CN104377695B - A kind of compensator with series capaci tance, power delivery circuit and the method for suppressing TRV - Google Patents
A kind of compensator with series capaci tance, power delivery circuit and the method for suppressing TRV Download PDFInfo
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- CN104377695B CN104377695B CN201410669879.9A CN201410669879A CN104377695B CN 104377695 B CN104377695 B CN 104377695B CN 201410669879 A CN201410669879 A CN 201410669879A CN 104377695 B CN104377695 B CN 104377695B
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- breaker
- line
- compensator
- capaci tance
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
-
- 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
- H02H9/08—Limitation or suppression of earth fault currents, e.g. Petersen coil
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/002—Flicker reduction, e.g. compensation of flicker introduced by non-linear load
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The present invention relates to electrotechnics and electronics field, discloses a kind of compensator with series capaci tance, power delivery circuit and the method for suppressing TRV, and the compensator with series capaci tance includes：Capacitor；Metal oxide pressure-limiting device, capacitor form the first parallel units with metal oxide pressure-limiting device；Spark gap；High-speed switch, spark gap form the second parallel units with high-speed switch；Damping unit, damping unit are series between the first parallel units and the second parallel units, to reach the TRV technique effects caused by suppression compensator with series capaci tance comprehensively.
Description
Technical field
The present invention relates to electrotechnics and electronics field, more particularly to a kind of compensator with series capaci tance, power delivery circuit and
Suppress TRV (transient recovery voltage：Transient recovery voltage) method.
Background technology
In ultra-high-tension power transmission line, the cut-out of electric current is realized by primary cut-out.During circuitry cuts, breaker (arc)
The contact time of releasing can produce electric arc, and electric current continues to circulate in circuit, electric arc blow-out in current over-zero.After blow-out, open circuit
The recovery voltage with transient state characteristic occurs between device (arc) contact, referred to as TRV, is power frequency recovery voltage after TRV.Its
If middle TRV amplitude or steepness are too high, more than the dielectric strength between contact, electric arc will be restriked, and circuit is formed and impacted, shadow
The service life of equipment is rung, some equipment can be made when serious because of overvoltage or overcurrent damage.
Using series capacitor compensation (referred to as：String mend) technology can improve super-pressure, extra-high voltage long-distance transmission line it is defeated
Electric energy power and the stability of a system, and there is certain adjustment effect to the trend distribution on passway for transmitting electricity.Using controlled series compensation skill
Art may also suppress system low frequency power oscillation and optimization system load flow distribution.As shown in figure 1, it is a compensator with series capaci tance
Structure chart, it is specifically included：
Capacitor 10；
Metal oxide pressure-limiting device 11 (can be MOV (Metal Oxide Varistor)：The pressure-sensitive electricity of metal oxide
Resistance, or MOA (Metal Oxide Arrester)：Metal oxide arrester)) 11, metal oxide pressure-limiting device 11 is electric capacity
The main protection of device 10.When there is larger fault current on the line in compensator with series capaci tance, will appear from capacitor 10 compared with
High overvoltage, metal oxide pressure-limiting device 11 can utilize the strong nonlinearity characteristic of its own voltage-electric current by capacitor 10
Voltage is limited in below design load, so that it is guaranteed that the safe operation of capacitor 10.
Spark gap 12, spark gap 12 are used to provide back-up protection for metal oxide pressure-limiting device 11 and capacitor 10,
Absorbed when the electric current that metal oxide pressure-limiting device 11 is shared more than its starting current setting valve or metal oxide pressure-limiting device 11
Energy, which exceedes its startups, to be taken, and control system understands pilot spark gap 12, so bypass metal oxide pressure-limiting device 11 and
Capacitor 10.
Bypass breaker 13, bypass breaker 13 be system overhaul and scheduling necessary device, compensator with series capaci tance
Control system while pilot spark gap 12 order bypass breaker 13, for gap arc extinguishing and go free to provide necessary bar
Part；
Damping unit 14, damping unit 14 can limiting capacitance device 10 discharge current, prevent capacitor 10, spark gap
12nd, bypass breaker 13 is damaged in discharge process.
