CN104900444B - The topological structure and its control method of dc circuit breaker - Google Patents
The topological structure and its control method of dc circuit breaker Download PDFInfo
- Publication number
- CN104900444B CN104900444B CN201510363533.0A CN201510363533A CN104900444B CN 104900444 B CN104900444 B CN 104900444B CN 201510363533 A CN201510363533 A CN 201510363533A CN 104900444 B CN104900444 B CN 104900444B
- Authority
- CN
- China
- Prior art keywords
- current
- current path
- circuit breaker
- turned
- mechanical switch
- 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.)
- Expired - Fee Related
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
- H01H33/02—Details
- H01H33/59—Circuit arrangements not adapted to a particular application of the switch and not otherwise provided for, e.g. for ensuring operation of the switch at a predetermined point in the ac cycle
- H01H33/596—Circuit arrangements not adapted to a particular application of the switch and not otherwise provided for, e.g. for ensuring operation of the switch at a predetermined point in the ac cycle for interrupting dc
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
Abstract
The invention discloses a kind of topological structure for the dc circuit breaker for belonging to electric and electronic technical field and its control method, dc circuit breaker is T-shape bidirectionally symmetric structure, is made up of the first current path, the second current path and the 3rd current path.The leading-out terminal a of first current path is connected with direct current transmission and distribution system equivalent inductance L9 one end, the middle leading-out terminal b of first current path is connected with one end after the second current path and the 3rd current conduction path in parallel, and the leading-out terminal c of the first current path is defeated with direct current, distribution line is connected；Other end ground connection after second current path and the 3rd current conduction path in parallel；The present invention can effectively solve the problems, such as direct current arc extinguishing, flexible structure, and autgmentability is strong, meet the through-flow, cutout under defeated direct current, the different voltages of power distribution network, current class, pressure-resistant, loss and energy absorption etc. and require, and can significantly reduce equipment cost.
Description
Technical field
The invention belongs to electric and electronic technical field, more particularly to the topological structure of the dc circuit breaker of direct current transportation and
Its control method, more particularly to a kind of high-performance and low-cost direct current is defeated, the topological project of power distribution network dc circuit breaker and its control
Strategy.
Background technology
Dc circuit breaker is that direct current is defeated, carrying rated current, shut-off fault current, the pass for turning off load current in power distribution network
Button apparatus, can reliably remove fault current, prevent fault coverage from expanding.With multi-terminal HVDC transmission technology, intelligent grid with
Direct current distribution technology, distributed power source and direct-current micro-grid technology are developed rapidly, dc circuit breaker to the reliable of power network, high-quality,
Economical operation is significant.But, because DC current does not have in the arc extinguishing problem that natural zero-crossing point brings, interrupting process
Overvoltage and energy absorption the problems such as also turn into dc circuit breaker Research Challenges.
Current dc circuit breaker mainly has four kinds of technology paths：Using the direct current interruption of the direct cut-off current of mechanical switch
Device, responsiveness is slow, and switch can not meet the requirement of quick-action and economy；Using the dc circuit breaker of oscillating circuit arc extinguishing,
Actuation time is longer, and control difficulty is also larger；Using all solid state dc circuit breaker of power electronic devices, it is lost during normal operation
It is higher, cause the autgmentability to higher voltage grade poor；It is disconnected using mechanical switch and the mixed type direct current of power electronic devices
Road device.Wherein, mixed type dc circuit breaker is the application for being relatively more suitable for direct current transmission and distribution net.It is ABB AB as shown in Figure 1
Patent WO2011141054A1 mixed type dc circuit breaker circuit theory diagrams, ABB mixed type dc circuit breaker is applied to respectively
Operating mode is planted, but is significantly had the disadvantage, to realize that electric current two-way circulates and two-way shut-off, the full-control type electric power electricity in dc circuit breaker
Sub- device 6 connects into bi-directional configuration, and this allows for number of devices and doubled, and equipment cost is significantly improved.It is illustrated in figure 2 state
The mixed type dc circuit breaker circuit theory diagrams of grid company intelligent grid research institute of family patent 201310364653.3, the patent
The all-controlling power electronics device 6 of main switch be check configuration, therefore reduce departmental cost.But its dc circuit breaker is real
Existing two-way through-flow and two-way shut-off, two of which auxiliary change-over switch is constituted using two all-controlling power electronics devices 6
Inverse parallel structure, and respectively with connect resistance R1 and disconnecting switch BRK11, series connection resistance R2 and disconnecting switch BRK21 simultaneously
Joint group is into therefore the quantity of its all-controlling power electronics device doubles；In reduced-current, voltages such as maintenance separating brake, combined floodgates
Stress occasion, soft using resistance R1 and disconnecting switch BRK11, resistance R2 and disconnecting switch BRK21 composition opens circuit, and adopted
Switched with arrester MOV2, AC circuit breaker BRK3, inductance L and electric capacity the C DC load constituted, significantly increase equipment cost
With the complexity of control.
In order to tackle the high Cost Problems of mixed type dc circuit breaker, the mixing of high-performance and low cost is badly in need of in direct current transportation
Type dc circuit breaker.
The content of the invention
The purpose of the present invention proposes the topological structure and its control method of a kind of dc circuit breaker, it is characterised in that described
The topological structure of dc circuit breaker uses " T-shaped " bidirectionally symmetric structure；Should " T-shaped " bidirectionally symmetric structure dc circuit breaker by the
One current path 1, the second current path 2 and the 3rd current path 3 are constituted, and the second current path 2 and the 3rd current path 3 are in parallel
The T-type structure of bi-directional symmetrical is connected into the midpoint of the first current path 1 afterwards；The leading-out terminal a and direct current of first current path 1
The equivalent inductance L9 of electrical power trans mission/distribution system one end connection, the middle leading-out terminal b and the second current path 2 of the first current path 1
With one end connection after the parallel connection of the 3rd current path 3, another leading-out terminal c of the first current path 1 and direct current are defeated, distribution wire
Road is connected；Other end ground connection after second current path 2 and the parallel connection of the 3rd current path 3；Wherein equivalent inductance L9 is in direct current
In breaker operating loop, including direct current transmission and distribution system converter bridge arm inductance, smoothing reactor and line inductance etc.
