CN104767227B - A kind of intelligent distribution network transformation device busbar flow controller - Google Patents
A kind of intelligent distribution network transformation device busbar flow controller Download PDFInfo
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- CN104767227B CN104767227B CN201510190605.6A CN201510190605A CN104767227B CN 104767227 B CN104767227 B CN 104767227B CN 201510190605 A CN201510190605 A CN 201510190605A CN 104767227 B CN104767227 B CN 104767227B
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- 230000009466 transformation Effects 0.000 title claims abstract description 18
- 239000003990 capacitor Substances 0.000 claims description 4
- 230000005611 electricity Effects 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 3
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- CUZMQPZYCDIHQL-VCTVXEGHSA-L calcium;(2s)-1-[(2s)-3-[(2r)-2-(cyclohexanecarbonylamino)propanoyl]sulfanyl-2-methylpropanoyl]pyrrolidine-2-carboxylate Chemical group [Ca+2].N([C@H](C)C(=O)SC[C@@H](C)C(=O)N1[C@@H](CCC1)C([O-])=O)C(=O)C1CCCCC1.N([C@H](C)C(=O)SC[C@@H](C)C(=O)N1[C@@H](CCC1)C([O-])=O)C(=O)C1CCCCC1 CUZMQPZYCDIHQL-VCTVXEGHSA-L 0.000 description 1
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- 238000004519 manufacturing process Methods 0.000 description 1
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Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/483—Converters with outputs that each can have more than two voltages levels
- H02M7/4835—Converters with outputs that each can have more than two voltages levels comprising two or more cells, each including a switchable capacitor, the capacitors having a nominal charge voltage which corresponds to a given fraction of the input voltage, and the capacitors being selectively connected in series to determine the instantaneous output voltage
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
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- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
The present invention relates to a kind of intelligent distribution network transformation device busbar flow controller, the busbar flow controller includes H-VSC converters based on LCL-MMC and L-VSC converters and the multiphase type commutator transformer be isolated based on MMC and intermediate frequency；The H-VSC transverters exchange side accesses high voltage AC bus, and DC side parallel accesses high voltage dc bus；The L-VSC transverters exchange side accesses high voltage AC bus, and DC side parallel accesses high voltage dc bus；The commutator transformer includes high-pressure side H-VSC transverters, low-pressure side L-VSC transverters and midfrequent AC transformer group；The high-pressure side H-VSC transverters, exchange side series connection midfrequent AC transformer, DC side series connection high voltage dc bus.The new structure that the busbar flow controller of the present invention is provided, convenient for the interconnection of different voltages grade alternating current-direct current hybrid power grid, and transformation is coordinated in active power mixing between realizing different grade of rated voltage alternating current-direct current busbares, is provided simultaneously with the idle decoupling control function of high-low pressure exchange side.
Description
Technical field
It is that a kind of intelligent distribution network transformation device is " female the present invention relates to large-power flexible VSC transformation and direct current transformation technology
Line flow controller ".
Background technology
The following power distribution network will be extensive interconnection, height intelligence, open interactive " energy internet " main carriers, can be with
Realize the optimization of production of energy, transmission, dispatching, conversion, consumption in wide scope.In addition to undertake electric energy dispatching task it
Outside, the following power distribution network also needs to realize the exchange and distribution of the energy in region, and meets the need of distributed generation resource access and consumption
It asks.
Existing distribution net work structure is also to rely on traditionally grade AC network progress electric power and mutually transmits and adjust, and hands over
Galvanic electricity net transmittability depends on system operation mode, especially contains high permeability wind-powered electricity generation, solar power generation and a large amount of electricity
The localized power distribution net of electrical automobile would become hard to realize that power flexible is adjusted.In contrast, DC distribution net can effectively improve power supply
Capacity and power quality, quickly independently control active power, and access regenerative resource is flexible, convenient etc..Therefore, the following distribution
Interconnection will realize that the different voltages grade of AC distribution net, DC distribution net and alternating current-direct current mixing power distribution network interconnects to net extensively, with
Conventional AC realizes that power flexible is adjusted for network support by direct current, to coordinate the lance between bulk power grid and distributed generation resource
Shield.
