CN106451414B - A kind of bulk power grid emergency state control aid decision-making method based on dynamic partition - Google Patents
A kind of bulk power grid emergency state control aid decision-making method based on dynamic partition Download PDFInfo
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Classifications
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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
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- G—PHYSICS
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- G06Q50/00—Systems or methods specially adapted for specific business sectors, e.g. utilities or tourism
- G06Q50/06—Electricity, gas or water supply
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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
- H02J3/001—Methods to deal with contingencies, e.g. abnormalities, faults or failures
Abstract
The invention discloses a kind of bulk power grid emergency state control aid decision-making method based on dynamic partition, belongs to technical field of power system operation control.The present invention obtains feasible dynamic partition scheme automatically, obtains optimal control program according to dynamic partition quantitatively evaluating index system for multiple feasible programs.This method is coordinated to consider that economy, reliability and safety quickly, accurately provide optimal dynamic partition control program for the power grid unitary class and the multiclass state of emergency under current state and forecast failure.The present invention can provide correct aid decision suggestion, guarantee power network safety operation.
Description
Technical field
The invention belongs to technical field of power system operation control, it particularly relates to a kind of based on the big of dynamic partition
Power grid emergency state control aid decision-making method.
Background technique
As building up for extra-high voltage alternating current-direct current route is put into operation, the pattern of the transregional transmission of electricity of large capacity is gradually formed.Transregional interconnection
Power grid further enhances the dynamical couple characteristic between each regional power grid, and partial electric grid failure is to large regional grid security and stability
It influences bigger.When power grid enters the state of emergency, if implementing to take control measure not in time, it would be possible to cause cascading failure, make
At the generation of large-scale blackout.
The operation control means of power grid two class of classification from implementation at present, one kind are gone out by changing generator
Power and workload demand dynamic adjustment grid operation mode, one kind are to change trend using power electronic equipment to be distributed.With cut machine-cut
The two traditional three lines of defence measures such as load, off-the-line are compared, and load transfer only changes the topological structure of network in a small range, just
The pass for subtracting and having caused researchers at home and abroad for load proportion, significant effect, high reliablity can largely be reduced
Note.
In this context, the dynamic partition skill including load transfer can be utilized when power grid is in a state of emergency
Art reasonably adjusts partition network structure, and then controls trend, the voltage etc. of related elements, and power grid is made to exit urgent shape
State is to keep safety and stability to have certain meaning in holding power grid.It is directed to apparatus overload, voltage out-of-limit problem at present, engineering is answered
The measures such as generator output adjustment, switching capacitive reactance are crossed with multi-pass to be resolved.The present invention is directed to from network topology structure,
Dynamic partitioning techniques are introduced, the dynamic partition Adjusted Option for coordinating the targets such as safety, economy are provided, to solve equipment mistake
The unitary class state of emergency such as load, voltage out-of-limit safeguards the stable operation of power grid.
Summary of the invention
Object of the present invention is to: a kind of bulk power grid emergency state control aid decision-making method based on dynamic partition is provided, with
When realizing that the problems such as voltage out-of-limit, apparatus overload occurs in power grid under current state or forecast failure, start dynamic partition in time
Aid decision calculates, and provides correct control strategy suggestion for dispatcher.
