CN106611959A - Voltage stability discriminating method of DC receiving-end AC system based on dynamic tracking of abnormal fluctuation of WAMS - Google Patents

Voltage stability discriminating method of DC receiving-end AC system based on dynamic tracking of abnormal fluctuation of WAMS Download PDF

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Publication number
CN106611959A
CN106611959A CN201710106442.8A CN201710106442A CN106611959A CN 106611959 A CN106611959 A CN 106611959A CN 201710106442 A CN201710106442 A CN 201710106442A CN 106611959 A CN106611959 A CN 106611959A
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voltage
attribute
sample
fluctuation
cluster centre
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CN106611959B (en
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安军
戴飞
鞠平
张毅明
韩敬东
熊浩清
周海强
镐俊杰
陈谦
陈军
孙冉
畅广辉
白梁军
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Hohai University HHU
State Grid Henan Electric Power Co Ltd
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Hohai University HHU
State Grid Henan Electric Power Co Ltd
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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
    • 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
    • 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]
    • 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 voltage stability discriminating method of a DC receiving-end AC system based on dynamic tracking of abnormal fluctuation of a WAMS. The method comprises that 1) voltage fluctuation waveforms of recent abnormal fluctuation information are extracted and counted, and an operation manner in which voltage jittering occurs frequently is determined; 2) a sample of fluctuation data is collected, and attributes of the sample are characteristic attributes in different operation manners; 3) collected information is clustered, the second attribute represents a damping ratio of a dominant frequency, and the sixth attribute represents a coefficient of the abnormal voltage fluctuation level; 4) a sample point of an information pair of highest fitness serves as a first clustering center; 5) the sample point of the information pair is corrected; and 6) all clustering center points and clustering amount H are determined, analysis is made by combining trend condition and power-on condition, a voltage stability level criterion is formed, and thus, the voltage stability of the DC receiving-end AC system is determined. The method is low in computational complexity, easy to realize online, and can realize rapid determination for voltage instability problems of the DC receiving end and reasonable construction of a linked fault set.

Description

A kind of direct current receiving end AC system voltage based on WAMS unusual fluctuations dynamic tracking is steady Determine method of discrimination
Technical field
The invention belongs to power system safety and stability analysis technical field, and in particular to a kind of dynamic based on WAMS unusual fluctuations The direct current receiving end AC system voltage stability distinguishing method of state tracking.
Background technology
China Power Grids have formed at present extra-high-voltage alternating current interconnected network, by high-voltage direct current and each big 500 kilovolts of friendships Stream electrical network is connected.According to trend, following 10-20 China will also build tens of times extra-high voltage direct-current engineerings, gradually form extra-high Pressure AC-DC hybrid power grid, 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 occurs also to be absorbed greatly from AC system after commutation failure Amount is idle, and receiving end electrical network 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 optimization Arrangement, the security and stability analysis for HVDC receiving end AC system provide effective complex art means.
For alternating current-direct current series-parallel connection feed-in receiving end electrical network, even more serious safety and stability problem is：The alternating current-direct current that may occur Straight-flow system may be caused after system cascading failure, i.e. fault in ac transmission system to continue commutation failure, and then cause direct current locking more It is high-power to be transferred to communication channel, cause linksystem mains breakdown accident.Still show single for the current research meanses of this problem, Time-domain simulation method is mainly adopted in engineering, it is assessed by the transient stability emulation combined to various ac and dc systemses failures Straight-flow system whether can be caused to continue commutation failure, and then cause even more serious cascading failure.In addition, the method is faced with work Work amount is big, the problems such as be difficult to exhaustive potential faults.Additionally, the aspect such as domestic and international formation mechenism and evolutionary process in cascading failure Carried out part research, it is proposed that after failure power flow transfer assessment, based on the analysis methods such as electrical network small world, the company of advancing The development of lock fault set constructing technology.But laying particular emphasis on theory analysis or operating experience current research to summarize, for how tying more Effective practical method that conjunction electrical network actual conditions proposition cascading failure collection builds is still needed and further develop.
Therefore, with reference to the development reality and future plan of China Power Grids, it would be highly desirable to solve alternating current-direct current series-parallel connection receiving end power grid cascading Whether straight-flow system continues the technical problems such as the quick judgement of commutation failure under the reasonable generation of fault set and cascading failure.
