CN106921172A - A kind of topological structure of flexible ring net controller - Google Patents
A kind of topological structure of flexible ring net controller Download PDFInfo
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- CN106921172A CN106921172A CN201511001333.7A CN201511001333A CN106921172A CN 106921172 A CN106921172 A CN 106921172A CN 201511001333 A CN201511001333 A CN 201511001333A CN 106921172 A CN106921172 A CN 106921172A
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- transverter
- power transformer
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- flexible ring
- ring net
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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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Abstract
The invention provides a kind of topological structure of flexible ring net controller, including converter power transformer, the first transverter and the second transverter；First transverter is directly accessed AC system by converter power transformer incoming transport system, the second transverter；The source side winding of the converter power transformer uses star-like connection, and valve side winding is connected using triangular form；Every phase bridge arm of the first transverter is composed in series by half-bridge submodule；Every phase bridge arm of the second transverter is composed in series by half-bridge submodule and full-bridge submodule, and the quantity ratio of the half-bridge submodule and full-bridge submodule is 1：1.Compared with prior art, a kind of topological structure of flexible ring net controller that the present invention is provided, eliminates one group of converter power transformer and one end earthed system, saves the floor space of flexible ring net controller, realizes compact designed；Using the converter power transformer of single side, the path of DC magnetic bias current, improves the reliability of flexible ring net controller when having blocked zero-sequence current and normal operation.
Description
Technical field
The present invention relates to electric and electronic technical field, and in particular to a kind of topological structure of flexible ring net controller.
Background technology
With the continuous increase of transmission load, the development construction of one-level power network high, electromagnetic looped network is constantly being formed again.It is general at present
Electromagnetic looped network the method for unlinking be Xie Huandianchu install additional AC circuit breaker or carry out sub-area division operation, but the method premise
Condition is the primary condition that power network has been equipped with open loop operation.Open loop operation is difficult in electromagnetic looped network but meet the condition of security constraint
When, can use technologies such as THE UPFC, phase shifter, IPC, controlled series compensations, filled by FACTS
Put adjustment voltage phase angle to eliminate the circulation in electromagnetic looped network, limiting short-circuit current, optimize the internetwork power distribution of high low pressure,
System operation reliability and economy are improved, but such device can not fundamentally solve the problems, such as electromagnetic looped network.Flexible ring network control
Device processed is back-to-back flexible direct current, can realize the quick independent control of active power and reactive power；When AC system breaks down
When, flexible direct current does not provide short circuit current, can promptly isolate failure, and with black starting-up function, to solve the problems, such as electromagnetic looped network
Selected there is provided one kind.
Flexible ring net controller topology general at present is double-sided tape converter power transformer symmetrical monopolar using half-bridge submodule transverter
Flexible ring net controller, but this kind of topological structure has two groups of converter power transformers and two groups of earthed systems, and floor space is larger, it is considered to
The actual installation position of urban distribution network and space limiting factor, it is difficult to apply.It is another to use mixed without converter power transformer symmetrical monopolar
The flexible ring net controller of zygote module transverter, although eliminate two groups of converter power transformers and earthed system, but this kind of topology
There are strict requirements to the symmetrical operation degree of transverter, once the two poles of the earth DC current of transverter has operation deviation, can make soft
Property the output of loop network control device alternating current in there is D.C. magnetic biasing component, cause DC current to inject auto-transformer, in exchange
DC loop-current is formed in bus, the auto-transformer in AC system is poor for the tolerance of long-term DC magnetic bias, there is peace
Full hidden danger.Accordingly, it is desirable to provide a kind of flexible ring net controller for saving floor space and high reliability.
The content of the invention
The need in order to meet prior art, the invention provides a kind of topological structure of flexible ring net controller.
The technical scheme is that：
The controller includes converter power transformer, the first transverter and the second transverter；First transverter passes through change of current transformation
Device incoming transport system, the second transverter is directly accessed AC system；The source side winding of the converter power transformer uses star-like connection,
Valve side winding is connected using triangular form；
Every phase bridge arm of first transverter is composed in series by half-bridge submodule；
Every phase bridge arm of second transverter is composed in series by half-bridge submodule and full-bridge submodule, the half-bridge submodule and full-bridge
The quantity ratio of submodule is 1：1.
Preferably,
When the AC that the converter power transformer is accessed occurs unbalanced fault, converter power transformer isolates the unbalanced fault；
When the AC that second transverter is accessed occurs unbalanced fault, the second transverter isolates the unbalanced fault.
Preferably,
When there is unbalanced fault in the AC that the converter power transformer is accessed, the converter power transformer by primary side side winding and
Secondary side winding is magnetically coupled delivering power, realizes the electric insulation of AC system and straight-flow system；
When the AC that second transverter is accessed occurs unbalanced fault, the second transverter output negative voltage is controlled,
Realize the undistorted symmetrical output of the alternating voltage and alternating current of the second transverter.
