CN106451475A - Searching method for generator tripping value and generator tripping range - Google Patents
Searching method for generator tripping value and generator tripping range Download PDFInfo
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- CN106451475A CN106451475A CN201611092304.0A CN201611092304A CN106451475A CN 106451475 A CN106451475 A CN 106451475A CN 201611092304 A CN201611092304 A CN 201611092304A CN 106451475 A CN106451475 A CN 106451475A
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- power system
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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
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/14—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by switching loads on to, or off from, network, e.g. progressively balanced loading
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
- Y02B70/3225—Demand response systems, e.g. load shedding, peak shaving
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
- Y04S20/222—Demand response systems, e.g. load shedding, peak shaving
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention discloses a searching method for generator tripping value and generator tripping range which determines a cut generator rejection, according to a preset value CO of the generator tripping. After the cut generator rejection is cut, whether an electrical power system is stable or not is estimated. If the electrical power system is in an instability, the preset value CO of the generator tripping is increased to a searching step Delta CO. Whether the preset value CO of the generator tripping is less than a maximum output and C max or not is estimated. If the preset value CO of the generator tripping is less than the maximum and C max, a cut generator rejection is redetermined and a stability of system is estimated according to the changed preset value CO of the generator tripping. Until the electrical power system is in a stability, the preset value CO of the generator tripping is a pending generator tripping value C. When the preset value CO of the generator tripping is assigned to the generator tripping value C, a search for the generator tripping value C is finished. Base on an obtainment of the generator tripping value C, a dichotomy is used to search a range of the generator tripping. The invention relates to the searching method for generator tripping value and generator tripping range which can search the generator tripping value and the generator tripping range quickly, therefore a safe and stable strategy can be made quickly and simply.
Description
Technical field
The present invention relates to Power System Analysis technical field, more particularly to one kind are cut machine amount and cut machine range searching side
Method.
Background technology
Power system is a complicated big system, and operation of power networks needs to keep the safety and stability of electrical network.According to《Power train
System safety and stability directive/guide》, power system follows in N-1 principle, i.e. power system any element (as circuit, unit, transformator
Deng) fault-free or for some reason barrier disconnect, power system should be able to keep stable operation and normal power supply.
Therefore, if a certain element that power system occurs in N-1 fault, i.e. power system disconnects, then power system need not
Any measure is taken, system can keep stable.But, if there are two elements in N-2 fault, i.e. power system in power system
Simultaneously switch off, then power system will occur unstability, to recover stablizing for power system, excision need to be taken to send out unit (letter below
Claim to cut machine), cut off the load measure such as (hereinafter referred to as cutting load).
At present, power system is provided with safety stabilization control system, is provided with the peace for pre-establishing in safety stabilization control system
Full stable strategy, there is N-2 event in safety and stability strategy in the case of no overhauling, overhaul for the different typical operation modes that manpower is calculated
That need to taken during barrier cuts the measures such as machine, cutting load.When there is the N-2 fault of certain quasi-representative in power system, security and stability control
System sends the instruction such as the machine of cutting, cutting load according to safety and stability strategy set in advance, completes to cut the operation such as machine, cutting load, from
And maintain the stability of power system.
The calculating process for cutting the measures such as machine, cutting load includes cutting machine capacity (lower file claims to cut machine amount) and cutting load capacity
The calculating of (hereinafter referred cutting load amount).Cutting load is primarily directed to circuit on power system, transformer overload, therefore, general root
Just can better simply determination cutting load amount according to overload degree.But, angle stability of the machine mainly for power system is cut, therefore,
Cannot be determined by simple method and machine amount is cut, in prior art, machine amount be cut by artificial calculating.Power system scale now
Huge, element is numerous, and power system has multiple units, by sound out method find out its corresponding cut machine amount, therefore, cut machine
The calculating process of amount is an extremely loaded down with trivial details, complicated process, needs to put into substantial amounts of manpower and time.
Content of the invention
Machine amount is cut there is provided one kind in the embodiment of the present invention and machine range searching method is cut, to solve people of the prior art
Power is calculated cuts that machine amount is time-consuming, the problem of effort.
