CN106877317B - Definition, networking form, the method for operation and the transition method of flexible power distribution network - Google Patents
Definition, networking form, the method for operation and the transition method of flexible power distribution network Download PDFInfo
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- CN106877317B CN106877317B CN201710179790.8A CN201710179790A CN106877317B CN 106877317 B CN106877317 B CN 106877317B CN 201710179790 A CN201710179790 A CN 201710179790A CN 106877317 B CN106877317 B CN 106877317B
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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
Abstract
The invention discloses definition, networking form, the method for operation and the transition methods of a kind of flexible power distribution network, comprising: aerial net simply connected network installs flexible Switching Station in contact point and replaces interconnection switch；Cable system simply connected network installs flexible Switching Station in looped network point；The aerial multi-joint network of net replaces traditional interconnection switch with flexible Switching Station and the mode of connection is transformed, and other interconnection switch is closed, improved Redundanter schalter is removed；The multi-joint network of cable system installs flexible Switching Station in the looped network point transformation mode of connection, is closed interconnection switch；Flexible power distribution network definition: for realizing the power distribution network of flexible operation with closed ring, including two features: closed loop, flexibility；Flexible Switching Station definition: a multiterminal flexible apparatus constitutes Switching Station by multiple flexible switch, mixes flexible Switching Station and is connected to the main feeder to substation using flexible switch, is connected to secondary branch route using hard-switch.The invention has most important theories value and practical application value, has directive significance in demonstration project.
Description
Technical field
The present invention relates to intelligent distribution network planning fields, grind to flexible electric electronic technology transformation and upgrade power distribution network
Study carefully more particularly to a kind of definition, networking form, the method for operation and the transition method of flexible power distribution network.
Background technique
The Chinese existing principle of power distribution network because short circuit current control the reason of due to take looped network design open loop operation mode, this
Kind of the method for operation there are many problems, such as short term outage outstanding problem, Distribution Network Equipment utilization rate is low, limitation reliability into
One step raising etc..Limitation of power load distributing of the conventional electrical distribution net when reaching net capability due to open loop operation mode, reality
Border operating status is difficult up to net capability, and utilization rate of equipment and installations is low；When failure or maintenance, load passes through bus connection switch in standing
Or the outer interconnection switch in station carries out discrete turn of band, short term outage outstanding problem, reliability is low.
Summary of the invention
The present invention provides a kind of definition of flexible power distribution network, networking form, the method for operation and transition method, the present invention are detailed
It is thin to define flexible power distribution network FDN, it provides its networking form, the method for operation and is later FDN from conventional electrical distribution net transition method
Development provide technological guidance, it is described below:
A kind of definition, networking form, the method for operation and the transition method of flexibility power distribution network, the method includes following steps
It is rapid:
Aerial net simply connected network transformation: in contact point, installation both ends flexibility Switching Station replaces interconnection switch；
The transformation of cable system simply connected network: flexible Switching Station is installed in looped network point, the soft of feeder line is realized by flexible Switching Station
Property operation with closed ring；
The aerial multi-joint network transformation of net: replacing traditional interconnection switch that the mode of connection is transformed with flexibility Switching Station, will be other
Interconnection switch closure, removes improved Redundanter schalter；
The multi-joint network transformation of cable system: flexible Switching Station is installed in the looped network point transformation mode of connection, is closed interconnection switch；
Marine tidal-current energy choice direction between three feedback lines mutually got in touch with flexible Switching Station is smoothly mutually supported, flexible distribution
The feeder line equivalent load relative equilibrium of net, reaches balanced feeder load；
After feeder line outlet is broken down, feeder line gate out switch disconnects isolated fault, non-faulting area with on-load switch is closed on
Section is powered by the feeder line that flexible Switching Station interconnects；
To feeder line section maintenance when, successively disconnect maintenance area two sides block switch, the load of block switch upstream directly by
Feeder line turns band, and the load in another block switch downstream carries out power support by the feeder line that flexible Switching Station interconnects；
Wherein, above-mentioned flexible power distribution network is defined as: closed for realizing the power distribution network of flexible operation with closed ring, including fisrt feature
Ring；Further include: second feature is flexible；
The closed loop feature can be used for avoiding having a power failure in short-term when failure or maintenance, have blocking energy to short circuit current in closed loop point
Power；The flexible characteristic can be used for power flowcontrol, adapt to the fluctuation of load and distributed energy；
The flexibility Switching Station is defined as: a multiterminal flexible apparatus, i.e., the Switching Station being made up of multiple flexible switch,
Special case of the separate unit flexible switch as flexible Switching Station；Flexible Switching Station combination conventional rigid switchs to form hybrid mode, mixing
Flexible Switching Station connects the main feeder to substation using flexible switch, is connected to secondary branch route using hard-switch
It connects.
