CN106611959B - A kind of direct current receiving end AC system voltage stability distinguishing method based on WAMS unusual fluctuations dynamically track - Google Patents
A kind of direct current receiving end AC system voltage stability distinguishing method based on WAMS unusual fluctuations dynamically track Download PDFInfo
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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
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F18/00—Pattern recognition
- G06F18/20—Analysing
- G06F18/23—Clustering techniques
- G06F18/232—Non-hierarchical techniques
- G06F18/2321—Non-hierarchical techniques using statistics or function optimisation, e.g. modelling of probability density functions
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
Abstract
The invention discloses a kind of direct current receiving end AC system voltage stability distinguishing method based on WAMS unusual fluctuations dynamically track, comprising: 1. voltage fluctuation waveforms for extracting recent unusual fluctuations information are counted, and determine the frequent method of operation of voltage dithering；2. the sample of acquisition fluctuation data, attribute are the characteristic attribute under different running method；3. the information of pair acquisition is to clustering: attribute 2- dominant frequency damping ratio, attribute 6- electric voltage exception fluctuating level coefficient；4. using fitness highest information to sample point as first cluster centre；5. a pair above- mentioned information are modified sample point；6. determining all cluster centre point and number of clusters H, and the analysis of flow situations and switch on condition is combined, forms reduction and go out Voltage Stability Level criterion, realize the judgement to direct current receiving end AC system voltage stability.Calculation amount of the present invention is small, is easy to on-line implement, it can be achieved that the quick judgement of direct current receiving end Voltage Instability problem and the reasonable construction of cascading failure collection.
Description
Technical field
The invention belongs to power system security stability analysis technical fields, and in particular to one kind is dynamic based on WAMS unusual fluctuations
The direct current receiving end AC system voltage stability distinguishing method of state tracking.
Background technique
China Power Grids have formed extra-high-voltage alternating current interconnected network at present, pass through high-voltage direct current and major 500 kilovolts friendships
Galvanic electricity net is connected.According to trend, the following 10-20 China will also build tens of times extra-high voltage direct-current engineerings, gradually form extra-high
AC-DC hybrid power grid is pressed, is powered by extra-high voltage direct-current, AC system to central and east load center.Conventional high-voltage dc transmission
Electric system needs receiving end AC system to provide enough commutation voltages, and will also absorb from AC system greatly after commutation failure occurs
Measure idle, receiving end power grid will face serious safety and stability problem after multi-infeed DC.
With the fast development of scheduling controlling technology support system, especially wide area vector measurement system (Wide Area
Measurement System, WAMS) integrated and phasor measurement units (Phase Measure Unit, PMU) gradually optimizations
Arrangement, provides effective complex art means for the security and stability analysis of high voltage direct current receiving end AC system.
For alternating current-direct current mixed connection feed-in receiving end power grid, even more serious safety and stability problem is: the alternating current-direct current that may occur
System cascading failure may cause direct current system and continue commutation failure after fault in ac transmission system, and then lead to direct current locking more
It is high-power to be transferred to communication channel, cause linksystem mains breakdown accident.Current research means are still shown single in response to this problem,
Time-domain simulation method is mainly used in engineering, it is assessed by the transient stability emulation combined to various ac and dc systems failures
Whether can cause direct current system and continue commutation failure, and then cause even more serious cascading failure.In addition, the method is faced with work
Work amount is big, is difficult to the problems such as exhaustive potential faults.In addition, both at home and abroad the formation mechenism of cascading failure and in terms of
Carry out part to study, power flow transfer is assessed, based on the analysis methods such as power grid small world, the company of advancing after proposing failure
Lock the development of fault set constructing technology.But current research lays particular emphasis on theory analysis more or operating experience is summarized, for how to tie
Closing effective practical method that power grid actual conditions propose that cascading failure collection constructs, it is still necessary to further develop.
Therefore, in conjunction with the development reality and future plan of China Power Grids, it would be highly desirable to solve alternating current-direct current mixed connection receiving end power grid cascading
The reasonable of fault set generates the technical problems such as the quick judgement for whether continuing commutation failure with direct current system under cascading failure.