The content of the invention
It is an object of the invention to overcome the deficiencies in the prior art, there is provided it is a kind of based on WAMS unusual fluctuations dynamic tracking 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 computational methods and estimation flow of dynamic receiving-end system voltage stability, according to Effective contingency screen and rank is realized to the extent of injury of straight-flow system stable operation according to AC fault, trend after combination failure Transfer case realizes the reasonable construction of cascading failure collection, and receiving end line voltage unstability risk after failure can be entered more conveniently Row is quick to be judged.
In order to realize foregoing invention purpose, the present invention takes technical scheme below.
A kind of direct current receiving end AC system voltage stability distinguishing side based on WAMS unusual fluctuations dynamic tracking of the present invention Method, it is characterised in that the method comprising the steps of：
Step 1, based on WAMS systems, extract the voltage fluctuation waveform of recent unusual fluctuations information, it is counted, really Determine the frequent method of operation of voltage dithering；
The sample of step 2, collection fluctuation data；The attribute of the collecting sample is the feature category under different running method Property；
Step 3：To the information that collects to clustering：Attribute 2- dominant frequency damping ratios, attribute 6- electric voltage exception ripples Dynamic horizontal coefficients；
Step 4, using fitness highest information to sample point as first cluster centre；
Step 5, above- mentioned information is modified to sample point；
Step 6, determine all of cluster centre point and number of clusters H；And with reference to the analysis of flow situations and switch on condition, Form yojan and go out Voltage Stability Level criterion, realize the judgement to direct current receiving end AC system voltage stability.
In the step 1, the voltage pulsation information in 500 kilovolts and 220 kilovolts regions is extracted；
Region voltage unusual fluctuations horizontal coefficients C=voltage pulsation bus quantity accounting+λ1The average fluctuating level of amplitude+receive Electric ratio+receiving end main force dynamic reactive deposit 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 deposit ratio, refer to：500 kilovolts are accessed in unit installed capacity/one's respective area in receiving end AC network Load；
Wherein, voltage pulsation bus quantity accounting be voltage pulsation quantity exceed threshold alpha bus fluctuation quantity point divided by All bus total quantitys by PMU system detectios in one's respective area；
λ1To think the modulation value of setting,The electric voltage exception fluctuation amplitude represented in j-th region is average Level, wherein,For fluctuation amplitude, NJFor the fluctuation quantity in j-th subregion.
In the step 2, the attribute of described collecting sample is the characteristic attribute under different running method, including：Category Property the maximum fluctuations measured with MW of 1- record amplitude, attribute 2- maximum fluctuations record amplitude damping percentage, the mono- sky waves of attribute 3- Percentage, the attribute 5- of the bus quantity that dynamic quantity, attribute 4- fluctuations in mono- day occur/total PMU buses monitoring quantity is with MW meterings Save the electric voltage exception fluctuating level coefficient that net load level, attribute 6- are obtained by above-mentioned steps 1；
For the unusual fluctuations waveform for being gathered, carry out PRONY decomposition, according to analysis, analyze its dominant frequency and its Correspondence damping ratio, and the damping electric voltage exception fluctuating level coefficient that when step 1 is obtained is ranked up.
In the step 3, it is to the detailed process for being clustered to described information：By described attribute 2- dominant frequencies Damping ratio, attribute 6- electric voltage exception fluctuating level coefficients are set to the vector of corresponding n*2, and any row represents an information pair；If ykFor the sample point of kth ((k=1～n)) individual information pair, then its probability for becoming cluster centre point is：
In formula：R is a normal number, is adjusted by experience；N is sample number；PkRepresent sample point ykWith other scheme samples Point how far, i.e., scheme sample point as cluster centre point fitness, PkExponential damping trend will be presented with r increases. Other described scheme sample points, refer to other samples in this cluster sample populations.
The detailed process of step 4-5 is respectively：
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 numbers；For sample point xk(k=1,2 ..., n-1) as the initial of cluster centre Fitness；For the revised new fitness of Jing formulas (2)；
Step 5：Above- mentioned information is modified to sample point with above-mentioned formula (2), so as to eliminateImpact；Select again The maximum sample point of current fitness is taken as in second clusterThe like, iterate until there is j-th cluster Center, until makingTill；Wherein,For the fitness of j-th cluster centre, coefficient θ can affect cluster centre point The numerical value of quantity, i.e. H.
