CN203553959U - Multi-terminal flexible direct-current power transmission system - Google Patents
Multi-terminal flexible direct-current power transmission system Download PDFInfo
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- CN203553959U CN203553959U CN201320757409.9U CN201320757409U CN203553959U CN 203553959 U CN203553959 U CN 203553959U CN 201320757409 U CN201320757409 U CN 201320757409U CN 203553959 U CN203553959 U CN 203553959U
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 44
- 238000002955 isolation Methods 0.000 claims abstract description 33
- 238000006243 chemical reaction Methods 0.000 claims description 29
- 238000012423 maintenance Methods 0.000 claims description 10
- 230000000694 effects Effects 0.000 abstract description 4
- 238000000034 method Methods 0.000 description 8
- 238000005516 engineering process Methods 0.000 description 7
- 230000035800 maturation Effects 0.000 description 3
- 229910018503 SF6 Inorganic materials 0.000 description 2
- 238000013459 approach Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- SFZCNBIFKDRMGX-UHFFFAOYSA-N sulfur hexafluoride Chemical compound FS(F)(F)(F)(F)F SFZCNBIFKDRMGX-UHFFFAOYSA-N 0.000 description 2
- 229960000909 sulfur hexafluoride Drugs 0.000 description 2
- 206010033799 Paralysis Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
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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
The utility model relates to a flexible direct current transmission system of multiterminal, including four converter stations, one of them converter station needs to be overhauld, every converter station direct current side contains two sets of isolation switch QS1, QS2 of establishing ties each other, establish ties AC circuit breaker Q2 in the middle of QS1 and QS2, QS1 and the parallelly connected isolation switch QS3 in QS2 both sides, the alternating current side includes the AC inlet wire switch Q1 of establishing ties each other, converter transformer, establish ties between direct current circuit and the busbar and keep apart switch QS 4. The utility model discloses compromise power system to the requirement of overhauing the flexible direct current transmission system of multiple ends, with the help of flexible direct current transmission system control characteristic, utilize alternating current breaker can cut off the characteristics of undercurrent direct current circuit, establish ties alternating current breaker in converter station direct current side, play direct current breaker's effect, simultaneously for the operational safety of guarantee alternating current breaker and extension alternating current breaker's life, at the parallelly connected isolator in alternating current breaker both ends, play the effect that switches on normal operating current.
Description
Technical field
The utility model belongs to electric and electronic technical field, particularly a kind of multiterminal flexible DC power transmission system.
Background technology
It is generally to cut-off by circuit breaker that element in electric power system enters inspecting state from running status, and in AC system, the every cycle of electric current has natural zero-crossing point twice, and AC circuit breaker makes full use of extinguish arcs on this exactly on opportunity, completes medium recovery.And there is not natural zero-crossing point in direct current system, therefore, cut-offfing DC line will be difficult a lot, the top priority that DC line is cut-off is extinguish arcs, next is due to the existence of inductance in direct current system, in system, stored a large amount of energy, need to take effective means these energy that dissipate, need over-voltage suppression simultaneously, guarantee that gap completes medium recovery and protection system equipment is avoided damaging, although there are now a lot of direct currents to cut-off method, picture " manually manufacturing balance method ", " increase arc voltage method ", but these methods have certain scope of application, limited in one's ability, equipment manufacturing cost costliness, not yet be generalized to engineering application.
Rapid as basic Technology of HVDC based Voltage Source Converter develops can turn-off power electronic device and PWM technology, compared with traditional direct current, its maximum feature is to have two control freedom degrees, can control flexibly current conversion station DC bus-bar voltage and power situation according to electrical network and load operation situation.Multiterminal Technology of HVDC based Voltage Source Converter more has superiority than two ends Technology of HVDC based Voltage Source Converter in operational flexibility, reliability, build multiterminal flexible DC power transmission can to meet the power supply of Power System Interconnection, urban distribution network, multiple wind energy turbine set (new forms of energy) interconnected etc. simultaneously, but multiterminal flexible DC power transmission system opposite end DC transmission system is more complicated, service requirement is higher, the problem easily occurring is more, and how keeping the reliable and stable operation of multiterminal flexible DC power transmission system safety is question of common concern.When multiterminal flexible DC power transmission systematic steady state moves, one of them current conversion station from DC side and isolation of system of how stopping transport, and do not affect the normal operation of all the other current conversion stations, there is important practical value, but also there is no good solution.At present, can not through engineering approaches under the prerequisite of application at DC circuit breaker, first a station of stopping transport in maintenance multiterminal flexible DC power transmission system needs whole system to stop transport, then by the flexible DC power transmission system restart retaining.The method has following shortcoming:
1) increased the stoppage in transit probability of multiterminal flexible DC power transmission system;
2), if operational system is connected with important load, in order to overhaul a current conversion station, will cause heavy losses;
3), if operational system is connected with wind energy turbine set (new forms of energy), in order to overhaul a current conversion station, will cause new forms of energy
Exit and again drop into, reduced energy utilization rate;
4) if two asynchronous electrical networks pass through multiterminal flexible DC power transmission systems connection, will in order to overhaul a current conversion station
Can cause two asynchronous electrical network internal power imbalances, the stable control protection of electrical network action, loses part power supply or load, even causes cascading failure, causes synchronised grids paralysis;
5) if area power grid interconnection forms by exchanging with multiterminal flexible DC power transmission system, in order to overhaul a current conversion station, may cause alternating current circuit overload, even Line Flow exceedes its temporarily steady limit, causes the stable control protection of electrical network action.