In view of the deficiencies of the prior art, the present invention provides a kind of based on the interconnection of multi-voltage grade alternating current-direct current hybrid power distribution network
The busbar flow controller (BPFC) of application.The busbar flow controller is by the pass as alternating current-direct current hybrid flexibility Power System Interconnection
Key support equipment breaks through current conventional AC distribution net work structure, meets the following alternating current-direct current hybrid intelligent distribution network interconnection hair
Exhibition demand, while combining with the communication technology and constructing a kind of completely new multi-level alternating current-direct current hybrid power distribution network framework, it realizes
Multi-level distributed new interconnects in region.
Invention content
The present invention relates to a kind of intelligent distribution network transformation device busbar flow controllers.Include the H-VSC based on LCL-MMC
Converter and L-VSC converters and the multiphase type commutator transformer being isolated based on MMC and intermediate frequency；
The H-VSC converters include high-pressure side LCL circuits and high-pressure side VSC translation circuits；
The L-VSC converters include low-pressure side LCL circuits and low-pressure side VSC translation circuits；
The commutator transformer includes that high-pressure side H-VSC translation circuits, low-pressure side L-VSC translation circuits and midfrequent AC become
Depressor group；
After the high-pressure side VSC translation circuits exchange side is by tandem high pressure side LCL circuits, parallel connection access high-pressure side exchange
Busbar；The high-pressure side VSC translation circuit DC side parallels access high-pressure side DC bus；
After the low-pressure side VSC translation circuits exchange side is by low-pressure side LCL circuits of connecting, parallel connection access low-pressure side exchange
Busbar；The low-pressure side VSC translation circuit DC side parallels access low-pressure side DC bus；
The high-pressure side H-VSC translation circuit exchange side series connection midfrequent AC transformer group, DC side series connection high-pressure side
DC bus；
The low-pressure side L-VSC translation circuit exchange side series connection midfrequent AC transformer group, DC side series connection low-pressure side
DC bus.
Further, LCL circuits in high-pressure side are made of six inductance of three-phase and three capacitances, per mutually by two inductance and one
A capacitance；Two inductance series connection in per phase, is connected in parallel with a capacitor, three capacitance star-like connections among two inductance；Per phase
In one in two inductance be connected with high voltage AC bus three, another and the high-pressure side VSC translation circuit three-phase changes of current fill
The upper and lower bridge arm midpoint connection set.
Further, VSC translation circuits in high-pressure side are made of six bridge arms of three-phase, each bridge arm include reactor and
n5The identical submodule of a structure；The n5One end passes through reactor and another bridge arm after the identical sub-module cascade of a structure
Reactor and LCL circuits connection, the other end are connect with high-pressure side DC bus；The three-phase current converter is whole simultaneously
Connection.
Further, H-VSC translation circuits in high-pressure side are made of 2n bridge arm of n phases, and each bridge arm includes a reactor
And n8The identical submodule of a structure is one group per 4 bridge arms of two-phase, total n/2 groups；The n8The identical submodule grade of a structure
After connection one end by reactor connect with the reactor of another bridge arm and midfrequent AC transformer group in transformer be connected, it is another
End is connected with high-pressure side DC bus；Wherein, n is even number.
Further, midfrequent AC transformer group is made of m identical transformers, m transformers connected in parallel operation；It is described
Transformer primary side connects high-pressure side H-VSC translation circuits in midfrequent AC transformer group, and secondary side connects low-pressure side L-VSC and becomes
Change circuit；Wherein, m=n/2, n are the number of phases of high-pressure side H-VSC translation circuits.
