CN106024497A - Auxiliary circuit for high-short-circuit turn-off direct current circuit breaker and control method for auxiliary circuit - Google Patents
Auxiliary circuit for high-short-circuit turn-off direct current circuit breaker and control method for auxiliary circuit Download PDFInfo
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- CN106024497A CN106024497A CN201610371352.7A CN201610371352A CN106024497A CN 106024497 A CN106024497 A CN 106024497A CN 201610371352 A CN201610371352 A CN 201610371352A CN 106024497 A CN106024497 A CN 106024497A
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- circuit
- capacitive branch
- power electronic
- auxiliary circuit
- electronic devices
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- 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
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
Abstract
The invention provides an auxiliary circuit for a high-short-circuit turn-off direct current circuit breaker. The direct current circuit breaker comprises shunt-wound energy absorption units and series-wound valve sections; the auxiliary circuit is connected at the two ends of each power electronic device in parallel; the auxiliary circuit comprises a first capacitive branch, a second capacitive branch, a control branch and a discharging branch; the first capacitive branch and the control branch form a first shunt-wound unit; the second capacitive branch and the discharging branch form a second shunt-wound unit; and the first shunt-wound unit and the second shunt-wound unit are connected in series. Compared with the prior art, by adoption of the auxiliary circuit for the high-short-circuit turn-off direct current circuit breaker and the control method for the auxiliary circuit provided by the invention, the turn-off current of the direct current circuit breaker can be effectively increased; the overvoltage at the two ends of each power electronic device can be lowered in the turn-off process; meanwhile, the influence on the power electronic device from the rapidly increased electric stress when the power electronic device is in short circuit can be effectively restrained, so that it is the key factor contributed to the performance improvement of the direct current circuit breaker.
Description
Technical field
The present invention relates to electric and electronic technical field, be specifically related to a kind of high short circuit and turn off dc circuit breaker auxiliary circuit and control thereof
Method processed.
Background technology
Dc circuit breaker is that direct current is defeated, carry steady-state current in power distribution network, turn off fault current, the key that turns off load current sets
Standby, it is possible to fault restriction expanded range also effectively removes fault.Along with multi-terminal HVDC transmission technology, intelligent grid and direct current distribution
Technology, distributed power source develop rapidly with direct-current micro-grid technology, and dc circuit breaker is to reliable, the high-quality of electrical network, economical operation
Significant.Meanwhile, DC current does not has natural zero-crossing point, the problem such as overvoltage and energy absorption of cut-offfing to become direct current yet
Chopper Research Challenges.
The technology path of dc circuit breaker research at present is based on hybrid dc circuit breaker, such as ABB AB's patent
WO2011141054A1 uses mechanical switch and the mixed type dc circuit breaker of full-controlled device series connection, double for realizing main shutoff branch road
To through-flow, need to make number of elements double, be greatly improved equipment cost；And national grid intelligent grid academy's patent
201310364653.3 it is mixed that middle employing all-controlling power electronics device, mechanical switch DC load switch and fly-wheel diode are constituted
Mould assembly dc circuit breaker, then significantly reduce equipment cost and control complexity.But due between bus and IGBT, and series connection
Stray inductance is there is so that series IGBT will bear huge electric stress in turn off process, be simultaneously based on this between IGBT
The cut-off current value of the dc circuit breaker opening up benefit has bigger room for promotion compared with the scheme of ABB AB so that this patent is in reality
Border application is faced with huge challenge.
Summary of the invention
In order to meet the needs of prior art, the invention provides a kind of high short circuit and turn off dc circuit breaker auxiliary circuit and control thereof
Method processed.
First aspect, the technical scheme that in the present invention, high short circuit turns off dc circuit breaker auxiliary circuit is:
Described dc circuit breaker includes energy absorption units and the series valve section of parallel connection；Described energy absorption units is kept away by least two
Thunder device composes in parallel, and described series valve section is composed in series by least two power electronic devices；Described auxiliary circuit is connected in parallel on electric power
Electronic device two ends；
Described auxiliary circuit includes the first capacitive branch, the second capacitive branch, controlling brancher and discharge paths；
Described first capacitive branch and controlling brancher form the first parallel units, described second capacitive branch and discharge paths composition the
Two parallel units；This first parallel units and the series connection of the second parallel units.
