CN106058908A - Topology structure for improving flexibility of multi-terminal flexible DC power transmission system - Google Patents
Topology structure for improving flexibility of multi-terminal flexible DC power transmission system Download PDFInfo
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- CN106058908A CN106058908A CN201610547225.8A CN201610547225A CN106058908A CN 106058908 A CN106058908 A CN 106058908A CN 201610547225 A CN201610547225 A CN 201610547225A CN 106058908 A CN106058908 A CN 106058908A
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- soft straight
- multiterminal
- transmission system
- soft
- current conversion
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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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- 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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- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
Abstract
The invention provides a topology structure for improving flexibility of a multi-terminal flexible DC power transmission system. Through changing a connection topology structure of a flexible DC converter station and an AC side, each converter station can be in interconnection with multiple AC regions, when the quantity of the AC regions of the converter station is greater than the quantity of flexible DC converter stations, the multi-terminal flexible DC system can be in interconnection with the multiple AC regions through switching operation of an AC side breaker, and flexibility of multi-terminal flexible DC power transmission is greatly improved. Compared with the prior art, the topology structure is advantaged in that power supply reliability and operation control flexibility of a terminal transformer station are improved, and mutual power support of the multiple AC regions can be realized through multi-terminal flexible DC power transmission.
Description
Technical field
The present invention relates to a kind of Technology of HVDC based Voltage Source Converter, be specifically related to a kind of raising soft straight transmission system motility of multiterminal
Topological structure.
Background technology
Along with the rapid growth of power network development, the quickening of Process of Urbanization Construction paces, city electric unit is more and more intensive, supplies
Electric line and the increase of power supply, cause continuing to increase of system short circuit capacity, in order to reduce the capacity of short circuit of system, and city electricity
Net gradually takes the structure that layering and zoning is run, urban distribution network partition running can reduce the short circuit current of electrical network so that power supply
Subregion becomes apparent from.But the urban distribution network reliability of partition running will be had a greatly reduced quality, once there is N-1 in alternating current circuit or main transformer
Fault can not be run, it would be possible to causes normal circuit or main transformer the situation of overload occur, it has to take cutting load or confession
Electricity region grid switching operation.More serious situation, alternating current circuit, bus or main transformer that once one-end substation is connected with electrical network occur
All accidents of tripping operation, it would be possible to cause the risk that one-end substation all has a power failure.For this fault, low-voltage etc. can be taked
The method of grid switching operation transfer load of level circuit, but owing to grid switching operation requires time for up to the most several hours of several tens minutes,
Along with the development of digital economy, this power outage is subject to people's attention, and domestic and international power monitoring mechanism has been included in confession
Electricity Reliability Check index system.For power supply is than the urban distribution network of comparatively dense, this power outage is difficult to accept especially,
In the big city of China, had occurred and that the accident causing small-scale to have a power failure due to the fault of one-end substation several times, to warp
The influence on development of Ji society constitutes more serious impact.
In order to improve city zoning electrical network power supply reliability, when properly functioning, partition power grid can be passed through the soft straight reality of multiterminal
The interconnection of existing partition power grid.Due to soft directly have power quickly respond, the function such as active reactive independent regulation, it is possible to achieve subregion
The functions such as mutual confession, power quickly support, this greatly strengthen the power supply reliability of urban distribution network to a certain extent.But city is electric
The method of operation of net is changeable, if each soft straight current conversion station connects a subregion, when some subregion needs power to support and other
During the subregion that current conversion station connects heavy duty too, then now will not pass through the soft power that directly realizes and support.Even one soft directly
Current conversion station connects the form of a subregion, and its power supply motility will be substantially reduced.
