CN207603211U - A kind of three end DC transmission systems - Google Patents
A kind of three end DC transmission systems Download PDFInfo
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- CN207603211U CN207603211U CN201721463288.1U CN201721463288U CN207603211U CN 207603211 U CN207603211 U CN 207603211U CN 201721463288 U CN201721463288 U CN 201721463288U CN 207603211 U CN207603211 U CN 207603211U
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 43
- 238000006243 chemical reaction Methods 0.000 claims abstract description 94
- 230000008859 change Effects 0.000 claims description 2
- 230000036632 reaction speed Effects 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 230000018109 developmental process Effects 0.000 description 4
- 230000005611 electricity Effects 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 238000002955 isolation Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000007935 neutral effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000005404 monopole Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000033772 system development Effects 0.000 description 1
- 238000013024 troubleshooting Methods 0.000 description 1
Classifications
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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]
Abstract
The utility model is related to a kind of three end DC transmission systems, pass through two switch combinations set in three current conversion stations, it is needing a current conversion station from when rectification mode switches to inverter mode, another current conversion station switches to rectification mode from inverter mode, the break-make that respective switch need to only be controlled to combine, it can be achieved with being switched fast for current conversion station operational mode, ensure the reliable switching of operational mode, reduce investment and cost, make fault reaction speed rapider.
Description
Technical field
The utility model belongs to multi-terminal HVDC transmission technology field, and in particular to a kind of three end DC transmission systems.
Background technology
With the continuous development of electric system, application of the direct current transportation in power grid increases year by year.Compared to traditional friendship
Stream transmission of electricity, D.C. high voltage transmission have many advantages, such as circuit low cost, power attenuation it is small, without reactive-load compensation, be more suitable for large capacity
Remote transmission." transferring electricity from the west to the east, on national network " war is formulated to solve the imbalance problem of China's energy and economic development
In slightly, D.C. high voltage transmission has all played key effect.
However, traditional direct current transportation is still rested in the two-terminal direct current transmission system level of point-to-point transmission.With
The development of new energy, grid-connected, multiple feed and the powered power grid demand of more drop points of distributed generation resource, multi-terminal HVDC transmission
System starts to receive significant attention.
Compared to two-terminal DC transmission system network, multi-terminal HVDC transmission network can save line corridor, reduce operating cost,
Power supply reliability and flexibility are more preferable, and system redundancy configuration can adapt to different powering modes, and power flowcontrol is more flexibly pacified
Entirely, also there is great improvement result for influence of the new energy to power network safety operation.
Due to the limitation of dc circuit breaker technology development, troubleshooting technology seriously constrains multi-terminal direct current transmission system
Development.At present, multi-terminal direct current transmission system can be divided into two kinds of Series FPB and parallel FPB, straight with ad eundem between tandem type current conversion station
Galvanic electricity stream is run, and power distribution is determined by DC voltage, is run between parallel connection type current conversion station with ad eundem DC voltage, power point
With being determined by DC current.But the multi-terminal direct current transmission system topology proposed at present has cost high, less economical, adjusts
The shortcomings of adjusting range is small, and difficulty is realized in trend reversion, and failure handling mechanisms are not perfect limits the work of multi-terminal direct current transmission system
Cheng Yingyong.
Utility model content
The purpose of this utility model is to provide a kind of three end DC transmission systems, for solving existing three end DC power transmission system
Current conversion station operational mode switches slow and insecure problem in system.
In order to solve the above technical problems, the utility model proposes a kind of three end DC transmission systems, including following solution party
Case：
Including three DC converter stations in parallel, two switch combinations, respectively first switch combination and second are further included
Switch combination, each switch combination are respectively provided with there are three terminal, are passed through between each two terminal and are switched connection；Three direct currents
The main wiring mode of current conversion station is bipolar ground connection pattern, and the anode circuit of three DC converter stations connects first switch group respectively
Three terminals closed, the cathode circuit of three DC converter stations connect three terminals of second switch combination respectively；
The anode transverter of each DC converter station connects the anode circuit of respective DC converter station by first switch, often
The cathode transverter of a DC converter station connects the cathode circuit of respective DC converter station by second switch.
The anode transverter of each DC converter station also connects the cathode circuit of respective current conversion station by third switch, each
The cathode transverter of DC converter station also connects the anode circuit of respective current conversion station by the 4th switch.
Described two switch combinations are disposed therein in a DC converter station.