In order to solve above-mentioned technical problem, the embodiment of the invention discloses following technical scheme：
One kind cuts machine amount searching method, it is adaptable in the safety and stability strategy of power system, including,
S11, according to cutting machine preset value C0, determine and unit is cut, wherein, the unit of being cut includes several units, described
Sum C of exerting oneself of several unitsaddWith cut machine predetermined amount C0Match；
S12, judges that excision is described and is cut after unit, whether power system reaches stable；
S121, if power system is not up to stable, cuts machine predetermined amount C by described0Increase a default unstability search
Step delta C0, i.e. C0=C0+ΔC0, and judge to cut machine predetermined amount C0Whether less than EIAJ and Cmax, i.e. C0≤Cmax, wherein,
The EIAJ and CmaxSum of exerting oneself for all units；If cutting machine predetermined amount C0Less than EIAJ and Cmax, then return
Step S11；
S122, if power system reach stable, now cut machine predetermined amount C0Machine amount C is as cut, machine predetermined amount C will be cut0
Numerical value be assigned to cut machine amount C, complete to cut the search of machine amount C.
Preferably, also include before step S11, S10, set and cut machine predetermined amount C0Numerical value.
Preferably, the judgement excision is described is cut after unit, and it is stable whether power system reaches, and cuts off institute including obtaining
The Temporal Data for being cut power system after unit is stated, the Temporal Data includes generator rotor angle, voltage, damping and overload numerical value；Successively
Judge whether each Temporal Data reaches default stability criterion, if default stability criterion is all reached, judge power system
Reach stable state；If there is any one Transient Stability Criterion default stability criterion is not up to, judge that power system is not up to
Stable state.
One kind cuts machine range searching method, cuts machine amount C according to the method search in any one in claim 1-3,
Acquisition cuts machine amount scope described in searching on the basis of cutting machine amount C, including S21, cuts machine upper limit C using dichotomizing searchupWith S22,
Machine lower limit C is cut using dichotomizing searchdown.
Preferably, the S21, cuts machine upper limit C using dichotomizing searchupIncluding,
S211, the numerical value for cutting machine amount C is assigned to cut machine pre-determined lower limit C0, down, by the EIAJ and C0, max's
Numerical value is assigned to cut machine preset upper limit C0, up；
S212, according to cutting machine pre-determined lower limit C0, downWith cut machine preset upper limit C0, up, calculate machine amount C to be cutx, the machine to be cut
Amount CxComputing formula be
S213, according to machine amount C to be cutx, determine and unit cut, and judge that excision is cut whether power system after unit is in
Stable；
S2131, if power system is in stable, by machine amount C to be cutxNumerical value be assigned to cut machine pre-determined lower limit C0, down；
S2132, if band is cut machine amount C in unstable by power systemxNumerical value is assigned to cut machine preset upper limit C0, up；
S214, judges to cut machine pre-determined lower limit C0, downWith cut machine preset upper limit C0, upDifference whether more than default stable
Judge step-length CSTEP；
If so, then return to step S212；
If it is not, then now cut machine preset upper limit C0, upMachine upper limit C is as cutup, machine preset upper limit C will be cut0, upNumerical value
It is assigned to cut machine upper limit Cup, complete to cut machine upper limit CupSearch.
Preferably, shown S22, cuts machine lower limit C using dichotomizing searchdownIncluding,
S221, will cut machine pre-determined lower limit C0, downGive 0 to be worth, the numerical value for cutting machine amount C is assigned to cut machine preset upper limit
C0, up；
S222, according to cutting machine pre-determined lower limit C0, downWith cut machine preset upper limit C0, up, calculate machine amount C to be cutx, the machine to be cut
Amount CxComputing formula be
S223, according to machine amount C to be cutx, determining and cut unit, and judges to cut and whether power system is cut after unit in steady
Fixed；
S2231, if power system is in stable, by machine amount C to be cutxNumerical value be assigned to cut machine pre-determined lower limit C0, down；
S2232, if band is cut machine amount C in unstable by power systemxNumerical value is assigned to cut machine preset upper limit C0, up；
S224, judges to cut machine pre-determined lower limit C0, downWith cut machine preset upper limit C0, upDifference whether more than default stable
Judge step-length CSTEP；
If so, then return to step S222；
If it is not, then now cut machine pre-determined lower limit C0, downMachine lower limit C is as cutdown, machine pre-determined lower limit C will be cut0, down's
Numerical value is assigned to cut machine lower limit Cdown, complete to cut machine lower limit CdownSearch.
