CN110071475A - Reclosing method and reclosing device - Google Patents
Reclosing method and reclosing device Download PDFInfo
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- CN110071475A CN110071475A CN201910233284.1A CN201910233284A CN110071475A CN 110071475 A CN110071475 A CN 110071475A CN 201910233284 A CN201910233284 A CN 201910233284A CN 110071475 A CN110071475 A CN 110071475A
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- Prior art keywords
- faulty line
- reclosing
- line
- mechanical switch
- fault
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
- H02H3/06—Details with automatic reconnection
- H02H3/066—Reconnection being a consequence of eliminating the fault which caused disconnection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/268—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured for dc systems
-
- 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
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Direct Current Feeding And Distribution (AREA)
- Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
Abstract
The present invention provides a kind of reclosing method and reclosing devices, wherein after reclosing method includes: circuit breaker trip, judges whether faulty line meets with transient fault, if so, reclosing operation is carried out, if it is not, without reclosing operation.Reclosing method provided by the invention, judge whether faulty line meets with transient fault, it for non-transient failure (permanent fault) without closing operation, is blindly overlapped after avoiding circuit breaker trip, reclosing device provided by the invention also has same effect.
Description
Technical field
The present invention relates to technical field of direct current power transmission, it is particularly applied to the direct current transportation that receiving end is LCC-VSC hybrid type
The reclosing method and reclosing device of the breaker of system.
Background technique
Power distribution network is the important component of electric system, since its structure is complicated, widely distributed, dielectric level is not high,
In addition there are more defects in technical management and operation and maintenance, so that distribution line failure frequently occurs.Distribution line
Failure mainly has instantaneity and permanent fault two major classes type, wherein most failures are all instantaneity, in order to reduce line
Power supply reliability is improved, generallys use automatic weight in a power distribution system because of power outage caused by the reasons such as transient fault in road
Closing device.
Auto recloser plays important function in guaranteeing power system security power supply and stable operation, however,
Auto recloser in the prior art is blindly overlapped after circuit breaker trip, when it coincides with permanent event
When barrier, bigger harm is often caused to electric system and electrical equipment.
Therefore, how to avoid auto recloser from carrying out blindness coincidence after circuit breaker trip, guaranteeing for electrically continuous
Property while reduce breakdown loss be those skilled in the art's problem to be solved.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of reclosing method and reclosing devices, avoid circuit breaker trip
It is blindly overlapped afterwards.
In order to solve the above technical problems, the present invention provides a kind of reclosing method, for being carried out after circuit breaker trip
Reclosing operation, the breaker are installed on the DC transmission system that receiving end is LCC-VSC hybrid type, wherein
The receiving end includes a LCC converter station and multiple and institute for the receiving end of the DC transmission system of LCC-VSC hybrid type
State the VSC converter station of LCC converter station electrical connection；
The breaker include: multiple wiring points, with the one-to-one first line of the wiring point and the second route, one article the
Three routes and one article of the 4th route, wherein one of wiring point in the multiple wiring point is used for and the LCC change of current
It stands electrical connection, for remaining wiring point for being electrically connected with the VSC converter station, each described wiring point passes through described first respectively
Route and the second connection to the both ends of the tertiary circuit, the 4th lines in parallel in the both ends of the tertiary circuit,
Load current is connected in the first line when operating normally for DC transmission system, second route is described more for being isolated
Electric current and voltage between a wiring point, the tertiary circuit is used for disjunction fault current when DC transmission system failure, described
4th route is used for disjunction overvoltage when DC transmission system failure and absorbs the energy that inductive element stores, the first line
Including concatenated first Fast mechanical switch and the first electronic power switch, second route includes the concatenated second quick machine
Tool switch and diode, the cathode of the diode are connect with the tertiary circuit, and the tertiary circuit includes concatenated multiple
Second electronic power switch, the 4th route includes nonlinear resistance or arrester；
The trip method of the breaker includes the following steps:
A1: faulty line is determined；
A2: the first Fast mechanical switch corresponding with faulty line and corresponding with non-fault line second is opened quickly
Mechanical switch, meanwhile, it turns off first electronic power switch and opens second electronic power switch；
A3: to first Fast mechanical switch corresponding with faulty line and described corresponding with non-fault line
After the dynamic/static contact spacing of two Fast mechanical switch reaches predefined size, second electronic power switch is turned off；
A4: after fault current is absorbed by the 4th route, opening the second Fast mechanical switch corresponding with faulty line,
It is closed second Fast mechanical switch corresponding with non-fault line；
The reclosing method after the circuit breaker trip, judges whether faulty line meets with transient fault, if so, carrying out
Reclosing operation, if it is not, without reclosing operation.
