CN110247403A - A kind of judgment method that the isolated island internal loading containing distributed generation resource is cut down - Google Patents
A kind of judgment method that the isolated island internal loading containing distributed generation resource is cut down Download PDFInfo
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- CN110247403A CN110247403A CN201910650914.5A CN201910650914A CN110247403A CN 110247403 A CN110247403 A CN 110247403A CN 201910650914 A CN201910650914 A CN 201910650914A CN 110247403 A CN110247403 A CN 110247403A
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- 238000000034 method Methods 0.000 title claims abstract description 28
- 238000011084 recovery Methods 0.000 claims abstract description 15
- 230000005611 electricity Effects 0.000 claims description 9
- 230000007423 decrease Effects 0.000 claims description 6
- 230000008569 process Effects 0.000 claims description 4
- 230000000717 retained effect Effects 0.000 claims description 3
- 230000008901 benefit Effects 0.000 abstract description 8
- 230000009467 reduction Effects 0.000 abstract description 7
- 230000008859 change Effects 0.000 description 4
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- 235000006508 Nelumbo nucifera Nutrition 0.000 description 3
- 235000006510 Nelumbo pentapetala Nutrition 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 238000010248 power generation Methods 0.000 description 3
- 239000006185 dispersion Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
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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
-
- H02J3/382—
-
- 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]
-
- 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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/388—Islanding, i.e. disconnection of local power supply from the network
-
- 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
-
- 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 judgment method for the isolated island internal loading reduction containing distributed generation resource that the invention discloses a kind of, distributed generation resource power output summation ∑ P in power module, including any time isolated island during including the following steps: S1, constructing isolated operationDGtAnd total electrical charge ∑ P in isolated island in the momentLit；S2, abatement load criterion is established；S3, isolated island internal loading cuts down judgment models in fault element recovery process during constructing isolated operation, this method is using power-balance and reduction plans criterion as judgement basis, determine whether the isolated island internal loading containing distributed generation resource is cut down, realize the purpose of control payload, to reach the balance of the power output and load power of the renewable energy system in isolated island, a variety of benefits can be provided for the promotion of power supply reliability in isolated island safe power supply and isolated island, and this method solve supply district problems in the isolated island as caused by a variety of uncertain factors, reduce realization difficulty.
Description
Technical field
The present embodiments relate to power industry technical fields, and in particular to a kind of isolated island internal loading containing distributed generation resource
The judgment method of reduction.
Background technique
With the rapid development of economy, electricity needs is growing, but as grid-connected scale is gradually expanded, the big rule of the energy
The grid-connected drawback of mould is also increasingly prominent, and cost of investment is high, operation difficulty is big, it is difficult to meet user to power grid high safety, Gao Ke
By the demand of property.In recent years, the power failure incident occurred in succession sufficiently exposes the fragility of power grid.To solve the above problems,
Distributed generation resource is paid attention to as a kind of new energy power generation technology efficiently, economic and environmentally friendly by every country in the world.
Distributed power generation can provide the unrivaled reliability of conventional electric power system and economy, have pollution less, can
The advantage high by property, efficiency of energy utilization is high, at the same distributed power supply location flexibly, dispersion the characteristics of admirably adapted to dispersion
Electricity needs and resource distribution, but itself is there are problems, to reduce impact of the distributed generation resource to island-grid, also needs
The failure operation mode and reliability estimation method for changing conventional electrical distribution net need to consider that distributed generation resource grid-connected island etc. is transported
Row state brings new challenge for the reliability service assessment of electric system.
Isolated island in the operating mode, due to renewable energy system power output fluctuation and intermittence, at this time not
It can guarantee that isolated island internal loading point moment can obtain power support from renewable energy power generation.Therefore, it is necessary to a variety of not in calculating
It determines and determines supply district in isolated island on the basis of factor, to achieve the purpose that control payload, to reach in isolated island
The balance of renewable energy system power output and load power, this method uncertain factor in need of consideration is more, and it is difficult to realize
Degree is big.
Summary of the invention
For this purpose, the embodiment of the present invention provides a kind of judgment method that the isolated island internal loading containing distributed generation resource is cut down, with function
Rate balance and reduction plans criterion determine whether the isolated island internal loading containing distributed generation resource is cut down as judgement basis, realize control
The purpose of payload processed, to reach the balance of the renewable energy system power output and load power in isolated island, with solution
Certainly can not determine supply district in isolated island according to a variety of uncertain factors in the prior art, thus be unable to control in isolated island can be again
The problem of raw energy electricity generation system power output and load power reach balance.