Preferably,
When DC line breaks down, the converter power transformer and the second transverter bear DC Line Fault overvoltage.
Preferably,
When DC line breaks down, the converter power transformer is magnetically coupled transmission by primary side side winding and secondary side winding
Power, realizes the electric insulation of AC system and straight-flow system；
When DC line breaks down, second transverter suppresses direct fault current by full-bridge submodule so that this
The DC voltage of two transverters output is reduced to zero, realizes that DC Line Fault is passed through or quick lock.
Compared with immediate prior art, excellent effect of the invention is：
1st, the topological structure of a kind of flexible ring net controller that the present invention is provided, compared to the topology knot of existing flexible ring net controller
Structure eliminates one group of converter power transformer and one end earthed system, saves the floor space of the topological structure of flexible ring net controller,
Realize compact designed；
2nd, a kind of topological structure of flexible ring net controller that the present invention is provided, using the converter power transformer of single side, has blocked zero
The path of DC magnetic bias current, improves the reliability of the topological structure of flexible ring net controller when sequence electric current and normal operation；
3rd, the topological structure of a kind of flexible ring net controller that the present invention is provided, its second transverter using 50% full-bridge submodule and
The mixing bridge arm structure that 50% half-bridge submodule is in series, after it there is AC fault, using the negative voltage for mixing sub-modular structure
Fan-out capability, realizes the undistorted symmetrical output of transverter alternating voltage and electric current；When there is DC system fault, using mixed
Full-bridge submodule in zygote modular structure suppresses to flow through the fault current of its diode, the direct current of control the second transverter output
Pressure drop is zero, it is possible to achieve fault traversing or quick lock, isolated fault.
Brief description of the drawings
The present invention is further described below in conjunction with the accompanying drawings.
Fig. 1：The topological structure schematic diagram of conventional flexible ring net controller；
Fig. 2：A kind of topological structure schematic diagram of flexible ring net controller in the embodiment of the present invention；
Fig. 3：Bias current schematic diagram as long as flexible ring net controller is produced in the embodiment of the present invention；
Fig. 4：DC magnetic bias current path schematic diagram without converter power transformer in the embodiment of the present invention；
Fig. 5：The unilateral change of current becomes blocking DC magnetic bias current path schematic diagram in the embodiment of the present invention；
Fig. 6：There is AC system singlephase earth fault schematic diagram in the embodiment of the present invention；
Fig. 7：There is DC line cathode metal earth fault schematic diagram in the embodiment of the present invention.
Specific embodiment
Embodiments of the invention are described below in detail, the example of the embodiment is shown in the drawings, wherein it is identical from start to finish or
Similar label represents same or similar element or the element with same or like function.Below with reference to Description of Drawings
Embodiment is exemplary, it is intended to for explaining the present invention, and be not considered as limiting the invention.
A kind of embodiment of the topological structure of flexible ring net controller that the present invention is provided is as shown in Fig. 2 be specially：
The topological structure of flexible ring net controller includes converter power transformer, the first transverter and the second transverter in the present embodiment.Its
In,
1st, the first transverter
The first transverter is by converter power transformer incoming transport system in the present embodiment, and the first transverter every phase bridge arm by partly
Bridge submodule is composed in series.
2nd, the second transverter
The second transverter is directly accessed AC system in the present embodiment, and the second transverter every phase bridge arm by half-bridge submodule and complete
Bridge submodule is composed in series, and the quantity ratio of the half-bridge submodule and full-bridge submodule is 1：1.I.e. per phase bridge arm by 50% full-bridge
Module and 50% half-bridge submodule are composed in series.
3rd, converter power transformer
The source side winding of converter power transformer uses star-like connection in the present embodiment, and valve side winding is connected using triangular form.
When power network of the present invention normally runs, there is operation deviation delta I in the two poles of the earth DC current of transverterd, Δ Id=Id2-Id1, wherein
Id2It is negative DC electric current, Id1It is positive DC electric current.But due to converter power transformer for direct current equivalent to open circuit.Therefore
In the absence of DC loop, outlet D.C. magnetic biasing component in the alternating current of flexible ring net controller output will not be made, such as Fig. 3-5 institutes
Show.When in grid collapses, the working method of flexible ring net controller includes：
1st, fault in ac transmission system
As shown in Figure 6：
①：When the AC that converter power transformer is accessed occurs unbalanced fault, converter power transformer isolates the unbalanced fault.
Converter power transformer is magnetically coupled delivering power by primary side side winding and secondary side winding in the present embodiment, realizes exchange system
The electric insulation of system and straight-flow system.