Three end DC transmission systems further include the positive electrode bus and negative electrode bus for connecting each DC converter station respectively, described
First switch connects the anode circuit by positive electrode bus, and the second switch connects the negative line by negative electrode bus
Road.
The beneficial effects of the utility model are：
The utility model is being needed a current conversion station from whole by two switch combinations being set in three current conversion stations
Stream mode switch to inverter mode, another current conversion station from inverter mode switch to rectification mode when, only need to control respective switch
The break-make of combination can be achieved with being switched fast slowly for current conversion station operational mode, ensure the reliable switching of operational mode.
Fast-speed direct current switch centralized configuration in a current conversion station, is saved quantity by the utility model, reduce investment with into
This, fault reaction speed is rapider, each configuration for holding disconnecting switch, and effective cooperation with fast-speed direct current switch can be rapid
Dipole inversion and the transimission power reversion of realization system, control are more flexible.
Description of the drawings
Fig. 1 is the structure chart of three end DC transmission systems；
Fig. 2 is three end DC transmission system dipole inversion control procedure charts；
Fig. 3 is three end DC transmission system line fault schematic diagrames；
Fig. 4-1 is that S1 stations run on rectification mode, S2 stations run on the signal of inverter mode in three end DC transmission systems
Figure；
Fig. 4-2 is the schematic diagram for being latched S1, S3 current conversion station；
Fig. 4-3 is the schematic diagram of high-speed switch Q14S2, Q17S2 for disconnecting S2 current conversion stations；
Fig. 4-4 be disconnect S1 current conversion stations Q1S1, Q2S1, Q5S1 and Q6S1, be closed S1 current conversion stations Q3S1, Q4S1,
Q7S1 and Q8S1, disconnect S3 current conversion stations Q1S3, Q2S3, Q5S3 and Q6S3, be closed S3 current conversion stations Q3S3, Q4S3, Q7S3 and
The schematic diagram of Q8S3；
Fig. 4-5 is the schematic diagram of high-speed switch Q14S2, Q17S2 for being closed S2 current conversion stations；
Fig. 4-6 is unlock S1, S3 current conversion station, and S1 runs on inverter mode, and S3 runs on the schematic diagram of rectification mode.
Specific embodiment
Specific embodiment of the present utility model is further described below in conjunction with the accompanying drawings.
Embodiment one：
The three end DC transmission systems of the present embodiment including three DC converter stations in parallel, further include two switching groups
Close, respectively first switch combination and second switch combination, each switch combination is respectively provided with there are three terminal, each two terminal it
Between pass through switch connection；The main wiring mode of three DC converter stations is bipolar ground connection pattern, three DC converter stations
Anode circuit connect three terminals of first switch combination respectively, the cathode circuit of three DC converter stations connects second respectively
Three terminals of switch combination.One of DC converter station of three DC converter stations is provided with common ground point, remaining
The neutral bus of DC converter station is all connected on the common ground point.
The three end DC transmission systems based on above structure, when its for two DC converter stations for needing running mode switching
In first current conversion station of conduct run on that rectification mode, another is as the second current conversion station when running on inverter mode, use
Following steps switch the operational mode of two DC converter stations：
1) the first current conversion station and the second current conversion station are latched, by the way that first switch is controlled to combine, second switch combination disconnect the
The connection of one current conversion station and the second current conversion station；
2) first current conversion station is controlled to switch to inverter mode from rectification mode, controls second current conversion station from inversion
Pattern switching is to rectification mode；
3) connection of the combination of control first switch, second switch combination the first current conversion station of connection and the second current conversion station, unlock
First current conversion station and the second current conversion station.
The utility model is being needed a current conversion station from whole by two switch combinations being set in three current conversion stations
Stream mode switch to inverter mode, another current conversion station from inverter mode switch to rectification mode when, only need to control respective switch
The break-make of combination can be achieved with being switched fast slowly for current conversion station operational mode, ensure the reliable switching of operational mode.
As further improvement of this embodiment, three end DC transmission systems of above structure, each DC converter station
Anode transverter connects the anode circuit of respective DC converter station, the cathode transverter of each DC converter station by first switch
The cathode circuit of respective DC converter station is connected by second switch.The anode transverter of each DC converter station also passes through third
Switch connects the cathode circuit of respective current conversion station, and the cathode transverter of each DC converter station is also respective by the 4th switch connection
The anode circuit of current conversion station.