From the point of view of existing research, the use of compensator with series capaci tance generally improves its place ultra-high-tension power transmission line
TRV, pass through open circuit after line single phase grounding failure, three-phase shortcircuit, line to line fault and line to line fault earth fault where being mended to string
Device TRV research, TRV increase rates are up to 15%~20%.In the prior art, can in several ways under certain condition
Suppress TRV, such as：
(1) by fast linked bypass breaker suppress TRV, if but trouble point is farther out in the program, flow through string mend
Short circuit current is smaller, gap may due to voltage is low and the breakdown that can not link, breaker TRV now are horizontal with not taking linkage
It is identical during measure, i.e., still may be exceeded.
(2) TRV is suppressed by installing metal oxide pressure-limiting device additional to line-breaker fracture, but in practice, the program
The effect and unobvious played, and the energy consumption that the metal oxide pressure-limiting device of line-breaker fracture absorbs may be very big,
It is likely to cause the damage of metal oxide pressure-limiting device.
(3) by give line-breaker install additional sub-gate resistance suppress TRV, but sub-gate resistance generally only for series compensation degrees not
High occasion uses, and when series compensation degrees are higher, TRV is it is possible to exceeded.
(4) in transmission line of electricity both ends dispersed placement compensator with series capaci tance, but for the feelings of high series compensatnig degree, such as 70%
Shape, TRV is it is possible to exceeded.
The content of the invention
The present invention provides a kind of compensator with series capaci tance, power delivery circuit and the method for suppressing TRV, to solve prior art
In can not suppress the too high technical problem of TRV caused by compensator with series capaci tance comprehensively.
In a first aspect, the embodiment of the present invention provides a kind of compensator with series capaci tance, including：
Capacitor；
Metal oxide pressure-limiting device, the capacitor form the first parallel units with the metal oxide pressure-limiting device；
Spark gap；
High-speed switch, the spark gap form the second parallel units with the high-speed switch；
Damping unit, the damping unit are series between first parallel units and second parallel units.
Optionally, the high-speed switch is specially：The line-breaker of circuit where the compensator with series capaci tance
Cut-off operation and start rear and first opening between phase contact before arc extinction in the line-breaker, can complete to close opens
Close, wherein the line-breaker performed in closing of receiving that relay protection system sends after order described in cut-off operation.
Optionally, the high-speed switch is specially：Can be complete before phase contact separates in first opening for the line-breaker
Into the switch closed.
Optionally, the first parameter value and the second parameter value sum are less than the most short switch off time or most of the line-breaker
Short opening time, first parameter value are specially：The time in the loop that the damping unit is formed with the capacitor is normal
5 times of several values, second parameter value are specially：The high-speed switch closes the time.
Optionally, the high-speed switch is specially：Solid-state switch based on power electronic devices or based on electromagnetic repulsion force machine
The mechanical switch of structure.
Second aspect, the embodiment of the present invention provide a kind of power delivery circuit, including：
First power supply；
First impedance, it is connected to first power supply；
First line breaker, it is connected to first impedance；
First compensator with series capaci tance, it is connected to the first line breaker, the first series capacitor compensation dress
It is set to the compensator with series capaci tance that first aspect present invention any embodiment is introduced；
Transmission line of electricity, it is connected to first compensator with series capaci tance；
Second line-breaker, it is connected to the transmission line of electricity；
Second impedance, it is connected to second line-breaker；
Second source, it is connected to second impedance.
Optionally, the power delivery circuit also includes：
Second compensator with series capaci tance, it is connected between the transmission line of electricity and second line-breaker, it is described
The compensator with series capaci tance that second compensator with series capaci tance is introduced by first aspect any embodiment.
3rd fermentation, the embodiment of the present invention provide a kind of method that transient suppression recovers voltage, applied to the present invention second
In the power delivery circuit that aspect any embodiment is introduced, methods described includes：
What reception relay protection system was sent closes order and cut-offs order, wherein, the relay protection system is detecting
When being broken down to the power delivery circuit, while close order described in generation and cut-off order；
Order is closed described in response, controls the high-speed switch to perform and closes operation；
Order is cut-off described in response, cut-offs operation described in the execution of control circuit breaker, the line-breaker is specially
The first line breaker and second line-breaker.
Optionally, cut-offfing after operation starts and touch in first opening for the line-breaker in the line-breaker
When a length of first duration between head between the arc extinction moment；
The time that closes of the high-speed switch is the second duration, and second duration is less than first duration.
Optionally, cut-offfing after operation starts and touch in first opening for the line-breaker in the line-breaker
When a length of 3rd duration between the head separation moment, the 3rd duration are less than first duration.
