CN104377695A - Series capacitor compensation device, power transmission circuit and TRV suppressing method - Google Patents
Series capacitor compensation device, power transmission circuit and TRV suppressing method Download PDFInfo
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- CN104377695A CN104377695A CN201410669879.9A CN201410669879A CN104377695A CN 104377695 A CN104377695 A CN 104377695A CN 201410669879 A CN201410669879 A CN 201410669879A CN 104377695 A CN104377695 A CN 104377695A
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- 239000003990 capacitor Substances 0.000 title claims abstract description 42
- 238000000034 method Methods 0.000 title claims abstract description 35
- 230000005540 biological transmission Effects 0.000 title claims abstract description 26
- 229910044991 metal oxide Inorganic materials 0.000 claims abstract description 42
- 238000013016 damping Methods 0.000 claims abstract description 25
- 150000004706 metal oxides Chemical class 0.000 claims description 40
- 230000004224 protection Effects 0.000 claims description 17
- 230000008033 biological extinction Effects 0.000 claims description 9
- 230000001629 suppression Effects 0.000 claims description 7
- 238000011084 recovery Methods 0.000 claims description 6
- 230000004044 response Effects 0.000 claims description 6
- 230000007246 mechanism Effects 0.000 claims description 5
- 230000001052 transient effect Effects 0.000 claims description 5
- 230000000694 effects Effects 0.000 abstract description 6
- 230000008569 process Effects 0.000 description 9
- 238000013461 design Methods 0.000 description 8
- 230000008859 change Effects 0.000 description 6
- 230000005611 electricity Effects 0.000 description 6
- 230000008901 benefit Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 238000009826 distribution Methods 0.000 description 3
- 238000010891 electric arc Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
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- 238000012986 modification Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 241000931705 Cicada Species 0.000 description 1
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- 238000000855 fermentation Methods 0.000 description 1
- 230000004151 fermentation Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
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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
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- 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
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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
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
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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
- 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 invention relates to the technical field of electrical and electronic engineering, and discloses a series capacitor compensation device, a power transmission circuit and a TRV suppressing method. The series capacitor compensation device comprises a capacitor, a metallic oxide voltage limiter, a spark gap, a high-speed switch and a damping device, wherein a first parallel connection unit is formed by the capacitor and the metallic oxide voltage limiter, and a second parallel connection unit is formed by the spark gap and the rapid switch; the damping device is connected between the first parallel connection unit and the second parallel connection unit in series so that the technical effect of comprehensively suppressing the TRV caused by the series capacitor compensation device can be achieved.
Description
Technical field
The present invention relates to electrotechnics and electronics field, particularly relate to a kind of method of compensator with series capaci tance, power delivery circuit and suppression TRV (transient recovery voltage: transient recovery voltage).
Background technology
In ultra-high-tension power transmission line, the cut-out of electric current is realized by primary cut-out.In circuitry cuts process, the time of releasing of circuit breaker (arc) contact can produce electric arc, and in circuit, electric current continues circulation, electric arc blow-out when current over-zero.After blow-out, there will be the recovery voltage with transient state characteristic, be called TRV between circuit breaker (arc) contact, be power frequency recovery voltage after TRV.If wherein the amplitude of TRV or steepness too high, exceed the dielectric strength between contact, electric arc will be restriked, and forms and impacts, affect the useful life of equipment, some equipment can be made time serious because of overvoltage or overcurrent damage circuit.
Adopt series capacitor compensation (be called for short: string mend) technology can improve superhigh pressure, the ability to transmit electricity of ultra high voltage long-distance transmission line and the stability of a system, and to the trend distribution on passway for transmitting electricity, there is certain regulating action.Adopt controlled series compensation technology also can suppress system low frequency power oscillation and the distribution of optimization system trend.As shown in Figure 1, be the structure chart of a compensator with series capaci tance, it specifically comprises:
Capacitor 10;
Metal oxide pressure-limiting device 11 (can be MOV (Metal Oxide Varistor): metal oxide piezo-resistance; or MOA (Metal Oxide Arrester): metal oxide arrester)) 11, metal oxide pressure-limiting device 11 is main protections of capacitor 10.Compensator with series capaci tance occur on the line comparatively major break down electric current time, higher overvoltage will be there is in capacitor 10, metal oxide pressure-limiting device 11 can utilize the strong nonlinearity characteristic of himself electricity Ya – electric current that the voltage of capacitor 10 is limited in below design load, thus guarantees the safe operation of capacitor 10.