Further, low-pressure side L-VSC translation circuits, it is identical as the structure of high-pressure side H-VSC translation circuits, by n
2n bridge arm of phase is constituted, and each bridge arm includes a reactor and n9The identical submodule of a structure is one per 4 bridge arms of two-phase
Group, total n/2 groups；The n9After the identical sub-module cascade of a structure one end by the reactor of reactor and another bridge arm and
It is connected with transformer in midfrequent AC transformer group, the other end is connected with low-pressure side DC bus；Wherein, n is even number.
Further, low-pressure side VSC translation circuits are identical as high-pressure side VSC translation circuit structures, by six bridge arms of three-phase
It constitutes, each bridge arm includes a reactor and n7The identical submodule of a structure；The n7The identical sub-module cascade of a structure
One end is connect by reactor with the reactor of another bridge arm and the low-pressure side LCL circuits afterwards, and the other end is straight with low-pressure side
Flow busbar connection；The three-phase current converter is whole in parallel.
Further, low-pressure side LCL circuit structures are identical as high-pressure side LCL circuit structures, by six inductance of three-phase and three
A capacitance is constituted, per mutually by two inductance and a capacitance；Two inductance series connection in per phase, the parallel connection one among two inductance
A capacitance, three capacitance star-like connections；One in two inductance in per phase is connected with low-pressure side ac bus three, another
A upper and lower bridge arm midpoint with low-pressure side VSC translation circuit three-phase converting means is connect.
Further, the submodule includes semi-bridge type and bridge-type；The semi-bridge type submodule is by 1 bridge arm and 1
Capacitance parallel connection is constituted；The bridge-type submodule is made of 2 bridge arms and 1 capacitance parallel connection；The bridge arm includes 2 series connection
IGBT module, each IGBT module include the diode of 1 IGBT and 1 reverse parallel connection.
Description of the drawings
Fig. 1 is a kind of basic system structure of intelligent distribution network transformation device busbar flow controller provided by the invention
Figure；
Fig. 2 is a kind of system structure circuit of intelligent distribution network transformation device busbar flow controller provided by the invention
Figure；
Fig. 3 is semi-bridge type of MMC in a kind of intelligent distribution network transformation device busbar flow controller provided by the invention
Function structure chart；
Fig. 4 is bridge-type of MMC in a kind of intelligent distribution network transformation device busbar flow controller provided by the invention
Function structure chart.
Specific implementation mode
Below in conjunction with attached drawing, the forgoing and additional technical features and advantages are described in more detail.
As shown in fig.1, it is basic system structure figure of the present invention.Include the H-VSC converters (1) based on LCL-MMC
And L-VSC converters (2) and the multiphase type commutator transformer (3) be isolated based on MMC and intermediate frequency；H-VSC converters (1) exchange side
High-pressure side ac bus is accessed, DC side parallel accesses high-pressure side DC bus；L-VSC converters (2) exchange side accesses low pressure
Side ac bus, DC side parallel access low-pressure side DC bus；Commutator transformer (3) includes high-pressure side H-VSC translation circuits
(8), low-pressure side L-VSC translation circuits (9) and midfrequent AC transformer group (10)；High-pressure side H-VSC translation circuits (8) exchange side
Midfrequent AC transformer group of connecting (10), DC side parallel connect high-pressure side DC bus；Low-pressure side L-VSC translation circuits (9) are handed over
Side series connection midfrequent AC transformer group (10) is flowed, DC side parallel connects low-pressure side DC bus.
As shown in fig.2, it is present system structural circuit figure.The H-VSC converters (1), L-VSC converters
(2), high-pressure side H-VSC translation circuits (8), low-pressure side L-VSC translation circuits (9) are based on MMC submodules structure, MMC submodules
Block includes semi-bridge type and bridge-type.