Beneficial effects of the present invention include：For carry out in safety and stability policy development cutting the search of machine amount need to put into a large amount of
Manpower and time problem, the present invention proposes one kind and cuts machine amount and cut machine range searching method, cut for safety and stability strategy
Formulation, improve cut machine amount search efficiency, reduce human input, save the time.
Description of the drawings
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
Accompanying drawing to be used needed for technology description is had to be briefly described, it should be apparent that, for those of ordinary skill in the art
Speech, on the premise of not paying creative work, other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 is a kind of flow chart for cutting machine amount searching method provided in an embodiment of the present invention；
Fig. 2 is a kind of flow chart for judging stability of power system provided in an embodiment of the present invention；
Fig. 3 is the flow chart for cutting machine amount with machine range searching method is cut provided in an embodiment of the present invention；
Fig. 4 is a kind of flow chart for cutting machine upper limit searching method provided in an embodiment of the present invention；
Fig. 5 is a kind of flow chart for cutting machine lower limit searching method provided in an embodiment of the present invention.
Specific embodiment
In order that those skilled in the art more fully understand the technical scheme in the present invention, below in conjunction with reality of the present invention
The accompanying drawing in example is applied, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described enforcement
Example is only a part of embodiment of the present invention, rather than whole embodiments.Based on the embodiment in the present invention, this area is common
The every other embodiment obtained under the premise of creative work is not made by technical staff, should all belong to present invention protection
Scope.
Fig. 1 is a kind of flow chart for cutting machine amount searching method provided in an embodiment of the present invention, as shown in figure 1, this example is carried
For cut machine amount searching method be applied to power system safety and stability strategy formulation process, it is characterised in that including following
Step：
S11, according to cutting machine preset value C0, determine and unit is cut, wherein, being cut unit includes several units, several units
Sum C of exerting oneselfaddWith cut machine predetermined amount C0Match；
Herein, several units exert oneself be and cut the sum of exerting oneself of unit, should illustrate to be cut unit exerts oneself it
And with cut machine predetermined amount C0Match and refer to, cut exerting oneself sum and cutting machine predetermined amount C for unit0Equal or close.If any quilt
Cut unit exert oneself sum all not with cut machine predetermined amount C0Equal, then according to phase approximately principle of exerting oneself, then select to exert oneself sum and cut
Machine predetermined amount C0Immediate Unit Combination is to be cut unit.
S12, judges to cut off and is cut after unit, and whether power system reaches stable；
Judge to cut off and cut after unit, it is stable whether power system reaches, and specifically includes, obtain to cut off and cut electricity after unit
The Temporal Data of Force system, Temporal Data includes generator rotor angle, voltage, damping and overload numerical value；Judge that each Temporal Data is successively
No reach default stability criterion, if all reaching default stability criterion, judge power system reach stable state；If existing any
One Transient Stability Criterion is not up to default stability criterion, then judge that power system is not up to stable state.
In the present embodiment, the stability state for being cut power system after unit is cut off using Transient State Simulation Software simulation, is read
The Temporal Data of power system, and according to the Temporal Data for reading, judge that power system is not up to stable state.Fig. 2 is reality of the present invention
The flow chart for applying a kind of judgement stability of power system of example offer, as shown in Fig. 2 Temporal Data includes generator rotor angle, voltage, damping
And overload numerical value；Judge whether each Temporal Data reaches default stability criterion successively, specifically, judging power system most
Whether big generator rotor angle is if so, then not up to stable state, if it is not, then reach stable state more than 360 °；Judge the lower voltage node of power system
The voltage low persistent period, whether more than 1 second, is if so, then not up to stable state, if it is not, then reaching stable state；Analytical calculation the system
Transient state curve damping ratio, and judge dominant oscillating mode damping ratio whether less than Dset, if so, then stable state is not up to, if it is not, then
Reach stable state；Judging in power system, whether have element to transship, if so, then stable state being not up to, if it is not, then reaching stable state.
S121, if power system is not up to stable, will cut machine predetermined amount C0Increase a default unstability step-size in search
ΔC0, and judge to cut machine predetermined amount C0Whether less than EIAJ and Cmax, wherein, EIAJ and CmaxUnit is cut for all
Sum of exerting oneself；If cutting machine predetermined amount C0Less than EIAJ and Cmax, then return to step S11；
S122, if power system reach stable, now cut machine predetermined amount C0Machine amount C is as cut, machine predetermined amount C will be cut0
Numerical value be assigned to cut machine amount C, i.e. C=C0, complete to cut the search of machine amount C.
