CN109802422A - A kind of flexibility looped network interconnect device and system - Google Patents
A kind of flexibility looped network interconnect device and system Download PDFInfo
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- CN109802422A CN109802422A CN201910117384.8A CN201910117384A CN109802422A CN 109802422 A CN109802422 A CN 109802422A CN 201910117384 A CN201910117384 A CN 201910117384A CN 109802422 A CN109802422 A CN 109802422A
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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 discloses a kind of flexible looped network interconnect device and systems, wherein, the flexibility looped network interconnect device includes: multiple power grid AC ports, at least one first flexible interconnection module and at least one second flexible interconnection module, it is interconnected between first flexible interconnection module and the second flexible interconnection module, wherein, first flexible interconnection wired in parallel is connected between two AC ports, and the first interconnection module includes: at least one first DC port and/or at least one first AC port；Second flexible interconnection block coupled in series is connected between two AC ports, second flexible interconnection module includes: the second DC port or the second AC port, it realizes and exchanges each end flexibility looped network interconnection, trend two-way flow, so that distribution operational mode flexibility switches, control mode is flexible.
Description
Technical field
The present invention relates to electrical equipment technical fields, and in particular to a kind of flexibility looped network interconnect device and system.
Background technique
Power distribution network is in the end of electric system, is directly facing power consumer, carries the weight of distribution electric energy, services client
Appoint.Currently, distribution network construction lag, unreasonable structure, " closed loop design, open loop operation " makes control measures limited, constrains
The flexibility of power distribution network operation control, causes the problems such as feeder load is unbalanced, the service restoration time is long.On the other hand, match
Non-linear in power grid, impact load specific gravity increase and the continuous improvement of new energy permeability, to distribution network electric energy quality
Requirements at the higher level are proposed with the safeguard mean of power supply reliability.Existing power distribution network be faced with power demand customize and diversification,
Various huge challenges such as distributed generation resource accesses scale, trend coordinated control complicates.These problems are opened using conventional
Traditional control measures such as pass are difficult to effectively be solved simultaneously.
Summary of the invention
Therefore, the present invention provides a kind of flexible looped network interconnect device and system, overcomes ordinary tap in the prior art and falls
The deficiency of the problems such as power failure caused by lock operates, cyclization impact.
In a first aspect, the embodiment of the present invention provides a kind of flexible looped network interconnect device, comprising: multiple power grid AC ports,
At least one first flexible interconnection module and at least one second flexible interconnection module, the first flexible interconnection module and second
It is interconnected between flexible interconnection module, wherein the first flexible interconnection wired in parallel is connected to two power grid exchange ends
Between mouthful, the first flexible interconnection module includes: at least one first DC port and/or at least one first AC port；Institute
It states the second flexible interconnection block coupled in series to be connected between the two power grid AC ports, the second flexible interconnection module includes:
Second DC port or the second AC port.
In one embodiment, first DC port and the second DC port are for directly interconnection, or are connected to straight
Bus is flowed, or DC bus is connected to by tandem tap.
In one embodiment, the first AC port and the second AC port are for directly interconnection, or are connected to exchange mother
Line, or ac bus is connected to by tandem tap.
In one embodiment, the first flexible interconnection module includes multiport electric power electric transformer, the multiport
Electric power electric transformer includes: at least one first DC port and/or at least one first AC port.
In one embodiment, the second flexible interconnection module includes: series transformer and voltage source converter, the string
The one end for joining transformer primary winding connects an AC port, and the other end connects another AC port, vice-side winding and voltage source
Inverter connection.
In one embodiment, it is directly connected between the series transformer and voltage source converter or is connected by tandem tap
It connects.
In one embodiment, the second flexible interconnection module further include: by-pass switch is connected in parallel on the series transformer
Primary side and/or vice-side winding both ends, for the series transformer carry out short-circuit protection.
Second aspect, the present invention provide a kind of flexible looped network interacted system, comprising: distributed generation resource, load, energy storage device
And flexible looped network interconnect device described in first aspect, the first flexible interconnection module connect respectively with the second flexible interconnection module
It is connected on common bus；The distributed generation resource, load and energy storage device are connected on the common bus, real with each power grid
Existing trend interconnection.