Specifically, the present invention adopts the following technical solutions realize, comprising the following steps:
1) it according to power system operation mode and corresponding model and parameter, is calculated online, after obtaining forecast failure
System load flow data, enter step 2)；
2) Voltage security margin is less than setting threshold value ηv,thr1It is less than setting door with Voltage security margin after forecast failure
Threshold value ηv,thr2Bus be added separately to out-of-limit bus collection and bus collection to be controlled, by overload nargin be less than setting threshold value
ηp,thr1It is less than setting threshold value η with overload nargin after forecast failurep,thr2Equipment be added separately to overload prevention device collection and
Apparatus to be controlled collection, wherein out-of-limit bus collection and bus collection to be controlled, which are referred to as bus, investigates collection, overload prevention device collection and apparatus to be controlled collection
It is referred to as equipment and investigates collection；
If out-of-limit bus collection and overload prevention device collection are sky, i.e., under power grid current state, there is no apparatus overloads or voltage to get over
Limit, then terminate this method；Otherwise, 3) emergency state control aid decision of the starting based on dynamic partition is entered step to calculate；
The equipment refers to line and transformer；
The dynamic partition is referred to when bulk power grid enters the state of emergency, by carrying out switching to part route, is changed
Topological structure of electric, the state of emergency is mitigated or eliminated, the solution cyclization including load transfer and electromagnetic looped network；
3) set the dynamic partition scheme switching number of lines, screening can switching route, formed optinal plan space, into step
It is rapid 4)；
If 4) out-of-limit bus collection and the equal non-empty of overload prevention device collection, show under current state power grid occur the multiclass state of emergency and
Apparatus overload and voltage out-of-limit are existed simultaneously, then for each dynamic partition scheme in optinal plan space, calculates its synthesis
Performance indicator Re,i, integrated performance index is greater than setting threshold value Re,i,threScheme add to scheme to be checked and concentrate, into step
It is rapid 5)；
If out-of-limit bus collection is empty and overload prevention device collection non-empty, show that the urgent shape of unitary class occurs for power grid under current state
State, there are apparatus overloads, then for each dynamic partition scheme in optinal plan space, calculate its integrated performance index
ωp,i, integrated performance index is greater than setting threshold value ωp,i,threScheme add to scheme to be checked and concentrate, enter step 5)；
If out-of-limit bus collection non-empty and overload prevention device collection are sky, i.e., the unitary class state of emergency occurs for power grid under current state,
It is out-of-limit that there are busbar voltages, then for each dynamic partition scheme in optinal plan space, calculates its integrated performance index
ωu,i, integrated performance index is greater than setting threshold value ωu,i,threScheme add to scheme to be checked and concentrate, enter step 5)；
Re,i、ωp,iAnd ωu,i, for characterizing i-th kind of dynamic partition scheme to institute under power grid current state or forecast failure
The improvement degree of the specific state of emergency occurred, value is bigger, and effect is better；
If 5) scheme collection non-empty to be checked, for each dynamic partition scheme that scheme to be checked is concentrated, exchange tide is utilized
Bus investigates the Voltage security margin for concentrating each bus after stream calculation dynamic partition scheme is implemented and equipment is investigated and concentrates each equipment
Overload nargin should if the overload nargin of the Voltage security margin of each bus and equipment is all larger than setting threshold value
Scheme is added feasible program and concentrates；It enters step 6)；
If scheme collection to be checked is sky, judge whether switching route number has reached the upper limit, if the not up to upper limit, increases
Route switching item number, redefines optinal plan space, enters step 3)；If switching route number has reached the upper limit, terminate
This method；
If 6) feasible program collection non-empty, for multiple dynamic partition schemes that feasible program is concentrated, it is based on dynamic partition
Quantitatively evaluating index system carries out overall merit, selects optimum control scheme, terminates this method；If feasible program collection is sky,
Each scheme that scheme to be checked is concentrated is ranked up by the size of integrated performance index, takes integrated performance index maximum dynamic
State partition scheme terminates this method as last control program.
Above-mentioned technical proposal is further characterized by, and in the step 2), calculates bus according to formula (1)~(2)
Voltage security margin:
In formula: ηv,iFor the Voltage security margin of bus i；UiFor the voltage magnitude of bus i；WithRespectively its upper limit
And lower limit；
The equipment includes line and transformer, and the overload of route and transformer is calculated separately according to formula (3) and (4)
Safety margin:
In formula: ηpl,iFor the overload nargin of route i；IliFor the current value of route i；Ili.limFor the thermostabilization of route i
Limit value；
In formula: ηpt,iFor the overload nargin of transformer i；StiFor the apparent energy of transformer i；Sti.limFor transformer i
Rated capacity.
Above-mentioned technical proposal is further characterized by, in the step 3), according to the optinal plan of switching route formation
Space, need to follow following principle: switching is 220kV route；The route of investment is in the line for stopping transport and overhauling end state
Road；Folding scheme need to guarantee power supply reliability, it is ensured that not will form isolated network；It needs that switching route is arranged according to power grid actual conditions
The upper limit.