The beneficial effect of the technical scheme provided by the present invention is that: The present invention gives the improved distribution of flexible electric electronics
The specific definition of net, and provide its networking form, the method for operation and from conventional electrical distribution net transition method.The invention has important
Theoretical value and practical application value, be applied to the section of domestic and international first multiterminal flexibility closed loop medium voltage distribution network demonstration project
It grinds in demonstration, there is actual directive significance in demonstration project, provide certain technological guidance for the planning of later FDN.
Detailed description of the invention
Fig. 1 is the flow chart of the definition of flexible power distribution network, networking form, the method for operation and transition method；
Fig. 2 is the schematic diagram of the FDN transformation of aerial net simply connected network；
Fig. 3 is the schematic diagram that the FDN of cable system simply connected network is transformed；
Fig. 4 is the schematic diagram of the FDN transformation of the aerial multi-joint network of net；
Fig. 5 is the schematic diagram that the FDN of the multi-joint network of cable system is transformed；
Fig. 6 is the schematic diagram of the normal operation of FDN；
Fig. 7 is the schematic diagram of the N-1 failure operation of FDN；
Fig. 8 is the schematic diagram of the inspection travel of FDN；
Fig. 9 is the schematic diagram of FDN example.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, embodiment of the present invention is made below further
Ground detailed description.
It is an important trend using the power distribution network that flexible electric electronic technology is transformed, can effectively solve conventional electrical distribution net hair
Some bottleneck problems in exhibition.Advanced power electronic technique can construct flexible, reliable, efficient power distribution network, can both be promoted
Power quality, reliability and the operational efficiency of city electric distribution system can also cope with traditional load and high proportion renewable energy
Fluctuation[1]。
Intelligent flexible switch[2]A kind of novel intelligent power electronic equipment being mounted at traditional interconnection switch, at present state
Inside and outside correlation scholar has proposed multi-terminal device, it can make the power distribution network of traditional closed-loop design open loop operation be changed to flexible closed loop fortune
Row.Conventional electrical distribution net feeder switch can only change topological structure of electric, the adjusting mould of this 0-1 by regulating switch state
Formula so that electric network swim distribution change it is limited, however after flexible switch is installed, can trend distribution between smooth adjustment feeder line,
Its advantage is mainly reflected in following several respects: 1) faster, power flow regulating ability is stronger for response speed[2,3-4]；2) power grid damage is reduced
Consumption optimizes voltage's distribiuting, improves Enhancement of Transient Voltage Stability[5-6]；3) the consumption energy of distributed generation resource, fluctuating load is improved
Power[7-8]；4) it is loaded between balanced feeder line, improves power supply capacity[9]；5) fault outage range is reduced, power supply reliability is improved[2]。
It is presently believed that flexible power distribution network (flexible distribution network, FDN) is the following power distribution network
Development an important feature and trend, therefore, the present invention by specific definition FDN, and provide its networking form, the method for operation with
And from conventional electrical distribution net transition method, technological guidance's principle is provided for the planning of later FDN.
