CN109193661A - A kind of high-quality distribution system of alternating current-direct current mixing based on multiterminal flexible interconnection technology - Google Patents
A kind of high-quality distribution system of alternating current-direct current mixing based on multiterminal flexible interconnection technology Download PDFInfo
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- CN109193661A CN109193661A CN201811307004.9A CN201811307004A CN109193661A CN 109193661 A CN109193661 A CN 109193661A CN 201811307004 A CN201811307004 A CN 201811307004A CN 109193661 A CN109193661 A CN 109193661A
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- direct current
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- circuit breaker
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/02—Circuit arrangements for ac mains or ac distribution networks using a single network for simultaneous distribution of power at different frequencies; using a single network for simultaneous distribution of ac power and of dc power
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/007—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources
- H02J3/0073—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources for providing alternative feeding paths between load and source when the main path fails, e.g. transformers, busbars
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/04—Circuit arrangements for ac mains or ac distribution networks for connecting networks of the same frequency but supplied from different sources
- H02J3/06—Controlling transfer of power between connected networks; Controlling sharing of load between connected networks
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- Power Engineering (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention proposes a kind of, and the alternating current-direct current based on multiterminal flexible interconnection technology mixes high-quality distribution system.The present invention includes: that AC circuit breaker is pressed in first, AC circuit breaker is pressed in second, exchange interconnection switch, ac bus is pressed in first, ac bus is pressed in second, one or three port alternating current-direct current flexible interconnection switch, two or three port alternating current-direct current flexible interconnection switch, dc circuit breaker is pressed in first, dc circuit breaker is pressed in second, middle pressure DC bus, energy-storage system, first flexible direct current switch, low-voltage direct breaker, low-voltage direct bus, second flexible direct current switch, flexible AC-DC switch, direct current new energy, exchange new energy.The invention has the advantages that the loss of energy storage transformation can be reduced, high-quality electric energy is provided, and realize seamless turn of power supply.
Description
Technical field
The invention belongs to power grid equipments and operation control technology field, in particular to a kind of to be based on multiterminal flexible interconnection technology
Alternating current-direct current mix high-quality distribution system.
Background technique
With the rapid development of our country's economy, in recent years, Process of Urbanization Construction gos deep into, modern industry garden power load day
Beneficial intensive, the planning arrangement in electric power corridor is further nervous, proposes requirements at the higher level to conventional electrical distribution net power supply capacity.Meanwhile with
The development of the diversification load such as new energy, power electronic technique, it is new to there is large quantities of direct currents, frequency-changing AC etc. in conventional electrical distribution net
Form of power source, direct current or the load accounting containing DC link also increase rapidly in system.Although DC distribution net is direct current hair
Electric unit and load provide efficient access way, however are difficult to meet polymorphic type distributed power generation using single construction for electricity
Unit and load and energy-storage units it is integrated.
With the development of new and high technology, the application of sensitive load is more next extensively, and electrical energy power quality disturbance becomes user and electric power
The major issue that enterprise can not all ignore.More demanding for power quality and load Relatively centralized sensitive power consumer, work
Industry garden be can yet be regarded as a kind of efficient power quality solution.Currently, industry is to high-quality industrial park supplier of electricity both at home and abroad
The content of case forms unified understanding not yet, and there are various topological structures and the configuration methods of custom power equipment, and for
The analysis of garden custom power quality multi-demands, the Basic Problems research such as power supply quality classification is insufficient, causes high-quality industry
Garden investment waste, and the problems such as be unable to satisfy custom power quality demand.
Regarding to the issue above to power distribution network bring new demand and new challenge, the major programme studied at present include energy storage,
Active distribution network and virtual plant etc., these thinkings and scheme are still based on existing network infrastructure, by using advanced storage
Energy, information and control technology realize the promotion of power distribution network service ability and economy.But due to existing distribution network structure knot
Structure limitation, these schemes be difficult to further renewable energy power swing is shared, trend flexibly control, power supply reliability promotion
Etc. play bigger effect.