The present invention has the beneficial effect that：
In embodiments of the present invention, there is provided a kind of compensator with series capaci tance, including：Capacitor；Metal oxide limits
Depressor, capacitor form the first parallel units with metal oxide pressure-limiting device；Spark gap；High-speed switch, spark gap with it is fast
Speed switch forms the second parallel units；Damping unit, damping unit are series between the first parallel units and the second parallel units.
Because the closing speed of high-speed switch is upper more many soon than the closing speed of existing bypass breaker, and after high-speed switch closes,
Whole compensator with series capaci tance is short-circuited, so, for the line-breaker of ultra-high-tension power transmission line its cut-off operation with
The conventional circuit without connection compensator with series capaci tance cut-off operation be it is the same, can be defeated by high pressure so as to reach
The TRV when line-breaker of electric line cut-offs is suppressed to horizontal technique effect during no compensator with series capaci tance, and
And because compensator with series capaci tance does not influence on the TRV of ultra-high-tension power transmission line, so any operating condition can be fitted
With without protection's dead-zone, and then the TRV caused by compensator with series capaci tance can be suppressed comprehensively；
Also, install metal oxide pressure-limiting device additional or to line broken circuit in line-breaker fracture with of the prior art
The method that device installs sub-gate resistance additional is compared, and the present invention is not required to increase the design and manufacture difficulty of line-breaker, it is only necessary to online
Both can be with using conventional line-breaker in road；
Also, compared with the method for dispersed placement compensator with series capaci tance in the prior art, the present invention need not increase
The construction of land seizure area and compensator with series capaci tance and operating cost；
Also, bypass breaker only need to be replaced with high-speed switch i.e. by the present invention in existing compensator with series capaci tance
Can, it is not necessary to big change, design and build and be simple and easy.
Brief description of the drawings
Fig. 1 is the structure chart of compensator with series capaci tance in the prior art；
Fig. 2 is the structure chart of compensator with series capaci tance in the embodiment of the present invention；
Fig. 3 a are the first structure chart of the high-speed switch in compensator with series capaci tance of the embodiment of the present invention；
Fig. 3 b are second of structure chart of the high-speed switch in compensator with series capaci tance of the embodiment of the present invention；
Fig. 4 is the third structure chart of the high-speed switch in compensator with series capaci tance of the embodiment of the present invention；
Fig. 5 is the structure chart of power delivery circuit in the embodiment of the present invention；
Fig. 6 is the improved structure figure of power delivery circuit in the embodiment of the present invention；
Fig. 7 is the flow chart for the method for suppressing TRV in the embodiment of the present invention.
Embodiment
The present invention provides a kind of compensator with series capaci tance, power delivery circuit and the method for suppressing TRV, to solve prior art
In can not suppress the too high technical problem of TRV caused by compensator with series capaci tance comprehensively.
General thought of the embodiment of the present invention is as follows：
In embodiments of the present invention, there is provided a kind of compensator with series capaci tance, including：Capacitor；Metal oxide limits
Depressor, capacitor form the first parallel units with metal oxide pressure-limiting device；Spark gap；High-speed switch, spark gap with it is fast
Speed switch forms the second parallel units；Damping unit, damping unit are series between the first parallel units and the second parallel units.
Because the closing speed of high-speed switch is upper more many soon than the closing speed of bypass breaker, and after high-speed switch closes, entirely
Compensator with series capaci tance is short-circuited, and so, it cut-offs operation and routine for the line-breaker of ultra-high-tension power transmission line
No compensator with series capaci tance circuit cut-off operation be it is the same, can be by ultra-high-tension power transmission line so as to reach
TRV when line-breaker cut-offs is suppressed to horizontal technique effect during no compensator with series capaci tance, and due to string
Connection Electric capacity compensation device does not influence on the TRV of ultra-high-tension power transmission line, so can be applicable any operating condition, does not protect
Dead band is protected, and then the TRV caused by compensator with series capaci tance can be suppressed comprehensively；
Also, install metal oxide pressure-limiting device or to line broken circuit in breaker fracture with circuit of the prior art
The method that device installs sub-gate resistance additional is compared, and the present invention is not required to increase the design and manufacture difficulty of line-breaker, it is only necessary to online
Both can be with using conventional line-breaker in road；
Also, compared with the method for dispersed placement compensator with series capaci tance in the prior art, the present invention need not increase
The construction of land seizure area and compensator with series capaci tance and operating cost；
Also, bypass breaker only need to be replaced with high-speed switch i.e. by the present invention in existing compensator with series capaci tance
Can, it is not necessary to big change, design and build and be simple and easy.