Embodiment 1
The embodiment of the invention provides definition, networking form, the method for operation and the transition method of a kind of flexible power distribution network, ginsengs
See Fig. 1, method includes the following steps:
101: aerial net simply connected network transformation: in contact point, installation both ends flexibility Switching Station replaces interconnection switch；Cable system list
Contact transformation: flexible Switching Station is installed in looped network point, the flexible operation with closed ring of feeder line is realized by flexible Switching Station；
102: the aerial multi-joint network transformation of net: replacing traditional interconnection switch that the mode of connection is transformed with flexibility Switching Station, will be another
Outer interconnection switch closure, removes improved Redundanter schalter；The multi-joint network transformation of cable system: in looped network point transformation mode of connection peace
Flexible Switching Station is filled, interconnection switch is closed；
103: the marine tidal-current energy choice direction between three feedback lines mutually got in touch with flexible Switching Station is smoothly mutually supported, flexible
The feeder line equivalent load relative equilibrium of power distribution network, reaches balanced feeder load；
104: after feeder line outlet is broken down, feeder line gate out switch disconnects isolated fault, non-event with on-load switch is closed on
Barrier section is powered by the feeder line that flexible Switching Station interconnects；
105: when overhauling to feeder line section, successively disconnecting the block switch of maintenance area two sides, the load of block switch upstream is straight
It connects and band is turned by feeder line, the load in another block switch downstream carries out power support by the feeder line that flexible Switching Station interconnects.
Wherein, above-mentioned flexible power distribution network is defined as: closed for realizing the power distribution network of flexible operation with closed ring, including fisrt feature
Ring；Further include: second feature is flexible；
Closed loop feature can be used for avoiding having a power failure in short-term when failure or maintenance, have blocking ability to short circuit current in closed loop point；
Flexible characteristic can be used for power flowcontrol, adapt to the fluctuation of load and distributed energy；
Above-mentioned flexibility Switching Station is defined as: a multiterminal flexible apparatus, i.e., the Switching Station being made up of multiple flexible switch,
Special case of the separate unit flexible switch as flexible Switching Station；Flexible Switching Station combination conventional rigid switchs to form hybrid mode, mixing
Flexible Switching Station connects the main feeder to substation using flexible switch, is connected to secondary branch route using hard-switch
It connects.
In conclusion the embodiment of the present invention has gone out the specific definition of the improved power distribution network of flexible electric electronics, and provide
Its networking form, the method for operation and from conventional electrical distribution net transition method.There is important theoretical value and practice to answer for the invention
With value.
Embodiment 2
The scheme in embodiment 1 is further introduced below with reference to specific calculation formula, example, it is as detailed below
Description:
One, the definition of FDN
FDN is defined as can be realized the power distribution network of flexible operation with closed ring by the embodiment of the present invention.There are two features by FDN: the
One feature is closed loop, this is because FDN has blocking ability to short circuit current in closed loop point；Second feature is flexibility, i.e.,
Certain nodes have the multi-direction ability of continuously adjusting to the trend of connected multiple branches, can change to a certain degree in terms of power grid angle
Become the NATURAL DISTRIBUTION of trend.Closed loop feature allows FDN to have higher power supply reliability, can accomplish to avoid when failure or maintenance short
When have a power failure；Flexible characteristic has stronger spring tide flow-control capability by FDN, faster can broadly adapt to load and the fluctuation of DG
Property.
It can be seen that from FDN definition, it is only necessary to which Partial key network node or branch have flexible closed loop ability, so that it may structure
At FDN, this part of nodes or branch are known as Flexible Node or flexible branch.
Above-mentioned FDN define be from power distribution network functional perspective, from realize upper angle in terms of, Flexible Node or flexible branch
Key equipment be power electronic equipment.Flexible switch is substantially a kind of both ends power electronic equipment, can be by back-to-back voltage
The power electronic equipments such as source type current transformer (VSC), THE UPFC (UPFC), static synchronous series compensator (SSSC) are real
It is existing.Flexible switch is used, directly commonly used in substituting traditional switch (hereinafter referred to as hard-switch, with flexibility in feeder line liaison office
Switch is opposite), relatively it is suitble to the modification of simply connected network Connection Mode.
