CN107196325A - It is a kind of by mixed-voltage source type current conversion station constitute without dc-couple type direct current network topology - Google Patents
It is a kind of by mixed-voltage source type current conversion station constitute without dc-couple type direct current network topology Download PDFInfo
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- CN107196325A CN107196325A CN201710227363.2A CN201710227363A CN107196325A CN 107196325 A CN107196325 A CN 107196325A CN 201710227363 A CN201710227363 A CN 201710227363A CN 107196325 A CN107196325 A CN 107196325A
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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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- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
Abstract
The present invention proposes one kind by mixed-voltage source type transverter（Mix MMC or bridge arm alternate conduction transverter AAC）What is constituted is topological without dc-couple type direct current network, include n AC system AC1, AC2 to ACn, n multiwinding transformer T1, T2 are to Tn, wherein n AC system is connected with the primary side of n multiwinding transformer, the secondary side connection mixed-voltage source type converter station of multiwinding transformer, in whole system comprising mixed-voltage source type transverter several, it is 2 mixed-voltage source type transverters respectively in the both sides of every DC line, wherein the nomenclature principle of mixed-voltage source type transverter is x_y, represents connection Tx and Ty and positioned at the current conversion station of Tx sides.Multiterminal element power network topology proposed by the invention can realize that direct current network passes through DC Line Fault without locking and DC side realizes decoupling, and can realize dc circuit breaker（DCCB）, DC/DC converters and flow controller (DC PFC) function.
Description
Technical field
The present invention be it is a kind of by mixed-voltage source type current conversion station constitute without dc-couple type direct current network topology, belong to should
For direct current network and one kind topology of flexible direct-current transmission field, the Topology Structure Design of newly-built direct current network can be applied to.
Background technology
China's energy resources and load center distributed pole are unbalanced, the resource in the exploitation and the whole country of the extensive energy
Distribute rationally and determine that China needs to build remote passway for transmitting electricity, with realize extensive energy resources intensive development and
Most optimum distribution of resources in the whole country.On the other hand, with fossil energy increasingly depleted and improve environmental pressure increasingly
Increase, China or even the world are faced with the strategical adjustment of energy resource structure, and large-scale development and utilization new energy are imperative.
In recent years, with the fast development of distributed power source, the increasingly increase of DC load, energy storage technology is continued to develop, Yi Jizhi
The advantage such as the transmission capacity that possesses of stream power network itself is big, line loss is low, reliability is high, direct current network receives the pass of people again
Note, is the important development direction of following power network.
The advantages of flexible direct current system based on Power Electronic Technique is due to the independent control of its power, without commutation failure,
Become the main trend of direct current network development.MMC is adopted as a kind of new technology of transmission of electricity, the topological structure of current conversion station bridge arm
With sub-module cascade, be greatly reduced with the dynamic voltage balancing requirement triggered always to switching device, voltage class is easily expanded,
It is many that the low waveform quality of output voltage current harmonic content is high, switching frequency and running wastage are low, can be powered to passive network etc.
Advantage, in terms of urban power distribution network increase-volume, the grid-connected, electricity transaction of large-scale wind power, Power System Interconnection, the raising quality of power supply all
There is huge market application value.
Direct current network has many advantages, such as, but the field is brand-new research field, does not have correlation engineering experience, and it develops face
Face many problems, wherein most urgent problem to be solved is how direct current network handles DC Line Fault.Compared to traditional exchange system
System, because the damping of straight-flow system is relatively small, responsive time constant is more much smaller than AC network, and system failure spread speed is more
It hurry up, system control response time requirement is shorter, relay protecting method design difficulty is bigger.Can for the transient fault of DC side
To use the double-thyristor structure of reverse parallel connection, but still need by the breaker of AC for permanent fault
Row isolation, but this method responsiveness is slow, system recovery time is long, and this limits MMC to multiterminal element to a certain extent
Transmission system and the development and application in direct current network field；And present direct current network is in order to ensure the stable operation of power network,
Need many nucleus equipments, such as dc circuit breaker（DCCB）, DC/DC converters, flow controller（DC-PFC）Deng these equipment
Cost it is very high, considerably increase the cost of direct current network, constrain the development of direct current network, therefore, based on it is above-mentioned some, can
To find out, the development of current direct current network still faces many problems.