Above-mentioned technical proposal is further characterized by, and in the step 4), calculates R according to formula (5)e,i:
In formula: Re,iFor the integrated performance index of i-th kind of dynamic partition scheme for voltage out-of-limit and apparatus overload；I=
1,2 ..., I, I are that equipment investigates the number of devices concentrated, j=1,2 ..., J, and J is that bus investigates the bus number concentrated, η 'p,iWith
η′v,jApparatus overload safety margin and busbar voltage safety margin respectively after the implementation of dynamic partition scheme, kpvFor overload
Conversion coefficient between nargin and Voltage security margin shows the attention degree different with voltage out-of-limit to apparatus overload；In phase
Answer equipment be route when ηp,iEqual to ηpl,i, the η when relevant device is transformerp,iEqual to ηpt,i；
ω is calculated according to formula (6)u,i:
In formula: ωu,iFor the integrated performance index of i-th kind of dynamic partition scheme for voltage out-of-limit；V is bus investigation
Collection, including out-of-limit bus collection and bus collection to be controlled；γvFor the importance modifying factor of different voltages grade bus；N is current shape
The bus number of voltage out-of-limit, λ under statei,j,vFor the Voltage security margin of wherein j-th of bus；Si,j,vTo implement i-th kind of dynamic
The Voltage security margin variable quantity of j-th of bus after partition scheme；W is the sum of forecast failure, NkFor under wherein k-th of failure
The bus number of voltage out-of-limit, λ occursi,l,k,vFor the Voltage security margin of first of bus under k-th of failure；Si,l,k,vIt is i-th
Plant the variable quantity of the Voltage security margin of first of bus under k-th of failure after dynamic partition scheme is implemented；
ω is calculated according to formula (7)p,i:
In formula: ωp,iFor the integrated performance index of i-th kind of dynamic partition scheme for apparatus overload；V is equipment investigation
Collection, that is, the equipment intersection overloaded；γvFor the importance modifying factor of different voltages grade equipment；N is to overload under current state
Equipment number, θi,j,vFor the overload nargin of wherein j-th of equipment；μi,j,vTo implement jth after i-th kind of dynamic partition scheme
The variable quantity of the overload nargin of a equipment；W is the sum of forecast failure, NkWherein overloaded under k-th of failure
Equipment number, θi,l,k,vFor the overload nargin of first of equipment under k-th of failure；μi,l,k,vFor i-th kind of dynamic partition scheme
After implementation under k-th of failure the overload nargin of first of equipment variable quantity.
Above-mentioned technical proposal is further characterized by, and in the step 6), is based on dynamic partition quantitatively evaluating index body
It is that overall merit is carried out to the dynamic partition scheme that feasible program is concentrated, carries out in the following manner:
For each scheme, it is first determined the weight of its index at different levels, and then obtained by certain mathematical algorithms
The comprehensive evaluation index of upper level index successively calculates upwards, finally obtains the comprehensive evaluation result of dynamic partition scheme；Dynamically
Zonal quantization assessment indicator system includes safety, reliability and economy three classes index, as follows:
The first kind, safety indexes:
Line load index xL
In formula: i=1,2 ..., nl；ηpl,iFor the overload nargin of route i；nlFor the number of lines；αliIt is important for route
Property modifying factor；
Transformer load index xT
In formula: i=1,2 ..., nt；ηpt,iFor the overload nargin of transformer i；ntFor transformer number；αtiFor transformation
Device importance modifying factor；
Voltage level index λU
In formula: i=1,2 ..., nu；nuFor bus quantity；ηv,iFor the Voltage security margin of bus i；αuiFor busbar voltage
Importance modifying factor；
Short circuit current level index xI
In formula: i=1,2 ..., nsc；nscFor short trouble number；Ii,scFor the short-circuit current value under i-th of short trouble；
Ii,sc.limFor the minimum value of the rupturing capacity of the connected breaker of short-circuit busbar；
Second class, reliability index:
Current supply circuit number SM
In formula: SiFor be not more than two supplying channels the end 220kV substation capacity；
Spinning reserve index xre
In formula: PSRFor active spinning reserve capacity；PSR.limFor the minimum limit value of active spinning reserve capacity；
Third class, economic index:
System losses index Sloss
Sloss=∑ PG-∑PD (14)
In formula: PGFor the capacity that generates electricity；PDFor load capacity；
Operate cost index Fc
In formula: n is the number of route folding；fiFor the operating cost for opening and closing generation every time, cost and use with switch
Service life is related.
Beneficial effects of the present invention are as follows: the present invention has fully considered that power grid may under power grid current state and forecast failure
The voltage out-of-limit and apparatus overload problem of appearance, relate to Corrective control and prevention and control.In addition, the dynamic that the present invention is based on
Partitioning technique (including falling the solution cyclization of load, electromagnetic looped network), using route switching as core, the topology of dynamic adjustment operation rack
Structure, speed is fast and control cost is small.Finally, the present invention is according to dynamic partition quantitatively evaluating index system to feasible dynamic point
Area's control program preferentially, comprehensively consider influence of each scheme to electric network security, economy and reliability, select optimal
Control program.
Detailed description of the invention
Fig. 1 is flow diagram of the invention.
