CN109347134A - Bipolar flexible direct-current power grid polar line electric main wiring system and online maintenance method - Google Patents
Bipolar flexible direct-current power grid polar line electric main wiring system and online maintenance method Download PDFInfo
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- CN109347134A CN109347134A CN201811329309.XA CN201811329309A CN109347134A CN 109347134 A CN109347134 A CN 109347134A CN 201811329309 A CN201811329309 A CN 201811329309A CN 109347134 A CN109347134 A CN 109347134A
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- 238000012423 maintenance Methods 0.000 title claims abstract description 17
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- 239000004020 conductor Substances 0.000 claims description 26
- 230000008439 repair process Effects 0.000 claims description 15
- 238000002955 isolation Methods 0.000 claims description 11
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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
- H02J3/36—Arrangements for transfer of electric power between AC networks via a high-tension DC link
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
- H02B3/00—Apparatus specially adapted for the manufacture, assembly, or maintenance of boards or switchgear
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- H02J3/005—
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
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Abstract
本发明涉及一种双极柔性直流电网极线电气主接线系统及在线检修方法，其包括从交流侧到极线的电气主接线电路，交流侧输电线一端经交流侧穿墙套管与从交流侧到极线的电气主接线电路一端连接，从交流侧到极线的电气主接线电路另一端经换流器到直流汇流母线的电气主接线电路连接至直流汇流母线一侧；交流侧输电线另一端经交流侧穿墙套管与从交流侧到中性线的电气主接线电路一端连接，从交流侧到中性线的电气主接线电路另一端经中性线穿墙套管与中性线区域连接；两直流断路器接线电路一端均与直流汇流母线另一侧连接，两直流断路器接线电路另一端分别经第一极线穿墙套管和第二极线穿墙套管与户外极线1电气主接线电路、户外极线2电气主接线电路连接。
The invention relates to a bipolar flexible DC power grid pole line electrical main wiring system and an on-line maintenance method, comprising an electrical main wiring circuit from an AC side to a pole line, one end of an AC side transmission line passing through a wall bushing on the AC side and connecting from the AC side to the pole line. One end of the electrical main wiring circuit from the side to the pole line is connected, and the other end of the electrical main wiring circuit from the AC side to the pole line is connected to one side of the DC bus bar through the inverter to the electrical main wiring circuit of the DC bus bar; AC side transmission line The other end is connected to one end of the electrical main wiring circuit from the AC side to the neutral line through the AC side wall bushing, and the other end of the electrical main wiring circuit from the AC side to the neutral line is connected to the neutral via the neutral line wall bushing. One end of the wiring circuit of the two DC circuit breakers is connected to the other side of the DC busbar, and the other end of the wiring circuit of the two DC circuit breakers is connected to the outdoor through the first pole line wall bushing and the second pole line wall bushing respectively. The pole line 1 electrical main wiring circuit and the outdoor pole line 2 electrical main wiring circuit are connected.
Description
Technical field
The present invention relates to a kind of flexible DC transmission technology fields, especially with regard to a kind of bipolar flexible DC grid polar curve
Bus arrangements and dc circuit breaker on-bne repair method.
Background technique
Flexible DC transmission technology is the HVDC Transmission Technology of new generation based on all-controlling power electronics device, has response
The features such as speed is fast, controllability is good, the method for operation is flexible, equivalent capability land occupation small scale, flexible DC transmission technology is being just at present
In Rapid development stage, a plurality of flexible DC transmission engineering is being planned, is designing, is being built, and such as domestic Chongqing Hubei Province ± 420kV is flexible
DC back to back engineering, tetra- end flexible direct current electricity power engineering of Zhangbei County ± 500kV, crow East Germany ± 800kV mix flexible DC transmission
Engineering etc..Large capacity flexible direct current power grid can play the technical advantage of flexible DC transmission, it can be achieved that multiple feed or falling more
Point power supply, is grid-connected extensive renewable energy, wind, light, storage, the access of pumped storage various energy resources and effective solution party of conveying
Case.
Electricity main wiring design is one of the key content of flexible direct current network system technology of transmission of electricity research, and electrical master connects
The determination of line and electric system entirety and converter station itself reliability of operation, flexibility and economy are closely related, and to electricity
The selection of gas equipment, power distribution equipment arrangement, relay protection and control mode have drafted larger impact.Therefore, it is necessary to correctly handle
Good each side relation of plane analyzes related influence factor comprehensively, rationally determines flexible HVDC transmission system Main Wire Connection Scheme.For two
The main electrical scheme of the flexible HVDC transmission system of variforms such as end, multiterminal, back-to-back, has more document both at home and abroad and discusses；But
How flexible direct current power grid electrical main connecting wire, especially line region electrical main connecting wire are designed to rarely have and be related to；Polar curve high pressure
Dc circuit breaker is one of key equipment most crucial in flexible direct current electricity power engineering, completes fault current in denumerable millisecond and opens
It is disconnected, quickly and reliably realize the isolation and coincidence of faulty line, while can realize that converter station is flexibly thrown in DC grid and move back,
Safety continuous operation to sane system is ensured, improves DC grid reliability and is of great significance.