In the step 6, all of cluster centre point of described determination and number of clusters H are referred to：
According to the corresponding property value and the whole network minimum voltage of correspondence D.C. high voltage transmission bipolar locking emulation of cluster centre, Carry out gear between cluster centre to divide, and according to the emulation of D.C. high voltage transmission bipolar locking the whole network minimum voltage value it is big It is little that danger classes is ranked up, an AC network method of operation danger classes decision table is formed, constitute respective notch：Grade 1, grade 2, grade 3, grade h ..., grade H.
Compared with prior art, the advantages of the present invention include：
The assessment of present invention Voltage Stability Level evaluation index after receiving end fault in ac transmission system after to different faults, can To realize that AC network single failure sorts；Power flow transfer assessment after combination failure on this basis, can be with rapid build more Reasonably, meet the actual cascading failure collection of electrical network, judge that it causes alternating current-direct current series-parallel connection straight-flow system to continue the wind of commutation failure Danger.Compared with art methods, amount of calculation of the present invention is little, explicit physical meaning, it is easy to on-line implement, is capable of achieving direct current and continues Commutation failure risk is the quick judgement of direct current receiving end Voltage Instability problem, and is capable of achieving the reasonable construction of cascading failure collection.
Description of the drawings
Fig. 1 is direct current receiving end AC system voltage stability distinguishing method of the present invention based on WAMS unusual fluctuations dynamic tracking A kind of embodiment method flow diagram.
Fig. 2 is a kind of AC-DC hybrid power grid structural representation of embodiment of the present invention.
Fig. 3 is that cascading failure occurs rear portion denominator line voltage recovery curve figure in a kind of embodiment of the invention.
Fig. 4 be the present invention a kind of embodiment in 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 direct current receiving end AC system voltage stability distinguishing method of the present invention based on WAMS unusual fluctuations dynamic tracking A kind of embodiment method flow diagram.As shown in figure 1, the embodiment method is comprised the following steps：
Step 1, based on WAMS systems, extract the voltage fluctuation waveform of recent unusual fluctuations information, it is counted, really Determine the frequent method of operation of voltage dithering；
The sample of step 2, collection fluctuation data；The attribute of the collecting sample is the feature category under different running method Property；
Step 3：To the information that collects to clustering：Attribute 2- dominant frequency damping ratios, attribute 6- electric voltage exception ripples Dynamic horizontal coefficients；
Step 4, using fitness highest information to sample point as first cluster centre；
Step 5, above- mentioned information is modified to sample point；
Step 6, determine all of cluster centre point and number of clusters H；And with reference to the analysis of flow situations and switch on condition, Form yojan and go out Voltage Stability Level criterion, realize the judgement to direct current receiving end AC system voltage stability.
In the step 1, the voltage pulsation information in 500 kilovolts and 220 kilovolts regions is extracted；
Region voltage unusual fluctuations horizontal coefficients C=voltage pulsation bus quantity accounting+λ1The average fluctuating level of amplitude+receive Electric ratio+receiving end main force dynamic reactive deposit 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 deposit ratio, refer to：500 kilovolts are accessed in unit installed capacity/one's respective area in receiving end AC network Load；
Wherein, voltage pulsation bus quantity accounting be voltage pulsation quantity exceed threshold alpha bus fluctuation quantity point divided by All bus total quantitys by PMU system detectios in one's respective area；
λ1To think the modulation value of setting,The electric voltage exception fluctuation amplitude represented in j-th region is put down Equal level, wherein,For fluctuation amplitude, NJFor the fluctuation quantity in j-th subregion.
In the step 2, the attribute of described collecting sample is the characteristic attribute under different running method, including：Category Property the maximum fluctuations measured with MW of 1- record amplitude, attribute 2- maximum fluctuations record amplitude damping percentage, the mono- sky waves of attribute 3- Percentage, the attribute 5- of the bus quantity that dynamic quantity, attribute 4- fluctuations in mono- day occur/total PMU buses monitoring quantity is with MW meterings Save the electric voltage exception fluctuating level coefficient that net load level, attribute 6- are obtained by above-mentioned steps 1；
For the unusual fluctuations waveform for being gathered, carry out PRONY decomposition, according to analysis, analyze its dominant frequency and its Correspondence damping ratio, and the damping electric voltage exception fluctuating level coefficient that when step 1 is obtained is ranked up.
In the step 3, it is to the detailed process for being clustered to described information：By described attribute 2- dominant frequencies Damping ratio, attribute 6- electric voltage exception fluctuating level coefficients are set to the vector of corresponding n*2, and any row represents an information pair；If ykFor the sample point of kth ((k=1～n)) individual information pair, then its probability for becoming cluster centre point is：
In formula：R is a normal number, is adjusted by experience；N is sample number；PkRepresent sample point ykWith other scheme samples Point how far, i.e., scheme sample point as cluster centre point fitness, PkExponential damping trend will be presented with r increases.
One sample sequence of the scheme of scheme sample point, i.e., therefore referred to as scheme sample.Because inventive algorithm is poly- Space-like research field, therefore sample sequence is referred to as scheme sample point in Cluster space.So, other scheme samples Point, can depending on being interpreted as this this cluster sample populations in other samples.
The detailed process of step 4-5 is respectively：
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 numbers；For sample point xk(k=1,2 ..., n-1) as the initial of cluster centre Fitness；For the revised new fitness of Jing formulas (2)；
Step 5：Above- mentioned information is modified to sample point with above-mentioned formula (2), so as to eliminateImpact；Select again The maximum sample point of current fitness is taken as in second clusterThe like, iterate until there is j-th cluster Center, until makingTill；Wherein,For the fitness of j-th cluster centre, coefficient θ can affect cluster centre point The numerical value of quantity, i.e. H.
In the step 6, all of cluster centre point of described determination and number of clusters H are referred to：
According to the corresponding property value and the whole network minimum voltage of correspondence D.C. high voltage transmission bipolar locking emulation of cluster centre, Carry out gear between cluster centre to divide, and according to the emulation of D.C. high voltage transmission bipolar locking the whole network minimum voltage value it is big It is little that danger classes is ranked up, an AC network method of operation danger classes decision table is formed, constitute respective notch：Grade 1, grade 2, grade 3, grade h ..., grade H.
Fig. 2 is a kind of AC-DC hybrid power grid structural representation of embodiment of the present invention, and its AC-DC hybrid power grid is near Area's voltage evaluation deterministic process is described as follows：
A, by taking certain big regional power grid HVDC receiving end near region as an example, electrical network normal operating mode arrange it is as follows：Around height Straightening stream feed-in, 500kV E stations, F stations, three stations of C stations form alternating current-direct current feed-in receiving end electrical network, by 500kV E stations current conversion station-G - F stations, F stations-G stations, the southern double back in E stations-E stations, E stations-I stations, E stations-D stations, C stations-D stations, B stations-A stations double back, B are changed in stand double back, E stations - E stations of standing are changed double-circuit line and are connected with major network, and local load about 51% is accounted for by electric power outside the direct current receiving end near region.Under which, 500kV F stations, E stations, C stations busbar voltage are respectively 503.2,502.0,495.6kV.
The direct current receiving end near region 220kV busbar voltages are operated between 198～216kV, and voltage level is relatively low；The direct current is received End near region accesses 220kV electrical networks unit and has reached the idle upper limit substantially, standby without dynamic.
B, according to above-mentioned steps of the present invention 1 below equation, the Voltage Stability Level coefficient in zoning：
Region voltage unusual fluctuations horizontal coefficients C=voltage pulsation bus quantity accounting+λ1The average fluctuating level of amplitude+receive Electric ratio+receiving end main force dynamic reactive deposit ratio
Wherein, referred to by electric ratio：Direct current conveys load/local area total load；Described 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 pulsation bus quantity accounting is：Voltage pulsation quantity exceedes the bus of threshold alpha and fluctuates quantity point divided by local area All bus total quantitys by PMU system detectios in domain；
λ1To think the modulation value of setting,The electric voltage exception fluctuation amplitude represented in j-th region is put down Equal level, wherein,For fluctuation amplitude, NJFor the fluctuation quantity in j-th subregion.
Thus, show that the Voltage Stability Level coefficient table in region refers to table 1 below.
Voltage Stability Level coefficient table in the region of table 1.
C, as listed by table 2 below, collection fluctuation data sample.The attribute of institute's collecting sample is the spy under different running method Levy attribute.
Table 2. is according to PMU monitoring bus fluctuation dominant frequency tables
D, to the information that collects to (dominant frequency damping ratio (attribute 2), electric voltage exception fluctuating level coefficient (attribute 6)) Clustered.The vector of corresponding n*2 is set to, any row represents an information to (dominant frequency damping ratio, electric voltage exception fluctuation 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 numbers；For sample point xk(k=1,2 ..., n-1) as the initial of cluster centre Fitness；It is new fitness revised through formula (2).
F, above- mentioned information is modified to sample point with formula (3), is eliminatedImpact, then choose current fitness most Big sample point is used as in second clusterThe like, iterate until there is j-th cluster centre, make Till, whereinFor the fitness of j-th cluster centre, coefficient θ can affect the numerical value of the quantity of cluster centre point, i.e. H.
G, thereby determine that all of cluster centre point and number of clusters H=2.And according to cluster centre corresponding property value and The whole network minimum voltage of correspondence D.C. high voltage transmission bipolar locking emulation, the gear carried out between cluster centre is divided, and foundation The size of the whole network minimum voltage value of D.C. high voltage transmission bipolar locking emulation is ranked up to danger classes, is formed such as the institute of table 3 The danger classes table for showing.Because being H according to step 3 gained cluster centre quantity, therefore respective notch is respectively：Grade 1, grade 2, Grade 3, grade h ..., grade H.
The AC network method of operation danger classes decision table of table 3.
Cluster stepping Danger classes
1 It is dangerous 1 grade
2 It is dangerous 2 grades
…
h Dangerous h levels
H Dangerous H levels
In a word, the inventive method is by WAMS acquisition abnormity wave propagation systems, the receiving end electrical network to existing alternating current-direct current electrical network Fluctuation characteristic is analyzed, and the method for operation can be gathered according to information such as electric position, fluctuation amplitude, the frequency of fluctuation Class, and with reference to the analysis of flow situations and switch on condition, form yojan and go out Voltage Stability Level criterion, realize that direct current receiving end is exchanged The judgement of system voltage stability.

Claims (6)

1. a kind of based on the dynamic direct current receiving end AC system voltage stability distinguishing method for tracking of WAMS unusual fluctuations, its feature exists In the method comprising the steps of：
Step 1, based on WAMS systems, extract the voltage fluctuation waveform of recent unusual fluctuations information, it is counted, it is determined that electric The frequent method of operation of pressure shake；
The sample of step 2, collection fluctuation data；The attribute of institute's collecting sample is the characteristic attribute under different running method；
Step 3：To the information that collects to clustering：Attribute 2- dominant frequency damping ratios, attribute 6- electric voltage exception wave waters Flat coefficient；
Step 4, using fitness highest information to sample point as first cluster centre；
Step 5, above- mentioned information is modified to sample point；
Step 6, determine all of cluster centre point and number of clusters H；And with reference to the analysis of flow situations and switch on condition, formed Yojan goes out Voltage Stability Level criterion, realizes the judgement to direct current receiving end AC system voltage stability.
2. a kind of direct current receiving end AC system voltage based on WAMS unusual fluctuations dynamic tracking according to claim 1 is steady Determine method of discrimination, it is characterised in that：
In the step 1, the voltage pulsation information in 500 kilovolts and 220 kilovolts regions is extracted；
Region voltage unusual fluctuations horizontal coefficients C=voltage pulsation bus quantity accounting+λ1The average fluctuating level of amplitude+compared by electricity Example+receiving end main force dynamic reactive deposit ratio；Described is referred to by electric ratio：Direct current conveys load/local area total load；Described receives End main force dynamic reactive deposit ratio, refers to：500 kilovolts of access unit installed capacity/one's respective area internal loadings in receiving end AC network；
Wherein, voltage pulsation bus quantity accounting is that voltage pulsation quantity exceedes the bus fluctuation quantity point of threshold alpha divided by local area All bus total quantitys by PMU system detectios in domain；
λ1To think the modulation value of setting,Represent the electric voltage exception fluctuation amplitude average water in j-th region It is flat, wherein,For fluctuation amplitude, NJFor the fluctuation quantity in j-th subregion.
3. a kind of direct current receiving end AC system voltage based on WAMS unusual fluctuations dynamic tracking according to claim 1 is steady Determine method of discrimination, it is characterised in that：
In the step 2, the attribute of described collecting sample is the characteristic attribute under different running method, including：Attribute 1- Maximum fluctuation record amplitude, attribute 2- maximum fluctuations record amplitude damping percentage, the mono- day fluctuation number of attribute 3- measured with MW The province that the bus quantity that amount, attribute 4- fluctuations in the mono- day occur/percentage of total PMU buses monitoring quantity, attribute 5- are measured with MW The electric voltage exception fluctuating level coefficient that net load level, attribute 6- are obtained by above-mentioned steps 1；
For the unusual fluctuations waveform for being gathered, PRONY decomposition is carried out, according to analysis, analyze its dominant frequency and its correspondence Damping ratio, and the damping electric voltage exception fluctuating level coefficient that when step 1 is obtained is ranked up.
4. a kind of direct current receiving end AC system voltage based on WAMS unusual fluctuations dynamic tracking according to claim 1 is steady Determine method of discrimination, it is characterised in that：
In the step 3, it is to the detailed process for being clustered to described information：Described attribute 2- dominant frequencies are damped Than the vector that, attribute 6- electric voltage exception fluctuating level coefficients are set to corresponding n*2, any row represents an information pair；If ykFor The sample point of kth ((k=1～n)) individual information pair, then its probability for becoming cluster centre point be：
P k = Σ j = 1 n e - r | | y k - y j | | 2 - - - ( 1 )
In formula：R is a normal number, is adjusted by experience；N is sample number；PkRepresent sample point ykWith other scheme sample points How far, i.e. scheme sample point as cluster centre point fitness, PkExponential damping trend will be presented with r increases；It is described Other scheme sample points, refer to this cluster sample populations in other samples.
5. a kind of direct current receiving end AC system voltage based on WAMS unusual fluctuations dynamic tracking according to claim 1 is steady Determine method of discrimination, it is characterised in that the detailed process of step 4-5 is respectively：
Step 4：IfFor first cluster centre, P1 *For the fitness of first cluster centre point, then remaining n-1 sample point It is as the correction formula of scheme sample point fitness；
P k n e w = P k o l d - P 1 * e - β | | y k - y 1 * | | 2 - - - ( 2 )
In formula：Effective radius β normal numbers；For sample point xk(k=1,2 ..., n-1) as the initial adaptation of cluster centre Degree；For the revised new fitness of Jing formulas (2)；
Step 5：Above- mentioned information is modified to sample point with above-mentioned formula (2), so as to eliminateImpact；Choose again and work as The maximum sample point of front fitness is used as in second clusterThe like, in iterating until there is j-th cluster The heart, makesTill；Wherein,For the fitness of j-th cluster centre, coefficient θ can affect the quantity of cluster centre point, That is the numerical value of H.
6. a kind of direct current receiving end AC system voltage based on WAMS unusual fluctuations dynamic tracking according to claim 1 is steady Determine method of discrimination, it is characterised in that in the step 6, all of cluster centre point of described determination and number of clusters H are Refer to：
According to the corresponding property value and the whole network minimum voltage of correspondence D.C. high voltage transmission bipolar locking emulation of cluster centre, carry out Gear between cluster centre is divided, and the size pair of the whole network minimum voltage value according to the emulation of D.C. high voltage transmission bipolar locking Danger classes is ranked up, and forms an AC network method of operation danger classes decision table, constitutes respective notch：Grade 1, etc. Level 2, grade 3, grade h ..., grade H.
CN201710106442.8A 2017-02-27 2017-02-27 A kind of direct current receiving end AC system voltage stability distinguishing method based on WAMS unusual fluctuations dynamically track Expired - Fee Related CN106611959B (en)

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CN108647851A (en) * 2018-03-30 2018-10-12 中国电力科学研究院有限公司 A kind of short-term grid stability prediction technique and system for improving neural network based on multilayer
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CN110912272A (en) * 2019-12-03 2020-03-24 合肥工业大学 Urban power grid fault detection method and system based on regional abnormal pattern recognition
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CN113866550A (en) * 2021-07-19 2021-12-31 许继集团有限公司 Method and device for detecting commutation abnormity of high-voltage direct-current transmission
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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