Fig. 2 is the quantitatively evaluating index system of dynamic partition scheme.
Specific embodiment
Below with reference to embodiment and referring to attached drawing, present invention is further described in detail.
Embodiment 1:
One embodiment of the present of invention, step is as shown in Figure 1:
Step 1 describes in Fig. 1, according to power system operation mode and corresponding model and parameter, is counted online
It calculates, 2) the system load flow data after obtaining forecast failure enter step；
Step 2 describes in Fig. 1,2) Voltage security margin is less than setting threshold value ηv,thr1With electricity after forecast failure
Safety margin is pressed to be less than setting threshold value ηv,thr2Bus be added separately to out-of-limit bus collection, bus collection to be controlled, by overload
Nargin is less than setting threshold value ηp,thr1It is less than setting threshold value η with overload nargin after forecast failurep,thr2Equipment difference
It is added to overload prevention device collection, apparatus to be controlled collection, wherein out-of-limit bus collection and bus collection to be controlled, which are referred to as bus, investigates collection, overload is set
Standby collection and apparatus to be controlled collection are referred to as equipment and investigate collection；
If out-of-limit bus collection and overload prevention device collection are sky, i.e., under power grid current state, there is no apparatus overloads or voltage to get over
Limit, then terminate to settle accounts；Otherwise, emergency state control aid decision of the starting based on dynamic partition calculates, and enters step 3)；
The equipment refers to line and transformer.
The dynamic partition is referred to when bulk power grid enters the state of emergency, by carrying out switching to part route, is changed
Topological structure of electric, the technology of the state of emergency is mitigated or eliminated.Dynamic partitioning techniques specifically include two kinds, first is that load turns
For second is that the solution cyclization of electromagnetic looped network.
Busbar voltage safety margin, the calculation method of apparatus overload safety margin of the power grid are as follows:
The state of emergency that the present invention considers include two aspect: one is to voltage out-of-limit, apparatus overload under current state；Two
It is voltage out-of-limit and apparatus overload occur after forecast failure, relates separately to Corrective control and the prevention and control of power grid.According to formula
(1)~(2) Voltage security margin of bus is calculated.
In formula: ηv,iFor the Voltage security margin of bus i；UiFor the voltage magnitude of bus i；WithRespectively its upper limit
And lower limit.
The overload nargin of route and transformer is calculated separately according to formula (3) and (4).
In formula: ηpl,iThe overload nargin of route i；IliFor the current value of route i；Ili.limIt is limited for the thermostabilization of route i
Value.
In formula: ηpt,iFor the overload nargin of transformer i；StiFor the apparent energy of transformer i；Sti.limFor transformer i
Rated capacity.
Step 3 describes in Fig. 1, set the dynamic partition scheme switching number of lines, screening can switching route, formation can
Solution space is selected, is entered step 4)；
The formulation for being formed by optinal plan space by switching route need to follow following principle:
(1) route of switching is 220kV route；
(2) route put into is in the route for stopping transport and overhauling end state；
(3) folding scheme need to guarantee power supply reliability, it is ensured that not will form isolated network；
(4) the power grid state of emergency possibly can not be fully solved in view of only relying on dynamic partition scheme, and such as switching simultaneously
Route number it is excessive, can not only increase calculation amount, and be difficult to operate in actual schedule operation, it is therefore desirable to according to power grid reality
The upper limit of situation setting switching route；
General initial switching route number is set as 1, incremented by successively on this basis.
Step 4 describes in Fig. 1, if out-of-limit bus collection and the equal non-empty of overload prevention device collection, i.e., power grid is same under current state
When there are apparatus overloads and voltage out-of-limit, then for each dynamic partition scheme in optinal plan space, it is comprehensive to calculate its
It can index Re,i, integrated performance index is greater than setting threshold value Re,i,threScheme add to scheme to be checked and concentrate, enter step
5)；If out-of-limit bus collection is sky, overload prevention device collection non-empty, i.e., apparatus overload is had occurred in power grid under current state, then for optional
Each dynamic partition scheme in solution space, calculates its integrated performance index ωp,i, integrated performance index is greater than setting door
Threshold value ωp,i,threScheme add to scheme to be checked and concentrate, enter step 5)；If out-of-limit bus collection non-empty, overload prevention device collection are
Sky, i.e., each dynamic partition scheme that busbar voltage is out-of-limit, then is directed in optinal plan space has occurred in power grid under current state,
Calculate its integrated performance index ωu,i, integrated performance index is greater than setting threshold value ωu,i,threScheme add to side to be checked
Case is concentrated, and is entered step 5)；
Integrated performance index (the Re、ωu,iAnd ωp,i) i-th kind of dynamic partition scheme is characterized to current state or anticipation
The improvement degree of the specific state of emergency occurred under failure, value is bigger, and effect is better.