The basic concept of intelligent power distribution flexible switchgear is that the feeder line for replacing more being segmented in multi-joint network distribution system is normal
Interconnection switch is opened, makes to form normalization " being flexible coupling " between feeder line.It, being capable of basis generally based on full-control type power electronic device
Control instruction adjusts the flow of power between being connected feeder line in real time, to change the trend distribution of whole system, makes distribution system
Traffic control more " flexibility ".Compared with tradition is based on the contact information of ordinary tap, flexible switch avoids switch and frequently becomes
Security risk caused by position greatly improves the flexibility and rapidity of distribution system operation control, brings various
Benefit: regulating power is strong, movement speed faster, movement cost is lower, failure influence it is smaller.With large capacity, low-loss electric power
Electronic component continue to bring out and the continuous reduction of unit capacity price, flexible switchgear connect mesolow distribution level
Enter to thoroughly change the power supply mode of conventional electrical distribution net " closed loop design, open loop operation ", to make system while have more extensively
Two aspect advantages of standby open loop networks and closed network.
In order to further enhance multiple Alternating Current Power Supply area reliabilities, change the contact and confession of current power distribution network from structure
Electric mode is a kind of new scheme, has the flexible direct current technology of high controllability and flexibility by introducing, and constitutes alternating current-direct current
Distribution system is mixed, the problem above that AC distribution mesh front is faced can be preferably solved.It is constructed using flexible interconnection device
Multiple communication area interconnections, realize that multiple communication areas are mutually supported by DC line, and can integrate in DC line
A large amount of DC load, distributed power generation and energy-storage system.Under conditions of not increasing short circuit current, between realization city zoning
Electric energy mutually supplies, to give full play to the power supply capacity of each subregion, the reliability of lifting system；Under normal operating conditions, it realizes and divides
The load balancing in section promotes the operational efficiency of power grid；Under exception or malfunction, dynamic active power can be provided to system
Or reactive power support, enhance the power-angle stability and voltage stability of operation of power networks；After Failure elimination, by stages can
Realize that quickly and effectively electric energy is supported, and avoids the cascading failure of system.
Power distribution network is responsible for the vital task of distribution electric energy in the power system, realizes city using flexible subregion interconnect device
The interconnection of city's high voltage distribution network constitutes alternating current-direct current mixing power distribution network, can not only be more convenient DC load and distributed generation resource
Access, additionally it is possible to which it is limited with the high contradiction of load density to alleviate power industry Campus Network website corridor, provides in load center
Dynamic reactive is supported, is improved power quality, safety, stability and the operational efficiency of distribution system, is matched power industry garden
Operation of power networks is more flexible, controllable, is the important development direction of futurity industry garden power distribution network.
Summary of the invention
The purpose of the present invention is being based on multiterminal flexible interconnection technology, has height reliability and flexibility, meets all kinds of energy
Source and load access, the interconnection of alternating current-direct current mixing power distribution network and looped network operation with closed ring characteristic, realize the alternating current-direct current of load quality supply
High-quality distribution system is mixed, power distribution network safety in operation, reliability and economy are improved.
It is an object of the invention to mutually support technology based on alternating current-direct current multi-source cooperative scheduling technology, AC/DC network, mention
A kind of alternating current-direct current based on multiterminal flexible interconnection technology mixes high-quality distribution system out, realizes towards industrial park difference service area
Flexible direct current interconnection and the control of alternating current-direct current mixing looped network operation with closed ring between domain, solve the access of high permeability renewable energy and ask
Topic.The type alternating current-direct current mixed connection distribution structure can not only provide reliable direct current supply to ensure polymorphic type DC load, hair
The access of electric equipment improves service efficiency, and can use between interconnection rotary substation regulation alternating current-direct current and different exchange
Trend between route, optimizes the system operation, mutually support voltage, promoted whole quality supply ability, power supply efficiency and
Distributed power generation access capability.
The technical solution that the present invention provides is:
A kind of high-quality distribution system of alternating current-direct current mixing based on multiterminal flexible interconnection technology, refers to based on multiterminal flexible interconnection
Technology is switched by three port alternating current-direct current flexible interconnections, the connection of alternating-current system and direct-flow distribution system is realized, by soft
Sexual intercourse dc switch and flexible direct current switch, realization direct current new energy and the access for exchanging new energy；It is straight by handing over three ports
The mutual cooperation for flowing flexible interconnection switch, flexible AC-DC switch and flexible direct current switch, realizes the trend between multiple-variable flow device mouth
The stable operation of control and middle pressure DC bus-bar voltage, low-voltage direct busbar voltage；Three port alternating current-direct current flexible interconnections switch tool
The two states of standby on and off, and can realize that power is continuously controllable, when the first ac bus breaks down, can be selected spare
The problems such as second bus continues to power, and reduces power failure, cyclization impact, alleviates the transient powers such as voltage dip/temporary liter
The phenomenon that, ensure quality supply.
