CN107039953A - A kind of shutting-brake control method of high voltage DC breaker - Google Patents
A kind of shutting-brake control method of high voltage DC breaker Download PDFInfo
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- CN107039953A CN107039953A CN201710286020.3A CN201710286020A CN107039953A CN 107039953 A CN107039953 A CN 107039953A CN 201710286020 A CN201710286020 A CN 201710286020A CN 107039953 A CN107039953 A CN 107039953A
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- Prior art keywords
- disjunction
- branch road
- unit
- closure
- breaker
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Classifications
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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
- H02H7/261—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 involving signal transmission between at least two stations
- H02H7/262—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 involving signal transmission between at least two stations involving transmissions of switching or blocking orders
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
- H02H3/087—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current for dc applications
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- Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
Abstract
The present invention proposes a kind of shutting-brake control method of high voltage DC breaker, and methods described closes the disjunction unit of disjunction branch road, then closes on-state branch road, last disjunction disjunction branch road by group first.By group in the disjunction unit process of closure disjunction branch road, judge whether transmission system breaks down after the disconnected unit of closure present component.If do not break down, continue to close the disconnected unit of next component, operated up to being further continued for next step after the disconnected unit of all components all closure；If break down, the disjunction unit that all groups of disjunction has been closed, and terminate closing operation.Precharge in high voltage DC breaker making process to transmission system can be realized by the above method, overvoltage and system oscillation that reduction closing operation is produced.
Description
Technical field
The present invention relates to a kind of shutting-brake control method of high voltage DC breaker, belong to breaker technical field.
Background technology
Flexible DC power transmission uses voltage source converter, can independently, quickly control active power and reactive power, from
And improve the stability of system, the fluctuation of suppression system frequency and voltage, the steady-state behaviour for improving synchronization AC system.With change
The increasingly depleted of the stone energy and the increasingly increase for improving environmental pressure, China or even the world are faced with the strategic of energy resource structure
Adjustment, large-scale development and utilization new energy are imperative.
As flexible DC power transmission develops toward higher voltage and more Large Copacity, flexible DC power transmission is transmitted electricity applied to overhead line
The objective requirement that China's energy resources are distributed rationally is realized, is also the future trend of electric power network technique development.Because overhead line occurs
The probability of failure is higher, and the reason such as thunderbolt may cause the over-voltage breakdown of overhead line structures etc., occur DC line instantaneity short
Road failure.Flexible direct current power transmission system quickly isolates failure by configuring high voltage DC breaker, how quick recovery system
The problem of operation is urgent need to resolve in engineer applied.Direct coincidence high voltage DC breaker sky fills DC line and overvoltage occurs
With system oscillation problem.Arranged in series is connected in parallel outside high voltage DC breaker resistance and by-pass switch, can be to circuit
Enter line precharge to reduce the overvoltage of closing operation generation, but adds additional place and cost.
The content of the invention
The purpose of the present invention, is a kind of shutting-brake control method for providing high voltage DC breaker, by closing by group point
The disjunction unit of disconnected branch road, the nonlinear resistance via the disjunction unit in disjunction state makes transmission system steadily charge, from
And effectively reduce overvoltage caused by closing operation and system oscillation, it is ensured that the reliable and secure operation of transmission system.
In order to reach above-mentioned purpose, the technical solution adopted by the present invention is：
A kind of shutting-brake control method of high voltage DC breaker, the high voltage DC breaker includes what is be connected in parallel with each other
On-state branch road and disjunction branch road, the on-state branch road include mechanical switch and the on-state valve group being serially connected, the disjunction branch road
Including the disjunction unit that at least one is connected in series with each other, the disjunction unit includes the disjunction valve group being connected in parallel with each other and non-
Linear resistance；The shutting-brake control method of the high voltage DC breaker closes disjunction branch road first, then closes on-state branch road, most
Disjunction disjunction branch road afterwards；
The closure disjunction branch road is the disjunction unit in closure disjunction branch road by group, and the unit that breaks per component includes at least one
Individual disjunction unit.
In the disjunction unit process of the disjunction branch road of closure by group, pass through the non-of the disjunction unit in disjunction state
Linear resistance charges to transmission system.