Further, judge whether faulty line meets with transient fault, specifically comprise the following steps:
B1: after faulty line goes to dissociate, it is closed second Fast mechanical switch corresponding with faulty line；
B2: detection faulty line voltage；
B3: judge whether faulty line meets with transient fault according to faulty line voltage: if faulty line voltage rapid increase
To system dc voltage, faulty line meets with transient fault, if faulty line voltage maintains near 0, faulty line is met with
Non-transient failure.
Further, in the step B1, faulty line goes free method are as follows: so that described corresponding with faulty line
The second Fast mechanical switch be kept open first time period.
Further, reclosing operation are as follows: be closed first Fast mechanical switch corresponding with faulty line.
Further, it if faulty line meets with non-transient failure, sends a warning message.
The present invention also provides a kind of reclosing devices, described disconnected for carrying out reclosing operation after circuit breaker trip
Road device is installed on the DC transmission system that receiving end is LCC-VSC hybrid type, wherein
The receiving end includes a LCC converter station and multiple and institute for the receiving end of the DC transmission system of LCC-VSC hybrid type
State the VSC converter station of LCC converter station electrical connection；
The breaker include: multiple wiring points, with the one-to-one first line of the wiring point and the second route, one article the
Three routes and one article of the 4th route, wherein one of wiring point in the multiple wiring point is used for and the LCC change of current
It stands electrical connection, for remaining wiring point for being electrically connected with the VSC converter station, each described wiring point passes through described first respectively
Route and the second connection to the both ends of the tertiary circuit, the 4th lines in parallel in the both ends of the tertiary circuit,
Load current is connected in the first line when operating normally for DC transmission system, second route is described more for being isolated
Electric current and voltage between a wiring point, the tertiary circuit is used for disjunction fault current when DC transmission system failure, described
4th route is used for disjunction overvoltage when DC transmission system failure and absorbs the energy that inductive element stores, the first line
Including concatenated first Fast mechanical switch and the first electronic power switch, second route includes the concatenated second quick machine
Tool switch and diode, the cathode of the diode are connect with the tertiary circuit, and the tertiary circuit includes concatenated multiple
Second electronic power switch, the 4th route includes nonlinear resistance or arrester；
The trip method of the breaker includes the following steps:
A1: faulty line is determined；
A2: the first Fast mechanical switch corresponding with faulty line and corresponding with non-fault line second is opened quickly
Mechanical switch, meanwhile, it turns off first electronic power switch and opens second electronic power switch；
A3: to first Fast mechanical switch corresponding with faulty line and described corresponding with non-fault line
After the dynamic/static contact spacing of two Fast mechanical switch reaches predefined size, second electronic power switch is turned off；
A4: after fault current is absorbed by the 4th route, opening the second Fast mechanical switch corresponding with faulty line,
It is closed second Fast mechanical switch corresponding with non-fault line；
The reclosing device, comprising:
Breakdown judge unit, for judging whether faulty line meets with transient fault after the circuit breaker trip；
Reclosing operation unit, for carrying out reclosing operation when faulty line meets with transient fault, when faulty line meets with
Without reclosing operation when meeting non-transient failure.
Further, the breakdown judge unit includes:
First drive module, for after faulty line goes to dissociate, being closed the second quick machine corresponding with faulty line
Tool switch；
Detection module, for detecting faulty line voltage；
Judgment module, for judging whether faulty line meets with transient fault according to faulty line voltage: if faulty line is electric
Pressure rapidly increases to system dc voltage, and faulty line meets with transient fault, if faulty line voltage maintains near 0, therefore
Hinder route and meets with non-transient failure.
