CN106684810A - Closed control method for judging DC circuit breaker fault capable of cascading and device thereof - Google Patents
Closed control method for judging DC circuit breaker fault capable of cascading and device thereof Download PDFInfo
- Publication number
- CN106684810A CN106684810A CN201710132498.0A CN201710132498A CN106684810A CN 106684810 A CN106684810 A CN 106684810A CN 201710132498 A CN201710132498 A CN 201710132498A CN 106684810 A CN106684810 A CN 106684810A
- Authority
- CN
- China
- Prior art keywords
- circuit breaker
- failure
- permanent fault
- branch road
- fault
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
- H02H3/05—Details with means for increasing reliability, e.g. redundancy arrangements
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
- H02H3/06—Details with automatic reconnection
- H02H3/066—Reconnection being a consequence of eliminating the fault which caused disconnection
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/268—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured for dc systems
Landscapes
- Emergency Protection Circuit Devices (AREA)
Abstract
The invention relates to a closed control method for judging DC circuit breaker fault capable of cascading and a device thereof. The method is described in the following: a permanent fault diagnosis is carried out when the DC circuit breaker is closed; when being judged as the permanent fault, the DC circuit breaker stops working in order to make sure the DC circuit is in a state of disconnection; The conditions for judging the permanent fault are: The current flowing through the DC circuit breaker exceeds the two over-current protection limit or too many sub-modules happens to overvoltage faults when shifting to branches. In sum, when being judged as the permanent fault, it is necessary to stop the operation of the closed circuit breaker in order to avoid a second failure which also means to avoid the damage of the devices in the circuit, which is beneficial to the stability of the system.
Description
Technical field
The present invention relates to cascade connection type mixed DC circuit breaker failure type identification closure control method and device.
Background technology
Technology of HVDC based Voltage Source Converter based on voltage source converter is due to its decoupled active and reactive independent control, Neng Goujie
Enter light current net, power to passive load, possessing that power grid"black-start" ability, dynamic response be fast, harmonic characterisitic is excellent and floor space
Little many advantages, such as, power in extensive intermittence new-energy grid-connected, the passive load of isolated island, AC network interconnection and city intelligent
Obtain increasingly being widely applied for aspects such as distribution.
There is direct-current short circuit failure in flexible DC power transmission, when especially aerial line is as DC line, direct current event
The probability that barrier occurs is relatively large.If not adopting an effective measure, the power breakdown of system can be caused, while causing power equipment
Overcurrent damage.In order to meet the reliability service of flexible direct current power transmission system, system needs to have DC Line Fault and passes through function.
At present industry has two kinds of DC Line Fault acrossing schemes, and a kind of scheme is the open circuit of semi-bridge type MMC inverters configuring direct current
Device, using dc circuit breaker direct-current short circuit electric current is cut-off；Another kind of scheme is that failure self-cleaning MMC inverters configure Quick mechanical
Switch, using failure self-cleaning MMC inverters fault current is removed.Flexible direct current electrical network this future thrust is directed to,
Dc circuit breaker scheme is bigger for the stability advantage of AC network, by the extensive concern of industry, therefore, ordinary circumstance
Under, it is to arrange dc circuit breaker in DC power transmission line to realize the isolation to failure.
As shown in figure 1, for the overall topological diagram of dc circuit breaker, including main branch, transfer branch road and power consumption branch road, main
String is provided with mechanical switch and several submodules on road, and string is provided with several submodules on transfer branch road, wherein, either main
Submodule on road still shifts the submodule on branch road, is generally full-bridge submodule, but is also not excluded for other tools
There is the submodule of said function, Fig. 1 Neutron modules are by taking full-bridge submodule as an example.Power consumption route spark gap etc. is constituted, for inhaling
Receive direct-current system short-circuit current.
When faulty generation is detected, such as when direct-current short circuit failure occurs, need to immediately cut-off faulty line both sides
Dc circuit breaker, this partly belongs to routine techniquess, just no longer illustrates here, and the process that chopper cut-offs is as follows：
Fig. 2-a to 2-d are the interrupting process schematic diagrams of the dc circuit breaker.As shown in Fig. 2-a, when normally running, transfer
Branch road is in locking blocking state, and ultrahigh speed mechanical switch closure in main branch, the submodule in main branch is in the conduction state,
Normal duty electric current Jing main branchs circulate；As shown in Fig. 2-b, when needing to disconnect dc circuit breaker when breaking down, branch road is shifted
On each submodule conducting, realize transfer branch road conducting, and locking shut-off main branch in submodule, realize the pass of main branch
Disconnected, fault current is from main branch to transfer branch road transfer；As shown in fig. 2-c, after the completion of electric current transfer, main branch electric current is reduced to
Zero, open mechanical switch；As shown in Fig. 2-d, after mechanical switch disconnects, the submodule in locking transfer branch road realizes transfer
The shut-off on road, and lightning arrestor movement absorbs short trouble energy, suppresses transient voltage, until short circuit current is reduced to zero, disjunction
Process terminates.