Polar curve main electrical scheme covers the main primary equipment in line region, including modularization multi-level converter, direct current
Breaker, bridge arm reactor, direct current reactor, DC isolation and earthing switch, measuring device and arrester, wall bushing etc. one
Secondary device needs to disclose layout pattern and the relative position of each voltage and current measuring device.Change-over switch in neutral conductor region
Determination and electric system entirety and converter station itself reliability of operation, flexibility and economy it is closely related, and should meet
Three reliability, flexibility and economy basic demands: (1) reliability.Design scheme should be ensured that flexible direct current network system
There is higher reliability.(2) flexibility.When design scheme should meet normal operation and maintenance and requirement on flexibility when enlarging.
(3) economy.Design scheme should make every effort to simply, to save primary equipment.Meanwhile scheme occupied area is small.
The determination of electrical main connecting wire needs to consider that Insulation Coordination principle, control protect electrical measuring point to need, switch is run
Mode and inspecting state conversion, system starting charging etc..Polar curve electrical main connecting wire determines key equipment and such as switchs specific side
After case, another critical issue for needing to solve is the online inspection for how utilizing configured switch to complete dc circuit breaker
It repairs, the normal operation without influencing DC grid remainder.However existing technological means is not directed to bipolar band metallic return
Switch solution and dc circuit breaker on-bne repair method in flexible direct current power grid line region.
Summary of the invention
In view of the above-mentioned problems, the object of the present invention is to provide a kind of bipolar flexible DC grid polar curve bus arrangements
And dc circuit breaker on-bne repair method, it can quickly throw and move back without influencing remaining DC grid just because of On-line Fault in the change of current
Often operation, saves dc circuit breaker quantity, primary equipment low cost.
To achieve the above object, the present invention takes following technical scheme: a kind of bipolar flexible DC grid polar curve is electrically led
Wiring system, the main electrical scheme system are arranged in valve hall comprising from exchange side to the electrical main connecting wire circuit of polar curve, from exchange
Side connects to the electrical main connecting wire circuit of the neutral conductor, the electrical main connecting wire circuit of inverter to DC convergent current bus bar, with outdoor polar curve 1
The dc circuit breaker connection circuit connect and the dc circuit breaker device connection circuit being connect with outdoor polar curve 2；Exchange side power transmission line one
End is connect through the first exchange side wall bushing with the electrical main connecting wire circuit on one side from exchange side to polar curve, described from exchange
Side to polar curve the electrical main connecting wire circuit other end through the electrical main connecting wire circuit connection of the inverter to DC convergent current bus bar
To DC convergent current bus bar side；The exchange side power transmission line other end through second exchange side wall bushing with it is described from exchange side to
The electrical main connecting wire circuit on one side of the neutral conductor connects, in the electrical main connecting wire circuit other end warp from exchange side to the neutral conductor
Property line wall bushing is connect with neutral conductor region；Two dc circuit breaker connection circuit one end with the DC convergent current bus bar
Other side connection, the two dc circuit breaker connection circuit other ends are through walls through the first polar curve wall bushing and the second polar curve respectively
1 electrical main connecting wire circuit of casing and outdoor polar curve, 2 electrical main connecting wire circuit connection of outdoor polar curve.
Further, the electrical main connecting wire circuit from exchange side to polar curve includes the first earthing switch QS01, direct current survey
Measure device CT1, direct current arrester LV1, bridge arm valve tower, direct current arrester CBH, voltage measuring apparatus PT1 and direct current on inverter
Current measuring device CT3；The one end the direct-current measuring device CT1 is connect with exchange side power transmission line one end, is located at the two
Between be parallel with the first earthing switch QS01；The direct-current measuring device CT1 other end is through bridge arm valve tower on the inverter
It is connect with the one end the direct current measuring devices CT3, the direct current measuring devices CT3 other end is arrived with the inverter
The electrical main connecting wire circuit connection of DC convergent current bus bar；The bridge arm valve on the direct-current measuring device CT1 and the inverter
It is provided with the direct current arrester LV1 on route between tower, is located at bridge arm valve tower and the DC current on the inverter
The direct current arrester CBH and voltage measuring apparatus PT1 has successively been arranged in parallel on route between measuring device CT3.