Total equivalent inductance.
First current path 1 is made up of the first auxiliary circuit breaker 16 and the second auxiliary circuit breaker 17.
Second current path 2 is at least made up of a 3rd unidirectional all-controlling power electronics device 63, with cutout
Effect；Its each 3rd unidirectional all-controlling power electronics device 63 is directly connected, and series connection number is defeated, distribution line according to direct current
High, medium and low different voltage class are determined, and should have certain redundancy；The all-controlling power electronics device is by an IGBT device
Constituted with the diode D of a reverse parallel connection.
3rd current path 3 is made up of energy absorption units, and energy absorption units include at least one arrester 15,
Each arrester 15 is in parallel or series；The rated voltage and residual voltage of its arrester are by direct current is defeated, power distribution network DC side rated voltage,
The resistance to voltage levels of one auxiliary circuit breaker 16 and the second auxiliary circuit breaker 17, the resistance to voltage levels of the second current path 2 are determined.
First auxiliary circuit breaker is composed in series by the first Fast mechanical switch 4 and the first convertor unit 18, and described
Two auxiliary circuit breakers are composed in series by the second convertor unit 19 and the second Fast mechanical switch 14；First auxiliary circuit breaker and second
Auxiliary circuit breaker symmetrical configuration, element is identical.
First convertor unit 18 and it is made up of a first unidirectional all-controlling power electronics device 61, the second change of current list
Member 19 is made up of a second unidirectional all-controlling power electronics device 62.
First Fast mechanical switch and the second Fast mechanical switch are parameter identical element；Use Quick mechanical
Switch or the two-way inverse parallel structure using device for high-power power electronic V；In electric current second is transferred to from the first current path
Disconnect, mainly serve pressure-resistant after current path.
The device for high-power power electronic includes the half control type and full-control type device of IGCT OR gate pole cut-off crystal brake tube
Part.
The all-controlling power electronics device is IGBT, IGCT, IEGT and BiGT of crimp type or solder type.
The dc circuit breaker control method, it is characterised in that setting electric current direction first is from the first auxiliary circuit breaker stream
To the second auxiliary circuit breaker, control method comprises the following steps：
(1) failure separating brake is controlled
Before failure, the first Fast mechanical switch, the first convertor unit, the second Fast mechanical switch, the second convertor unit are equal
Conducting, interruption units shut-off, electric current passes through the first current path；After failure occurs, each several part triggers control sequential by whole in advance
Fixed current limit is determined；
A. after failure occurs, a certain limit value is reached when detecting electric current, triggering interruption units are turned it on；
B. trigger the second convertor unit to turn it off, electric current is shifted rapidly from the first current path to the second current path；
C. the second Fast mechanical switch is triggered to turn it off；
D. after after the second Fast mechanical switch Trusted recovery voltage endurance capability, triggering interruption units are turned it off, the 3rd electric current
Energy absorption units in path are changed into low resistance state after shut-off overvoltage reaches its origination action voltage from high-impedance state, and electric current is fast
Speed is shifted from the second current path to the 3rd current path；
E. energy and over-voltage, the second convertor unit during the arrester dissipation in energy absorption units is cut-off
It is effectively protected with interruption units；
F. triggering isolation of system switch 8 is turned it off, and completes failure separating brake；
(2) maintenance separating brake control
A. triggering interruption units are turned it on；
B. the second convertor unit is triggered to turn it off；
C. the second Fast mechanical switch is triggered to turn it off；
D. after after the second Fast mechanical switch Trusted recovery voltage endurance capability, triggering interruption units are turned it off；
E. energy and over-voltage during the arrester dissipation in the 3rd current path energy absorption units is cut-off；
F. triggering isolation of system switch 8 is turned it off, and completes maintenance isolation.
(3) shutting-brake control
A. the second convertor unit is triggered to turn it on；
B. the first Fast mechanical switch, the second Fast mechanical switch is triggered to turn it on；
C. triggering isolation of system switch 8 is turned it on, and completes normal operation of closing a floodgate.
(4) Fault Identification is controlled
A. detect that electric current reaches that triggering interruption units are turned it on when adjusting limit value in advance；
If b. detection electric current recovers, triggering interruption units are turned it off；If detecting, electric current continues to raise, and triggers second change of current
Unit is turned it off, and the second Fast mechanical switch of triggering is turned it off；
If c. detection electric current recovers, the second convertor unit of triggering is turned it on, and the second Fast mechanical switch of triggering leads it
Logical, triggering interruption units are turned it off；If detecting, electric current continues to raise, and triggering interruption units are turned it off.
The dc circuit breaker control method all assumes that the sense of current flows to the second backup shutdoun from the first auxiliary circuit breaker
Device, when electric current reverse circulated, should operate the first convertor unit and the first Fast mechanical switch, other steps in correspondence step
It is identical.
The beneficial effects of the invention are as follows compared with prior art, have the following advantages that：
1) circuit breaker circuit topology proposed by the present invention, using " T-shaped " bidirectionally symmetric structure, effectively reduces core
Heart all-controlling power electronics device usage quantity, significantly reduces cost.
2) circuit breaker circuit topology proposed by the present invention, flexible structure, autgmentability is strong, meet different voltages,
Direct current under current class cut-offs requirement.
3) circuit breaker circuit topology proposed by the present invention, on-state loss is relatively low during normal operation, energy absorption
It is good with Overvoltage suppressing effect.
4) circuit breaker circuit control strategy proposed by the present invention, can reliably tackle failure separating brake, maintenance point
The difference operating mode such as lock, combined floodgate, equipment each several part element can be effectively protected in interrupting process, and fault detect is controlled with identification
Strategy processed can effectively reduce equipment malfunction work.
Therefore, mixed type dc circuit breaker of the invention is that cost is relatively low, on-state loss, cutout level, resistance to voltage levels, dynamic
Make the performance indications such as speed, control strategy excellent direct-current breaker topology and control program.
Brief description of the drawings
The dc circuit breaker circuit theory diagrams that Fig. 1 provides for the patent of invention WO2011141054A1 of ABB AB.