In sum, under the DC circuit breaker background that not yet through engineering approaches is applied, in order to improve multiterminal flexible DC power transmission stability and reliability, give full play to the advantage of multiterminal flexible DC power transmission, need the one online isolation of DC line more flexibly and effectively and combination method.
Summary of the invention
The purpose of this utility model is that while overhauling the single current conversion station of multiterminal flexible DC power transmission system for stopping transport, this problem of whole system need to being stopped transport, provides a kind of multiterminal flexible DC power transmission system.The utility model multiterminal flexible DC power transmission system can realize tradition and think the function of the charged isolation of the DC line that needs DC circuit breaker to realize and maintenance, under the prerequisite of whole multiterminal flexible DC power transmission system of not stopping transport, realize flexible isolation and the maintenance of the single current conversion station of multiterminal flexible direct current system.
In order to achieve the above object, the solution the utility model proposes is:
Multiterminal flexible DC power transmission system of the present utility model, include four current conversion stations, one of them current conversion station needs maintenance, two groups of isolation switch QS1, QS2 that each current conversion station DC side comprises mutual series connection, series connection AC circuit breaker Q2 in the middle of QS1 and QS2, QS1 isolation switch QS3 in parallel with QS2 both sides, AC comprises interchange service entrance switch Q1, the converter transformer of mutual series connection, isolation switch QS4 connects between DC line and bus rod.
Above-mentioned interchange service entrance switch Q1 is ac hv breaker.
Above-mentioned AC circuit breaker Q2 is ac hv breaker.
Above-mentioned isolation switch QS1, QS2 are high voltage isolators.
Above-mentioned converter transformer is Δ/Yn type converter transformer.
Technical characterstic of the present utility model is: the utility model is taken into account the requirement of electric power system to maintenance multiterminal flexible DC power transmission system, by the control characteristic of flexible DC power transmission system itself, utilize AC circuit breaker can cut off the feature of little current DC circuit, AC circuit breaker is connected on to current conversion station DC side, play the effect of DC circuit breaker, simultaneously in order to ensure the handling safety of AC circuit breaker and to extend the useful life of AC circuit breaker, at AC circuit breaker two ends parallel-connection isolation switch, play the normal running current of conducting.
The beneficial effects of the utility model are: the utility model utilizes the AC circuit breaker of technology maturation to replace the DC circuit breaker of that it(?) still can not engineering apply to carry out the maintenance of multiterminal flexible DC power transmission system, have solved because current conversion station of maintenance or DC line and the problem of the whole multiterminal flexible DC power transmission system of stopping transport.This application possess skills maturation, economical reliable, realize feature simple, excellent performance, can be applicable in multiterminal flexible DC power transmission Practical Project.
Accompanying drawing explanation
Fig. 1 is single current conversion station topological structure schematic diagram;
Fig. 2 is multiterminal flexible DC power transmission system schematic, and wherein the topological structure at single station is the topological structure (explanation as an example of four end flexible DC power transmission systems example) that Fig. 1 describes.
Embodiment
Below with reference to accompanying drawing and specifically enforcement, to singly standing in line isolation and grid-connected method in a kind of multiterminal flexible DC power transmission system the utility model proposes, be elaborated.
The utility model be for multiterminal flexible DC power transmission system comprise by DC line connect three ends and current conversion stations more than three ends, two groups of group isolation switch QS1, QS2 that wherein each current conversion station DC side comprises mutual series connection, its topological structure as shown in Figure 1, series connection AC circuit breaker Q2 in the middle of QS1 and QS2, QS1 isolation switch QS3 in parallel with QS2 both sides, AC comprises the interchange service entrance switch Q1 of mutual series connection, converter transformer, isolation switch QS4 connects between DC line and bus rod.