For multi-joint network Connection Mode, more flexible switch can be both used, it can also be higher more using joint efficiency
Hold flexible electric electronic device.Since Switching Station is widely used in existing urban power distribution network, flexible Switching Station (flexible
Switching station, FSS) it is very suitable to the networking of FDN.The core equipment of FSS is a multiterminal flexible apparatus, but from
From the point of view of distribution network engineering teacher, it is more suitable for regarding the Switching Station being made of the multiple flexible switch connected by bus as.Separate unit
Flexible switch can also regard the special case of FSS as.The concept of FSS is additionally favorable for that conventional rigid is combined to switch, using flexible switch and
The hybrid mode of hard-switch.Mix FSS to substation main feeder can using flexible switch connect, to arrive secondary branch
Route can be connected using hard-switch.
Two, the networking form of FDN and from conventional electrical distribution net transition method
Since China has been basically completed the transformation of large-scale city distribution network construction, existing network scale is very huge, phase
Have to load advanced.Therefore, the embodiment of the present invention thinks preferably from existing power distribution network Connection Mode to FDN transition and simplification
Wiring is economically set out, and FDN not substitutes hard-switch using flexible switch comprehensively, and should be in subnetwork key position
It sets using flexible switch.According to distribution network planning design technology principle, medium voltage distribution network is divided into two class of aerial net and cable system.Frame
Abortive haul Connection Mode mainly includes two kinds of contact of radiation and more segmentation appropriateness；Cable system mainly includes monocycle and two kinds bicyclic.With
Under be divided into simply connected network and multi-joint two class formation of network, provide its upgrading into the method for FDN.
A, the FDN networking form and transition method of simply connected network structure
Simply connected network in aerial net will press two feedback lines of bus to connect by an interconnection switch in difference
Come, normal open-loop operation.Upgrading is to install both ends FSS in contact point, instead of interconnection switch.Any one section after transformation
After failure, cooperate more advanced automatic technology that may accomplish that trouble point downstream is continuously powered, and reliability is further increased.It is aerial
Net simply connected network specific transformation process are as shown in Fig. 2, F in figureiIndicate feeder line i；Li,jIndicate the load on feeder line.
The upgrading of cable Single-ring network is similar to aerial net simply connected network, FSS is installed in looped network point, as shown in figure 3, in figure
Bi,jIndicate feeder line section.It knows that FSS realizes the flexible operation with closed ring of feeder line, changes the mode of traditional distribution open loop operation.
B, the FDN networking form and transition method of multi-joint network structure
Aerial net is illustrated more for being segmented two contacts, replaces traditional interconnection switch with FSS and the mode of connection is transformed, and
Other interconnection switch is closed, improved Redundanter schalter is removed.Aerial more two contact specific transformation process such as Fig. 4 of segmentation of net
It is shown.In Fig. 4, after FSS is installed, it is closed interconnection switch S1, remove Redundanter schalter S2, three feedback lines realize that flexibility is closed after transformation
Inscription of loop.
For multi-joint network in cable system by taking two cable Single-ring networks as an example, transformation process is as shown in Figure 5.In Fig. 5, installation
After FSS, it is closed interconnection switch S1、S2, improved tri- feedback line of FDN will the flexible operation with closed ring of realization.
Three, the method for operation of FDN
The working method for illustrating FDN by taking two cable Single-ring networks of three end FSS interconnection as an example is shown using the FDN transformation of Fig. 5
It is intended to.
A, normal operating mode
The improved FDN of the multi-joint network of cable system, operate normally as shown in fig. 6, in Fig. 6 A1、B1、C1Indicate three of FSS
Port.