Preferably, the described positive pole of the first capacitive branch is connected with the colelctor electrode of power electronic devices, the negative pole of the second capacitive branch
It is connected with the emitter stage of power electronic devices.
Preferably, described first capacitive branch is made up of the first electric capacity and the first resistant series；
Described second capacitive branch includes the second electric capacity, and the capacitance of described second electric capacity is more than the capacitance of the first electric capacity.
Preferably, described controlling brancher includes IGCT, and the ON time scope of this IGCT is that described power electronic devices is being opened
Begin the time period between the conducting change of current and shutoff cutout.
Preferably, described discharge paths includes the second resistance；
The computing formula of resistance R of described second resistance is:
R=τ/C
Wherein, τ is the capacitor discharge time constant of described second capacitive branch, and C is the capacitance of described second capacitive branch.The
Two aspects, the technical scheme that in the present invention, high short circuit turns off dc circuit breaker auxiliary circuit control method is:
Described method includes:
Step 1: gather the electric current of power electronic devices colelctor electrode, it is judged that whether power electronic devices turns on；
Step 2: at the IGCT of the ON time internal trigger control branch road of power electronic devices；
Step 3: gather the charging current of the second capacitive branch, when this charging current electric current is zero by peak-fall, turns off institute
State IGCT.
Preferably, described ON time is 2ms.
Preferably, in described step 3 during the charging current of the second capacitive branch is zero by peak-fall, energy absorption
The spark gap conducting of unit, high voltage short circuit electric current flows through described spark gap and consumes.
Preferably, after described high voltage short circuit electric current is discharged by spark gap, the second capacitive branch is carried out by discharge paths
Electric discharge；
When after described second capacitive branch discharge off, the magnitude of voltage that magnitude of voltage is power electronic devices two ends at the first electric capacity two ends,
The magnitude of voltage at the second electric capacity two ends is zero.
Compared with immediate prior art, the invention has the beneficial effects as follows:
1, a kind of high short circuit that the present invention provides turns off dc circuit breaker auxiliary circuit and control method thereof, it is possible to be effectively improved straight
The cut-off current of stream chopper, and reduce the overvoltage at each power electronic devices two ends in turn off process, simultaneously effective press down
The impact that power electronic devices is caused by the electric stress that system drastically promotes when power electronic devices short circuit, the property to dc circuit breaker
Can promote and serve pivotal role；
2, a kind of high short circuit that the present invention provides turns off dc circuit breaker auxiliary circuit and control method thereof, works as power electronic devices
Enter short-circuit condition, when being operated in active area and make the conducting voltage Vce rapid increase of power electronic devices, it is possible to effectively limit
The rising of conducting voltage Vce, for driving protection startup to strive for the time.
Accompanying drawing explanation
The present invention is further described below in conjunction with the accompanying drawings.
Fig. 1: in the embodiment of the present invention, a kind of high short circuit turns off dc circuit breaker auxiliary circuit schematic diagram；
Fig. 2: in the embodiment of the present invention, a kind of high short circuit turns off dc circuit breaker auxiliary circuit schematic diagram；
Fig. 3: stop in dc circuit breaker in the embodiment of the present invention cell schematics；
Fig. 4: stop in dc circuit breaker in the embodiment of the present invention element circuit figure；
Fig. 5: T-shaped direct-current breaker topology schematic diagram in the embodiment of the present invention；
Wherein, 1: disconnecting switch；2: current-limiting inductance；3:IGBT；4: Fast mechanical switch；5:IGBT；6: spark gap；
7: series valve section.
Detailed description of the invention
Embodiments of the invention are described below in detail, and the example of described embodiment is shown in the drawings, the most identical or
Similar label represents same or similar element or has the element of same or like function.Describe below with reference to accompanying drawing
Embodiment is exemplary, it is intended to is used for explaining the present invention, and is not considered as limiting the invention.
A kind of high short circuit that the present invention provides turns off the embodiment of dc circuit breaker auxiliary circuit as shown in Figures 3 and 4, and it is in parallel
At series valve section and the two ends of energy absorption units of dc circuit breaker, wherein,
In the present embodiment, energy absorption units and series valve section are connected in parallel, and energy absorption units is by least two spark gap joint group
Becoming, series valve section is composed in series by least two power electronic devices.This auxiliary circuit is connected in parallel on power electronic devices two ends.