High-pressure side LCL circuits (4) are made of six inductance of three-phase and three capacitances, per mutually by two inductance and an electricity
Hold；Two inductance series connection in per phase, is connected in parallel with a capacitor, three capacitance star-like connections among two inductance；High-pressure side LCL
Inductance 1,2,3 in circuit (4) is connected with high voltage AC bus three respectively, the inductance 4,5,6 in circuit (4) respectively with high pressure
The upper and lower bridge arm midpoint of side MMC-VSC translation circuits (5) three-phase current converter connects；
High-pressure side MMC-VSC translation circuits (5) are made of six bridge arms of three-phase, and each bridge arm includes a reactor and n5
The identical submodule of a structure；The n5One end passes through reactor and the high-pressure side after the identical sub-module cascade of a structure
LCL circuits (4) connect；Specifically, n5Exit 1 and 2 after the identical sub-module cascade of a structure, successively with front and back module level
Connection, then with a reactor bridge arm in series, the series connection of upper and lower two bridge arms constitutes 1 phase converter circuit, 3 phase changes of current electricity
Road is whole in parallel, and draws the high straightening that high-pressure side MMC-VSC translation circuits (5) are drawn with high-pressure side H-VSC translation circuits (8)
Flow busbar connection；Upper and lower bridge arm midpoint is accessed in high-pressure side LCL circuits (4)；
High-pressure side H-VSC translation circuits (8) are made of n (n is even number) 2n bridge arm of phase, and each bridge arm includes a reactance
Device and n8The identical submodule of a structure；N circuitry phases are divided into n/2 groups, every group by two-phase and there are 4 bridge arms to constitute, such as the 1st
Bridge arm constitutes a phase with the 1st ' bridge arm, and Bridge 2 arm constitutes a phase with the 2nd ' bridge arm, this two-phase converter circuit is in parallel, and parallel connection is drawn
Line constitutes one group and is connect with the 1st transformer in midfrequent AC transformer group (10) as high-pressure side DC bus, two-phase；It is high
Press the circuit connecting mode of n/2 groups in side H-VSC translation circuits (8) all as described above.Two-phase in specific one group, a phase are the
After Bridge 1 arm sub-module cascade one end connect with the reactor after the 1st ' bridge arm sub-module cascade by reactor again with midfrequent AC
1 line of transformer 1 is connected in transformer group (10), and mutually another both ends are connected with high-pressure side DC bus for this；Another phase is Bridge 2
One end is connect by reactor with the reactor after the 2nd ' bridge arm sub-module cascade after arm sub-module cascade becomes with midfrequent AC again
2 lines are connected in transformer 1 in depressor group (10)；Mutually another both ends are connected with high-pressure side DC bus for this.N/2 group circuits connect phase
Together, when being connected in the n-th/2 group two, a phase passes through reactor and (n-1) ' for one end after the (n-1)th bridge arm sub-module cascade
Reactor connection after bridge arm sub-module cascade is connected with n-1 lines in transformer m in midfrequent AC transformer group (10) again, this
Mutually another both ends are connected with high-pressure side DC bus；Another phase passes through reactor and the n-th ' for one end after the n-th bridge arm sub-module cascade
Reactor connection after bridge arm sub-module cascade is connected with n lines in transformer m in high-pressure side LCL circuits (4) again, this mutually another two
End is connected with high-pressure side DC bus；
Midfrequent AC transformer group (10) is made of m identical transformers, and m transformers connected in parallel runs (m=n/2, n
For the number of phases of high-pressure side H-VSC translation circuits (8)).Specific the 1st bar of line of 1 left end of transformer that be connected as is converted with high-pressure side H-VSC
Reactor after (8) Bridge 1 arm sub-module cascade of circuit and the reactor connection after the 1st ' bridge arm sub-module cascade, transformer 1
The 2nd bar of line of left end and the reactor and the 2nd ' bridge arm submodule after (8) Bridge 2 arm sub-module cascade of high-pressure side H-VSC translation circuits
Reactor connection after block cascade；The the 1st ' bar of line of 1 right end of transformer and (9) Bridge 1 arm submodule of low-pressure side L-VSC translation circuits