In the present embodiment, also include before step S11, S10, set and cut machine predetermined amount C0Numerical value.Search in actual
During machine amount cut by rope, certain unstability situation cutting machine amount that those skilled in the art can occur to power system carries out one
Preliminary estimation, and estimated value is assigned to cut machine predetermined amount C0.If one can be provided suitably cut machine predetermined amount C0, will shorten
Cut the search time of machine amount C.Certainly, if not cutting machine predetermined amount C0Preset or cut machine predetermined amount C0Situation about estimating is difficult,
Then by automatic cutting machine predetermined amount C0Give 0 to be worth.
Search procedure below with reference to example cutting machine amount C is illustrated, and in power system, AH-JG circuit occurs N-
2 faults, cause electrical network unstability.
The power station unit cut on AH-JG circuit is defined, including AH power station unit and LY power station unit, wherein,
AH power station unit includes 5 units, exerting oneself as 400MW per platform unit；LY power station unit includes 4 units, per platform unit
Exert oneself as 600MW, then EIAJ and CmaxFor 4400MW；
Machine predetermined amount C is cut in setting0Numerical value be 2000MW, unstability step-size in search Δ C0Numerical value be 500MW；
According to cutting machine preset value C0=2000MW, determines 2 units (the referred to as AH 2 for being cut unit for AH power station unit
Platform machine) with 2 units (referred to as 2 machines of LY) of LY power station unit, after actually cutting machine 2000MW unit, through judging, electrical network is still
Unstability is not up to stable；
Machine predetermined amount C will be cut0Increase a unstability step-size in search Δ C0, i.e. C0=2000MW+500MW=2500MW, according to
Determined again cuts machine preset value C0=2500MW, determines and is cut unit for 3 machines of 2 machines of AH and LY, actually cut machine
After 2600MW (capacity phase approximately principle), through judging, electrical network still unstability is not up to stable；
Continue to cut machine predetermined amount C0Increase a unstability step-size in search Δ C0, i.e. C0=2500MW+500MW=3000MW,
Machine preset value C is cut according to redefined0=3000MW, determines and is cut unit for 3 machines of 3 machines of AH and LY, actually cut machine
After 3000MW, through judging, electrical network reaches stable；
Then now cut machine predetermined amount C0Machine amount C is as cut, machine predetermined amount C will be cut0Numerical value be assigned to cut machine amount C, i.e. C=
3000MW, completes to cut the search of machine amount C.
In actual applications, except needing search to cut machine amount, cutting machine scope is also often needed to scan for, i.e. machine is cut in search
The upper limit with cut machine lower limit.Fig. 3 is the flow chart for cutting machine amount with machine range searching method is cut provided in an embodiment of the present invention, such as Fig. 3
Shown, machine amount C is cut by the machine amount searching method determination of cutting that the present embodiment is provided, if when machine amount is cut in search, being made
Electrical network reach stable cut machine amount, then do not carry out cutting the search of machine amount scope, directly terminate search procedure.If obtaining to make electrical network
Reach stable cut machine amount, then cutting machine amount scope is scanned for, and machine amount scope is cut in search includes S21, and machine upper limit C is cut in searchup
With S22, search for and cut machine lower limit Cdown.Complete cutting machine amount and cut after the search procedure of machine scope, cut determined machine amount C, cut
Machine upper limit CupAnd cut machine lower limit CdownExported
It should be noted that the machine amount of cutting is not limited only to obtain using the machine amount searching method of cutting in the present invention, which can also be adopted
He obtains method, such as artificial calculating.