In order to be better understood from above-mentioned technical proposal, below by accompanying drawing and specific embodiment to technical solution of the present invention
It is described in detail, it should be understood that the specific features in the embodiment of the present invention and embodiment are to the detailed of technical solution of the present invention
Thin explanation, rather than the restriction to technical solution of the present invention, in the case where not conflicting, the embodiment of the present invention and embodiment
In technical characteristic can be mutually combined.
The embodiment of the present invention provides a kind of compensator with series capaci tance, refer to Fig. 2, specifically includes：
Capacitor 20；
Metal oxide pressure-limiting device 21, capacitor 20 form the first parallel units with metal oxide pressure-limiting device 21；Wherein,
Metal oxide pressure-limiting device 21 is, for example,：MOV(Metal Oxide Varistor：Metal oxide piezo-resistance), MOA
(Metal Oxide Arrester：Metal oxide arrester) etc., metal oxide pressure-limiting device 21 is that capacitor 20 provides
Main protection, when compensator with series capaci tance larger fault current occurs on the line, it will appear from capacitor 20 higher
Overvoltage, metal oxide pressure-limiting device 21 can utilize the strong nonlinearity characteristic of its own voltage-electric current by the voltage of capacitor 20
It is limited in below design load, so that it is guaranteed that the safe operation of capacitor 20；
Spark gap 22, spark gap 22 are that metal oxide pressure-limiting device 21 and capacitor 20 provide back-up protection, work as gold
The electric current that category oxide voltage limiter 21 is shared exceedes the energy that its starting current setting valve or metal oxide pressure-limiting device 21 absorb
It can be taken more than its startup, control system meeting pilot spark gap 22, bypass metal oxide pressure-limiting device 21 and capacitor 20.
High-speed switch 23, spark gap 22 form the second parallel units, the first parallel units and second with high-speed switch 23
Parallel units are connected；
Damping unit 24, damping unit 24 are series between the first parallel units and the second parallel units, damping unit 24
Can limiting capacitance device 20 discharge current, prevent that capacitor 20, spark gap 22, high-speed switch 23 from being damaged in discharge process
It is bad.
As further preferred embodiment, high-speed switch 23 is specially：The circuit where compensator with series capaci tance
Line-breaker cut-offs operation and starts rear and first opening between phase contact before arc extinction in line-breaker, can complete to close
The switch of conjunction, wherein, line-breaker closes to perform after order and cut-offs operation receive that relay protection system sends.
In specific implementation process, when line-breaker includes arcing contact, line-breaker first opens what phase contact referred to
It is to first open phase arcing contact.
In such a case, it is possible to ensure TRV of the circuit after arc extinction and the line without compensator with series capaci tance
Road is identical.
As further preferred embodiment, high-speed switch 23 is specially：The separation of phase contact is first opened in line-breaker
The switch closed can be completed before.
In such a case, it is possible to ensure TRV processes when line-breaker cut-offs after arc process and arc extinction all
It is the same with the situation without compensator with series capaci tance, and then further reduces the requirement to line-breaker performance.
Two kinds of high-speed switches for meeting above-mentioned requirements 23 are explained below, certainly, are not limited in specific implementation process
Following two situations.
The first, high-speed switch 23 is specially：Solid-state switch based on power electronic devices, under normal circumstances solid-state switch
Cut-offfing and closing operation for us levels can be realized, basic constituted mode there are two kinds：One kind is parallel connection type (as shown in Figure 3 a), another
Kind is tandem type (as shown in Figure 3 b).The primary element of use can be GTO (Gate Turn-Off Thyristor：Gate leve can
Cutoff thyristor), IGBT (Insulated Gate Bipolar Transistor：Insulated gate bipolar IGCT), IGCT,
Using the high-speed switch formed by two GTO reverse parallel connections in the large-capacity power electronic device such as diode, wherein Fig. 3 a
Quickly opened by what the IGBT elementary cell differential concatenations that forms in parallel with diode reverse was formed using two in 23, Fig. 3 b
Close 23.
In specific implementation process, for the application scenario of different voltages or electric current, above-mentioned primary element can be used
Connect to improve voltage endurance capability, through-current capability is improved using the parallel connection of above-mentioned primary element, while to take corresponding measure to protect
Voltage and electric current are evenly distributed on unit in operation for card.
