CN108306300A - A kind of method and system for determining THE UPFC capacity on major network section - Google Patents
A kind of method and system for determining THE UPFC capacity on major network section Download PDFInfo
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- CN108306300A CN108306300A CN201810091080.4A CN201810091080A CN108306300A CN 108306300 A CN108306300 A CN 108306300A CN 201810091080 A CN201810091080 A CN 201810091080A CN 108306300 A CN108306300 A CN 108306300A
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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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- 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
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
Abstract
The invention discloses a methods for determining THE UPFC capacity on major network section, including：Establish the data model of THE UPFC UPFC incoming transport power grids；Increase the booting quantity for the generator for sending end regions according to preset increments gradient；It is more than that the failure of itself thermostabilization limit determines Fisrt fault collection to lead to circuit in AC network structure when not acted on according to UPFC；Judge whether the primary fault collection and Fisrt fault collection are identical, the UPFC capacity eliminated needed for circuit overload is determined according to the first judging result；Judge section trnamission capacity whether reach can limit by row, determine the second judging result；Determine UPFC capacity sections transmission of electricity hoisting power curve, and the corresponding UPFC capacity of saturation point in calculated curve；Judge to determine whether the failure of UPFC capacity changes in UPFC capacity sections transmission of electricity hoisting power curve, determines third judging result, and UPFC capacity to be selected is determined according to the third judging result；Optimal UPFC capacity is determined according to the UPFC capacity to be selected.
Description
Technical field
The present invention relates to field of power, and more particularly, to one kind for determining unified tide on major network section
The method and system of stream controller capacity.
Background technology
THE UPFC (Unified Power Flow Controller, UPFC) is used as third generation flexible AC
Transmission system (Flexible AC Transmission system, FACTS) device, belongs to the combined full-controlled device of connection in series-parallel,
Most power flowcontrol problem and transmission line of electricity compensation problem can be handled, it is considered to be it is most creative, and function is most
Powerful FACTS elements.
Ability to transmit electricity limitation problem caused by for being unevenly distributed because of transmission line of electricity trend, UPFC can pass through part in series essence
Power flow transfer is realized in accurate power flowcontrol effect, and the effective power flow for overloading circuit is transferred to remaining circuit, keeps transmission cross-section each
Line power is returned less than the steady limit of heat, to improve whole ability to transmit electricity.Meanwhile relative to circuit increase-volume, newly-built passway for transmitting electricity etc.
Conventional method, UPFC is not necessarily to Large scale construction land used, and installation workload is low, is a kind of new technique means, in China south
Jingxi district looped network and Suzhou southern power grid, which have been realized, successfully to put into operation.
It is used to be promoted the application scenarios of ability to transmit electricity for UPFC, the selection of place capacity depends primarily on part in series,
Do not consider that parallel connection part participates near region electric network reactive-load voltage and coordinates control.The UPFC of different capabilities is for system total transfer capability
There is a different degrees of raising, under Power Market, the promotion of ability to transmit electricity is embodied directly in the increase of economic benefit, simultaneously
The size of UPFC installed capacities is directly related with equipment investment cost and later maintenance expense.It is, therefore, desirable to provide a kind of synthesis
Consider the optimization constant volume method of UPFC on transmission of electricity hoisting power and the major network section of system operation economic benefit.
Invention content
The present invention provides a kind of method and system for determining THE UPFC capacity on major network section, with solution
The problem of certainly how determining UPF capacity optimal on major network section.
To solve the above-mentioned problems, according to an aspect of the invention, there is provided a kind of unite for determining on major network section
The method of one flow controller capacity, the method includes：
Step 1, according to transmission cross-section with send end regions and receive end regions AC network structure and restriction section
The primary fault collection of ability to transmit electricity establishes the data model of THE UPFC UPFC incoming transport power grids；
Step 2, increase the booting quantity for the generator for sending end regions according to preset increments gradient, and reduce and receive petiolarea
The booting quantity of the generator in domain；
Step 3, it is more than the failure of itself thermostabilization limit that circuit in AC network structure is caused when not acted on according to UPFC
Determine Fisrt fault collection；
Step 4, judge whether the primary fault collection and Fisrt fault collection are identical, determine the first judging result, and according to
First judging result determines the UPFC capacity eliminated needed for circuit overload；
Step 5, judge section trnamission capacity whether reach can limit by row, determine the second judging result, if it is described second judge
As a result it is yes, then enters step 6, if second result is no, return to step 2；
Step 6, it determines UPFC capacity-section transmission of electricity hoisting power curve, and calculates the UPFC capacity-section transmission of electricity and carry
The corresponding UPFC capacity of saturation point in power per liter curve；
Step 7, judge to determine whether the failure of UPFC capacity becomes in UPFC capacity-section transmission of electricity hoisting power curve
Change, determines third judging result, and UPFC capacity to be selected is determined according to the third judging result；
Step 8, optimal UPFC capacity is determined according to the UPFC capacity to be selected.
Preferably, wherein increasing the start number for the generator for sending end regions according to preset increments gradient in the following manner
Amount, and reduce the booting quantity of receiving terminal regional generation machine：
Wherein, Δ PGiIndicate generator GiOutput knots modification, GAFor transmitting terminal regional generation machine, GBTo receive end regions
Generator, as Δ PGiFor timing, generator, which increases, contributes, and when being negative, generator, which is reduced, contributes, and j takes random natural number.
Preferably, wherein described cause when not acted on according to UPFC circuit in AC network structure to be limited more than itself thermostabilization
The failure of volume determines Fisrt fault collection, including：
The characteristics of according to AC network structure, the channel that transmission cross-section is constituted to the AC network carry out under normal mode
N-1/N-2 fault scannings, and judge in transmission cross-section circuit after the generation of these failures, if can be more than itself the steady pole of heat
Limit, will lead to circuit is more than that the failure of the steady limit of itself heat is determined as Fisrt fault collection.