The technical scheme is that a kind of alternating current-direct current of multiterminal flexible interconnection technology mixes high-quality distribution system, feature
Be include: pressed in first AC circuit breaker, press in second AC circuit breaker, exchange interconnection switch, press in first ac bus,
Ac bus, the one or three port alternating current-direct current flexible interconnection switch, the two or three port alternating current-direct current flexible interconnection switch, the are pressed in second
Dc circuit breaker is pressed in one, presses dc circuit breaker, middle pressure DC bus, energy-storage system, the first flexible direct current switch, is low in second
Press dc circuit breaker, low-voltage direct bus, the second flexible direct current switch, flexible AC-DC switch, direct current new energy, the new energy of exchange
Source.
Ac bus is pressed to connect with the exchange interconnection switch by conducting wire in described first, pressure exchange is female in described second
Line is connect with the exchange interconnection switch by conducting wire.
AC circuit breaker is pressed to press ac bus to connect by conducting wire with described first in described first；It is pressed in described first
Ac bus is connect with the exchange input interface that the one or three port alternating current-direct current flexible interconnection switchs by conducting wire；Described first
The DC interface of three port alternating current-direct current flexible interconnections switch presses dc circuit breaker to connect by conducting wire with described first.
AC circuit breaker is pressed to press ac bus to connect by conducting wire with described second in described second；It is pressed in described second
Ac bus is connect with the exchange input interface that the two or three port alternating current-direct current flexible interconnection switchs by conducting wire；Described second
The DC interface of three port alternating current-direct current flexible interconnections switch presses dc circuit breaker to connect by conducting wire with described second.
Dc circuit breaker is pressed to connect with medium pressure DC bus by conducting wire in described first；Straightening stream in described second
Breaker is connect with medium pressure DC bus by conducting wire；Medium pressure DC bus and the energy-storage system are connected by conducting wire
It connects；Medium pressure DC bus is switched with first flexible direct current and is connect by conducting wire；First flexible direct current switch with
The low-voltage direct breaker is connected by conducting wire；The low-voltage direct breaker and the low-voltage direct bus are connected by conducting wire
It connects；The low-voltage direct bus is switched with second flexible direct current and is connect by conducting wire；Second flexible direct current switch with
The direct current new energy is connected by conducting wire；The low-voltage direct bus is connect with the flexible AC-DC switch by conducting wire；
Described second flexible AC-DC switch is connect with the exchange new energy by conducting wire.
Preferably, pressing AC circuit breaker for pressing harmonics in carrying out in described first；Exchange is pressed in described first
Bus is for pressing AC power source in providing；Alternating current-direct current flexible interconnection switch in one or three port is for energy two-way transmission, event
Phragma is from, it can be achieved that from AC system to the transformation of direct current system power and transmission and from AC system to AC system power
Transformation, transmission, disengagement failure electric current；Press dc circuit breaker for pressing direct current protecting in carrying out in described first.
Preferably, pressing AC circuit breaker for pressing harmonics in carrying out in described second；Exchange is pressed in described second
Bus is for pressing AC power source in providing；Alternating current-direct current flexible interconnection switch in two or three port is for energy two-way transmission, event
Phragma is from, it can be achieved that from AC system to the transformation of direct current system power and transmission and from AC system to AC system power
Transformation, transmission, disengagement failure electric current；Press dc circuit breaker for pressing direct current protecting in carrying out in described second.
Medium pressure DC bus is for providing medium voltage DC source；The energy-storage system is supplied for DC energy storage and direct current
Energy；The first flexible direct current switch can control for medium voltage DC；The low-voltage direct breaker is protected for low-voltage direct
Shield；The low-voltage direct bus is for providing low-voltage dc power supply；The second flexible direct current switch is for new to the direct current
The direct current of energy output carries out direct current energy control, and DC power transmission is to the low-voltage direct bus after direct current energy control；
The flexibility AC-DC switch is used to carry out rectification control to the alternating current of exchange new energy output, by direct current after rectification control
It is transmitted to the low-voltage direct bus.
The invention has the advantages that
Middle pressure DC bus-bar voltage floats, and can reduce the loss of energy storage transformation.Medium pressure DC bus and the energy storage
System is connected by conducting wire, and according to the characteristic of energy storage material, medium pressure DC bus-bar voltage can float downwards 30%.