Reactor connection after reactor and the 1st ' bridge arm sub-module cascade after cascade, transformer 1 right end the 2nd ' article of line and low-pressure side
Reactor after (9) Bridge 2 arm sub-module cascade of L-VSC translation circuits and the reactor after the 2nd ' bridge arm sub-module cascade connect
It connects.The connection type of M transformer is as described above, (n-1)th bar of line of transformer m left ends and high-pressure side H-VSC translation circuits (8) the
Reactor after n-1 bridge arm sub-module cascades and the reactor connection after (n-1) ' bridge arm sub-module cascade；Transformer m left ends
Nth bar line and the reactor and the n-th ' bridge arm submodule grade after (8) n-th bridge arm sub-module cascade of high-pressure side H-VSC translation circuits
Reactor connection after connection；Transformer m right ends (n-1) ' bar line and (9) (n-1)th bridge arm submodule of low-pressure side L-VSC translation circuits
Reactor after block cascade and the reactor connection after (n-1) ' bridge arm sub-module cascade；Transformer m right end nth bar lines with it is low
Press the reactor after (9) n-th bridge arm sub-module cascade of side L-VSC translation circuits and the reactor after the n-th ' bridge arm sub-module cascade
Connection；
Low-pressure side L-VSC translation circuits (9), identical as the structure of high-pressure side H-VSC translation circuits (8), by n, (n is even
Number) 2n bridge arm composition of phase, each bridge arm includes a reactor and n9The identical submodule of a structure；N circuitry phases are divided into
N/2 groups, every group is two-phase and has 4 bridge arms to constitute, and such as Bridge 1 arm and the 1st ' bridge arm constitute a phase, Bridge 2 arm and the 2nd ' bridge arm
A phase is constituted, this two-phase converter circuit is in parallel, and as low-pressure side DC bus, two-phase constitutes one group and handed over intermediate frequency lead-out wire in parallel
The the 1st ' a transformer connection in convertor transformer group (10)；The circuit side connector of n/2 groups in low-pressure side L-VSC translation circuits (9)
Formula is all as described above.Two-phase in specific one group, a phase pass through reactor and the 1st ' bridge for one end after Bridge 1 arm sub-module cascade
Reactor connection after arm sub-module cascade is connected with 1 ' line of transformer 1 in midfrequent AC transformer group (10) again, this phase
Another both ends end is connected with low-pressure side DC bus；Another phase passes through reactor and the 2nd ' for one end after Bridge 2 arm sub-module cascade
Reactor connection after bridge arm sub-module cascade is connected with 2 ' lines in transformer 1 in midfrequent AC transformer group (10) again；This
Mutually another both ends are connected with low-pressure side DC bus.The connection of n/2 group circuits is identical, and to when the n-th/2 group of connection, a phase is the (n-1)th bridge
One end is connect by reactor with the reactor after (n-1) ' bridge arm sub-module cascade after arm sub-module cascade hands over intermediate frequency again
N-1 lines are connected in transformer m in convertor transformer group (10), and mutually another both ends are connected with low-pressure side DC bus for this；Another phase is
One end is connect by reactor with the reactor after the n-th ' bridge arm sub-module cascade after n-th bridge arm sub-module cascade hands over intermediate frequency again
N ' lines are connected in transformer m in convertor transformer group (10), and mutually another both ends are connected with low-pressure side DC bus for this；
Low-pressure side VSC translation circuits (7) are identical as high-pressure side VSC translation circuits (5) structure, by six bridge arm structures of three-phase
At each bridge arm includes a reactor and n7The identical submodule of a structure；After the sub-module cascade by reactor with
Low-pressure side LCL circuits (6) connection；Specifically, the exit 1 and 2 of submodule, successively with front and back module-cascade, then with
One reactor bridge arm in series, upper and lower two bridge arms series connection constitute 1 phase converter circuit, and 3 phase converter circuits are whole simultaneously
Connection, and draw low-pressure side VSC translation circuits (7) and connect with the low-voltage direct busbar that low-pressure side L-VSC translation circuits (9) are drawn.