Also, above-mentioned two switch combination is arranged in one of DC converter station, each DC converter station setting
There are positive electrode bus and negative electrode bus, first switch connects corresponding anode circuit by positive electrode bus, and second switch passes through cathode mother
Line connects respective negative circuit.
For three DC converter stations, the positive-negative polarity of wherein any one current conversion station follows the steps below conversion：
(1) locking needs the current conversion station of the reverse of polarity, and control first switch combination is combined with second switch, disconnects described turn
The current conversion station of polar exchanging and the connection of other current conversion stations；
(2) first switch and second switch in the current conversion station of the reverse of polarity are disconnected, is closed the reverse of polarity
Third switch and the 4th switch in current conversion station；
(3) combination of control first switch is combined with second switch, connects current conversion station and other changes of current of the reverse of polarity
The connection stood unlocks the current conversion station after dipole inversion.
The utility model can also realize that the polarity in current conversion station turns by the control of respective switch in two switch combinations
It changes, the anode for improving current conversion station is switched to cathode while cathode is switched to the speed of anode, while ensures system after polarity switching
Stability.
Embodiment two：
The three end DC transmission systems of the present embodiment are as shown in Figure 1, comprising three customary DC current conversion stations, using bipolar
The mode of connection, common ground point are disposed therein S2 current conversion stations, bipolar (anode and cathode) the neutral bus phase with two station of S1, S3
Even.
Each current conversion station with it is standby there are two the disconnecting switch Q10S1 being isolated for transverter and DC bipolar busbar,
Q11S1, Q10S2, Q11S2, Q10S3, Q11S3 and eight dipole inversion disconnecting switch being isolated for dipole inversion and pole,
It stands for S1, respectively Q1S1, Q2S1, Q3S1, Q4S1, Q5S1, Q6S1, Q7S1 and Q8S1；It stands for S2, respectively Q1S2,
Q2S2, Q3S2, Q4S2, Q5S2, Q6S2, Q7S2 and Q8S2；For S3 stand, respectively Q1S3, Q2S3, Q3S3, Q4S3, Q5S3,
Q6S3, Q7S3 and Q8S3.
S2 current conversion stations are furnished with three DC quick switches of Angle connection, just extremely Q12S2, Q13S2 and Q14S2 per pole,
Cathode is Q15S2, Q16S2 and Q17S2, and exit is equipped with two disconnecting switch.
Based on above-mentioned three end DC transmission system, the polarity conversion method of three end DC transmission system of the utility model, such as
Shown in Fig. 2, step is as follows：
(1) S1, S2 current conversion station run on rectification mode, and operation power is all 1500MW, and S3 current conversion stations run on inversion mould
Formula, power 3000MW；
(2) S1 current conversion station power is reduced, is latched S1 current conversion stations, S3 current conversion stations receive power and are down to 1500MW；
(3) high-speed switch Q14S2, Q17S2 of S2 current conversion stations are disconnected, S2, S3 current conversion station power are 1500MW；S1 is disconnected to change
Q1S1, Q2S1, Q5S1 and the Q6S1 at station are flowed, is closed Q3S1, Q4S1, Q7S1 and Q8S1 of S1 current conversion stations, S2, S3 current conversion station power
For 1500MW；
(4) high-speed switch Q13S2, Q16S2 of S2 current conversion stations are closed, S2, S3 current conversion station power are 1500MW, with inversion mould
Formula unlocks S1 current conversion stations, and it is 750MW that S1, S3 current conversion station, which receive power, and S2 current conversion stations power is 1500MW.
Based on above-mentioned three end DC transmission system, the fast power reversion control of three end DC transmission system of the utility model
Method, process include the following steps as shown in Fig. 4-1, Fig. 4-2, Fig. 4-3, Fig. 4-4, Fig. 4-5, Fig. 4-6：
(1) S1 current conversion stations run on rectification mode, and S3 current conversion stations run on inverter mode；
(2) S1 current conversion station power is reduced, is latched S1, S3 current conversion station；
(3) disconnect S2 current conversion stations high-speed switch Q14S2, Q17S2, disconnect S1 current conversion stations Q1S1, Q2S1, Q5S1 and
Q6S1 is closed Q3S1, Q4S1, Q7S1 and Q8S1 of S1 current conversion stations, disconnects Q1S3, Q2S3, Q5S3 and Q6S3 of S3 current conversion stations, closes
Close Q3S3, Q4S3, Q7S3 and Q8S3 of S3 current conversion stations；
(4) high-speed switch Q14S2, Q17S2 of S2 current conversion stations are closed, unlocks S1, S3 current conversion station, S1 runs on inversion mould
Formula, S3 run on rectification mode, and power reverses are completed.