As shown in Figure 2, current conversion station 1,2,3,4 forms the just four end flexible DC power transmission systems in stable operation, one group of AC circuit breaker Q2 of its DC side series direct current side series connection, isolation switch QS1, QS2 is in a point position, its isolation switch QS3 in parallel is in co-bit, and DC line electric current is not by isolation switch QS3 and by AC circuit breaker Q2.
In the present embodiment, above-mentioned interchange service entrance switch Q1 is ac hv breaker, as outdoor AC high-voltage sulfur hexafluoride breaker.
In the present embodiment, above-mentioned AC circuit breaker Q2 is ac hv breaker, as outdoor AC high-voltage sulfur hexafluoride breaker.
In the present embodiment, above-mentioned isolation switch QS1, QS2 are high voltage isolators, as GW type high voltage isolator.
In the present embodiment, above-mentioned converter transformer is Δ/Yn type converter transformer, and between neutral point and the earth, connects a larger earth resistance.
In order to overhaul current conversion station 4 smoothly, the whole flexible DC power transmission system of not stopping transport need to be taked following steps to the current conversion station 4 that enters maintenance:
1) close two isolation switch QS1 that DC side is connected, QS2;
2) close the AC circuit breaker Q2 of DC side;
3) divide the isolation switch QS3 in parallel with it;
4) current conversion station that locking need to be overhauled;
5) divide AC to exchange service entrance switch Q1;
6) divide the AC circuit breaker Q2 of DC side;
7) the isolation switch QS1 that divides DC side to connect, QS2;
8) divide the isolation switch QS4 of bus rod, enter shut down condition.
When being positioned at the current conversion station 4 of shut down condition, need to be incorporated to multiterminal flexible DC power transmission system when operation, the current conversion station 4 of stoppage in transit moves in the following order:
1) in STATCOM mode, start;
2) close bus rod isolation switch QS4;
3) difference of controlling current conversion station DC bus-bar voltage and line voltage distribution is in allowed band;
4) close DC side series connection isolation switch QS1, QS2;
5) temporary locking current conversion station;
6) close DC side AC circuit breaker Q2;
7) stoppage in transit station operational mode is arranged to determine active power and reactive power pattern
8) release is stopped transport and is stood;
9) merge connection isolation switch QS3;
10) divide DC side AC circuit breaker Q2;
11) divide DC side series connection isolation switch QS1, QS2;
Technical characterstic of the present utility model is to take into account the requirement of electric power system to maintenance multiterminal flexible DC power transmission system, by the control characteristic of flexible DC power transmission system itself, utilize AC circuit breaker can cut off the feature of little current DC circuit, AC circuit breaker is connected on to current conversion station DC side, play the effect of DC circuit breaker, simultaneously in order to ensure the handling safety of AC circuit breaker and to extend the useful life of AC circuit breaker, at AC circuit breaker two ends parallel-connection isolation switch, play the normal running current of conducting.It realizes simple, excellent performance, economic reliable, and technology maturation, can be applicable in multiterminal flexible DC power transmission Practical Project.
So far, in a kind of multiterminal flexible DC power transmission system the utility model proposes, singly standing in line isolation and grid-connected method task all completes.
Claims (5)
1. a multiterminal flexible DC power transmission system, it is characterized in that including four current conversion stations, one of them current conversion station needs maintenance, two groups of isolation switch QS1, QS2 that each current conversion station DC side comprises mutual series connection, series connection AC circuit breaker Q2 in the middle of QS1 and QS2, QS1 isolation switch QS3 in parallel with QS2 both sides, AC comprises interchange service entrance switch Q1, the converter transformer of mutual series connection, isolation switch QS4 connects between DC line and bus rod.
2. multiterminal flexible DC power transmission system according to claim 1, is characterized in that above-mentioned interchange service entrance switch Q1 is ac hv breaker.
3. multiterminal flexible DC power transmission system according to claim 1, is characterized in that above-mentioned AC circuit breaker Q2 is ac hv breaker.
4. multiterminal flexible DC power transmission system according to claim 1, is characterized in that above-mentioned isolation switch QS1, QS2 are high voltage isolators.