Upstream and downstream Fault Isolation/power quality pollution problem is mutually isolated.The three ports alternating current-direct current flexible interconnection is opened
The interconnection that can be realized a plurality of feeder line is closed, when one end failure of three ports alternating current-direct current flexible interconnection switch or electric energy matter
When amount problem, remaining port can adjust abnormal port and carry out fault traversing operation or straight by flexible switching working mode
The abnormal port of locking is connect, influence of the abnormal port to other ports is eliminated, guarantees the lasting normal operation of other ports, most
Realize to limits the mutually isolated of upstream and downstream failure or power quality problem.
Seamless turn of power supply.Replacing traditional alternating-current switch using three ports alternating current-direct current flexible interconnection switch can be smooth
It is switched to auxiliary bus-bar power supply, avoids the impact of switching moment, realizes seamless turn of power supply.
Multiple-energy-source access interface is provided.Medium pressure DC bus, low-voltage direct bus are easy to implement energy-storage system, distribution
The access of formula power generation, medium pressure DC bus and the low-voltage direct bus pass through the first flexible direct current switch, low-voltage direct
Breaker connection.
High-quality electric energy is provided.Three ports alternating current-direct current flexible interconnection switch in addition to failure or power quality problem every
From function and it is seamless turn other than function of supplying power, alternating current-direct current based on its building mix high-quality distribution system height can not only be provided can
By the continued power of property, additionally it is possible to improve feeder line load balancing degrees, improve power quality, the implementation for the following power distribution network provides pass
Key technology and equipment support.
Distribution is flexible, differentiated control.According to electrical equipment types different in the power distribution network of industrial park to the need of power supply quality
It asks and is divided into different stage, heretofore described distribution system realizes distribution by the switch connection of three port alternating current-direct current flexible interconnections
Continuous controllable, operation the flexible control of net power, meets the customizations such as distributed generation resource consumption, high power supply reliability and quality supply
Electricity needs.
Detailed description of the invention
Fig. 1: present system structure chart；
Fig. 2: the power load low ebb schematic diagram of embodiment of the present invention；
Fig. 3: the power load peak schematic diagram of embodiment of the present invention；
Fig. 4: the single-ended bus-bar fault schematic diagram of embodiment of the present invention；
Fig. 5: the single-ended load side failure schematic diagram of embodiment of the present invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Fig. 1 is that the alternating current-direct current based on multiterminal flexible interconnection technology mixes high-quality distribution system, characterized by comprising: first
Middle pressure AC circuit breaker presses AC circuit breaker, exchange interconnection switch in second, ac bus is pressed in first, pressing exchange in second
Bus, the one or three port alternating current-direct current flexible interconnection switch, the two or three port alternating current-direct current flexible interconnection switch, straightening stream is disconnected in first
Road device presses in second dc circuit breaker, middle pressure DC bus, energy-storage system, the first flexible direct current switch, low-voltage direct breaking
Device, low-voltage direct bus, the second flexible direct current switch, flexible AC-DC switch, direct current new energy, exchange new energy.
In the embodiment of the present invention, ac bus is pressed to connect with the exchange interconnection switch by conducting wire in described first, institute
Stating in second presses ac bus to connect with the exchange interconnection switch by conducting wire.
AC circuit breaker is pressed to press ac bus to connect by conducting wire with described first in described first；It is pressed in described first
Ac bus is connect with the exchange input interface that the one or three port alternating current-direct current flexible interconnection switchs by conducting wire；Described first
The DC interface of three port alternating current-direct current flexible interconnections switch presses dc circuit breaker to connect by conducting wire with described first.
AC circuit breaker is pressed to press ac bus to connect by conducting wire with described second in described second；It is pressed in described second
Ac bus is connect with the exchange input interface that the two or three port alternating current-direct current flexible interconnection switchs by conducting wire；Described second
The DC interface of three port alternating current-direct current flexible interconnections switch presses dc circuit breaker to connect by conducting wire with described second.
Dc circuit breaker is pressed to connect with medium pressure DC bus by conducting wire in described first；Straightening stream in described second
Breaker is connect with medium pressure DC bus by conducting wire；Medium pressure DC bus and the energy-storage system are connected by conducting wire
It connects；Medium pressure DC bus is switched with first flexible direct current and is connect by conducting wire；First flexible direct current switch with
The low-voltage direct breaker is connected by conducting wire；The low-voltage direct breaker and the low-voltage direct bus are connected by conducting wire
It connects；The low-voltage direct bus is switched with second flexible direct current and is connect by conducting wire；Second flexible direct current switch with
The direct current new energy is connected by conducting wire；The low-voltage direct bus is connect with the flexible AC-DC switch by conducting wire；
Described second flexible AC-DC switch is connect with the exchange new energy by conducting wire.