Spark gap 12; spark gap 12 is for providing backup protection for metal oxide pressure-limiting device 11 and capacitor 10; the electric current shared when metal oxide pressure-limiting device 11 exceed energy that its starting current setting value or metal oxide pressure-limiting device 11 absorb exceed that it starts can be consuming time; control system meeting pilot spark gap 12, and then bypass metal oxide pressure-limiting device 11 and capacitor 10.
Bypass breaker 13, bypass breaker 13 is necessary devices of system overhaul and scheduling, control system order bypass breaker 13 while pilot spark gap 12 of compensator with series capaci tance, for gap arc extinguishing and go free to provide necessary condition;
Damping device 14, damping device 14 can the discharging current of limiting capacitance device 10, prevents capacitor 10, spark gap 12, bypass breaker 13 damaged in discharge process.
From existing research, the use of compensator with series capaci tance generally improves the TRV of its place ultra-high-tension power transmission line, by the research to circuit breaker TRV after string benefit place line single phase grounding failure, three-phase shortcircuit, line to line fault and line to line fault earth fault, TRV increase rate can reach 15% ~ 20%.In prior art, TRV can be suppressed under certain condition in several ways, such as:
(1) TRV is suppressed by fast linked bypass breaker, if but in the program, fault point is comparatively far away, and the short circuit current flowing through string benefit is less, may cannot link because voltage is low and puncture in gap, circuit breaker TRV level is now identical with when not taking interlock measure, namely still may exceed standard.
(2) TRV is suppressed by installing metal oxide pressure-limiting device additional to line-breaker fracture, but in reality, the effect that the program plays is also not obvious, and the energy consumption that the metal oxide pressure-limiting device of line-breaker fracture absorbs may be very large, likely causes the damage of metal oxide pressure-limiting device.
(3) by installing sub-gate resistance suppression TRV additional to line-breaker, but sub-gate resistance only uses for the occasion that string benefit degree is not high usually, and when string benefit degree is higher, TRV still likely exceeds standard.
(4) at transmission line two ends dispersed placement compensator with series capaci tance, but for high series compensatnig degree, as the situation of 70%, TRV still likely exceeds standard.
Summary of the invention
The invention provides a kind of method of compensator with series capaci tance, power delivery circuit and suppression TRV, to solve the too high technical problem of the TRV that cannot compensator with series capaci tance be suppressed to cause in prior art comprehensively.
First aspect, the embodiment of the present invention provides a kind of compensator with series capaci tance, comprising:
Capacitor;
Metal oxide pressure-limiting device, described capacitor and described metal oxide pressure-limiting device form the first parallel units;
Spark gap;
High-speed switch, described spark gap and described high-speed switch form the second parallel units;
Damping device, described damping device is series between described first parallel units and described second parallel units.
Optionally; described high-speed switch is specially: the line-breaker of described compensator with series capaci tance place circuit cut-off operation start after and to first open between phase contact before arc extinction at described line-breaker; the switch closed can be completed, wherein said line-breaker receive that relaying protection system sends close order after perform described in cut-off operation.
Optionally, described high-speed switch is specially: can complete first opening before phase contact is separated of described line-breaker the switch closed.
Optionally, first parameter value and the second parameter value sum are less than the shortest switch off time of described line-breaker or the shortest opening time, described first parameter value is specially: 5 times of values of the time constant in the loop that described damping device and described capacitor are formed, and described second parameter value is specially: described high-speed switch close the time.
Optionally, described high-speed switch is specially: based on the solid-state switch of power electronic device or the mechanical switch based on electromagnetic repulsion force mechanism.
Second aspect, the embodiment of the present invention provides a kind of power delivery circuit, comprising:
First power supply;
First impedance, is connected to described first power supply;
First line circuit breaker, is connected to described first impedance;
First compensator with series capaci tance, is connected to described first line circuit breaker, the compensator with series capaci tance that described first compensator with series capaci tance is introduced for first aspect present invention any embodiment;
Transmission line, is connected to described first compensator with series capaci tance;
Second line-breaker, is connected to described transmission line;
Second impedance, is connected to described second line-breaker;
Second source, is connected to described second impedance.
