim 4-6 and failure disappears
Reclosing method after removing, which is characterized in that wherein, this method is included in receive reclosing instruction after, the first external string of closure
The mechanical switch of connection, then the mechanical switch being first closed on auxiliary branch, then open the power electronic devices valve group.
11. one kind can high-speed reclosure capacitor conversion type dc circuit breaker, for after isolated DC failure, without waiting for capacitor
Electric discharge can carry out high-speed reclosure operation, which is characterized in that and the dc circuit breaker is formed in parallel by auxiliary branch and main branch,
Wherein,
The auxiliary branch is connected in series by mechanical switch and power electronics valve group, and DC current flows through when using as normally
Branch；
The main branch includes the multiple groups tandem compound of parallel connection, wherein every group of tandem compound is by mechanical switch and DC capacitor
Series connection is formed, and the main branch further includes diode valve group, is connected with multiple groups tandem compound in parallel, which is used for
By shutdown auxiliary branch to which direct fault current to be transferred in the main branch when needing to cut-off direct fault current, and lead to
Crossing begins to decline DC current and most final decline when the DC capacitor voltage is higher than dc circuit breaker bus bar side DC voltage
It is zero and realizes and cut-off, and by is further changed to negative value after preventing DC current to be reduced to zero to prevent DC capacitor and route
Inductance forms inductor-capacitor oscillation, it can be achieved that being to carry out high-speed reclosure without waiting for capacitor electric discharge, in each tandem compound
Discharge loop is parallel on DC capacitor.
12. it is according to claim 11 can high-speed reclosure capacity-charging dc circuit breaker, which is characterized in that its
In, when normally state, only one of them mechanical switch is in closed state in each tandem compound, and in other tandem compounds
Mechanical switch be in cut-off state.
13. it is according to claim 11 or 12 can high-speed reclosure capacity-charging dc circuit breaker, which is characterized in that
Wherein, parallel connection third branch is gone back in the auxiliary branch of the dc circuit breaker and main branch, which routes one and take shelter from the thunder
Device is formed by multiple arrester serial or parallel connections.
14. it is according to claim 11 or 12 can high-speed reclosure capacity-charging dc circuit breaker, which is characterized in that
Wherein, the outside for the shunt circuit that the main branch of the dc circuit breaker and auxiliary branch are constituted also is in series with direct current current-limiting electricity
Sense, to limit the climbing speed of direct fault current.
15. it is according to claim 11 or 12 can high-speed reclosure capacity-charging dc circuit breaker, which is characterized in that
Wherein, the outside also coupled in series for the shunt circuit that the main branch of the dc circuit breaker and auxiliary branch are constituted has machinery
Switch is used for after breaking direct current for good and all isolated DC breaker.
16. it is according to claim 11 or 12 can high-speed reclosure capacity-charging dc circuit breaker, which is characterized in that
Wherein, the power electronic devices valve group of the auxiliary branch by quick all-controlling power electronics device and slower speed brilliant lock
Pipe or turn-off thyristor are connected in series.
17. it is according to claim 11 or 12 can high-speed reclosure capacity-charging dc circuit breaker, which is characterized in that
Wherein, it is additionally parallel with DC capacitor in the line side of dc circuit breaker, for judging whether DC Line Fault is removed, using as being
The condition of no reclosing.
18. it is a kind of using described in any one of claim 11-14 can high-speed reclosure dc circuit breaker carry out direct current therefore
Phragma from method, which is characterized in that wherein, this method be included in occur DC Line Fault when, be first turned off power electronic devices valve
Group, while instruction is cut-off to the mechanical switch sending on auxiliary branch, after DC current is reduced to zero, open described in one of them
It is in the mechanical switch of closed state in tandem compound, realizes that direct fault current is cut-off.
19. it is a kind of using described in any one of claim 15-17 can high-speed reclosure dc circuit breaker carry out direct current therefore
Phragma from method, which is characterized in that wherein, this method be included in occur DC Line Fault when, be first turned off power electronic devices valve
Group, while instruction is cut-off to the mechanical switch sending on auxiliary branch, after DC current is reduced to zero, open described in one of them
It is in the mechanical switch of closed state in tandem compound, and after DC current is reduced to zero, opens the machinery of external series connection
Switch realizes that direct fault current is cut-off.
20. it is a kind of using described in any one of claim 11-14 can high-speed reclosure dc circuit breaker carry out direct current therefore
Phragma is from the reclosing method after rear and Failure elimination, which is characterized in that wherein, this method, which is included in, receives reclosing instruction
Afterwards, it is closed a mechanical switch for being initially in the state of cut-offfing in tandem compound, the mechanical switch being then closed in auxiliary branch,
Power electronic devices valve group is then opened, realizes reclosing and fast quick-recovery direct current supply.
21. it is a kind of using described in any one of claim 15-17 can high-speed reclosure dc circuit breaker carry out direct current therefore
Phragma is from the reclosing method after rear and Failure elimination, which is characterized in that wherein, this method, which is included in, receives reclosing instruction
Afterwards, the mechanical switch that first closure external series couple, recloses a machinery for being initially in the state of cut-offfing in tandem compound and opens
It closes, the mechanical switch being then closed in auxiliary branch then opens power electronic devices valve group, realizes reclosing and fast quick-recovery
Direct current supply.
22. the method according to claim 20 or 21, which is characterized in that wherein, just sent out after DC Line Fault has been removed
Reclosing instructs out.
23. according to the method for claim 22, which is characterized in that wherein, pass through the straight of detection dc circuit breaker line side
Voltage value is flowed to judge whether DC Line Fault has been cleared by, when dc circuit breaker line side DC voltage is higher than certain threshold value
When, then judge that DC Line Fault has been cleared by.
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| CN112329235B (en) * | 2020-11-05 | 2023-03-28 | 上海远宽能源科技有限公司 | Power electronic system real-time simulation method based on hybrid modeling |
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| CN103117528B (en) * | 2013-01-17 | 2015-12-02 | 国网智能电网研究院 | One seals in capacitive high voltage DC circuit breaker and control method thereof |
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