Fig. 4 is a kind of flow chart for cutting machine upper limit searching method provided in an embodiment of the present invention, as shown in figure 4, this enforcement
In example, machine upper limit C is cut using dichotomizing searchup, specifically include,
S211, the numerical value for cutting machine amount C is assigned to cut machine pre-determined lower limit C0, down, i.e. C0, down=C, by EIAJ and Cmax
Numerical value be assigned to cut machine preset upper limit C0, up, i.e. C0, up=Cmax；
S212, according to cutting machine pre-determined lower limit C0, downWith cut machine preset upper limit C0, up, calculate machine amount C to be cutx, machine amount C to be cutx
Computing formula be
S213, according to machine amount C to be cutx, determining and cut unit, and judges to cut and whether power system is cut after unit in steady
Fixed；
S2131, if power system is in stable, by machine amount C to be cutxNumerical value be assigned to cut machine pre-determined lower limit C0, down, i.e.,
C0, down=Cx；
S2132, if band is cut machine amount C in unstable by power systemxNumerical value is assigned to cut machine preset upper limit C0, up, i.e.,
C0, up=Cx；
S214, judges to cut machine pre-determined lower limit C0, downWith cut machine preset upper limit C0, upDifference whether less than default stable
Judge step-length CSTEP, i.e. C0, up-C0, down≤CSTEP；
If it is not, then return to step S212；
If so, then now cut machine preset upper limit C0, upMachine upper limit C is as cutup, machine preset upper limit C will be cut0, upNumerical value
It is assigned to cut machine upper limit Cup, i.e. Cup=C0, up, complete to cut machine upper limit CupSearch.
Process below with reference to the search of the examples detailed above cutting machine upper limit is illustrated, and in the above-described example, has been obtained
Cut machine amount C=3000MW, EIAJ and Cmax=4400MW, meanwhile, set stably and judge step-length CSTEPFor 200MW, search is cut
Machine upper limit detailed process is as follows：
The numerical value for cutting machine amount C is assigned to cut machine pre-determined lower limit C0, down, i.e. C0, down=3000MW；By EIAJ and Cmax
Numerical value be assigned to cut machine preset upper limit C0, up, i.e. C0, up=4400MW；
Calculate machine amount C to be cutx, i.e.,
According to machine amount C to be cutx=3700MW, determines and is cut unit for 4 machines of 3 machines of AH and LY, cut going out for unit
Power sum is 3600MW, and after unit is cut in excision, the stabilization of power grids, then by machine amount C to be cutxNumerical value be assigned to cut machine pre-determined lower limit
C0, down, i.e. C0, down=3700MW；
Judge to cut machine pre-determined lower limit C0, downWith cut machine preset upper limit C0, upDifference whether stable judge step more than default
Long CSTEP, i.e. C0, up-C0, down=4400-3700=700MW ＞ 200MW；
Return and calculate amount C to be cutxStep, cuts machine pre-determined lower limit C according to new settings0, down, recalculate amount C to be cutx,
I.e.
According to machine amount C to be cutx=4050MW, determines and is cut unit for 4 machines of 4 machines of AH and LY, cut going out for unit
Power sum is 4000MW, cuts off and is cut after unit, and the stabilization of power grids, then by machine amount C to be cutxNumerical value be assigned to cut machine pre-determined lower limit
C0, down, i.e. C0, down=4050MW；
Judge to cut machine pre-determined lower limit C0, downWith cut machine preset upper limit C0, upDifference whether stable judge step more than default
Long CSTEP, i.e. C0, up-C0, down=4400-4050=350MW ＞ 200MW；
Return and calculate amount C to be cutxStep, cuts machine pre-determined lower limit C according to new settings0, down, recalculate amount C to be cutx,
I.e.
According to machine amount C to be cutx=4225MW, determines and is cut unit for 4 machines of 5 machines of AH and LY, cut going out for unit
Power sum is 4400MW, cuts off and is cut after unit, and the stabilization of power grids, then by machine amount C to be cutxNumerical value be assigned to cut machine pre-determined lower limit
C0, down, i.e. C0, down=4225MW；
Judge to cut machine pre-determined lower limit C0, downWith cut machine preset upper limit C0, upDifference whether stable judge step more than default
Long CSTEP, i.e. C0, up-C0, down=4400-4225=175MW ＜ 200MW；
Now cut machine preset upper limit C0, upMachine upper limit C is as cutup, machine preset upper limit C will be cut0, upNumerical value be assigned to cut machine
Upper limit Cup, i.e. Cup=4400MW, completes to cut machine upper limit CupSearch.