Summary of the invention
It is an object of the invention to overcome the deficiencies of the prior art and provide a kind of based on WAMS unusual fluctuations dynamically track
Direct current receiving end AC system voltage stability distinguishing method, by that may be present temporarily to existing and planning AC-DC hybrid power grid
State Voltage Instability accident carries out signature analysis, using the calculation method and estimation flow of dynamic receiving-end system voltage stability, according to
Effective contingency screen and rank, trend after combination failure are realized according to the extent of injury of the AC fault to direct current system stable operation
Transfer case realizes the reasonable construction of cascading failure collection, can more conveniently to receiving end network voltage unstability risk after failure into
Row quickly determines.
In order to achieve the above-mentioned object of the invention, the present invention takes following technical scheme.
A kind of direct current receiving end AC system voltage stability distinguishing side based on WAMS unusual fluctuations dynamically track of the invention
Method, which is characterized in that the described method comprises the following steps:
Step 1 is based on WAMS system, extracts the voltage fluctuation waveform of recent unusual fluctuations information, counts to it, really
Constant voltage shakes the frequent method of operation；
The sample of step 2, acquisition fluctuation data；The attribute of the collecting sample is the feature category under different running method
Property；
Step 3: to collected information to clustering: attribute 2- dominant frequency damping ratio, attribute 6- electric voltage exception wave
Dynamic horizontal coefficients；
Step 4, using fitness highest information to sample point as first cluster centre；
Step 5 is modified above- mentioned information to sample point；
Step 6 determines all cluster centre point and number of clusters H；And the analysis of flow situations and switch on condition is combined,
It forms reduction and goes out Voltage Stability Level criterion, realize the judgement to direct current receiving end AC system voltage stability.
In the step 1, the voltage fluctuation information in 500 kilovolts and 220 kilovolts regions is extracted；
Region voltage unusual fluctuations horizontal coefficients C=voltage fluctuation bus quantity accounting+λ1Amplitude be averaged fluctuating level+by
Electric ratio+receiving end main force dynamic reactive lays in ratio；Described is referred to by electric ratio: direct current conveys load/local area total load；It is described
Receiving end main force dynamic reactive lay in ratio, refer to: in receiving end AC network in 500 kilovolts of access unit installed capacity/one's respective areas
Load；
Wherein, voltage fluctuation bus quantity accounting be voltage fluctuation quantity be more than threshold alpha bus fluctuate quantity point divided by
All bus total quantitys by PMU system detection in one's respective area；
λ1To think the modulation value set,The electric voltage exception fluctuation amplitude represented in j-th of region is flat
It is horizontal, whereinFor fluctuation amplitude, NJFor the fluctuation quantity in j-th of subregion.
In the step 2, the attribute of the collecting sample is the characteristic attribute under different running method, comprising: is belonged to
Property 1- measured with MW maximum fluctuation record amplitude, attribute 2- maximum fluctuation record amplitude damping percentage, the mono- sky wave of attribute 3-
The bus quantity that dynamic quantity, fluctuation in attribute 4- mono- day occur/total PMU bus monitoring quantity percentage, attribute 5- are measured with MW
Province's net load level, attribute 6- is by the electric voltage exception fluctuating level coefficient obtained of above-mentioned steps 1；
For unusual fluctuations waveform collected, carry out PRONY decomposition, according to analysis, analyze its dominant frequency and its
Corresponding damping ratio, and when step 1 electric voltage exception fluctuating level coefficient obtained is ranked up to damping.
In the step 3, to the information to the detailed process clustered are as follows: by the attribute 2- dominant frequency
Damping ratio, attribute 6- electric voltage exception fluctuating level coefficient are set as the vector of corresponding n*2, and any row indicates an information pair；If
ykFor the sample point of kth ((k=1~n)) a information pair, then its probability for becoming cluster centre point are as follows:
In formula: r is a normal number, is adjusted by experience；N is sample number；PkIndicate sample point ykWith other scheme samples
The how far of point, i.e. fitness of the scheme sample point as cluster centre point, PkIt will increase with r and exponential damping trend is presented.