After dc circuit breaker disconnects, i.e., after the certain hour that failure occurs, need to carry out reclosing to chopper
Operation, current we carry out reclosing operation using following control process：
Fig. 3-a, to 3-c, and with reference to Fig. 2-a, 2-c and 2-d, are dc circuit breaker closing course schematic diagram.Such as Fig. 2-d institutes
Show, be the schematic diagram under chopper off state, main branch mechanical switch is disjunction state, the son in main branch and transfer branch road
Module is in locking off state；When dc circuit breaker needs closure, as shown in Fig. 3-a, the son in transfer branch road is opened
Module, will submodule conducting state is converted to by locking off state；When the submodule in shifting branch road is all opened, just
As shown in fig. 2-c；As shown in Fig. 3-b, after line current is stable, submodule in the main branch is in locking off state
Under, close mechanical switch；As shown in Fig. 3-c, the submodule in main branch is progressively opened；Afterwards progressively branch road is shifted in locking shut-off
In submodule, should during flow through the electric current of dc circuit breaker and be progressively transferred in main branch from transfer branch road, treat main branch
In submodule it is all open-minded, shift the submodule whole locking in branch road, flow through chopper electric current reach it is stable after, open circuit
Think highly of feed motion to complete, dc circuit breaker is in normal operating conditions after completing, and can be represented by Fig. 2-a.
Reasonable effectively fail-over policy, such as stability of the direct-current short circuit fail-over policy to flexible direct current system
Open pivotal role.But, it is above-mentioned to be easier to secondary failure occur when dc circuit breaker closure is carried out, it is unfavorable for system stability,
Easily cause the device damage in circuit.
The content of the invention
It is an object of the invention to provide a kind of cascade connection type mixed DC circuit breaker failure type identification closure control method, uses
To solve the problems, such as easily to occur secondary failure when dc circuit breaker is closed.Present invention simultaneously provides a kind of cascade connection type mixed DC
Circuit breaker failure type identification closes control device.
For achieving the above object, the solution of the present invention is closed including a kind of cascade connection type mixed DC circuit breaker failure type identification
Combination control method, comprises the following steps：
(1) when dc circuit breaker is closed, permanent fault judgement is carried out；
(2) when permanent fault is judged as, closure dc circuit breaker operation is stopped, it is ensured that dc circuit breaker is in disconnection
State；
The Rule of judgment of the permanent fault has：The electric current for flowing through dc circuit breaker exceedes the secondary overcurrent protection of setting
There is at least one submodule over-voltage fault occur in limit value, or transfer branch road；
It is described to cross maximum of the restriction value more than or equal to overhead transmission line charging current.
For both-end straight-flow system, after permanent fault is judged as first, the failure recovery time of setting is reserved, again
Dc circuit breaker reclosing operation set point number is attempted, if failure is still present, it is determined that for permanent fault.
For both-end straight-flow system, after because of permanent fault disconnecting dc circuit breaker, inverter switchs to STATCOM
Running status, for AC system reactive power support is provided.
When non-permanent failure is judged as, closure dc circuit breaker operation is continued to complete.
During transfer branch road is opened, each submodule on transfer branch road is progressively opened.
A kind of cascade connection type mixed DC circuit breaker failure type identification closes control device, including：
Judge module, for when dc circuit breaker is closed, carrying out permanent fault judgement；
Control module, for when permanent fault is judged as, stopping closure dc circuit breaker operation, it is ensured that direct current interruption
Device is off；
The Rule of judgment of the permanent fault has：The electric current for flowing through dc circuit breaker exceedes the secondary overcurrent protection of setting
There is at least one submodule over-voltage fault occur in limit value, or transfer branch road；
It is described to cross maximum of the restriction value more than or equal to overhead transmission line charging current.
For both-end straight-flow system, after permanent fault is judged as first, the failure recovery time of setting is reserved, again
Dc circuit breaker reclosing operation set point number is attempted, if failure is still present, it is determined that for permanent fault.
For both-end straight-flow system, after because of permanent fault disconnecting dc circuit breaker, inverter switchs to STATCOM
Running status, for AC system reactive power support is provided.
When non-permanent failure is judged as, closure dc circuit breaker operation is continued to complete.
During transfer branch road is opened, each submodule on transfer branch road is progressively opened.
In the dc circuit breaker closure control method that the present invention is provided, when dc circuit breaker is closed, especially in transfer
In submodule opening process in branch road, need to carry out species judgement to failure, see whether it is permanent fault, if forever
Long property failure, then if closure dc circuit breaker, may will result in secondary failure, be unfavorable for system stability, easily cause line
Device damage in road, so, when it is permanent fault to judge, it is necessary to stop closure dc circuit breaker operation, to protect
Card avoids the occurrence of secondary failure, will also avoid the equipment damaged in circuit, is conducive to system stability.