It is proposed by the invention that be made up of mixed-voltage source type current conversion station is one without dc-couple type direct current network topology
The topological structure that DC Line Fault is passed through without locking kind can be realized, the characteristics of with DC Line Fault is suppressed, and can be realized straight
Flow breaker（DCCB）, DC/DC converters and flow controller (DC-PFC) function, with good future in engineering applications.
The content of the invention
The present invention be it is a kind of by mixed-voltage source type current conversion station constitute without dc-couple type direct current network topology, be a kind of
The New Topological that direct current network passes through DC Line Fault without locking can be achieved.
One kind is provided without direct current coupling it is an object of the invention to overcome the dc-side short-circuit fault in existing direct current network
Mould assembly direct current network topology.
The technical scheme is that：It is proposed by the present invention by mixed-voltage source type current conversion station constitute without dc-couple type
Direct current network topological structure includes n AC system AC1, AC2 to ACn, n multiwinding transformer T1, T2 to Tn, its
Middle n AC system is connected with the primary side of n multiwinding transformer, the secondary side connection mixed-voltage source type of multiwinding transformer
In current conversion station, whole system comprising mixed-voltage source type current conversion station several, be respectively in the both sides of every circuit 2 mixing electricity
Potential source type current conversion station, the wherein nomenclature principle of mixed-voltage source type current conversion station are x_y, represent connection Tx and Ty and positioned at Tx sides
Current conversion station.
Wherein in order to be inverted in view of later stage direct current network trend, trend such as plans at the part in reason, the present invention again
AC system is connected by AC system, shown in the circuit represented such as the dotted line in Fig. 1, between specific different AC systems whether
Whether need alternating current circuit to be connected needs with straight-flow system to be connected depending on direct current by current conversion station with different transformer secondary sides
Study on Power Grid Planning.
Mixed type MMC current conversion stations in the present invention are the bridge arm structure of three-phase six, and each bridge arm is by bridge arm reactor L0、NFIt is individual
Bridge-type submodule FBSM and NHIndividual semi-bridge type submodule HBSM is composed in series, bridge arm bridge arm reactor L in a phases0One end with
AC system a phases are connected, the other end and the N being in seriesFIndividual bridge-type submodule FBSM and NHIndividual semi-bridge type submodule HBSM phases
Even, bridge arm under a phases, the upper and lower bridge arm of b phases, the upper and lower bridge arm connection method of c phases is similar, and the upper bridge arm of a, b, c three-phase is in series
NFThe individual bridge-type submodule FBSM other end, which links together, constitutes positive pole P, a, b, c three-phase of mixed type MMC current conversion stations
The N that is in series of lower bridge armFThe individual bridge-type submodule FBSM other end, which links together, constitutes mixed type MMC current conversion stations
Negative pole N, wherein both positive and negative polarity connect direct current reactor L respectivelydc；Bridge-type submodule FBSM as described above, it is characterised in that：Bag
Include four all-controlling power electronics device T1, T2, T3, T4, four diode D1, D2, D3, D4, an electric capacity C；Full-control type electricity
Power electronic device T1 colelctor electrode is connected with diode D1 negative pole, all-controlling power electronics device T1 emitter stage and diode
D1 positive pole is connected, i.e. T1 and D1 reverse parallel connections, similarly, and T2 and D2, T3 and D3, T4 and D4 use same way reverse parallel connection,
T1 emitter stage is connected with T3 colelctor electrode constitutes bridge-type submodule FBSM positive pole, T2 emitter stage and T4 colelctor electrode phase
The negative pole of bridge-type submodule is even constituted, T1 colelctor electrode is connected with T2 colelctor electrode and is connected in C positive pole, T3 emitter stage
It is connected with T4 emitter stage and connects in C negative；Semi-bridge type submodule HBSM as described above, it is characterised in that：Including two
All-controlling power electronics device T1, T2, two diode D1, D2, an electric capacity C；All-controlling power electronics device T1 current collection
Pole is connected with diode D1 negative pole, and all-controlling power electronics device T1 emitter stage is connected with diode D1 positive pole, i.e. T1
With D1 reverse parallel connections, similarly, T2 and D2 use same way reverse parallel connection, and T1 emitter stage is connected composition with T2 colelctor electrode partly
Bridge type submodule HBSM positive pole, T2 emitter stage is connected with electric capacity C negative pole constitutes the negative pole of semi-bridge type submodule, T1 collection
Electrode is connected with C positive pole；N as described aboveFIndividual bridge-type submodule FBSM cascaded structure, it is characterised in that：A, b, c tri-
The N that the upper bridge arm of phase is in seriesFN in individual bridge-type submodule FBSMFThe both positive and negative polarity of individual bridge-type submodule is sequentially connected,
N described in claim 3,4HIndividual semi-bridge type submodule HBSM cascaded structure is identical with bridge-type submodule, and most latter two is gone here and there
It is coupled structure and bridge arm reactor L0It is composed in series a bridge arm.