As it is shown in figure 1, auxiliary circuit includes the first capacitive branch, the second capacitive branch, controlling brancher and discharge paths.Wherein,
First capacitive branch and controlling brancher form the first parallel units, the second capacitive branch and discharge paths composition second receipts or other documents in duplicate
Unit；This first parallel units and the series connection of the second parallel units.
The positive pole of the first capacitive branch is connected with the colelctor electrode of power electronic devices, the negative pole of the second capacitive branch and power electronics device
The emitter stage of part connects.
1, the first capacitive branch
As in figure 2 it is shown, the first capacitive branch is composed in series by the first electric capacity C1 and the first resistance R1.
In the present embodiment, the capacitance value of the first electric capacity is less so that circuit can normally work, and does not opens in power electronic devices
The when of logical, the first electric capacity can undertake busbar voltage.Meanwhile, the first capacitive branch also functions to the cushioning effect to control circuit,
Voltage overshoot and the reverse recovery current of IGCT turn off process outlet in controlling brancher can be effectively reduced.
2, the second capacitive branch
As in figure 2 it is shown, the second capacitive branch includes the second electric capacity C2.
Busbar voltage is played buffer action due to the first electric capacity C1 by the present embodiment so that voltage will not be added to the second electric capacity C1
On.First electric capacity C should be less than 5Uf, therefore the capacitance of the second electric capacity C2 capacitance more than the first electric capacity C1.Second electricity
The capacitance value held is bigger such that it is able to ensure that the second electric capacity does not have charging current when circuit is properly functioning, in circuit event
Charged by fault current by conducting thyristor during barrier, on the one hand can absorb faulty circuit, can be on the other hand power electronics
Device provides the buffering turning off voltage stress with short-circuit voltage stress.
3, controlling brancher
As in figure 2 it is shown, controlling brancher includes IGCT D1.
In the present embodiment, the ON time scope of this IGCT D1 is that power electronic devices is beginning to turn on the change of current and turning off cutout
Between time period, i.e. IGCT D1 after the power electronic devices conducting change of current, power electronic devices turn off cutout before conducting i.e.
Can.After turn on thyristors, before power electronic devices turns off, bear due to the second electric capacity C2 two ends is power electronics device
Conducting voltage Vce of part, so the second electric capacity uncharged；After electric power electric device turns off, power electronic devices two ends
The induced voltage that voltage produces due to line inductance and stray inductance rises rapidly so that the second electric capacity is charged.
4, discharge paths
As in figure 2 it is shown, discharge paths includes the second resistance R2.
In the present embodiment, the resistance of the second resistance R2 determined according to the discharge time of the second electric capacity.Wanting of discharge time and static state voltage equipoise
Ask the value so that the second resistance should be too big, and the value that the power consumption requirements of static state voltage equipoise makes the second resistance should be not little.The
The computing formula of resistance R of two resistance R2 is:
R=τ/C (1)
Wherein, τ is the capacitor discharge time constant of the second electric capacity C2 in described second capacitive branch, and C is described second electric capacity C2
Capacitance, C=50uF in the present embodiment.
The control method that the high short circuit that the present invention provides turns off dc circuit breaker auxiliary circuit is:
1, the electric current of power electronic devices colelctor electrode is gathered, it is judged that whether power electronic devices turns on.
In the present embodiment, ON time is 2ms.
2, at the IGCT of ON time internal trigger control branch road of power electronic devices.
3, the charging current of the second capacitive branch is gathered, when this charging current electric current is zero by peak-fall, cutoff thyristor.
In the present embodiment during the charging current of the second capacitive branch is zero by peak-fall, taking shelter from the thunder of energy absorption units
Device turns on, and high voltage short circuit electric current flows through described spark gap and consumes.Wherein,
If after high voltage short circuit electric current is discharged by spark gap, the second capacitive branch is discharged by discharge paths.And work as
After the second capacitive branch discharge off, the magnitude of voltage that magnitude of voltage is power electronic devices two ends at the first electric capacity two ends, the second electricity
The magnitude of voltage holding two ends is zero.