Summary of the invention
Defect that the purpose of the present invention is contemplated to overcome above-mentioned prior art to exist and provide that a kind of to improve multiterminal soft directly
The topological structure of transmission system motility, the method is by connecting multiple exchange subregions at soft straight current conversion station AC so that many
Hold the soft straight transmission system method of operation more flexible.Combination can realize multiple subregion mutual by the interconnection of soft straight current conversion station
Confession, but in order to be formed without new electromagnetic looped network between subregion, in any one moment, each current conversion station can only realize with a subregion
Interconnection.Time properly functioning, the power load distributing of monitoring partition power grid, if the load of certain subregion is heavier, then by controlling chopper
The light-load region deciliter connecting other current conversion stations, the trend of underloading subregion is helped by the soft allotment of multiterminal the friendship of heavily loaded subregion
Stream electrical network.Comparing a current conversion station and only connect the topological structure of a subregion, this new topological structure of proposition avoids many
Individual subregion is heavily loaded and can not in case of emergency realize the situation of subregion confession mutually.Greatly enhance the soft straight transmission of electricity spirit of multiterminal
Activity.
In order to achieve the above object, the solution of the present invention is:
A kind of topological structure improving the soft straight transmission system motility of multiterminal, it is characterised in that: each soft straight current conversion station with
Multiple communication area are connected, and are controlled the connection of soft straight current conversion station and communication area by AC circuit breaker, it is achieved multiterminal soft straight and
The connection of different communication area, when monitoring certain region and needing soft straight power to support, leads to the area power of underloading
Cross the soft region needing power to support that is directly fed rapidly into of multiterminal, increase the motility of the soft straight transmission of electricity of multiterminal.
Further: described soft straight current conversion station is made up of voltage source converter, include but not limited to two level block,
Transformator multiple inverter configuration or modular multilevel structure.
Further: the soft straight transmission system of described multiterminal, it is mainly used in urban distribution network and realizes multiple partition power grid
Interconnection architecture, is supported by the soft power directly realizing partition power grid of multiterminal.
Further: described multiple partition power grid, it is characterised in that: described multiple partition power grid, can be cities
The independent partitions electrical network that sub area division is clearer and more definite, can be one-end substation, it is also possible to be sectionalized busbar.
Further: described a kind of topological structure improving the soft straight transmission system motility of multiterminal, in order to avoid being formed
New electromagnetic looped network, described soft straight current conversion station and the connection in multiple regions, pass through chopper at soft straight current conversion station of each moment
Can only select to be connected with a communication area.
Further: the motility of described a kind of topological structure improving the soft straight transmission system motility of multiterminal is:
If each current conversion station connects two exchange subregions, then the type that can realize four subregion interconnections of four inverter combinations can
With up to 16 kinds, the most each current conversion station can also further expand to the interconnection exchanging subregion interconnect with N number of subregion, it is achieved
More subregion interconnection combination, the motility of the soft straight application of multiterminal is greatly improved.
Further: the soft straight transmission system of described multiterminal, can be two ends, three ends, four ends, to extend to N end soft directly
Transmission system, its terminal number is identical with the number of inverter.
Use after such scheme, the present invention can improve Multi-end flexible direct current transmission system urban distribution network apply flexible
Property and reliability.Time properly functioning, carried out the reasonable distribution of trend by the load condition detecting each subregion, it is ensured that partition power grid
Load balancing, reduce system losses.When emergency, supported by the soft straight fast power of multiterminal, use the present invention to carry
The topological structure gone out, for a soft straight transmission system in two ends, it is only necessary to do less change at current conversion station AC, i.e.
Increase exchanges chopper and part circuit.One current conversion station connects two subregions, and the method for operation can increase to 4 kinds, can be very
Big degree improves the motility of the soft straight operation of multiterminal, its remarkable in economical benefits.Similar structure can be used, for multiterminal (N)
Soft straight transmission system, if each current conversion station connects M subregion, the method for operation that can realize the most in theory reaches MNKind, economical
Benefit is more significantly.
Accompanying drawing explanation
Fig. 1 be one embodiment of the invention can the soft straight transmission system structural representation of multiterminal of expanding type；
Fig. 2 be the present invention another execute example can the soft straight transmission system structural representation of multiterminal of expanding type.
