CN110535133A - A kind of flexibility multimode switching device and system - Google Patents
A kind of flexibility multimode switching device and system Download PDFInfo
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- CN110535133A CN110535133A CN201910904227.1A CN201910904227A CN110535133A CN 110535133 A CN110535133 A CN 110535133A CN 201910904227 A CN201910904227 A CN 201910904227A CN 110535133 A CN110535133 A CN 110535133A
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- 230000033228 biological regulation Effects 0.000 claims abstract description 24
- 239000000203 mixture Substances 0.000 claims abstract description 10
- 238000004146 energy storage Methods 0.000 claims description 21
- 238000004804 winding Methods 0.000 claims description 14
- 238000010586 diagram Methods 0.000 description 6
- 239000000243 solution Substances 0.000 description 4
- 230000001276 controlling effect Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 2
- 230000029087 digestion Effects 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 230000001737 promoting effect Effects 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 230000002457 bidirectional effect Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000011217 control strategy Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 230000023266 generation of precursor metabolites and energy Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000006855 networking Effects 0.000 description 1
- 238000010606 normalization Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000007363 ring formation reaction Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
Classifications
-
- 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
Abstract
The invention discloses a kind of flexible multimode switching device and systems, wherein device includes: control module and at least two device AC ports, the control module, for carrying out power flow of ring net and fault current control comprising: high-speed switch and load flow regulation submodule；Described device AC port is used to carry out electrical interconnection with AC network composition looped network.Flexibility multimode switching device provided by the invention may be implemented to exchange each end flexibility looped network interconnection, trend two-way flow, so that distribution operational mode flexibility switches, control mode is flexible；Flexibility multimode switching system provided by the invention, it is flexibly controllable that flexible interconnection, trend two-way flow, power that N-1 flexible multimode switching device can be realized between each AC port need to be only configured for the system comprising N number of AC port, it can effective fault restriction short circuit current, effectively promotion business efficiency.
Description
Technical field
The present invention relates to electrical equipment technical fields, and in particular to a kind of flexibility multimode switching 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.Existing power distribution network is faced with power demand customization and diversification, distributed generation resource access scale, trend coordinated control are answered
Various huge challenges such as hydridization.Feeder line in more segmentations-multi-joint network power distribution network is replaced using flexible multimode switching device
Interconnection switch makes to form the development trend that normalization " being flexible coupling " is distribution between feeder line.Flexible multimode switching device generally with
Based on full-control type power electronic device, the flow of power between being connected feeder line can be adjusted in real time according to control instruction, to adjust
The trend distribution for controlling whole system, makes the traffic control more " flexibility " of power distribution network, has both the switching of operational mode flexibility, controlling party
The features such as formula is versatile and flexible, can thoroughly change the power supply mode of power distribution network " closed loop design, open loop operation ", in addition, avoiding often
The problems such as power failure caused by rule switch grid switching operation, cyclization impact, moreover it is possible to alleviate voltage dip, three-phase imbalance phenomenon,
The equalization and power quality for promoting feeder line load distribution improve, and the implementation for the following intelligent distribution network provides key technology and sets
Standby support.
Existing flexibility multimode switching device mostly uses DC back to back to connect, and DC side influences each other, one end failure,
It will affect the stable operation of other termination, reliability is not high, and DC voltage coordination control strategy is also more complex；In addition contain N number of exchange
The system of port needs to configure the inverter of N platform full capacity, and economy is poor；The existing exchange interconnection side using tandem arrangement
Case will increase system short-circuit electric current, therefore configure concatenated high-speed switch, quickly unlink when realizing failure, avoid short-circuit electricity
Stream rises.
Summary of the invention
Therefore, the present invention provides a kind of flexible multimode switching device and system, overcomes the skill used in the prior art
The deficiencies of art scheme economy is poor and increases system short-circuit electric current.
In a first aspect, the embodiment of the present invention provides a kind of flexible multimode switching device, comprising: control module and at least
Two device AC ports, the control module, for carrying out power flow of ring net and fault current control comprising: high-speed switch
And load flow regulation submodule；Described device AC port is used to carry out electrical interconnection with AC network composition looped network.
In one embodiment, the high-speed switch, comprising: the first high-speed switch and the second high-speed switch, described first is fast
Speed switch is connected in series with the load flow regulation submodule, and second high-speed switch is connected in parallel with load flow regulation submodule.
In one embodiment, load flow regulation submodule includes: series transformer and voltage source converter, and series transformer is former
The both ends of side winding are connect with device AC port respectively, and series transformer vice-side winding is connect with voltage source converter.
In one embodiment, load flow regulation submodule includes: controlled inductance and controlled capacitance, the controlled inductance and controllable
The branch of composition is connected in series in capacitor, connect respectively with device AC port.