The present invention turns off dc circuit breaker auxiliary circuit to high short circuit as a example by dc circuit breaker T-shaped shown in Fig. 5 and illustrates,
Supposing in the present embodiment that electric current is flowed to Fast mechanical switch 8 by disconnecting switch 1, the work process of this dc circuit breaker is:
1, normally work
When circuit normally works, IGBT3 and IGBT5 turn on, electric current successively from disconnecting switch 1, current-limiting inductance 2, IGBT3,
Fast mechanical switch 4 and IGBT5 flows through.
2, change of current work
When line end breaks down, and fault current constantly raises, now start commutation course, first turn on IGBT7, then close
Disconnected IGBT5, then electric current flows through from disconnecting switch 1, current-limiting inductance 2, IGBT3 and IGBT7 successively, works as Quick mechanical after 2ms
Switch 4 disconnection, the change of current has worked, and starts the work that stops.
3, cutout work
After cutout starts, turning off IGBT7, now fault current flows through from spark gap 6, and short circuit energy consumes in spark gap
Complete.Last disconnecting switch 1 disconnects, dc circuit breaker line disconnection.
In the work process of above-mentioned dc circuit breaker, the operation principle of auxiliary circuit is:
1, normally work
When circuit normally works, in the first capacitive branch, the first electric capacity C1 bears the voltage at IGBT two ends, the second capacitive branch
In the voltage that do not bears of the second electric capacity.
2, change of current work
After commutation course starts, the IGCT D1 of conducting controlling brancher, now the first capacitive branch is shorted, but due to the
Conducting voltage Vce that voltage is IGBT at two electric capacity C2 two ends, therefore the second electric capacity C2 does not still have electric current to flow through.
3, cutout work
After cutout process starts, turning off IGBT7, now the voltage at IGBT two ends drastically raises, and this voltage passes through controlling brancher
It is charged to the second electric capacity C2.Now, fault current is successively from disconnecting switch 1, current-limiting inductance 2, IGCT D1 and second
Electric capacity C2 flows through, and can obtain according to circuit theory, when resistance on branch roadTime, the electric current on circuit will shake
Swing.Vibration makes current amplitude constantly raise, and the charging current showing as the second electric capacity constantly says rising, after being finally reached peak value
Drop to zero.Replica current cannot be passed through due to IGCT D1 afterwards, so the ground Ah cattle on Gai Zhi road is zero, now can turn off
IGCT D1.
When the charging current of the second electric capacity is during peak-fall is zero, and the voltage at the second electric capacity two ends the most constantly raises,
Conducting spark gap eventually so that short circuit current is consumed by spark gap, and final short circuit energy is consumed complete.
After spark gap runs out of short circuit energy, the second electric capacity is discharged by the second resistance of discharge paths.Now, first
The voltage at electric capacity and the second electric capacity two ends is redistributed, and final allocation result is: the voltage at the first electric capacity C1 two ends is from crystalline substance
Conducting voltage 0.7V of brake tube D1 rises to the voltage at IGBT two ends, and the voltage at the second electric capacity C2 two ends progressively decreases to zero,
Now capacitance voltage redistribute complete you.Auxiliary circuit enters pre-conducting state, buffers for shutoff next time and prepares.
Finally should be noted that: described embodiment is only some embodiments of the present application rather than whole embodiments.
Based on the embodiment in the application, those of ordinary skill in the art obtained under not making creative work premise all its
His embodiment, broadly falls into the scope of the application protection.
Claims (9)
1. high short circuit turn off a dc circuit breaker auxiliary circuit, described dc circuit breaker include parallel connection energy absorption units and
Series valve section；Described energy absorption units is composed in parallel by least two spark gap, and described series valve section is by least two electric power electricity
Sub-devices in series forms；It is characterized in that, described auxiliary circuit is connected in parallel on power electronic devices two ends；
Described auxiliary circuit includes the first capacitive branch, the second capacitive branch, controlling brancher and discharge paths；
Described first capacitive branch and controlling brancher form the first parallel units, described second capacitive branch and discharge paths composition the
Two parallel units；This first parallel units and the series connection of the second parallel units.