Press AC circuit breaker for pressing harmonics in carrying out in the embodiment of the present invention, in described first；In described first
Pressure ac bus is for pressing AC power source in providing；Alternating current-direct current flexible interconnection switch in one or three port is used for the two-way biography of energy
Defeated, Fault Isolation is, it can be achieved that from AC system to the transformation of direct current system power and transmission and from AC system to exchanging system
Transformation, the transmission, disengagement failure electric current of system power；Press dc circuit breaker for pressing direct current protecting in carrying out in described first.
Press AC circuit breaker for pressing harmonics in carrying out in described second；Press ac bus for mentioning in described second
AC power source is pressed in；Alternating current-direct current flexible interconnection switch in two or three port is used for energy two-way transmission, Fault Isolation, can be real
Now from AC system to the transformation of direct current system power and transmission and from AC system to the transformation of AC system power, biography
Defeated, disengagement failure electric current；Press dc circuit breaker for pressing direct current protecting in carrying out in described second.
Medium pressure DC bus is for providing medium voltage DC source；The energy-storage system is supplied for DC energy storage and direct current
Energy；The first flexible direct current switch can control for medium voltage DC；The low-voltage direct breaker is protected for low-voltage direct
Shield；The low-voltage direct bus is for providing low-voltage dc power supply；The second flexible direct current switch is for new to the direct current
The direct current of energy output carries out direct current energy control, and DC power transmission is to the low-voltage direct bus after direct current energy control；
The flexibility AC-DC switch is used to carry out rectification control to the alternating current of exchange new energy output, by direct current after rectification control
It is transmitted to the low-voltage direct bus.
AC circuit breaker model ZW32-12/630-20 is pressed in described first；AC circuit breaker model is pressed in described second
For ZW32-12/630-20；It is 10kV ac bus that ac bus is pressed in described first；Pressure ac bus is in described second
10kV ac bus；One or three port alternating current-direct current flexible interconnection switchs model ABB PCS100-SFC；Described 2nd 3
Port alternating current-direct current flexible interconnection switchs model ABB PCS100-SFC；Straightening stream breaker model ABB in described first
VD4-1206-25M；Straightening stream breaker model ABB VD4-1206-25M in described second；Medium pressure DC bus is
± 10kV DC bus；The energy-storage system is battery；First flexible direct current switchs model Sinamics DCP；Institute
State low-voltage direct breaker model ABB T6N800/4000-8000FF；The low-voltage direct bus is that ± 400V direct current is female
Line；Second flexible direct current switchs model Sinamics DCP；The flexibility AC-DC switch model ABB 4000-
WIND–INTERFACE-EU；The direct current new energy is photovoltaic cell new energy；The exchange new energy is wind-force new energy.
Four kinds of operating conditions are divided to be illustrated the flow of power under different scenes of the present invention below, as Figure 2-Figure 5:
As shown in Fig. 2, when higher level's power grid and distribution operate normally, and in during power load low ebb, described first
Middle pressure ac bus, straightening stream bus belt loading condition is similar in described second, the direct current new energy, the new energy of exchange
Source is in shutdown status.
Flow of power direction of the invention: higher level's power grid output power is by pressing AC circuit breaker, described in described first
Ac bus, the first general ac bus are pressed in first, and the first general AC load is powered；Higher level's power grid output power
By AC circuit breaker is pressed in first, press in described first ac bus, the one or three port alternating current-direct current flexible interconnection switch,
First important Alternating Current Power Supply bus, is powered the first important AC load；
Higher level's power grid output power passes through pressure AC circuit breaker in described second, presses ac bus, second in described second
General ac bus is powered the second general AC load；Higher level's power grid output power, which passes through in second, presses alternating current interruption
Device presses in described second ac bus, the two or three port alternating current-direct current flexible interconnection switch, the second important Alternating Current Power Supply female
Line is powered the second important AC load；
Higher level's power grid output power is by pressing AC circuit breaker in described first, pressing ac bus in described first, described
One or three port alternating current-direct current flexible interconnection switchs, presses dc circuit breaker, medium pressure DC bus in described first, with higher level's electricity
Net output power passes through pressure AC circuit breaker in described second, presses ac bus, the two or three port to hand over directly in described second
It flows flexible interconnection to switch, press dc circuit breaker, medium pressure DC bus in described second, the energy-storage system is carried out jointly
Charging；Higher level's power grid output power passes through pressure AC circuit breaker in described first, presses ac bus, described first in described first
Three port alternating current-direct current flexible interconnections switch, press dc circuit breaker, medium pressure DC bus, first flexibility in described first
Dc switch, the low-voltage direct bus, with higher level's power grid output power by pressing AC circuit breaker, described the in described second
Pressed in two ac bus, the two or three port alternating current-direct current flexible interconnection switch, press in described second dc circuit breaker, it is described in
DC bus, first flexible direct current switch, the low-voltage direct bus are pressed, important DC load is powered jointly；
One or three port alternating current-direct current flexible interconnection switch and the two or three port alternating current-direct current flexible interconnection switch DC side to and fro flow of power.