Preferably, wherein described judge whether the primary fault collection and Fisrt fault collection are identical, the first judgement knot is determined
Fruit, and the UPFC capacity eliminated needed for circuit overload is determined according to first judging result, including：
If the first judging result is that the primary fault collection is identical with Fisrt fault collection, made by the power flowcontrol of UPFC
With the excess power of transfer overload circuit determines the UPFC capacity eliminated needed for circuit overload；
If the first judging result is that the primary fault collection is different with Fisrt fault collection, calculate separately under different faults collection
The first UPFC capacity and the 2nd UPFC capacity needed for circuit overload are eliminated, and selects the first UPFC capacity and the 2nd UPFC
Maximum value in capacity is as the UPFC capacity eliminated needed for circuit overload.
Preferably, the corresponding UPFC capacity of saturation point wherein UPFC capacity-section is transmitted electricity in hoisting power curve
Calculation formula be：
Wherein, x1For saturation point (x1,y1) corresponding UPFC capacity；For the UPFC capacity-section transmission of electricity hoisting power
The gradient of mid point of curve (x, y), saturation point (x1,y1) it is that gradient is maximum in the UPFC capacity-section transmission of electricity hoisting power curve
Point, if the gradient of multiple points reaches maximum value simultaneously, it is saturation point to choose the point corresponding to minimum x values.
Preferably, wherein the failure for judging to determine UPFC capacity in UPFC capacity-section transmission of electricity hoisting power curve
Whether change, determines third judging result, and UPFC capacity to be selected is determined according to the third judging result, including：
If the third judging result is to have changed, it is determined that in UPFC capacity-section transmission of electricity hoisting power curve
Inflection point, and UPFC capacity to be selected is determined according to the saturation point and the corresponding gradient of inflection point；
If the third judging result is not change, the corresponding gradient of the saturation point is UPFC capacity to be selected.
Preferably, wherein described determine UPFC capacity to be selected according to the saturation point and the corresponding gradient of inflection point, packet
It includes：
Its wherein, XUPFCFor UPFC capacity to be selected；x1For saturation point (x1,y1) corresponding UPFC capacity；g1For saturation point
(x1,y1) corresponding gradient；x2For inflection point (x2,y2) corresponding UPFC capacity；g2For saturation point (x2,y2) corresponding gradient.
Preferably, wherein described determine optimal UPFC capacity according to the UPFC capacity to be selected, including：
Judge whether the UPFC capacity to be selected meets section trnamission capacity demand, if satisfied, the then UPFC capacity to be selected
For optimal UPFC capacity；If not satisfied, then determining optimal UPFC capacity according to the promotion demand of section ability to transmit electricity.
According to another aspect of the present invention, it provides a kind of for determining THE UPFC capacity on major network section
System, the system comprises：
Model foundation unit, for according to transmission cross-section with send end regions and receive the AC network structure of end regions with
And the primary fault collection of section ability to transmit electricity is restricted, establish the data model of THE UPFC UPFC incoming transport power grids；
The quantity that is switched on changes unit, the start number for increasing the generator for sending end regions according to preset increments gradient
Amount, and reduce the booting quantity for the generator for receiving end regions；
Fisrt fault collection determination unit, it is more than that itself heat is steady that circuit in AC network structure is caused when not acted on according to UPFC
The failure of fixed limit volume determines Fisrt fault collection；
The UPFC determination units needed for circuit overload are eliminated, for judging whether are the primary fault collection and Fisrt fault collection
It is identical, determine the first judging result, and the UPFC capacity eliminated needed for circuit overload is determined according to first judging result；
Can limit by row judging unit, for judge section trnamission capacity whether reach can limit by row, determine the second judging result；
The corresponding UPFC capacity determination unit of saturation point, for when second judging result is to be, determining that UPFC holds
Amount-section transmission of electricity hoisting power curve, and the saturation point calculated in the UPFC capacity-section transmission of electricity hoisting power curve corresponds to
UPFC capacity；
UPFC capacity determination unit to be selected determines UPFC for judging in UPFC capacity-section transmission of electricity hoisting power curve
Whether the failure of capacity changes, and determines third judging result, and determine that UPFC to be selected holds according to the third judging result
Amount；
Optimal UPFC capacity determination unit, for determining optimal UPFC capacity according to the UPFC capacity to be selected.
Preferably, wherein increasing the start number for the generator for sending end regions according to preset increments gradient in the following manner
Amount, and reduce the booting quantity of receiving terminal regional generation machine：
Wherein, Δ PGiIndicate generator GiOutput knots modification, GAFor transmitting terminal regional generation machine, GBTo receive end regions
Generator, as Δ PGiFor timing, generator, which increases, contributes, and when being negative, generator, which is reduced, contributes, and j takes random natural number.
Preferably, wherein the Fisrt fault collection determination unit, is specifically used for：
The characteristics of according to AC network structure, the channel that transmission cross-section is constituted to the AC network carry out under normal mode
N-1/N-2 fault scannings, and judge in transmission cross-section circuit after the generation of these failures, if can be more than itself the steady pole of heat
Limit, will lead to circuit is more than that the failure of the steady limit of itself heat is determined as Fisrt fault collection.
Preferably, wherein the UPFC capacity determination units eliminated needed for circuit overload, are specifically used for：
If the first judging result is that the primary fault collection is identical with Fisrt fault collection, made by the power flowcontrol of UPFC
With the excess power of transfer overload circuit determines the UPFC capacity eliminated needed for circuit overload；
If the first judging result is that the primary fault collection is different with Fisrt fault collection, calculate separately under different faults collection
The first UPFC capacity and the 2nd UPFC capacity needed for circuit overload are eliminated, and selects the first UPFC capacity and the 2nd UPFC
Maximum value in capacity is as the UPFC capacity eliminated needed for circuit overload.