In one embodiment, first high-speed switch and the second high-speed switch are double-direction control switch, comprising: quick machine
Tool switch or electronic power switch or gap.
Second aspect, the embodiment of the present invention provide a kind of flexible multimode switching system, comprising: N number of power grid AC port
And flexible multimode switching device described in the N-1 bright embodiment first aspect of we, the flexibility multimode switching device are logical
Device AC port is crossed to be electrically connected with the power grid AC port；Pass through dress between the flexibility multimode switching device
AC port is set to be electrically connected.
In one embodiment, the connection type between the flexible multimode switching device is star-like or mesh type.
In one embodiment, the flexible multimode switching system, further includes: distributed generation resource, load and energy storage device
At least one of, the flexibility multimode switching device is respectively connected on common bus by device DC port；It is described
Distributed generation resource, load and energy storage device are connected on common bus, realize trend interconnection with each power grid.
Technical solution of the present invention has the advantages that
1. flexibility multimode switching device provided by the invention, comprising: control module and at least two devices exchange end
Mouthful, control module, for carrying out power flow of ring net and fault current control comprising: high-speed switch and load flow regulation submodule；Institute
Device AC port is stated for carrying out electrical interconnection with AC network composition looped network.The device may be implemented to exchange each end flexible ring
Net interconnection, trend two-way flow, so that distribution operational mode flexibility switches, control mode is flexible.
2. flexibility multimode switching system provided by the invention, need to only configure N-1 for the system comprising N number of AC port
Flexible interconnection between each AC port, trend two-way flow, function can be realized in the lesser flexible multimode switching device of a capacity
Rate is flexibly controllable, can effective fault restriction short circuit current, effectively promotion business efficiency.
3. flexibility multimode switching system provided by the invention, may be implemented the multiple-way supply of common bus, enhances confession
The reliability of electric system；Distributed generation resource, load energy storage device etc. are accessed on common bus, are improved power distribution network and are dissolved distributed electrical
The ability in source realizes quickly isolating and turning to supply for failure, while promoting reliability and economic benefit.
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 multimode one exemplary diagram of switching device provided in an embodiment of the present invention；
Fig. 2 is flexible multimode one specific exemplary diagram of switching device provided in an embodiment of the present invention；
Fig. 3 is one specific exemplary diagram of load flow regulation submodule provided in an embodiment of the present invention；
Fig. 4 is another specific exemplary diagram of load flow regulation submodule provided in an embodiment of the present invention；
Fig. 5 is unified specific exemplary diagram of flexible multimode open relation provided in an embodiment of the present invention；
Fig. 6 is another specific exemplary diagram of flexible multimode switching 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 multimode switching device, comprising: control module and at least two devices
AC port, the control module, for carrying out power flow of ring net and fault current control comprising: high-speed switch and trend tune
Control submodule；Described device AC port is used to carry out electrical interconnection with AC network composition looped network.As shown in Figure 1, of the invention
Embodiment is illustrated by taking two device AC ports C1, C2 as an example (to be not limited, may include in other embodiments more
More device AC ports), high-speed switch can be connected in parallel with load flow regulation submodule, can also be with load flow regulation submodule simultaneously
Connection one high-speed switch of connection, while a high-speed switch is connected in series, concatenated high-speed switch quickly unlinks when can be realized failure,
Short circuit current is avoided to rise.
Flexible multimode switching device provided by the invention with power flow of ring net and fault current control function, it can be achieved that
The flexible interconnection of each port, the flexible quick regulation of feeder line trend.
In one embodiment, as shown in Fig. 2, the high-speed switch, comprising: the first high-speed switch and the second high-speed switch,
First high-speed switch and the load flow regulation submodule are connected in series, second high-speed switch and load flow regulation submodule
It is connected in parallel.The first high-speed switch and the second high-speed switch in the embodiment of the present invention are double-direction control switch, comprising: quick machine
Tool switch or electronic power switch or gap, can fast implement power and flexibly adjust according to the power flow changing of practical application scene
Control and trend two-way flow,
In one embodiment, as shown in figure 3, load flow regulation submodule includes: series transformer and voltage source converter, string
The both ends of connection transformer primary winding are connect with device AC port respectively, series transformer vice-side winding and voltage source converter
Connection.Series transformer and voltage source converter composition load flow regulation submodule by adjust injection flexiblesystem voltage come
Adjust trend.
In one embodiment, described controllable as shown in figure 4, load flow regulation submodule includes: controlled inductance and controlled capacitance
The branch of composition is connected in series in inductance and controlled capacitance, connect respectively with device AC port.Controlled inductance and controlled capacitance
The load flow regulation submodule of composition adjusts trend by changing the equivalent impedance sealed in flexiblesystem.