As shown in figure 3, when higher level's power grid and distribution operate normally, and it is in power load peak period, described first
Middle pressure ac bus, straightening stream bus belt loading condition is similar in described second, the direct current new energy, the new energy of exchange
Source is in starting state.
Flow of power direction of the invention: higher level's power grid output power is by pressing AC circuit breaker, described in described first
Ac bus, the first general ac bus are pressed in first, and the first general AC load is powered；Higher level's power grid output power
By AC circuit breaker is pressed in first, press in described first ac bus, the one or three port alternating current-direct current flexible interconnection switch,
First important Alternating Current Power Supply bus, is powered the first important AC load；
Higher level's power grid output power passes through pressure AC circuit breaker in described second, presses ac bus, second in described second
General ac bus is powered the second general AC load；Higher level's power grid output power, which passes through in second, presses alternating current interruption
Device presses in described second ac bus, the two or three port alternating current-direct current flexible interconnection switch, the second important Alternating Current Power Supply female
Line is powered the second important AC load；
Higher level's power grid output power is by pressing AC circuit breaker in described first, pressing ac bus in described first, described
One or three port alternating current-direct current flexible interconnection switchs, presses dc circuit breaker, medium pressure DC bus in described first, with higher level's electricity
Net output power passes through pressure AC circuit breaker in described second, presses ac bus, the two or three port to hand over directly in described second
It flows flexible interconnection to switch, press dc circuit breaker, medium pressure DC bus in described second, the energy-storage system is carried out jointly
Charging；Higher level's power grid output power passes through pressure AC circuit breaker in described first, presses ac bus, described first in described first
Three port alternating current-direct current flexible interconnections switch, press dc circuit breaker, medium pressure DC bus, first flexibility in described first
Dc switch, the low-voltage direct bus, with higher level's power grid output power by pressing AC circuit breaker, described the in described second
Pressed in two ac bus, the two or three port alternating current-direct current flexible interconnection switch, press in described second dc circuit breaker, it is described in
DC bus, first flexible direct current switch, the low-voltage direct bus are pressed, the once-through type energy, the second flexibility are straight with passing through
Stream switch, exchange new energy, flexible AC-DC switch, low-voltage direct bus, are jointly powered important DC load；First
Three port alternating current-direct current flexible interconnections switch and the two or three port alternating current-direct current flexible interconnection switch DC side to and fro flow of power.
As shown in figure 4, working as higher level's power grid and distribution abnormal running, the first ac bus is heavily loaded, and pressure exchange is female in second
Ac bus failure is pressed in line underloading or second, the direct current new energy, the exchange new energy are in starting state.
Flow of power direction of the invention: higher level's power grid output power is by pressing AC circuit breaker, described in described first
Ac bus, the first general ac bus are pressed in first, and the first general AC load is powered；Higher level's power grid output power
By AC circuit breaker is pressed in first, press in described first ac bus, the one or three port alternating current-direct current flexible interconnection switch,
First important Alternating Current Power Supply bus, is powered the first important AC load；
Higher level's power grid output power is by pressing AC circuit breaker in described first, pressing ac bus in described first, described
One or three port alternating current-direct current flexible interconnection switchs, presses dc circuit breaker, medium pressure DC bus in described first, to energy storage system
System charging；Higher level's power grid output power is by pressing AC circuit breaker in described first, pressing ac bus, described the in described first
One or three port alternating current-direct current flexible interconnections switch presses dc circuit breaker in described first, is medium pressure DC bus, described first soft
Property dc switch, the low-voltage direct bus, with by the once-through type energy, the second flexible direct current switch, exchange new energy, flexibility
AC-DC switch, low-voltage direct bus, are jointly powered important DC load.