②：When the AC that the second transverter is accessed occurs unbalanced fault, the second transverter isolates the unbalanced fault.
Negative voltage is exported by controlling the second transverter in the present embodiment, the alternating voltage and alternating current of second transverter is realized
Undistorted symmetrical output.
2nd, DC system fault
As shown in fig. 7, when DC line breaks down, converter power transformer and the second transverter bear DC Line Fault overvoltage.
①：When DC line breaks down, converter power transformer is magnetically coupled transmission by primary side side winding and secondary side winding
Power, realizes the electric insulation of AC system and straight-flow system so that DC Line Fault is not delivered to AC.
②：When DC line breaks down, the second transverter suppresses direct fault current by full-bridge submodule so that this
The DC voltage of two transverters output is reduced to zero, realizes that DC Line Fault is passed through or quick lock.
Compared to the topological structure of the flexible ring net controller commonly used shown in Fig. 1, flexible ring net controller in the present embodiment is opened up
Flutter structure and eliminate one group of converter power transformer and earthed system, save floor space, on the one hand using unilateral converter power transformer and
Using the design of mixing sub-modular structure transverter, the reliability of flexible loop network control is improve.
Finally it should be noted that：Described embodiment is only some embodiments of the present application, rather than whole embodiments.
Based on the embodiment in the application, those of ordinary skill in the art obtained under the premise of creative work is not made it is all its
His embodiment, belongs to the scope of the application protection.
Claims (5)
1. a kind of topological structure of flexible ring net controller, it is characterised in that the controller includes that converter power transformer, first are changed
Stream device and the second transverter；First transverter is directly accessed friendship by converter power transformer incoming transport system, the second transverter
Streaming system；The source side winding of the converter power transformer uses star-like connection, and valve side winding is connected using triangular form；
Every phase bridge arm of first transverter is composed in series by half-bridge submodule；
Every phase bridge arm of second transverter is composed in series by half-bridge submodule and full-bridge submodule, the half-bridge submodule and full-bridge
The quantity ratio of submodule is 1：1.
2. a kind of topological structure of flexible ring net controller as claimed in claim 1, it is characterised in that
When the AC that the converter power transformer is accessed occurs unbalanced fault, converter power transformer isolates the unbalanced fault；
When the AC that second transverter is accessed occurs unbalanced fault, the second transverter isolates the unbalanced fault.
3. a kind of topological structure of flexible ring net controller as claimed in claim 2, it is characterised in that
When there is unbalanced fault in the AC that the converter power transformer is accessed, the converter power transformer by primary side side winding and
Secondary side winding is magnetically coupled delivering power, realizes the electric insulation of AC system and straight-flow system；
When the AC that second transverter is accessed occurs unbalanced fault, the second transverter output negative voltage is controlled,
Realize the undistorted symmetrical output of the alternating voltage and alternating current of the second transverter.
4. a kind of topological structure of flexible ring net controller as claimed in claim 1, it is characterised in that
When DC line breaks down, the converter power transformer and the second transverter bear DC Line Fault overvoltage.
5. a kind of topological structure of flexible ring net controller as claimed in claim 4, it is characterised in that
When DC line breaks down, the converter power transformer is magnetically coupled transmission by primary side side winding and secondary side winding
Power, realizes the electric insulation of AC system and straight-flow system；
When DC line breaks down, second transverter suppresses direct fault current by full-bridge submodule so that this
The DC voltage of two transverters output is reduced to zero, realizes that DC Line Fault is passed through or quick lock.
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Cited By (6)
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| CN108963988A (en) * | 2018-06-25 | 2018-12-07 | 全球能源互联网研究院有限公司 | A kind of loop network control device and power distribution network |
| CN109711089A (en) * | 2019-01-15 | 2019-05-03 | 清华大学 | Four port electric energy routers simplify modeling and simulating method |
| WO2020000528A1 (en) * | 2018-06-25 | 2020-01-02 | 全球能源互联网研究院有限公司 | Ring network controller and power distribution network |
| CN112187396A (en) * | 2019-07-05 | 2021-01-05 | 许继集团有限公司 | Communication system and method suitable for flexible direct current converter valve |
| WO2021022949A1 (en) * | 2019-08-02 | 2021-02-11 | 全球能源互联网研究院有限公司 | Looped network controller and control method |
| CN113595128A (en) * | 2021-08-10 | 2021-11-02 | 东南大学 | Flexible ring network controller topology without connection transformer |
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| CN113595128A (en) * | 2021-08-10 | 2021-11-02 | 东南大学 | Flexible ring network controller topology without connection transformer |
| CN113595128B (en) * | 2021-08-10 | 2023-08-22 | 东南大学 | Flexible ring network controller topology without coupling transformer |
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