And, it has been found that if system line failure be permanent fault, then, when transfer branch road in locking
When the inverse electromotive force that the submodule of state is provided is not enough to support system DC voltage, the electric current for flowing through chopper just occurs
Beyond the phenomenon of limit value, i.e. over-current phenomenon avoidance, or there is the capacitance voltage of submodule beyond the phenomenon for setting over-pressed limit value, i.e. mistake
Pressure phenomenon of the failure；Therefore, by being analyzed to situation about being likely to occur, obtaining the judgment mode of permanent fault has：Flow through
The electric current of dc circuit breaker exceeds at least one submodule (particular number root in secondary overcurrent protection limit value, or transfer branch road
Set according to demand) there is over-voltage fault.As long as the two judgment modes occur a kind of it may determine that being out of order for permanent event
Barrier.Therefore, when permanent fault is judged, according to the state on the DC line that permanent fault occurs, reversely derive forever
The judgment mode of long property failure, so, this permanent fault judgment mode accurately can be judged permanent fault.
The dc circuit breaker closure control method be applied to all kinds of flexible direct current systems, determine permanent fault it
Afterwards, closure dc circuit breaker operation is stopped, it is ensured that chopper is off-state, to complete fault recovery.
Description of the drawings
Fig. 1 is a kind of topological diagram of dc circuit breaker；
Fig. 2-a are schematic diagrams when dc circuit breaker normally runs；
Fig. 2-b are the schematic diagrams when electric current in dc circuit breaker interrupting process is shifted；
Fig. 2-c are the schematic diagrams when transfer in dc circuit breaker interrupting process is completed；
Schematic diagram when Fig. 2-d are the switch off current in dc circuit breaker interrupting process；
Fig. 3-a are the schematic diagrams when submodule in dc circuit breaker transfer branch road is gradually opened；
Schematic diagram when Fig. 3-b are the closure mechanical switchs in dc circuit breaker opening process；
Fig. 3-c are the schematic diagrams when electric current in dc circuit breaker opening process is shifted；
Fig. 4 is both-end flexible direct current system schematic diagram；
Fig. 5 is four end flexible direct current network system schematic diagrams；
Fig. 6 is that DC Line Fault passes through schematic flow sheet；
Fig. 7 is the troubleshooting of both-end flexible direct current system and recovery policy schematic flow sheet；
Fig. 8 is the troubleshooting of flexible direct current network system and recovery policy schematic flow sheet.
Specific embodiment
Cascade connection type mixed DC circuit breaker failure type identification closure control method embodiment
The basic fundamental side of the cascade connection type mixed DC circuit breaker failure type identification closure control method that the present invention is provided
Case is comprised the following steps：
(1) when dc circuit breaker is closed, permanent fault judgement is carried out；
(2) when permanent fault is judged as, closure dc circuit breaker operation is stopped；
The judgment mode of permanent fault has：The electric current for flowing through dc circuit breaker exceedes the secondary overcurrent protection limit of setting
There is at least one submodule over-voltage fault occur in value, or transfer branch road.
Based on above basic technical scheme, it is further described in detail below in conjunction with the accompanying drawings.
Closure control method in the present embodiment possesses the widely suitability, such as：Both-end flexible direct current system, multiterminal are soft
Property straight-flow system, flexible direct current network system and Hybrid HVDC system etc..Both-end flexible direct current system is directed to individually below
The fault recovery method is specifically described with flexible direct current electrical network, Fig. 4 is the topology diagram of both-end flexible direct current system
(in figure, K1-K4 is mechanical type high-speed switch, and DCB1 and DCB2 is dc circuit breaker), Fig. 5 is four end flexible direct current electrical network systems
System, the i.e. topology diagram of flexible direct current electrical network.
For both-end flexible direct current system：
Both-end flexible direct current system can cut off faulty line after failure is sent, due to there was only a DC transmission line
Road, then transmit interrupt power.In addition, in multiterminal flexible direct current system during major power transmission line failure, system power
Transmission also will be forced to interrupt；Flexible direct current inverter portion in Hybrid HVDC system also can be with above-mentioned both-end flexible direct current
System is similar to, and transmits interrupt power after faulty line is cut off.
Fig. 6 gives the fault treating procedure of system dc short circuit, after system detectio to direct-current short circuit failure occurs, needs
The dc circuit breaker of faulty line both sides is cut-off at once.
For the interrupting process of dc circuit breaker, have been introduced in background technology, just no longer illustrate here.In addition,
After failure occurs, the inverter in both-end flexible direct current system can also be adjusted to STATCOM while chopper cut-offs
Running status, can provide reactive power support to AC system, the fast quick-recovery after being easy to failure to occur.
After confirming that faulty line both sides dc circuit breaker cut-offs, system needs the system reclosing that carry out again that waits for a period of time
Operation, i.e. dc circuit breaker closed procedure.This time includes two parts, is respectively direct-current arc arc extinguishing process and DC line
Go free process.DC line arc extinguishing, that is, dc circuit breaker suppresses the process of direct-current short circuit electric current, the process maintain when
Between it is related to the parameter such as dc circuit breaker, DC line, direct current reactor, bridge arm reactor, typically can control within 20ms；
DC line goes free process, is after arc extinction, to need a period of time by the conductive ion and electrons spread in former electric arc,
Air is cooled down, to avoid reclosing after the process that re-establishes of electric arc, direct current overhead transmission line goes the free time to be generally 150ms
To 500ms.
