CN109617085A - Fast cut back optimal control method under a kind of malfunction - Google Patents
Fast cut back optimal control method under a kind of malfunction Download PDFInfo
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- CN109617085A CN109617085A CN201910078187.XA CN201910078187A CN109617085A CN 109617085 A CN109617085 A CN 109617085A CN 201910078187 A CN201910078187 A CN 201910078187A CN 109617085 A CN109617085 A CN 109617085A
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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
- 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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- 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]
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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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Abstract
The present invention provides fast cut back optimal control method under a kind of malfunction, this method comprises: S1, the system of determination can cutting load, by can cutting load alternately cutting load object and according to the significance level of load to can cutting load be classified；Operation of power networks state when S2, acquisition power grid failure, need to cut off load in line computation according to operation of power networks state, and establish the mathematical model of cutting load；S3, examination meets the optimal cutting load combination of the mathematical model in alternative cutting load object.Optimal control method of the invention improves the accuracy of cutting load while guaranteeing that mains frequency, voltage restore, and guarantees important load not power loss in electric network fault, avoids cutting load bring personal safety danger and biggish economic loss.
Description
Technical field
It is negative the present invention relates to quickly being cut under fast cut back technical field under malfunction more particularly to a kind of malfunction
Lotus optimal control method.
Background technique
With the continuous increase of power grid scale and electric network composition complexity, dependence of the socio-economic development to electric system
Property is gradually reinforced, and the requirement to safe and stable operation of power system is also higher and higher.When power grid occurs urgent shape by failure
When condition, the cutting load device in system will execute corresponding predetermined registration operation cut-out load, restore frequency and voltage as early as possible
To normal operating condition.
Low-frequency and low-voltage Emergency Control Strategy usually carries out stability Calculation to power grid in advance at present, and off-line setting calculation, which goes out, to be occurred
Malfunction under each round load that needs to cut off, form corresponding Policy Table.When after the accident, cutting load system is examined
System real-time frequency and voltage condition are measured, cutting load amount required for being calculated according to the good Policy Table of off-line setting calculation, then root
According to can cutting load it is flux matched go out a suitable cutting load combine.
Existing low-frequency and low-voltage Emergency Control Strategy is also deposited while solving emergency lower frequency, sag issue
In certain drawbacks:
(1) delay is cut negative after traditional low-frequency low-voltage load sheding criterion often waits frequency or voltage to drop to a certain particular value
Lotus is substantially still a kind of means of static analysis, configure low-frequency low-voltage load shedding when do not consider voltage dynamic, frequency dynamic and
Reciprocal effect between power dynamic.
(2) the low-frequency and low-voltage cutting load scheme multi-pass being widely used in power grid at present is crossed off-line calculation system and is likely encountered most
Power shortage under serious way distributes the off-load load of each round, but with power shortage caused by power grid physical fault
It not necessarily matches, to reduce the accuracy of cutting load, can not be adapted to that the Large Scale Interconnected Systems method of operation is changeable, malfunction
The development trends such as more than changeable, uncertain factor.
(3) after failure occurs, system needs cutting load control strategy quickly and accurately to calculate cutting load place and cut
Load capacity.For a long time, the research in relation to low-frequency and low-voltage cutting load assumes that cutting load point is designated, to avoid it
Optimization problem.It is computationally intensive, to calculate the time long when with the control methods such as the method for exhaustion, genetic algorithm, it not can guarantee urgent feelings
Cutting load device quick acting under condition.
Summary of the invention
Technical problem to be solved by the present invention lies in provide fast cut back optimal control side under a kind of malfunction
Method, this method can overcome the cutting load device that the calculating time existing in the prior art is long, not can guarantee in emergency circumstances fast
The problem of quick-action is made.
In order to solve the above technical problem, the present invention provides fast cut back optimal control method under a kind of malfunction,
Include the following steps:
S1, the system of determination can cutting load, by can cutting load alternately cutting load object and according to the significance level of load
To can cutting load be classified；
S2, operation of power networks state when power grid breaks down is obtained, need to be cut off according to operation of power networks state in line computation negative
Lotus amount, and establish the mathematical model of cutting load；
S3, examination meets the optimal cutting load combination of the mathematical model in alternative cutting load object.