Further, the electrical main connecting wire circuit of the inverter to DC convergent current bus bar include with the first earthing knife-switch QS11 and
The disconnecting switch Q1 of the double earthing knife-switch of the first band of second earthing knife-switch QS12, DC bus quick isolation switch CB1, third earthing knife-switch is had
The disconnecting switch Q2 and starting-up later time of the double earthing knife-switch of the second band of QS21 and the 4th earthing knife-switch QS22；Described one end first earthing knife-switch QS11,
Second one end earthing knife-switch QS12, third one end earthing knife-switch QS21 and the 4th one end earthing knife-switch QS22 are connected in parallel on the DC current measurement dress
It sets on the route between the CT3 other end and the DC convergent current bus bar；In the direct current measuring devices CT3 other end and institute
It states on the route between DC convergent current bus bar；It is arranged between the second earthing knife-switch QS12 and the third earthing knife-switch QS21
DC bus quick isolation switch CB1 is stated, the starting-up later time is connected in parallel on the both ends DC bus quick isolation switch CB1.
Further, the starting-up later time includes the disconnecting switch Q3 without earthing knife-switch being sequentially connected in series, DC side start-up resistor
R1 and DC current device CT4.
Further, the electrical main connecting wire circuit from exchange side to the neutral conductor includes the second earthing switch QS02, direct current
Measuring device CT2, direct current arrester LV2, inverter lower bridge arm valve tower, direct current arrester CBN1 and third earthing switch QS03；
The one end the direct-current measuring device CT2 is connect with the exchange side power transmission line other end, positioned at being parallel with described between the two
Two earthing switch QS02；The direct-current measuring device CT2 other end connects through the inverter lower bridge arm valve tower and neutral conductor region
It connects；The direct current is provided on route between the direct-current measuring device CT2 and the inverter lower bridge arm valve tower to keep away
Thunder device LV2 is successively arranged in parallel on the route between the inverter lower bridge arm valve tower and the neutral conductor region
State direct current arrester CBN1 and third earthing switch QS03.
Further, the dc circuit breaker connection circuit being connect with outdoor polar curve 1 and the direct current being connect with outdoor polar curve 2
Breaker connection circuit all includes dc circuit breaker DCCB1, dc circuit breaker maintenance circuit, direct current arrester DB1, the 4th ground connection
Switch QS04 and direct current measuring devices CT5；The dc circuit breaker maintenance circuit and the dc circuit breaker DCCB1 connect
It connects；The one end the dc circuit breaker DCCB1 is connect with the DC convergent current bus bar other side, and the dc circuit breaker DCCB1 is another
One end is through the direct current measuring devices CT5 and the outdoor polar curve electrical main connecting wire circuit connection；It is disconnected positioned at the direct current
Be arranged in parallel on the route of the road device DCCB1 other end and the direct current measuring devices CT5 direct current arrester DB1 and
4th earthing switch QS04.
Further, dc circuit breaker maintenance circuit include the 5th earthing knife-switch QS3, band list earthing knife-switch QS3 disconnecting switch Q3,
Disconnecting switch Q5 without the disconnecting switch Q4 of earthing knife-switch, the 6th earthing knife-switch QS5 and with single earthing knife-switch QS5；Positioned at the dc circuit breaker
The disconnecting switch Q3 of the band list earthing knife-switch QS3 is in series on route between DCCB1 and the DC convergent current bus bar, in the band
The 5th earthing knife-switch QS3 is parallel on route between the disconnecting switch Q3 of single earthing knife-switch QS3 and the dc circuit breaker DCCB1；
On route between the dc circuit breaker DCCB1 and the direct current measuring devices CT5 with being in series with the band list
The disconnecting switch Q5 of knife QS5, the line between the disconnecting switch Q5 and the dc circuit breaker DCCB1 of the band list earthing knife-switch QS5
Road is parallel with the 6th earthing knife-switch QS5；The disconnecting switch Q4 without earthing knife-switch is connected across the disconnecting switch with single earthing knife-switch QS3
Q3 and both ends disconnecting switch Q5 with single earthing knife-switch QS5.
Further, the direct current measuring devices CT5 is sleeve type structure, and the first polar curve wall bushing B3 is arranged
It is interior.
Further, described from exchange side to the first earthing switch QS01, Yi Jisuo in the electrical main connecting wire circuit of polar curve
State from exchange side in the electrical main connecting wire circuit of the neutral conductor the second earthing switch QS02 and third earthing switch QS03 adopt
With side wall formula earthing switch.
A kind of bipolar flexible DC grid polar curve electrical main connecting wire on-bne repair method based on above system, this method needle
On-bne repair is carried out to dc circuit breaker comprising following steps: 1) close the disconnecting switch Q4 without earthing knife-switch；2) direct current is disconnected
Breaker DCCB1；3) the disconnecting switch Q3 of the disconnecting strip list earthing knife-switch QS3 and disconnecting switch Q5 with single earthing knife-switch QS5；4) the 5th is closed
Earthing knife-switch QS3 and the 6th earthing knife-switch QS5；5) in dc circuit breaker DCCB1 maintenance process, polar curve electric current from bypass without earthing knife-switch every
It leaves and closes Q4 circulation, realize that polar curve dc circuit breaker on-bne repair transmission power is not interrupted.