Second, high-speed switch 23 is specially：Mechanical switch based on electromagnetic repulsion mechanism.
As shown in figure 4, the schematic diagram of the operating mechanism for a high-speed switch based on electromagnetic repulsion mechanism, its operation principle
It is：Discharged by the capacitor of precharge to switching winding 40 or closing coil 41, pulse current produced by coil discharge,
In the presence of the pulse current, the magnetic field of alternation is produced around coil, and (metal dish 42 can be electric conductivity in metal dish 42
Various metals that can be good) on produce vortex, magnetic field caused by vortex and magnetic field interaction caused by coil, so as to the company of drive
Bar 43 is moved, and moving contact is connected with connecting rod 43, and then drives moving contact to realize cut-offfing or closing for switch by connecting rod 43.
As further preferred embodiment, the first parameter value is less than the most short of line-breaker with the second parameter value sum
Switch off time or most short opening time, the first parameter value are specially：The loop that damping unit 24 and capacitor 20 are formed when
Between 5 times of constant values, the second parameter value is specially：High-speed switch 23 closes the time.
In specific implementation process, after high-speed switch 23 closes, damping unit 24 and 20 groups of composition loops of capacitor, this time
Road has time constant, be can consider in engineering after 3~5 times of time constant, and the energy release in loop finishes.Setting
Will be according to the most short switch off time or opening time of line-breaker (due to separating brake phase and line broken circuit during meter damping unit 24
Device acts the reason for dispersiveness in itself, and each switch off time of line-breaker and opening time are probably different.) and series connection
The size of capacitor 20 determines the value of the element such as resistance, inductance in damping unit 24 in Electric capacity compensation device so that loop
5 times of values of time constant close most short switch off time of the time sum less than line-breaker or most short separating brake with high-speed switch
Time, in this case, first opening between phase contact before arc extinction in line-breaker can be ensured, pass through damping unit
Realize that electric charge discharges completely on capacitor 20, and then make whole compensator with series capaci tance by thorough short circuit, so that further
Reduce the TRV caused by compensator with series capaci tance.
Second aspect, based on same inventive concept, the embodiment of the present invention provides a kind of power delivery circuit, refer to Fig. 5, specifically
Including：
First power supply 50；
First impedance 51, it is connected to the first power supply 50；
First line breaker 52, it is connected to the first impedance 51；
First compensator with series capaci tance 53, is connected to the first line breaker 52, and first series capacitance is mended
Repay the compensator with series capaci tance that device 53 is introduced by first aspect present invention any embodiment；
Transmission line of electricity 54, it is connected to first compensator with series capaci tance 53；
Second line-breaker 55, is connected to transmission line of electricity 54；
Second impedance 56, it is connected to the second line-breaker 55；
Second source 57, it is connected to the second impedance 56.
As further preferred embodiment, Fig. 6 is refer to, power delivery circuit also includes：
Second compensator with series capaci tance 58, it is connected between the line-breaker 55 of transmission line of electricity 54 and second, the second string
The compensator with series capaci tance that any embodiment of the connection first aspect present invention of Electric capacity compensation device 58 is introduced, in such case
Under, the second line-breaker 55 is connected to transmission line of electricity 54 by the second compensator with series capaci tance 58.
The power delivery circuit can be improved by the first compensator with series capaci tance 53 or the second compensator with series capaci tance 58
Long-distance transmission line ability to transmit electricity and the stability of a system, and on passway for transmitting electricity trend distribution there is certain regulation
Effect, while when the line-breaker 55 of first line breaker 52 and second cut-offs, due to the first compensator with series capaci tance
53 or second high-speed switch 23 employed in compensator with series capaci tance 58 close speed, so mend series capacitance
Repaying device can quickly be short-circuited, and then cut-offfing for the line-breaker 55 of first line breaker 52 and second is operated and routine
The circuit without connection compensator with series capaci tance to cut-off operation identical, so compensator with series capaci tance institute can be suppressed
Caused TRV.
The third aspect, based on same inventive concept, the embodiment of the present invention provides a kind of suppression TRV method, and its feature exists
In in the power delivery circuit applied to any embodiment introduction of the present invention, refer to Fig. 7, method includes：
Step S701：What reception relay protection system was sent closes order and cut-offs order, wherein, relay protection system exists
When detecting that power delivery circuit breaks down, while generation closes order and cut-offs order.