Flexibility multimode switching device provided in an embodiment of the present invention, passes through high-speed switch and trend with double-direction control
The cooperation for regulating and controlling submodule runs the flexible interconnection, it can be achieved that each port, the flexible quick regulation of feeder line trend and failure electricity
Flow control, so that the failure occurrence probability of system is small.
Embodiment 2
The embodiment of the present invention also provides a kind of flexible multimode switching system, comprising: N number of power grid AC port and N-1
Flexible multimode switching device described in embodiment 1, the flexibility multimode switching device pass through device AC port and institute
Power grid AC port is stated to be electrically connected；It is carried out between the flexibility multimode switching device by device AC port electrical
Connection.The connection type between flexible multimode switching device in the embodiment of the present invention is star-like or mesh type.
Flexibility multimode switching system provided in an embodiment of the present invention, the system comprising N number of AC port need to only configure N-1
It is flexibly controllable that platform inverter can be realized flexible interconnection, trend two-way flow, power between each AC port, compared with prior art
In the system containing N number of AC port need to configure N platform full capacity inverter technical solution, effectively improve economic effect
Rate.
In one embodiment, as shown in figure 5, flexible multimode switching system includes three control modules: control module 1,
Control module 2, control module 3 constitute the power grid AC port comprising pressing 10kV in four, are port 1, port 2, port respectively
3, port 4, the connection type between flexible multimode switching device are mesh type, between each port energy can two-way flow, function
Rate is controllable.In the embodiment of the present invention, each control module is by series transformer, voltage source converter VSC, 2 high-speed switch moulds
Block constitutes the structure comprising 2 10kV device AC ports, port C1, port C2, port C4, port C5, port C7, port
C8 is 10kV device AC port.In each control module, series transformer former and deputy side winding both ends parallel connection high-speed switch 2 is (right
Answer high-speed switch 12, high-speed switch 22 and the high-speed switch 32 in three control modules), one end of primary side winding connects one
10kV AC port, the other end connect high-speed switch 1 (high-speed switch 11, high-speed switch 21 in corresponding three control modules and
High-speed switch 31) one end, the other end of high-speed switch 1 connects another 10kV AC port, the port connectivity port C1 1, end
The connectivity port mouth C2 2, the port 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 exchanges side series connection with VSC.In the present embodiment the connection relationship between port can be directly connected to and
It is connected after connecting with switch.
The present invention implements the flexible multimode switching system with power flow of ring net and fault current control function provided, real
The flexible interconnection and closed loop networking operation of four power grid AC systems are showed；By the way that power grid AC port and each control module are connected
It connects, the trend for realizing different alternating current circuits is balanced, and control flexibly, can effective fault restriction short circuit current.
In one embodiment, flexible multimode switching system, further includes: in distributed generation resource, load and energy storage device
At least one, the flexibility multimode switching device is respectively connected on common bus by device DC port；The distribution
Formula power supply, load and energy storage device are connected on common bus, realize trend interconnection with each power grid.
In one embodiment, as shown in fig. 6, flexible multimode switching system includes three control modules: control mould
Block 1, control module 2, control module 3 are constituted comprising pressing 10kV AC port in four, be respectively port 1, port 2, port 3,
The device of port 4 and low pressure ± 375V DC port, between each port energy can two-way flow, power is controllable.Each control module
By series transformer, VSC, 2 high-speed switch modules, constituting includes 2 10kV AC ports, 1 ± 375V DC port
Structure, port C1, port C2, port C4, port C5, port C7, port C8 be 10kV AC port, port C3, C6, C9 are
± 375V DC port.In each control module, (corresponding three controls of series transformer former and deputy side winding both ends parallel connection high-speed switch 2
High-speed switch 12, high-speed switch 22 and high-speed switch 32 in molding block), one end of primary side winding connects a 10kV and exchanges end
Mouthful, the other end connects high-speed switch 1 (high-speed switch 11, high-speed switch 21 and high-speed switch 31 in corresponding three control modules)
One end, the other end of high-speed switch 1 connect another connectivity port 10kV AC port C1 1, the port connectivity port C2 2, end
The connectivity port mouth C4 3, the port connectivity port C5 1, the port connectivity port C7 1, the port connectivity port C8 4；Vice-side winding and VSC are handed over
Side is flowed to be connected in series；VSC DC side is connect with ± 375V DC bus, corresponding port C3, port C6, port C9 connection ±
375V DC bus.In addition, port 1 connects the primary side winding of 10kV/380V AC transformer, secondary just winding is changed with AC/DC
Flow the exchange side series connection of device, AC/DC Converter DC-side connection ± 375V DC bus, ± 375V DC bus connection distribution
Power supply, load and energy storage device.The connection relationship between port or between port and DC bus can be in the present embodiment
It is directly connected to and is connected after connecting with switch.