Further, in first drive module, faulty line goes free method are as follows: so that described and faulty line
Corresponding second Fast mechanical switch is kept open first time period.
Further, the reclosing operation unit, reclosing operation are as follows: closure described corresponding with faulty line the
One Fast mechanical switch.
Further, further include warning unit, for meeting with non-transient failure in faulty line, then give a warning letter
Breath.
Reclosing method provided by the invention, judges whether faulty line meets with transient fault, for non-transient event
Hinder (permanent fault) without closing operation, is blindly overlapped after avoiding circuit breaker trip, reclosing dress provided by the invention
It sets and also has same effect.
Detailed description of the invention
Fig. 1 is the structural schematic diagram for the DC transmission system that receiving end is LCC-VSC hybrid type；
Fig. 2 is the structural schematic diagram that breaker is installed on the DC transmission system that receiving end is LCC-VSC hybrid type；
Fig. 3 is the structural schematic diagram of breaker；
Fig. 4 is the schematic diagram of current flow paths when breaker is in the first operating mode；
Fig. 5 is the schematic diagram of current flow paths when breaker is in the second operating mode；
Fig. 6 is the timing diagram that breaker is switched to the second operating mode by the first operating mode；
Fig. 7, which is breaker, switches to the current flow paths after failure during the second operating mode occurs by the first operating mode
Schematic diagram；
Fig. 8, which is breaker, switches to electric current stream when fault current during the second operating mode is shifted by the first operating mode
The schematic diagram of path；
Fig. 9, which is breaker, is switched to current flowing during the second operating mode after tertiary circuit separating brake by the first operating mode
The schematic diagram in path；
Figure 10, which is breaker, is switched to the current flowing road during the second operating mode after Fault Isolation by the first operating mode
The schematic diagram of diameter；
Line voltage distribution Equivalent Circuit schematic diagram when Figure 11 is transient fault；
Line voltage distribution Equivalent Circuit schematic diagram when Figure 12 is permanent metal ground fault；
Line voltage distribution Equivalent Circuit schematic diagram when Figure 13 is permanent high resistance earthing fault.
Specific embodiment
The present invention will be further explained below with reference to the attached drawings and specific examples, so that those skilled in the art can be with
It more fully understands the present invention and can be practiced, but illustrated embodiment is not as a limitation of the invention.
Embodiment one:
Reclosing method provided by the invention is for carrying out reclosing operation after circuit breaker trip, and therefore, the present embodiment is first
Introduce breaker.
A kind of breaker, the breaker are installed on the DC transmission system that receiving end is LCC-VSC hybrid type, and receiving end is
The structure of the DC transmission system of LCC-VSC hybrid type is as shown in Figure 1, sending end uses LCC(Line Commutated
Converter, line commutation inverter), receiving end is changed using LCC and VSC(Voltage Source Converter, voltage source
Flow device) hybrid type DC transmission system.Receiving end is the receiving end of the DC transmission system of LCC-VSC hybrid type, such as Fig. 2 and Fig. 3
It is shown, comprising: a LCC converter station and multiple VSC converter stations being electrically connected with the LCC converter station, breaker includes: more
A wiring point 100, with 300, tertiary circuits 400 of the one-to-one first line 200 of wiring point 100 and the second route and
One article of the 4th route 500, wherein one of wiring point 100 in multiple wiring points 100 is used to be electrically connected with LCC converter station,
For remaining wiring point 100 for being electrically connected with VSC converter station, each wiring point 100 passes through first line 200 and the second line respectively
Road 300 is connected to the both ends of tertiary circuit 400, and the 4th route 500 is parallel to the both ends of tertiary circuit 300, and first line 200 is used
Load current is connected when DC transmission system operates normally, the second route 300 is used for the electricity being isolated between multiple wiring points 100
Stream and voltage, tertiary circuit 400 are used for disjunction fault current when DC transmission system failure, and the 4th route 500 is defeated for direct current
The energy of disjunction overvoltage and absorption inductive element storage when electric system failure.