Preferably, wherein the corresponding UPFC capacity determination unit of the saturation point, calculates the UPFC capacity-section transmission of electricity
The formula of the corresponding UPFC capacity of saturation point in hoisting power curve is：
Wherein, x1For saturation point (x1,y1) corresponding UPFC capacity；For the UPFC capacity-section transmission of electricity hoisting power
The gradient of mid point of curve (x, y), saturation point (x1,y1) it is that gradient is maximum in the UPFC capacity-section transmission of electricity hoisting power curve
Point, if the gradient of multiple points reaches maximum value simultaneously, it is saturation point to choose the point corresponding to minimum x values.
Preferably, wherein the UPFC capacity determination unit to be selected, is specifically used for：
If the third judging result is to have changed, it is determined that in UPFC capacity-section transmission of electricity hoisting power curve
Inflection point, and UPFC capacity to be selected is determined according to the saturation point and the corresponding gradient of inflection point；
If the third judging result is not change, the corresponding gradient of the saturation point is UPFC capacity to be selected.
Preferably, wherein described determine UPFC capacity to be selected according to the saturation point and the corresponding gradient of inflection point, packet
It includes：
Wherein, XUPFCFor UPFC capacity to be selected；x1For saturation point (x1,y1) corresponding UPFC capacity；g1For saturation point (x1,
y1) corresponding gradient；x2For inflection point (x2,y2) corresponding UPFC capacity；g2For saturation point (x2,y2) corresponding gradient.
Preferably, wherein the optimal UPFC capacity determination unit, is specifically used for：
Judge whether the UPFC capacity to be selected meets section trnamission capacity demand, if satisfied, the then UPFC capacity to be selected
For optimal UPFC capacity；If not satisfied, then determining optimal UPFC capacity according to the promotion demand of section ability to transmit electricity.
The present invention provides a kind of method and system for determining THE UPFC capacity on major network section, can
It is used to be promoted the application scenarios of section transmission capacity for UPFC, determines under the premise of meeting transmission of electricity demand, can realize warp
The UPFC capacity of Ji maximizing the benefits.The present invention can provide foundation for the constant volume problem of UPFC in Practical Project, be UPFC works
The Electric Power Network Planning of journey access provides reference.
Description of the drawings
By reference to the following drawings, exemplary embodiments of the present invention can be more fully understood by：
Fig. 1 is the method for determining THE UPFC capacity on major network section according to embodiment of the present invention
100 flow chart；
Fig. 2 is to press operation grid structure graph structure to show according to Qinghai-Henan extra-high voltage direct-current half of embodiment of the present invention
It is intended to；
Fig. 3 is according to double loop active power change curve after Huiji-Huojia County's N-1 failures of embodiment of the present invention；
Fig. 4 is the song according to correspondence between the UPFC capacity and section transmitted power lifting capacity of embodiment of the present invention
Line；
Fig. 5 is according to changed power curve before and after the tower of embodiment of the present invention paving-auspicious symbol N-1 failures installing UPFC；
Fig. 6 is changed power curve before and after Huiji-Huojia County's N-1 failures installing UPFC according to embodiment of the present invention；With
And
Fig. 7 is the system for determining THE UPFC capacity on major network section according to embodiment of the present invention
700 structural schematic diagram.
Specific implementation mode
Exemplary embodiments of the present invention are introduced referring now to the drawings, however, the present invention can use many different shapes
Formula is implemented, and is not limited to the embodiment described herein, and to provide these embodiments be to disclose at large and fully
The present invention, and fully convey the scope of the present invention to person of ordinary skill in the field.Show for what is be illustrated in the accompanying drawings
Term in example property embodiment is not limitation of the invention.In the accompanying drawings, identical cells/elements use identical attached
Icon is remembered.
Unless otherwise indicated, term (including scientific and technical terminology) used herein has person of ordinary skill in the field
It is common to understand meaning.Further it will be understood that with the term that usually used dictionary limits, should be understood as and its
The context of related field has consistent meaning, and is not construed as Utopian or too formal meaning.
Fig. 1 is the method for determining THE UPFC capacity on major network section according to embodiment of the present invention
100 flow chart.As shown in Figure 1, embodiment of the present invention offer is used to determine on major network section that THE UPFC to be held
The method of amount can be directed to the application scenarios that UPFC is used to be promoted section transmission capacity, determine in the premise for meeting transmission of electricity demand
Under, it can realize the UPFC capacity of maximization of economic benefit.The present invention can provide for the constant volume problem of UPFC in Practical Project
Foundation, the Electric Power Network Planning for the access of UPFC engineerings provide reference.Embodiment of the present invention is used to determine unification on major network section
The method 100 of flow controller capacity is since step 101 place, in step 101, according to transmission cross-section with send end regions and connect
By the AC network structure of end regions and the primary fault collection of restriction section ability to transmit electricity, THE UPFC UPFC is established
The data model of incoming transport power grid.Power system simulation software is used in the embodiment of this hair invention, it is disconnected according to transmission of electricity
Face and receiving end AC network structure is sent, and consider to restrict the primary fault collection of section ability to transmit electricity, builds UPFC incoming transport electricity
The flow data model of net stablizes data model.
Preferably, in step 102, increase the booting quantity for the generator for sending end regions according to preset increments gradient, and
Reduce the booting quantity for the generator for receiving end regions.
Preferably, wherein increasing the start number for the generator for sending end regions according to preset increments gradient in the following manner
Amount, and reduce the booting quantity of receiving terminal regional generation machine：
Wherein, Δ PGiIndicate generator GiOutput knots modification, GAFor transmitting terminal regional generation machine, GBTo receive end regions
Generator, as Δ PGiFor timing, generator, which increases, contributes, and when being negative, generator, which is reduced, contributes, and j takes random natural number.