Upper and lower bridge arm midpoint is accessed in low-pressure side LCL circuits (6)；
Low-pressure side LCL circuit (6) structures are identical as high-pressure side LCL circuits (4) structure, by six inductance of three-phase and three electricity
Hold and constitute, per mutually by two inductance and a capacitance；Two inductance series connection in per phase, an electricity in parallel among two inductance
Hold, three capacitance star-like connections；Inductance 1,2,3 in low-pressure side LCL circuits (6) is connected with low-voltage alternating-current busbar three respectively,
Inductance 4,5,6 in low-pressure side LCL circuits (6) is connect with the upper and lower bridge arm midpoint of transverter (7) three-phase converter circuit respectively.
As shown in fig.3, it is the semi-bridge type sub-modular structure figure of MMC of the present invention.Wherein semi-bridge type submodule is by 1 bridge
Arm and 1 capacitance parallel connection are constituted；Bridge arm includes 2 series IGBT modules；Each IGBT module includes 1 IGBT and 1 reversed
Diode in parallel；Bridge arm midpoint exit 1, lower IGBT emitters exit 2.
As shown in fig.4, it is the bridge-type sub-modular structure figure of MMC of the present invention.Wherein bridge-type submodule is by 2 bridges
Arm and 1 capacitance parallel connection are constituted；Each bridge arm includes 2 series IGBT modules；Each IGBT module includes 1 IGBT and 1
The diode of reverse parallel connection；Distinguish exit 1 and end 2 in two bridge arm midpoints.
The foregoing is merely presently preferred embodiments of the present invention, is merely illustrative and not restrictive for the invention.
Those skilled in the art understand that many changes can be carried out in the spirit and scope defined by invention claim to it, change,
It is even equivalent, but fall in protection scope of the present invention.
Claims (6)
1. a kind of intelligent distribution network transformation device busbar flow controller, which is characterized in that the busbar flow controller packet
The multiphase type direct current for including H-VSC converters (1) and L-VSC converters (2) based on LCL-MMC and being isolated based on MMC and intermediate frequency
Transformer (3)；
The H-VSC converters (1) include high-pressure side LCL circuits (4) and high-pressure side VSC translation circuits (5)；
The L-VSC converters (2) include low-pressure side LCL circuits (6) and low-pressure side VSC translation circuits (7)；
The commutator transformer (3) includes high-pressure side H-VSC translation circuits (8), low-pressure side L-VSC translation circuits (9) and intermediate frequency
AC transformer group (10)；
After high-pressure side VSC translation circuits (5) exchange side is by tandem high pressure side LCL circuits (4), parallel connection access high-voltage alternating
Busbar；High-pressure side VSC translation circuits (5) DC side parallel accesses high-pressure side DC bus；
After low-pressure side VSC translation circuits (7) exchange side is by low-pressure side LCL circuits (6) of connecting, parallel connection access low pressure top-cross
Flow busbar；Low-pressure side VSC translation circuits (7) DC side parallel accesses low-pressure side DC bus；
High-pressure side H-VSC translation circuits (8) the exchange side series connection midfrequent AC transformer group (10), DC side series connection high pressure
Side DC bus；
Low-pressure side L-VSC translation circuits (9) the exchange side series connection midfrequent AC transformer group (10), DC side series connection low pressure
Side DC bus；
Wherein, the high-pressure side H-VSC translation circuits (8) are made of 2n bridge arm of n phases, each bridge arm include reactor and
n8The identical submodule of a structure is one group per 4 bridge arms of two-phase, total n/2 groups；The n8The identical sub-module cascade of a structure
One end is connected by reactor with transformer in the reactor of another bridge arm and midfrequent AC transformer group (10) afterwards, the other end
It is connected with high-pressure side DC bus；The midfrequent AC transformer group (10) is made of m identical transformers, m transformer
Parallel running；Transformer primary side connection high-pressure side H-VSC translation circuits (8) in the midfrequent AC transformer group (10), two
Secondary side connection low-pressure side L-VSC translation circuits (9)；The low-pressure side L-VSC translation circuits (9) become with the high-pressure side H-VSC
The structure for changing circuit (8) is identical, is made of 2n bridge arm of n phases, and each bridge arm includes a reactor and n9A structure is identical
Submodule is one group per 4 bridge arms of two-phase, total n/2 groups；The n9One end passes through reactance after the identical sub-module cascade of a structure
Device is connected with transformer in the reactor of another bridge arm and midfrequent AC transformer group (10), and the other end is female with low-pressure side direct current
Line is connected；Wherein, n is even number, and m=n/2, n are the number of phases of the high-pressure side H-VSC translation circuits (8).