The multiclass state of emergency occurs for power grid, i.e., when power grid voltage out-of-limit and apparatus overload occurs simultaneously, is counted according to formula (5)
A set of dynamic partition scheme is calculated to the effect for improving the multiclass state of emergency.
In formula: Re,iFor the integrated performance index of i-th kind of dynamic partition scheme of voltage out-of-limit and apparatus overload；I=1,
2 ..., I, I are that equipment investigates the number of devices concentrated, j=1,2 ..., J, and J is that bus investigates the bus number concentrated, η 'p,iWith η 'v,j
Apparatus overload safety margin and busbar voltage safety margin respectively after the implementation of dynamic partition scheme, kpvFor overload nargin
Conversion coefficient between Voltage security margin shows that the attention degree different with voltage out-of-limit to apparatus overload (generally takes 0.5
Between~1.5).The η when relevant device is routep,iEqual to ηpl,i, the η when relevant device is transformerp,iEqual to ηpt,i。
The unitary class state of emergency occurs for power grid, i.e., when voltage out-of-limit or apparatus overload occurs in power grid, respectively according to formula
(6), formula (7) calculates dynamic partition scheme to the improvement of the state of emergency.
In formula: ωu,iFor the integrated performance index of i-th kind of dynamic partition scheme for voltage out-of-limit；V is bus investigation
Collection, including out-of-limit bus collection and bus collection to be controlled；γvFor the importance modifying factor of different voltages grade bus；N is current shape
The bus number of voltage out-of-limit, λ under statei,j,vFor the Voltage security margin of wherein j-th of bus；Si,j,vTo implement i-th kind of dynamic
The Voltage security margin variable quantity of j-th of bus after partition scheme；W is the sum of forecast failure, NkFor under wherein k-th of failure
The bus number of voltage out-of-limit, λ occursi,l,k,vFor the Voltage security margin of first of bus under k-th of failure；Si,l,k,vIt is i-th
Plant the variable quantity of the Voltage security margin of first of bus under k-th of failure after dynamic partition scheme is implemented.
In formula: ωp,iFor the integrated performance index of i-th kind of dynamic partition scheme for apparatus overload；V is equipment investigation
Collection, that is, equipment (route/transformer) intersection overloaded；γvFor the importance modifying factor of different voltages grade equipment；N is to work as
The equipment number overloaded under preceding state, θi,j,vFor the overload nargin of wherein j-th of equipment；μi,j,vTo implement i-th kind of dynamic
The variable quantity of the overload nargin of j-th of equipment after partition scheme；W is the sum of forecast failure, NkFor wherein k-th event
The lower equipment number overloaded of barrier, θi,l,k,vFor the overload nargin of first of equipment under k-th of failure；μi,l,k,vIt is i-th
Plant the variable quantity of the overload nargin of first of equipment under k-th of failure after dynamic partition scheme is implemented.
Step 5 describes in Fig. 1, if scheme collection non-empty to be checked, divides for each dynamic that scheme to be checked is concentrated
Area scheme calculates bus investigation after dynamic partition scheme is implemented using AC power flow and concentrates the Voltage security margin of each bus and set
The overload nargin for concentrating each equipment is examined in appendix, if the overload nargin of the Voltage security margin of each bus and equipment is all larger than and sets
The program is then added feasible program and concentrated by set threshold value.It enters step 6).
If scheme collection to be checked is sky, judge whether switching route number has reached the upper limit, if the not up to upper limit, increases
Route switching item number, redefines optinal plan space, enters step 3)；If switching route number has reached the upper limit, terminate
It calculates；
Step 6 describes in Fig. 1, if feasible program collection non-empty, for the multiple dynamics point concentrated to feasible program
Area scheme is based on dynamic partition quantitatively evaluating index system, carries out overall merit, selects optimum control scheme, terminates to calculate；If
Feasible program collection is sky, then is ranked up each scheme that scheme to be checked is concentrated by the size of integrated performance index, takes comprehensive
The maximum dynamic partition scheme of performance indicator is closed as last control program, terminates to calculate.