The invention adopts the above technical scheme, which has the following advantages: 1, flexible direct current power grid polar curve of the invention
Region bus arrangements have many advantages, such as that required number of devices is few, configuration is compact, occupied area optimizes, economy is higher,
With dissemination.2, bipolar band DC bus high-speed switch allocation plan of the invention, can be fast because of On-line Fault in the change of current
Speed is thrown to move back and be operated normally without influencing remaining DC grid, and dc circuit breaker quantity, primary equipment low cost are saved.Meet spirit
Method of operation conversion living and maintenance requirement, while can satisfy the reliability of flexible direct current power grid.3, The present invention gives benefits
Dc circuit breaker on-bne repair is carried out with the switch configured, remaining DC grid is not influenced and operates normally, have step simple
The features such as easy, clear.In conclusion the present invention can be widely applied to the bipolar flexible direct current power grid with metallic return
Application.
Detailed description of the invention
Fig. 1 is bipolar flexible DC grid overall structure diagram；
Fig. 2 is polar curve bus arrangements structural schematic diagram of the invention；
Fig. 3 is the modularization multi-level converter three-phase structure schematic diagram based on half-bridge submodule；
Fig. 4 is existing customary DC breaker configuration method；
Fig. 5 is DC bus high-speed switch configuration method of the invention.
Specific embodiment
As shown in Figure 1, the present invention is to realize in bipolar flexible DC grid overall structure, any route or change
Stream unit exits the normal operation for not influencing DC grid residue element, then polar curve high voltage DC breaker is essential
's.There is no design and operation experience in view of the high pressure especially dc circuit breaker of 500kV or more, in actual motion possible breakdown rate compared with
Height, but carry out overhauling the normal operation that should do not influence remaining system as far as possible when failure.Therefore, it is needed based on this principle disconnected in direct current
Road device nearby configures reasonable disconnecting switch arrangement in order to overhaul.The present invention is carried out with reference to the accompanying drawings and examples
Detailed description.
As shown in Fig. 2, the present invention provides a kind of bipolar flexible DC grid polar curve bus arrangements, the main electrical scheme system
System is arranged in valve hall comprising from exchange side to the electrical main connecting wire circuit of polar curve, from exchange side to the electrical master of the neutral conductor
Connection circuit, the electrical main connecting wire circuit of inverter to DC convergent current bus bar, the dc circuit breaker wiring that is connect with outdoor polar curve 1
Circuit and the dc circuit breaker device connection circuit being connect with outdoor polar curve 2.It is through walls to exchange the exchange side of side power transmission line one end first
Casing B1 (a, b, c three-phase) is connect with from the electrical main connecting wire circuit on one side of exchange side to polar curve, from exchange side to the electricity of polar curve
Electrical main connecting wire circuit connection of the gas main wiring circuit other end through inverter to DC convergent current bus bar is to DC convergent current bus bar one
Side.The exchange side power transmission line other end through the second exchange side wall bushing B2 with from exchanging electrical main connecting wire circuit of the side to the neutral conductor
One end connection, the electrical main connecting wire circuit other end from exchange side to the neutral conductor is through neutral conductor wall bushing B5 and neutral conductor region
Connection.Two dc circuit breaker connection circuit one end are connect with the DC convergent current bus bar other side, two dc circuit breaker connection circuits
The other end respectively through the first polar curve wall bushing B3 and the second polar curve wall bushing B4 and outdoor 1 electrical main connecting wire circuit of polar curve,
Outdoor 2 electrical main connecting wire circuit connection of polar curve.
In above-described embodiment, it is preferred that the electrical main connecting wire circuit from exchange side to polar curve includes the first earthing switch (
Knife) QS01 (a, b, c three-phase), direct-current measuring device CT1 (a, b, c three-phase), direct current arrester LV1 (a, b, c three-phase), inverter
Upper bridge arm valve tower (a, b, c three-phase), direct current arrester CBH, voltage measuring apparatus PT1 and direct current measuring devices CT3.Direct current
The one end measuring device CT1 is connect with exchange side power transmission line one end, positioned at being parallel with the first earthing switch QS01 between the two；Direct current
The measuring device CT1 other end is connect through bridge arm valve tower on inverter with the one end direct current measuring devices CT3, DC current measurement
The electrical main connecting wire circuit connection of the device CT3 other end and inverter to DC convergent current bus bar.Positioned at direct-current measuring device CT1 with
Direct current arrester LV1, the one end direct current arrester LV1 ground connection are provided on route on inverter between bridge arm valve tower；Positioned at changing
Successively be arranged in parallel on route between bridge arm valve tower and direct current measuring devices CT3 on stream device direct current arrester CBH and
Voltage measuring apparatus PT1, the one end direct current arrester CBH and the one end voltage measuring apparatus PT1 are grounded；Voltage measuring apparatus PT1
For measuring line voltage, it to be used for DC over-voltage and under-voltage protection.
Wherein, it is additionally provided with DC voltage measuring device PT2 on DC convergent current bus bar side, is converged for measuring direct current
Flow busbar voltage.