To achieve the goals above, embodiments of the present invention provide the following technical solutions:
A kind of judgment method that the isolated island internal loading containing distributed generation resource is cut down, includes the following steps:
Distributed generation resource power output summation ∑ P in power module, including any time isolated island during S1, building isolated operationDGt
And total electrical charge ∑ P in isolated island in the momentLit；
S2, abatement load criterion is established；
Isolated island internal loading cuts down judgment models in fault element recovery process during S3, building isolated operation.
As a preferred solution of the present invention, in the step S1, with total load in any time isolated islandAnd
Distributed generation resource power output summation ∑ P in the moment isolated islandDGtOn the basis of.
As a preferred solution of the present invention, abatement load criterion described in step S2 includes:
A, in distributed generation resource power output range, abatement load as few as possible；
B, load point is cut down according to the significance level of load point in isolated island；
C, cut down in load process, do not consider the dynamic switching of load point during isolated operation.
As a preferred solution of the present invention, isolated island internal loading cuts down judgment formula in the step S3 are as follows:
As a preferred solution of the present invention, abatement load target letter is established according to the abatement load judgment formula
Number:
In formula, N indicates isolated island internal loading points, and X (k) indicates that the state of k-th of load point, 0 expression load point are cut down,
1 indicates that load point is retained.
The step as a preferred solution of the present invention: abatement load is established according to load abatement judgment formula
Objective function includes the following steps:
S601, judge distributed generation resource power output summation ∑ P in t moment isolated islandDGtWhether it is more than or equal to total in t moment isolated island
Load
If S602, formula are set up, fault element recovery time etr is gradually decremented to 0 during isolated operation, bears in isolated island
Lotus, which cuts down judgement, to terminate；
If S603, formula are invalid, successively decrease load step by step and the load that successively decreases during isolated operation does not restore electricity；
S604, when fault element recovery time etr is not zero during isolated operation, step S601 is repeated；
When fault element recovery time etr is zero during S605, isolated operation, then the isolated island internal loading containing distributed generation resource
Cutting down judgement terminates.
Embodiments of the present invention have the advantages that
The present invention is substantially using power-balance and reduction plans criterion as judgement basis, according to distributed generation resource in isolated island
Its this feature of stochastic uncertainty and isolated island internal loading size with time change of contributing, orphan of the decision containing distributed generation resource
Whether island internal loading is cut down, and has achieved the purpose that control payload, to realize the renewable energy system in isolated island
The balance of power output and load power, can provide a variety of benefits for the promotion of power supply reliability in isolated island safe power supply and isolated island
Place；And this method solve supply district problem in the isolated island as caused by a variety of uncertain factors, realization difficulty is reduced.
Detailed description of the invention
It, below will be to embodiment party in order to illustrate more clearly of embodiments of the present invention or technical solution in the prior art
Formula or attached drawing needed to be used in the description of the prior art are briefly described.It should be evident that the accompanying drawings in the following description is only
It is merely exemplary, it for those of ordinary skill in the art, without creative efforts, can also basis
The attached drawing of offer, which is extended, obtains other implementation attached drawings.
Structure depicted in this specification, ratio, size etc., only to cooperate the revealed content of specification, for
Those skilled in the art understands and reads, and is not intended to limit the invention enforceable qualifications, therefore does not have technical
Essential meaning, the modification of any structure, the change of proportionate relationship or the adjustment of size are not influencing the function of the invention that can be generated
Under effect and the purpose that can reach, should all still it fall in the range of disclosed technology contents obtain and can cover.
Fig. 1 is the judgment method flow chart that the isolated island internal loading in embodiment of the present invention containing distributed generation resource is cut down；
Fig. 2 is that load cuts down decision flow chart in embodiment of the present invention.
Specific embodiment
Embodiments of the present invention are illustrated by particular specific embodiment below, those skilled in the art can be by this explanation
Content disclosed by book is understood other advantages and efficacy of the present invention easily, it is clear that described embodiment is the present invention one
Section Example, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art are not doing
Every other embodiment obtained under the premise of creative work out, shall fall within the protection scope of the present invention.
As shown in Figure 1, the judgment method that the isolated island internal loading that the present invention provides a kind of containing distributed generation resource is cut down, with function
Rate balance and reduction plans criterion are as judgement basis, its contribute stochastic uncertainty and isolated island according to distributed generation resource in isolated island
Internal loading size is also this feature with time change, determines whether the isolated island internal loading containing distributed generation resource is cut down, real
The purpose of control payload is showed, to reach putting down for the renewable energy system power output and load power in isolated island
Weighing apparatus, can provide a variety of benefits for the promotion of power supply reliability in isolated island safe power supply and isolated island.
Specifically, a kind of judgment method that the isolated island internal loading containing distributed generation resource is cut down, includes the following steps:
Distributed generation resource power output summation ∑ P in power module, including any time isolated island during S1, building isolated operationDGt
And total electrical charge in isolated island in the moment
S2, abatement load criterion is established；
Isolated island internal loading cuts down judgment models in fault element recovery process during S3, building isolated operation.
In the step S1, with total load in any time isolated islandAnd distributed generation resource goes out in the moment isolated island
Power summation ∑ PDGtOn the basis of, judge whether isolated island internal loading is cut down by carrying out compared with after to the two numeric ratio.
In the present embodiment, by distributed generation resource power output summation ∑ P in the isolated island of any timeDGtIn any time isolated island
Total loadIt makes comparisons, a variety of uncertain factors is considered in the two summation, it can be on the basis of a variety of uncertain factors
Supply district in upper determining isolated island, to achieve the purpose that control payload.
Abatement load criterion described in step S2 specifically includes that
A, in distributed generation resource power output range, abatement load as few as possible；
B, load point is cut down according to the significance level of load point in isolated island；
C, cut down in load process, do not consider the dynamic switching of load point during isolated operation.
In the present embodiment, load cuts down criterion mainly in distributed generation resource power output range, as much as possible to supply for load
Electricity, also, preferentially retain the higher load point of significance level when abatement, to guarantee isolated island internal loading point safety to greatest extent
Stable operation.
In the present embodiment, main to carry out load abatement according to the above abatement criterion, the load isolated island cut out is being examined
Survey no longer restores electricity in the phase, until fault element reparation or exclusion, system can just restore electricity.
Isolated island internal loading cuts down judgment formula in the step S3 are as follows:
In the present embodiment, using power-balance and reduction plans criterion as judgement basis, according to distributed generation resource in isolated island
Its power output stochastic uncertainty and isolated island internal loading size are as this feature of time change is as judgment basis, this mistake
A variety of uncertain factors are covered in journey to distributed generation resource power output summation and any time isolated island in the isolated island of any time
The influence of interior total load, therefore, the foundation are realized on the basis of considering various factors, can effectively be used
It is that the one kind promoted to power supply reliability in isolated island has in isolated island in the practical operation of supply district and control payload
Benefit supplement.
Abatement load objective function is established according to load abatement judgment formula:
In formula, N indicates isolated island internal loading points, and X (k) indicates that the state of k-th of load point, 0 expression load point are cut down,
1 indicates that load point is retained.
In the present embodiment, if being unsatisfactory for load abatement judgment formula, need to be cut down according to abatement load objective function
The load of a part of load point, to ensure the power balance in isolated island.
In the present embodiment, the judgment formula of load abatement and the objective function of load abatement constitute the abatement of load abatement
Model may insure the power balance in isolated island according to load abatement criterion.
In the present embodiment, the judgement of load abatement and its abatement model solution process are as follows: firstly, all negative in setting isolated island
The state of lotus point is 1, and for any time period during isolated operation, being calculated according to the power module established in step S1 should
Distributed generation resource power output summation ∑ P in the isolated island at momentDGtAnd total electrical charge ∑ P in isolated island in the momentLit, and according to worth big
Small judgement then preferentially cuts down the smallest load of internal loading total amount during isolated operation when being unsatisfactory for load abatement judgment formula
The time this moment is put and returns, until meeting load abatement judgment formula.
As shown in Fig. 2, establishing abatement load objective function according to load abatement judgment formula, include the following steps:
S601, judge distributed generation resource power output summation ∑ P in t moment isolated islandDGtWhether it is more than or equal to total in t moment isolated island
Load ∑ PLit；
If S602, formula are set up, fault element recovery time etr is gradually decremented to 0 during isolated operation, bears in isolated island
Lotus, which cuts down judgement, to terminate；
If S603, formula are invalid, successively decrease load step by step and the load that successively decreases during isolated operation does not restore electricity；
S604, when fault element recovery time etr is not zero during isolated operation, step S601 is repeated；
When fault element recovery time etr is zero during S605, isolated operation, then the isolated island internal loading containing distributed generation resource
Cutting down judgement terminates.
In the present embodiment, load abatement judgment step is mainly realized on the basis of load cuts down model, and isolated island is transported
Fault element recovery time etr is set as independent variable between the departure date, and as judgment basis, the load for cutting down load point is used as because becoming
Whether amount, be zero according to fault element recovery time etr during isolated operation, judges that isolated island internal loading abatement judges whether to tie
Beam.
In the present embodiment, the judgment method that the isolated island internal loading containing distributed generation resource is cut down, mainly with any time orphan
It is lonely to carry out judgement to the two numeric ratio on the basis of distributed generation resource power output summation in the moment isolated island compared with after for total load in island
Whether island internal loading is cut down, and the judgment method cut down by constructing this isolated island internal loading containing distributed generation resource realizes control
The purpose of payload processed, thus reach the balance of the renewable energy system power output and load power in isolated island, it can
A variety of benefits are provided for the promotion of power supply reliability in isolated island safe power supply and isolated island, and this method solve by a variety of not true
Determine supply district problem in isolated island caused by factor, reduces realization difficulty.
Although above having used general explanation and specific embodiment, the present invention is described in detail, at this
On the basis of invention, it can be made some modifications or improvements, this will be apparent to those skilled in the art.Therefore,
These modifications or improvements without departing from theon the basis of the spirit of the present invention are fallen within the scope of the claimed invention.
Claims (6)
1. a kind of judgment method that the isolated island internal loading containing distributed generation resource is cut down, which comprises the steps of:
Distributed generation resource power output summation ∑ P in power module, including any time isolated island during S1, building isolated operationDGtAnd
Total electrical charge ∑ P in isolated island in the momentLit；
S2, abatement load criterion is established；
Isolated island internal loading cuts down judgment models in fault element recovery process during S3, building isolated operation.
2. the judgment method that a kind of isolated island internal loading containing distributed generation resource according to claim 1 is cut down, feature exist
In in the step S1, with total load ∑ P in any time isolated islandLitAnd distributed generation resource power output summation in the moment isolated island
∑PDGtOn the basis of.
3. the judgment method that a kind of isolated island internal loading containing distributed generation resource according to claim 1 is cut down, feature exist
In abatement load criterion described in step S2 includes:
A, in distributed generation resource power output range, abatement load as few as possible；
B, load point is cut down according to the significance level of load point in isolated island；
C, cut down in load process, do not consider the dynamic switching of load point during isolated operation.
4. the judgment method that a kind of isolated island internal loading containing distributed generation resource according to claim 1 is cut down, feature exist
In isolated island internal loading cuts down judgment formula in the step S3 are as follows:
∑PLit≤∑PDGt。
5. the judgment method that a kind of isolated island internal loading containing distributed generation resource according to claim 4 is cut down, feature exist
According to load abatement judgment formula foundation abatement load objective function:
In formula, N indicates isolated island internal loading points, and X (k) indicates that the state of k-th of load point, 0 expression load point are cut down, 1 table
Show that load point is retained.
6. the judgment method that a kind of isolated island internal loading containing distributed generation resource according to claim 5 is cut down, feature exist
In the step: establishing abatement load objective function according to load abatement judgment formula, include the following steps:
S601, judge distributed generation resource power output summation ∑ P in t moment isolated islandDGtWhether total load in t moment isolated island is more than or equal to
∑PLit；
If S602, formula are set up, fault element recovery time etr is gradually decremented to 0 during isolated operation, and isolated island internal loading is cut
Subtracting judgement terminates；
If S603, formula are invalid, successively decrease load step by step and the load that successively decreases during isolated operation does not restore electricity；
S604, when fault element recovery time etr is not zero during isolated operation, step S601 is repeated；
When fault element recovery time etr is zero during S605, isolated operation, then the isolated island internal loading containing distributed generation resource is cut down
Judgement terminates.
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| CN106340883A (en) * | 2016-09-07 | 2017-01-18 | 中国农业大学 | Load reduction method under power distribution network island operation mode and system |
-
2019
- 2019-07-18 CN CN201910650914.5A patent/CN110247403A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103473446A (en) * | 2013-08-29 | 2013-12-25 | 国家电网公司 | Load reduction model for assessing reliability of active power distribution network and implementation method thereof |
| CN104682398A (en) * | 2015-03-26 | 2015-06-03 | 中国电力工程顾问集团西南电力设计院有限公司 | Load reduction method for realizing power supply reliability of independent micronet power supply system |
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