The method that the dynamic partition scheme concentrated to feasible program carries out overall merit is as follows:
Based on dynamic partition quantitatively evaluating index system, for each scheme, it is first determined the weight of its index at different levels, into
And the comprehensive evaluation index of upper level index is obtained by certain mathematical algorithms, it successively calculates, finally obtains dynamic upwards
The comprehensive evaluation result of state partition scheme.
Dynamic partition quantitatively evaluating index system includes safety, reliability and economy three classes index, as shown in Fig. 2,
Specific targets are as follows:
The first kind, safety indexes:
(1) line load index xL
In formula: i=1,2 ..., nl；ηpl,iFor the overload nargin of route i；nlFor the number of lines；αliIt is important for route
Property modifying factor.
(2) transformer load index xT
In formula: i=1,2 ..., nt；ηpl,iFor the overload nargin of transformer i；ntFor transformer number；αtiFor transformation
Device importance modifying factor.
(3) voltage level index λU
In formula: i=1,2 ..., nu；nuFor bus quantity；ηv,iFor the Voltage security margin of bus i；αuiFor busbar voltage
Importance modifying factor.
(4) short circuit current level index xI
In formula: i=1,2 ..., nsc；nscFor short trouble number；Ii,scFor the short-circuit current value under i-th of short trouble.
Ii,sc.limFor the minimum value of the rupturing capacity of the connected breaker of short-circuit busbar.
Second class, reliability index:
(1) current supply circuit number SM
In formula: SiFor be not more than two supplying channels the end 220kV substation capacity.
(2) spinning reserve index xre
In formula: PSRFor active spinning reserve capacity；PSR.limFor the minimum limit value of active spinning reserve capacity.
" national grid safety and stability computing technique specification " is pointed out generally to determine by the actual load no more than 2%~5%
Active spinning reserve.Therefore, PSR.limThe 2% of desirable system peak load.
Third class, economic index:
(1) system losses index Sloss
Sloss=∑ PG-ΣPDFormula (14)
In formula: PGFor the capacity that generates electricity；PDFor load capacity.
(2) cost index F is operatedc
In formula: n is the number of route folding；fiFor the operating cost for opening and closing generation every time, cost and use with switch
Service life is related.
The determination of the weight of index is the core of comprehensive evaluation algorithm, generally there is subjective weighting method, objective weighted model and comprehensive
Close enabling legislation.The present embodiment determines the weight of indexs at different levels using the analytic hierarchy process (AHP) for being under the jurisdiction of subjective weighting method.
In view of the index that the carried state zonal quantization assessment indicator system of the present invention is included is type index less than normal, i.e.,
Index evaluation value is lower, and Criterion Attribute is better, is assigned temporary to single evaluation index, should be assigned to even more important index
Lower weight.
After weight determines, the comprehensive evaluation index of every grade of index can be determined by operation methods such as fuzzy mathematicses.This reality
It applies the method that example is considered as linear weighted function and obtains comprehensive evaluation result, can be denoted as:
In formula:For the weight of each index set；βjFor the weight of index single in each index set；xjFor the list in index set
A index；N is each index set middle finger target number.
In conclusion trap queuing can be carried out to multiple dynamic partition schemes according to the size of comprehensive evaluation result, it is comprehensive
Its smaller feasibility of evaluation result is better.
Although the present invention has been described by way of example and in terms of the preferred embodiments, embodiment is not for the purpose of limiting the invention.Not
It is detached from the spirit and scope of the present invention, any equivalent change or retouch done also belongs to the protection scope of the present invention.Cause
This protection scope of the present invention should be based on the content defined in the claims of this application.