In the various embodiments described above, it is preferred that the electrical main connecting wire circuit of inverter to DC convergent current bus bar is including the first
(earthing knife-switch is respectively the first earthing knife-switch QS11 and second to the disconnecting switch Q1 of the double earthing knife-switch of knife QS11, the second earthing knife-switch QS12, first band
QS12), DC bus quick isolation switch CB1 (CB1 is the AC circuit breaker with DC break down voltage ability), third earthing knife-switch
QS21, the 4th earthing knife-switch QS22, (earthing knife-switch is respectively third earthing knife-switch QS21 and the 4th earthing knife-switch to the second disconnecting switch Q2 with double earthing knife-switch
) and starting-up later time QS22.First one end earthing knife-switch QS11, second one end earthing knife-switch QS12, third one end earthing knife-switch QS21 and the 4th earthing knife-switch
The one end QS22 is connected in parallel on the route between the direct current measuring devices CT3 other end and DC convergent current bus bar, the first earthing knife-switch
The QS11 other end, the second earthing knife-switch QS12 other end, the third earthing knife-switch QS21 other end and the 4th earthing knife-switch QS22 other end are grounded.?
On route between the direct current measuring devices CT3 other end and DC convergent current bus bar；With third positioned at the second earthing knife-switch QS12
DC bus quick isolation switch CB1 is provided between knife QS21, starting-up later time is connected in parallel on the both ends CB1.
Wherein, starting-up later time includes being sequentially connected in series without the disconnecting switch Q3 of earthing knife-switch, DC side start-up resistor R1 and straight
Flow current device CT4.
In the various embodiments described above, it is preferred that the electrical main connecting wire circuit from exchange side to the neutral conductor is opened including the second ground connection
Close (earthing knife-switch) QS02 (a, b, c three-phase), direct-current measuring device CT2 (a, b, c three-phase), direct current arrester LV2 (a, b, c three-phase),
Inverter lower bridge arm valve tower (a, b, c three-phase), direct current arrester CBN1 and third earthing switch (earthing knife-switch) QS03.DC measurement dress
It sets the one end CT2 to connect with the exchange side power transmission line other end, positioned at being parallel with the second earthing switch QS02 between the two；DC measurement
The device CT2 other end is connect through inverter lower bridge arm valve tower with neutral conductor region.Under direct-current measuring device CT2 and inverter
Direct current arrester LV2, the one end direct current arrester LV2 ground connection are provided on route between bridge arm valve tower；The bridge under inverter
Direct current arrester CBN1 and third earthing switch QS03 have successively been arranged in parallel on route between arm valve tower and neutral conductor region,
Direct current arrester CBN1 and the one end third earthing switch QS03 are grounded.
In a preferred embodiment, the configuration of measuring device needs to be consistent with control design protection.Direct current is surveyed
Measure device CT1 and direct-current measuring device CT2 and measure bridge arm current, for bridge arm overcurrent protection and with direct-current measuring device CT3 structure
At current differential protection.
In the various embodiments described above, it is preferred that the dc circuit breaker connection circuit that is connect with outdoor polar curve 1 and with outdoor polar curve
2 connection dc circuit breaker connection circuit structure it is identical, by taking the dc circuit breaker connection circuit being connect with outdoor polar curve 1 as an example into
Row is discussed in detail.The dc circuit breaker connection circuit connecting with outdoor polar curve 1 includes dc circuit breaker DCCB1, dc circuit breaker
Overhaul circuit, direct current arrester DB1, the 4th earthing switch QS04 and direct current measuring devices CT5.Dc circuit breaker maintenance electricity
Road is connect with dc circuit breaker DCCB1；The one end dc circuit breaker DCCB1 is connect with the DC convergent current bus bar other side, direct current interruption
The device DCCB1 other end is through 1 electrical main connecting wire circuit connection of direct current measuring devices CT5 and outdoor polar curve.Positioned at direct current interruption
The ground connection of direct current arrester DB1 and the 4th has been arranged in parallel on the device DCCB1 other end and the route of direct current measuring devices CT5 to open
QS04 is closed, direct current arrester DB1 and the 4th one end earthing switch QS04 are grounded.
In a preferred embodiment, dc circuit breaker maintenance circuit includes the 5th earthing knife-switch QS3, with single earthing knife-switch QS3
Disconnecting switch Q3, the disconnecting switch Q4 without earthing knife-switch, the 6th earthing knife-switch QS5 and the disconnecting switch Q5 with single earthing knife-switch QS5.Positioned at direct current
The disconnecting switch Q3 with single earthing knife-switch QS3 is in series on route between breaker DCCB1 and DC convergent current bus bar, in the single earthing knife-switch of band
The 5th earthing knife-switch QS3 is parallel on route between the disconnecting switch Q3 and dc circuit breaker DCCB1 of QS3.Positioned at dc circuit breaker
The disconnecting switch Q5 with single earthing knife-switch QS5 is in series on route between DCCB1 and direct current measuring devices CT5, on the single ground of band
The 6th earthing knife-switch QS5 is parallel on route between the disconnecting switch Q5 and dc circuit breaker DCCB1 of knife QS5；5th earthing knife-switch QS3 and
6th one end earthing knife-switch QS5 is grounded.The disconnecting switch Q3 with single earthing knife-switch QS3 is connected across and with list without the disconnecting switch Q4 of earthing knife-switch
The both ends disconnecting switch Q5 of earthing knife-switch QS5.