Step S702：Response closes order, and control high-speed switch 23, which performs, closes operation；
Under normal circumstances, what relay protection system was sent closes order and cut-offs operational control system of the order than power delivery circuit
The priority of control instruction caused by system will height, so high-speed switch 23 is just immediately performed after receiving and closing order
Operation is closed, meanwhile, the electric charge on capacitor 20 is discharged completely by damping unit 24 so that line-breaker (namely：The
One line-breaker 52 and the second line-breaker 55) what is actually accomplished is cut-offfing for conventional line failure, so as to limit TRV
Level.
Wherein, operation control system mainly controls breaker operator in the case of the non-faulting such as system debug or maintenance,
Complete the operation such as system debug, switching of the method for operation.
Step S703：Order is cut-off in response, cut-offs operation described in the execution of control circuit breaker, line-breaker is specially
The line-breaker 55 of first line breaker 52 and second, the same line-breaker 56 of first line breaker 52 and second are connecing
Receive after cut-offfing order, can also be immediately performed and cut-off operation.
Optionally, line-breaker cut-off operation start after and line-breaker first open phase contact between electric arc put out
When a length of first duration to go out between the moment；
The time that closes of high-speed switch 23 is the second duration, and the second duration is less than the first duration.
Optionally, cut-offfing after operation starts and in line-breaker when first opening the separation of phase contact in line-breaker
Between at the time of a length of 3rd duration, the 3rd duration is less than the first duration.
The one or more embodiments of the present invention, at least have the advantages that：
In embodiments of the present invention, in embodiments of the present invention, there is provided a kind of compensator with series capaci tance, including：Electricity
Container；Metal oxide pressure-limiting device, capacitor form the first parallel units with metal oxide pressure-limiting device；Spark gap；Quickly
Switch, spark gap form the second parallel units with high-speed switch；Damping unit, damping unit be series at the first parallel units and
Between second parallel units.Because the closing speed of high-speed switch is upper more many soon than the closing speed of bypass breaker, and fast
After speed closes, whole compensator with series capaci tance is short-circuited, so, for the line-breaker of ultra-high-tension power transmission line
Its cut-off operation and the circuit of conventional no compensator with series capaci tance cut-off operation be it is the same, can so as to reach
The TRV when line-breaker of ultra-high-tension power transmission line is cut-off is suppressed to horizontal technology during no compensator with series capaci tance
Effect, and because compensator with series capaci tance does not influence on the TRV of ultra-high-tension power transmission line, so to any operating condition all
It can be applicable, without protection's dead-zone, and then the TRV caused by compensator with series capaci tance can be suppressed comprehensively；
Also, install metal oxide pressure-limiting device or to line broken circuit in line-breaker fracture with of the prior art
The method that device installs sub-gate resistance additional is compared, and the present invention is not required to increase the design and manufacture difficulty of line-breaker, it is only necessary to online
Both can be with using conventional line-breaker in road；
Also, compared with the method for dispersed placement compensator with series capaci tance in the prior art, the present invention need not increase
The construction of land seizure and compensator with series capaci tance and operating cost.
Also, bypass breaker only need to be replaced with fast quick-break switch by the present invention in existing compensator with series capaci tance
, it is not necessary to big change, design and build and be simple and easy.
Although preferred embodiments of the present invention have been described, but those skilled in the art once know basic creation
Property concept, then can make other change and modification to these embodiments.So appended claims be intended to be construed to include it is excellent
Select embodiment and fall into having altered and changing for the scope of the invention.
Obviously, those skilled in the art can carry out the essence of various changes and modification without departing from the present invention to the present invention
God and scope.So, if these modifications and variations of the present invention belong to the scope of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to comprising including these changes and modification.