Other scheme sample points refer to other samples in this cluster sample populations.
The detailed process of the step 4-5 is respectively as follows:
Step 4: using fitness highest information to sample point as first cluster centre, ifFor in first cluster
The heart, P1 *For the fitness of first cluster centre point, then remaining n-1 sample point is public as the amendment of scheme sample point fitness
Formula is；
In formula: effective radius β normal number；For sample point xk(k=1,2 ..., n-1) as the initial of cluster centre
Fitness；For through the revised new fitness of formula (2)；
Step 5: above- mentioned information being modified sample point with above-mentioned formula (2), to eliminateInfluence；It selects again
Take the maximum sample point of current fitness as in second clusterAnd so on, it iterates until there is j-th of cluster
Center, until makingUntil；Wherein,For the fitness of j-th of cluster centre, coefficient θ will affect cluster centre point
Quantity, the i.e. numerical value of H.
In the step 6, the determination all cluster centre point and number of clusters H refer to:
The correspondence attribute value of foundation cluster centre and the whole network minimum voltage of corresponding D.C. high voltage transmission bipolar locking emulation,
The gear carried out between cluster centre divides, and the whole network minimum voltage value according to the emulation of D.C. high voltage transmission bipolar locking is big
It is small that danger classes is ranked up, an AC network method of operation danger classes decision table is formed, respective notch: grade is constituted
1, grade 2, grade 3, grade h ..., grade H.
Compared with prior art, the advantages of the present invention include:
The present invention, can by the assessment to Voltage Stability Level evaluation index after receiving end fault in ac transmission system after different faults
To realize that AC network single failure sorts；Power flow transfer is assessed after combination failure on this basis, can be with rapid build more
Reasonably, meet the actual cascading failure collection of power grid, determine that it causes the wind that alternating current-direct current mixed connection direct current system continues commutation failure
Danger.Compared with art methods, calculation amount of the present invention is small, explicit physical meaning, is easy to on-line implement, it can be achieved that direct current continues
The quick judgement of commutation failure risk, that is, direct current receiving end Voltage Instability problem, and can realize the reasonable construction of cascading failure collection.
Detailed description of the invention
Fig. 1 is the direct current receiving end AC system voltage stability distinguishing method the present invention is based on WAMS unusual fluctuations dynamically track
A kind of embodiment method flow diagram.
Fig. 2 is a kind of AC-DC hybrid power grid structural schematic diagram of embodiment of the invention.
Fig. 3 is that rear portion denominator line voltage recovery curve figure occurs for cascading failure in a kind of embodiment of the invention.
Fig. 4 be in a kind of embodiment of the invention cascading failure occur after certain high-voltage d. c inverse transform side blow-out angular curve figure.
Specific embodiment
The present invention is described in further detail below in conjunction with the accompanying drawings.
Fig. 1 is the direct current receiving end AC system voltage stability distinguishing method the present invention is based on WAMS unusual fluctuations dynamically track
A kind of embodiment method flow diagram.As shown in Figure 1, the embodiment method the following steps are included:
Step 1 is based on WAMS system, extracts the voltage fluctuation waveform of recent unusual fluctuations information, counts to it, really
Constant voltage shakes the frequent method of operation；
The sample of step 2, acquisition fluctuation data；The attribute of the collecting sample is the feature category under different running method
Property；
Step 3: to collected information to clustering: attribute 2- dominant frequency damping ratio, attribute 6- electric voltage exception wave
Dynamic horizontal coefficients；
Step 4, using fitness highest information to sample point as first cluster centre；
Step 5 is modified above- mentioned information to sample point；
Step 6 determines all cluster centre point and number of clusters H；And the analysis of flow situations and switch on condition is combined,
It forms reduction and goes out Voltage Stability Level criterion, realize the judgement to direct current receiving end AC system voltage stability.