Fig. 5 is a kind of flow chart for cutting machine lower limit searching method provided in an embodiment of the present invention, as shown in figure 5, this enforcement
In example, machine lower limit C is cut using dichotomizing searchdown, specifically include,
S221, will cut machine pre-determined lower limit C0, downGive 0 to be worth, the numerical value for cutting machine amount C is assigned to cut machine preset upper limit C0, up；
S222, according to cutting machine pre-determined lower limit C0, downWith cut machine preset upper limit C0, up, calculate machine amount C to be cutx, machine amount C to be cutx
Computing formula be
S223, according to machine amount C to be cutx, determining and cut unit, and judges to cut and whether power system is cut after unit in steady
Fixed；
S2231, if power system is in stable, by machine amount C to be cutxNumerical value be assigned to cut machine pre-determined lower limit C0, down；
S2232, if band is cut machine amount C in unstable by power systemxNumerical value is assigned to cut machine preset upper limit C0, up；
S224, judges to cut machine pre-determined lower limit C0, downWith cut machine preset upper limit C0, upDifference whether more than default stable
Judge step-length CSTEP；
If so, then return to step S222；
If it is not, then now cut machine pre-determined lower limit C0, downMachine lower limit C is as cutdown, machine pre-determined lower limit C will be cut0, down's
Numerical value is assigned to cut machine lower limit Cdown, complete to cut machine lower limit CdownSearch.
Process below with reference to the search of examples detailed above cutting machine lower limit is illustrated, and in the above-described example, has been obtained
Machine amount C=3000MW is cut, meanwhile, set stably and judge step-length CSTEPFor 200MW, it is as follows that machine lower limit detailed process is cut in search：
Machine pre-determined lower limit C will be cut0, downGive 0 to be worth, i.e. C0, down=0MW, by the numerical value for cutting machine amount C be assigned to cut machine default on
Limit C0, up, i.e. C0, down=3000MW；
Calculate machine amount C to be cutx, i.e.,
According to machine amount C to be cutx=1500MW, determines and is cut unit for 2 machines of 1 machine of AH and LY, cut going out for unit
Power sum is 1600MW, and after unit is cut in excision, electrical network unstability, then by machine amount C to be cutxNumerical value be assigned to cut machine pre-determined lower limit
C0, down, i.e. C0, down=1500MW；
Judge to cut machine pre-determined lower limit C0, downWith cut machine preset upper limit C0, upDifference whether stable judge step more than default
Long CSTEP, i.e. C0, up-C0, down=3000-1500=1500MW ＞ 200MW；
Return and calculate amount C to be cutxStep, cuts machine pre-determined lower limit C according to new settings0, down, recalculate amount C to be cutx,
I.e.
According to machine amount C to be cutx=2250MW, determines and is cut unit for 2 machines of 3 machines of AH and LY, cut going out for unit
Power sum is 2400MW, cuts off and is cut after unit, and electrical network unstability, then by machine amount C to be cutxNumerical value be assigned to cut machine pre-determined lower limit
C0, down, i.e. C0, down=2250MW；
Judge to cut machine pre-determined lower limit C0, downWith cut machine preset upper limit C0, upDifference whether stable judge step more than default
Long CSTEP, i.e. C0, up-C0, down=3000-2250=750MW ＞ 200MW；
Return and calculate amount C to be cutxStep, cuts machine pre-determined lower limit C according to new settings0, down, recalculate amount C to be cutx,
I.e.
According to machine amount C to be cutx=2625MW, determines and is cut unit for 3 machines of 2 machines of AH and LY, cut going out for unit
Power sum is 2600MW, cuts off and is cut after unit, and electrical network unstability, then by machine amount C to be cutxNumerical value be assigned to cut machine pre-determined lower limit
C0, down, i.e. C0, down=2625MW；
Judge to cut machine pre-determined lower limit C0, downWith cut machine preset upper limit C0, upDifference whether stable judge step more than default
Long CSTEP, i.e. C0, up-C0, down=3000-2625=375MW ＞ 200MW；
Return and calculate amount C to be cutxStep, cuts machine pre-determined lower limit C according to new settings0, down, recalculate amount C to be cutx,
I.e.