Fig. 2 is the direct current interruption that the graduate patent of invention 201310364653.3 of State Grid Corporation of China's intelligent grid is provided
Device circuit theory diagrams.
The direct-current breaker topology structural representation that Fig. 3 provides for the present invention.
The dc circuit breaker circuit theory diagrams that Fig. 4 provides for the present invention.
The circuit theory diagrams for another dc circuit breaker that Fig. 5 provides for the present invention.
Fig. 6 constitutes the circuit theory diagrams of case for the dc circuit breaker that the present invention is provided.
The main electrical scheme schematic diagram for the dc circuit breaker application case 1 that Fig. 7 provides for the present invention.
The main electrical scheme schematic diagram for the dc circuit breaker application case 2 that Fig. 8 provides for the present invention.
The dc circuit breaker failure separating brake timing diagram that Fig. 9 provides for the present invention.
Figure 10 overhauls separating brake timing diagram for the dc circuit breaker that the present invention is provided.
The dc circuit breaker combined floodgate timing diagram that Figure 11 provides for the present invention.
The dc circuit breaker Fault Identification control sequential figure that Figure 12 provides for the present invention.
Embodiment
The present invention proposes the topological structure and its control method of dc circuit breaker, below in conjunction with the accompanying drawings, to the present invention's
Technology contents are described in further detail.
The direct-current breaker topology structural representation that Fig. 3 provides for the present invention.In Fig. 3, the topology of the dc circuit breaker
Structure uses " T-shaped " bidirectionally symmetric structure；The dc circuit breaker of " T-shaped " bidirectionally symmetric structure is somebody's turn to do by the first current path 1, second
The current path 3 of current path 2 and the 3rd is constituted, after the second current path 2 and the parallel connection of the 3rd current path 3 with connect into it is two-way right
The midpoint connection of first current path 1 of the T-type structure of title；The leading-out terminal a and direct current transmission and distribution system of first current path 1
Equivalent inductance L9 one end connection, wherein equivalent inductance L9 is in dc circuit breaker operating loop, to include direct current transmission and distribution
Total equivalent inductance including system converter bridge arm inductance, smoothing reactor and line inductance etc., equivalent inductance L9's is another
The one end for switching 8 with isolation of system is held to be connected, the middle leading-out terminal b of the first current path 1 and the second current path 2 and the 3rd
One end connection after the parallel connection of current path 3, another leading-out terminal c of the first current path 1 is connected with DC power transmission line；The
Two current paths 2 are constituted comprising at least one the 3rd unidirectional all-controlling power electronics device 63, with cutout effect；The full control
Type power electronic devices is constituted by IGBT, IGCT, IEGT or BiGT device and with the diode D of reverse parallel connection；Described each 3rd
Unidirectional all-controlling power electronics device 63 is directly connected, and series connection number is defeated, distribution line high, medium and low different electric according to direct current
Press grade to determine, and there should be certain redundancy.3rd current path 3 is made up of energy absorption units, and energy absorption units are comprising extremely
A few energy absorbing element, its energy absorbing element is arrester 15, and each arrester 15 is in parallel or series；Each arrester 15
Rated voltage and residual voltage are by direct current is defeated, power distribution network DC side rated voltage, the first auxiliary circuit breaker 16 and the second auxiliary circuit breaker
17 resistance to voltage levels, the resistance to voltage levels of the second current path 2 are determined.
First auxiliary circuit breaker is composed in series by the first Fast mechanical switch 4 and the first convertor unit 18, and described
Two auxiliary circuit breakers are composed in series by the second convertor unit 19 and the second Fast mechanical switch 14.First auxiliary circuit breaker and second
Auxiliary circuit breaker symmetrical configuration, element is identical.
First convertor unit 18 is made up of a first unidirectional all-controlling power electronics device 61, the second convertor unit
19 are made up of a second unidirectional all-controlling power electronics device 62.
The dc circuit breaker circuit theory diagrams that Fig. 4 provides for the present invention.The first current path 1 in Fig. 4 is by first change of current
The first auxiliary circuit breaker 16 (as shown in Figure 3) and the second convertor unit that the Fast mechanical switch 4 of unit 18 and first is composed in series
19 the second auxiliary circuit breakers 17 (as shown in Figure 3) being composed in series with the second Fast mechanical switch 14 are composed in series；Wherein first
The symmetrical configuration of 16 and second auxiliary circuit breaker of auxiliary circuit breaker 17, element is identical.But when electric current flows from the first auxiliary circuit breaker 16
During to the second auxiliary circuit breaker 17, electric current is unidirectional by the diode D and second of the first unidirectional all-controlling power electronics device 61
The IGBT device of all-controlling power electronics device 62；When electric current from the second auxiliary circuit breaker 17 flows to the first auxiliary circuit breaker 16
When, the unidirectional all-controlling power electronics devices of diode D and first that electric current passes through the second unidirectional all-controlling power electronics device 62
61 IGBT device；Second current path 2 is composed in series by multiple three unidirectional all-controlling power electronics devices 63, is played cutout and is made
With；Its number of connecting is according to direct current is defeated, distribution line high, medium and low different voltage class determine, and should have certain redundancy；The
Energy absorption units in three current paths 3 include at least one arrester 15, and arrester 15 can in parallel or series, such as Fig. 4
Shown is in parallel.The parameters such as the rated voltage and residual voltage of arrester are by direct current is defeated, distribution line DC side rated voltage, first
The resistance to voltage levels of the auxiliary circuit breaker 17 of auxiliary circuit breaker 16 and second, the resistance to voltage levels of the second current path 2 are determined.
First Fast mechanical switch 4 and the second Fast mechanical switch 14 are parameter identical element；Opened using Quick mechanical
The purpose of pass is, in electric current after the first current path is transferred to the second current path, and the first current path quickly disconnects, generally
Disconnected in 1ms, and undertake pressure-resistant effect upon opening.First Fast mechanical switch 4 and the second Fast mechanical switch 14 can
Using two-way inverse parallel device for high-power power electronic, shown in the label 22, label 23 such as Fig. 5.