In the step 1, the voltage fluctuation information in 500 kilovolts and 220 kilovolts regions is extracted；
Region voltage unusual fluctuations horizontal coefficients C=voltage fluctuation bus quantity accounting+λ1Amplitude be averaged fluctuating level+by
Electric ratio+receiving end main force dynamic reactive lays in ratio；Described is referred to by electric ratio: direct current conveys load/local area total load；It is described
Receiving end main force dynamic reactive lay in ratio, refer to: in receiving end AC network in 500 kilovolts of access unit installed capacity/one's respective areas
Load；
Wherein, voltage fluctuation bus quantity accounting be voltage fluctuation quantity be more than threshold alpha bus fluctuate quantity point divided by
All bus total quantitys by PMU system detection in one's respective area；
λ1To think the modulation value set,The electric voltage exception fluctuation amplitude represented in j-th of region is flat
It is horizontal, whereinFor fluctuation amplitude, NJFor the fluctuation quantity in j-th of subregion.
In the step 2, the attribute of the collecting sample is the characteristic attribute under different running method, comprising: is belonged to
Property 1- measured with MW maximum fluctuation record amplitude, attribute 2- maximum fluctuation record amplitude damping percentage, the mono- sky wave of attribute 3-
The bus quantity that dynamic quantity, fluctuation in attribute 4- mono- day occur/total PMU bus monitoring quantity percentage, attribute 5- are measured with MW
Province's net load level, attribute 6- is by the electric voltage exception fluctuating level coefficient obtained of above-mentioned steps 1；
For unusual fluctuations waveform collected, carry out PRONY decomposition, according to analysis, analyze its dominant frequency and its
Corresponding damping ratio, and when step 1 electric voltage exception fluctuating level coefficient obtained is ranked up to damping.
In the step 3, to the information to the detailed process clustered are as follows: by the attribute 2- dominant frequency
Damping ratio, attribute 6- electric voltage exception fluctuating level coefficient are set as the vector of corresponding n*2, and any row indicates an information pair；If
ykFor the sample point of kth ((k=1~n)) a information pair, then its probability for becoming cluster centre point are as follows:
In formula: r is a normal number, is adjusted by experience；N is sample number；PkIndicate sample point ykWith other scheme samples
The how far of point, i.e. fitness of the scheme sample point as cluster centre point, PkIt will increase with r and exponential damping trend is presented.
Scheme sample point, i.e. one sample sequence of a scheme, therefore referred to as scheme sample.Because inventive algorithm is poly-
The research field of space-like, therefore sample sequence is referred to as scheme sample point in Cluster space.So other scheme samples
Point, can be depending on other samples for being interpreted as in this this cluster sample populations.
The detailed process of the step 4-5 is respectively as follows:
Step 4: using fitness highest information to sample point as first cluster centre, ifFor in first cluster
The heart, P1 *For the fitness of first cluster centre point, then remaining n-1 sample point is public as the amendment of scheme sample point fitness
Formula is；
In formula: effective radius β normal number；For sample point xk(k=1,2 ..., n-1) as the initial of cluster centre
Fitness；For through the revised new fitness of formula (2)；
Step 5: above- mentioned information being modified sample point with above-mentioned formula (2), to eliminateInfluence；It selects again
Take the maximum sample point of current fitness as in second clusterAnd so on, it iterates until there is j-th of cluster
Center, until makingUntil；Wherein,For the fitness of j-th of cluster centre, coefficient θ will affect cluster centre point
Quantity, the i.e. numerical value of H.
In the step 6, the determination all cluster centre point and number of clusters H refer to:
The correspondence attribute value of foundation cluster centre and the whole network minimum voltage of corresponding D.C. high voltage transmission bipolar locking emulation,
The gear carried out between cluster centre divides, and the whole network minimum voltage value according to the emulation of D.C. high voltage transmission bipolar locking is big
It is small that danger classes is ranked up, an AC network method of operation danger classes decision table is formed, respective notch: grade is constituted
1, grade 2, grade 3, grade h ..., grade H.