Claims (7)
- A kind of 1. compensator with series capaci tance, it is characterised in that including：Capacitor；Metal oxide pressure-limiting device, the capacitor form the first parallel units with the metal oxide pressure-limiting device；Spark gap；High-speed switch, the spark gap form the second parallel units with the high-speed switch, and the high-speed switch is specially： The line-breaker of circuit cut-offs operation and started afterwards and in the head of the line-breaker where the compensator with series capaci tance Open between phase contact before arc extinction, the switch closed can be completed, wherein, the line-breaker is receiving relay protection Operation is cut-off described in being performed after order that what system was sent close；The high-speed switch is that the machinery based on electromagnetic repulsion mechanism is opened Close or the solid-state switch based on power electronic devices, the solid-state switch include：Quickly opened by what two GTO reverse parallel connections were formed Close, or by two high-speed switches formed by the IGBT elementary cell differential concatenations that forms in parallel with diode reverse；Damping unit, the damping unit are series between first parallel units and second parallel units；Wherein, the first parameter value and the second parameter value sum are less than the most short switch off time of the line-breaker or most short separating brake Time, first parameter value are specially：5 times of the time constant in the loop that the damping unit is formed with the capacitor Value, second parameter value are specially：The high-speed switch closes the time.
- 2. compensator with series capaci tance as claimed in claim 1, it is characterised in that the high-speed switch is specially：Described Line-breaker first opens the switch that can complete to close before phase contact separates.
- A kind of 3. power delivery circuit, it is characterised in that including：First power supply；First impedance, it is connected to first power supply；First line breaker, it is connected to first impedance；First compensator with series capaci tance, is connected to the first line breaker, and first compensator with series capaci tance is Any described compensator with series capaci tance of claim 1-2；Transmission line of electricity, it is connected to first compensator with series capaci tance；Second line-breaker, it is connected to the transmission line of electricity；Second impedance, it is connected to second line-breaker；Second source, it is connected to second impedance.
- 4. power delivery circuit as claimed in claim 3, it is characterised in that the power delivery circuit also includes：Second compensator with series capaci tance, it is connected between the transmission line of electricity and second line-breaker, described second Compensator with series capaci tance is any described compensator with series capaci tance of claim 1-2.
- 5. a kind of method that transient suppression recovers voltage, it is characterised in that applied in the power delivery circuit described in claim 3, Methods described includes：What reception relay protection system was sent closes order and cut-offs order, wherein, the relay protection system is detecting When stating power delivery circuit failure, while close order described in generation and cut-off order；Order is closed described in response, controls the high-speed switch to perform and closes operation；Order is cut-off described in response, operation is cut-off described in the execution of control circuit breaker, the line-breaker is specially described First line breaker and second line-breaker.
- 6. method as claimed in claim 5, it is characterised in that the line-breaker cut-off after operation starts and When a length of first duration first opened between phase contact between the arc extinction moment of the line-breaker；The time that closes of the high-speed switch is the second duration, and second duration is less than first duration.
- 7. method as claimed in claim 6, it is characterised in that the line-breaker cut-off after operation starts and When a length of 3rd duration first opened between the phase contact separation moment of the line-breaker, the 3rd duration are less than described the One duration.
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| CN105182040B (en) * | 2015-09-01 | 2018-01-09 | 中国西电电气股份有限公司 | A kind of computational methods for being used for TRV reference voltages under Nonsymmetric Short Circuit fault condition |
| CN105977933B (en) * | 2016-06-17 | 2020-04-14 | 中国电力科学研究院 | Method for selecting fixed value of series compensation overvoltage protection action in consideration of probability distribution |
| CN106877356A (en) * | 2017-03-31 | 2017-06-20 | 国家电网公司 | A kind of low-power consumption 10kV compensator with series capaci tance |
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| CN201656456U (en) * | 2010-03-12 | 2010-11-24 | 华东电力试验研究院有限公司 | Supergrid short-circuit current limiting device |
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| CN102170116B (en) * | 2010-02-26 | 2015-03-18 | 华东电力试验研究院有限公司 | Real-time digital simulation system of fault current limiter |
| CN103078306B (en) * | 2013-01-09 | 2015-01-21 | 中国科学院电工研究所 | Fault current limiter on basis of combined rapid switch-on switch |
| CN203039369U (en) * | 2013-01-11 | 2013-07-03 | 山西省电力公司大同供电分公司 | Controllable series compensation device for inhibiting subsynchronous resonance of system in power transmission line |
| CN203761046U (en) * | 2014-03-28 | 2014-08-06 | 华北电力大学 | Controllable series compensation system |
| CN104158183B (en) * | 2014-08-18 | 2016-09-21 | 国家电网公司 | A kind of serial connection capacitor compensating device using the parallel damping reactor of flat bed |
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| CN201656456U (en) * | 2010-03-12 | 2010-11-24 | 华东电力试验研究院有限公司 | Supergrid short-circuit current limiting device |
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