The dc circuit breaker of faulty line wherein one end is closed first, closing course operation is as described below：
Before closure, the off state of dc circuit breaker is as shown in Fig. 2-d, and main branch mechanical switch is disjunction state, main
Branch road is in blocking with full-bridge submodule in transfer branch road, that is, be off state.
The possible more than one of number of the full-bridge submodule in due to shifting branch road, therefore in the mistake of closure dc circuit breaker
Cheng Zhong, should progressively open first each full-bridge submodule in transfer branch road, full-bridge submodule is converted to by blocking open-minded
State, can be progressively open-minded, it is also possible to which all of full-bridge submodule is divided into into some groups, open-minded by group.
Each full-bridge submodule in transfer branch road progressively in opening process, needs to carry out permanent fault type judgement,
If there is permanent fault in circuit, then, the remaining full-bridge submodule offer in blocking is anti-in branch road is shifted
When being not enough to support system DC voltage to electromotive force, it may appear that the electric current for flowing through chopper exceedes the phenomenon of limit value, i.e. excessively stream
The capacitance voltage of the full-bridge submodule in phenomenon, or transfer branch road exceeds the phenomenon of the over-pressed limit value of setting, i.e. over-voltage fault
Phenomenon.In addition, the fault type of non-permanent failure can be referred to as transient fault, if system line failure is instantaneity event
Hinder, and line insulation has been restored, and when dc circuit breaker is opened, overhead transmission line charging electricity is flowed through on transfer branch road
Stream.
Therefore, in discriminating fault types, a secondary overcurrent protection limit value need to be set, the secondary overcurrent protection limit value is big
In or charging current equal to overhead transmission line maximum, the preferably protection limit value is larger than the charging current of overhead transmission line
Maximum.Overhead transmission line charging current is referred to：Due to there is stray capacitance in overhead transmission line, then, overhead transmission line charges
Electric current just refers to the charging current being charged to stray capacitance, and then, the maximum of the charging current of overhead transmission line is just referred to
The maximum charging current that stray capacitance is charged.In addition, if failure is recovered, i.e., system line failure is instantaneity event
Barrier, and line insulation is when being restored, when dc circuit breaker is closed, direct current network still can be to overhead transmission line stray electrical
Capacity charge, causes chopper to flow through overhead transmission line charging current.
So, in transfer branch road is progressively opened during full-bridge submodule, if uncertain line fault is recovered,
So, the full-bridge submodule electric capacity electricity under blocking in the electric current and transfer branch road of chopper is flow through in detection transfer branch road
Pressure, makes following judgement：If the electric current for flowing through dc circuit breaker exceedes above-mentioned secondary overcurrent protection limit value, or transfer branch road
In at least one full-bridge submodule occur over-voltage fault (in Rule of judgment, shift branch road in full-bridge submodule occur overvoltage
The number of failure is set according to actual requirement of engineering), then, decision-making system failure is permanent fault.Retouched according to above-mentioned
State and understand, the logical relation between above-mentioned two Rule of judgment is "or", as long as there is a condition to meet, it is possible to be judged as
Existing phenomenon of the failure.For both-end flexible direct current system, permanent fault can tentatively be judged according to above-mentioned Rule of judgment, when
So, if it is desired to further lift judgment accuracy, following operation can be carried out：After permanent fault is tentatively judged as, can
To reserve the longer system failure recovery time (recovery time can be set according to actual needs), reattempt to direct current and break
Closing operation set point number is thought highly of on road, and (the reclosing operation set point number can also be set according to actual needs, such as 2 times
Or more times), if phenomenon of the failure is still present, it is determined that for permanent fault.
If it is determined that permanent fault, then, it is necessary to fail-safe operation is carried out, the shut-off transfer branch road of locking immediately
Whole full-bridge submodules, stop closure dc circuit breaker operation, it is ensured that dc circuit breaker is off, it is ensured that equipment pacify
Complete and system safety.It is possible to further after confirming that dc circuit breaker disconnects, open the isolation knife of dc circuit breaker both sides
Lock, carries out faulty line service work, after the completion for the treatment of line maintenance work, by aforesaid operations system reclosing is re-started.
Certainly, if it is determined that not meeting above-mentioned Rule of judgment, then, the system failure it is determined that transient fault, and
Recovered system insulation.
If system failure detection failure is recovered for instantaneity, and system insulation, proceed closed procedure.So,
Full-bridge submodule in transfer branch road continue to it is progressively open-minded, until all open-minded, as shown in fig. 2-c.
After line current on branch road to be transferred is stablized, maintain the full-bridge submodule in main branch to be blocking, close
Mechanical switch, as shown in Fig. 3-b.
As shown in Fig. 3-c, the full-bridge submodule in main branch is progressively opened, until the full-bridge submodule whole in main branch
It is open-minded.