Technical solution of the present invention has the advantages that
1. a kind of flexible looped network interconnect device provided by the invention, comprising: multiple power grid AC ports, at least one first
Flexible interconnection module and at least one second flexible interconnection module, between the first flexible interconnection module and the second flexible interconnection module
Interconnected, wherein the first flexibility can for multiterminal be open electric power electric transformer, comprising at least one first DC port and/
Or at least one first AC port is connected in parallel between two power grid AC ports, the second flexible interconnection module may include string
Join transformer T and voltage source converter VSC, be connected in series between two power grid alternating current ports, realizes and exchange each end flexibility
Looped network interconnection, trend two-way flow, so that distribution operational mode flexibility switches, control mode is flexible.
2. a kind of flexible looped network interacted system provided by the invention, by by the flexible interconnection in flexible looped network interconnect device
Module is interconnected or is connected to common bus, not only exchanges each end flexibility looped network interconnection, power flexible modulation, trend bidirectional flow
Dynamic, each flexible interconnection module is connected to common bus, realizes the multiple-way supply of common bus, enhances the reliable of power supply system
Property；Distributed generation resource, load etc. are accessed on common bus, improves the permeability and digestion capability of distributed generation resource, promote distribution
Net economy, reliability.
Detailed description of the invention
It, below will be to specific in order to illustrate more clearly of the specific embodiment of the invention or technical solution in the prior art
Embodiment or attached drawing needed to be used in the description of the prior art be briefly described, it should be apparent that, it is described below
Attached drawing is some embodiments of the present invention, for those of ordinary skill in the art, before not making the creative labor
It puts, is also possible to obtain other drawings based on these drawings.
Fig. 1 is flexible looped network one exemplary flow chart of interconnect device provided in an embodiment of the present invention；
Fig. 2 is another exemplary flow chart of flexible looped network interconnect device provided in an embodiment of the present invention；
Fig. 3 is another exemplary flow chart of flexible looped network interconnect device provided in an embodiment of the present invention；
Fig. 4 is the flow chart of another specific example of flexible looped network interconnect device provided in an embodiment of the present invention；
Fig. 5 is the flow chart of another specific example of flexible looped network interconnect device provided in an embodiment of the present invention；
Fig. 6 is the flow chart of flexible looped network one specific example of interacted system provided in an embodiment of the present invention；
Fig. 7 is the flow chart of another specific example of flexible looped network interacted system provided in an embodiment of the present invention.
Specific embodiment
Technical solution of the present invention is clearly and completely described below in conjunction with attached drawing, it is clear that described implementation
Example is a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, ordinary skill
Personnel's every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " installation ", " phase
Even ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It can
To be mechanical connection, it is also possible to be electrically connected；It can be directly connected, can also indirectly connected through an intermediary, it can be with
It is the connection inside two elements, can be wireless connection, be also possible to wired connection.For those of ordinary skill in the art
For, the concrete meaning of above-mentioned term in the present invention can be understood with concrete condition.
As long as in addition, the non-structure each other of technical characteristic involved in invention described below different embodiments
It can be combined with each other at conflict.
The embodiment of the present invention provides a kind of flexible looped network interconnect device, as shown in Figure 1, comprising: multiple power grid AC ports
(Fig. 1 with 2 AC ports be citing, but be not limited), at least one first flexible interconnection module 11 and at least one
Second flexible interconnection module 21, is interconnected that (Fig. 1 is to wrap between the first flexible interconnection device and the second flexible interconnection device
A first flexible interconnection module 11 and second flexible interconnection module 22 are included as citing, but is not limited), described the
One flexible interconnection wired in parallel is connected between two power grid AC ports, and the first flexible interconnection module includes: at least 1
One DC port and/or at least one first AC port；The second flexible interconnection block coupled in series is connected to two power grids exchange end
Between mouthful, the second flexible interconnection module includes: the second DC port or the second AC port.
In practical applications, first DC port and the second DC port are for directly interconnection, or are connected to straight
Bus is flowed, or DC bus is connected to by tandem tap.First AC port and the second AC port are used to directly interconnect,
Perhaps it is connected to ac bus or ac bus is connected to by tandem tap.In practical applications, corresponding voltage grade electricity
First DC port of pressure property is interconnected with the second DC port, the first AC port of corresponding voltage voltage gradation property
It is interconnected with the second AC port.