5. multiterminal flexible DC power transmission system according to claim 1, is characterized in that above-mentioned converter transformer is Δ/Yn type converter transformer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320757409.9U CN203553959U (en) | 2013-11-27 | 2013-11-27 | Multi-terminal flexible direct-current power transmission system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201320757409.9U CN203553959U (en) | 2013-11-27 | 2013-11-27 | Multi-terminal flexible direct-current power transmission system |
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| CN203553959U true CN203553959U (en) | 2014-04-16 |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103618329A (en) * | 2013-11-27 | 2014-03-05 | 南方电网科学研究院有限责任公司 | Multi-terminal flexible direct current transmission system and single-station online isolation and grid connection method thereof |
| CN104065096A (en) * | 2014-07-10 | 2014-09-24 | 南京南瑞继保电气有限公司 | Method for reducing total-stop risk of terminal substations under faults through direct-current transmission |
| CN105245017A (en) * | 2015-11-21 | 2016-01-13 | 中国能源建设集团广东省电力设计研究院有限公司 | Live monitoring method and system for high-voltage DC power transmission line |
| CN105978134A (en) * | 2016-06-22 | 2016-09-28 | 清华大学 | Uninterrupted electric power exchanger used for alternating current power distribution system |
| CN106058907A (en) * | 2016-06-30 | 2016-10-26 | 国网浙江省电力公司电力科学研究院 | Method of inputting line into DC network in multi-end flexible DC power transmission system |
| CN106487032A (en) * | 2016-11-16 | 2017-03-08 | 南方电网科学研究院有限责任公司 | Multi-terminal flexible direct current transmission control method |
| CN108400610A (en) * | 2018-03-23 | 2018-08-14 | 南方电网科学研究院有限责任公司 | Converter station online input method and device of multi-terminal flexible direct current transmission system |
| CN109687495A (en) * | 2017-10-18 | 2019-04-26 | 南京南瑞继保电气有限公司 | Series-connection multi-terminal direct current system converter station is grounded polar circuit and its control method |
-
2013
- 2013-11-27 CN CN201320757409.9U patent/CN203553959U/en not_active Expired - Lifetime
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103618329A (en) * | 2013-11-27 | 2014-03-05 | 南方电网科学研究院有限责任公司 | Multi-terminal flexible direct current transmission system and single-station online isolation and grid connection method thereof |
| CN104065096A (en) * | 2014-07-10 | 2014-09-24 | 南京南瑞继保电气有限公司 | Method for reducing total-stop risk of terminal substations under faults through direct-current transmission |
| CN104065096B (en) * | 2014-07-10 | 2016-08-24 | 南京南瑞继保电气有限公司 | A kind of direct current transportation is utilized to reduce the method for full cut-off risk under one-end substation fault |
| CN105245017A (en) * | 2015-11-21 | 2016-01-13 | 中国能源建设集团广东省电力设计研究院有限公司 | Live monitoring method and system for high-voltage DC power transmission line |
| CN105245017B (en) * | 2015-11-21 | 2020-06-16 | 中国能源建设集团广东省电力设计研究院有限公司 | Live monitoring method and system for high-voltage direct-current transmission line |
| CN105978134B (en) * | 2016-06-22 | 2018-10-19 | 清华大学 | A kind of uninterrupted power exchanger for alternating-current system |
| CN105978134A (en) * | 2016-06-22 | 2016-09-28 | 清华大学 | Uninterrupted electric power exchanger used for alternating current power distribution system |
| CN106058907A (en) * | 2016-06-30 | 2016-10-26 | 国网浙江省电力公司电力科学研究院 | Method of inputting line into DC network in multi-end flexible DC power transmission system |
| CN106487032A (en) * | 2016-11-16 | 2017-03-08 | 南方电网科学研究院有限责任公司 | Multi-terminal flexible direct current transmission control method |
| CN106487032B (en) * | 2016-11-16 | 2019-04-19 | 南方电网科学研究院有限责任公司 | Multi-terminal flexible direct current transmission control method |
| CN109687495A (en) * | 2017-10-18 | 2019-04-26 | 南京南瑞继保电气有限公司 | Series-connection multi-terminal direct current system converter station is grounded polar circuit and its control method |
| CN109687495B (en) * | 2017-10-18 | 2022-07-22 | 南京南瑞继保电气有限公司 | Grounding electrode circuit of converter station of series multi-terminal direct current transmission system and control method thereof |
| CN108400610A (en) * | 2018-03-23 | 2018-08-14 | 南方电网科学研究院有限责任公司 | Converter station online input method and device of multi-terminal flexible direct current transmission system |
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Granted publication date: 20140416 |