As shown in Fig. 2-a, after the line current in main branch is stable, full-bridge submodule in branch road is shifted in progressively locking shut-off
Block, during being somebody's turn to do, the electric current in dc circuit breaker is progressively transferred in main branch from transfer branch road.Branch road full-bridge submodule to be transferred
Block whole locking shut-off, and flow through dc circuit breaker electric current reach it is stable after, faulty line one side chopper reclosing is moved
Complete.
Then, reclosing operation is carried out to the dc circuit breaker of faulty line opposite side, it is flexible straight to complete whole both-end
The fault recovery control of streaming system.Opposite side dc circuit breaker during reclosing, already without considering permanent fault
May, can disposably turn on the full-bridge submodule on transfer branch road.
For both-end flexible direct current system, then the control model for changing inverter is needed, work(is switched to by STATCOM operational modes
Rate transmission mode.
Fig. 7 provides the whole flow process of system failure process and the recovery of dc circuit breaker in both-end flexible direct current system and shows
It is intended to.Certainly, this is a kind of specific embodiment, and the dc circuit breaker closure control method that the present invention is provided does not limit to
In this.
For flexible direct current network system, below by taking four end flexible direct current network systems as an example：
After the generation of direct-current short circuit failure is detected, need to judge whether inverter occurs bridge arm over current fault, if the change of current
Standing bridge arm over current fault of do not occur, then maintain normal operation control, after the excision of pending fault circuit, system passes through other loop transfers
Power, maintains normal operation；If part inverter occur bridge arm excessively stream, inverter should locking immediately, dc circuit breaker to be confirmed
After the completion of action, unblock again is resumed operation.No matter whether inverter there is bridge arm over current fault, as long as detecting direct-current short circuit
Failure, just cut-offs at once the dc circuit breaker of faulty line both sides.
After confirming that faulty line both sides dc circuit breaker cut-offs, system needs to wait direct-current arc arc extinguishing process and AC line
Road goes free process to carry out system reclosing operation again.
The dc circuit breaker of faulty line wherein one end is closed first, closing course operation is as described below：
Identical with above-mentioned both-end straight-flow system, before closure, the off state of dc circuit breaker is main to prop up as shown in Fig. 2-d
Road mechanical switch is disjunction state, and main branch is in blocking, that is, is off shape with full-bridge submodule in transfer branch road
State.
During closure dc circuit breaker, each full-bridge submodule in transfer branch road should be progressively opened first, will
Full-bridge submodule is converted to opening state by blocking.
Full-bridge submodule in transfer branch road progressively in opening process, needs to carry out permanent fault type judgement, if
There is permanent fault in circuit, then, the remaining full-bridge submodule offer in blocking is reverse in branch road is shifted
When electromotive force is not enough to support system DC voltage, it may appear that flow through the phenomenon of the electric current more than limit value of chopper, i.e. excessively stream and show
As, or transfer branch road in full-bridge submodule capacitance voltage beyond setting over-pressed limit value phenomenon, i.e., over-voltage fault show
As.In addition, the fault type of non-permanent failure can be referred to as transient fault, if system line failure is transient fault,
And line insulation has been restored, when dc circuit breaker is opened, on transfer branch road overhead transmission line charging current is flowed through.
Therefore, in discriminating fault types, a secondary overcurrent protection limit value need to be set, the secondary overcurrent protection limit value is big
In or charging current equal to overhead transmission line maximum, the preferably protection limit value is larger than the charging current of overhead transmission line
Maximum.
So, in transfer branch road is progressively opened during full-bridge submodule, in detection transfer branch road chopper is flow through
Electric current and transfer branch road in full-bridge submodule capacitor voltage under blocking, make following judgement：If flowing through direct current to break
The electric current of road device exceedes at least one full-bridge submodule in above-mentioned secondary overcurrent protection limit value, or transfer branch road and overvoltage occurs
(in Rule of judgment, the number that over-voltage fault occurs in the full-bridge submodule in transfer branch road is carried out failure according to actual requirement of engineering
Setting), then, decision-making system failure is permanent fault.
Logical relation between above-mentioned two Rule of judgment is "or", as long as there is a condition to meet, it is possible to be judged as
Permanent fault.If it is determined that permanent fault, then, it is necessary to fail-safe operation is carried out, the shut-off transfer of locking immediately
Whole full-bridge submodules of branch road, stop closure dc circuit breaker operation, it is ensured that dc circuit breaker is off, it is ensured that set
Standby safety and system safety.It is possible to further after confirming that dc circuit breaker disconnects, open dc circuit breaker both sides every
From disconnecting link, faulty line service work is carried out, after the completion for the treatment of line maintenance work, re-start system by aforesaid operations and overlap
Lock.
Certainly, if not meeting above-mentioned Rule of judgment, then, the system failure is it is determined that transient fault and extensive
Complex system insulate.
If system failure detection failure is recovered for instantaneity, and system insulation, proceed closed procedure.So,
Full-bridge submodule in transfer branch road continue to it is progressively open-minded, until all open-minded, as shown in fig. 2-c.