Detailed description of the invention
Below in conjunction with the accompanying drawings the detailed description of the invention of the present invention is described in detail.
The present invention proposes a kind of topological structure improving the soft straight transmission system motility of multiterminal, and one of them enforcement is such as schemed
Shown in 1.It figure is the soft straight current conversion station of four ends.Soft straight current conversion station DC side busbar voltage grade is identical and interconnects, theoretical
On to any one current conversion station carry power, AC1～AC8 in figure is communication area, and communication area can be urban distribution network
Independent partitions electrical network, can be one-end substation, it is also possible to be sectionalized busbar.Time properly functioning, chopper 1, chopper 2 two
Can only close one and be connected with current conversion station.Same chopper 3, chopper 4 also can only close one.The like chopper 5/6,
Chopper 7/8 also can only close one of them, it is ensured that current conversion station can only have one to be connected with communication area.Soft straight transmission system
Realize the power equalization of communication area time properly functioning, reduce the targets such as network loss, by the multiterminal quick merit of soft straight realization during fault
Rate is supported.
Described a kind of topological structure improving the soft straight transmission system motility of multiterminal, its motility is each current conversion station
The subregion accessing in two subregions can be selected, four ends are soft directly all run time, can up to 16 kinds subregions by four ends
The mode of soft straight combined running.Three end soft straight run time, can by reach 8 kinds of subregions by the three soft straight combined runnings of end in the way of.
During the soft straight operation in two ends, it is also possible to reach 4 kinds of subregions by the way of the soft straight combined running in two ends.
The method of operation that the soft direct election of aforesaid multiterminal is selected, is mainly determined by the load factor of detection communication area.Main
Wanting target is to equalize the load of subregion, in case of emergency, it is ensured that fault zone can realize quick power and support, simultaneously
It is not resulted in the problems such as other exchange sending end overloads.
Present invention also offers another embodiment as in figure 2 it is shown, communication area AC1/AC2/AC3 and AC6/AC7/AC8
Being all connected to same current conversion station, these three communication area still can only have one to be connected with soft straight current conversion station.Compare the knot of Fig. 1
Structure, structure has carried out further expansion.
The present invention introduces with the structure being applied to two communication area of four ends soft straight transmission system each current conversion station connection
Embodiment, but the invention is not restricted to the four soft straight transmission systems of end, it is also possible to by soft straight, the two ends transmission system of then three ends, same
Time each current conversion station connect exchanging area can be one, it is also possible to be two or three.Such as can apply to the two ends back of the body
The soft soft straight current conversion station straight, each of backrest connects structure of two communication area etc..Any involve a soft straight current conversion station lead to
Cross switch and connect within multiple communication area broadly fall into the scope of the invention.
It should be noted that each element in the present invention, such as current conversion station, direct current, switch, change of current change etc., mostly refer to
Effect element；It is to say, the equivalence element in circuit structure both can be single element, it is also possible to be multiple same elements
Cascade (series, parallel etc.) forms.For any equivalence element in the embodiment of the present invention, it is possible to realize any of said function
Equivalent circuit should all be contained within the protection domain of the embodiment of the present invention.
Finally should be noted that: combine above-described embodiment and only illustrate that technical scheme is not intended to limit.Institute
The those of ordinary skill in genus field is to be understood that: the detailed description of the invention of the present invention can be repaiied by those skilled in the art
Change or equivalent, but these amendments or change are all within the patent requirements protection domain that application is awaited the reply.
Claims (6)
1. the topological structure improving the soft straight transmission system motility of multiterminal, it is characterised in that: each soft straight current conversion station is with many
Individual communication area be connected, controlled the connection of soft straight current conversion station and communication area by AC circuit breaker, it is achieved multiterminal soft directly with not
The connection of same communication area；
When monitoring certain region and needing soft straight power to support, the power of light-load region is carried by multiterminal soft direct express speed
To the region needing power to support.