Bridge arm alternate conduction transverter AAC of the present invention is the bridge arm structure of three-phase six, and each bridge arm is by NFIndividual full-bridge
Type submodule FBSM and N0The individual IGBT with anti-paralleled diode is composed in series, the N being in series in a phases in bridge armFIndividual bridge-type
Submodule FBSM is connected with AC system a phases, the FBSM other end and N0The individual IGBT with anti-paralleled diode is connected, under a phases
Bridge arm, the upper and lower bridge arm of b phases, the upper and lower bridge arm connection method of c phases is similar, the N that the upper bridge arm of a, b, c three-phase is in seriesFIt is individual complete
Bridge type submodule FBSM and N0The individual IGBT with the anti-paralleled diode other end, which links together, constitutes the positive pole P of current conversion station,
The N that the lower bridge arm of a, b, c three-phase is in seriesFIndividual bridge-type submodule FBSM and N0The individual IGBT's with anti-paralleled diode is another
One end, which links together, constitutes the negative pole N of current conversion station, and wherein both positive and negative polarity connects direct current reactor L respectivelydc；Band as described above is anti-
The IGBT of parallel diode, it is characterised in that：Including all-controlling power electronics device a T2, a diode D；Full-control type electricity
Power electronic device T and diode D inverse parallels；N as described aboveFIndividual bridge-type submodule FBSM cascaded structure, its feature exists
In：The N that the upper bridge arm of a, b, c three-phase is in seriesFN in individual bridge-type submodule FBSMFThe both positive and negative polarity of individual bridge-type submodule
It is sequentially connected.
The present invention, which takes full advantage of mixed type MMC and bridge arm alternate conduction transverter AAC, can realize that direct current is passed through in no locking
The ability of failure and alternating current-direct current side voltage decoupling, when DC Line Fault occurs on circuit, the mixed type MMC current conversion stations of circuit both sides
The DC Line Fault processing of faulty line can be realized, and transverter is without locking, therefore the current conversion station of remaining circuit can be just
Often work, therefore can realize that the decoupling between each current conversion station of DC side is run so that thus the direct current network of topology composition is
Without dc-couple type direct current network.
Brief description of the drawings
Patent of the present invention is further described with reference to the accompanying drawings and detailed description.
Fig. 1 for the present invention by mix MMC constitute without dc-couple type direct current network topology diagram.
Fig. 2 is mixed type MMC topology diagrams.
Fig. 3 is bridge-type sub-modular structure figure.
Fig. 4 is semi-bridge type sub-modular structure figure.
Fig. 5 is bridge arm alternate conduction transverter AAC topological diagrams.
Embodiment
Embodiment 1：Dc circuit breaker（DCCB）
Because mixed type MMC can realize that DC Line Fault is passed through in no locking, so when DC Line Fault occurs in DC line, due to
Mixed type MMC presence, can be considered as between DCCB, such as 1_2 and 2_1 current conversion stations occurring the bipolar short trouble of DC side,
Original MMC current conversion stations are both needed to locking stoppage in transit, but for mixed type MMC, because its FBSM possesses negative level output energy
Power, it is possible to realized in the bipolar short trouble of generation DC side and pass through DC Line Fault without locking, and do not influence other to change
The normal operation at station is flowed, when the bipolar short trouble of DC side can occur between 1_2 and 2_1 current conversion stations for 1_k and 1_n in such as figure just
Often operation, and 1_2 and 2_1 current conversion stations can carry out reactive-load compensation as STATCOM operations.