Fig. 2 is a kind of AC-DC hybrid power grid structural schematic diagram of embodiment of the invention, and AC-DC hybrid power grid is close
Area's voltage evaluation deterministic process is described as follows:
A, by taking certain big regional power grid high voltage direct current receiving end near region as an example, power grid normal operating mode arranges as follows: around height
Straightening stream feed-in, the station 500kV E, the station F, three stations of the station C form alternating current-direct current feed-in receiving end power grid, pass through the station 500kV E converter station-G
Standing, the station-F is changed at double back, the station E, the station F station-G, E station-E stand southern double back, the station E station-I, the station E station-D, the station C station-D, the station B station-A double back, B
The station-E of standing changes double-circuit line and is connected with major network, is accounted for local load about 51% by electric power outside the direct current receiving end near region.Under which,
The station 500kV F, the station E, the station C busbar voltage are respectively 503.2,502.0,495.6kV.
The direct current receiving end near region 220kV busbar voltage operates between 198~216kV, and voltage level is lower；The direct current by
Access 220kV power grid unit in end near region has reached the idle upper limit substantially, and no dynamic is spare.
B, following formula described in above-mentioned steps 1 according to the present invention, the Voltage Stability Level coefficient in zoning:
Region voltage unusual fluctuations horizontal coefficients C=voltage fluctuation bus quantity accounting+λ1Amplitude be averaged fluctuating level+by
Electric ratio+receiving end main force dynamic reactive lays in ratio
Wherein, referred to by electric ratio: direct current conveys load/local area total load；The receiving end main force dynamic reactive deposit
Than referring to: 500 kilovolts of access unit installed capacity/one's respective area internal loadings in receiving end AC network；
Voltage fluctuation bus quantity accounting are as follows: voltage fluctuation quantity is more than the bus fluctuation quantity point of threshold alpha divided by local area
All bus total quantitys by PMU system detection in domain；
λ1To think the modulation value set,The electric voltage exception fluctuation amplitude represented in j-th of region is flat
It is horizontal, whereinFor fluctuation amplitude, NJFor the fluctuation quantity in j-th of subregion.
Show that the Voltage Stability Level coefficient table in region is detailed in the following table 1 as a result,.
Voltage Stability Level coefficient table in 1. region of table
C, as listed by the following table 2, the sample of acquisition fluctuation data.The attribute of institute's collecting sample is the spy under different running method
Levy attribute.
Table 2. fluctuates dominant frequency table according to PMU monitoring bus
D, to collected information to (dominant frequency damping ratio (attribute 2), electric voltage exception fluctuating level coefficient (attribute 6))
It is clustered.It is set as the vector of corresponding n*2, any row indicates an information to (dominant frequency damping ratio, electric voltage exception fluctuate
Horizontal coefficients).
E, using fitness highest information to sample point as first cluster centre, ifFor first cluster centre, P1 *
For the fitness of first cluster centre point, remaining n-1 sample point is as the correction formula of scheme sample point fitness
In formula: effective radius β normal number；For sample point xk(k=1,2 ..., n-1) as the initial of cluster centre
Fitness；To pass through formula (2) revised new fitness.
F, above- mentioned information are modified sample point with formula (3), eliminateInfluence, then choose current fitness most
Big sample point is as in second clusterAnd so on, it iterates until there is j-th of cluster centre, makesUntil, whereinFor the fitness of j-th of cluster centre, coefficient θ will affect the quantity of cluster centre point, i.e. H's
Numerical value.
G, all cluster centre point and number of clusters H=2 are thereby determined that.And according to the correspondence attribute value of cluster centre and
The whole network minimum voltage of corresponding D.C. high voltage transmission bipolar locking emulation, the gear carried out between cluster centre divides, and foundation
The size of the whole network minimum voltage value of D.C. high voltage transmission bipolar locking emulation is ranked up danger classes, is formed such as 3 institute of table
The danger classes table shown.Because being H according to step 3 gained cluster centre quantity, therefore respective notch is respectively as follows: grade 1, grade 2,
Grade 3, grade h ..., grade H.