The device for high-power power electronic includes such as IGCT half control type device, and OR gate pole cut-off crystal brake tube etc. is entirely
Control type device, or the wholly-controled device such as IGBT.
Antiparallel half control type power electronic devices V is used in Fig. 5, its label 22,23 is fast instead of first in Fig. 4 respectively
The purpose of the fast Fast mechanical switch 14 of mechanical switch 4 and second be low voltage grade (such as 10kV) direct-flow distribution system should
In, half control type power electronic devices V (such as IGCT) voltage endurance capability is strong, and on-state loss is not high, and can avoid mechanical switch
The contact abrasion and service life problem brought by multi-pass operation.
Fig. 6 is the circuit theory diagrams that dc circuit breaker is constituted, and the circuit theory diagrams that the dc circuit breaker is constituted represent direct current
Equivalent Network circuit, the equivalent circuit is by direct current is defeated, the equivalent current conversion station of distribution system (or equivalent source) 20, isolation of system are switched
8th, equivalent inductance L9, dc circuit breaker and equivalent load R21 compositions, wherein equivalent inductance L9 is in dc circuit breaker operating loop
In, comprising total equivalent inductance including direct current transmission and distribution system converter bridge arm inductance, smoothing reactor and line inductance etc.,
Dc circuit breaker shown in figure uses Fig. 4 topological structure.As shown in fig. 6, the direct-current breaker topology structure that the present invention is provided
It is made up of the first current path 1, the second current path 2 and the 3rd current path 3, the second current path 2 and the 3rd current path 3
The T-type structure of bi-directional symmetrical is connected into after parallel connection with the first current path 1；The leading-out terminal a and direct current of first current path 1 are defeated
The equivalent inductance L9 of distribution system one end connection, the equivalent inductance L9 of the direct current transmission and distribution system other end is opened with isolation of system
Close 8 one end connection, the other end and the direct current of isolation of system switch 8 are defeated, the equivalent current conversion station of distribution system (or equivalent source) 20
Positive terminal connection, equivalent current conversion station or the negative pole end of equivalent source 20 ground connection；The middle leading-out terminal b of first current path 1 with
One end connection after second current path 2 and the parallel connection of the 3rd current path 3；Second current path 2 and the 3rd current path 3 are in parallel
Other end ground connection afterwards；Another leading-out terminal c of first current path 1 and direct current are defeated, distribution line equivalent load R21
One end is connected, equivalent load R21 other end ground connection.Remaining is identical with Fig. 5 structures；
As shown in fig. 6, the sense of current flows to the second auxiliary circuit breaker 17 from the first auxiliary circuit breaker 16, direct current it is defeated, match somebody with somebody
When electric line is normally run, the first Fast mechanical switch 4, the first unidirectional full-control type power electronic device in the first current path 1
Diode D in part 61, the IGBT device in the second unidirectional all-controlling power electronics device 62 and the second Fast mechanical switch 14
It is both turned on, the IGBT in the 3rd unidirectional all-controlling power electronics device 63 in the second current path 2 is turned off, electric current passes through
One current path 1；When short trouble occurs for DC line distal end, i.e., short trouble occurs at equivalent load R21 ends, at this moment line
Road electric current rises rapidly, and a certain setting limit value is reached when detecting electric current, and each 3rd list in the second current path 2 is triggered first
IGBT device into all-controlling power electronics device 63 is turned it on, then to trigger in the second auxiliary circuit breaker 17 second unidirectional complete
IGBT device in control type power electronic device 62 is turned it off, and electric current is rapidly from the first current path 1 to the second current path 2
Transfer；It is then powered off the second Fast mechanical switch 14 in the second auxiliary circuit breaker 17；Treat that the second Fast mechanical switch 14 is reliable
Recover after voltage endurance capability, then turn off the IGBT in each 3rd unidirectional all-controlling power electronics device 63 in the second current path 2
Arrester 15 in device, the 3rd current path 3 is switched to low after shut-off overvoltage reaches its origination action voltage by high-impedance state
Resistance state, electric current is shifted rapidly from the second current path 2 to the 3rd current path 3；Arrester 15 in 3rd current path 3 dissipates
The 3rd unidirectional full control in energy and over-voltage in interrupting process, the second auxiliary circuit breaker 17 and the second current path 2
Type power electronic devices 63 is effectively protected；Last turning off system disconnecting switch 8, completes switch off current.
As shown in fig. 6, the sense of current flows to the first auxiliary circuit breaker 16 from the second auxiliary circuit breaker 17, direct current it is defeated, match somebody with somebody
When electric line is normally run, the first Fast mechanical switch 4, the second unidirectional full-control type power electronic device in the first current path 1
Diode D in part 62, the IGBT device in the first unidirectional all-controlling power electronics device 61 and the second Fast mechanical switch 14
It is both turned on, the IGBT in the 3rd unidirectional all-controlling power electronics device 63 in the second current path 2 is turned off, electric current passes through
One current path 1；When short trouble occurs for DC line near-end, i.e., short trouble occurs in equivalent current conversion station (or equivalent electric
Source) 20 ends, at this moment line current rise rapidly, reach a certain setting limit value when detecting electric current, trigger first the second electric current lead to
The IGBT in each 3rd unidirectional all-controlling power electronics device 63 in road 2 is turned it on, then triggers the first auxiliary circuit breaker 16
In IGBT in the first unidirectional all-controlling power electronics device 61 turn it off, electric current is rapidly from the first current path 1 to second
Current path 2 is shifted；It is then powered off the first Fast mechanical switch 4 in the first auxiliary circuit breaker 16；Treat that the first Quick mechanical is opened
Close after 4 Trusted recovery voltage endurance capabilities, then turn off in the second current path 2 in each 3rd unidirectional all-controlling power electronics device 63
Arrester 15 in IGBT, the 3rd current path 3 is switched to low after shut-off overvoltage reaches its origination action voltage by high-impedance state
Resistance state, electric current is shifted rapidly from the second current path 2 to the 3rd current path 3；Arrester 15 in 3rd current path 3 dissipates
The 3rd unidirectional full control in energy and over-voltage in interrupting process, the first auxiliary circuit breaker 16 and the second current path 2
Type power electronic devices 63 is effectively protected；Last turning off system disconnecting switch 8, completes switch off current.