In a preferred embodiment, direct-current measuring device CT5 and CT6 is sleeve type structure, and the first pole is respectively set
In line wall bushing B3 and the second polar curve wall bushing B4.
In the various embodiments described above, inverter, which uses, is based on modularization multi-level converter (as shown in Figure 3).
In the various embodiments described above, compromise between security and economy principle are answered in isolation, the selection of earthing switch and breaker:
It (1) is guarantee personnel, the maintenance safety of electric appliance and bus, when maintenance provides apparent electrical open point and grounding point；(2) rationally
Quantity and the position of earthing switch are set, guarantee economy.In above-mentioned main wiring circuit, earthing switch QS01, QS02, QS03 are equal
Using side wall formula earthing switch.
In the various embodiments described above, the arrangement needs of direct current arrester LV1, LV2 are consistent with Insulation Coordination research conclusion.
Direct current arrester LV1, LV2 are using following configuration and space layout for protecting key equipment in valve hall: direct current arrester
Switching impulse between main protection converter valve and bridge arm reactance, the failure for needing to study includes other bridge arm failures, to pole bridge arm
The impact of failure, valve top failure and converter transformer valve-side failure to the point.
In the various embodiments described above, outdoor 1 electrical main connecting wire circuit of polar curve is identical as outdoor 2 electrical main connecting wire circuit of polar curve,
It is described in detail by taking outdoor 1 electrical main connecting wire circuit of polar curve as an example.Outdoor 1 electrical main connecting wire circuit of polar curve includes direct current current-limiting
Reactor SR1, polar curve RI capacitor C1, current measuring device CT7, direct current measuring devices CT9, the 7th earthing knife-switch QS91,
Disconnecting switch Q9, direct current arrester DL11, DC voltage measuring device PT3 and the direct current of the double earthing knife-switch of eight earthing knife-switch QS92, third band
Arrester DL21.Direct current current-limiting one end reactor SR1 is connect with direct current measuring devices CT5, and direct current current-limiting reactor SR1 is another
One end is successively connected with the disconnecting switch Q9 of direct current measuring devices CT9 and the double earthing knife-switch of third band, through the double earthing knife-switch of third band
Disconnecting switch Q9 is connect with station 1.On route between direct current measuring devices CT9 and direct current current-limiting reactor SR1 simultaneously
Connection is provided with the branch in series by polar curve RI capacitor C1 and current measuring device CT7, branch one end ground connection.Positioned at straight
Direct current arrester has been arranged in parallel on route between galvanic electricity flow measuring apparatus CT9 and the disconnecting switch Q9 of the double earthing knife-switch of third band
DL11 has been arranged in parallel the 7th earthing knife-switch QS91 and the 8th earthing knife-switch QS92 at the both ends disconnecting switch Q9 of the double earthing knife-switch of third band respectively,
Direct current arrester DL11, the 7th earthing knife-switch QS91 and the 8th one end earthing knife-switch QS92 ground connection.Positioned at the disconnecting switch of the double earthing knife-switch of third band
DC voltage measuring device PT3 and direct current arrester DL21, DC voltage measurement have been arranged in parallel in the connection line at Q9 and station 1
Device PT3 and the one end direct current arrester DL21 ground connection.
In conclusion the operation of remaining DC grid should not be influenced when inverter is out of service because of failure.Conventional is straight
Stream breaker configuration system is as shown in figure 4, the inverter branch i.e. in DC convergent current bus bar side is also required to configuring direct current open circuit
Device, because dc circuit breaker cost is sufficiently expensive, program economy is poor.The present invention thes improvement is that compared with conventional scheme,
As shown in figure 5, the dc circuit breaker of inverter branch is changed to DC bus high-speed switch, DC bus high-speed switch is that have
The AC circuit breaker of DC break down voltage ability.DC bus high-speed switch both ends configure earthing switch, provide when for overhauling bright
The charge stored inside aobvious grounding point and equipment such as valve provides access of releasing.Direct current is used between inverter and DC convergent current bus bar
Bus high-speed switch.Such advantage is mainly reflected in: 1) DC bus high-speed switch has certain pressure resistance and arcing ability, therefore
Inverter has the function of online switching, fine compared to customary DC breaker scheme economy；2) the breaker actuation time
(separating brake) is substantially reduced in 40ms or so because converter fault causes power off time.