Optionally, described power delivery circuit also comprises:
Second compensator with series capaci tance, is connected between described transmission line and described second line-breaker, the compensator with series capaci tance that described second compensator with series capaci tance is introduced for first aspect any embodiment.
3rd fermentation, the embodiment of the present invention provides a kind of method of transient suppression recovery voltage, and be applied in the power delivery circuit that second aspect present invention any embodiment introduces, described method comprises:
What reception relaying protection system sent closes order and cut-offs order, and wherein, described relaying protection system, when detecting that described power delivery circuit breaks down, closes order and cut-offs order described in producing simultaneously;
Close order described in response, control described high-speed switch and perform pass closing operation;
Cut-off order described in response, cut-off operation described in control circuit circuit breaker performs, described line-breaker is specially described first line circuit breaker and described second line-breaker.
Optionally, described line-breaker cut-off operation start after and be the first duration at the duration first opened between phase contact between the arc extinction moment of described line-breaker;
The time that closes of described high-speed switch is the second duration, and described second duration is less than described first duration.
Optionally, described line-breaker cut-off operation start after and described line-breaker to first open the duration that phase contact is separated between the moment be the 3rd duration, described 3rd duration is less than described first duration.
Beneficial effect of the present invention is as follows:
In embodiments of the present invention, provide a kind of compensator with series capaci tance, comprising: capacitor; Metal oxide pressure-limiting device, capacitor and metal oxide pressure-limiting device form the first parallel units; Spark gap; High-speed switch, spark gap and high-speed switch form the second parallel units; Damping device, damping device is series between the first parallel units and the second parallel units.Because the closing speed of high-speed switch is gone up many than the closing speed of existing bypass breaker soon, and after high-speed switch closes, whole compensator with series capaci tance is shorted, like this, for ultra-high-tension power transmission line line-breaker its cut-off operation and routine do not connect the circuit of compensator with series capaci tance cut-off that to operate be the same, thus the TRV reached when the line-breaker of ultra-high-tension power transmission line can be cut-off is suppressed to the technique effect of level when not having compensator with series capaci tance, and because the TRV of compensator with series capaci tance on ultra-high-tension power transmission line does not affect, so can both be suitable for any operating condition, there is no protection's dead-zone, and then the TRV that can comprehensively suppress compensator with series capaci tance to cause,
And, install metal oxide pressure-limiting device with of the prior art additional at line-breaker fracture or install additional to line-breaker compared with the method for sub-gate resistance, the present invention does not need the Design and manufacture difficulty increasing line-breaker, only needs to use conventional line-breaker both passable in the line;
Further, compared with the method for dispersed placement compensator with series capaci tance in prior art, the present invention does not need the construction and the operating cost that increase land seizure area and compensator with series capaci tance;
Further, bypass breaker only need be replaced with high-speed switch by the present invention in existing compensator with series capaci tance, does not need large change, designs and build simple.
Accompanying drawing explanation
Fig. 1 is the structure chart of compensator with series capaci tance in prior art;
Fig. 2 is the structure chart of compensator with series capaci tance in the embodiment of the present invention;
Fig. 3 a is the first structure chart of the high-speed switch in embodiment of the present invention compensator with series capaci tance;
Fig. 3 b is the second structure chart of the high-speed switch in embodiment of the present invention compensator with series capaci tance;
Fig. 4 is the third structure chart of the high-speed switch in embodiment of the present invention compensator with series capaci tance;
Fig. 5 is the structure chart of power delivery circuit in the embodiment of the present invention;
Fig. 6 is the modified node method figure of power delivery circuit in the embodiment of the present invention;
Fig. 7 is the flow chart of the method suppressing TRV in the embodiment of the present invention.
Embodiment
The invention provides a kind of method of compensator with series capaci tance, power delivery circuit and suppression TRV, to solve the too high technical problem of the TRV that cannot compensator with series capaci tance be suppressed to cause in prior art comprehensively.