Flexibility looped network interconnect device provided in an embodiment of the present invention, it is multi-joint instead of the more segmentations-used in the prior art
The mode of feeder line interconnection switch in network power distribution network can adjust in real time the flow of power between being connected feeder line according to control instruction,
To regulate and control whole system trend distribution, make the traffic control more " flexibility " of power distribution network, have both operational mode flexibility switch,
The flexible feature of control mode.
In one embodiment, which may include: four power grid AC ports, one first
Flexible interconnection module 11 and three the second flexible interconnection modules 21, as shown in Fig. 2, the flexibility looped network interconnect device specifically includes:
Four AC ports are respectively AC port 1, AC port 2, AC port 3, AC port 4, and four AC ports can be with
It is not limited for middle pressure 10KV only as example.Wherein AC port 1 and AC port 2 are located at a feeder line, exchange
Port 1 and AC port 2 are located at a feeder line, and carry out electrical interconnection between two feeder lines.Wherein, the first flexible interconnection module
11 are connected in parallel between AC port 1 and AC port 2 by its AC port B1, and straightening flow port B2 and low in drawing
AC port B3 is pressed, three the second flexible interconnection modules 21 are connected in series in by its AC port C1 and AC port C2 respectively
Between AC port 1 and AC port 2, and draws low-voltage alternating-current port C3, gone here and there by its AC port C4 and AC port C5
Connection is connected between AC port 3 and AC port 4, and draw low-voltage alternating-current port C6 and by its AC port C7 and
AC port C8 is connected in series between AC port 3 and AC port 4, and draws low-voltage alternating-current port C9, above-mentioned low pressure
AC port B3, low-voltage alternating-current port C3, low-voltage alternating-current port C6 and low-voltage alternating-current port C9 are directly interconnected.
In another embodiment, as shown in figure 3, above-mentioned flexibility looped network interconnect device, by low-voltage alternating-current port B3, low
Pressure AC port C3, low-voltage alternating-current port C6 and low-voltage alternating-current port C9 are directly connected to low-voltage direct bus or are connected to
DC bus, or DC bus is connected to by tandem tap.
In embodiments of the present invention, flexible looped network interconnect device as shown in Figure 2 or as shown in Figure 3, by handing over low pressure
Flow port B3, low-voltage alternating-current port C3, low-voltage alternating-current port C6 and low-voltage alternating-current port C9 directly interconnect or connect relevant voltage
Grade common DC bus realizes the interconnection of AC system, middle straightening streaming system and low-voltage direct-current system, realizes not collinear
The trend on road is balanced, constitutes a plurality of energy pathway, forms multiple kinds of energy flow direction and path, realizes the spirit to distribution
Control living.
In one embodiment, the first flexible interconnection module 11 includes multiport electric power electric transformer, the multiterminal
Mouth electric power electric transformer includes: at least one first DC port and/or at least one first AC port, in the embodiment of the present invention
In, as shown in figure 4, the first flexible interconnection module 11 is three port electric power electric transformers, port B1 is 10KV AC port, end
Mouthful B2 is ± 10KV DC port, port B3 is ± 375V DC port, port B1 connection AC port 1, port B2 connection ±
10KV DC bus, port B3 connection ± 375V DC bus, is only illustrated with this, is not limited, in other embodiments may be used
Think high voltage direct current port etc..
In another embodiment, as shown in figure 5, the first flexible interconnection module 11 is three port power electronics transformations
Device, port B1 is 10KV AC port, port B2 is ± 10KV DC port, the AC port that port B3 is 380V, Ke Yilian
It is connected on ac bus 5 and is connect by transformer with AC port 1, it is above only to be illustrated with this, it is not limited.
In one embodiment, as shown in figure 4, three the second flexible interconnection modules 21 respectively include: series transformer T
And voltage source converter VSC, constituting includes 2 10KV AC ports, the structure of 1 ± 375V DC port, wherein port
C1, port C2, port C4, port C5, port C7, port C8 be 10KV AC port, port C3, port C6, port C9 be ±
375V DC port.In embodiments of the present invention, the former and deputy side winding both ends series transformer T bridge by-pass switch K (at other
In embodiment, by-pass switch K can be set in primary side or vice-side winding), it is other for carrying out short-circuit protection to series transformer T
Way switch K is closed in plant failure, and device disconnects when working normally, and one end of primary side winding connects a 10KV and exchanges end
Mouthful, the other end connects another 10KV AC port, 3 connectivity port middle port C1 1 of corresponding diagram, the port connectivity port C2 2, port
The connectivity port C4 3, the port connectivity port C5 1, the port connectivity port C7 1, the port connectivity port C8 4；Vice-side winding and voltage source
Inverter VSC exchanges side and is connected in series；Voltage source converter VSC DC side and the first flexible interconnection module 11 and ± 375V direct current
Bus connects 3 middle port C3 of corresponding diagram, port C6, port C9 connection ± 375V DC bus.