A kind of topological structure improving the soft straight transmission system motility of multiterminal the most as claimed in claim 1, it is characterised in that: institute
The soft straight current conversion station stated is made up of voltage source converter, including two level block, transformator multiple inverter configuration or modularity
Many level block.
A kind of topological structure improving the soft straight transmission system motility of multiterminal the most as claimed in claim 1, it is characterised in that: institute
The soft straight transmission system of multiterminal stated, applies at urban distribution network, it is achieved the interconnection of multiple partition power grid, is divided by the soft straight realization of multiterminal
The power of district's electrical network is supported.
A kind of topological structure improving the soft straight transmission system motility of multiterminal the most as claimed in claim 3, it is characterised in that: institute
The multiple partition power grid stated are to include the independent partitions electrical network of urban distribution network Clear partition, including one-end substation or segmentation
Bus.
A kind of topological structure improving the soft straight transmission system motility of multiterminal the most as claimed in claim 1, it is characterised in that: institute
The soft straight current conversion station stated and the connection in multiple regions, can only be selected and a friendship by chopper at soft straight current conversion station of each moment
Stream region is connected.
A kind of topological structure improving the soft straight transmission system motility of multiterminal the most as claimed in claim 1, it is characterised in that: institute
The soft straight transmission system of multiterminal stated, including two ends, three ends, four ends or the soft straight transmission system extending to N end, its terminal number with
The number of inverter is identical.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201610547225.8A CN106058908B (en) | 2016-07-12 | 2016-07-12 | A kind of topological structure for improving the soft straight transmission system flexibility of multiterminal |
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| CN201610547225.8A CN106058908B (en) | 2016-07-12 | 2016-07-12 | A kind of topological structure for improving the soft straight transmission system flexibility of multiterminal |
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| CN106058908B CN106058908B (en) | 2018-05-22 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106786717A (en) * | 2016-12-26 | 2017-05-31 | 中国能源建设集团广东省电力设计研究院有限公司 | Control method, device and system between Multi-end flexible direct current transmission Converter Station |
| CN107910885A (en) * | 2017-11-16 | 2018-04-13 | 深圳供电局有限公司 | A kind of slave station outer shroud current control method of Multi-end flexible direct current transmission system |
| CN109687498A (en) * | 2018-12-12 | 2019-04-26 | 国网冀北电力有限公司电力科学研究院 | The bipolar parallel running route back brake system and method for converter station |
| CN112366705A (en) * | 2020-11-16 | 2021-02-12 | 深圳供电局有限公司 | Flexible direct current converter station and backup power automatic switching device time sequence coordination method and system |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106786717A (en) * | 2016-12-26 | 2017-05-31 | 中国能源建设集团广东省电力设计研究院有限公司 | Control method, device and system between Multi-end flexible direct current transmission Converter Station |
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| CN107910885A (en) * | 2017-11-16 | 2018-04-13 | 深圳供电局有限公司 | A kind of slave station outer shroud current control method of Multi-end flexible direct current transmission system |
| CN107910885B (en) * | 2017-11-16 | 2021-03-19 | 深圳供电局有限公司 | Slave station outer ring current control method of multi-terminal flexible direct current transmission system |
| CN109687498A (en) * | 2018-12-12 | 2019-04-26 | 国网冀北电力有限公司电力科学研究院 | The bipolar parallel running route back brake system and method for converter station |
| CN109687498B (en) * | 2018-12-12 | 2021-03-02 | 国网冀北电力有限公司电力科学研究院 | Bipolar parallel operation line switching system and method for converter station |
| CN112366705A (en) * | 2020-11-16 | 2021-02-12 | 深圳供电局有限公司 | Flexible direct current converter station and backup power automatic switching device time sequence coordination method and system |
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| CN106058908B (en) | 2018-05-22 |
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