Load is generally unevenly distributed weighing apparatus in practice, but three feedbacks due in normal operation, getting in touch with FSS phase
Marine tidal-current energy choice direction between line is smoothly mutually supported, and therefore, the feeder line equivalent load of FDN can but accomplish opposite equilibrium,
Achieve the purpose that balanced feeder load.By taking Fig. 6 as an example, three end FSS are under normal operating mode, using balanced feeder load as mesh
Mark, ideal power flow regulating strategy are as follows:
The tide flow that FSS adjusts interconnection feeder line is Δ AFj, every feedback line equivalent load is L' after adjustingFj, in which:
In formula: j, n value range are (j, n)={ (1, x), (2, y), (3, z) }；Lj,i、L1,i、L2,i、L3,iIt is load；
X, y, z is parameter, according to application settings in practice.
Equivalent load L' about feeder line jFj" ± " problem is taken, when the total load of feeder line jLess than three feedback line institute bands
The average value of loadWhen, formula takes " ﹢ " in (1), indicate that the port being connected with feeder line j absorbs power,
Opposite feeder line j is equivalent to Δ AFjLoad, therefore increase the load of feeder line j.
Otherwise it is taken " ﹣ " in formula (1), indicates that port output power, opposite feeder line j are equivalent to Δ AFjPower supply (can be in Fig. 6
Indicate the load being negative), reduce the load of feeder line j.
B, N-1 failure operation mode
The N-1 failure of the multi-joint network FDN of cable system is as shown in fig. 7, work as feeder line F1After outlet is broken down, feeder line gate out switch
Isolated fault, the feeder line F that non-faulting section is interconnected by FSS are disconnected with on-load switch is closed on2、F3Power supply.Since normal condition is to close
Therefore, after failure inscription of loop eliminates non-faulting section and has a power failure in short-term, improves power supply reliability.By taking Fig. 7 as an example, three end FSS exist
Under N-1 failure operation state, load turns band strategy and interconnects feeder line F with balanced opposite end2、F3Load is target, ideal power flow regulating
Strategy is as follows:
In the case where guaranteeing that N-1 safety check passes through, by fault feeder F1The load of institute's band all produces, then with feeder line
F1The connected port FSS output power, opposite feeder line F1It is equivalent toPower supply, output power of power supply and F1The load of institute's band is big
It is small equal；With feeder line F2、F3The connected port FSS absorbs power, opposite feeder line F2、F3It is equivalent toLoad, therefore
Increase feeder line F2、F3Load, in which:
C, maintenance run
FDN maintenance process is as shown in Figure 8.To feeder line section B1,2When maintenance, the segmentation that only need to successively disconnect maintenance area two sides is opened
Close S3And S4?.Disconnect the block switch S of maintenance area two sides3、S4Afterwards, block switch S3The load of upstream is directly by feeder line F1Turn
Band, block switch S4The feeder line F that the load in downstream is interconnected by FSS2、F3Carry out power support.
FSS is at this time with balanced feeder line F2、F3Load is target, with feeder line F1The connected port FSS output power is opposite to present
Line F1It is equivalent toPower supply, output power of power supply and block switch S4The payload in downstream is equal；With feeder line F2、F3It is connected
The port FSS absorb power, opposite feeder line F2、F3It is equivalent toLoad, therefore increase feeder line F2、F3It is negative
Lotus.Wherein:
In conclusion the embodiment of the present invention has gone out the specific definition of the improved power distribution network of flexible electric electronics, and provide
Its networking form, the method for operation and from conventional electrical distribution net transition method.There is important theoretical value and practice to answer for the invention
With value, it has been applied in the scientific research demonstration of domestic and international first multiterminal flexibility closed loop medium voltage distribution network demonstration project, in demonstration work
There is actual directive significance in journey, provide certain technological guidance for the planning of later FDN.