In another embodiment, as shown in figure 5, the second flexible interconnection module 21 further include: AC/DC link, with the electricity
Source Con-verters VSC connection, is converted to exchange for direct current, makes the second flexible interconnection module output AC port.First is soft
The AC port of property interconnection module and the AC port of the second flexible interconnection module are connected on ac bus 5, are only illustrated with this,
It is not limited.
Flexibility looped network interconnect device provided in an embodiment of the present invention, comprising: include: multiple power grid AC ports, at least one
A first flexible interconnection module and at least one second flexible interconnection module, the first flexibility can become for multiterminal opening power electronics
Depressor, comprising at least one first DC port and/or at least one first AC port is connected in parallel in two power grid AC ports
Between, the second flexible interconnection module may include series transformer T and voltage source converter VSC, be connected in series in the friendship of two power grids
It flows between AC port, realizes and exchange each end flexibility looped network interconnection, trend two-way flow, so that distribution operational mode flexibility is cut
Change, control mode it is flexible.
Embodiment 2
The embodiment of the present invention also provides a kind of flexible looped network interacted system, as shown in FIG. 6 and 7, flexibility looped network interconnection
System includes: flexible looped network interconnect device described in distributed generation resource, load, energy storage device and embodiment 1, and first is flexible mutual
Gang mould block and the second flexible interconnection module are respectively connected on common bus；Distributed generation resource and load are connected to the public mother
On line, trend interconnection is realized with each power grid.
In practical applications, the common bus can be DC bus or ac bus, when common bus is direct current
When bus, distributed generation resource for example can be photovoltaic battery panel, and load can be electric car direct-current charging post, and energy storage device can
To be fixed energy storage device, it is also possible to mobile energy storage device, such as mobile energy storage vehicle, dress of the mobile energy storage vehicle as standby energy storage
It sets, the DC energy storage current transformer of energy storage device is bidirectional converter, and energy-storage battery group accesses direct current by DC energy storage current transformer
Bus, DC energy storage current transformer are able to carry out the DC charging or direct-current discharge of energy-storage battery group, in the tune of fixed energy storage device
Energy supply is carried out when saving scarce capacity；When common bus be ac bus when, distributed generation resource can for wind power generation plant,
It is energy accumulation device for fly wheel etc. that AC load, which can be residential electricity consumption, energy storage device, and the exchange energy accumulation current converter in energy storage device is same
Reason is also bidirectional converter, and energy accumulation device for fly wheel can be accessed on ac bus by exchange energy accumulation current converter, and exchange energy storage becomes
Stream device is able to carry out the AC charging of energy-storage battery group or stream banishes electricity, carries out in the regulating power deficiency of fixed energy storage device
Energy supply has ensured the power supply reliability of important load, improves the permeability and digestion capability of distributed generation resource, promotes distribution
Net economy, reliability.
Obviously, the above embodiments are merely examples for clarifying the description, and does not limit the embodiments.It is right
For those of ordinary skill in the art, can also make on the basis of the above description it is other it is various forms of variation or
It changes.There is no necessity and possibility to exhaust all the enbodiments.And thus amplify out it is obvious variation or
It changes still within the protection scope of the invention.
Claims (8)
1. a kind of flexibility looped network interconnect device characterized by comprising multiple power grid AC ports, at least one first flexibility
Interconnection module and at least one second flexible interconnection module, between the first flexible interconnection module and the second flexible interconnection module
It is interconnected, wherein
The first flexible interconnection wired in parallel is connected between the two power grid AC ports, the first flexible interconnection module
It include: at least one first DC port and/or at least one first AC port；
The second flexible interconnection block coupled in series is connected between the two power grid AC ports, the second flexible interconnection module
It include: the second DC port or the second AC port.