Preferably, it is more than itself thermostabilization that circuit in AC network structure is caused in step 103, when not acted on according to UPFC
The failure of limit determines Fisrt fault collection.
Preferably, wherein described cause when not acted on according to UPFC circuit in AC network structure to be limited more than itself thermostabilization
The failure of volume determines Fisrt fault collection, including：
The characteristics of according to AC network structure, the channel that transmission cross-section is constituted to the AC network carry out under normal mode
N-1/N-2 fault scannings, and judge in transmission cross-section circuit after the generation of these failures, if can be more than itself the steady pole of heat
Limit, will lead to circuit is more than that the failure of the steady limit of itself heat is determined as Fisrt fault collection.
Preferably, in step 104, judge whether the primary fault collection and Fisrt fault collection are identical, determine the first judgement
As a result, and determining the UPFC capacity eliminated needed for circuit overload according to first judging result.
Preferably, wherein described judge whether the primary fault collection and Fisrt fault collection are identical, the first judgement knot is determined
Fruit, and the UPFC capacity eliminated needed for circuit overload is determined according to first judging result, including：If the first judging result is
The primary fault collection is identical with Fisrt fault collection, then is acted on by the power flowcontrol of UPFC, the superfluous work(of transfer overload circuit
Rate determines the UPFC capacity eliminated needed for circuit overload；If the first judging result is the primary fault collection and Fisrt fault collection
Difference then calculates separately the first UPFC capacity and the 2nd UPFC capacity eliminated under different faults collection needed for circuit overload, and selects
The maximum value in the first UPFC capacity and the 2nd UPFC capacity is selected as the UPFC capacity eliminated needed for circuit overload.
If primary fault collection is identical with Fisrt fault collection, illustrates that the failure for limiting section ability to transmit electricity is constant, then pass through
The power flowcontrol of UPFC acts on, and the excess power of transfer overload circuit can both calculate the UPFC eliminated needed for circuit overload
Capacity.
If primary fault collection and Fisrt fault collection differ, illustrate the raising with section trnamission capacity, and occurs making new
Circuit be more than the steady limit of heat failure, then calculate separately the UPFC capacity eliminated under different faults collection needed for circuit overload, and
Select the maximum value in the two as the UPFC capacity eliminated needed for circuit overload.
Preferably, in step 105, judge section trnamission capacity whether reach can limit by row, the second judging result is determined, if institute
It is yes to state the second judging result, then enters step 106, if second result is no, return to step 102.
Judge section trnamission capacity whether reach can limit by row, i.e. can failure by UPFC technologies make whole circuits after occurring
Power be less than itself thermostabilization limit, if UPFC technologies are unable to control, i.e., section trnamission capacity have reached can limit by row, then stop counting
It calculates.If all line powers of section can be made to meet thermostabilization limit by UPFC technologies, feasible pole has not yet been reached in section trnamission capacity
Limit, then continue growing booting amount.
Preferably, in step 106, UPFC capacity-section transmission of electricity hoisting power curve is determined, and calculate the UPFC and hold
The corresponding UPFC capacity of saturation point in amount-section transmission of electricity hoisting power curve.
Preferably, the corresponding UPFC capacity of saturation point wherein UPFC capacity-section is transmitted electricity in hoisting power curve
Calculation formula be：
Wherein, x1For saturation point (x1,y1) corresponding UPFC capacity；For the UPFC capacity-section transmission of electricity hoisting power
The gradient of mid point of curve (x, y), saturation point (x1,y1) it is that gradient is maximum in the UPFC capacity-section transmission of electricity hoisting power curve
Point, if the gradient of multiple points reaches maximum value simultaneously, it is saturation point to choose the point corresponding to minimum x values.
In embodiments of the present invention, when drawing UPFC capacity-section transmission of electricity hoisting power curve, horizontal axis UPFC
Capacity, wherein numerical value indicate that unit MVA, the longitudinal axis is section transmission of electricity hoisting power with x, and wherein numerical value indicates that unit is with y
MW.By saturation point (x1,y1) corresponding to UPFC capability values x1Alternately.
Preferably, in step 107, judge the event that UPFC capacity is determined in UPFC capacity-section transmission of electricity hoisting power curve
Whether barrier changes, and determines third judging result, and determine UPFC capacity to be selected according to the third judging result.
Preferably, wherein the failure for judging to determine UPFC capacity in UPFC capacity-section transmission of electricity hoisting power curve
Whether change, determines third judging result, and UPFC capacity to be selected is determined according to the third judging result, including：
If the third judging result is to have changed, it is determined that in UPFC capacity-section transmission of electricity hoisting power curve
Inflection point, and UPFC capacity to be selected is determined according to the saturation point and the corresponding gradient of inflection point；
If the third judging result is not change, the corresponding gradient of the saturation point is UPFC capacity to be selected.
Preferably, wherein described determine UPFC capacity to be selected according to the saturation point and the corresponding gradient of inflection point, packet
It includes：
Wherein, XUPFCFor UPFC capacity to be selected；x1For saturation point (x1,y1) corresponding UPFC capacity；g1For saturation point (x1,
y1) corresponding gradient；x2For inflection point (x2,y2) corresponding UPFC capacity；g2For saturation point (x2,y2) corresponding gradient.Due to leading
Cause section heat it is steady check not by the more initial scene of failure increase, while determining that the fault scenes of UPFC capacity change,
Then curve will appear more apparent inflection point.
In embodiments of the present invention, if the only corresponding x of saturation point1One chosen candidate value, then UPFC capacity choosing to be selected
For x1MVA.If there are the corresponding x of saturation point1X corresponding with inflection point2Two chosen candidate values, then the x values for selecting corresponding gradient larger for
UPFC capacity to be selected.If x1、x2Gradient is equal, then smaller x values are UPFC capacity to be selected preferably wherein.Calculation formula is：
Wherein, xUPFCFor selected UPFC capacity,
Preferably, in step 108, optimal UPFC capacity is determined according to the UPFC capacity to be selected.