Higher level's power grid output power is by pressing AC circuit breaker in described first, pressing ac bus in described first, described
One or three port alternating current-direct current flexible interconnection switchs, presses dc circuit breaker, medium pressure DC bus, described second in described first
Middle pressure dc circuit breaker, the two or three port alternating current-direct current flexible interconnection switch, the second important Alternating Current Power Supply bus；With it is logical
Cross the once-through type energy, second flexible direct current switch, the exchange new energy, the flexible AC-DC switch, described
Low-voltage direct bus, the low-voltage direct breaker, first flexible direct current switch, medium pressure DC bus, described
Dc circuit breaker, the two or three port alternating current-direct current flexible interconnection switch, the second important Alternating Current Power Supply bus are pressed in two, altogether
It is powered with to the second important AC load.
As shown in figure 5, working as higher level's power grid and distribution abnormal running, the two or three port alternating current-direct current flexible interconnection switch load
Side is broken down, and the direct current new energy, the exchange new energy are in starting state.
Flow of power direction of the invention: higher level's power grid output power is by pressing AC circuit breaker, described in described first
Ac bus, the first general ac bus are pressed in first, and the first general AC load is powered；Higher level's power grid output power
By AC circuit breaker is pressed in first, press in described first ac bus, the one or three port alternating current-direct current flexible interconnection switch,
First important Alternating Current Power Supply bus, is powered the first important AC load；
Higher level's power grid output power passes through pressure AC circuit breaker in described first, presses ac bus, first in described first
General ac bus is powered the first general AC load；
Higher level's power grid output power is by pressing AC circuit breaker in described first, pressing ac bus in described first, described
One or three port alternating current-direct current flexible interconnection switchs, presses dc circuit breaker, medium pressure DC bus in described first, with higher level's electricity
Net output power passes through pressure AC circuit breaker in described second, presses ac bus, the two or three port to hand over directly in described second
It flows flexible interconnection to switch, press dc circuit breaker, medium pressure DC bus in described second, the energy-storage system is carried out jointly
Charging；Higher level's power grid output power passes through pressure AC circuit breaker in described first, presses ac bus, described first in described first
Three port alternating current-direct current flexible interconnections switch, press dc circuit breaker, medium pressure DC bus, first flexibility in described first
Dc switch, the low-voltage direct bus, with higher level's power grid output power by pressing AC circuit breaker, described the in described second
Pressed in two ac bus, the two or three port alternating current-direct current flexible interconnection switch, press in described second dc circuit breaker, it is described in
DC bus, first flexible direct current switch, the low-voltage direct bus are pressed, the once-through type energy, the second flexibility are straight with passing through
Stream switch, exchange new energy, flexible AC-DC switch, low-voltage direct bus, are jointly powered important DC load；
Higher level's power grid output power is by pressing AC circuit breaker in described first, pressing ac bus in described first, described
One or three port alternating current-direct current flexible interconnection switch, the second important Alternating Current Power Supply bus, the conducting wire, to the second important exchange
Load is powered.
Above-mentioned four kinds of operating conditions are only the energy that the alternating current-direct current based on multiterminal flexible interconnection technology mixes high-quality distribution network system
Flowing for example, invention is not limited thereto, the alternating current-direct current mixing under other operating conditions based on multiterminal flexible interconnection technology is excellent
The energy flow of matter distribution network system is similar with above-mentioned four kinds of operating conditions, and details are not described herein.
Although pressure AC circuit breaker in first is used more herein, presses AC circuit breaker, exchange contact to open in second
It closes, ac bus is pressed in first, presses ac bus, the one or three port alternating current-direct current flexible interconnection switch, the two or three port in second
Alternating current-direct current flexible interconnection switch presses dc circuit breaker in first, presses dc circuit breaker, middle pressure DC bus, energy storage system in second
System, the first flexible direct current switch, low-voltage direct breaker, low-voltage direct bus, the second flexible direct current switch, flexible alternating current-direct current are opened
Pass, direct current new energy, the exchange terms such as new energy, but a possibility that be not precluded using other terms.Only using these terms
Merely to more easily describing essence of the invention, being construed as any additional limitation all is and present invention essence
What mind was disagreed.
It should be understood that the above-mentioned description for preferred embodiment is more detailed, can not therefore be considered to this
The limitation of invention patent protection range, those skilled in the art under the inspiration of the present invention, are not departing from power of the present invention
Benefit requires to make replacement or deformation under protected ambit, fall within the scope of protection of the present invention, this hair
It is bright range is claimed to be determined by the appended claims.