Specifically, first line 200 includes concatenated first Fast mechanical switch and the first electronic power switch, and first is fast
The effect of fast mechanical switch is: when normal operation, guaranteeing that breaker operates in low-loss state；During failure on-off, first
Fast mechanical switch separating brake is to guarantee the foundation of drop-out voltage, so that fault current be forced to drop to zero.First power electronics is opened
The effect of pass is: when normal operation, load current is connected；During failure on-off, the first electronic power switch is turned off, forces electricity
Stream is transferred to tertiary circuit 400 from first line 200, to guarantee that non-arc breaking lock may be implemented in the first Fast mechanical switch.The
Two routes 300 include concatenated second Fast mechanical switch and diode, and the cathode of diode is connect with tertiary circuit 400, and two
The effect of pole pipe is: when hereinafter switching breaker to the second operating mode, not needing the on-off of control diode, letter
Change process, meanwhile, cost can be reduced using diode, in addition, the reverse blocking due to diode acts on, is sent out on the line
When raw failure, corresponding second route 300 of non-fault line will not stay fault current, tripping non-fault line corresponding second
It will not arcing when Fast mechanical switch.Tertiary circuit 400 includes concatenated multiple second electronic power switches, tertiary circuit 400
Realize the final shutdown to fault current.4th route 500 includes nonlinear resistance or arrester, for DC transmission system event
The energy of disjunction overvoltage and absorption inductive element storage when barrier.The movement speed of breaker depends primarily on the first Quick mechanical
Dielectric strength resume speed after switch and the second Fast mechanical switch separating brake, and the first electronic power switch and diode can be protected
It demonstrate,proves the first Fast mechanical switch and the second Fast mechanical switch and realizes non-arc breaking lock, so that it is guaranteed that the first Fast mechanical switch and the
Dielectric strength can fast quick-recovery after two Fast mechanical switch separating brakes.First electronic power switch and the second electronic power switch can be with
For insulated gate bipolar transistor.
The trip method of breaker is described below, for convenience of subsequent descriptions, each element of breaker is named: such as
Shown in Fig. 2 and 3, breaker includes:
M wiring point, respectively wiring point LCC, wiring point VSC_1, VSC_2 ..., VSC_m-1, wherein wiring point LCC with
Converter station LCC electrical connection, wiring point VSC_1, VSC_2 ..., VSC_m-1 respectively with converter station VSC1, VSC2 ...,
VSCm-1 electrical connection；
Respectively with the one-to-one first Fast mechanical switch CB_1, CB_2 of m wiring point ..., CB_m；
Respectively with the one-to-one first electronic power switch LSC_1, LSC_2 of m wiring point ..., LSC_m；
Respectively with the one-to-one second Fast mechanical switch K_1, K_2 of m wiring point ..., K_m；
Respectively with the one-to-one diode D_1, D_2 of m wiring point ..., D_m；
Tertiary circuit 400；
And the 4th route 500.
Assuming that line failure where wiring point VSC_1, trip method includes: when DC transmission system operates normally
When, keep breaker to be in the first operating mode；When line fault occurs for DC transmission system, by breaker by the first work
Pattern switching is to the second operating mode.When breaker is in the first operating mode, first Fast mechanical switch CB_1, CB_
2 ..., CB_m and second Fast mechanical switch K_1, K_2 ..., K_m be in closed state, the first electronic power switch
LSC_1, LSC_2 ..., LSC_m be on state, the second electronic power switch in tertiary circuit 400 be in locking
State, electric current can not be through-flow between each second route 300, and electric current is flowed by converter station LCC by each first line 200
Converter station VSC1, VSC2 ..., VSCm-1, current flow paths (line with the arrow in figure as shown in Figure 4 when the first operating mode
Segment table shows current path).Since the conduction voltage drop of first line 200 is usually 2 ~ 3V, the running wastage of breaker is only number kW.
When breaker is in the second operating mode, the first Fast mechanical switch corresponding with non-fault line and second is fastly
Fast mechanical switch is in closed state, and the first electronic power switch is on state, i.e. the first Fast mechanical switch CB_
1, CB_3 ..., CB_m and second Fast mechanical switch K_1, K_3 ..., K_m be in closed state, the first power electronics
Switch LSC_1, LSC_3 ..., LSC_m be on state, the second electronic power switch in tertiary circuit 400 is in
Blocking, the first Fast mechanical switch corresponding with faulty line and the second Fast mechanical switch are in disjunction state, i.e.,
First Fast mechanical switch CB_2 is in disjunction state, and the second Fast mechanical switch K_2 is in disjunction state, the second operating mode
Constantly current flow paths are (line segment expression current path with the arrow in figure) as shown in Figure 5.