Embodiment 3
Feasibility verifying is carried out to the scheme in Examples 1 and 2 below with reference to Fig. 9, Tables 1 and 2, described below:
Fig. 9 power grid is by 2 110kV substations, 4 40MVA (transformer capacity unit) transformers, 12 feedback lines, 12
Equivalent load, 4 three end FSS compositions.FiIndicate feeder line i；LiIndicate the load of feeder line i institute band.A in figurei、Bi、Ci(i=1,2,
3,4) node where tri- ports FSS is indicated.
1) example data are arranged
The capacity of main transformer is 40MVA, and the capacity of feeder line is 8.92MVA, and the capacity of three ports of each FSS is
10MVA。
2) normal operating results
After installing FSS, equivalent load when FDN reaches net capability (TSC) is distributed as shown in table 1.
1 FDN of table reaches equivalent load distribution when TSC
The display of table 1, actual load and unbalanced or even feeder line F when FDN reaches TSC10、F12Load be more than feeder line appearance
Amount；But after FSS is balanced, all feeder line equivalent loads can but be accomplished fully equalize.The corresponding each FSS power flow regulating state of table 1 with
Magnitude of power is as shown in table 2.
2 port FSS adjustment state of table
As seen from Table 2, FSS1A1Port absorbs power, opposite feeder line F1It is equivalent to the load of 3.407MVA, therefore is increased
Feeder line F1Load；And B1、C1Port output power, opposite feeder line F7、F10It is equivalent to 0.275MVA's and 3.123MVA respectively
Power supply, therefore reduce feeder line F7、F10Load.FSS1Three end apparent energy algebraical sums be 0, abide by the conservation of energy.
Therefore, FDN can equally loaded well, can various actual loads distribution under reach TSC, really fully utilize
Electrical network capacity.
3) N-1 Security analysis result
Power load distributing is distributed with equivalent load of the FDN at TSC, i.e., the total load of every feedback line is 5.946MVA.It is right
FDN carries out N-1 safety analysis, the results showed that main transformer, feeder line N-1 verification pass through (note: if the total load of every feedback line is
5.946MVA, the segmentation load of every feedback line are 2.973MVA, and the N-1 safety check of conventional electrical distribution net is the results show that feeder line
It is 66.67% that N-1, which verifies percent of pass, and it is 50%, FDN logical compared to conventional electrical distribution net feeder line N-1 verification that main transformer N-1, which verifies percent of pass,
It crosses rate and improves 33.33%, main transformer N-1 verifies percent of pass and improves 50%).
Therefore, FDN can more make full use of the load margin of all interconnection ties, improve the safety of system.
4) power supply capacity
The TSC of example is 71.35MVA (71.35MVA before being transformed), but FDN can reach TSC under any power load distributing,
And traditional distribution only reaches TSC under the distribution of some specific loads, power load distributing can be very unbalanced sometimes.
Therefore, FDN can allow TSC to be easily achieved in practice, really improve power supply capacity.
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It will be appreciated by those skilled in the art that attached drawing is the schematic diagram of a preferred embodiment, the embodiments of the present invention
Serial number is for illustration only, does not represent the advantages or disadvantages of the embodiments.