Preferably, wherein described determine optimal UPFC capacity according to the UPFC capacity to be selected, including：
Judge whether the UPFC capacity to be selected meets section trnamission capacity demand, if satisfied, the then UPFC capacity to be selected
For optimal UPFC capacity；If not satisfied, then determining optimal UPFC capacity according to the promotion demand of section ability to transmit electricity.
If section transmission capacity demand is higher, chosen after curve saturation point or inflection point according to demand, i.e., section is promoted
Power corresponding UPFC capability values in curve, should not choose more capacity UPFC, because economic benefit is relatively poor.
The embodiment illustrated the present invention in detail below
Embodiments of the present invention are by taking section in Henan north-Henan in half pressure operation rack of Qinghai-Henan extra-high voltage direct-current as an example.
1. building the data mould of UPFC incoming transport power grids.
Fig. 2 is to press operation grid structure graph structure to show according to Qinghai-Henan extra-high voltage direct-current half of embodiment of the present invention
It is intended to.As shown in Fig. 2, section is existing by the Huojia County 500kV-Huiji double loop and the auspicious symbol double loops of Ta Pu-totally four loop line in Henan north-Henan
Composition.The Henan north power transmission limit is limited by the steady limit of heat, and another time line power reaches after 500kV towers one line down of paving-auspicious symbol
1922.2MW is more than to overheat the limitation of the steady limit (1920MW), therefore the limit of section is 4701.6MW in the Henan Bei Song, Henan, at this time
Huojia County-Huiji double back linear heat generation rate 2188.2MW, tower paving-auspicious symbol double loop 2513.4MW.PSD- is utilized in the embodiment of invention
BPA simulation softwares establish Qinghai-Henan extra-high voltage direct-current half and press operation rack data, and in the auspicious symbol double-circuit line installings of Ta Pu-
UPFC, parallel connected end is in the sides Ta Pu, and system reference capacity takes 100MVA, and it is the mark referred to that device parameter, which takes with system reference capacity,
One value.
2. increasing the booting for the generator for sending end regions.
After data model establishes, increase the booting amount of the generator in Henan north, while accordingly reducing in Henan, the hair in Henan south
The booting amount of motor is to increase gradient with 50MW, and section highest hoisting power is up to 1050MW, Huojia County-Huiji double loop at this time
Power is up to 2807.7MW, and tower paving-auspicious symbol double back linear heat generation rate is up to 2911.1MW.
3. loop line road is more than the failure of the steady limit of heat when structure UPFC is not acted on.
Fig. 3 is according to double loop active power change curve after Huiji-Huojia County's N-1 failures of embodiment of the present invention.Such as
Shown in Fig. 3, when booting amount is less than 300MW, fault set is primary fault collection, i.e., another after one line down of 500kV towers paving-auspicious symbol
A time line power is more than the limitation of the steady limit (1920MW) of heat；When booting amount is more than 300MW, hot steady verification is caused not pass through
Failure increase, except tower paving-auspicious symbol double loop N-1 verification is not in addition to, another time after the Huijis 500kV-one line down of Huojia County
Line power reaches 1939.8MW, is more than the limitation for overheating the steady limit (1920MW).
4. calculating the UPFC eliminated needed for circuit overload to hold.
When tower paving-auspicious symbol N-1 failures, tower paving-auspicious symbol line power is reduced by the power flowcontrol effect of UPFC, makes to break
Face passes through hot steady verification；When Huiji-Huojia County's N-1 failures, on the basis of natural power, it is active to improve tower paving-auspicious symbol double loop
Power, makes Huiji-Huojia County's excess power be transferred to circuit where UPFC, and Huiji-Huojia County's non-fault line power is less than 1920MW.
The final peak for choosing required UPFC capacity in the case of two kinds is as the UPFC capacity eliminated needed for circuit overload.
5. determining UPFC capacity-section transmission of electricity hoisting power curve, and it is bent to calculate UPFC capacity-section transmission of electricity hoisting power
The gradient of saturation point and inflection point in line.
Fig. 4 is the song according to correspondence between the UPFC capacity and section transmitted power lifting capacity of embodiment of the present invention
Line.As shown in figure 4, UPFC capacity-section transmission of electricity hoisting power curve that embodiments of the present invention are drawn according to result of calculation
Horizontal axis be UPFC capacity, unit MVA, the longitudinal axis be section transmit electricity hoisting power, unit MW.UPFC appearances can be obtained by being computed
Amount-section transmission of electricity hoisting power mid point of curve (138,650) is saturation point, and Grad is up to 4.71, i.e. x1=138, g1=
4.72.Meanwhile as Fig. 4 shows, curve graph is divided into three phases：The fault set in stage 1 is that tower paving-auspicious symbol N-1 verifications do not pass through, certainly
The failure for determining UPFC capacity is tower paving-auspicious symbol N-1 failures；The fault set in stage 2 be tower paving-it is auspicious symbol, Huiji-Huojia County N-1 not
Pass through, but determines that the failure of UPFC capacity is still tower paving-auspicious symbol N-1 failures；The fault set in stage 3 is tower paving-auspicious symbol, favour
Ji-Huojia County N-1 does not pass through, determines that the failure of UPFC capacity is Huiji-Huojia County's N-1 failures.Therefore, UPFC capacity-section is defeated
Electric hoisting power knee of curve is (138,650), i.e. x2=138, g2=4.72.
6. determining optimal UPFC capacity.