Further, the disjunction unit that disjunction branch road is closed by group, its every group of quantity and its closing order are by transmitting electricity
The horizontal U of system overvoltagemaxAllow maximum time T with closing a floodgatemaxDetermine；After any one group of input, meet surge voltage and be not more than
Twice of transmission system overvoltage level Umax；The combined floodgate that all groups of whole making times are not more than engine request allows maximum time
Tmax。
Further, in the disjunction unit process in the disjunction branch road of closure by group, the disconnected unit of closure present component
Judge whether transmission system breaks down afterwards；If not breaking down, continue to close the disconnected unit of next component, until all components break
Unit is further continued for next step operation after all closing；If break down, the disjunction unit that all groups of disjunction has been closed, and tie
Beam closing operation.
Further, the transmission system failure, including line fault, change of current station failure and dc circuit breaker failure.
Further, the closure disjunction branch road is the semiconductor switch device of disjunction valve group in unblock disjunction unit, is divided
Disconnected disjunction branch road is the semiconductor switch device of disjunction valve group in locking disjunction unit.
Further, the closure on-state branch road is closure mechanical switch and closure on-state valve group.
Further, every group of quantity and closing order can be preset, can also line computation determine with it is existing
Technology is compared, and the beneficial effect that the present invention is reached is：
1) line precharge is entered to transmission system using the nonlinear resistance in disjunction branch road, is effectively saved cost and occupation of land
Area.At present, prior art, such as flexible direct current transmission converter valve (VSC), THE UPFC (UPFC), static reacance hair
The devices such as raw device (SVG), are realized by additionally increasing charging resistor and by-pass switch.
2) nonlinear resistance is made full use of, under system constraints, the disjunction unit in disjunction branch road is closed by group, from
And eliminate impulse overvoltage caused by closing operation and system oscillation, eliminate therefore to the negative of system other visual plants generation
Influence, greatly promotes the stability and reliability of whole system operation.
Brief description of the drawings
Fig. 1 is the flow chart of the shutting-brake control method for the high voltage DC breaker that the present invention is provided.
Fig. 2 is the topological basic structure of high voltage DC breaker.
Fig. 3 is the equivalent circuit diagram that DC transmission system configures high voltage DC breaker.
Fig. 4 is that (pu is DC line electricity in figure for voltage waveform under the shutting-brake control method of current high voltage DC breaker
Press perunit value).
Fig. 5 is that (pu is direct current in figure for voltage waveform under the high voltage DC breaker shutting-brake control method that provides of the present invention
Line voltage distribution perunit value).
Embodiment
The invention will be further described below in conjunction with the accompanying drawings.Following examples are only used for clearly illustrating the present invention
Technical scheme, and can not be limited the scope of the invention with this.
Accompanying drawing 2 show high voltage DC breaker Basic Topological, including on-state branch road (1) and disjunction branch road (2), leads to
State branch road (1) and disjunction branch road (2) are connected in parallel with each other.On-state branch road includes mechanical switch and the on-state valve group being connected in series,
Mechanical switch can be that a switch or multiple switch are connected in series.Disjunction branch road includes at least one set of disjunction list being connected in series
Member, disjunction unit includes disjunction valve group and the nonlinear resistance being connected in parallel with each other.
It is the equivalent circuit diagram that DC transmission system configures high voltage DC breaker, DC converter station output shown in accompanying drawing 3
Connect high voltage DC breaker, high voltage DC breaker output connection transmission line of electricity, inductance and capacitor equivalent used for transmission line.Us
Represent high voltage DC breaker current conversion station side voltage-to-ground, UbRepresent high voltage DC breaker both end voltage, UlRepresent HVDC
Breaker line side voltage-to-ground, UrRepresent circuit distal end voltage.
The shutting-brake control method of high voltage DC breaker is at present：Disjunction branch road is closed, on-state branch road is then closed, finally
Disjunction disjunction branch road.It is the voltage waveform under current high voltage DC breaker shutting-brake control method shown in accompanying drawing 4.T is closed
Disjunction branch road, i.e., the disjunction unit of all disjunction branch roads is all closed, high voltage DC breaker both end voltage UbMoment is reduced to zero,
High voltage DC breaker line side voltage-to-ground UlWith current conversion station side voltage-to-ground UsMoment is equal, and voltage step change will draw
Initial line great distance terminal voltage UrIntense oscillations, higher overvoltage and vibration has adverse effect on to system operation, as circuit is kept away
The action of thunder device, current conversion station locking etc..
The shutting-brake control method of the high voltage DC breaker of the present invention, closes the disjunction unit of disjunction branch road by group first,
Then on-state branch road, last disjunction disjunction branch road are closed.
In the disjunction unit process of closure disjunction branch road by group, pass through the non-linear of the disjunction unit in disjunction state
Resistance charges to transmission system.In practical engineering application, nonlinear resistance can be Zinc-Oxide Arrester.