Fig. 7 show dc circuit breaker application case 1.As shown in fig. 7, this is a multi-terminal HVDC transmission network, exchange
System A, B, C and D are connected respectively through transformer T with current conversion station E, F, G, H, constitute a multi-terminal HVDC transmission network, directly
Stream breaker DCB is respectively installed on each port of current conversion station E, F, G, H DC line.When multi-terminal HVDC transmission network
During normal operation, each dc circuit breaker DCB is closed.When failure occurs, by taking the DC bipolar failure of most serious as an example, when event
Barrier occurs in current conversion station F proximal outlets f1During point, dc circuit breaker DCB1 disconnects, and DCB1 closes recovery again after pending fault is removed
Normal operation；When failure occurs in current conversion station F distal ends DC power transmission line f2During point, dc circuit breaker DCB2 disconnects, pending fault
DCB2 closes the normal operation of recovery again after removing；When failure occurs in other current conversion station near-ends or distal end, the current conversion station pair
The dc circuit breaker DCB answered disconnects, and DCB closes the normal operation of recovery again after pending fault is removed.
Fig. 8 show dc circuit breaker application case 2.As shown in figure 8, this is a Multi-port direct-current distribution network network.Exchange
System A and AC system B accesses dc distribution network respectively through AC/DC current transformers, and dc circuit breaker DCB is installed in each several part
On current transformer exit and DC line；DC distribution net is by AC load, DC load, photovoltaic generation, wind-power electricity generation, storage
Can equipment and low-voltage direct power distribution network composition.Wherein low-voltage direct power distribution network is connect by commutator transformer and dc circuit breaker DCB
Enter DC network；AC load and wind-power electricity generation access DC network by AC/DC current transformers and dc circuit breaker DCB respectively；
DC load, photovoltaic generation and energy storage device access DC network by DC/DC current transformers and dc circuit breaker DCB；Work as direct current
When network is normally run, each dc circuit breaker DCB is closed, when failure occurs in dc bus f3During point, dc circuit breaker
DCB3 disconnects, and DCB3 closes the normal operation of recovery again after pending fault is removed；When failure occurs in DC line f4During point, direct current
Breaker DCB4 disconnects, and DCB4 closes the normal operation of recovery again after pending fault is removed.
Fig. 9 is separating brake timing diagram of the dc circuit breaker (circuit structure as shown in Figure 6) in failure.As shown in figure 9, straight
Flowing circuit breaker failure separating brake rate-determining steps is：
1)0-t1Stage, system is normally run, and the sense of current flows to the second auxiliary circuit breaker from the first auxiliary circuit breaker 16
17.The diode in the first Fast mechanical switch 4, the first unidirectional all-controlling power electronics device 61 in first current path 1
IGBT device in D, the second Fast mechanical switch 14 and the second unidirectional all-controlling power electronics device 62 is both turned on, the second electric current
The IGBT in the 3rd unidirectional all-controlling power electronics device 63 in path 2 is turned off, the arrester 15 in the 3rd current path
Both end voltage is less than its operation voltage, and arrester 15 keeps high-impedance state, and only Weak current passes through, and is approximately open circuit.First electricity
Logical circulation road 1 flows through rated current iN；
2) t after failure1At the moment, limit value i is reached when detecting electric current1, it is each 3rd unidirectional in the second current path 2 of triggering
IGBT in all-controlling power electronics device 63 is turned it on, and now fault current continues to keep rising；
3)t2Moment, when detection electric circuit inspection to fault current exceedes limit value i2When, the in the second auxiliary circuit breaker 17 of triggering
IGBT in two unidirectional all-controlling power electronics devices 62 is turned it off, and fault current is rapidly from the first electric current through-flow 1 to second
Current path 2 is shifted；
4)t3Moment, when detect electric circuit inspection to the electric current in the first electric current through-flow 1 be zero or a certain very low value when, close
The second Fast mechanical switch 14 in disconnected second auxiliary circuit breaker 17, now because electric current is from the first electric current through-flow 1 to second
Current path 2 is largely shifted, and the second Fast mechanical switch 14 can realize that no electric arc cut-offs, its responsiveness, reliability and life-span
It is significantly improved；
5)t4Moment, when detection electric circuit inspection to fault current reaches limit value ib, and the second Fast mechanical switch 14 is reliable extensive
After multiple voltage endurance capability, the IGBT in the second current path 2 of shut-off in the 3rd unidirectional all-controlling power electronics device 63, the 3rd is unidirectional
Higher voltage overshoot is produced when all-controlling power electronics device 63 is turned off, when the voltage overshoot is reached in the 3rd electric current through-flow 3
During the operation voltage of arrester 15, arrester 15 is changed into low resistance state by high-impedance state, and fault current is rapidly from the second electric current through-flow 2
Shifted to the 3rd current path 3；
6)t4-t5The energy in the dissipation turn off process of arrester 15 in stage, the 3rd electric current through-flow 3, the two ends of arrester 15
Voltage maintains the second unidirectional electric current of all-controlling power electronics device 62 and second in its residual voltage level, the second auxiliary circuit breaker
The 3rd unidirectional all-controlling power electronics device 63 respectively connected in path obtains reliably protecting.Failure in 3rd electric current through-flow 3
Electric current reduces rapidly in energy dissipation process；
7)t5Moment, turning off system disconnecting switch 8 removes failure aftercurrent, completes switch off current.