2. intelligent distribution network transformation device busbar flow controller according to claim 1, which is characterized in that the high pressure
Side LCL circuits (4) are made of six inductance of three-phase and three capacitances, and per phase, there are two inductance and a capacitances；Two in per phase
A inductance series connection, is connected in parallel with a capacitor, three capacitance star-like connections among two inductance；One in two inductance in per phase
It is a to be connected with high voltage AC bus three, in another upper and lower bridge arm with high-pressure side VSC translation circuits (5) three-phase current converter
Point connection.
3. intelligent distribution network transformation device busbar flow controller according to claim 1, which is characterized in that the high pressure
Side VSC translation circuits (5) are made of six bridge arms of three-phase, and each bridge arm includes a reactor and n5The identical submodule of a structure
Block；The n5One end passes through the reactor of reactor and another bridge arm and the high pressure after the identical sub-module cascade of a structure
Side LCL circuits (4) connect, and the other end is connect with high-pressure side DC bus；The three-phase of the high-pressure side VSC translation circuits (5) is simultaneously
Connection.
4. intelligent distribution network transformation device busbar flow controller according to claim 1, which is characterized in that the low pressure
Side VSC translation circuits (7) are identical as high-pressure side VSC translation circuits (5) structure, are made of six bridge arms of three-phase, each bridge arm packet
Include a reactor and n7The identical submodule of a structure；The n7One end passes through reactance after the identical sub-module cascade of a structure
Device is connect with the reactor of another bridge arm and the low-pressure side LCL circuits (6), and the other end connects with low-pressure side DC bus
It connects；The parallel three phase of the low-pressure side VSC translation circuits (7).
5. intelligent distribution network transformation device busbar flow controller according to claim 1, which is characterized in that the low pressure
Side LCL circuits (6) structure is identical as high-pressure side LCL circuits (4) structure, is made of six inductance of three-phase and three capacitances, per phase
There are two inductance and a capacitances；Two inductance series connection in per phase, is connected in parallel with a capacitor, three capacitances among two inductance
Star-like connection；One in two inductance in per phase is connected with low-pressure side ac bus three, another becomes with low-pressure side VSC
Change the upper and lower bridge arm midpoint connection of circuit (7) three-phase converting means.
6. the intelligent distribution network transformation device busbar flow controller according to claim 1,3 or 4, which is characterized in that institute
It includes semi-bridge type and bridge-type to state submodule；The semi-bridge type submodule is made of 1 bridge arm and 1 capacitance parallel connection；It is described complete
Bridge type submodule is made of 2 bridge arms and 1 capacitance parallel connection；The bridge arm includes 2 series IGBT modules, each IGBT module
Include the diode of 1 IGBT and 1 reverse parallel connection.
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| CN106602608B (en) * | 2017-01-12 | 2019-05-14 | 国网江苏省电力公司南京供电公司 | Photovoltaic energy storage system and its progress control method in a kind of DC distribution net |
| CN111327084B (en) * | 2020-03-03 | 2022-04-12 | 中国南方电网有限责任公司 | Control method and device of alternating current-direct current multi-port interconnection system and storage medium |
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