Claims (5)
1. a kind of bulk power grid emergency state control aid decision-making method based on dynamic partition, which is characterized in that including following step
It is rapid:
1) it according to power system operation mode and corresponding model and parameter, is calculated online, after obtaining forecast failure is
2) system flow data, enters step；
2) Voltage security margin is less than setting threshold value ηv,thr1It is less than setting threshold value with Voltage security margin after forecast failure
ηv,thr2Bus be added separately to out-of-limit bus collection and bus collection to be controlled, by overload nargin be less than setting threshold value ηp,thr1
It is less than setting threshold value η with overload nargin after forecast failurep,thr2Equipment be added separately to overload prevention device collection and to be controlled set
Standby collection, wherein out-of-limit bus collection and bus collection to be controlled, which are referred to as bus, investigates collection, overload prevention device collection and apparatus to be controlled collection are referred to as
Equipment investigates collection；
If out-of-limit bus collection and overload prevention device collection are sky, i.e., apparatus overload or voltage out-of-limit are not present under power grid current state,
Then terminate this method；Otherwise, 3) emergency state control aid decision of the starting based on dynamic partition is entered step to calculate；
The equipment refers to line and transformer；
The dynamic partition is referred to when bulk power grid enters the state of emergency, by carrying out switching to part route, changes power grid
Topological structure, the state of emergency is mitigated or eliminated, the solution cyclization including load transfer and electromagnetic looped network；
3) set the dynamic partition scheme switching number of lines, screening can switching route, formed optinal plan space, enter step
4)；
If 4) out-of-limit bus collection and the equal non-empty of overload prevention device collection, show under current state that the multiclass state of emergency and simultaneously occurs for power grid
There are apparatus overloads and voltage out-of-limit, then for each dynamic partition scheme in optinal plan space, calculate its comprehensive performance
Index Re,i, integrated performance index is greater than setting threshold value Re,i,threScheme add to scheme to be checked and concentrate, enter step
5)；
If out-of-limit bus collection is empty and overload prevention device collection non-empty, show that the unitary class state of emergency occurs for power grid under current state, deposits
In apparatus overload, then for each dynamic partition scheme in optinal plan space, its integrated performance index ω is calculatedp,i, will be comprehensive
It closes performance indicator and is greater than setting threshold value ωp,i,threScheme add to scheme to be checked and concentrate, enter step 5)；
If out-of-limit bus collection non-empty and overload prevention device collection are sky, i.e., the unitary class state of emergency occurs for power grid under current state, exists
Busbar voltage is out-of-limit, then for each dynamic partition scheme in optinal plan space, calculates its integrated performance index ωu,i, will
Integrated performance index is greater than setting threshold value ωu,i,threScheme add to scheme to be checked and concentrate, enter step 5)；
Re,i、ωp,iAnd ωu,i, for characterizing, i-th kind of dynamic partition scheme is lower to power grid current state or forecast failure to be occurred
The specific state of emergency improvement degree, value is bigger, and effect is better；
If 5) scheme collection non-empty to be checked, for each dynamic partition scheme that scheme to be checked is concentrated, AC power flow meter is utilized
Calculating bus investigation after dynamic partition scheme is implemented concentrates the Voltage security margin of each bus and equipment to investigate the mistake for concentrating each equipment
Safety margin is carried, if the overload nargin of the Voltage security margin of each bus and equipment is all larger than setting threshold value, by the program
Feasible program is added to concentrate；It enters step 6)；
If scheme collection to be checked is sky, judge whether switching route number has reached the upper limit, if the not up to upper limit, increases route
Switching item number, redefines optinal plan space, enters step 3)；If switching route number has reached the upper limit, terminate we
Method；
If 6) feasible program collection non-empty, for multiple dynamic partition schemes that feasible program is concentrated, quantified based on dynamic partition
Assessment indicator system carries out overall merit, selects optimum control scheme, terminates this method；It, will be to if feasible program collection is sky
Each scheme that check scheme is concentrated is ranked up by the size of integrated performance index, takes the maximum dynamic of integrated performance index point
Area scheme terminates this method as last control program.
2. the bulk power grid emergency state control aid decision-making method according to claim 1 based on dynamic partition, feature
It is, in the step 2), the Voltage security margin of bus is calculated according to formula (1)~(2):
In formula: ηv,iFor the Voltage security margin of bus i；UiFor the voltage magnitude of bus i；WithRespectively its upper limit is under
Limit；
The equipment includes line and transformer, is pacified according to the overload that formula (3) and (4) calculate separately route and transformer
Full nargin:
In formula: ηpl,iFor the overload nargin of route i；IliFor the current value of route i；Ili.limIt is limited for the thermostabilization of route i
Value；
In formula: ηpt,iFor the overload nargin of transformer i；StiFor the apparent energy of transformer i；Sti.limFor the volume of transformer i
Constant volume.
3. the bulk power grid emergency state control aid decision-making method according to claim 1 based on dynamic partition, feature
It is, in the step 3), according to the optinal plan space that switching route is formed, need to follow following principle: switching is 220kV
Route；The route of investment is in the route for stopping transport and overhauling end state；Folding scheme need to guarantee power supply reliability, it is ensured that no
It will form isolated network；Need to be arranged according to power grid actual conditions the upper limit of switching route.