UPFC capacity-section transmission of electricity of section carries in Henan north-Henan in Qinghai-Henan extra-high voltage direct-current half presses operation rack
In power per liter curve, saturation point (x1,y1) and inflection point (x2,y2) belong to same point, therefore choose optimal UPFC capacity and be
138MVA, specially series side respectively install 64MVA additional, share parallel connection side 10MVA.UPFC control effects are respectively such as Fig. 5 and Fig. 6 institutes
Show.Wherein, Fig. 5 is according to changed power curve before and after the tower of embodiment of the present invention paving-auspicious symbol N-1 failures installing UPFC.Fig. 6
For according to changed power curve before and after the Huiji of embodiment of the present invention-Huojia County's N-1 failures installing UPFC.
7. judging that can optimal UPFC capacity meet section transmission capacity requirement.
In embodiments of the present invention, it when UPFC capacity is 138MVA, can be promoted by accurately power control capabilities
Section transmitted power 650MW meets the demand that electricity is conveyed in Henan north-Henan.
Fig. 7 is the system for determining THE UPFC capacity on major network section according to embodiment of the present invention
700 structural schematic diagram.As shown with 7, what embodiment of the present invention provided is used to determine THE UPFC on major network section
The system 700 of capacity includes：Model foundation unit 701, booting quantity change unit 702, Fisrt fault collection determination unit 703,
Eliminate UPFC determination units 704 needed for circuit overload, can limit by row judging unit 705, the corresponding UPFC capacity of saturation point it is true
Order member 706, UPFC capacity determination unit 707 to be selected and optimal UPFC capacity determination unit 708.Preferably, in the model
Establish unit, for according to transmission cross-section with send end regions and receive end regions AC network structure and restriction section it is defeated
The primary fault collection of electric energy power establishes the data model of THE UPFC UPFC incoming transport power grids.
Preferably, change unit 702 in the booting quantity, increase the power generation for sending end regions according to preset increments gradient
The booting quantity of machine, and reduce the booting quantity for the generator for receiving end regions.
Preferably, wherein increasing the start number for the generator for sending end regions according to preset increments gradient in the following manner
Amount, and reduce the booting quantity of receiving terminal regional generation machine：
Wherein, Δ PGiIndicate generator GiOutput knots modification, GAFor transmitting terminal regional generation machine, GBTo receive end regions
Generator, as Δ PGiFor timing, generator, which increases, contributes, and when being negative, generator, which is reduced, contributes, and j takes random natural number.
Preferably, in the Fisrt fault collection determination unit 703, cause when not acted on according to UPFC in AC network structure
Circuit is more than that the failure of itself thermostabilization limit determines Fisrt fault collection.
Preferably, wherein the Fisrt fault collection determination unit, is specifically used for：It is the characteristics of according to AC network structure, right
The AC network constitutes the N-1/N-2 fault scannings under the channel progress normal mode of transmission cross-section, and judges transmission cross-section
Middle circuit is after the generation of these failures, if can be more than itself steady limit of heat, will lead to circuit is more than the event of the steady limit of itself heat
Barrier is determined as Fisrt fault collection.
Preferably, the UPFC determination units 704 needed for the elimination circuit overload, judge the primary fault collection and the
Whether one fault set is identical, determines the first judging result, and determine and eliminated needed for circuit overload according to first judging result
UPFC capacity.
Preferably, wherein the UPFC capacity determination units eliminated needed for circuit overload, are specifically used for：If first judges
As a result it is that the primary fault collection is identical with Fisrt fault collection, then is acted on by the power flowcontrol of UPFC, transfer overload circuit
Excess power determines the UPFC capacity eliminated needed for circuit overload；If the first judging result is the primary fault collection and first
Fault set is different, then calculates separately the first UPFC capacity and the 2nd UPFC appearances eliminated under different faults collection needed for circuit overload
Amount, and the maximum value in the first UPFC capacity and the 2nd UPFC capacity is selected to hold as the UPFC eliminated needed for circuit overload
Amount.
Preferably, it is described can limit by row judging unit 705, judge section trnamission capacity whether reach can limit by row, determine
Second judging result.
Preferably, in the corresponding UPFC capacity determination unit 706 of the saturation point, when second judging result is yes
When, determine UPFC capacity-section transmission of electricity hoisting power curve, and calculate the UPFC capacity-section transmission of electricity hoisting power curve
In the corresponding UPFC capacity of saturation point.
Preferably, wherein the corresponding UPFC capacity determination unit 706 of the saturation point, calculates the UPFC capacity-section
The formula of the corresponding UPFC capacity of saturation point in transmission of electricity hoisting power curve is：
Wherein, x1For saturation point (x1,y1) corresponding UPFC capacity；For the UPFC capacity-section transmission of electricity hoisting power
The gradient of mid point of curve (x, y), saturation point (x1,y1) it is that gradient is maximum in the UPFC capacity-section transmission of electricity hoisting power curve
Point, if the gradient of multiple points reaches maximum value simultaneously, it is saturation point to choose the point corresponding to minimum x values.
Preferably, in the UPFC capacity determination unit 707 to be selected, judge that UPFC capacity-section transmission of electricity hoisting power is bent
It determines whether the failure of UPFC capacity changes in line, determines third judging result, and true according to the third judging result
Fixed UPFC capacity to be selected.
Preferably, wherein the UPFC capacity determination unit to be selected, is specifically used for：If the third judging result is to have sent out
Changing, it is determined that the inflection point in UPFC capacity-section transmission of electricity hoisting power curve, and distinguished according to the saturation point and inflection point
Corresponding gradient determines UPFC capacity to be selected；If the third judging result is not change, the saturation point is corresponding
Gradient is UPFC capacity to be selected.Preferably, wherein it is described determined according to the saturation point and the corresponding gradient of inflection point it is to be selected
UPFC capacity, including：
Wherein, XUPFCFor UPFC capacity to be selected；x1For saturation point (x1,y1) corresponding UPFC capacity；g1For saturation point (x1,
y1) corresponding gradient；x2For inflection point (x2,y2) corresponding UPFC capacity；g2For saturation point (x2,y2) corresponding gradient.