The disjunction unit of disjunction branch road is closed by group, and its every group of quantity and its closing order are by transmission system overvoltage level
UmaxAllow maximum time T with closing a floodgatemaxDetermine；After any one group of input, meet surge voltage and be not more than twice of transmission system mistake
Voltage level Umax；The combined floodgate that all groups of whole making times are not more than engine request allows maximum time Tmax。
In disjunction unit process in closure disjunction branch road by group, transmission system is judged after the disconnected unit of closure present component
Whether break down, transmission system failure includes line fault, change of current station failure and dc circuit breaker failure.If event does not occur
Barrier, continuation closes the disconnected unit of next component, and being further continued for next step after unit whole closure until all components break operates.If occurring
During failure, then the disjunction unit that all groups of disjunction has been closed, and terminate closing operation.
Be shown in accompanying drawing 5 high voltage DC breaker of the present invention shutting-brake control method under voltage waveform.Closed a floodgate from t
Operation starts, as first group, second group, the 3rd group, the ... component are broken the closure by group of unit, high voltage DC breaker two ends
Voltage UbSlow reduction, high voltage DC breaker line side voltage UlIt is slow to rise, so that circuit distal end voltage UrOn slow
Rise, effectively prevent overvoltage caused by closing operation and system oscillation.
The high voltage DC breaker that contains ten disjunction units below with a disjunction branch road further illustrates the present invention
The shutting-brake control method embodiment of high voltage DC breaker.
Disjunction unit in disjunction branch road is grouped and sequencing numbers so that surge voltage and closing time are satisfied by
It is required that.Packet and sequence have a variety of executable combinations, such as：
1) it is divided into two groups：First group contain five disjunction units, second group contain five disjunction units；First group contains six
Individual disjunction unit, second group contain four disjunction units；……
2) it is divided into three groups：First group contain five disjunction units, second group contain three disjunction units, the 3rd group contain two
Individual disjunction unit；First group contain five disjunction units, second group contain two disjunction units, the 3rd group contain three disjunction lists
Member；……
3) it is divided into four groups：First group contain five disjunction units, second group contain three disjunction units, the 3rd group contain one
Individual disjunction unit, the 4th group contain a disjunction unit；First group contain three disjunction units, second group contain a disjunction list
Member, the 3rd group contain a disjunction unit, the 4th group contain five disjunction units；……
4) it is divided into five groups：First group contain five disjunction units, second group contain two disjunction units, the 3rd group contain one
Individual disjunction unit, the 4th group contain a disjunction unit, the 5th group contain a disjunction unit；First group contains a disjunction list
Member, second group contain a disjunction unit, the 3rd group contain a disjunction unit, the 4th group contain two disjunction units, five
Group contains five disjunction units；……
5) it is divided into six groups：……
6) it is divided into seven groups：……
7) it is divided into eight groups：……
8) it is divided into nine groups：……
9) it is divided into ten groups：……
By system emulation or theoretical calculation can draw packet and sequencing numbers scheme whether meet surge voltage and
Closing time requirement.
It is one of flow chart embodiment of shutting-brake control method of high voltage DC breaker of the present invention shown in accompanying drawing 1, specifically
Step is as follows：
Step 1：Receive after closing operation order, initial value 1 is assigned to group number N.
Step 2：The disconnected unit (N=1,2,3 ...) of N components is closed, that is, unlocks partly leading for the disconnected unit disjunction valve group of N components
Body switching device.N components are broken after unit closure, and the nonlinear resistance of the disjunction unit of non-disjunction enters low resistance state, to transmission of electricity
System charges.
Step 3：Judge whether circuit breaks down.N components are broken after unit closure, are stayed and are had time to judge transmission system
Whether break down, such as line fault, change of current station failure or high voltage DC breaker failure.Enter step if breaking down
(7), high voltage DC breaker, which closes a floodgate, fails；Enter step (4) if circuit does not break down, perform next step operation.
Step 4：N=N+1, the next component of readiness for closing is broken unit.
Step 5：Judge whether disjunction unit all closes.All closure then enters step (6), otherwise into step (2).
Step 6：Close on-state branch road.Disjunction unit all after closure, closes the mechanical switch and on-state valve of on-state branch road
Group.
Step 7：All disjunction units of disjunction disjunction branch road, high voltage DC breaker closing success.
Step 8：Closing operation terminates.
In above-mentioned implementation steps, the disjunction unit of disjunction branch road is grouped and the implementation of sequencing numbers can also be improved to
Numbering is not performed.