According to machine amount C to be cutx=2812.5MW, determines and is cut unit for 2 machines of 4 machines of AH and LY, cut unit
Sum of exerting oneself is 2800MW, cuts off and is cut after unit, and electrical network unstability, then by machine amount C to be cutxNumerical value be assigned to cut machine pre-determined lower limit
C0, down, i.e. C0, down=2800MW；
Judge to cut machine pre-determined lower limit C0, downWith cut machine preset upper limit C0, upDifference whether stable judge step more than default
Long CSTEP, i.e. C0, up-C0, down=3000-2812.5=187.5MW ＜ 200MW；
Now cut machine pre-determined lower limit C0, downMachine lower limit C is as cutdown, machine pre-determined lower limit C will be cut0, downNumerical value be assigned to
Cut machine lower limit Cdown, i.e. Cdown=2800MW, completes to cut machine lower limit CdownSearch.
The present invention can be described in the general context of computer executable instructions, such as program
Module.Usually, program module includes execution particular task or realizes the routine of particular abstract data type, program, object, group
Part, data structure etc..The present invention is put into practice in a distributed computing environment can also, in these distributed computing environment, by
The remote processing devices connected by communication network are executing task.In a distributed computing environment, program module is permissible
It is located at including in the local and remote computer-readable storage medium including storage device.
The above is only the specific embodiment of the present invention, makes skilled artisans appreciate that or realizing this
Bright.Multiple modifications to these embodiments will be apparent to one skilled in the art, as defined herein
General Principle can be realized without departing from the spirit or scope of the present invention in other embodiments.Therefore, the present invention
The embodiments shown herein is not intended to be limited to, and is to fit to and principles disclosed herein and features of novelty phase one
The most wide scope for causing.
The above is only the specific embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, under the premise without departing from the principles of the invention, some improvements and modifications can also be made, these improvements and modifications also should
It is considered as protection scope of the present invention.
In prior art, safety and stability strategy is formulated for artificial, proposes some power system typical case operation sides according to actual
Formula, that need to taken during all kinds of N-2 faults of calculating cuts machine, cutting load measure.
When the security performance of safety and stability strategy is assessed, also need the scope for cutting machine amount is calculated, that is, cut the machine amount upper limit and cut
Machine amount lower limit, has surveyed the wellness of security performance by the ranging assessments safety and stability for cutting machine amount, for example, if cut the machine amount upper limit with
When the difference of lower limit is close with maximum unit capacity, show that the safety of safety and stability strategy is poor.
Claims (6)
1. one kind cuts machine amount searching method, it is adaptable in the safety and stability strategy of power system, it is characterised in that include,
S11, according to cutting machine preset value C0, determine and unit is cut, wherein, the unit of being cut includes several units, the several machines
Sum C of exerting oneself of groupaddWith cut machine predetermined amount C0Match；
S12, judges that excision is described and is cut after unit, whether power system reaches stable；
S1211, if power system is not up to stable, cuts machine predetermined amount C by described0Increase a default unstability step-size in search
ΔC0；
S1212, judges to cut machine predetermined amount C0Whether less than EIAJ and Cmax, wherein, the EIAJ and CmaxFor organic
The sum of exerting oneself of group；If cutting machine predetermined amount C0Less than EIAJ and Cmax, then return to step S11；
S122, if power system reach stable, now cut machine predetermined amount C0Machine amount C is as cut, machine predetermined amount C will be cut0Number
Value is assigned to cut machine amount C, completes to cut the search of machine amount C.
2. according to claim 1 cut machine amount searching method, it is characterised in that also include before step S11, S10, set
Cut machine predetermined amount C0Numerical value.
3. according to claim 1 machine amount searching method is cut, it is characterised in that the judgement cuts off described is cut unit
Afterwards, whether power system reaches and stablizes, and cuts off the Temporal Data for being cut power system after unit, the transient state including obtaining
Data include generator rotor angle, voltage, damping and overload numerical value；Judge whether each Temporal Data reaches default stability criterion successively,
If default stability criterion is all reached, judge that power system reaches stable state；If there is any one Transient Stability Criterion not reaching
To default stability criterion, then judge that power system is not up to stable state.
4. one kind cuts machine range searching method, it is characterised in that cut according to the method search in any one in claim 1-3
Machine amount C, cuts machine amount scope described in search on the basis of machine amount C is cut in acquisition, including S21, cuts the machine upper limit using dichotomizing search
CupWith S22, machine lower limit C is cut using dichotomizing searchdown.