Embodiment of the present invention general thought is as follows:
In embodiments of the present invention, provide a kind of compensator with series capaci tance, comprising: capacitor; Metal oxide pressure-limiting device, capacitor and metal oxide pressure-limiting device form the first parallel units; Spark gap; High-speed switch, spark gap and high-speed switch form the second parallel units; Damping device, damping device is series between the first parallel units and the second parallel units.Because the closing speed of high-speed switch is gone up many than the closing speed of bypass breaker soon, and after high-speed switch closes, whole compensator with series capaci tance is shorted, like this, for ultra-high-tension power transmission line line-breaker its cut-off operation and routine there is no a circuit of compensator with series capaci tance cut-off that to operate be the same, thus the TRV reached when the line-breaker of ultra-high-tension power transmission line can be cut-off is suppressed to the technique effect of level when not having compensator with series capaci tance, and because the TRV of compensator with series capaci tance on ultra-high-tension power transmission line does not affect, so can both be suitable for any operating condition, there is no protection's dead-zone, and then the TRV that can comprehensively suppress compensator with series capaci tance to cause,
And, install metal oxide pressure-limiting device with circuit of the prior art at breaker fracture or install additional to line-breaker compared with the method for sub-gate resistance, the present invention does not need the Design and manufacture difficulty increasing line-breaker, only needs to use conventional line-breaker both passable in the line;
Further, compared with the method for dispersed placement compensator with series capaci tance in prior art, the present invention does not need the construction and the operating cost that increase land seizure area and compensator with series capaci tance;
Further, bypass breaker only need be replaced with high-speed switch by the present invention in existing compensator with series capaci tance, does not need large change, designs and build simple.
In order to better understand technique scheme, below by accompanying drawing and specific embodiment, technical solution of the present invention is described in detail, the specific features being to be understood that in the embodiment of the present invention and embodiment is the detailed description to technical solution of the present invention, instead of the restriction to technical solution of the present invention, when not conflicting, the technical characteristic in the embodiment of the present invention and embodiment can combine mutually.
The embodiment of the present invention provides a kind of compensator with series capaci tance, please refer to Fig. 2, specifically comprises:
Capacitor 20;
Metal oxide pressure-limiting device 21, capacitor 20 and metal oxide pressure-limiting device 21 form the first parallel units, wherein, metal oxide pressure-limiting device 21 is such as: MOV (Metal Oxide Varistor: metal oxide piezo-resistance), MOA (Metal Oxide Arrester: metal oxide arrester) etc., metal oxide pressure-limiting device 21 provides main protection for capacitor 20, compensator with series capaci tance occur on the line comparatively major break down electric current time, higher overvoltage will be there is in capacitor 20, metal oxide pressure-limiting device 21 can utilize the strong nonlinearity characteristic of himself electricity Ya – electric current that the voltage of capacitor 20 is limited in below design load, thus guarantee the safe operation of capacitor 20,
Spark gap 22; spark gap 22 provides backup protection for metal oxide pressure-limiting device 21 and capacitor 20; the electric current shared when metal oxide pressure-limiting device 21 exceed energy that its starting current setting value or metal oxide pressure-limiting device 21 absorb exceed that it starts can be consuming time; control system meeting pilot spark gap 22, bypasses metal oxide pressure-limiting device 21 and capacitor 20.
High-speed switch 23, spark gap 22 and high-speed switch 23 form the second parallel units, the first parallel units and the series connection of the second parallel units;
Damping device 24, damping device 24 is series between the first parallel units and the second parallel units, and damping device 24 can the discharging current of limiting capacitance device 20, prevents capacitor 20, spark gap 22, high-speed switch 23 damaged in discharge process.
As further preferred embodiment; high-speed switch 23 is specially: the line-breaker of compensator with series capaci tance place circuit cut-off operation start after and to first open between phase contact before arc extinction at line-breaker; the switch closed can be completed; wherein, line-breaker receive that relaying protection system sends close order after perform and cut-off operation.
In specific implementation process, when line-breaker comprises arcing contact, the phase contact that first opens of line-breaker refers to and first opens phase arcing contact.
In this case, can ensure that the TRV of circuit after arc extinction is identical with not having the circuit of compensator with series capaci tance.
As further preferred embodiment, high-speed switch 23 is specially: can complete first opening before phase contact is separated of line-breaker the switch closed.