Figure 10 is timing diagram of 6 dc circuit breakers (circuit structure as shown in Figure 6) when overhauling separating brake.In maintenance separating brake
When, the electric current of dc circuit breaker shut-off is system nominal current iN, voltage, current stress are smaller in interrupting process.Such as Figure 10 institutes
Show, dc circuit breaker maintenance separating brake rate-determining steps are：
1)t1Before moment, system is normally run, and the sense of current flows to the second backup shutdoun from the first auxiliary circuit breaker 16
Device 17.Two poles in the first Fast mechanical switch 4, the first unidirectional all-controlling power electronics device 61 in first current path 1
IGBT in pipe D, the second Fast mechanical switch 14 and the second unidirectional all-controlling power electronics device 62 is both turned on, and the second electric current leads to
The IGBT in the 3rd unidirectional all-controlling power electronics device 63 in road 2 is turned off, 15 liang of the arrester during the 3rd electric current is through-flow
Terminal voltage is less than its operation voltage, and arrester 15 keeps high-impedance state, and only Weak current passes through, and is approximately open circuit.First electric current
Path 1 flows through rated current iN；
2)t1At the moment, perform the 3rd unidirectional full-control type power electronic device in maintenance sub-switching operation, the second current path 2 of triggering
IGBT in part 63 is turned it on；
3)t2IGBT in moment, the second auxiliary circuit breaker 17 of triggering in the second unidirectional all-controlling power electronics device 62 makes
It is turned off, and fault current is shifted rapidly from the first electric current through-flow 1 to the second current path 2；
4)t3Moment, when detect electric circuit inspection to the electric current in the first electric current through-flow 1 be zero or a certain very low value when, close
The second Fast mechanical switch 14 in disconnected second auxiliary circuit breaker 17, now because electric current is from the first electric current through-flow 1 to second
Current path 2 is largely shifted, and the second Fast mechanical switch 14 can realize that no electric arc cut-offs, its responsiveness, reliability and life-span
It is significantly improved；
5)t4Moment, after electric circuit inspection is detected to 14 Trusted recovery voltage endurance capability of the second Fast mechanical switch, shut-off the
IGBT in two current paths 2 in the 3rd unidirectional all-controlling power electronics device 63, the 3rd unidirectional all-controlling power electronics device
Higher voltage overshoot is produced during 63 shut-off, the voltage overshoot reaches the operation voltage of arrester 15 in the 3rd electric current through-flow 3, kept away
Thunder device 15 is changed into low resistance state by high-impedance state, and fault current is shifted rapidly from the second electric current through-flow 2 to the 3rd current path 3；
6)t5The energy in the dissipation turn off process of arrester 15 in moment, the 3rd electric current through-flow 3, the two ends of arrester 15 electricity
The second unidirectional electric current of all-controlling power electronics device 62 and second that pressure is maintained in its residual voltage level, the second auxiliary circuit breaker leads to
3rd unidirectional all-controlling power electronics device 63 of each series connection in road obtains reliably protecting.Failure in 3rd electric current through-flow 3
Electric current reduces rapidly in energy dissipation process；
7)t6Moment, turning off system disconnecting switch 8 removes aftercurrent, completes maintenance isolation.
Figure 11 is timing diagram when dc circuit breaker (circuit structure as shown in Figure 6) closes a floodgate.As shown in Figure 10, direct current breaks
Road device shutting-brake control step is：
1)t1Before moment, dc circuit breaker is off state.The first Fast mechanical switch 4 in first current path 1,
IGBT, the second quick machine in the first unidirectional all-controlling power electronics device 62 of unidirectional all-controlling power electronics device 61 and second
Tool switch 14 is turned off, and the IGBT in the 3rd unidirectional all-controlling power electronics device 63 in the second current path 2 is turned off, the
The both end voltage of arrester 15 during three electric currents are through-flow is less than its operation voltage, and arrester 15 keeps high-impedance state, only Weak current
Pass through, be approximately open circuit；
2)t1At the moment, perform the second unidirectional full-control type power electronic device in closing operation, the second auxiliary circuit breaker 17 of triggering
IGBT in part 62 is turned it on；
3)t2Moment, the first Fast mechanical switch 4 of triggering and the second Fast mechanical switch 14 are turned it on；
4)t3Moment, triggering isolation of system switch 8 is turned it on, and the first electric current is through-flow to flow through rated current i in 1N, complete
Closing operation, system is normally run.
Dc circuit breaker (circuit structure as shown in Figure 6) Fault Identification control sequential figure that Figure 12 provides for the present invention.
In actual motion, it is considered to the operating mode that the operating mode and failure that line current temporarily rises slowly develop, detection circuit needs continuous
Levels of current is detected to perform corresponding operating.As shown in figure 12, dc circuit breaker Fault Identification rate-determining steps are：
1)t1Before moment, system is normally run, and the sense of current flows to the second backup shutdoun from the first auxiliary circuit breaker 16
Device 17.Two poles in the first Fast mechanical switch 4, the first unidirectional all-controlling power electronics device 61 in first current path 1
IGBT in pipe D, the second Fast mechanical switch 14 and the second unidirectional all-controlling power electronics device 62 is both turned on, and the second electric current leads to
The IGBT in the 3rd unidirectional all-controlling power electronics device 63 in road 2 is turned off, 15 liang of the arrester during the 3rd electric current is through-flow
Terminal voltage is less than its operation voltage, and arrester 15 keeps high-impedance state, and only Weak current passes through, and is approximately open circuit.First electric current
Path 1 flows through rated current iN；
2)t1Moment, detection electric circuit inspection to electric current rises.When electric current is in t2Moment reaches limit value i1When, the electricity of triggering second
IGBT in logical circulation road 2 in the 3rd unidirectional all-controlling power electronics device 63 is turned it on；
3)t3At the moment, detect electric current and continue to raise and reach limit value i2When, trigger the second list in the second auxiliary circuit breaker 17
IGBT into all-controlling power electronics device 62 is turned it off, and electric current is transferred to the second electric current from the first electric current through-flow 1 rapidly
Path 2；
4)t4At the moment, detect electric current and continue to raise and reach limit value i3When, it is second fast in triggering the second electric current through-flow 2
Fast mechanical switch 14 is turned it off；
5)t5At the moment, detect the second unidirectional full-control type power electronic in current reduction, the second auxiliary circuit breaker 17 of triggering
IGBT in device 62 is turned it on；
6)t6At the moment, detect electric current and return near rated value, the second Quick mechanical in the first current path 1 of triggering
Switch 14 is turned it on；
7)t7Moment, detection electric current returns to rated value iN, trigger the 3rd unidirectional full-control type electric power in the second current path 2
IGBT in electronic device 63 is turned it off, and dc circuit breaker recovers normal operation.