After line current on branch road to be transferred is stablized, maintain the full-bridge submodule in main branch to be blocking, close
Mechanical switch, as shown in Fig. 3-b.
As shown in Fig. 3-c, the full-bridge submodule in main branch is progressively opened, until the full-bridge submodule whole in main branch
It is open-minded.
As shown in Fig. 2-a, after the line current in main branch is stable, full-bridge submodule in branch road is shifted in progressively locking shut-off
Block, during being somebody's turn to do, the electric current in dc circuit breaker is progressively transferred in main branch from transfer branch road.Branch road full-bridge submodule to be transferred
Block whole locking shut-off, and flow through dc circuit breaker electric current reach it is stable after, faulty line one side chopper reclosing is moved
Complete.
Then, identical reclosing operation is carried out to the dc circuit breaker of faulty line opposite side, to complete whole both-end
The fault recovery control of flexible direct current system.Opposite side dc circuit breaker is permanent already without to consider during reclosing
Property failure may, can disposably turn on transfer branch road on full-bridge submodule.
Fig. 8 provides the whole stream that the system failure of dc circuit breaker in four end flexible direct current network systems is processed and recovered
Journey schematic diagram.Certainly, this is a kind of specific embodiment, and the dc circuit breaker closure control method that the present invention is provided is not
It is confined to this.
Cascade connection type mixed DC circuit breaker failure type identification closes control device embodiment
In the present embodiment, the device includes two modules, is respectively judge module and control module, wherein, judge module,
For when dc circuit breaker is closed, carrying out permanent fault judgement.
Control module, for when permanent fault is judged as, stopping closure dc circuit breaker operation, it is ensured that direct current interruption
Device is off.
The two modules are software module, and by loading corresponding function is realized in the controls, so, the two moulds
Block is substantially two steps of dc circuit breaker closure control method, therefore the device is substantially still that dc circuit breaker is closed
Combination control method, due to being explained to the method in said method embodiment, just repeats no more here.
Specific embodiment is presented above, but the present invention is not limited to described embodiment.The base of the present invention
This thinking is the type of failure judgement in the above-mentioned submodule opening process on transfer branch road, if permanent fault,
Then stop closure dc circuit breaker, it is ensured that dc circuit breaker is off-state.And for other parts, such as when failure occurs,
Dc circuit breaker disconnects, and other process belongs to prior art, and nor the inventive point of the present invention, therefore,
Change, modification, replacement and the modification carried out to embodiment in the case of above-mentioned basic ideas without departing from the present invention still falls within
In protection scope of the present invention.
Claims (10)
1. a kind of cascade connection type mixed DC circuit breaker failure type identification closure control method, it is characterised in that including following step
Suddenly：
(1) when dc circuit breaker is closed, permanent fault judgement is carried out；
(2) when permanent fault is judged as, closure dc circuit breaker operation is stopped, it is ensured that dc circuit breaker is in disconnection shape
State；
The Rule of judgment of the permanent fault has：The electric current for flowing through dc circuit breaker exceedes the secondary overcurrent protection limit of setting
There is at least one submodule over-voltage fault occur in value, or transfer branch road；
It is described to cross maximum of the restriction value more than or equal to overhead transmission line charging current.
2. cascade connection type mixed DC circuit breaker failure type identification closure control method according to claim 1, its feature
It is, for both-end straight-flow system, after permanent fault is judged as first, to reserve the failure recovery time of setting, tastes again
Examination dc circuit breaker reclosing operation set point number, if failure is still present, it is determined that for permanent fault.
3. cascade connection type mixed DC circuit breaker failure type identification closure control method according to claim 1, its feature
It is that, for both-end straight-flow system, after because of permanent fault disconnecting dc circuit breaker, inverter switchs to STATCOM fortune
Row state, for AC system reactive power support is provided.
4. the cascade connection type mixed DC circuit breaker failure type identification according to claim 1-3 any one closes controlling party
Method, it is characterised in that when non-permanent failure is judged as, continues to complete closure dc circuit breaker operation.
5. cascade connection type mixed DC circuit breaker failure type identification closure control method according to claim 1, its feature
It is during transfer branch road is opened, progressively to open each submodule on transfer branch road.
6. a kind of cascade connection type mixed DC circuit breaker failure type identification closes control device, it is characterised in that include：
Judge module, for when dc circuit breaker is closed, carrying out permanent fault judgement；
Control module, for when permanent fault is judged as, stopping closure dc circuit breaker operation, it is ensured that at dc circuit breaker
In off-state；
The Rule of judgment of the permanent fault has：The electric current for flowing through dc circuit breaker exceedes the secondary overcurrent protection limit of setting
There is at least one submodule over-voltage fault occur in value, or transfer branch road；
It is described to cross maximum of the restriction value more than or equal to overhead transmission line charging current.
7. cascade connection type mixed DC circuit breaker failure type identification according to claim 6 closes control device, its feature
It is, for both-end straight-flow system, after permanent fault is judged as first, to reserve the failure recovery time of setting, tastes again
Examination dc circuit breaker reclosing operation set point number, if failure is still present, it is determined that for permanent fault.