Described above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, without departing from the technical principles of the invention, some improvement and deformation can also be made, these improve and deformed
Also it should be regarded as protection scope of the present invention.
Claims (7)
1. a kind of shutting-brake control method of high voltage DC breaker, the high voltage DC breaker is logical including what is be connected in parallel with each other
State branch road and disjunction branch road, the on-state branch road include mechanical switch and the on-state valve group being serially connected, the disjunction branch road bag
At least one disjunction unit is included, or including multiple disjunction units being connected in series with each other, the disjunction unit is included mutually simultaneously
Join the disjunction valve group and nonlinear resistance of connection；The shutting-brake control method of the high voltage DC breaker closes disjunction branch first
Road, then closes on-state branch road, last disjunction disjunction branch road；It is characterized in that：
The mode of the closure disjunction branch road is the disjunction unit in closure disjunction branch road by group；
In the disjunction unit process of the disjunction branch road of closure by group, pass through the non-linear of the disjunction unit in disjunction state
Resistance is pre-charged to transmission system.
2. the shutting-brake control method of high voltage DC breaker according to claim 1, it is characterised in that：
When disjunction branch road includes multiple disjunction units, during the disjunction unit of the disjunction branch road of closure by group,
The quantity and its closing order of disjunction unit are by transmission system overvoltage level UmaxAllow maximum time T with closing a floodgatemaxCertainly
It is fixed；
After any disjunction one group of input of unit, surge voltage is less than or equal to twice of transmission system overvoltage level voltage Umax；
The combined floodgate that the whole making times of all disjunction units are less than or equal to engine request allows maximum time Tmax。
3. the shutting-brake control method of high voltage DC breaker according to claim 1, it is characterised in that：
In disjunction unit process in the disjunction branch road of closure by group, transmission system is judged after the disconnected unit of closure present component
Whether break down；
If not breaking down, continue to close the disconnected unit of next component, be further continued for down up to after the disconnected unit of all components all closure
Single stepping；
If breaking down, the disjunction unit that all groups of disjunction has been closed, and terminate closing operation.
4. according to the shutting-brake control method of any described high voltage DC breaker in claim 1-3, it is characterised in that：
The transmission system failure, including line fault, change of current station failure and dc circuit breaker failure.
5. according to the shutting-brake control method of any described high voltage DC breaker in claim 1-3, it is characterised in that：
The closure disjunction branch road is the semiconductor switch device of disjunction valve group in unblock disjunction unit, and disjunction disjunction branch road is to close
Lock the semiconductor switch device of disjunction valve group in disjunction unit.
6. the shutting-brake control method of high voltage DC breaker according to claim 1, it is characterised in that：The closure on-state
Branch road is closure mechanical switch and closure on-state valve group.
7. the shutting-brake control method of high voltage DC breaker according to claim 1, it is characterised in that：The disjunction unit
Quantity and closing order preset, or, by being determined in line computation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710286020.3A CN107039953A (en) | 2017-04-27 | 2017-04-27 | A kind of shutting-brake control method of high voltage DC breaker |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710286020.3A CN107039953A (en) | 2017-04-27 | 2017-04-27 | A kind of shutting-brake control method of high voltage DC breaker |
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| CN107039953A true CN107039953A (en) | 2017-08-11 |
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| CN201710286020.3A Pending CN107039953A (en) | 2017-04-27 | 2017-04-27 | A kind of shutting-brake control method of high voltage DC breaker |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107565506A (en) * | 2017-08-21 | 2018-01-09 | 全球能源互联网研究院有限公司 | A kind of dc circuit breaker reclosing control method and device |
| CN108471132A (en) * | 2018-03-29 | 2018-08-31 | 西安许继电力电子技术有限公司 | A kind of current conversion station carries out the startup method of DC side charging by dc circuit breaker |
-
2017
- 2017-04-27 CN CN201710286020.3A patent/CN107039953A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107565506A (en) * | 2017-08-21 | 2018-01-09 | 全球能源互联网研究院有限公司 | A kind of dc circuit breaker reclosing control method and device |
| WO2019037728A1 (en) * | 2017-08-21 | 2019-02-28 | 全球能源互联网研究院有限公司 | Reclosing controlling method and apparatus for direct-current circuit breaker, and storage medium |
| CN108471132A (en) * | 2018-03-29 | 2018-08-31 | 西安许继电力电子技术有限公司 | A kind of current conversion station carries out the startup method of DC side charging by dc circuit breaker |
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Application publication date: 20170811 |
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