Wherein, the significance level according to load to can cutting load carry out classification specifically include:
According to the significance level of load can cutting load be divided into nonproductive load, auxiliary burden and main produce load three
Class.
Wherein, the step S2 is specifically included:
Operation of power networks state when power grid breaks down is obtained, when system frequency drops to the frequency values of setting, according to
Operation of power networks state and frequency, which decline situation, need to cut off load power in line computation；
According to load power need to be cut off and the corresponding load power of alternative cutting load object establishes the mathematical model of cutting load；
When load power and the unequal corresponding general power of alternative cutting load object need to be cut off by mathematical model judgement,
It was selected to cut or owe the progress load excision of butt formula according to system frequency change rate.
Wherein, the mathematical model are as follows:
s.t.Ci=0 or 1 i=1,2 ..., n
Wherein, CiIt indicates the 0-1 variable whether No. i-th alternative cutting load object is cut off, indicates excision i-th when being 1
Number load point load indicates to retain No. i-th load point load when being 0；PiFor the load curtailment function of No. i-th alternative cutting load
Rate；PCTo need the power volume cut off, n is the total number of alternative load point.
Wherein, described to select to cut or owe butt formula according to system frequency change rate to specifically include:
It calculates and judges system frequency change rate whether less than the first setting value, if it is less, selecting to owe butt formula simultaneously
It establishes and corresponding owes to cut objective function；Otherwise, it selected butt formula and established corresponding mistake to cut objective function.
It is wherein, described to owe to cut objective function are as follows:
The mistake cuts objective function are as follows:
Wherein, the step S3 is specifically included:
When selecting butt formula, in alternative cutting load object examination meet the mistake cut objective function it is optimal cut it is negative
Lotus combination；When selecting to owe butt formula, in alternative cutting load object examination meet it is described owe to cut objective function it is optimal cut it is negative
Lotus combination.
Wherein, the examination in alternative cutting load object meets the specific packet of optimal cutting load combination of the mathematical model
It includes:
Whether S31, all nonproductive load general powers of examination meet the requirement that need to cut off load power, if it is satisfied, then
All non-generation loads alternately cutting load and are executed into step S34, it is no to then follow the steps S32；
S32, all nonproductive loads of excision, and calculate and need to cut off between load power and all nonproductive load general powers
The first power shortage, check whether all auxiliary burden general powers meet power shortage, if it is satisfied, then by all non-
Produce load and auxiliary burden alternately cutting load and execute step S34, no to then follow the steps S33；
S33, all auxiliary burdens of excision, and calculate between the first power shortage and all auxiliary burden general powers the
Two power shortages, check whether all main produce load general powers meet the second power shortage, if it is satisfied, then by all
Nonproductive load, auxiliary burden and main produce load alternately cutting load and execute step S34, otherwise, cut off all masters
Produce load；
S34, optimal cutting load combination is checked in alternative cutting load using implicit enumeration method.
The beneficial effect of the embodiment of the present invention is: the present invention need to cut negative according to grid operating conditions dynamic adjustment after failure
Lotus amount carries out priority ranking according to load importance, selected the principle tissue cutting load for cutting or owing to cut as needed, and adopt
Cutting load place and cutting load amount are quickly determined with implicit enumeration method.Method of the invention is cut negative according to the selection of load sequence of importance
The place of lotus improves the accuracy of cutting load while guaranteeing that mains frequency, voltage restore, and guarantees important load in electricity
Not power loss when net failure, avoids cutting load bring personal safety danger and biggish economic loss, secondly, this method selection is hidden
Enumerative technique select cutting load point, power grid occur local fault enter the state of emergency operation, system inertia become smaller when, can be fast
Speed in response to determining that loading condiction cutting load place and cutting load amount, ensure that the safe and stable operation of power grid, save 50%
Above response time, last method of the invention determined frequency change rate using by way of owing to cut or cross and cutting,
It does not influence to reduce influence of the cutting load to user while system frequency is restored, reduces system because of economic damage caused by cutting load
It loses.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.
Fig. 1 be the embodiment of the present invention a kind of malfunction under fast cut back optimal control method flow diagram.
Fig. 2 be the embodiment of the present invention a kind of malfunction under the hidden of fast cut back optimal control method enumerate analytic approach
Schematic diagram.
Specific embodiment
The explanation of following embodiment be with reference to attached drawing, can be to the specific embodiment implemented to the example present invention.
It is illustrated referring to Fig. 1, the embodiment of the present invention one provides fast cut back optimization control under a kind of malfunction
Method processed, this method comprises the following steps:
S1, the system of determination can cutting load, by can cutting load alternately cutting load object and according to the significance level of load
To can cutting load be classified.
In the power system, load can be divided into according to the significance level of load by interruptible load and can not interrupted negative
Lotus.Interruptible load can be divided into three classes again: the Ith type load is nonproductive load, such as office lighting, household electricity；IIth
Type load is auxiliary burden, such as workshop air-conditioning, blower；IIIth type load is main produce load.Wherein the Ith class and the IIth class
After load rejection, personal safety danger and biggish economic loss should not be caused to user；And after the IIIth type load interrupts, it does not answer
It is dangerous that personal safety is caused to user, but certain economic loss will be will cause.Cutting load Optimal Control System is in power grid
Can cutting load amount be acquired, and according to the importance of load can cutting load amount be divided into three classes storage in systems alternately
Cutting load object.After power grid breaks down, according to needing cutting load amount to cut off three classes interruptible load, uninterrupted load step by step
Then it is not involved in cutting load Optimal Control Strategy.
S2, operation of power networks state when power grid breaks down is obtained, need to be cut off according to operation of power networks state in line computation negative
Lotus amount, and establish the mathematical model of cutting load.
When partial electric grid breaks down, system needs to stablize at this time it is possible that frequency stabilization, Voltage-stabilizing Problems
Control system takes effective cutting load measure in a short time.
When power grid breaks down, low-frequency and low-voltage cutting load device detects operation of power networks situation, after system jam
When frequency drops to the frequency values of setting, load need to be cut off by being calculated online according to grid fault conditions and frequency decline situation
Amount, and according to the mathematical model that need to cut off load and establish low-frequency and low-voltage cutting load problem:
s.t.Ci=0 or 1 i=1,2 ..., n
Wherein: CiIt indicates the 0-1 variable whether No. i-th alternative cutting load object is cut off, indicates excision i-th when being 1
Number load object indicates to retain No. i-th load object when being 0；PiFor the load curtailment function of No. i-th alternative cutting load object
Rate；PCTo need the power volume cut off.
The power of load and alternative need to be cut off when load need to be cut off and alternative cutting load amount can not exactly match
When the general power of cutting load amount is unequal, selected to cut or owe butt formula according to the value of current system frequency change rate.When frequency
When rate change rate is greater than the first setting value, butt formula can be used, prevents system frequency from further sharply declining；When frequency becomes
When rate is less than the first setting value, to reduce influence of the cutting load to user, economic loss can be reduced using butt formula is owed.
First setting value can be adjusted according to the actual conditions of local power grid.
It is converted according to mathematical modulo pattern (1) of the information above to fast cut back, when frequency change rate is greater than first
When setting value, butt formula can be used to convert an accepted way of doing sth (2), it, can be using deficient when frequency change rate is less than the first setting value
Butt formula converts an accepted way of doing sth (3).The alternative cutting load objects of n acquired in real time for stabilizing control system, fast cut back it is excellent
Change mathematical model and is converted to following form.
Optimized and cut objective function:
Optimization owes to cut objective function:
It is required that constraint condition Δ P >=0 need to be met when excessive cutting load, min Δ P is solved；It is required that being needed when owing amount cutting load
Meet constraint condition Δ P≤0, solves max Δ P.From transformed mathematical model as it can be seen that no matter for excessive cutting load or owing
Cutting load is measured, the value of Δ P is closer to zero, and corresponding cutting load combination is better, and the influence caused by actual electric network is just smaller.
S3, examination meets the optimal cutting load combination of the mathematical model in alternative cutting load object.
When using butt formula, then optimal cutting load combination satisfaction is checked in determining alternative cutting load and was optimized
Cut objective function, when using butt formula is owed, then checked in determining alternative cutting load optimal cutting load combination meet it is excellent
Change owes to cut objective function.
Following principle need to be followed when checking the combination of optimal cutting load: by power shortage according to complete regional three classes after the system failure
Load total amount is sequentially allocated, by alternative cutting load object according to priority from high to low sequence choosing cut, if certain class alternatively cut it is negative
Lotus object is enough cut, then quickly determines cutting load object with implicit enumeration method；If the high load of priority is not able to satisfy still after cutting entirely
It is required that then after the Ith type load of complete resection, then judge whether the IIth type load amount enough cuts, and so on, until the load of excision
Amount meets power shortage.Specifically:
Step 31: whether the Ith type load total amount of examination meets the requirement of cutting load amount, is classified as the Ith type load if meeting
Alternative cutting load object skips to step 34 and quickly finds optimal cutting load combination with implicit enumeration method, and step is skipped to if being unsatisfactory for
32；
Step 32: preferential to cut off all the Ith type loads, power shortage part is checked in the IIth type load, if the IIth class
Load total amount, which meets condition and the IIth type load is then classified as alternative cutting load object skips to step 34, quickly seeks with implicit enumeration method
It looks for optimal cutting load to combine, step 33 is skipped to if being unsatisfactory for；
Step 33: preferential all the I, the II type load, the power shortage part of cutting off is checked in the IIIth type load, if the IIIth
Type load total amount meet condition then by the IIIth type load be classified as alternative cutting load object skip to step 34 with implicit enumeration method it is quick
Optimal cutting load combination is found, all the I, the II, III type load are cut off if being unsatisfactory for；
Step 34: the optimum combination of alternative cutting load is determined using the hidden method enumerated.
Below by cross cut it is hidden enumerate for be illustrated.Alternative cutting load object is sorted according to certain sequence, it is each
The value of a load point variable non-zero i.e. 1, can list hidden Enumeration Tree shown in Fig. 2.By each load point variation coefficient CiValue is from complete
Portion is 0 beginning, so that Δ P value minimum, examines its feasibility.From variation coefficient CiAll 0 sets out branch, by becoming some
Coefficient of discharge CiConversion from 0 to 1 gradually increases target function value since minimum, to realize from extra small infeasible solutions to can
Row solution filtering, also avoids skipping the smaller feasible solution of Δ P value, can make PiIt is worth small CiFirst become 1 from 0.Because the sequence examined is
Since the smallest solution point of Δ P value and according to the sequence that Δ P value is incremented by, therefore first feasible solution found in inspection is most
Excellent solution terminates branch and exports optimal solution.
Fast cut back optimal control method under the malfunction of the embodiment of the present invention, according to grid operating conditions after failure
Dynamic adjustment needs cutting load amount, carries out priority ranking according to load importance, selected the principle for cutting or owing to cut as needed
Cutting load is organized, and cutting load place and cutting load amount are quickly determined using implicit enumeration method.Method of the invention is according to load weight
The place of the property wanted sequential selection cutting load improves the accuracy of cutting load while guaranteeing that mains frequency, voltage restore,
Guarantee important load not power loss in electric network fault, avoid cutting load bring personal safety danger and biggish economic loss,
Secondly, this method selection implicit enumeration method selects cutting load point, there is local fault in power grid and enter state of emergency operation, system
When inertia becomes smaller, cutting load place and the cutting load amount of loading condiction can be determined with quick response, ensure that the safe, steady of power grid
Fixed operation, saves for 50% or more response time, and last method of the invention is determined to use by frequency change rate and owes to cut
Or the mode cut is crossed, influence of the cutting load to user is reduced while not influencing system frequency and restoring, reduction system is because cutting
Economic loss caused by load.
The above disclosure is only the preferred embodiments of the present invention, cannot limit the right model of the present invention with this certainly
It encloses, therefore equivalent changes made in accordance with the claims of the present invention, is still within the scope of the present invention.
Claims (8)
1. fast cut back optimal control method under a kind of malfunction, which comprises the steps of:
S1, the system of determination can cutting load, by can cutting load alternately cutting load object and according to the significance level of load to can
Cutting load is classified；
Operation of power networks state when S2, acquisition power grid failure, need to cut off load in line computation according to operation of power networks state,
And establish the mathematical model of cutting load；
S3, examination meets the optimal cutting load combination of the mathematical model in alternative cutting load object.
2. the method according to claim 1, wherein the significance level according to load to can cutting load carry out
Classification specifically includes:
According to the significance level of load can cutting load be divided into nonproductive load, auxiliary burden and main produce load three classes.
3. according to the method described in claim 2, it is characterized in that, the step S2 is specifically included:
Operation of power networks state when power grid breaks down is obtained, when system frequency drops to the frequency values of setting, according to power grid
Operating status and frequency, which decline situation, need to cut off load power in line computation；
According to load power need to be cut off and the corresponding load power of alternative cutting load object establishes the mathematical model of cutting load；
When load power and the unequal corresponding general power of alternative cutting load object need to be cut off by mathematical model judgement, according to
System frequency change rate selected to cut or owe the progress load excision of butt formula.
4. according to the method described in claim 3, it is characterized in that, the mathematical model are as follows:
s.t.Ci=0 or 1 i=1,2 ..., n
Wherein, CiIt indicates the 0-1 variable whether No. i-th alternative cutting load object is cut off, No. i-th load of excision is indicated when being 1
The load of object indicates the load for retaining No. i-th load object when being 0；PiIt is negative for cutting off for No. i-th alternative cutting load object
Lotus power；PCTo need the power volume cut off, n is the total number of alternative cutting load object.
5. according to the method described in claim 4, it is characterized in that, described selected to cut or owe according to system frequency change rate
Butt formula specifically includes:
It calculates and judges system frequency change rate whether less than the first setting value, if it is less, selecting to owe butt formula and establish
It is corresponding to owe to cut objective function；Otherwise, it selected butt formula and established corresponding mistake to cut objective function.
6. according to the method described in claim 5, it is characterized in that, described owe to cut objective function are as follows:
The mistake cuts objective function are as follows:
7. according to the method described in claim 6, it is characterized in that, the step S3 is specifically included:
When selecting butt formula, examination meets the optimal cutting load group that the mistake cuts objective function in alternative cutting load object
It closes；When selecting to owe butt formula, examination meets the optimal cutting load group for owing to cut objective function in alternative cutting load object
It closes.
8. according to the method described in claim 7, it is characterized by: the examination in alternative cutting load object meets the number
The optimal cutting load combination for learning model specifically includes:
Whether S31, all nonproductive load general powers of examination meet the requirement that need to cut off load power, if it is satisfied, then by institute
There is non-generation load alternately cutting load and to execute step S34, it is no to then follow the steps S32；
S32, all nonproductive loads of excision, and calculate need to cut off between load power and all nonproductive load general powers the
One power shortage, checks whether all auxiliary burden general powers meet power shortage, if it is satisfied, then by all nonproductive
Load and auxiliary burden alternately cutting load and execute step S34, no to then follow the steps S33；
S33, all auxiliary burdens of excision, and calculate the second function between the first power shortage and all auxiliary burden general powers
Rate vacancy, checks whether all main produce load general powers meet the second power shortage, if it is satisfied, then by all non-lifes
It produces load, auxiliary burden and main produce load and alternately cutting load and executes step S34, otherwise, cut off all main production
Load；
S34, optimal cutting load combination is checked in alternative cutting load using implicit enumeration method.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110350540A (en) * | 2019-05-28 | 2019-10-18 | 广东电网有限责任公司电力调度控制中心 | A kind of fine cutting load method based on On-line Estimation frequency character of load |
| CN110425706A (en) * | 2019-07-29 | 2019-11-08 | 南京理工大学 | Polymerization air conditioner load towards power grid peak clipping regulates and controls method |
| CN111952981A (en) * | 2020-08-18 | 2020-11-17 | 浙江浙能技术研究院有限公司 | Method for accurately controlling frequency of boiler after fault of enterprise power grid |
| CN116362622A (en) * | 2023-04-23 | 2023-06-30 | 国网河南省电力公司电力科学研究院 | Power grid power supply capacity assessment method and device under extreme meteorological conditions |
| CN116632858A (en) * | 2023-06-07 | 2023-08-22 | 南京国电南自电网自动化有限公司 | Self-provided power grid power control method based on electronic load |
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