Claims (4)
1. a kind of alternating current-direct current based on multiterminal flexible interconnection technology mixes high-quality distribution system, characterized by comprising: in first
AC circuit breaker is pressed, AC circuit breaker, exchange interconnection switch are pressed in second, presses that ac bus, pressure exchange is female in second in first
Line, the one or three port alternating current-direct current flexible interconnection switch, the two or three port alternating current-direct current flexible interconnection switch, press direct current interruption in first
Device, press in second dc circuit breaker, middle pressure DC bus, energy-storage system, the first flexible direct current switch, low-voltage direct breaker,
Low-voltage direct bus, the second flexible direct current switch, flexible AC-DC switch, direct current new energy, exchange new energy；
In described first press ac bus connect with the exchange interconnection switch by conducting wire, in described second pressure ac bus and
The exchange interconnection switch is connected by conducting wire；Pressure ac bus in AC circuit breaker and described first is pressed to pass through in described first
Conducting wire connection；Ac bus is pressed to exchange input interface with what the one or three port alternating current-direct current flexible interconnection switched in described first
It is connected by conducting wire；Direct current interruption is pressed in the DC interface and described first of one or three port alternating current-direct current flexible interconnection switch
Device is connected by conducting wire；AC circuit breaker is pressed to press ac bus to connect by conducting wire with described second in described second；It is described
Ac bus is pressed to connect with the exchange input interface that the two or three port alternating current-direct current flexible interconnection switchs by conducting wire in second；
Pressure dc circuit breaker is connected by conducting wire in the DC interface and described second of two or three port alternating current-direct current flexible interconnection switch
It connects；Dc circuit breaker is pressed to connect with medium pressure DC bus by conducting wire in described first；Direct current interruption is pressed in described second
Device is connect with medium pressure DC bus by conducting wire；Medium pressure DC bus is connect with the energy-storage system by conducting wire；
Medium pressure DC bus is switched with first flexible direct current and is connect by conducting wire；First flexible direct current switch with it is described
Low-voltage direct breaker is connected by conducting wire；The low-voltage direct breaker is connect with the low-voltage direct bus by conducting wire；
The low-voltage direct bus is switched with second flexible direct current and is connect by conducting wire；Second flexible direct current switch with it is described
Direct current new energy is connected by conducting wire；The low-voltage direct bus is connect with the flexible AC-DC switch by conducting wire；It is described
Second flexible AC-DC switch is connect with the exchange new energy by conducting wire.
2. the alternating current-direct current according to claim 1 based on multiterminal flexible interconnection technology mixes high-quality distribution system, feature
It is: presses AC circuit breaker for pressing harmonics in carrying out in described first；Press ac bus for providing in described first
Middle pressure AC power source；One or three port alternating current-direct current flexible interconnection switch for energy two-way transmission, Fault Isolation, it can be achieved that
From AC system to the transformation of direct current system power and transmission and from AC system to the transformation of AC system power, transmission,
Disengagement failure electric current；Press dc circuit breaker for pressing direct current protecting in carrying out in described first.
3. the alternating current-direct current according to claim 1 based on multiterminal flexible interconnection technology mixes high-quality distribution system, feature
It is: presses AC circuit breaker for pressing harmonics in carrying out in described second；Press ac bus for providing in described second
Middle pressure AC power source；Two or three port alternating current-direct current flexible interconnection switch for energy two-way transmission, Fault Isolation, it can be achieved that
From AC system to the transformation of direct current system power and transmission and from AC system to the transformation of AC system power, transmission,
Disengagement failure electric current；Press dc circuit breaker for pressing direct current protecting in carrying out in described second.
4. the alternating current-direct current according to claim 1 based on multiterminal flexible interconnection technology mixes high-quality distribution system, feature
Be: medium pressure DC bus is for providing medium voltage DC source；The energy-storage system is energized for DC energy storage and direct current；
The first flexible direct current switch can control for medium voltage DC；The low-voltage direct breaker is protected for low-voltage direct；
The low-voltage direct bus is for providing low-voltage dc power supply；The second flexible direct current switch is for the direct current new energy
The direct current of output carries out direct current energy control, and DC power transmission is to the low-voltage direct bus after direct current energy control；It is described
Flexible AC-DC switch is used to carry out rectification control to the alternating current of exchange new energy output, by DC power transmission after rectification control
To the low-voltage direct bus.
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