Embodiment 2：DC/DC converters
For one end in direct current network, wherein with the AC system AC1 in Fig. 1, multiwinding transformer T1 and current conversion station 1_2 ~
1_n is constituted, and wherein current conversion station 1_2 ~ 1_n is mixed type MMC due to it, belongs to voltage source converter, can be used and be determined direct current
DC voltage value between voltage-controlled system, and different stations can be different, it is possible to realize the function of DC voltage conversion, in addition
As can be seen that current conversion station 1_2, multiwinding transformer T1 and current conversion station 1_k can constitute DC-AC-DC structure, with existing DC/DC
Transformer configuration is consistent, so proposed by the invention possess direct current change by what mixing MMC was constituted without dc-couple direct current network
Press function, you can run as DC/DC converters.
Embodiment 3：Flow controller (DC-PFC)
As DC/DC converter cases, because the current conversion station in direct current network uses voltage-source type current conversion station, it is except tool
It is standby to determine outside the ability of DC voltage, it is also equipped with determining the ability of active power, such as 1_2 and the current conversion stations of 2_1 two, in normal operation,
One end uses constant DC voltage control, and the other end so can both have been realized straight between different stations using active power controller is determined
Stream magnitude of voltage obtains different, can also realize the control of trend on every circuit, therefore the topology possesses the function of flow controller.
Claims (3)
1. one kind is by mixed-voltage source type transverter（Mix MMC or bridge arm alternate conduction transverter AAC）Constitute without direct current coupling
Mould assembly direct current network topology, it is characterised in that：Include n AC system AC1, AC2 to ACn, n multiwinding transformer T1,
T2 to Tn, wherein n AC system is connected with the primary side of n multiwinding transformer, and the secondary side connection of multiwinding transformer is mixed
Close voltage source converter（Mix MMC current conversion stations or bridge arm alternate conduction transverter AAC current conversion stations）, comprising mixed in whole system
Close voltage source converter several, be 2 mixed-voltage source type transverters respectively in the both sides of every circuit, wherein mixing electricity
The nomenclature principle of potential source type transverter is x_y, represents connection Tx and Ty and positioned at the current conversion station of Tx sides, which part exchange system
System is connected by alternating current circuit.
2. mixed type MMC current conversion stations as claimed in claim 1, it is characterised in that：It is the bridge arm structure of three-phase six, each bridge arm
By bridge arm reactor L0、NFIndividual bridge-type submodule FBSM and NHIndividual semi-bridge type submodule HBSM is composed in series, in a phases in bridge arm
Bridge arm reactor L0One end be connected with AC system a phases, the other end and the N being in seriesFIndividual bridge-type submodule FBSM and NH
Individual semi-bridge type submodule HBSM is connected, and bridge arm under a phases, the upper and lower bridge arm of b phases, the upper and lower bridge arm connection method of c phases is similar, a, b, c
The N that the upper bridge arm of three-phase is in seriesFThe individual bridge-type submodule FBSM other end, which links together, constitutes the mixed type MMC changes of current
The N that the lower bridge arm for positive pole P, a, b, c three-phase stood is in seriesFThe individual bridge-type submodule FBSM other end links together structure
Into the negative pole N of mixed type MMC current conversion stations, wherein both positive and negative polarity connects direct current reactor L respectivelydc；Bridge-type submodule as described above
Block FBSM, it is characterised in that：Including four all-controlling power electronics device T1, T2, T3, T4, four diode D1, D2, D3,
D4, an electric capacity C；All-controlling power electronics device T1 colelctor electrode is connected with diode D1 negative pole, full-control type power electronic
Device T1 emitter stage is connected with diode D1 positive pole, i.e. T1 and D1 reverse parallel connections, similarly, T2 and D2, T3 and D3, T4 and D4
Using same way reverse parallel connection, T1 emitter stage is connected with T3 colelctor electrode constitutes bridge-type submodule FBSM positive pole, T2
Emitter stage be connected with T4 colelctor electrode constitute bridge-type submodule negative pole, T1 colelctor electrode be connected with T2 colelctor electrode and in
C positive pole is connected, and T3 emitter stage is connected with T4 emitter stage and connected in C negative；Semi-bridge type submodule as described above
HBSM, it is characterised in that：Including two all-controlling power electronics device T1, T2, two diode D1, D2, an electric capacity C；Entirely
Control type power electronic device T1 colelctor electrode is connected with diode D1 negative pole, all-controlling power electronics device T1 emitter stage with
Diode D1 positive pole is connected, i.e. T1 and D1 reverse parallel connections, similarly, and T2 and D2 use same way reverse parallel connection, T1 transmitting
Pole is connected with T2 colelctor electrode constitutes semi-bridge type submodule HBSM positive pole, and T2 emitter stage is connected composition with electric capacity C negative pole
The negative pole of semi-bridge type submodule, T1 colelctor electrode is connected with C positive pole；N as described aboveFIndividual bridge-type submodule FBSM string
It is coupled structure, it is characterised in that：The N that the upper bridge arm of a, b, c three-phase is in seriesFN in individual bridge-type submodule FBSMFIndividual full-bridge
The both positive and negative polarity of type submodule is sequentially connected, the N described in claim 3,4HIndividual semi-bridge type submodule HBSM cascaded structure with it is complete
Bridge type submodule is identical, last two cascaded structures of FBSM and HBSM and bridge arm reactor L0It is composed in series a bridge arm.