In this case, TRV process when can ensure that line-breaker cut-offs after arc process and arc extinction is all the same with the situation without compensator with series capaci tance, and then further reduces the requirement to line-breaker performance.
To the high-speed switch 23 that two kinds meet above-mentioned requirements be introduced below, certainly, in specific implementation process, be not limited to following two kinds of situations.
The first, high-speed switch 23 is specially: based on the solid-state switch of power electronic device, solid-state switch can realize cut-offfing and pass closing operation of us level under normal circumstances, basic comprising mode has two kinds: one is parallel connection type (as shown in Figure 3 a), and another kind is tandem type (as shown in Figure 3 b).The primary element adopted can be the large-capacity power electronic device such as GTO (Gate Turn-Off Thyristor: gate leve turn-off thyristor), IGBT (Insulated GateBipolar Transistor: insulated gate bipolar thyristor), thyristor, diode, what wherein adopt in Fig. 3 a is that what to adopt in high-speed switch 23, Fig. 3 b formed by two GTO reverse parallel connections is two high-speed switches 23 formed by the IGBT elementary cell differential concatenation formed in parallel with diode reverse.
In specific implementation process, for the application scenario of different voltage or electric current, the series connection of above-mentioned primary element can be adopted to improve voltage endurance capability, adopt the parallel connection of above-mentioned primary element to improve through-current capability, corresponding measure will be taked simultaneously to ensure to be in operation being evenly distributed of voltage and electric current on unit.
The second, high-speed switch 23 is specially: based on the mechanical switch of electromagnetic repulsion force mechanism.
As shown in Figure 4, be one based on the schematic diagram of the operating mechanism of the high-speed switch of electromagnetic repulsion force mechanism, its operation principle is: discharged to switching winding 40 or closing coil 41 by pre-charged capacitor, pulse current is produced by coil discharge, under the effect of this pulse current, the magnetic field of alternation is produced around coil, and eddy current is produced on metal dish 42 (the various metals that metal dish 42 can be good for electric conductivity), the magnetic field that eddy current produces and the magnetic field interaction that coil produces, thus drivening rod 43 moves, and connecting rod 43 is connected with moving contact, and then drive moving contact realize cut-offfing of switch or close by connecting rod 43.
As further preferred embodiment, first parameter value and the second parameter value sum are less than the shortest switch off time of line-breaker or the shortest opening time, first parameter value is specially: 5 times of values of the time constant in the loop that damping device 24 and capacitor 20 are formed, and the second parameter value is specially: high-speed switch 23 close the time.
In specific implementation process, after high-speed switch 23 closes, damping device 24 and 20 groups, capacitor form loop, and this loop has time constant, engineering can be thought, after the time constant of 3 ~ 5 times, the fault offset in loop is complete.When designing damping device 24 will according to the shortest switch off time of line-breaker or opening time (due to separating brake phase place and the action of line-breaker own dispersed, the switch off time that line-breaker is each and opening time may be different.) and compensator with series capaci tance in the size of capacitor 20 determine resistance in damping device 24, the value of the elements such as inductance, the time that the closes sum of 5 of loop time constant times of values and high-speed switch is made to be less than the shortest switch off time of line-breaker or the shortest opening time, in this case, can ensure to first open between phase contact before arc extinction at line-breaker, realize electric charge on capacitor 20 by damping device to discharge completely, and then make whole compensator with series capaci tance by thorough short circuit, thus the further TRV reducing compensator with series capaci tance and cause.
Second aspect, based on same inventive concept, the embodiment of the present invention provides a kind of power delivery circuit, please refer to Fig. 5, specifically comprises:
First power supply 50;
First impedance 51, is connected to the first power supply 50;
First line circuit breaker 52, is connected to the first impedance 51;
First compensator with series capaci tance 53, is connected to described first line circuit breaker 52, the compensator with series capaci tance that described first compensator with series capaci tance 53 is introduced for first aspect present invention any embodiment;
Transmission line 54, is connected to described first compensator with series capaci tance 53;
Second line-breaker 55, is connected to transmission line 54;
Second impedance 56, is connected to the second line-breaker 55;
Second source 57, is connected to the second impedance 56.