3. AC network method of operation danger classes decision table of table
| Cluster stepping | Danger classes |
| 1 | It is 1 grade dangerous |
| 2 | It is 2 grades dangerous |
| … | |
| h | It is h grades dangerous |
| H | It is H grades dangerous |
In short, the method for the present invention passes through WAMS acquisition abnormity wave propagation system, to the receiving end power grid of existing alternating current-direct current power grid
Fluctuation characteristic is analyzed, can the information such as electric position, fluctuation amplitude, frequency according to fluctuation the method for operation is gathered
Class, and the analysis of flow situations and switch on condition is combined, it forms reduction and goes out Voltage Stability Level criterion, realize the exchange of direct current receiving end
The judgement of system voltage stability.
Claims (5)
1. a kind of direct current receiving end AC system voltage stability distinguishing method based on WAMS unusual fluctuations dynamically track, feature exist
In the described method comprises the following steps:
Step 1 is based on WAMS system, extracts the voltage fluctuation waveform of recent unusual fluctuations information, counts to it, when determining
The method of operation of voltage dithering situation often occurs；
The sample of step 2, acquisition fluctuation data；The attribute of institute's collecting sample is the characteristic attribute under different running method, comprising:
Attribute 1- records amplitude, attribute 2- maximum fluctuation record amplitude damping percentage, attribute 3- Dan Tian with the maximum fluctuation that MW is measured
Fluctuate quantity, bus quantity/total PMU bus monitoring quantity percentage that fluctuation in attribute 4- mono- day occurs, attribute 5- are in terms of MW
Province's net load level of amount, attribute 6- are by the electric voltage exception fluctuating level coefficient obtained of above-mentioned steps 1；
Step 3: to collected information to clustering, the information is to including: attribute 2- maximum fluctuation record amplitude resistance
Buddhist nun's percentage, attribute 6- electric voltage exception fluctuating level coefficient；
Step 4, using fitness highest information to sample point as first cluster centre；
Step 5 is modified above- mentioned information to sample point；
Step 6 determines all cluster centre point and number of clusters H；And the analysis of flow situations and switch on condition is combined, it is formed
Brief Voltage Stability Level judging basis realizes the judgement to direct current receiving end AC system voltage stability；
In the step 1, the voltage fluctuation information in 500 kilovolts and 220 kilovolts regions is extracted；
Region voltage unusual fluctuations horizontal coefficients C=voltage fluctuation bus quantity accounting+λ1× amplitude is averaged fluctuating level+by electricity
Ratio+receiving end main force dynamic reactive lays in ratio；Described is referred to by electric ratio: direct current conveys load/local area total load；Described
Receiving end main force dynamic reactive lays in ratio, refers to: bearing in 500 kilovolts of access unit installed capacity/one's respective areas in receiving end AC network
Lotus；
Wherein, voltage fluctuation bus quantity accounting are as follows: voltage fluctuation quantity is more than the bus fluctuation quantity point of threshold alpha divided by local area
All bus total quantitys by PMU system detection in domain；
λ1For the modulation value of setting,The electric voltage exception fluctuation amplitude average level in j-th of region is represented,
In,For fluctuation amplitude, NJFor the fluctuation quantity in j-th of subregion.
2. a kind of direct current receiving end AC system voltage based on WAMS unusual fluctuations dynamically track according to claim 1 is steady
Determine method of discrimination, it is characterised in that: the process of the step 2 are as follows: for unusual fluctuations waveform collected, carry out PRONY points
Solution analyzes its dominant frequency and its corresponding damping ratio according to analysis, and to damping when step 1 electric voltage exception obtained
Fluctuating level coefficient is ranked up.
3. a kind of direct current receiving end AC system voltage based on WAMS unusual fluctuations dynamically track according to claim 1 is steady
Determine method of discrimination, it is characterised in that:
In the step 3, to the information to the detailed process clustered are as follows: record the attribute 2- maximum fluctuation
Amplitude damping percentage, attribute 6- electric voltage exception fluctuating level coefficient are set as the vector of corresponding n*2, and any row indicates a letter
Breath pair；If ykFor the sample point of k information pair, wherein k is 1 natural number into n, then it becomes the general of cluster centre point
Rate are as follows:
In formula: r is a positive constant, is adjusted by experience；N is sample number；PkIndicate sample point ykWith other scheme sample points
How far, i.e. fitness of the scheme sample point as cluster centre point, PkIt will increase with r and exponential damping trend is presented；Institute
The other scheme sample points stated refer to other samples in this cluster sample populations.
4. a kind of direct current receiving end AC system voltage based on WAMS unusual fluctuations dynamically track according to claim 1 is steady
Determine method of discrimination, which is characterized in that the detailed process of the step 4-5 is respectively as follows:
Step 4: settingFor first cluster centre, P1 *For the fitness of first cluster centre point, then remaining n-1 sample point
Correction formula as scheme sample point fitness is；
In formula: effective radius β normal number；For sample point xkAs the initial fitness of cluster centre, wherein k=1,2 ...,
n-1；For through the revised new fitness of formula (2)；
Step 5: above- mentioned information being modified sample point with above-mentioned formula (2), to eliminateInfluence；It chooses and works as again
The preceding maximum sample point of fitness is as in second clusterAnd so on, it iterates until occurring in j-th of cluster
The heart makesUntil；Wherein,For the fitness of j-th of cluster centre, coefficient θ will affect the quantity of cluster centre point,
That is the numerical value of H.
5. a kind of direct current receiving end AC system voltage based on WAMS unusual fluctuations dynamically track according to claim 1 is steady
Determine method of discrimination, which is characterized in that in the step 6, the determination all cluster centre point and number of clusters H are
Refer to:
The correspondence attribute value of collecting sample according to cluster centre and the whole network of corresponding D.C. high voltage transmission bipolar locking emulation are most
Low-voltage, the gear carried out between cluster centre divides, and the minimum electricity of the whole network according to the emulation of D.C. high voltage transmission bipolar locking
The size of pressure value is ranked up danger classes, forms an AC network method of operation danger classes decision table, constitutes and corresponds to
Gear: grade 1, grade 2, grade 3 ..., grade h, grade H.
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| CN110912272B (en) * | 2019-12-03 | 2023-02-21 | 合肥工业大学 | Urban power grid fault detection method and system based on regional abnormal pattern recognition |
| CN113866550B (en) * | 2021-07-19 | 2023-10-20 | 许继集团有限公司 | Method and device for detecting phase change abnormality of high-voltage direct-current transmission |
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| EP2302754A1 (en) * | 2008-09-27 | 2011-03-30 | State Grid Corporation of China | A low frequency oscillation integrated analysis method and its system |
| CN103311939A (en) * | 2013-06-14 | 2013-09-18 | 华北电力大学（保定） | WAMS (wide area measurement system) based low-frequency oscillation coordinated damping control method for electric power system |
| CN103400046A (en) * | 2013-08-19 | 2013-11-20 | 武汉大学 | Data modeling method suitable for power grid WAMS (wide area measurement system) and application |
| CN104393590A (en) * | 2014-11-14 | 2015-03-04 | 南方电网科学研究院有限责任公司 | Intelligent identification method of transient instability mode of power grid |
| CN105098763A (en) * | 2014-05-16 | 2015-11-25 | 国家电网公司 | Transient voltage stable on-line assessment method based on WAMS and EMS |
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2017
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2302754A1 (en) * | 2008-09-27 | 2011-03-30 | State Grid Corporation of China | A low frequency oscillation integrated analysis method and its system |
| CN101577426A (en) * | 2009-03-19 | 2009-11-11 | 上海交通大学 | Power system state estimator applicable to wide area measurement system |
| CN103311939A (en) * | 2013-06-14 | 2013-09-18 | 华北电力大学（保定） | WAMS (wide area measurement system) based low-frequency oscillation coordinated damping control method for electric power system |
| CN103400046A (en) * | 2013-08-19 | 2013-11-20 | 武汉大学 | Data modeling method suitable for power grid WAMS (wide area measurement system) and application |
| CN105098763A (en) * | 2014-05-16 | 2015-11-25 | 国家电网公司 | Transient voltage stable on-line assessment method based on WAMS and EMS |
| CN104393590A (en) * | 2014-11-14 | 2015-03-04 | 南方电网科学研究院有限责任公司 | Intelligent identification method of transient instability mode of power grid |
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