2. flexibility looped network interconnect device according to claim 1, which is characterized in that first DC port is straight with second
Flow port is perhaps connected to DC bus or is connected to DC bus by tandem tap for directly interconnecting.
3. flexibility looped network interconnect device according to claim 1, which is characterized in that the first AC port exchanges end with second
Mouth is perhaps connected to ac bus or is connected to ac bus by tandem tap for directly interconnecting.
4. flexibility looped network interconnect device according to claim 2, which is characterized in that the first flexible interconnection module includes
Multiport electric power electric transformer, the multiport electric power electric transformer include: at least one first DC port and/or at least
One first AC port.
5. flexibility looped network interconnect device according to claim 1, which is characterized in that the second flexible interconnection module packet
Include: one end of series transformer and voltage source converter, the series transformer primary side winding connects an AC port, the other end
Another AC port is connected, vice-side winding is connect with voltage source converter.
6. flexibility looped network interconnect device according to claim 5, which is characterized in that the series transformer and voltage source change
It is directly connected between stream device or is connected by tandem tap.
7. flexibility looped network interconnect device according to claim 5, which is characterized in that the second flexible interconnection module is also wrapped
Include: by-pass switch is connected in parallel on primary side and/or the vice-side winding both ends of the series transformer, for the series transformer
Carry out short-circuit protection.
8. a kind of flexibility looped network interacted system characterized by comprising distributed generation resource, load, energy storage device and as right is wanted
Any flexible looped network interconnect device of 1-7 is sought,
The first flexible interconnection module and the second flexible interconnection module are respectively connected on common bus；
The distributed generation resource, load and energy storage device are connected on the common bus, realize trend interconnection with each power grid.
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| CN201910117384.8A CN109802422B (en) | 2019-02-15 | 2019-02-15 | Flexible looped network interconnection device and system |
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| CN201910117384.8A CN109802422B (en) | 2019-02-15 | 2019-02-15 | Flexible looped network interconnection device and system |
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| CN110535133A (en) * | 2019-09-24 | 2019-12-03 | 全球能源互联网研究院有限公司 | A kind of flexibility multimode switching device and system |
| CN111463787A (en) * | 2020-04-22 | 2020-07-28 | 湖北春田电工技术有限公司 | Flexible networking system for power grids with different voltage levels in enterprise |
| CN111682547A (en) * | 2020-07-06 | 2020-09-18 | 梁家诚 | 10kV active power distribution network based on power flow control nodes and control method thereof |
| CN112202173A (en) * | 2020-10-19 | 2021-01-08 | 湖北春田电工技术有限公司 | Medium-voltage bus flexible interconnection power distribution network system |
| CN114362182A (en) * | 2021-12-28 | 2022-04-15 | 国网北京市电力公司 | Four-end flexible direct-current interconnection double-loop network power distribution system |
| CN114865634A (en) * | 2022-01-17 | 2022-08-05 | 全球能源互联网研究院有限公司 | Flexible interconnection wiring structure of alternating current power grid and control method |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110535133A (en) * | 2019-09-24 | 2019-12-03 | 全球能源互联网研究院有限公司 | A kind of flexibility multimode switching device and system |
| CN111463787A (en) * | 2020-04-22 | 2020-07-28 | 湖北春田电工技术有限公司 | Flexible networking system for power grids with different voltage levels in enterprise |
| CN111682547A (en) * | 2020-07-06 | 2020-09-18 | 梁家诚 | 10kV active power distribution network based on power flow control nodes and control method thereof |
| CN112202173A (en) * | 2020-10-19 | 2021-01-08 | 湖北春田电工技术有限公司 | Medium-voltage bus flexible interconnection power distribution network system |
| CN114362182A (en) * | 2021-12-28 | 2022-04-15 | 国网北京市电力公司 | Four-end flexible direct-current interconnection double-loop network power distribution system |
| CN114362182B (en) * | 2021-12-28 | 2024-04-26 | 国网北京市电力公司 | Four-terminal flexible direct-current interconnection dicyclo network distribution system |
| CN114865634A (en) * | 2022-01-17 | 2022-08-05 | 全球能源互联网研究院有限公司 | Flexible interconnection wiring structure of alternating current power grid and control method |
| CN114865634B (en) * | 2022-01-17 | 2024-05-07 | 国网智能电网研究院有限公司 | Flexible interconnection wiring structure of alternating current power grid and control method |
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