In practical applications, distributed generation resource for example can be photovoltaic battery panel, and load can fill for electric car direct current
Electric stake, energy storage device can be fixed energy storage device, be also possible to mobile energy storage device, such as mobile energy storage vehicle, mobile energy storage vehicle
As the device of standby energy storage, the DC energy storage current transformer of energy storage device is bidirectional converter, and energy-storage battery group is stored up by direct current
Energy current transformer accesses DC bus, and DC energy storage current transformer is able to carry out the DC charging or direct-current discharge of energy-storage battery group, In
Energy supply is carried out when the regulating power deficiency of fixed energy storage device, has ensured the power supply reliability of important load, improves distribution
The permeability and digestion capability of formula power supply promote power distribution network economy, reliability.
In the topology provided in the embodiment of the present invention, connected between power grid AC port by control module, in busbar voltage
In the case where phase angle difference very little, total power adjusting, series connection access is can be realized in the voltage about 0.15p.u. that seals in for transformer of contacting
Voltage source converter capacity only need the 1/7 of total power inverter, be lost small, at low cost, take up little area, practicability is good.
The present invention implements the flexible multimode switching system with power flow of ring net and fault current control function provided, soft
Property multimode switching device by connection four in press AC port, realize four AC systems flexible interconnection and closed loop connection
Net operation；By the way that AC port to be connect with each control module, the trend for realizing different alternating current circuits is balanced；By by each control
The common DC bus of the low-voltage direct port connection corresponding voltage grade of molding block, realizes the stabilization of its DC voltage；It is logical
Pressure AC port is crossed to the connection between low-voltage direct bus, realizes the duplex feeding of low-voltage direct bus, is enhanced reliable
Property, a plurality of energy pathway is constituted, multiple kinds of energy flow direction and path are formd, realizes the flexible control to distribution；It is low
DC loads and the energy storage devices such as DC bus access roof photovoltaic distributed power supply, electric car are pressed, raising point is realized
The digestion capability of cloth renewable energy promotes power distribution network 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 multimode switching device characterized by comprising control module and at least two devices exchange end
Mouthful,
The control module, for carrying out power flow of ring net and fault current control comprising: high-speed switch and load flow regulation submodule
Block；
Described device AC port is used to carry out electrical interconnection with AC network composition looped network.
2. flexibility multimode switching device according to claim 1, which is characterized in that the high-speed switch, comprising: first
High-speed switch and the second high-speed switch, first high-speed switch and the load flow regulation submodule are connected in series, and described second
High-speed switch is connected in parallel with load flow regulation submodule.
3. flexibility multimode switching device according to claim 1 or 2, which is characterized in that load flow regulation submodule includes:
Series transformer and voltage source converter, the both ends of series transformer primary side winding are connect with device AC port respectively, series connection
Transformer secondary winding is connect with voltage source converter.
4. flexibility multimode switching device according to claim 1 or 2, which is characterized in that load flow regulation submodule includes:
The branch of composition is connected in series in controlled inductance and controlled capacitance, the controlled inductance and controlled capacitance, exchanges end with device respectively
Mouth connection.
5. flexibility multimode switching device according to claim 2, which is characterized in that first high-speed switch and second
High-speed switch is double-direction control switch, comprising: Fast mechanical switch or electronic power switch or gap.
6. a kind of flexibility multimode switching system, comprising: N number of power grid AC port and N-1 are a as described in claim 1-5 is any
Flexible multimode switching device,
The flexibility multimode switching device is electrically connected by device AC port and the power grid AC port；
It is electrically connected between the flexibility multimode switching device by device AC port.
7. flexibility multimode switching system according to claim 6, which is characterized in that the flexibility multimode switching device
Between connection type be star-like or mesh type.
8. flexibility multimode switching system according to claim 6, which is characterized in that further include: distributed generation resource, load
And at least one of energy storage device,
The flexibility multimode switching device is respectively connected on common bus by device DC port；
The distributed generation resource, load and energy storage device are connected on common bus, realize trend interconnection with each power grid.
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| CN201910904227.1A CN110535133A (en) | 2019-09-24 | 2019-09-24 | A kind of flexibility multimode switching device and system |
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| CN201910904227.1A CN110535133A (en) | 2019-09-24 | 2019-09-24 | A kind of flexibility multimode switching device and system |
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| CN112510715A (en) * | 2020-10-31 | 2021-03-16 | 上海交通大学 | Multi-port alternating current power grid flexible interconnection device and control method and system thereof |
| CN114759607A (en) * | 2022-06-15 | 2022-07-15 | 国网湖北省电力有限公司经济技术研究院 | Multi-feeder flexible switching topological structure and flexible switching method |
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