The foregoing is merely presently preferred embodiments of the present invention, is not intended to limit the invention, it is all in spirit of the invention and
Within principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (3)
1. a kind of definition, networking form, the method for operation and the transition method of flexibility power distribution network, which is characterized in that the method packet
Include following steps:
Aerial net simply connected network transformation: flexible Switching Station is installed in contact point and replaces interconnection switch；
The transformation of cable system simply connected network: flexible Switching Station is installed in looped network point, is closed by the flexibility that flexible Switching Station realizes feeder line
Inscription of loop；
The aerial multi-joint network transformation of net: replace traditional interconnection switch that the mode of connection is transformed with flexibility Switching Station, by other contact
It closes the switch, removes improved Redundanter schalter；
The multi-joint network transformation of cable system: flexible Switching Station is installed in the looped network point transformation mode of connection, is closed interconnection switch；
Marine tidal-current energy choice direction between three feedback lines mutually got in touch with flexible Switching Station is smoothly mutually supported, flexible power distribution network
Feeder line equivalent load relative equilibrium, reaches balanced feeder load；
When feeder line outlet break down after, feeder line gate out switch and close on on-load switch disconnect isolated fault, non-faulting section by
The feeder line power supply of flexible Switching Station interconnection；
When to feeder line section maintenance, the block switch of maintenance area two sides is successively disconnected, the load of block switch upstream is directly by feeder line
Turn band, the load in another block switch downstream carries out power support by the feeder line that flexible Switching Station interconnects；
Wherein, above-mentioned flexible power distribution network is defined as: for realizing the power distribution network of flexible operation with closed ring, including fisrt feature closed loop；
Further include: second feature is flexible；
The closed loop feature can be used for avoiding having a power failure in short-term when failure or maintenance, have blocking ability to short circuit current in closed loop point；
The flexible characteristic can be used for power flowcontrol, adapt to the fluctuation of load and distributed energy；
The flexibility Switching Station is defined as: a multiterminal flexible apparatus, i.e., the Switching Station being made up of multiple flexible switch, separate unit
Special case of the flexible switch as flexible Switching Station；Flexible Switching Station combination conventional rigid switchs to form hybrid mode, and mixing is flexible
Switching Station connects the main feeder to substation using flexible switch, is connected to secondary branch route using hard-switch；
The method also includes:
Under normal operating condition, using balanced feeder load as target, the tide flow that flexible Switching Station adjusts interconnection feeder line is Δ AFj,
Every feedback line equivalent load is L' after adjustingFj, in which:
In formula: j, n value range are (j, n)={ (1, x), (2, y), (3, z) }；Lj,i、L1,i、L2,i、L3,iIt is load；x,y,
Z is parameter；
When the total load of feeder line jLess than the average value of three feedback line institute on-loadsWhen, it takes
" ﹢ " indicates that the port being connected with feeder line j absorbs power, and opposite feeder line j is equivalent to Δ AFjLoad, therefore increase feeder line j's
Load.
2. definition, networking form, the method for operation and the transition method of a kind of flexible power distribution network according to claim 1,
It is characterized in that, the method also includes:
Under N-1 failure operation state, using balanced opposite end interconnection feeder line F2, F3 load as target, each port power of FSS is as follows:
Wherein, in the case where guaranteeing that N-1 safety check passes through, by fault feeder F1The load of institute's band all produces, then with feeder line
F1Connected flexible opening and closing station port output power, opposite feeder line F1It is equivalent toPower supply, output power of power supply and F1Institute's band
Payload it is equal；With feeder line F2、F3The connected port FSS absorbs power, opposite feeder line F2、F3It is equivalent to's
Load, therefore increase feeder line F2、F3Load.
3. definition, networking form, the method for operation and the transition method of a kind of flexible power distribution network according to claim 2,
It is characterized in that, the method also includes:
Under inspection travel state, using balanced opposite end interconnection feeder line F2, F3 load as target, each port power of FSS is as follows:
With feeder line F1The connected port FSS output power, opposite feeder line F1It is equivalent toPower supply, output power of power supply and segmentation
Switch S4The payload in downstream is equal；With feeder line F2、F3The connected port FSS absorbs power, opposite feeder line F2、F3It is equivalent toLoad, therefore increase feeder line F2、F3Load.
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| CN107579843A (en) * | 2017-08-03 | 2018-01-12 | 天津大学 | A kind of method for the security domain models for building flexible power distribution network |
| CN108226712B (en) * | 2018-01-24 | 2020-03-24 | 国网江苏省电力有限公司苏州供电分公司 | Fault processing method for power distribution network |
| CN109307825B (en) * | 2018-10-26 | 2022-09-20 | 中国电力科学研究院有限公司 | Method and system for acquiring fault measure quantity of direct-current single-pole line of flexible direct-current power grid |
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