5. according to claim 4 cut machine range searching method, it is characterised in that the S21, cut using dichotomizing search
Machine upper limit CupIncluding,
S211, the numerical value for cutting machine amount C is assigned to cut machine pre-determined lower limit C0, down, by the EIAJ and C0, maxNumerical value
It is assigned to cut machine preset upper limit C0, up；
S212, according to cutting machine pre-determined lower limit C0, downWith cut machine preset upper limit C0, up, calculate machine amount C to be cutx, machine amount C to be cutx
Computing formula be
S213, according to machine amount C to be cutx, determine and unit cut, and judge that excision is cut power system after unit and whether is in and stablize；
S2131, if power system is in stable, by machine amount C to be cutxNumerical value be assigned to cut machine pre-determined lower limit C0, down；
S2132, if band is cut machine amount C in unstable by power systemxNumerical value is assigned to cut machine preset upper limit C0, up；
S214, judges to cut machine pre-determined lower limit C0, downWith cut machine preset upper limit C0, upDifference whether stable judge step more than default
Long CSTEP；
If so, then return to step S212；
If it is not, then now cut machine preset upper limit C0, upMachine upper limit C is as cutup, machine preset upper limit C will be cut0, upNumerical value be assigned to cut
Machine upper limit Cup, complete to cut machine upper limit CupSearch.
6. according to claim 4 cut machine range searching method, it is characterised in that the S22, cut using dichotomizing search
Machine lower limit CdownIncluding,
S221, will cut machine pre-determined lower limit C0, downGive 0 to be worth, the numerical value for cutting machine amount C is assigned to cut machine preset upper limit C0, up；
S222, according to cutting machine pre-determined lower limit C0, downWith cut machine preset upper limit C0, up, calculate machine amount C to be cutx, machine amount C to be cutx
Computing formula be
S223, according to machine amount C to be cutx, determining and cut unit, and judges to cut and whether power system is cut after unit in stable；
S2231, if power system is in stable, by machine amount C to be cutxNumerical value be assigned to cut machine pre-determined lower limit C0, down；
S2232, if band is cut machine amount C in unstable by power systemxNumerical value is assigned to cut machine preset upper limit C0, up；
S224, judges to cut machine pre-determined lower limit C0, downWith cut machine preset upper limit C0, upDifference whether stable judge step more than default
Long CSTEP；
If so, then return to step S222；
If it is not, then now cut machine pre-determined lower limit C0, downMachine lower limit C is as cutdown, machine pre-determined lower limit C will be cut0, downNumerical value assign
Cut machine lower limit Cdown, complete to cut machine lower limit CdownSearch.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109546691A (en) * | 2018-11-28 | 2019-03-29 | 云南电网有限责任公司 | A kind of electric system generator rotor angle Transient Instability cuts the searching method and device of machine automatically |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101299537A (en) * | 2007-11-08 | 2008-11-05 | 江苏省电力公司 | Centralized decision-making real time emergency control method for large electric network overloading |
| CN101436779A (en) * | 2008-12-12 | 2009-05-20 | 中国电力科学研究院 | Transient, dynamic stabilization aid decision-making automatic searching method based on parallel calculation |
| CN105279568A (en) * | 2014-12-25 | 2016-01-27 | 贵州电网公司电力调度控制中心 | Electric power system over frequency generator tripping strategy setting method |
-
2016
- 2016-11-30 CN CN201611092304.0A patent/CN106451475B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101299537A (en) * | 2007-11-08 | 2008-11-05 | 江苏省电力公司 | Centralized decision-making real time emergency control method for large electric network overloading |
| CN101436779A (en) * | 2008-12-12 | 2009-05-20 | 中国电力科学研究院 | Transient, dynamic stabilization aid decision-making automatic searching method based on parallel calculation |
| CN105279568A (en) * | 2014-12-25 | 2016-01-27 | 贵州电网公司电力调度控制中心 | Electric power system over frequency generator tripping strategy setting method |
Non-Patent Citations (1)
| Title |
|---|
| 任伟: "《天津大学博士学位论文》", 1 April 2009 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109546691A (en) * | 2018-11-28 | 2019-03-29 | 云南电网有限责任公司 | A kind of electric system generator rotor angle Transient Instability cuts the searching method and device of machine automatically |
| CN109546691B (en) * | 2018-11-28 | 2019-10-25 | 云南电网有限责任公司 | A kind of electric system generator rotor angle Transient Instability cuts the searching method and device of machine automatically |
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