Based on above-mentioned main electrical scheme system, the present invention also provides a kind of bipolar flexible DC grid polar curve electrical main connecting wire is online
Repair method, this method carries out on-bne repair for dc circuit breaker, for overhauling dc circuit breaker DCCB1 comprising with
Lower step:
1) the disconnecting switch Q4 without earthing knife-switch is closed；
2) dc circuit breaker DCCB1 is disconnected；
3) the disconnecting switch Q3 of the disconnecting strip list earthing knife-switch QS3 and disconnecting switch Q5 with single earthing knife-switch QS5；
4) the 5th earthing knife-switch QS3 and the 6th earthing knife-switch QS5 is closed；
5) in dc circuit breaker DCCB1 maintenance process, polar curve electric current circulates from the disconnecting switch Q4 without earthing knife-switch of bypass,
Realize that polar curve dc circuit breaker on-bne repair transmission power is not interrupted.
In conclusion the flexible direct current power grid polar curve bus arrangements that the present embodiment provides, realize different modes
It is required needed for conversion, Insulation Coordination demand, control protection etc.；System of the invention is few with required equipment, economy is high
The features such as；Set DC bus high-speed switch scheme saves dc circuit breaker, and equipment manufacturing cost is low, and dc circuit breaker is online
Maintenance step has simply clear, convenient and easy etc. advantages, to improve the reliability and availability of flexible direct current power grid.It is right
Flexible direct current power network development has important development meaning.
The various embodiments described above are merely to illustrate the present invention, and structure and size, setting position and the step of each component are all can be with
It is varied, based on the technical solution of the present invention, all principles according to the present invention change individual part and step
Into and equivalents, should not exclude except protection scope of the present invention.
Claims (10)
1. a kind of bipolar flexible DC grid polar curve bus arrangements, which is arranged in valve hall, feature
Be: including from exchange side to polar curve electrical main connecting wire circuit, from exchange side to the electrical main connecting wire circuit of the neutral conductor, the change of current
Device to the electrical main connecting wire circuit of DC convergent current bus bar, the dc circuit breaker connection circuit that is connect with outdoor polar curve 1 and with open air
The dc circuit breaker device connection circuit that polar curve 2 connects；Exchange side power transmission line one end first exchange side wall bushing and it is described from
The electrical main connecting wire circuit on one side for exchanging side to polar curve connects, the electrical main connecting wire circuit other end from exchange side to polar curve
Electrical main connecting wire circuit connection through the inverter to DC convergent current bus bar is to DC convergent current bus bar side；The exchange side is defeated
The electric wire other end is connect through the second exchange side wall bushing with the electrical main connecting wire circuit on one side from exchange side to the neutral conductor,
The electrical main connecting wire circuit other end from exchange side to the neutral conductor is connect through neutral conductor wall bushing with neutral conductor region；Two
Dc circuit breaker connection circuit one end is connect with the DC convergent current bus bar other side, the two dc circuit breaker wiring
The circuit other end respectively through the first polar curve wall bushing and the second polar curve wall bushing and 1 electrical main connecting wire circuit of outdoor polar curve,
Outdoor 2 electrical main connecting wire circuit connection of polar curve.
2. system as described in claim 1, it is characterised in that: the electrical main connecting wire circuit from exchange side to polar curve includes the
One earthing switch QS01, direct-current measuring device CT1, direct current arrester LV1, bridge arm valve tower on inverter, direct current arrester CBH,
Voltage measuring apparatus PT1 and direct current measuring devices CT3；The one end the direct-current measuring device CT1 exchanges side transmission of electricity with described
Line one end connection, positioned at being parallel with the first earthing switch QS01 between the two；The direct-current measuring device CT1 other end warp
Bridge arm valve tower is connect with the one end the direct current measuring devices CT3 on the inverter, the direct current measuring devices CT3
The electrical main connecting wire circuit connection of the other end and the inverter to DC convergent current bus bar；Positioned at the direct-current measuring device CT1
With the direct current arrester LV1 is provided on the route on the inverter between bridge arm valve tower, be located at the inverter on bridge
Successively be arranged in parallel on route between arm valve tower and the direct current measuring devices CT3 direct current arrester CBH and
Voltage measuring apparatus PT1.
3. system as claimed in claim 2, it is characterised in that: the electrical main connecting wire circuit of the inverter to DC convergent current bus bar
Disconnecting switch Q1, DC bus including the double earthing knife-switch of the first band with the first earthing knife-switch QS11 and the second earthing knife-switch QS12 quickly isolate
Switch CB1, the with third earthing knife-switch QS21 and the 4th earthing knife-switch QS22 second disconnecting switch Q2 and starting-up later time with double earthing knife-switch；Institute
It is in parallel to state first one end earthing knife-switch QS11, second one end earthing knife-switch QS12, third one end earthing knife-switch QS21 and the 4th one end earthing knife-switch QS22
On route between the direct current measuring devices CT3 other end and the DC convergent current bus bar；In the DC current
On route between the measuring device CT3 other end and the DC convergent current bus bar；Positioned at the second earthing knife-switch QS12 and described the
The DC bus quick isolation switch CB1 is provided between three earthing knife-switch QS21, it is female that the starting-up later time is connected in parallel on the direct current
The both ends line quick isolation switch CB1.
4. system as claimed in claim 3, it is characterised in that: the starting-up later time includes the isolation without earthing knife-switch being sequentially connected in series
Switch Q3, DC side start-up resistor R1 and DC current device CT4.
5. system as described in claim 1, it is characterised in that: described to include from the electrical main connecting wire circuit for exchanging side to the neutral conductor
Second earthing switch QS02, direct-current measuring device CT2, direct current arrester LV2, inverter lower bridge arm valve tower, direct current arrester
CBN1 and third earthing switch QS03；The one end the direct-current measuring device CT2 is connect with the exchange side power transmission line other end, position
In being parallel with the second earthing switch QS02 between the two；The direct-current measuring device CT2 other end is through under the inverter
Bridge arm valve tower is connect with neutral conductor region；Between the direct-current measuring device CT2 and the inverter lower bridge arm valve tower
The direct current arrester LV2 is provided on route, between the inverter lower bridge arm valve tower and the neutral conductor region
The direct current arrester CBN1 and third earthing switch QS03 have successively been arranged in parallel on route.
6. system as described in claim 1, it is characterised in that: the dc circuit breaker connection circuit being connect with outdoor polar curve 1
It all include dc circuit breaker DCCB1, dc circuit breaker maintenance electricity with the dc circuit breaker connection circuit being connect with outdoor polar curve 2
Road, direct current arrester DB1, the 4th earthing switch QS04 and direct current measuring devices CT5；The dc circuit breaker overhauls circuit
It is connect with the dc circuit breaker DCCB1；The one end the dc circuit breaker DCCB1 and the DC convergent current bus bar other side connect
It connects, the dc circuit breaker DCCB1 other end is through the direct current measuring devices CT5 and the outdoor polar curve electrical main connecting wire
Circuit connection；It sets positioned at the dc circuit breaker DCCB1 other end is in parallel on the route of the direct current measuring devices CT5
It is equipped with the direct current arrester DB1 and the 4th earthing switch QS04.
7. system as claimed in claim 6, it is characterised in that: the dc circuit breaker maintenance circuit includes the 5th earthing knife-switch QS3, band
The disconnecting switch Q3 of single earthing knife-switch QS3, the disconnecting switch Q4 without earthing knife-switch, the 6th earthing knife-switch QS5 and the disconnecting switch with single earthing knife-switch QS5
Q5；The band list earthing knife-switch QS3 is in series on route between the dc circuit breaker DCCB1 and the DC convergent current bus bar
Disconnecting switch Q3, on the route between the disconnecting switch Q3 and the dc circuit breaker DCCB1 of the band list earthing knife-switch QS3 simultaneously
It is associated with the 5th earthing knife-switch QS3；Line between the dc circuit breaker DCCB1 and the direct current measuring devices CT5
Road is in series with the disconnecting switch Q5 of the band list earthing knife-switch QS5, in the disconnecting switch Q5 and the direct current of the band list earthing knife-switch QS5
The 6th earthing knife-switch QS5 is parallel on route between breaker DCCB1；The disconnecting switch Q4 without earthing knife-switch is connected across band
The disconnecting switch Q3 of single earthing knife-switch QS3 and both ends disconnecting switch Q5 with single earthing knife-switch QS5.
8. system as claimed in claim 6, it is characterised in that: the direct current measuring devices CT5 is sleeve type structure, setting
In the first polar curve wall bushing B3.
9. system as described in claim 1, it is characterised in that: the from exchange side into the electrical main connecting wire circuit of polar curve
One earthing switch QS01 and it is described from exchange side in the electrical main connecting wire circuit of the neutral conductor the second earthing switch QS02 and
Third earthing switch QS03 is all made of side wall formula earthing switch.
10. a kind of existed based on the bipolar flexible DC grid polar curve electrical main connecting wire of system as described in any one of claim 6 to 8
Line repair method, this method carry out on-bne repair for dc circuit breaker, it is characterised in that the following steps are included:
1) the disconnecting switch Q4 without earthing knife-switch is closed；
2) dc circuit breaker DCCB1 is disconnected；
3) the disconnecting switch Q3 of the disconnecting strip list earthing knife-switch QS3 and disconnecting switch Q5 with single earthing knife-switch QS5；
4) the 5th earthing knife-switch QS3 and the 6th earthing knife-switch QS5 is closed；
5) in dc circuit breaker DCCB1 maintenance process, polar curve electric current circulates from the disconnecting switch Q4 without earthing knife-switch of bypass, realizes
Polar curve dc circuit breaker on-bne repair transmission power is not interrupted.
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