As further preferred embodiment, please refer to Fig. 6, power delivery circuit also comprises:
Second compensator with series capaci tance 58, be connected between transmission line 54 and the second line-breaker 55, the compensator with series capaci tance that any embodiment of the second compensator with series capaci tance 58 first aspect present invention is introduced, in this case, the second line-breaker 55 is connected to transmission line 54 by the second compensator with series capaci tance 58.
Ability to transmit electricity and the stability of a system of the long-distance transmission line of this power delivery circuit can be improved by the first compensator with series capaci tance 53 or the second compensator with series capaci tance 58, and to the trend distribution on passway for transmitting electricity, there is certain regulating action, simultaneously when first line circuit breaker 52 and the second line-breaker 55 cut-off, speed is closed due to the high-speed switch 23 that adopts in the first compensator with series capaci tance 53 or the second compensator with series capaci tance 58, so enable compensator with series capaci tance be shorted fast, and then make first line circuit breaker 52 and the second line-breaker 55 cut-off operation and routine be not connected the circuit of compensator with series capaci tance cut-off operate identical, so the TRV that compensator with series capaci tance causes can be suppressed.
The third aspect, based on same inventive concept, the embodiment of the present invention provides a kind of method suppressing TRV, it is characterized in that, be applied in the power delivery circuit of any embodiment of the present invention introduction, please refer to Fig. 7, method comprises:
Step S701: what reception relaying protection system sent closes order and cut-off order, wherein, relaying protection system, when detecting that power delivery circuit breaks down, produces simultaneously and closes order and cut-off order.
Step S702: response closes order, controls high-speed switch 23 and performs pass closing operation;
Under normal circumstances; what relaying protection system sent close order and it is high to cut-off the priority of the control command that order produces than the operation control system of power delivery circuit; so high-speed switch 23 is after receiving and closing order; just perform immediately and close closing operation; simultaneously; by damping device 24 by the electric charge release on capacitor 20 completely; making line-breaker (also namely: first line circuit breaker 52 and the second line-breaker 55), actual what complete is cut-offfing of conventional line fault, thus limits the level of TRV.
The operations such as wherein, operation control system mainly controls breaker operator in the non-faulting such as system debug or maintenance situation, the switching of completion system debugging, operational mode.
Step S703: order is cut-off in response, control circuit circuit breaker cut-offs operation described in performing, line-breaker is specially first line circuit breaker 52 and the second line-breaker 55, same first line circuit breaker 52 and the second line-breaker 56, after receiving and cut-offfing order, also can perform immediately and cut-off operation.
Optionally, line-breaker cut-off operation start after and the duration first opened between phase contact between the arc extinction moment of line-breaker is the first duration;
The time that closes of high-speed switch 23 is the second duration, and the second duration is less than the first duration.
Optionally, line-breaker cut-off operation start after and line-breaker first open phase contact be separated time between moment length be the 3rd duration, the 3rd duration is less than the first duration.
The one or more embodiment of the present invention, at least has following beneficial effect:
In embodiments of the present invention, in embodiments of the present invention, provide a kind of compensator with series capaci tance, comprising: capacitor; Metal oxide pressure-limiting device, capacitor and metal oxide pressure-limiting device form the first parallel units; Spark gap; High-speed switch, spark gap and high-speed switch form the second parallel units; Damping device, damping device is series between the first parallel units and the second parallel units.Because the closing speed of high-speed switch is gone up many than the closing speed of bypass breaker soon, and after high-speed switch closes, whole compensator with series capaci tance is shorted, like this, for ultra-high-tension power transmission line line-breaker its cut-off operation and routine there is no a circuit of compensator with series capaci tance cut-off that to operate be the same, thus the TRV reached when the line-breaker of ultra-high-tension power transmission line can be cut-off is suppressed to the technique effect of level when not having compensator with series capaci tance, and because the TRV of compensator with series capaci tance on ultra-high-tension power transmission line does not affect, so can both be suitable for any operating condition, there is no protection's dead-zone, and then the TRV that can comprehensively suppress compensator with series capaci tance to cause,
And, install metal oxide pressure-limiting device with of the prior art at line-breaker fracture or install additional to line-breaker compared with the method for sub-gate resistance, the present invention does not need the Design and manufacture difficulty increasing line-breaker, only needs to use conventional line-breaker both passable in the line;
Further, compared with the method for dispersed placement compensator with series capaci tance in prior art, the present invention does not need the construction and the operating cost that increase land seizure and compensator with series capaci tance.