3. bridge arm alternate conduction transverter AAC as claimed in claim 1, it is characterised in that：It is the bridge arm structure of three-phase six, often
Individual bridge arm is by NFIndividual bridge-type submodule FBSM and N0The individual IGBT with anti-paralleled diode is composed in series, and is connected in a phases in bridge arm
NFIndividual bridge-type submodule FBSM is connected with AC system a phases, the FBSM other end and N0It is individual with anti-paralleled diode
IGBT is connected, and bridge arm under a phases, the upper and lower bridge arm of b phases, the upper and lower bridge arm connection method of c phases is similar, the upper bridge arm string of a, b, c three-phase
The N of connectionFIndividual bridge-type submodule FBSM and N0The individual IGBT with the anti-paralleled diode other end composition that links together is changed
Flow the N that the lower bridge arm of positive pole P, a, b, c three-phase at station is in seriesFIndividual bridge-type submodule FBSM and N0The individual pole of band inverse parallel two
The IGBT of the pipe other end, which links together, constitutes the negative pole N of current conversion station, and wherein both positive and negative polarity connects direct current reactor L respectivelydc；Such as
The upper described IGBT with anti-paralleled diode, it is characterised in that：Including an all-controlling power electronics device T2, two poles
Pipe D；All-controlling power electronics device T and diode D inverse parallels；N as described aboveFIndividual bridge-type submodule FBSM tandem junction
Structure, it is characterised in that：The N that the upper bridge arm of a, b, c three-phase is in seriesFN in individual bridge-type submodule FBSMFIndividual bridge-type
The both positive and negative polarity of module is sequentially connected.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710227363.2A CN107196325A (en) | 2017-04-10 | 2017-04-10 | It is a kind of by mixed-voltage source type current conversion station constitute without dc-couple type direct current network topology |
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| CN201710227363.2A CN107196325A (en) | 2017-04-10 | 2017-04-10 | It is a kind of by mixed-voltage source type current conversion station constitute without dc-couple type direct current network topology |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109586328A (en) * | 2018-11-20 | 2019-04-05 | 国网重庆市电力公司电力科学研究院 | Trend can two-way flow economical single-ended cascade Hybrid HVDC system |
| CN112039361A (en) * | 2020-09-04 | 2020-12-04 | 华北电力大学（保定） | MMC sub-module and MMC latch-free low-voltage fault ride-through method applying same |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109586328A (en) * | 2018-11-20 | 2019-04-05 | 国网重庆市电力公司电力科学研究院 | Trend can two-way flow economical single-ended cascade Hybrid HVDC system |
| CN109586328B (en) * | 2018-11-20 | 2022-05-31 | 国网重庆市电力公司电力科学研究院 | Economical single-end cascade hybrid direct-current power transmission system with bidirectional flowing power flow |
| CN112039361A (en) * | 2020-09-04 | 2020-12-04 | 华北电力大学（保定） | MMC sub-module and MMC latch-free low-voltage fault ride-through method applying same |
| CN112039361B (en) * | 2020-09-04 | 2023-09-01 | 华北电力大学（保定） | MMC sub-module and MMC blocking-free low-voltage fault ride-through method using same |
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Application publication date: 20170922 |