8. cascade connection type mixed DC circuit breaker failure type identification according to claim 6 closes control device, its feature
It is that, for both-end straight-flow system, after because of permanent fault disconnecting dc circuit breaker, inverter switchs to STATCOM fortune
Row state, for AC system reactive power support is provided.
9. the cascade connection type mixed DC circuit breaker failure type identification closure control according to claim 6-8 any one is filled
Put, it is characterised in that when non-permanent failure is judged as, continue to complete closure dc circuit breaker operation.
10. cascade connection type mixed DC circuit breaker failure type identification according to claim 6 closes control device, its feature
It is during transfer branch road is opened, progressively to open each submodule on transfer branch road.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710132498.0A CN106684810B (en) | 2017-03-07 | 2017-03-07 | Cascade connection type mixed DC circuit breaker failure type identification closure control method and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710132498.0A CN106684810B (en) | 2017-03-07 | 2017-03-07 | Cascade connection type mixed DC circuit breaker failure type identification closure control method and device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106684810A true CN106684810A (en) | 2017-05-17 |
| CN106684810B CN106684810B (en) | 2019-02-01 |
Family
ID=58828578
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710132498.0A Active CN106684810B (en) | 2017-03-07 | 2017-03-07 | Cascade connection type mixed DC circuit breaker failure type identification closure control method and device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106684810B (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107482575A (en) * | 2017-08-01 | 2017-12-15 | 全球能源互联网研究院 | A kind of failure of high voltage DC breaker is from process control method and system |
| CN107565506A (en) * | 2017-08-21 | 2018-01-09 | 全球能源互联网研究院有限公司 | A kind of dc circuit breaker reclosing control method and device |
| CN107656196A (en) * | 2017-08-16 | 2018-02-02 | 全球能源互联网研究院有限公司 | A kind of dc circuit breaker routine testing equipment |
| CN110011282A (en) * | 2019-01-24 | 2019-07-12 | 华中科技大学 | A kind of direct-current short circuit Judgement of failure method and direct current system reclosing method |
| CN110581042A (en) * | 2019-09-05 | 2019-12-17 | 山东泰开电力开关有限公司 | Novel arc extinguishing grid plate type load switch suitable for C4F7N environment-friendly gas |
| CN110649582A (en) * | 2019-10-30 | 2020-01-03 | 四川大学 | Direct current breaker configuration method based on converter station node type |
| CN110718929A (en) * | 2019-09-02 | 2020-01-21 | 中国科学院电工研究所 | Current conversion module, energy storage power station structure, energy storage power station system and fault processing method |
| CN110850237A (en) * | 2019-12-03 | 2020-02-28 | 西安交通大学 | Direct current single-end-quantity fault positioning system and method based on active detection |
| CN114035497A (en) * | 2021-10-26 | 2022-02-11 | 江西五十铃汽车有限公司 | Emergency switching control method suitable for finish paint drying furnace of automobile coating plant |
| WO2024087164A1 (en) * | 2022-10-28 | 2024-05-02 | 宁德时代未来能源(上海)研究院有限公司 | Overcurrent protection method and system for energy storage valve, computer device, and storage medium |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102810911A (en) * | 2012-08-08 | 2012-12-05 | 深圳供电局有限公司 | Power line reclosing action method and system based on communication |
| CN106301307A (en) * | 2016-10-13 | 2017-01-04 | 全球能源互联网研究院 | A kind of New Cascading full-bridge high voltage DC breaker and control method thereof |
| CN106300297A (en) * | 2016-09-08 | 2017-01-04 | 天津大学 | Multiterminal flexible direct current electrical network one pole ground connection self adaptation reclosing method |
| CN107359588A (en) * | 2016-09-22 | 2017-11-17 | 天津大学 | The very adaptive reclosing method of bipolar MMC HVDC transmission system monopolar grounding faults |
-
2017
- 2017-03-07 CN CN201710132498.0A patent/CN106684810B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102810911A (en) * | 2012-08-08 | 2012-12-05 | 深圳供电局有限公司 | Power line reclosing action method and system based on communication |
| CN106300297A (en) * | 2016-09-08 | 2017-01-04 | 天津大学 | Multiterminal flexible direct current electrical network one pole ground connection self adaptation reclosing method |
| CN107359588A (en) * | 2016-09-22 | 2017-11-17 | 天津大学 | The very adaptive reclosing method of bipolar MMC HVDC transmission system monopolar grounding faults |
| CN106301307A (en) * | 2016-10-13 | 2017-01-04 | 全球能源互联网研究院 | A kind of New Cascading full-bridge high voltage DC breaker and control method thereof |
Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107482575A (en) * | 2017-08-01 | 2017-12-15 | 全球能源互联网研究院 | A kind of failure of high voltage DC breaker is from process control method and system |
| CN107482575B (en) * | 2017-08-01 | 2020-01-24 | 全球能源互联网研究院 | Fault self-processing control method and system for high-voltage direct-current circuit breaker |