4. the bulk power grid emergency state control aid decision-making method according to claim 1 based on dynamic partition, feature
It is, in the step 4), calculates R according to formula (5)e,i:
In formula: Re,iFor the integrated performance index of i-th kind of dynamic partition scheme for voltage out-of-limit and apparatus overload；I=1,
2 ..., I, I are that equipment investigates the number of devices concentrated, j=1,2 ..., J, and J is that bus investigates the bus number concentrated, η 'p,iWith η 'v,j
Apparatus overload safety margin and busbar voltage safety margin respectively after the implementation of dynamic partition scheme, kpvFor overload nargin
Conversion coefficient between Voltage security margin shows the attention degree different with voltage out-of-limit to apparatus overload；Accordingly setting
For η when being routep,iEqual to ηpl,i, the η when relevant device is transformerp,iEqual to ηpt,i；
ω is calculated according to formula (6)u,i:
In formula: ωu,iFor the integrated performance index of i-th kind of dynamic partition scheme for voltage out-of-limit；V is that bus investigates collection, packet
Include out-of-limit bus collection and bus collection to be controlled；γvFor the importance modifying factor of different voltages grade bus；N is under current state
The bus number of voltage out-of-limit, λi,j,vFor the Voltage security margin of wherein j-th of bus；Si,j,vTo implement i-th kind of dynamic partition
The Voltage security margin variable quantity of j-th of bus after scheme；W is the sum of forecast failure, NkTo occur under wherein k-th of failure
The bus number of voltage out-of-limit, λi,l,k,vFor the Voltage security margin of first of bus under k-th of failure；Si,l,k,vIt is dynamic for i-th kind
State partition scheme implement after under k-th of failure the Voltage security margin of first of bus variable quantity；
ω is calculated according to formula (7)p,i:
In formula: ωp,iFor the integrated performance index of i-th kind of dynamic partition scheme for apparatus overload；V is that equipment investigates collection, i.e.,
The equipment intersection of overload；γvFor the importance modifying factor of different voltages grade equipment；N is the equipment overloaded under current state
Number, θi,j,vFor the overload nargin of wherein j-th of equipment；μi,j,vTo implement to set for j-th after i-th kind of dynamic partition scheme
The variable quantity of standby overload nargin；W is the sum of forecast failure, NkFor the equipment overloaded under wherein k-th of failure
Number, θi,l,k,vFor the overload nargin of first of equipment under k-th of failure；μi,l,k,vImplement for i-th kind of dynamic partition scheme
Afterwards under k-th of failure the overload nargin of first of equipment variable quantity.
5. the bulk power grid emergency state control aid decision-making method according to claim 1 based on dynamic partition, feature
Be, in the step 6), feasible program is concentrated based on dynamic partition quantitatively evaluating index system dynamic partition scheme into
Row overall merit carries out in the following manner:
For each scheme, it is first determined the weight of its index at different levels, and then upper one is obtained by certain mathematical algorithms
The comprehensive evaluation index of grade index, successively calculates upwards, finally obtains the comprehensive evaluation result of dynamic partition scheme；Dynamic partition
Quantitatively evaluating index system includes safety, reliability and economy three classes index, as follows:
The first kind, safety indexes:
Line load index xL
In formula: i=1,2 ..., nl；ηpl,iFor the overload nargin of route i；nlFor the number of lines；αliIt is repaired for route importance
Positive divisor；
Transformer load index xT
In formula: i=1,2 ..., nt；ηpt,iFor the overload nargin of transformer i；ntFor transformer number；αtiThink highly of for transformation
The property wanted modifying factor；
Voltage level index λU
In formula: i=1,2 ..., nu；nuFor bus quantity；ηv,iFor the Voltage security margin of bus i；αuiFor busbar voltage importance
Modifying factor；
Short circuit current level index xI
In formula: i=1,2 ..., nsc；nscFor short trouble number；Ii,scFor the short-circuit current value under i-th of short trouble；
Ii,sc.limFor the minimum value of the rupturing capacity of the connected breaker of short-circuit busbar；
Second class, reliability index:
Current supply circuit number SM
In formula: SiThe capacity of the end the 220kV substation of two supplying channels is not more than for i-th, R represents all not more than two
The sum of the end the 220kV substation of a supplying channels；
Spinning reserve index xre
In formula: PSRFor active spinning reserve capacity；PSR.limFor the minimum limit value of active spinning reserve capacity；
Third class, economic index:
System losses index Sloss
Sloss=∑ PG-∑PD (13)
In formula: PGFor the capacity that generates electricity；PDFor load capacity；
Operate cost index Fc
In formula: n is the number of route folding；fiFor the operating cost for opening and closing generation every time, have with the cost and service life of switch
It closes.
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