Preferably, in the optimal UPFC capacity determination unit 208, optimal UPFC is determined according to the UPFC capacity to be selected
Capacity.
Preferably, wherein the optimal UPFC capacity determination unit, is specifically used for：Whether judge the UPFC capacity to be selected
Meet section trnamission capacity demand, if satisfied, then the UPFC capacity to be selected is optimal UPFC capacity；If if not satisfied, being then discontented with
Foot, then determine optimal UPFC capacity according to the promotion demand of section ability to transmit electricity.
The system 700 and the present invention for determining THE UPFC capacity on major network section of the embodiment of the present invention
Another embodiment for determining that the method 100 of THE UPFC capacity on major network section is corresponding, herein no longer
It repeats.
The present invention is described by reference to a small amount of embodiment.However, it is known in those skilled in the art, as
Defined by subsidiary Patent right requirement, in addition to the present invention other embodiments disclosed above are equally fallen the present invention's
In range.
Normally, all terms used in the claims are all solved according to them in the common meaning of technical field
It releases, unless in addition clearly being defined wherein.All references " one/described/be somebody's turn to do [device, component etc.] " are all opened ground
It is construed at least one of described device, component etc. example, unless otherwise expressly specified.Any method disclosed herein
Step need not all be run with disclosed accurate sequence, unless explicitly stated otherwise.
Claims (16)
1. a kind of method for determining THE UPFC capacity on major network section, which is characterized in that the method includes：
Step 1, according to transmission cross-section with send end regions and receive end regions AC network structure and restrict section transmit electricity
The primary fault collection of ability establishes the data model of THE UPFC UPFC incoming transport power grids；
Step 2, increase the booting quantity for the generator for sending end regions according to preset increments gradient, and reduce and receive end regions
The booting quantity of generator；
Step 3, it is more than that the failure of itself thermostabilization limit determines that circuit in AC network structure is caused when not acted on according to UPFC
Fisrt fault collection；
Step 4, judge whether the primary fault collection and Fisrt fault collection are identical, determine the first judging result, and according to described
First judging result determines the UPFC capacity eliminated needed for circuit overload；
Step 5, judge section trnamission capacity whether reach can limit by row, the second judging result is determined, if second judging result
It is yes, then enters step 6, if second result is no, return to step 2；
Step 6, it determines UPFC capacity-section transmission of electricity hoisting power curve, and calculates the UPFC capacity-section transmission of electricity and promote work(
The corresponding UPFC capacity of saturation point in rate curve；
Step 7, judge to determine whether the failure of UPFC capacity changes in UPFC capacity-section transmission of electricity hoisting power curve,
It determines third judging result, and UPFC capacity to be selected is determined according to the third judging result；
Step 8, optimal UPFC capacity is determined according to the UPFC capacity to be selected.
2. according to the method described in claim 1, being sent it is characterized in that, being increased in the following manner according to preset increments gradient
The booting quantity of the generator of end regions, and reduce the booting quantity of receiving terminal regional generation machine：
Wherein, Δ PGiIndicate generator GiOutput knots modification, GAFor transmitting terminal regional generation machine, GBFor receiving terminal regional generation
Machine, as Δ PGiFor timing, generator, which increases, contributes, and when being negative, generator, which is reduced, contributes, and j takes random natural number.
3. according to the method described in claim 1, it is characterized in that, described lead to AC network structure when not acted on according to UPFC
Middle circuit determines Fisrt fault collection more than the failure of itself thermostabilization limit, including：
The characteristics of according to AC network structure, constitutes the AC network N- under the channel progress normal mode of transmission cross-section
1/N-2 fault scannings, and judge that circuit is after the generation of these failures in transmission cross-section, if can be more than itself steady limit of heat, it will
It is more than that the failure of the steady limit of itself heat is determined as Fisrt fault collection to lead to circuit.
4. according to the method described in claim 1, it is characterized in that, described judge that the primary fault collection and Fisrt fault collection are
It is no identical, determine the first judging result, and the UPFC capacity eliminated needed for circuit overload is determined according to first judging result,
Including：
If the first judging result is that the primary fault collection is identical with Fisrt fault collection, acted on by the power flowcontrol of UPFC,
The excess power of transfer overload circuit, determines the UPFC capacity eliminated needed for circuit overload；
If the first judging result is that the primary fault collection is different with Fisrt fault collection, calculates separately and eliminated under different faults collection
The first UPFC capacity needed for circuit overload and the 2nd UPFC capacity, and select the first UPFC capacity and the 2nd UPFC capacity
In maximum value as eliminate circuit overload needed for UPFC capacity.
5. according to the method described in claim 1, it is characterized in that, in UPFC capacity-section transmission of electricity hoisting power curve
The calculation formula of the corresponding UPFC capacity of saturation point be：
Wherein, x1For saturation point (x1,y1) corresponding UPFC capacity；For the UPFC capacity-section transmission of electricity hoisting power curve
The gradient at midpoint (x, y), saturation point (x1,y1) it is that gradient is maximum in the UPFC capacity-section transmission of electricity hoisting power curve
Point, if the gradient of multiple points reaches maximum value simultaneously, it is saturation point to choose the point corresponding to minimum x values.
6. according to the method described in claim 1, it is characterized in that, the judgement UPFC capacity-section transmission of electricity hoisting power is bent
It determines whether the failure of UPFC capacity changes in line, determines third judging result, and true according to the third judging result
Fixed UPFC capacity to be selected, including：
If the third judging result is to have changed, it is determined that turning in UPFC capacity-section transmission of electricity hoisting power curve
Point, and UPFC capacity to be selected is determined according to the saturation point and the corresponding gradient of inflection point；
If the third judging result is not change, the corresponding gradient of the saturation point is UPFC capacity to be selected.