Should be according to the continuous cycle detection levels of current of above-mentioned steps until detection circuit judges failure during curent change
Occur and perform failure sub-switching operation.
It should be noted that those described above embodiment is only illustrative of the invention and is not intended to limit the scope of the invention.
It should be further understood that after the content of the invention lectured has been read, those skilled in the art may make each to the present invention
Plant and change or change, those are changed or the amended equivalent form of value equally falls within the model that the application appended claims are limited
Enclose.
Claims (1)
1. a kind of control method of direct-current breaker topology structure, the direct-current breaker topology structure is two-way right using " T-shaped "
Claim structure；The direct-current breaker topology structure is by the first current path (1), the second current path (2) and the 3rd current path (3)
Constitute, connected into after the second current path (2) and the parallel connection of the 3rd current path (3) with the midpoint of the first current path (1) two-way
Symmetrical T-type structure；B leading-out terminals and the second current path (2) and the 3rd current path in the middle of first current path (1)
(3) one end connection after in parallel, the c leading-out terminals of the first current path (1) are defeated with direct current, distribution line is connected；Second electric current
Other end ground connection after path (2) and the 3rd current path (3) are in parallel；The a leading-out terminals and direct current of first current path (1) are defeated
The equivalent inductance L9 of distribution system one end connection, wherein equivalent inductance L9 is in dc circuit breaker operating loop, comprising straight
Flow total equivalent inductance including electrical power trans mission/distribution system converter bridge arm inductance, smoothing reactor and line inductance；First electric current leads to
Road (1) is made up of the first auxiliary circuit breaker (16) and the second auxiliary circuit breaker (17)；First auxiliary circuit breaker is by the first quick machine
Tool switchs (4) and the first convertor unit (18) and is composed in series, and second auxiliary circuit breaker is by the second convertor unit (19) and the
Two Fast mechanical switch (14) are composed in series；First auxiliary circuit breaker and the second auxiliary circuit breaker symmetrical configuration, element are identical；Institute
It is parameter identical element to state the first Fast mechanical switch and the second Fast mechanical switch, using Fast mechanical switch or use
Device for high-power power electronic V two-way inverse parallel structure, in electric current after the first current path is transferred to the second current path
Disconnect, mainly serve pressure-resistant；Characterized in that, the sense of current of setting direct-current breaker topology structure first is aided in from first
Breaker flows to the second auxiliary circuit breaker, and its control method comprises the following steps：
(1) failure separating brake is controlled
Before failure, the first Fast mechanical switch, the first convertor unit, the second Fast mechanical switch, the second convertor unit are both turned on,
Interruption units are turned off, and electric current passes through the first current path；After failure occurs, each several part triggers control sequential by the electricity adjusted in advance
Restriction value is determined；
A. after failure occurs, a certain limit value is reached when detecting electric current, triggering interruption units are turned it on；
B. trigger the second convertor unit to turn it off, electric current is shifted rapidly from the first current path to the second current path；
C. the second Fast mechanical switch is triggered to turn it off；
D. after after the second Fast mechanical switch Trusted recovery voltage endurance capability, triggering interruption units are turned it off, the 3rd current path
In energy absorption units reached in shut-off overvoltage after its origination action voltage low resistance state be changed into from high-impedance state, electric current rapidly from
Second current path is shifted to the 3rd current path；
E. arrester in energy absorption units dissipates the energy during cut-offfing and over-voltage, the second convertor unit and disconnected
Stream unit is effectively protected；
F. triggering isolation of system switch (8) is turned it off, and completes failure separating brake；
(2) maintenance separating brake control
A. triggering interruption units are turned it on；
B. the second convertor unit is triggered to turn it off；
C. the second Fast mechanical switch is triggered to turn it off；
D. after after the second Fast mechanical switch Trusted recovery voltage endurance capability, triggering interruption units are turned it off；
E. energy and over-voltage during the arrester dissipation in the 3rd current path energy absorption units is cut-off；
F. triggering isolation of system switch (8) is turned it off, and completes maintenance isolation；
(3) shutting-brake control
A. the second convertor unit is triggered to turn it on；
B. the first Fast mechanical switch, the second Fast mechanical switch is triggered to turn it on；
C. triggering isolation of system switch (8) is turned it on, and completes normal operation of closing a floodgate；
(4) Fault Identification is controlled
A. detect that electric current reaches that triggering interruption units are turned it on when adjusting limit value in advance；
If b. detection electric current recovers, triggering interruption units are turned it off；If detecting, electric current continues to raise, and triggers the second convertor unit
Turn it off, the second Fast mechanical switch of triggering is turned it off；
If c. detection electric current recovers, the second convertor unit of triggering is turned it on, and the second Fast mechanical switch of triggering is turned it on, and is touched
Hair interruption units are turned it off；If detecting, electric current continues to raise, and triggering interruption units are turned it off；
It is auxiliary that the control method of the direct-current breaker topology structure all assumes that the sense of current flows to second from the first auxiliary circuit breaker
Breaker is helped, when electric current reverse circulated, the first convertor unit and the first Fast mechanical switch should be operated in correspondence step, its
His step is identical.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510363533.0A CN104900444B (en) | 2015-06-26 | 2015-06-26 | The topological structure and its control method of dc circuit breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510363533.0A CN104900444B (en) | 2015-06-26 | 2015-06-26 | The topological structure and its control method of dc circuit breaker |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104900444A CN104900444A (en) | 2015-09-09 |