Based on above-mentioned three end DC transmission system, the Fault Isolation Strategy of three end DC transmission system of the utility model,
For implementation process as shown in figure 3, S1 current conversion stations are sending end converting plant, S2, S3 current conversion station are receiving end Inverter Station, when straight between S2, S3 pole 1
When Flow Line breaks down, process of fault isolation is as follows：
(1) 1 transimission power of S1 current conversion stations pole is limited reduction；
(2) permanent fault is determine whether through three_phase reclosing, if permanent fault, is latched S3 current conversion station anodes；
(3) the fast-speed direct current switch Q14S2 of S2 current conversion stations is disconnected；
(4) S1 current conversion stations restore bipolar power transmission, and S2 current conversion stations restore bipolar operation, and S3 current conversion stations operate in monopole mould
Formula.
The multi-terminal direct current transmission system fault isolation schemes that the utility model is switched based on fast-speed direct current, to faulty line into
Row is accurately positioned, quickly isolates, and reduces fault incidence, ensures non-faulting part normal operation.
Fast-speed direct current switch centralized configuration in a current conversion station, is saved quantity by the utility model, reduce investment with into
This, fault reaction speed is rapider, each configuration for holding disconnecting switch, and effective cooperation with fast-speed direct current switch can be rapid
Dipole inversion and the transimission power reversion of realization system, control are more flexible.
The above is only the preferred embodiment of the present invention, is not intended to limit the utility model, for this field
Technical staff for, various modifications and changes may be made to the present invention.Within the spirit and principle of the utility model,
Any modification, equivalent replacement, improvement and so on should be included within the right of the utility model.
Claims (4)
1. a kind of three end DC transmission systems, including three DC converter stations in parallel, which is characterized in that further include two switches
Combination, respectively first switch combination and second switch combination, each switch combination are respectively provided with there are three terminal, each two terminal
Between pass through switch connection；The main wiring mode of three DC converter stations is bipolar ground connection pattern, three DC converters
The anode circuit stood connects three terminals of first switch combination respectively, and the cathode circuits of three DC converter stations connects the respectively
Three terminals of two switch combinations；
One of DC converter station of three DC converter stations is provided with common ground point, the neutrality of remaining DC converter station
Busbar is all connected on the common ground point.
2. three end according to claim 1 DC transmission system, which is characterized in that the anode change of current of each DC converter station
Device connects the anode circuit of respective DC converter station by first switch, and the cathode transverter of each DC converter station passes through second
Switch connects the cathode circuit of respective DC converter station；
The anode transverter of each DC converter station also connects the cathode circuit of respective current conversion station, each direct current by third switch
The cathode transverter of current conversion station also connects the anode circuit of respective current conversion station by the 4th switch.
3. three end according to claim 1 DC transmission system, which is characterized in that described two switch combinations are arranged on it
In in a DC converter station.
4. three end according to claim 2 DC transmission system, which is characterized in that three end DC transmission systems further include point
The positive electrode bus and negative electrode bus of each DC converter station are not connected, and the first switch connects the anode by positive electrode bus
Circuit, the second switch connect the cathode circuit by negative electrode bus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721463288.1U CN207603211U (en) | 2017-11-06 | 2017-11-06 | A kind of three end DC transmission systems |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201721463288.1U CN207603211U (en) | 2017-11-06 | 2017-11-06 | A kind of three end DC transmission systems |
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| CN207603211U true CN207603211U (en) | 2018-07-10 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107732894A (en) * | 2017-11-06 | 2018-02-23 | 许继电气股份有限公司 | A kind of control method of three end DC transmission system and its current conversion station |
-
2017
- 2017-11-06 CN CN201721463288.1U patent/CN207603211U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107732894A (en) * | 2017-11-06 | 2018-02-23 | 许继电气股份有限公司 | A kind of control method of three end DC transmission system and its current conversion station |
| CN107732894B (en) * | 2017-11-06 | 2024-04-12 | 许继电气股份有限公司 | Three-terminal direct current transmission system and control method of converter station thereof |
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