7. according to the method described in claim 6, it is characterized in that, described according to the saturation point and the corresponding ladder of inflection point
Degree determines UPFC capacity to be selected, including：
Wherein, XUPFCFor UPFC capacity to be selected；x1For saturation point (x1,y1) corresponding UPFC capacity；g1For saturation point (x1,y1) right
The gradient answered；x2For inflection point (x2,y2) corresponding UPFC capacity；g2For saturation point (x2,y2) corresponding gradient.
8. according to the method described in claim 1, it is characterized in that, described determine optimal UPFC according to the UPFC capacity to be selected
Capacity, including：
Judge whether the UPFC capacity to be selected meets section trnamission capacity demand, if satisfied, then the UPFC capacity to be selected is most
Excellent UPFC capacity；If not satisfied, then determining optimal UPFC capacity according to the promotion demand of section ability to transmit electricity.
9. a kind of system for determining THE UPFC capacity on major network section, which is characterized in that the system comprises：
Model foundation unit, for according to transmission cross-section and transmission end regions and the AC network structure and system that receive end regions
The about primary fault collection of section ability to transmit electricity establishes the data model of THE UPFC UPFC incoming transport power grids；
The quantity that is switched on changes unit, the booting quantity for increasing the generator for sending end regions according to preset increments gradient, and
Reduce the booting quantity for the generator for receiving end regions；
Fisrt fault collection determination unit causes circuit in AC network structure to be limited more than itself thermostabilization when not acted on according to UPFC
The failure of volume determines Fisrt fault collection；
Eliminate the UPFC determination units needed for circuit overload, for judge the primary fault collection and Fisrt fault collection whether phase
Together, it determines the first judging result, and determines the UPFC capacity eliminated needed for circuit overload according to first judging result；
Can limit by row judging unit, for judge section trnamission capacity whether reach can limit by row, determine the second judging result；
The corresponding UPFC capacity determination unit of saturation point, for when second judging result is to be, determining that UPFC capacity-is disconnected
Face transmission of electricity hoisting power curve, and the saturation point calculated in the UPFC capacity-section transmission of electricity hoisting power curve is corresponding
UPFC capacity；
UPFC capacity determination unit to be selected determines UPFC capacity for judging in UPFC capacity-section transmission of electricity hoisting power curve
Failure whether change, determine third judging result, and UPFC capacity to be selected is determined according to the third judging result；
Optimal UPFC capacity determination unit, for determining optimal UPFC capacity according to the UPFC capacity to be selected.
10. system according to claim 9, which is characterized in that increased according to preset increments gradient send out in the following manner
The booting quantity of the generator in sending end region, and reduce the booting quantity of receiving terminal regional generation machine：
Wherein, Δ PGiIndicate generator GiOutput knots modification, GAFor transmitting terminal regional generation machine, GBFor receiving terminal regional generation
Machine, as Δ PGiFor timing, generator, which increases, contributes, and when being negative, generator, which is reduced, contributes, and j takes random natural number.
11. system according to claim 9, which is characterized in that the Fisrt fault collection determination unit is specifically used for：
The characteristics of according to AC network structure, constitutes the AC network N- under the channel progress normal mode of transmission cross-section
1/N-2 fault scannings, and judge that circuit is after the generation of these failures in transmission cross-section, if can be more than itself steady limit of heat, it will
It is more than that the failure of the steady limit of itself heat is determined as Fisrt fault collection to lead to circuit.
12. system according to claim 9, which is characterized in that the UPFC capacity eliminated needed for circuit overload determines
Unit is specifically used for：
If the first judging result is that the primary fault collection is identical with Fisrt fault collection, acted on by the power flowcontrol of UPFC,
The excess power of transfer overload circuit, determines the UPFC capacity eliminated needed for circuit overload；
If the first judging result is that the primary fault collection is different with Fisrt fault collection, calculates separately and eliminated under different faults collection
The first UPFC capacity needed for circuit overload and the 2nd UPFC capacity, and select the first UPFC capacity and the 2nd UPFC capacity
In maximum value as eliminate circuit overload needed for UPFC capacity.
13. system according to claim 9, which is characterized in that the corresponding UPFC capacity determination unit of the saturation point, meter
The formula for calculating the corresponding UPFC capacity of saturation point in the UPFC capacity-section transmission of electricity hoisting power curve is：
Wherein, x1For saturation point (x1,y1) corresponding UPFC capacity；For the UPFC capacity-section transmission of electricity hoisting power curve
The gradient at midpoint (x, y), saturation point (x1,y1) it is that gradient is maximum in the UPFC capacity-section transmission of electricity hoisting power curve
Point, if the gradient of multiple points reaches maximum value simultaneously, it is saturation point to choose the point corresponding to minimum x values.
14. system according to claim 9, which is characterized in that the UPFC capacity determination unit to be selected is specifically used for：
If the third judging result is to have changed, it is determined that turning in UPFC capacity-section transmission of electricity hoisting power curve
Point, and UPFC capacity to be selected is determined according to the saturation point and the corresponding gradient of inflection point；
If the third judging result is not change, the corresponding gradient of the saturation point is UPFC capacity to be selected.
15. system according to claim 14, which is characterized in that described corresponding according to the saturation point and inflection point
Gradient determines UPFC capacity to be selected, including：
Wherein, XUPFCFor UPFC capacity to be selected；x1For saturation point (x1,y1) corresponding UPFC capacity；g1For saturation point (x1,y1) right
The gradient answered；x2For inflection point (x2,y2) corresponding UPFC capacity；g2For saturation point (x2,y2) corresponding gradient.
16. system according to claim 9, which is characterized in that the optimal UPFC capacity determination unit is specifically used for：
Judge whether the UPFC capacity to be selected meets section trnamission capacity demand, if satisfied, then the UPFC capacity to be selected is most
Excellent UPFC capacity；If not satisfied, then determining optimal UPFC capacity according to the promotion demand of section ability to transmit electricity.
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