| CN104900444B true CN104900444B (en) | 2017-08-04 |
Family
ID=54033050
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510363533.0A Expired - Fee Related CN104900444B (en) | 2015-06-26 | 2015-06-26 | The topological structure and its control method of dc circuit breaker |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104900444B (en) |
Families Citing this family (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105281287B (en) * | 2015-10-22 | 2018-08-07 | 中国科学院电工研究所 | A kind of direct-current breaker topology for having two-way blocking-up function based on thyristor |
| CN105281288B (en) * | 2015-10-22 | 2019-01-25 | 中国科学院电工研究所 | A kind of direct-current breaker topology having two-way blocking-up function |
| CN106646206B (en) * | 2015-10-29 | 2019-11-08 | 全球能源互联网研究院 | The dc circuit breaker compounding testing circuit and method of the compound injection of high-voltage large current |
| CN105609344B (en) * | 2016-03-22 | 2019-06-11 | 国网天津市电力公司 | A kind of hybrid direct-current breaker topology structure |
| CN105680411B (en) * | 2016-03-29 | 2018-04-06 | 中国人民解放军海军工程大学 | DC solid circuit breaker and breaking control method |
| CN107346883A (en) * | 2016-05-05 | 2017-11-14 | 南京南瑞继保电气有限公司 | A kind of DC system fault current diverting device |
| CN107346882A (en) * | 2016-05-05 | 2017-11-14 | 南京南瑞继保电气有限公司 | A kind of DC system fault current diverting device |
| CN106024497B (en) * | 2016-05-30 | 2020-11-03 | 全球能源互联网研究院 | Auxiliary circuit for high-short-circuit turn-off direct-current circuit breaker and control method thereof |
| CN107645154B (en) | 2016-07-20 | 2020-03-06 | 全球能源互联网研究院有限公司 | Novel combined direct current circuit breaker and application method thereof |
| CN106655081B (en) * | 2016-11-30 | 2019-03-01 | 平高集团有限公司 | A kind of dc circuit breaker and its control method |
| CN106970560B (en) * | 2017-04-01 | 2023-07-07 | 西安特来电智能充电科技有限公司 | Bidirectional on-off circuit applied to direct current system |
| CN109390920A (en) * | 2017-08-03 | 2019-02-26 | 华北电力大学 | A kind of novel DC-DC converter for having line fault isolating power |
| CN107729690B (en) * | 2017-11-10 | 2020-04-07 | 广东电网有限责任公司电力科学研究院 | Simulation method and device for direct-current power distribution and utilization system |
| CN111404113B (en) * | 2020-04-24 | 2023-04-25 | 四川大学 | T-shaped direct current breaker and control method thereof |
| US11973339B2 (en) * | 2020-08-10 | 2024-04-30 | Ohio State Innovation Foundation | Modular DC circuit breaker with integrated energy storage for future DC networks |
| CN112086943B (en) * | 2020-09-02 | 2022-05-24 | 东南大学 | Active fault current-limiting circuit and all-solid-state direct current breaker |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| PL2569843T3 (en) * | 2010-05-11 | 2014-06-30 | Abb Schweiz Ag | A plant for transmitting high voltage dc electric power including overvoltage protection |
| CN103457257B (en) * | 2013-08-16 | 2016-08-10 | 国家电网公司 | A kind of MTDC transmission system dc circuit breaker and control method thereof |
| CN103457258B (en) * | 2013-08-16 | 2016-04-20 | 国家电网公司 | A kind of MTDC transmission system DC circuit breaker and control method thereof |
| CN103457256B (en) * | 2013-08-16 | 2015-11-04 | 国家电网公司 | A kind of MTDC transmission system DC circuit breaker and control method thereof |
| CN103474983B (en) * | 2013-08-20 | 2015-05-13 | 国家电网公司 | High voltage and great current direct-current circuit breaker and control method thereof |
| CN103997322A (en) * | 2014-05-27 | 2014-08-20 | 西安交通大学 | Full-solidity direct-current breaker and control method thereof |
| CN104158171B (en) * | 2014-08-18 | 2017-06-06 | 国家电网公司 | A kind of high-voltage direct-current breaker topology circuit |
| CN204205577U (en) * | 2014-08-29 | 2015-03-11 | 荣信电力电子股份有限公司 | All-solid-state direct-current circuit breaker of direct-current power distribution network |
-
2015
- 2015-06-26 CN CN201510363533.0A patent/CN104900444B/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN104900444A (en) | 2015-09-09 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104900444B (en) | The topological structure and its control method of dc circuit breaker | |
| CN106099878B (en) | A kind of capacitor charging type bidirectional, dc breaker and its application | |
| Guo et al. | A thyristor full-bridge-based DC circuit breaker | |
| CN107294054B (en) | A kind of topological structure of the quick mixed type dc circuit breaker of both arms framework | |
| CN106787876B (en) | Modularized multi-level converter and high-voltage valve group earth fault protection method thereof | |
| KR20180103181A (en) | DC current interrupter and control method | |
| WO2020233180A1 (en) | Current-limiting controllable lightning arrester, converter, power transmission system, and control method | |
| CN107947131A (en) | Fault insulation and resume method based on micro- loss combined machine formula dc circuit breaker | |
| CN208433908U (en) | Voltage source converter module and inverter | |
| CN106206208A (en) | The hybrid dc circuit breaker that great power bidirectional cut-offs | |
| CN103646805B (en) | A kind of direct-current breaker topology | |
| CN107785867A (en) | A kind of dc circuit breaker for reducing drop-out current and its DC Line Fault processing strategy | |
| CN107276045A (en) | A kind of mixed DC current limiting circuit breaker | |
| CN109494693A (en) | A kind of hybrid dc circuit breaker and control method reducing reclosing impact | |
| CN110021919A (en) | Intensive bridge-type multiport mixed DC breaker and control method | |
| CN106786349A (en) | A kind of assist exchanging circuit module and high voltage DC breaker | |
| WO2015081615A1 (en) | Direct-current circuit breaker | |
| CN103457256A (en) | Direct-current breaker used for multi-terminal direct-current system and control method thereof | |
| CN101297455B (en) | A converter station | |
| CN106711930A (en) | DC circuit breaker and control method thereof | |
| CN109787206A (en) | A kind of capacitance-resistance type current-limiting type direct-current breaker topology suitable for multiterminal element and DC grid | |
| CN103441490B (en) | A kind of MTDC transmission system dc circuit breaker and control method thereof | |
| CN114172135A (en) | Double-main-breaking type multi-port hybrid direct-current circuit breaker applicable to multi-terminal direct-current power grid | |
| CN109066600B (en) | A kind of current limliting capacitance-resistance branch, resistance-capacitance type dc circuit breaker and parameter selection method | |
| CN108306266B (en) | Hybrid direct current breaker with reclosing module and control method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170804 Termination date: 20210626 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |