CN207251198U - A kind of bipolar flexible direct current transmission system - Google Patents
A kind of bipolar flexible direct current transmission system Download PDFInfo
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- CN207251198U CN207251198U CN201721263061.2U CN201721263061U CN207251198U CN 207251198 U CN207251198 U CN 207251198U CN 201721263061 U CN201721263061 U CN 201721263061U CN 207251198 U CN207251198 U CN 207251198U
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Abstract
The utility model discloses a kind of bipolar flexible direct current transmission system, the bipolar flexible direct current transmission system includes two modularization multi-level converters, the exchange side of two transverters is in parallel, and the DC side common port of two transverters forms the neutral bus of bipolar flexible direct current transmission system；Further include station earthing reactor and bridge arm reactor, wherein, earthing reactor of standing is arranged between bipolar flexible direct current transmission system earth point and neutral bus, and bridge arm reactor is arranged on 6 bridge arms and is coupled respectively positioned at converter valve and alternating-current field between the three-phase tie point of transformer valve side.Any transverter forms a pole of bipolar flexible direct current transmission system in the system, bridge arm reactor and station earthing reactor are configured in transverter main electrical scheme, in the case where ensureing flexible direct current power transmission system existing capability, by configuring reactor, the climbing speed of all kinds of failure lower bridge arm fault currents and line fault electric current can inhibit.
Description
Technical field
The utility model belongs to Power System Flexible technical field of direct current power transmission, and more particularly to a kind of bipolar flexible direct current is defeated
Electric system.
Background technology
The voltage source converter of modular multilevel structure, with output voltage closer to sine wave, switching frequency is low for it,
Small, the characteristics of fault ride-through capacity is strong is lost, unites to passive weak pattern, wind-driven generator is grid-connected, and large city power supply etc. has
Wide application prospect.Converter valve and converter transformer valve on each bridge arm of voltage source converter of modular multilevel structure
Between side connect bridge arm reactor, and with the leakage reactance collective effect of exchange side transverter, can control converter power output, filter
Ripple, suppress bridge arm circulation.
If converter fault, failure electricity occur for the bipolar flexible direct current transmission system based on modularization multi-level converter
Stream can increase rapidly, if not suppressing the increase of fault current effectively, the equipment safety in system will be caused to seriously endanger.It is existing
There is bipolar flexible direct current transmission system in scheme to limit bridge arm by reasonable disposition bridge arm reactor, pole busbar smoothing reactor
Fault current climbing speed, to ensure that key equipment is no more than stresses of parts under most harsh failure in the systems such as converter valve.
But for some more harsh station internal faults, such as ground short circuit between lower bridge arm reactor and lower bridge arm converter valve,
Bridge arm reactance and the flat ripple reactance of pole busbar hardly play failure current limit.
Meanwhile still lack the engineering practice for overhead line configuration reactor in existing soft straight engineering.It is in addition, theoretical at present
In engineering design, configuration and design to all kinds of reactors of bipolar flexible direct current transmission system are also in explore and study rank
Section.
Utility model content
The purpose of this utility model, is to provide a kind of bipolar flexible direct current transmission system, any transverter in the system
A pole of bipolar flexible direct current transmission system is formed, bridge arm reactor, feed(er) reactor, flat ripple are configured in transverter main electrical scheme
Reactor, neutral reactor, configuration station earthing reactor at bipolar flexible direct current transmission system earth point.Ensureing that flexibility is straight
In the case of flowing transmission system existing capability, by configuring reactor, all kinds of failure lower bridge arm fault currents and circuit are can inhibit
The climbing speed of fault current.
In order to achieve the above objectives, the solution of the utility model is：
A kind of bipolar flexible direct current transmission system, the bipolar flexible direct current transmission system include two modular multilevels
Transverter, the exchange side of two transverters is in parallel, and the DC side common port of two transverters forms bipolar flexible DC power transmission system
The neutral bus of system；Station earthing reactor and bridge arm reactor are further included, wherein, it is straight that earthing reactor of standing is arranged in bipolar flexible
Flow between transmission system earth point and neutral bus, bridge arm reactor is arranged on 6 bridge arms and is located at converter valve and friendship respectively
Flow field is coupled between the three-phase tie point of transformer valve side.
Said system further includes the feed(er) reactor being arranged between direct current pole busbar and DC line.
Said system further includes the smoothing reactor being arranged between converter valve and direct current pole busbar.
Said system further includes the neutral reactor being arranged between converter valve and neutral bus.
After using the above scheme, the beneficial effects of the utility model are：
(1) earthing reactor is configured in bipolar flexible transmission system, short circuit current flow is to the change of current when can reduce station internal fault
The influence of valve safe operation.
(2) in bipolar flexible transmission system, dc circuit breaker, converter valve etc. can be met by reasonable disposition reactor
Key equipment is no more than the transient state maximum current impact that switching device can be born under all kinds of failures in system, is that bipolar flexible is defeated
Important foundation has been laid in the stabilization safe operation of electric system.
(3) configure the line reactor can provide obvious protection border in bipolar flexible transmission system, improve circuit and protect
The reliability of traveling-wave protection and voltage jump amount protection act in shield, and ensure the selectivity of route protection action, while can be with
The climbing speed of short circuit current flow during limiting circuitry failure, to reduce the requirement of DC line protection actuation time.
(4) configure the line reactor, smoothing reactor, neutral reactor, Ke Yijin in bipolar flexible transmission system
The climbing speed of short circuit current flow, ensures respectively to set in bipolar flexible direct current transmission system when one step limiting circuitry failure and station internal fault
Standby safe operation.
(5) for some more harsh station internal faults, such as ground short circuit between lower bridge arm reactor and lower bridge arm converter valve,
, can be by configuring neutral bus reactor and station when bridge arm reactance and the flat ripple reactance of pole busbar hardly play failure current limit
Earthing reactor, to suppress the development of above-mentioned fault current, reduces the climbing speed of fault current, how electric reaches raising modularization
The purpose of the through-flow margin of safety of switching device in flat converter valve.
Brief description of the drawings
1 configuration diagram of bipolar flexible direct current transmission system pole of Fig. 1 reactors that have been complete configuration, pole 2 configure it is identical, in figure
Omit；
Fig. 2 is 1 configuration diagram of bipolar flexible direct current transmission system pole for not configuring smoothing reactor (X3), pole 2 configure it is identical,
Omitted in figure；
Fig. 3 is 1 configuration diagram of bipolar flexible direct current transmission system pole of non-configure the line reactor (X2), pole 2 configure it is identical,
Omitted in figure；
The current intelligence of fault current when Fig. 4 is failure at bipolar both-end flexible direct current power transmission system line side K1；
The current intelligence of fault current when Fig. 5 is failure at bipolar both-end flexible direct current power transmission system transverter K2.
Embodiment
Below with reference to attached drawing, the technical solution of the utility model is described in detail.
Fig. 1 is the reactor allocation plan of 1 transverter of bipolar flexible direct current transmission system pole, and complete configuration is double in Fig. 1
Reactor on one pole transverter main electrical scheme of pole flexible direct current power transmission system, including：Bridge arm reactor X1, feed(er) reactor X2,
Smoothing reactor X3, neutral reactor X4, configuration station earthing reactor X5 at system earth point G1.Bridge arm reactor X1 is arranged
It is coupled on 6 bridge arms and respectively positioned at converter valve V1 and alternating-current field between transformer C1 valves side three-phase tie point Oa, Ob, Oc；
Every DC line L1~LK respectively configure the line reactor X2, feed(er) reactor X2 be respectively arranged in dc circuit breaker B1~
The nearly DC line L1~LK sides of BK；The smoothing reactor X3 is placed between converter valve V1 and direct current pole busbar M1；The neutrality
Line reactor X4 is arranged between converter valve V1 and DC neutral busbar M0；The station earthing reactor X5 is arranged in bipolar flexible
Between DC transmission system earth point G1 and DC neutral busbar M0.Fig. 1 eliminates 2 change of current of bipolar flexible direct current transmission system pole
The configuring condition of device, the reactor deployment scenarios homopolarity 1 of 2 transverter of pole., can when double-end double pole flexible direct current power transmission system is run
To select the station earthing switch NBGS by two stations to close, at the same the earth metallic return change-over switch GRTS at two stations is complete
Portion separates, and system is run with earthing mode at this time；The station earthing switch NBGS at one of station and the earth metal can also be returned
Line change-over switch GRTS closes, and the earth metallic return change-over switch GRTS is only closed at another station, by earthing switch of standing
NBGS is separated, then system is run in a manner of metallic return at this time.
Fig. 2 and Fig. 3 is the derivative structure of Fig. 1, and Fig. 2 is the bipolar flexible direct current transportation for not configuring smoothing reactor (X3)
1 configuration diagram of system pole；Fig. 3 is 1 configuration diagram of bipolar flexible direct current transmission system pole of non-configure the line reactor (X2).Actual work
Cheng Zhongke controls consumption according to short circuit current flow, reasonably selects reactor allocation plan.
Fig. 4 is the K1 failures under the both-end method of operation of bipolar direct current transmission system, and 2 part of pole is omitted in figure.Stand 1 is fixed
Voltage station and through reactor X5 be grounded, two stations are run in a manner of metallic return.Station 2 is sent for power station and to station 1 during normal operation
Power.Earth fault K1 occurs for 1 circuit of pole during system operation, and before submodule is non-latching, fault current is mainly by submodule
Block capacitance discharge current forms, and the discharge current of bridge arm submodule capacitance can be only investigated when estimating fault current.Three-phase in Fig. 4
The submodule capacitance discharge current of bridge arm is respectively IK1A、IK1B、IK1C, the short circuit current flow I of line side trouble pointK1=IK1A+IK1B+
IK1C.After failure occurs, fault current IK1AThe 2 upper and lower bridge arm reactor X1 of station in Fig. 4 is flowed successively through, 2 pole busbares of standing are put down anti-
X3, stand 2 feed(er) reactor X2, line fault earth point K1, and stand 1 earthing reactor X5, and stand 2 neutral reactor X4.IK1B、IK1CStream
Understanding and considerate condition is identical, and which is not described herein again.By reasonable disposition bridge arm reactor X1, pole busbar puts down anti-X3, and feed(er) reactor X2, connects
The size of ground reactor X5 and neutral reactor X4, can reduce line fault electric current IK1Climbing speed.
Fig. 5 is the K2 failures under the both-end method of operation of bipolar direct current transmission system, and 2 part of pole is omitted in figure.Stand 1 is fixed
Voltage station and through reactor X5 be grounded, two stations are run in a manner of metallic return.Station 2 is sent for power station and to station 1 during normal operation
Power.Stand during system operation and earth fault K2 occurs on 2 pole, 1 transverter at the points of common connection of bridge arm valve top, as shown in figure 5,
The submodule capacitance discharge current of three-phase bridge arm is respectively I during failureK2A、IK2B、IK2C, the short circuit of upper bridge arm valve top trouble point K2
Electric current IK2=IK2A+IK2B+IK2C.After failure occurs, A phase bridgc arm short fault currents IK2AThe station in Fig. 5 is flowed successively through about 2
Bridge arm reactor X1, upper bridge arm valve fault ground point K2, stand 1 earthing reactor X5, and stand 2 neutral reactor X4.IK1B、IK1CCirculation
Situation is identical, and which is not described herein again.By reasonable disposition bridge arm reactor X1, neutral reactor X4 and station earthing reactor X5,
The short circuit current flow I of bridge arm valve top fault ground point K2 on transverter in station can be reducedK2Climbing speed.
Above example is only to illustrate the technological thought of the utility model, it is impossible to the protection model of the utility model is limited with this
Enclose, it is every according to the utility model proposes technological thought, any change done on the basis of technical solution, each falls within this reality
Within the scope of novel protected.
Claims (4)
1. a kind of bipolar flexible direct current transmission system, the bipolar flexible direct current transmission system is changed comprising two modular multilevels
Device is flowed, the exchange side of two transverters is in parallel, and the DC side common port of two transverters forms bipolar flexible direct current transmission system
Neutral bus；It is characterized in that：Station earthing reactor and bridge arm reactor are further included, wherein, earthing reactor of standing is arranged in
Between bipolar flexible direct current transmission system earth point and neutral bus, bridge arm reactor is arranged on 6 bridge arms and is located at respectively
Converter valve and alternating-current field are coupled between the three-phase tie point of transformer valve side.
A kind of 2. bipolar flexible direct current transmission system as claimed in claim 1, it is characterised in that：Further include and be arranged in direct current pole
Feed(er) reactor between busbar and DC line.
A kind of 3. bipolar flexible direct current transmission system as claimed in claim 1, it is characterised in that：Further include and be arranged in converter valve
Smoothing reactor between the busbar of direct current pole.
A kind of 4. bipolar flexible direct current transmission system as claimed in claim 1, it is characterised in that：Further include and be arranged in converter valve
Neutral reactor between neutral bus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721263061.2U CN207251198U (en) | 2017-09-27 | 2017-09-27 | A kind of bipolar flexible direct current transmission system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721263061.2U CN207251198U (en) | 2017-09-27 | 2017-09-27 | A kind of bipolar flexible direct current transmission system |
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| Publication Number | Publication Date |
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| CN207251198U true CN207251198U (en) | 2018-04-17 |
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| CN201721263061.2U Active CN207251198U (en) | 2017-09-27 | 2017-09-27 | A kind of bipolar flexible direct current transmission system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111273192A (en) * | 2020-03-19 | 2020-06-12 | 南京南瑞继保电气有限公司 | Fault backup protection method and device for converter of flexible direct current transmission system |
| CN112688288A (en) * | 2020-12-25 | 2021-04-20 | 中国电力工程顾问集团中南电力设计院有限公司 | Overvoltage control protection method for submodule of symmetrical bipolar flexible direct-current power transmission system |
-
2017
- 2017-09-27 CN CN201721263061.2U patent/CN207251198U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111273192A (en) * | 2020-03-19 | 2020-06-12 | 南京南瑞继保电气有限公司 | Fault backup protection method and device for converter of flexible direct current transmission system |
| CN112688288A (en) * | 2020-12-25 | 2021-04-20 | 中国电力工程顾问集团中南电力设计院有限公司 | Overvoltage control protection method for submodule of symmetrical bipolar flexible direct-current power transmission system |
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