Fig. 6 is the timing diagram that breaker is switched to the second operating mode by the first operating mode, in figure, when abscissa is
Between, ordinate is electric current, and Fig. 7 ~ 10 are that breaker is switched to electric current stream during the second operating mode by the first operating mode
The schematic diagram of path, the specific method for switching breaker to the second operating mode include the following steps:
At the t1 moment, failure occurs, after detecting failure, route where direct current protecting issues tripping wiring point VSC_1 to breaker
Order；
The t2 moment, dc circuit breaker controller first give the corresponding first Fast mechanical switch CB_2 of faulty line and with it is non-
The corresponding second Fast mechanical switch K_1, K_3 of faulty line ..., K_m hair cut-offs order, while giving tertiary circuit 400
In the second electronic power switch send out ON command, to the first electronic power switch LCS_2 send out locking order, the first electric power electricity
Under the action of the shutdown overvoltage at the both ends sub switch LCS_2, fault current will be shifted from the corresponding first line 200 of faulty line
To the second route 300 corresponding with faulty line of tertiary circuit 400, see that Fig. 8, electric current can shift completion in hundreds of microseconds, by
In the presence of contact inertia and contact over travel, Fast mechanical switch contact can be connected to cut-off order after 1ms just really separate, this
When electric current transfer be completed；
T3 moment, the first Fast mechanical switch CB_2 of faulty line and second Fast mechanical switch K_1, K_ of non-fault line
3 ..., K_m realizes non-arc breaking lock；
T4 moment, the first Fast mechanical switch CB_2 and second Fast mechanical switch K_1, K_3 ..., the dynamic/static contact of K_m away from
From predefined size is reached, locking order is sent to the second electronic power switch in tertiary circuit 400, gives the second Fast mechanical switch
K_2 sends separating brake order, and electric current is transferred to the 4th route 500 by tertiary circuit 400, sees Fig. 9, at this point, the first Quick mechanical is opened
Close CB_2 and second Fast mechanical switch K_1, K_3 ..., K_m need to undertake the residual voltage of the 4th route 500, generally 1.5
P.u, after the residual amount of energy of direct current system storage is almost absorbed by the 4th route 500, electric current will be transferred back to by the 4th route 500
In tertiary circuit 400 in the snubber circuit of second electronic power switch, so that aftercurrent is generated, due to the second quick machine
Tool switch K_1, K_3 ..., K_m it is already off, therefore in locking tertiary circuit 400 when second electronic power switch
Over-voltage will not be generated at diode both ends, reduces the requirement of diode；
At the t5 moment, the second Fast mechanical switch K_2 has realized separating brake, has cut-off the aftercurrent, gives the second Fast mechanical switch
K_1, K_3 ..., K_m send close a floodgate order so that system restore operate normally.
As shown in fig. 7, LCC converter station and remaining VSC converter station pass through the first electronic power switch after failure occurs
For LCS_2 to fault point feed-in fault current, fault current is only through-flow in each first line 200, current direction as shown in fig. 7,
After being connected to separating brake order, the first electronic power switch LCS_2 locking, fault current is shifted by the first electronic power switch LCS_2
To tertiary circuit 400, current direction is as shown in figure 8, disconnect tertiary circuit 400, fault current is isolated, and electric current is by third line
Road 400 is transferred to other wiring point, and current direction is as shown in figure 9, the second Fast mechanical switch K_2 separating brake, system are restored just
Often operation, the electric current for flowing through wiring point VSC_1 are distributed to remaining wiring point, and current direction is as shown in Figure 10.
When a plurality of DC line breaks down, cut-off sequence also according to above-mentioned, may be implemented faulty line every
From.
Reclosing method provided by the invention judges whether faulty line meets with instantaneity after the circuit breaker trip
Failure, if so, reclosing operation is carried out, if it is not, without reclosing operation.Judgement faulty line is not intended to limit in the present embodiment
Whether the specific method of transient fault is met with, as long as any method may determine that whether faulty line meets with transient fault
?.
