CN107516904A - A kind of reply power supply off-grid impacts and counted and the accurate duty control method of unit regulating power - Google Patents
A kind of reply power supply off-grid impacts and counted and the accurate duty control method of unit regulating power Download PDFInfo
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- CN107516904A CN107516904A CN201710776182.5A CN201710776182A CN107516904A CN 107516904 A CN107516904 A CN 107516904A CN 201710776182 A CN201710776182 A CN 201710776182A CN 107516904 A CN107516904 A CN 107516904A
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- power
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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
- 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
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
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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
- H02J3/38—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
Abstract
Impact and count and the accurate duty control method of unit regulating power the invention discloses a kind of reply power supply off-grid, belong to Power System and its Automation technical field.The inventive method is on the premise of fully calculating certain areas power network or large factories and mines enterprises provide operation of power networks unit regulating power for oneself, judged whether that emergent control measure need to be taken according to unit loss amount, and cutting load object is precisely selected according to load operation power when needed.This invention ensures that safety and stability control device control measure is accurate effective, operational reliability of the power network under failure or particular form is improved, reduces power network decompression risk.
Description
Technical field
The invention belongs to Power System and its Automation technical field, and more precisely, the present invention relates to one kind reply electricity
Source off-grid impacts and counted and the accurate duty control method of unit regulating power.
Background technology
At present, certain areas power network or large factories and mines enterprises provide power network for oneself, and its grid structure is relatively weak, unit in net
Spare capacity is relatively low, although can be incorporated into the power networks with outside major network, there is also after failure or isolated power grid side in particular cases
Formula.
Therefore, for it is above-mentioned provide power network for oneself for, because regulating power is weaker under isolated power grid mode, occur in net
The active power shortage impact of Large Copacity is will appear from after unit off-grid failure, power network is even resulted in and the consequence of dead electricity occurs.It is and electric
Once net long period dead electricity, equipment will be unable to normal work, cause Partial key equipment permanent damage, or even cause great
Security incident and huge economic losses.
In order to solve this problem, failure connection cutting load is carried out using safety and stability control device more, this is to ensure that power network
The important means of safe and stable operation after failure.But join cutting load technology according to existing security and stability control, according to loss machine
Group amount takes equivalent cutting load control measure, when the active granularity of net internal loading is larger, by due to the discreteness of control measure
It is higher, do not consider the factors such as operating unit regulating power, cause power network safety operation ability after failure to reduce, or even can not
Meet control strategy convergent requirement.
The content of the invention
The present invention seeks to：In order to overcome the equivalent cutting load control measure taken in the prior art according to loss unit amount
Possibly the problem of control strategy convergent requirement can not be met, propose that a kind of reply power supply off-grid impacts and counted and unit regulating power
Accurate duty control method, so as on the premise of abundant zoning operation of power networks unit regulating power, pass through essence
Quasi- selection cutting load object, it is ensured that the control measure accurate and effective of safety and stability control device, ensure regional power grid after a failure
Safe and stable operation.
Specifically, the present invention specifically uses following technical scheme, specifically includes following steps：
1) in real time in measured zone power network every generating set operation active-power Pg_i, and according to the fortune of generating set
Row operating mode counts the maximum operation power P of every generating setmax_i, minimum operation power Pmin_iAnd nominal operation power
Prated_i, the i in subscript represents the sequence number of each generating set, then calculates the active ability P of lifting of every generatorup_iWith return
Active ability P dropsdown_i；
2) during regional power grid isolated power grid, generating set off-grid failure occurs if detected, calculates active power shortage
Plack, PlackValue be equal to fault generator group operation power and, and calculate the remaining operation in addition to fault generator group and generate electricity
The active total capacity P of lifting of unitup_allAnd return the active total capacity P of dropdown_all；
3) judge whether to need to take cutting load control measure, then enter step 4) in this way, otherwise terminate this method；
4) the cutting load combination that satisfaction requires is judged whether, as terminated this method without if, if any then for meeting to want
The cutting load combination asked, select the load combination excision of load and active vacancy difference minimum.
Above-mentioned technical proposal is further characterized by, and in the step 1), does not allow each generating of regulation for power
Unit is lifted active ability Pup_iActive ability P drops with returningdown_i0 is set to, for running active-power Pg_iIt is not less than
Maximum operation power Pmax_iEach generating set lifted active ability Pup_i0 is set to, for running active-power Pg_iLess
Power P is run in minimummin_iEach generating set active ability P is dropped into its timedown_i0 is set to, is such as not belonging to the above situation, then
If the active ability P of the lifting of each generating setup_i=min ((Pmax_i-Pg_i),Prated_i* n%), return the active ability P of dropdown_i
=min ((Pg_i-Pmin_i),Prated_i* m%), n% is that generating set primary frequency regulation maximum can lift rated power percentage,
M% is that generating set primary frequency regulation maximum can return drop rated power percentage.
Above-mentioned technical proposal is further characterized by, in the step 3), if active power shortage Plack≤ residue fortune
The active total capacity of lifting of row unit, then need not take cutting load control measure；Otherwise, step 4) need to be entered and carries out cutting load group
Selection is closed to judge.
Above-mentioned technical proposal is further characterized by, and in the step 4), the cutting load for meeting to require, which combines, is
Finger meets condition (Plack-Pup_all)≤Pl_all≤(Plack+Pdown_all) cutting load combination, wherein Pl_allFor load combination
Power and.
Above-mentioned technical proposal is further characterized by, in the step 4), if load has different priority, by excellent
First level is grouped to load, the combination of prioritizing selection priority level highest load, is selected in the priority limit of selection
Pl_allAnd PlackThe minimum load combination excision of difference, if the load for meeting to require is not present in the priority limit of selection
Combination, then progressively lower priority, and load combination to be cut off is found in the range of next stage priority, is met until choosing
It is required that load combination.
Beneficial effects of the present invention are as follows：For the present invention according to the characteristics of power network isolated power grid mode, proposing and realize should
Power supply off-grid is impacted and counted and the accurate duty control method of unit regulating power, when area power grid or large factories and mines enterprises
Provide power network for oneself and issue life group off-grid failure in isolated power grid mode, it is active by calculating active loss amount, remaining operating unit
Regulating power and each cutting load combination of statistics, precisely choosing, which is cut, meets control strategy requirement and the active difference of off-grid unit surplus
In the range of the remaining active regulating power of operating unit and load combination that difference is minimum, and can preferentially it be selected according to the significance level of load
The relatively low load combination of importance is selected as excision object.This invention ensures that safety and stability control device control measure is accurate
Effectively, operational reliability of the power network under failure or particular form is improved, reduces power network decompression risk, there is significant warp
Ji and social benefit.
Brief description of the drawings
Fig. 1 is the flow chart of the inventive method.
Fig. 2 is the active regulating power statistical flowsheet figure of operating unit of the inventive method.
Fig. 3 is selection control measure flow chart after the unit off-grid failure of the inventive method.
Embodiment
The present invention is described in further detail with reference to the accompanying drawings and examples.
Embodiment 1：
The present embodiment impacts and counted and the accurate duty control method of unit regulating power for a kind of reply power supply off-grid, its
Key step is as shown in Figure 1.
Step 1 describes in Fig. 1, and the lifting of operation generating set is functional in measurement in real time and zoning power network
Power, the active ability of drop is returned, detailed process is as shown in Fig. 2 be the operation of every generating set in measured zone power network real-time first
Active-power Pg_i, and every the maximum of generating set is counted according to the operating condition of generating set and runs power Pmax_i, minimum fortune
Row power Pmin_iAnd nominal operation power Prated_i, the i in subscript represents the sequence number of each generating set, then calculates every generating
The active ability of lifting (represent can the hoisting power upper limit) of machine and the active ability of drop (representative, which can return, drops the upper limit of the power) is returned, wherein right
Each generating set for not allowing regulation in power is lifted active ability Pup_iActive ability P drops with returningdown_iIt is set to 0, it is right
In operation active-power Pg_iPower P is run not less than maximummax_iEach generating set lifted active ability Pup_iIt is set to 0,
For running active-power Pg_iPower P is run no more than minimummin_iEach generating set active ability P is dropped into its timedown_iIf
For 0, the above situation is such as not belonging to, then sets the active ability P of lifting of each generating setup_i=min ((Pmax_i-Pg_i),Prated_i*
N% the active ability P of drop), is returneddown_i=min ((Pg_i-Pmin_i),Prated_i* m%), n% is that generating set primary frequency regulation is maximum
Rated power percentage can be lifted, m% is that generating set primary frequency regulation maximum can return drop rated power percentage.
Step 2 describes in Fig. 1, and during regional power grid isolated power grid, generating set off-grid failure occurs if detected,
Calculate active power shortage Plack, PlackValue be equal to fault generator group operation power and, and calculate except fault generator group it
The active total capacity P of lifting of outer remaining operation generating setup_all=Σ Pup_i, return the active total capacity P of dropdown_all=Σ
Pdown_i, the Pup_allAnd Pdown_allRepresent the regulating power of remaining operation generating set.
Step 3 describes in Fig. 1, judges active power shortage PlackWhether remaining operation generating set is less than or equal to
Lift active total capacity Pup_all, cutting load control measure need not be then taken in this way；Otherwise, step 4 need to be entered and carries out cutting load group
Selection is closed to judge.
Step 4 describes in Fig. 1, judges whether to meet desired cutting load combination, as terminated this method without if,
If any then being combined for the cutting load for meeting to require, the load combination excision of load and active vacancy difference minimum is selected.Institute
Meaning meets requirement, and the load combination for referring to choose need to meet that control condition requires (Plack-Pup_all)≤Pl_all≤(Plack+
Pdown_all), wherein Pl_allBe load combination power and, so-called load and active vacancy difference minimum just refer to Pl_allWith
PlackDifference it is minimum, detailed process is as shown in Figure 3.
As load has different important levels, can be selected to set priority according to the important level of load, by preferential
Level is grouped to load, the combination of prioritizing selection priority level highest load, load is selected in the priority limit of selection
Measure (Pl_all) and active vacancy PlackThe minimum load combination excision of difference, if be not present in the priority limit of selection full
The load combination required enough, then progressively lower priority, and load combination to be cut off is found in the range of next stage priority,
Until choosing the load combination for meeting to require.For example, be limit priority with 1, following priority is respectively 2,3 ..., k, then
Prioritizing selection priority level is that 1 load is combined, if the unselected combination for meeting to require, chooses priority level successively
1~2,1~3 ..., 1~k ... load be combined and judged, until choosing the load combination for meeting to require.
Although the present invention is disclosed as above with preferred embodiment, embodiment is not for limiting the present invention's.Not
In the spirit and scope for departing from the present invention, any equivalence changes done or retouching, the protection domain of the present invention is also belonged to.Cause
This protection scope of the present invention should be using the content that claims hereof is defined as standard.
Claims (5)
1. a kind of reply power supply off-grid impact and counted and the accurate duty control method of unit regulating power, it is characterised in that wraps
Include the following steps：
1) in real time in measured zone power network every generating set operation active-power Pg_i, and according to the operation work of generating set
Condition counts the maximum operation power P of every generating setmax_i, minimum operation power Pmin_iAnd nominal operation power Prated_i, under
I in mark represents the sequence number of each generating set, then calculates the active ability P of lifting of every generatorup_iDrop is functional with returning
Power Pdown_i；
2) during regional power grid isolated power grid, generating set off-grid failure occurs if detected, calculates active power shortage Plack,
PlackValue be equal to fault generator group operation power and, and calculate the remaining operation generating set in addition to fault generator group
The active total capacity P of liftingup_allAnd return the active total capacity P of dropdown_all；
3) judge whether to need to take cutting load control measure, then enter step 4) in this way, otherwise terminate this method；
4) judge whether to meet desired cutting load combination, as terminated this method without if, if any then for meeting what is required
Cutting load combines, and selects the load combination excision of load and active vacancy difference minimum.
2. reply power supply off-grid according to claim 1 impacts and counted and the accurate spatial load forecasting side of unit regulating power
Method, it is characterised in that in the step 1), do not allow each generating set of regulation to be lifted active ability P for powerup_i
Active ability P drops with returningdown_i0 is set to, for running active-power Pg_iPower P is run not less than maximummax_iEach generating
Unit is lifted active ability Pup_i0 is set to, for running active-power Pg_iPower P is run no more than minimummin_iEach hair
Its time is dropped active ability P by group of motorsdown_i0 is set to, is such as not belonging to the above situation, then the lifting for setting each generating set is functional
Power Pup_i=min ((Pmax_i-Pg_i),Prated_i* n%), return the active ability P of dropdown_i=min ((Pg_i-Pmin_i),Prated_i*
M%), n% is that generating set primary frequency regulation maximum can lift rated power percentage, and m% is that generating set primary frequency regulation is maximum
Drop rated power percentage can be returned.
3. reply power supply off-grid according to claim 1 impacts and counted and the accurate spatial load forecasting side of unit regulating power
Method, it is characterised in that in the step 3), if active power shortage PlackThe active total capacity of lifting of≤remaining operating unit,
Cutting load control measure need not then be taken；Otherwise, step 4) need to be entered and carry out cutting load combination selection judgement.
4. reply power supply off-grid according to claim 1 impacts and counted and the accurate spatial load forecasting side of unit regulating power
Method, it is characterised in that in the step 4), the cutting load combination for meeting to require refers to meet condition (Plack-Pup_all)≤
Pl_all≤(Plack+Pdown_all) cutting load combination, wherein Pl_allFor load combination power and.
5. reply power supply off-grid according to claim 4 impacts and counted and the accurate spatial load forecasting side of unit regulating power
Method, it is characterised in that in the step 4), if load has different priority, be according to priority grouped to load, preferentially
The combination of priority level highest load is selected, P is selected in the priority limit of selectionl_allAnd PlackThe minimum load group of difference
Excision is closed, if the load combination for meeting to require is not present in the priority limit of selection, priority is progressively lowered, under
Load combination to be cut off is found in the range of one-level priority, until choosing the load combination for meeting to require.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710776182.5A CN107516904B (en) | 2017-08-31 | 2017-08-31 | Accurate load control method for coping with power supply off-line impact and considering unit adjusting capacity |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710776182.5A CN107516904B (en) | 2017-08-31 | 2017-08-31 | Accurate load control method for coping with power supply off-line impact and considering unit adjusting capacity |
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| Publication Number | Publication Date |
|---|---|
| CN107516904A true CN107516904A (en) | 2017-12-26 |
| CN107516904B CN107516904B (en) | 2020-05-15 |
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| CN201710776182.5A Active CN107516904B (en) | 2017-08-31 | 2017-08-31 | Accurate load control method for coping with power supply off-line impact and considering unit adjusting capacity |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108521129A (en) * | 2018-04-23 | 2018-09-11 | 南京南瑞继保电气有限公司 | Micro-capacitance sensor off-load method, apparatus, system and storage medium |
| CN108631322A (en) * | 2018-05-23 | 2018-10-09 | 辛集市澳森钢铁有限公司 | Electrical load selectivity off-grid system and method |
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| CN101789608A (en) * | 2010-03-31 | 2010-07-28 | 德阳瑞能电力科技有限公司 | Isolated power grid multi-unit parallel load distribution control system |
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| CN107516904B (en) | 2020-05-15 |
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