2. a kind of high short circuit as claimed in claim 1 turns off dc circuit breaker auxiliary circuit, it is characterised in that described first
The positive pole of capacitive branch is connected with the colelctor electrode of power electronic devices, the negative pole of the second capacitive branch and the transmitting of power electronic devices
Pole connects.
3. a kind of high short circuit as claimed in claim 1 turns off dc circuit breaker auxiliary circuit, it is characterised in that
Described first capacitive branch is made up of the first electric capacity and the first resistant series；
Described second capacitive branch includes the second electric capacity, and the capacitance of described second electric capacity is more than the capacitance of the first electric capacity.
4. a kind of high short circuit as claimed in claim 1 turns off dc circuit breaker auxiliary circuit, it is characterised in that
Described controlling brancher includes IGCT, and the ON time scope of this IGCT is described power electronic devices changes beginning to turn on
Stream and the time period turned off between cutout.
5. a kind of high short circuit as claimed in claim 1 turns off dc circuit breaker auxiliary circuit, it is characterised in that
Described discharge paths includes the second resistance；
The computing formula of resistance R of described second resistance is:
R=τ/C
Wherein, τ is the capacitor discharge time constant of described second capacitive branch, and C is the capacitance of described second capacitive branch.
6. a control method based on auxiliary circuit as described in claim 1-5, it is characterised in that described method includes:
Step 1: gather the electric current of power electronic devices colelctor electrode, it is judged that whether power electronic devices turns on；
Step 2: at the IGCT of the ON time internal trigger control branch road of power electronic devices；
Step 3: gather the charging current of the second capacitive branch, when this charging current electric current is zero by peak-fall, turns off institute
State IGCT.
7. the control method of auxiliary circuit as claimed in claim 6, it is characterised in that described ON time is 2ms.
8. the control method of auxiliary circuit as claimed in claim 6, it is characterised in that when the second capacitive branch in described step 3
Charging current be zero by peak-fall during, the conducting of the spark gap of energy absorption units, high voltage short circuit electric current flows through described
Spark gap consumes.
9. the control method of auxiliary circuit as claimed in claim 8, it is characterised in that
After described high voltage short circuit electric current is discharged by spark gap, the second capacitive branch is discharged by discharge paths；
When after described second capacitive branch discharge off, the magnitude of voltage that magnitude of voltage is power electronic devices two ends at the first electric capacity two ends,
The magnitude of voltage at the second electric capacity two ends is zero.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610371352.7A CN106024497B (en) | 2016-05-30 | 2016-05-30 | Auxiliary circuit for high-short-circuit turn-off direct-current circuit breaker and control method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610371352.7A CN106024497B (en) | 2016-05-30 | 2016-05-30 | Auxiliary circuit for high-short-circuit turn-off direct-current circuit breaker and control method thereof |
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Cited By (5)
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| CN108717909A (en) * | 2018-06-28 | 2018-10-30 | 河南森源电气股份有限公司 | A kind of dc circuit breaker for low-voltage direct |
| CN109361204A (en) * | 2018-09-16 | 2019-02-19 | 王雪燕 | A kind of arc-extinction device and method can be used for power grid AC and DC breaker |
| CN112703675A (en) * | 2018-09-18 | 2021-04-23 | 西门子股份公司 | Switching device for breaking a current path |
| CN113179011A (en) * | 2021-05-17 | 2021-07-27 | 阳光储能技术有限公司 | Power supply circuit, control method thereof, capacitor discharge circuit and power conversion circuit |
| WO2023011768A1 (en) * | 2021-08-04 | 2023-02-09 | Vitesco Technologies GmbH | Circuit breaker unit |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108717909A (en) * | 2018-06-28 | 2018-10-30 | 河南森源电气股份有限公司 | A kind of dc circuit breaker for low-voltage direct |
| CN109361204A (en) * | 2018-09-16 | 2019-02-19 | 王雪燕 | A kind of arc-extinction device and method can be used for power grid AC and DC breaker |
| CN112703675A (en) * | 2018-09-18 | 2021-04-23 | 西门子股份公司 | Switching device for breaking a current path |
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| WO2023011768A1 (en) * | 2021-08-04 | 2023-02-09 | Vitesco Technologies GmbH | Circuit breaker unit |
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