In one optional embodiment of the present embodiment, judge whether faulty line meets with transient fault, specifically include as
Lower step:
B1: after faulty line goes to dissociate, it is closed second Fast mechanical switch corresponding with faulty line；
When transient fault occurs, breaker fast trip opens corresponding with faulty line second during tripping
Fast mechanical switch, at this moment DC voltage is added in the second Fast mechanical switch both ends corresponding with faulty line, fault point
Start to dissociate, if DC voltage is just going free period to be closed the second Fast mechanical switch corresponding with faulty line
It is added to fault point immediately, may result in fault point arcing again, therefore should be closed after fault point goes free and fault wire
Corresponding second Fast mechanical switch in road；
B2: detection faulty line voltage；
B3: judge whether faulty line meets with transient fault according to faulty line voltage: if faulty line voltage rapid increase
To system dc voltage, faulty line meets with transient fault, if faulty line voltage maintains near 0, faulty line is met with
Non-transient failure.
Theory analysis about the embodiment validity:
Direct current system voltage Equivalent Circuit is as shown in figure 11 when transient fault, and breaker is equivalent to uF grades of capacitor C1, failure
Point is equivalent to nF grades of capacitor C2, and according to circuit theory, the total voltage at capacitor seriesing circuit both ends is equal to each capacitor both ends point
The sum of pressure, the voltage and its capacitance that capacitor undertakes on each capacitor when connecting are inversely proportional (because in capacitor series circuit
In, the quantity of electric charge of institute's band is equal on each capacitor, so the voltage that the bigger capacitor of capacitance undertakes is lower, capacitance
The voltage that smaller capacitor undertakes is higher), therefore after closure the second Fast mechanical switch corresponding with faulty line, LCC
Converter station and VSC converter station are to this two equivalent capacity chargings, since breaker equivalent capacity is equivalent much larger than fault point
Capacitor, therefore breaker undertakes less voltage after charging electricity, most of voltage is undertaken by fault point.
Similarly, it when permanent metal ground fault occurs, after faulty line goes to dissociate, is closed opposite with faulty line
The second Fast mechanical switch answered, direct current system voltage Equivalent Circuit is as shown in figure 12, since fault point voltage is that 0, LCC is changed
Stream station and VSC converter station voltage are all undertaken by breaker, do not trigger the tertiary circuit 400 in breaker at this time, then fault point
It will not restrike.
When permanent high resistance earthing fault occurs, after faulty line goes to dissociate, it is closed corresponding with faulty line
Second Fast mechanical switch, direct current system voltage Equivalent Circuit is as shown in figure 13, since electric current is smaller in circuit, fault point electricity
It crimps nearly 0, LCC converter station and VSC converter station voltage all undertakes load by breaker, do not trigger the third line in breaker at this time
Road 400, then fault point will not restrike.
According to above-mentioned analysis, after faulty line goes to dissociate, it is closed the second Quick mechanical corresponding with faulty line and opens
It closes, measures faulty line voltage if faulty line voltage rapidly increases to system dc voltage and be judged to transient fault,
If faulty line voltage is maintained near 0, it is judged to permanent fault.
Above embodiment has the following beneficial effects:
This method is easy to operate by judging that line voltage distribution can reliably identify nature of trouble；
Reclosure time can be adaptively adjusted according to the voltage value at main circuit breaker both ends；
There is well adapting to property to permanent high resistance earthing fault；
Due to not turning on tertiary circuit 400 during reclosing, the overcurrent of tertiary circuit 400 not will cause.
In one optional embodiment of the present embodiment, in the step B1, faulty line goes free method are as follows: so that with
Corresponding second Fast mechanical switch of faulty line is kept open first time period, and first time period can be 200ms.
In one optional embodiment of the present embodiment, reclosing operation are as follows: closure described corresponding with faulty line the
One Fast mechanical switch.
In one optional embodiment of the present embodiment, if faulty line meets with non-transient failure, send a warning message,
Maintenance personal is notified to come to handle.
Embodiment two:
A kind of reclosing device is present embodiments provided, for carrying out reclosing operation after circuit breaker trip, wherein breaker
Structure and trip method as in the first embodiment, details are not described herein again.
The working principle of the present embodiment is the same as example 1, and can refer to embodiment one to understand.
Reclosing device, comprising:
Breakdown judge unit, for judging whether faulty line meets with transient fault after the circuit breaker trip；
Reclosing operation unit, for carrying out reclosing operation when faulty line meets with transient fault, when faulty line meets with
Without reclosing operation when meeting non-transient failure.
In one optional embodiment of the present embodiment, the breakdown judge unit includes:
First drive module, for after faulty line goes to dissociate, being closed the second quick machine corresponding with faulty line
Tool switch；
Detection module, for detecting faulty line voltage；
Judgment module, for judging whether faulty line meets with transient fault according to faulty line voltage: if faulty line is electric
Pressure rapidly increases to system dc voltage, and faulty line meets with transient fault, if faulty line voltage maintains near 0, therefore
Hinder route and meets with non-transient failure.
In one optional embodiment of the present embodiment, in first drive module, faulty line goes free method are as follows:
So that second Fast mechanical switch corresponding with faulty line is kept open first time period.
In one optional embodiment of the present embodiment, the reclosing operation unit, reclosing operation are as follows: closure it is described with
Corresponding first Fast mechanical switch of faulty line.
It further include warning unit in one optional embodiment of the present embodiment, for meeting with non-transient in faulty line
Failure is then sent a warning message.
The scope of protection of the present invention is not limited to this.Those skilled in the art are made equivalent on the basis of the present invention
Substitution or transformation, it is within the scope of the present invention.Protection scope of the present invention is subject to claims.
Claims (10)
1. a kind of reclosing method, for carrying out reclosing operation after circuit breaker trip, the breaker is installed on receiving end and is
The DC transmission system of LCC-VSC hybrid type, wherein
The receiving end includes a LCC converter station and multiple and institute for the receiving end of the DC transmission system of LCC-VSC hybrid type
State the VSC converter station of LCC converter station electrical connection；
The breaker include: multiple wiring points, with the one-to-one first line of the wiring point and the second route, one article the
Three routes and one article of the 4th route, wherein one of wiring point in the multiple wiring point is used for and the LCC change of current
It stands electrical connection, for remaining wiring point for being electrically connected with the VSC converter station, each described wiring point passes through described first respectively
Route and the second connection to the both ends of the tertiary circuit, the 4th lines in parallel in the both ends of the tertiary circuit,
Load current is connected in the first line when operating normally for DC transmission system, second route is described more for being isolated
Electric current and voltage between a wiring point, the tertiary circuit is used for disjunction fault current when DC transmission system failure, described
4th route is used for disjunction overvoltage when DC transmission system failure and absorbs the energy that inductive element stores, the first line
Including concatenated first Fast mechanical switch and the first electronic power switch, second route includes the concatenated second quick machine
Tool switch and diode, the cathode of the diode are connect with the tertiary circuit, and the tertiary circuit includes concatenated multiple
Second electronic power switch, the 4th route includes nonlinear resistance or arrester；
The trip method of the breaker includes the following steps:
A1: faulty line is determined；
A2: the first Fast mechanical switch corresponding with faulty line and corresponding with non-fault line second is opened quickly
Mechanical switch, meanwhile, it turns off first electronic power switch and opens second electronic power switch；
A3: to first Fast mechanical switch corresponding with faulty line and described corresponding with non-fault line
After the dynamic/static contact spacing of two Fast mechanical switch reaches predefined size, second electronic power switch is turned off；
A4: after fault current is absorbed by the 4th route, opening the second Fast mechanical switch corresponding with faulty line,
It is closed second Fast mechanical switch corresponding with non-fault line；
The reclosing method, which is characterized in that after the circuit breaker trip, judge whether faulty line meets with instantaneity event
Barrier, if so, reclosing operation is carried out, if it is not, without reclosing operation.
2. reclosing method as described in claim 1, which is characterized in that judge whether faulty line meets with transient fault,
Specifically comprise the following steps:
B1: after faulty line goes to dissociate, it is closed second Fast mechanical switch corresponding with faulty line；
B2: detection faulty line voltage；
B3: judge whether faulty line meets with transient fault according to faulty line voltage: if faulty line voltage rapid increase
To system dc voltage, faulty line meets with transient fault, if faulty line voltage maintains near 0, faulty line is met with
Non-transient failure.
3. reclosing method as claimed in claim 2, which is characterized in that in the step B1, faulty line goes to free side
Method are as follows: so that second Fast mechanical switch corresponding with faulty line is kept open first time period.
4. reclosing method as described in claim 1, which is characterized in that reclosing operation are as follows: be closed described and faulty line
Corresponding first Fast mechanical switch.
5. reclosing method as described in claim 1, which is characterized in that if faulty line meets with non-transient failure, send out
Warning message out.
6. a kind of reclosing device, for carrying out reclosing operation after circuit breaker trip, the breaker is installed on receiving end and is
The DC transmission system of LCC-VSC hybrid type, wherein
The receiving end includes a LCC converter station and multiple and institute for the receiving end of the DC transmission system of LCC-VSC hybrid type
State the VSC converter station of LCC converter station electrical connection；
The breaker include: multiple wiring points, with the one-to-one first line of the wiring point and the second route, one article the
Three routes and one article of the 4th route, wherein one of wiring point in the multiple wiring point is used for and the LCC change of current
It stands electrical connection, for remaining wiring point for being electrically connected with the VSC converter station, each described wiring point passes through described first respectively
Route and the second connection to the both ends of the tertiary circuit, the 4th lines in parallel in the both ends of the tertiary circuit,
Load current is connected in the first line when operating normally for DC transmission system, second route is described more for being isolated
Electric current and voltage between a wiring point, the tertiary circuit is used for disjunction fault current when DC transmission system failure, described
4th route is used for disjunction overvoltage when DC transmission system failure and absorbs the energy that inductive element stores, the first line
Including concatenated first Fast mechanical switch and the first electronic power switch, second route includes the concatenated second quick machine
Tool switch and diode, the cathode of the diode are connect with the tertiary circuit, and the tertiary circuit includes concatenated multiple
Second electronic power switch, the 4th route includes nonlinear resistance or arrester；
The trip method of the breaker includes the following steps:
A1: faulty line is determined；
A2: the first Fast mechanical switch corresponding with faulty line and corresponding with non-fault line second is opened quickly
Mechanical switch, meanwhile, it turns off first electronic power switch and opens second electronic power switch；
A3: to first Fast mechanical switch corresponding with faulty line and described corresponding with non-fault line
After the dynamic/static contact spacing of two Fast mechanical switch reaches predefined size, second electronic power switch is turned off；
A4: after fault current is absorbed by the 4th route, opening the second Fast mechanical switch corresponding with faulty line,
It is closed second Fast mechanical switch corresponding with non-fault line；
The reclosing device characterized by comprising
Breakdown judge unit, for judging whether faulty line meets with transient fault after the circuit breaker trip；
Reclosing operation unit, for carrying out reclosing operation when faulty line meets with transient fault, when faulty line meets with
Without reclosing operation when meeting non-transient failure.
7. reclosing device as claimed in claim 6, which is characterized in that the breakdown judge unit includes:
First drive module, for after faulty line goes to dissociate, being closed the second quick machine corresponding with faulty line
Tool switch；
Detection module, for detecting faulty line voltage；
Judgment module, for judging whether faulty line meets with transient fault according to faulty line voltage: if faulty line is electric
Pressure rapidly increases to system dc voltage, and faulty line meets with transient fault, if faulty line voltage maintains near 0, therefore
Hinder route and meets with non-transient failure.
8. reclosing device as claimed in claim 7, which is characterized in that in first drive module, faulty line goes to swim
From method are as follows: so that second Fast mechanical switch corresponding with faulty line is kept open first time period.
9. reclosing device as claimed in claim 6, which is characterized in that the reclosing operation unit, reclosing operation are as follows:
It is closed first Fast mechanical switch corresponding with faulty line.
10. reclosing device as claimed in claim 6, which is characterized in that further include warning unit, for meeting in faulty line
Non-transient failure is met, then is sent a warning message.
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| CN110071475B (en) | 2022-09-20 |
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