Further, bypass breaker only need be replaced with fast quick-break switch by the present invention in existing compensator with series capaci tance, does not need large change, designs and build simple.
Although describe the preferred embodiments of the present invention, those skilled in the art once obtain the basic creative concept of cicada, then can make other change and amendment to these embodiments.So claims are intended to be interpreted as comprising preferred embodiment and falling into all changes and the amendment of the scope of the invention.
Obviously, those skilled in the art can carry out various change and modification to the present invention and not depart from the spirit and scope of the present invention.Like this, if these amendments of the present invention and modification belong within the scope of the claims in the present invention and equivalent technologies thereof, then the present invention is also intended to comprise these change and modification.
Claims (10)
1. a compensator with series capaci tance, is characterized in that, comprising:
Capacitor;
Metal oxide pressure-limiting device, described capacitor and described metal oxide pressure-limiting device form the first parallel units;
Spark gap;
High-speed switch, described spark gap and described high-speed switch form the second parallel units;
Damping device, described damping device is series between described first parallel units and described second parallel units.
2. compensator with series capaci tance as claimed in claim 1; it is characterized in that; described high-speed switch is specially: the line-breaker of described compensator with series capaci tance place circuit cut-off operation start after and to first open between phase contact before arc extinction at described line-breaker; the switch closed can be completed; wherein, described line-breaker receive that relaying protection system sends close order after perform described in cut-off operation.
3. compensator with series capaci tance as claimed in claim 2, it is characterized in that, described high-speed switch is specially: can complete first opening before phase contact is separated of described line-breaker the switch closed.
4. the compensator with series capaci tance as described in as arbitrary in claim 1-3, it is characterized in that, first parameter value and the second parameter value sum are less than the shortest switch off time of described line-breaker or the shortest opening time, described first parameter value is specially: 5 times of values of the time constant in the loop that described damping device and described capacitor are formed, and described second parameter value is specially: described high-speed switch close the time.
5. the compensator with series capaci tance as described in as arbitrary in claim 1-3, it is characterized in that, described high-speed switch is specially: based on the solid-state switch of power electronic device or the mechanical switch based on electromagnetic repulsion force mechanism.
6. a power delivery circuit, is characterized in that, comprising:
First power supply;
First impedance, is connected to described first power supply;
First line circuit breaker, is connected to described first impedance;
First compensator with series capaci tance, is connected to described first line circuit breaker, and described first compensator with series capaci tance is the arbitrary described compensator with series capaci tance of claim 1-5;
Transmission line, is connected to described first compensator with series capaci tance;
Second line-breaker, is connected to described transmission line;
Second impedance, is connected to described second line-breaker;
Second source, is connected to described second impedance.
7. power delivery circuit as claimed in claim 6, it is characterized in that, described power delivery circuit also comprises:
Second compensator with series capaci tance, is connected between described transmission line and described second line-breaker, and described second compensator with series capaci tance is the arbitrary described compensator with series capaci tance of claim 1-5.
8. a method for transient suppression recovery voltage, is characterized in that, be applied in power delivery circuit according to claim 6, described method comprises:
What reception relaying protection system sent closes order and cut-offs order, and wherein, described relaying protection system, when detecting that described power delivery circuit breaks down, closes order and cut-offs order described in producing simultaneously;
Close order described in response, control described high-speed switch and perform pass closing operation;
Cut-off order described in response, cut-off operation described in control circuit circuit breaker performs, described line-breaker is specially described first line circuit breaker and described second line-breaker.
9. method as claimed in claim 8, is characterized in that, described line-breaker cut-off operation start after and be the first duration at the duration first opened between phase contact between the arc extinction moment of described line-breaker;
The time that closes of described high-speed switch is the second duration, and described second duration is less than described first duration.
10. method as claimed in claim 9, is characterized in that, described line-breaker cut-off operation start after and described line-breaker to first open the duration that phase contact is separated between the moment be the 3rd duration, described 3rd duration is less than described first duration.
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