| CN107656196A (en) * | 2017-08-16 | 2018-02-02 | 全球能源互联网研究院有限公司 | A kind of dc circuit breaker routine testing equipment |
| CN107656196B (en) * | 2017-08-16 | 2023-09-19 | 全球能源互联网研究院有限公司 | Routine test equipment for direct current breaker |
| CN107565506A (en) * | 2017-08-21 | 2018-01-09 | 全球能源互联网研究院有限公司 | A kind of dc circuit breaker reclosing control method and device |
| WO2019037728A1 (en) * | 2017-08-21 | 2019-02-28 | 全球能源互联网研究院有限公司 | Reclosing controlling method and apparatus for direct-current circuit breaker, and storage medium |
| CN110011282A (en) * | 2019-01-24 | 2019-07-12 | 华中科技大学 | A kind of direct-current short circuit Judgement of failure method and direct current system reclosing method |
| CN110011282B (en) * | 2019-01-24 | 2020-01-21 | 华中科技大学 | Method for judging nature of direct-current short-circuit fault and reclosing method of direct-current system |
| CN110718929A (en) * | 2019-09-02 | 2020-01-21 | 中国科学院电工研究所 | Current conversion module, energy storage power station structure, energy storage power station system and fault processing method |
| CN110581042A (en) * | 2019-09-05 | 2019-12-17 | 山东泰开电力开关有限公司 | Novel arc extinguishing grid plate type load switch suitable for C4F7N environment-friendly gas |
| CN110581042B (en) * | 2019-09-05 | 2024-04-09 | 山东泰开电力开关有限公司 | Novel arc extinguishing grid piece formula load switch suitable for C4F7N environmental protection gas |
| CN110649582A (en) * | 2019-10-30 | 2020-01-03 | 四川大学 | Direct current breaker configuration method based on converter station node type |
| CN110649582B (en) * | 2019-10-30 | 2020-11-10 | 四川大学 | Direct current breaker configuration method based on converter station node type |
| CN110850237A (en) * | 2019-12-03 | 2020-02-28 | 西安交通大学 | Direct current single-end-quantity fault positioning system and method based on active detection |
| CN110850237B (en) * | 2019-12-03 | 2020-10-27 | 西安交通大学 | Direct current single-end-quantity fault positioning system and method based on active detection |
| CN114035497A (en) * | 2021-10-26 | 2022-02-11 | 江西五十铃汽车有限公司 | Emergency switching control method suitable for finish paint drying furnace of automobile coating plant |
| WO2024087164A1 (en) * | 2022-10-28 | 2024-05-02 | 宁德时代未来能源(上海)研究院有限公司 | Overcurrent protection method and system for energy storage valve, computer device, and storage medium |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106684810B (en) | 2019-02-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106684810A (en) | Closed control method for judging DC circuit breaker fault capable of cascading and device thereof | |
| CN104242265B (en) | All-solid-state direct-current circuit breaker of direct-current power distribution network | |
| EP2856590B1 (en) | Method of fault clearance | |
| CN110970875A (en) | Combined current-limiting type direct current breaker for direct current power grid | |
| CN106936120B (en) | A kind of DC grid line fault protection method | |
| CN102055368A (en) | 100-KVA micro-grid energy storage bidirectional converter | |
| KR20180103181A (en) | DC current interrupter and control method | |
| CN109659967A (en) | Converter station containing resistive superconducting current limiter and dc circuit breaker and its DC Line Fault processing strategie | |
| CN111357162B (en) | Fault handling in a DC power system | |
| CN105977954B (en) | A kind of breaker mixed configuration method and device of flexible direct current power grid | |
| CN106026048A (en) | DC grid fault handling strategy based on in-situ detection and in -situ protection | |
| CN106532661B (en) | A kind of separating brake control method of high voltage DC breaker | |
| CN106026137B (en) | A kind of alternating current circuit fault traversing control method of THE UPFC | |
| CN113826302A (en) | Protection device and protection method of photovoltaic power generation system and photovoltaic power generation system | |
| CN109787206A (en) | A kind of capacitance-resistance type current-limiting type direct-current breaker topology suitable for multiterminal element and DC grid | |
| CN101297455B (en) | A converter station | |
| CN106532757A (en) | Bipolar flexible direct current transmission system, converter station thereof and control method of converter station | |
| CN109450080A (en) | A kind of automatic redundancy zero propagation switching system of two dc power supply and method | |
| CN106532756A (en) | DC fault ride-through method for flexible DC power grid | |
| CN203722250U (en) | Photovoltaic device | |
| CN109361197A (en) | A kind of overcurrent protective device and method | |
| CN209170039U (en) | A kind of automatic redundancy zero propagation switching system of two dc power supply | |
| CN108011389A (en) | A kind of compound direct current transmission facility | |
| CN107565521B (en) | Method for clearing short-circuit fault on direct current side of flexible direct current power grid | |
| CN206211547U (en) | Bipolar flexible direct current transmission system and converter station thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |