CN106786573A - Power network side-by-side cross-section asynchronous oscillation method of discrimination based on multi-measuring point comprehensive criterion - Google Patents
Power network side-by-side cross-section asynchronous oscillation method of discrimination based on multi-measuring point comprehensive criterion Download PDFInfo
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- CN106786573A CN106786573A CN201710203396.3A CN201710203396A CN106786573A CN 106786573 A CN106786573 A CN 106786573A CN 201710203396 A CN201710203396 A CN 201710203396A CN 106786573 A CN106786573 A CN 106786573A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
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- 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
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
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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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Abstract
This application discloses a kind of power network side-by-side cross-section asynchronous oscillation method of discrimination based on multi-measuring point comprehensive criterion, methods described includes：Power network side-by-side cross-section is chosen, the power network side-by-side cross-section is divided into M passage；Monitoring point is respectively provided with the both sides of each passage, is utilizedStep-out criterion carries out step-out judgement to each monitoring point；When the monitoring point of the passage both sides occurs asynchronous oscillation, then judge that the passage occurs asynchronous oscillation；The quantity for counting the M passage generation asynchronous oscillation in the power network side-by-side cross-section is m, when m is more than or equal to number of channels threshold value MsetWhen, then judge that the power network side-by-side cross-section occurs asynchronous oscillation；Wherein, Mset≤M.The power network side-by-side cross-section asynchronous oscillation method of discrimination based on multi-measuring point comprehensive criterion that the application is provided, reduces the risk of mistake differentiation, and has good applicability to all kinds of complicated side-by-side cross-sections.
Description
Technical field
The application is related to Power System Planning comprehensively to sentence based on multi-measuring point with operation control technology field, more particularly to one kind
According to power network side-by-side cross-section asynchronous oscillation method of discrimination.
Background technology
With the continuous expansion of interconnected electric power system scale, asynchronous oscillation odds is continuously increased.As power train
Unite the important component (preceding twice defence line be relay protection and automatic safety device) of three lines of defence, Out-of-Step Splitting Systems criterion pair
In system asynchronous oscillation identification and preventing accident from spreading causes massive blackout most important.Seriously done in power system
Disturb, when the globality of power network cannot keep, disconnection device carries out off-the-line and can avoid power network total collapse to bulk power grid, it is ensured that weight
Want the continued power of load.
Power system occur asynchronous oscillation when necessarily have an oscillation center, when both end voltage phase difference from initial value progressively
180 degree is increased over, shows power network step-out, and oscillation center is located between the bus of both sides.Oscillation center side
Coherent Generator Group frequency is higher than average frequency, and the frequency of other side Coherent Generator Group is less than average frequency, if it is assumed that both sides are equivalent
The potential approximately equal of unit, then the position of oscillation center is near the midpoint of system impedance.Grasp the specific of oscillation center
Position pair determines that the asynchronous oscillation pattern of system, selection splitting point are most important.
Out-of-Step Splitting Systems criterion claimed apparatus are failure to actuate when system is normally run, and reliably to be started in system step-out.
At present, the Out-of-Step Splitting Systems device of power network judges asynchronous oscillation using single criterion on the spot, such as：Impedance principle is using survey in proper order
Amount locus of impedance wears zone properties to judge asynchronous oscillation；Phase angle principle is sentenced using electric current with the variation characteristic of voltage angle
Disconnected asynchronous oscillation.But continuing to develop and strengthen with rack, asynchronous oscillation is typically occurred in by multi circuit transmission lines or multichannel structure
Into side-by-side cross-section on, existing step-out criterion single on the spot mostly be directed to equivalent two machines system, for 3 or 3 may be divided into
The asynchronous oscillation of an equivalent group of planes more than individual, it is impossible to which the step-out for meeting whole side-by-side cross-section judges, by dispersion Out-of-Step Splitting Systems on the spot
Criterion carries out off-the-line, the increased risk of its malfunction.For the off-the-line operation of power network complexity side-by-side cross-section, if only relying on dispersion step-out
The criterion on the spot of disconnection device, then the cooperation of many set disconnection devices is difficult, it is impossible to ensure in synchronization that side-by-side cross-section is complete
Off-the-line, the risk for having fault spread；On the other hand, when side-by-side cross-section occurs step-out, the step-out of different and column line or passage
The moment that oscillation characteristicses occur does not ensure that completely the same, and single step-out criterion can only monitor a certain circuit or a certain on the spot
The step-out of passage, if now each implementing off-the-line by scattered Out-of-Step Splitting Systems device, can cause can under unordered off-the-line, serious conditions
Whole section can be caused cannot be untied completely.
The content of the invention
This application provides a kind of power network side-by-side cross-section asynchronous oscillation method of discrimination based on multi-measuring point comprehensive criterion, to solve
Certainly the step-out of side-by-side cross-section judge and step-out after harmonious off-the-line problem.
It is described this application provides a kind of power network side-by-side cross-section asynchronous oscillation method of discrimination based on multi-measuring point comprehensive criterion
Method includes：
Power network side-by-side cross-section is chosen, the power network side-by-side cross-section is divided into M passage；
Monitoring point is respectively provided with the both sides of each passage, is utilizedStep-out criterion is clicked through to each monitoring
Row step-out judges；
When the monitoring point of the passage both sides occurs asynchronous oscillation, then judge that the passage occurs asynchronous oscillation；
The quantity for counting the M passage generation asynchronous oscillation in the power network side-by-side cross-section is m, when m is more than or equal to logical
Road quantity threshold value MsetWhen, then judge that the power network side-by-side cross-section occurs asynchronous oscillation；
Wherein, Mset≤M。
Optionally, in the above method, the utilizationStep-out criterion carries out step-out judgement to each monitoring point, specifically
For：
According toStep-out criterion, calculates the monitoring pointValue, whenOnce week is completed in (- 1,1)
When phase changes, 1 mechanical periodicity, statistics are recordedMechanical periodicity number of times；
When mechanical periodicity number of times is more than threshold definite value Nset, and NsetThe minimum voltage of the monitoring point is less than in the individual cycle
Voltage perunit value Uset, then judge that the monitoring point occurs asynchronous oscillation.
Optionally, in the above method, the voltage perunit value UsetIt is 0.6-0.7.
Optionally, in the above method, when M >=3, Mset=M-1；
As M ＜ 3, Mset=M.
The power network side-by-side cross-section asynchronous oscillation method of discrimination based on multi-measuring point comprehensive criterion that the application is proposed, by choosing
Multiple measuring points of side-by-side cross-section interconnector both sides, first withWhether each measuring point of discrimination principles real-time monitoring loses
Step vibration, on the basis of differentiating whether measuring point occurs step-out, further differentiates whether circuit or passage occur step-out, works as generation
When step-out circuit or number of active lanes reach setting threshold value, judge whether power network side-by-side cross-section occurs step-out.The present invention utilizes this
Plant by point to line, then by the stratification thinking of line to face, construct the step-out method of discrimination for power network side-by-side cross-section.The side
Method is divided into measuring point, passage, three levels of section from top to bottom by by power network side-by-side cross-section, and carries out comprehensive distinguishing by different level,
Collect the judgement information on the spot of each measuring point, concentration is judged, form mutually verification, make up single measuring point and single criterion
It is not enough, it is ensured that the accuracy of judgement conclusion.
The power network side-by-side cross-section asynchronous oscillation method of discrimination based on multi-measuring point comprehensive criterion that the application is proposed closely is tied
The characteristics of synthesizing ripe reliable step-out criterion and complicated side-by-side cross-section, step-out is constructed by different level and differentiates logic, by multi-measuring point
Multi-level differentiation realizes mutually verification, ultimately forms step-out differentiation, and its reliability criterion more single than single measuring point has substantially
All kinds of complicated side-by-side cross-sections so as to reduce the risk of mistake differentiation, and are had good applicability by lifting.
Brief description of the drawings
In order to illustrate more clearly of the technical scheme of the application, letter will be made to the accompanying drawing to be used needed for embodiment below
Singly introduce, it should be apparent that, for those of ordinary skills, without having to pay creative labor,
Other accompanying drawings can also be obtained according to these accompanying drawings.
The power network side-by-side cross-section asynchronous oscillation differentiation side based on multi-measuring point comprehensive criterion that Fig. 1 is provided for the embodiment of the present application
The flow chart of method；
Fig. 2 layouts schematic diagram for one embodiment that the embodiment of the present application is provided.
Specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present application, the technical scheme in the embodiment of the present application is carried out clear, complete
Whole description, it is clear that described embodiment is only a part of embodiment of the invention, rather than whole embodiments.It is based on
Embodiment in the application, it is every other that those of ordinary skill in the art are obtained under the premise of creative work is not made
Embodiment, belongs to the scope of the application protection.
Fig. 1 is the power network side-by-side cross-section asynchronous oscillation differentiation side based on multi-measuring point comprehensive criterion that the embodiment of the present application is provided
The flow chart of method, flow the step of show the power network side-by-side cross-section asynchronous oscillation method of discrimination based on multi-measuring point comprehensive criterion；
Fig. 2 is that one embodiment that the embodiment of the present application is provided is layouted schematic diagram, there is provided a representative instance.
Referring to Fig. 1, the power network side-by-side cross-section asynchronous oscillation method of discrimination based on multi-measuring point comprehensive criterion is comprised the following steps：
Step S101：Power network side-by-side cross-section is chosen, the power network side-by-side cross-section is divided into M passage.
According to electric network composition, some times interconnectors are defined as complicated side-by-side cross-section, and according to the geography of transmission line of electricity
Line definitions in same transmission of electricity corridor are same passage by position distribution, are led to so as to complicated side-by-side cross-section is divided into M
Road.
Step S102：Monitoring point is respectively provided with the both sides of each passage, is utilizedStep-out criterion is to each
Monitoring point carries out step-out judgement.
Step-out monitoring point is respectively provided with both sides end points (transformer station or power plant) bus of each passage, is utilized
Step-out criterion carries out step-out judgement to each monitoring point,It is the voltage at asynchronous oscillation center, generally by voltmeter, electricity
Flow table, in amplitude U and phase, the amplitude of electric current and phase of the electrical substation monitoring channel voltage of passway for transmitting electricity both sides.Calculate electricity
Press and be with the phase difference of electric currentCalculate againNumerical value,It is exactly the voltage at asynchronous oscillation center.
Specifically, according toStep-out criterion, calculates the monitoring pointValue, whenIt is complete in (- 1,1)
During into a mechanical periodicity, 1 mechanical periodicity, statistics are recordedMechanical periodicity number of times；When mechanical periodicity number of times is more than door
Sill definite value Nset, and NsetThe minimum voltage of the monitoring point is less than voltage perunit value U in the individual cycleset, then the monitoring is judged
There is asynchronous oscillation in point.
Wherein：NsetWhat is represented is the number of times of asynchronous oscillation, and theoretically analysis is worked asCalculated value is interval in (- 1,1)
When 1 second periodicity of interior completion changes, you can to confirm that the side system of asynchronous oscillation center two occurs 1 asynchronous oscillation.In engineering reality
Generally for the accuracy for judging, it is necessary to repeatedly confirmed to asynchronous oscillation in the application of border, therefore NsetIt is typically set to 2, i.e. table
Show and work asWhen step-out criterion judges 2 asynchronous oscillations, just confirm asynchronous oscillation.UsetIt is monitoring point in NsetIt is individual
The perunit value of the minimum voltage in the asynchronous oscillation cycle, perunit value=famous value/a reference value, famous value is the real-time inspection of monitoring point
Measured value, a reference value is the rated voltage of monitoring point, and minimum voltage is lower to show that the measuring point is nearer apart from asynchronous oscillation center, that is, mark
One value UsetIt is smaller.Particularly, when asynchronous oscillation center overlaps with point position, the monitoring point is in an asynchronous oscillation cycle
Interior minimum voltage is 0, perunit value UsetIt is 0.To ensure the accuracy that network system safety and asynchronous oscillation judge, perunit
Value UsetIt is usually arranged as 0.6-0.7, i.e. perunit value UsetIt is the arbitrary value between 0.6-0.7, represents that measuring point shakes in a step-out
When swinging the arbitrary value that the minimum voltage in the cycle need to be less than in 60%-70% rated voltages, just think step-out near measuring point
Vibration.
Step S103：When the monitoring point of the passage both sides occurs asynchronous oscillation, then judge that the passage loses
Step vibration.
Monitoring point to the both sides of each passage carries out asynchronous oscillation judgement, when the monitoring point of the both sides of passage occurs
Asynchronous oscillation, just judges that the passage occurs asynchronous oscillation.When the measuring point of both sides is judged to asynchronous oscillation, the passage is just thought
Generation step-out, can so prevent the mistake differentiation of single measuring point, form mutually verification.
Step S104：The quantity for counting the M passage generation asynchronous oscillation in the power network side-by-side cross-section is m, when m is more than
Or equal to number of channels threshold value MsetWhen, then judge that the power network side-by-side cross-section occurs asynchronous oscillation.
Asynchronous oscillation judgement is carried out to each passage according to above-mentioned steps, M in the power network side-by-side cross-section is counted
There is the quantity of asynchronous oscillation in passage, be designated as m, the number of channels m and number of channels threshold value M of asynchronous oscillation will occursetCarry out
Compare, as m >=MsetWhen, judge that the power network side-by-side cross-section occurs asynchronous oscillation.
If side-by-side cross-section is made up of M passage, then most stringent of consideration should set Mset=M, i.e., and if only if institute
There is passage to sentence and just think when step-out section generation step-out, but when the port number for constituting section is more, have respective channel
Step-out feature it is not fairly obvious, now lead to not sentence to prevent criterion excessively strict and section step-out, can set
MsetEqual to M-1.It is contemplated that when section channel sum is more than or equal to 3 according to actual engineering experience and be configured by this principle,
I.e. when M >=3, Mset=M-1；As M ＜ 3, Mset=M.
The power network side-by-side cross-section asynchronous oscillation method of discrimination based on multi-measuring point comprehensive criterion that the application is proposed, by choosing
Multiple measuring points of side-by-side cross-section interconnector both sides, first withWhether each measuring point of discrimination principles real-time monitoring loses
Step vibration, on the basis of differentiating whether measuring point occurs step-out, further differentiates whether circuit or passage occur step-out, works as generation
When step-out circuit or number of active lanes reach setting threshold value, judge whether power network side-by-side cross-section occurs step-out.The present invention utilizes this
Plant by point to line, then by the stratification thinking of line to face, construct the step-out method of discrimination for power network side-by-side cross-section.The side
Method is divided into measuring point, passage, three levels of section from top to bottom by by power network side-by-side cross-section, and carries out comprehensive distinguishing by different level,
Collect the judgement information on the spot of each measuring point, concentration is judged, form mutually verification, make up single measuring point and single criterion
It is not enough, it is ensured that the accuracy of judgement conclusion.
The power network side-by-side cross-section asynchronous oscillation method of discrimination based on multi-measuring point comprehensive criterion that the application is proposed closely is tied
The characteristics of synthesizing ripe reliable step-out criterion and complicated side-by-side cross-section, step-out is constructed by different level and differentiates logic, by multi-measuring point
Multi-level differentiation realizes mutually verification, ultimately forms step-out differentiation, and its reliability criterion more single than single measuring point has substantially
All kinds of complicated side-by-side cross-sections so as to reduce the risk of mistake differentiation, and are had good applicability by lifting.
Whether there is the criterion of asynchronous oscillation suitable for monitoring power system complexity side-by-side cross-section present applicant proposes a kind of,
Comprehensive each measuring pointStep-out differentiates that conclusion reflects that oscillation center, in the distribution situation of complicated side-by-side cross-section, is entered by passage
Row step-out differentiates that the differentiation situation of last comprehensive each passage show that final side-by-side cross-section step-out differentiates result, can prevent because
Real system complex structure and the changeable erroneous judgement risk that may be brought of the method for operation, can more accurately judge asynchronous oscillation center
Whether it is located on side-by-side cross-section, and is conducive to harmonious carrying out islanding control, it is ensured that the reliability and validity of off-the-line action.
Monitor measuring point just in each passage both sides that the application is fully utilized in power system complexity side-by-side cross-section first
Ground step-out discriminant information, forms global judged result, the asynchronous oscillation center on side-by-side cross-section is caught with this, base
In valve systems such as the machines of one-terminal data twoCriterion is converted into the comprehensive criterion that may determine that side-by-side cross-section desynchronizing state, makes up
The deficiency of single criterion, correctly can efficiently position section where oscillation center, build for complicated side-by-side cross-section step-out
Off-the-line system.
Referring to accompanying drawing 2, the electricity based on multi-measuring point comprehensive criterion of the application offer is carried out by taking power system in accompanying drawing 2 as an example
Net side-by-side cross-section asynchronous oscillation method of discrimination is specifically described, to facilitate the implementation of the application.
Power train shown in accompanying drawing 2 completely includes power network 1, power network 2, power network 3, power network 4, assert power network 1, power network 2, electricity
Net 3, power network 4 are provincial power network, there is 8 times inter-provincial contacts between 19 plant stands such as including A, B, C, wherein power network 3 and power network 4
Circuit, this 8 times interconnectors constitute complicated side-by-side cross-section, and dotted line is represented in accompanying drawing 2, and this 8 times interconnections feed back electricity by 4
The parallel line composition in corridor, the parallel line in same transmission of electricity corridor has an identical step-out feature, therefore by the power network section
It is divided into 4 passages.Measuring point is set in two side bus of each passage, by taking passage 1 as an example, in the bus of its leftmost side plant stand E
Upper setting measuring point 1-1, can monitor step-out feature in left side, and measuring point 1-2 is set on the bus of its rightmost side plant stand H, can
Step-out feature is monitored with right side, if passage 1 occurs step-out, then step-out all should be determined on the measuring point of both sides, is utilized
The mutual confirmation of both sides measuring point judgement conclusion may insure to differentiate the correctness of conclusion.As shown in Fig. 2 for the power network section
4 passages, can set altogether 8 measuring points (wherein having a test point to repeat).Supervised by the monitoring point in accompanying drawing 2
Survey and differentiate, judge whether above-mentioned 4 passages occur asynchronous oscillation, count the number of channels of asynchronous oscillation.In the passage for swinging
When quantity is 3 or 4, then judge that power network side-by-side cross-section occurs asynchronous oscillation.
Those skilled in the art will readily occur to its of the application after considering specification and putting into practice invention disclosed herein
Its embodiment.The application is intended to any modification of the invention, purposes or adaptations, these modifications, purposes or
Person's adaptations follow general principle of the invention and including undocumented common knowledge in the art of the invention
Or conventional techniques.Description and embodiments are considered only as exemplary, and true scope and spirit of the invention are by following
Claim is pointed out.
It should be appreciated that the application is not limited to the precision architecture for being described above and being shown in the drawings, and
And can without departing from the scope carry out various modifications and changes.Scope of the present application is only limited by appended claim.
Claims (4)
1. a kind of power network side-by-side cross-section asynchronous oscillation method of discrimination based on multi-measuring point comprehensive criterion, it is characterised in that the side
Method includes：
Power network side-by-side cross-section is chosen, the power network side-by-side cross-section is divided into M passage；
Monitoring point is respectively provided with the both sides of each passage, is utilizedStep-out criterion is lost to each monitoring point
Step judges；
When the monitoring point of the passage both sides occurs asynchronous oscillation, then judge that the passage occurs asynchronous oscillation；
The quantity for counting the M passage generation asynchronous oscillation in the power network side-by-side cross-section is m, when m is more than or equal to port number
Amount threshold value MsetWhen, then judge that the power network side-by-side cross-section occurs asynchronous oscillation；
Wherein, Mset≤M。
2. the method for claim 1, it is characterised in that the utilizationStep-out criterion is carried out to each monitoring point
Step-out judgement, specially：
According toStep-out criterion, calculates the monitoring pointValue, whenA cycle change is completed in (- 1,1)
During change, 1 mechanical periodicity, statistics are recordedMechanical periodicity number of times；
When mechanical periodicity number of times is more than threshold definite value Nset, and NsetThe minimum voltage of the monitoring point is less than voltage in the individual cycle
Perunit value Uset, then judge that the monitoring point occurs asynchronous oscillation.
3. method as claimed in claim 2, it is characterised in that the voltage perunit value UsetIt is 0.6-0.7.
4. the method for claim 1, it is characterised in that in methods described,
When M >=3, Mset=M-1；
As M ＜ 3, Mset=M.
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| CN110112746A (en) * | 2019-06-03 | 2019-08-09 | 中国南方电网有限责任公司 | Splitting Control, device, computer equipment and the storage medium of regional power grid |
| CN110492613A (en) * | 2019-08-23 | 2019-11-22 | 中国能源建设集团广东省电力设计研究院有限公司 | A kind of section Out-of-Step Splitting Systems differentiate control system and method |
| CN110518699A (en) * | 2019-08-23 | 2019-11-29 | 中国能源建设集团广东省电力设计研究院有限公司 | Out-of-Step Splitting Systems control system based on Wide-area Measurement Information |
| CN111313414A (en) * | 2020-03-25 | 2020-06-19 | 北京四方继保工程技术有限公司 | Method for judging complex out-of-step section of large power grid |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110112746A (en) * | 2019-06-03 | 2019-08-09 | 中国南方电网有限责任公司 | Splitting Control, device, computer equipment and the storage medium of regional power grid |
| CN110112746B (en) * | 2019-06-03 | 2021-07-20 | 中国南方电网有限责任公司 | Splitting control method and device for regional power grid, computer equipment and storage medium |
| CN110492613A (en) * | 2019-08-23 | 2019-11-22 | 中国能源建设集团广东省电力设计研究院有限公司 | A kind of section Out-of-Step Splitting Systems differentiate control system and method |
| CN110518699A (en) * | 2019-08-23 | 2019-11-29 | 中国能源建设集团广东省电力设计研究院有限公司 | Out-of-Step Splitting Systems control system based on Wide-area Measurement Information |
| CN111313414A (en) * | 2020-03-25 | 2020-06-19 | 北京四方继保工程技术有限公司 | Method for judging complex out-of-step section of large power grid |
| CN111313414B (en) * | 2020-03-25 | 2022-04-19 | 北京四方继保工程技术有限公司 | Method for judging complex out-of-step section of large power grid |
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Application publication date: 20170531 |