CN107403239A - A kind of parameters analysis method for being used for control device in power system - Google Patents
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Abstract
The embodiment of the invention discloses a kind of parameters analysis method for being used for control device in power system, it is related to reactive power optimization of power system On-line Control field, realizes the automatically and reasonably setting of parameter in idle work optimization On-line Control.The present invention includes：Bus load prediction data is divided automatically and obtains the period section needed for excavating；Choose associate field needed for excavating and day part data in history library are arranged；Choose history library result and conversion portion field attribute in i-th of period；Calculate the similarity of different field attribute between i period internal loading prediction curves and history library set；Each attribute respective value is quantified using fuzzy membership function；Excavated using Mining fuzzy association rules method；Obtain the Strong association rule for meeting confidence level；Anti fuzzy method processing is carried out to correlation rule, equipment Time segments division is obtained and action frequency sets result.
Description
Technical field
The present invention relates to reactive power optimization of power system control field, more particularly to one kind to be used for control device in power system
Parameters analysis method.
Background technology
Currently, in power system on control device, idle work optimization On-line Control by years of researches increasingly into
It is ripe and achieve and be widely applied.However, the setting of the key parameter such as action frequency of control device it is relatively complicated and
It is not easy to hold, often due to setting the unreasonable Actual Control Effect of Strong that often results in be a greater impact.
And the parameter setting of control device is configured by the personal experience of operations staff mostly in traditional idle work optimization,
Such as：The setting of the two important parameters of transformer gear action frequency and compensation number of equipment action in one day.Generally first will
After one period was divided by the load tendency of transformer station substantially, equipment in the period is set one by one further according to the experience of itself
Action frequency, this main or dividing mode based on artificial experience, the often subjective judgement because of operations staff or load season
Property change and safeguard the reason such as not in time, often occur the undesirable phenomenon of control effect afterwards for a period of time in system operation, in order to
Ensure the effect of optimization of On-line Control, operations staff often needs the feature according to load variations, the setting result to key parameter
Constantly adjusted.And in large area power network, the frequent adjustment of device parameter can bring huge work to operations staff
Measure, and due to lacking enough operations staffs with abundant O＆M experience, it is also difficult to hold the Time segments division of load with
And in the specific period action frequency accurate setting, the control effect ultimately resulted in large area network system is difficult
Further optimization.
The content of the invention
Embodiments of the invention provide a kind of parameters analysis method for being used for control device in power system, realize idle excellent
Change the automatically and reasonably setting of parameter in On-line Control.
To reach above-mentioned purpose, embodiments of the invention adopt the following technical scheme that：
Overall procedure, including：
Obtain the bus load prediction result required for excavating；
Bus load prediction data is divided automatically and obtains the period section needed for excavating；
Choose associate field needed for excavating and day part data in history library are arranged；
Choose history library result and conversion portion field attribute in i-th of period；
Calculate the similarity of different field attribute between i period internal loading prediction curves and history library set；
Each attribute respective value is quantified using fuzzy membership function；
Excavated using Mining fuzzy association rules method；
Obtain the Strong association rule for meeting confidence level；
Pass through i<li,maxJudge whether all periods all excavate and complete (li,maxRepresent the maximum of present period, i tables
Show the numbering of marked off period, 1≤i≤max), step 10 is transferred to if all excavating and completing, is otherwise transferred to step 4；
Anti fuzzy method processing is carried out to correlation rule, equipment Time segments division is obtained and action frequency sets result；
This excavates calculating and terminated.
Wherein, if sequencing of the overall procedure according to execution, is specifically included：Data preparation stage, excavation meter before excavation
The stage that parameter setting result is obtained with regular generation phase and according to rule is calculated, specifically：
Include before excavation described in A the step of data preparation stage：
Step A-1, obtain the bus load prediction result required for excavating；
Step A-2, bus load prediction data is divided automatically and obtains the period section needed for excavating；
Step A-3, associate field needed for excavating is chosen, and arrangement is performed to day part data in history library；
Excavate to calculate described in B includes with the step of regular generation phase：
Step B-1, the history library result in i-th of period is chosen, and change field attribute；
Step B-2, calculate between i period internal loading prediction curves and history library set, the similarity of different field attribute；
Step B-3, each attribute respective value is quantified using fuzzy membership function；
Step B-4, excavated using Mining fuzzy association rules method；
Step B-5, obtain the Strong association rule for meeting confidence level and interest-degree；
Step B-6, passes through i<li,maxJudge whether all periods all excavate to complete, C- is transferred to if all excavating and completing
1, otherwise it is transferred to B-1, wherein li,maxThe maximum of expression present period, the numbering of i expressions marked off period, 1≤i≤
max；
The step of obtaining the stage of parameter setting result according to rule described in C includes：
Step C-1, anti fuzzy method processing is carried out to correlation rule, obtain equipment Time segments division and action frequency sets knot
Fruit；
Step C-2, this excavates calculating and terminated.The ginseng provided in an embodiment of the present invention for being used for control device in power system
Number analysis method, by obtaining the Time segments division of distinct device and setting for period intrinsic parameter using association mining to historical data base
Result is put, short-term bus load prediction data is introduced and classifying rationally is carried out to prediction curve to obtain the period subregion of equipment,
Secondly similarity-rough set is carried out to data set in the identical period in period internal loading curve and database, eventually through the period
The association mining of interior database obtains the reasonable distribution number of parameter, so as to realize the automatic of parameter in idle work optimization On-line Control
Rationally set.While operations staff's working strength is mitigated, it ensure that key parameter sets the reasonability and accuracy of result,
So as to improve the overall control effect of reactive power optimization.
Brief description of the drawings
Technical scheme in order to illustrate the embodiments of the present invention more clearly, it will use below required in embodiment
Accompanying drawing is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the present invention, for ability
For the those of ordinary skill of domain, on the premise of not paying creative work, it can also be obtained according to these accompanying drawings other attached
Figure.
Fig. 1 is the overview flow chart of the present invention；
Fig. 2 is the load prediction curve Time segments division flow chart of the present invention；
Fig. 3 is similarity calculating method flow chart between set of the invention；
Fig. 4 is a kind of schematic diagram of instantiation of the present invention；
Fig. 5 is the flow chart of the fast algorithm for mining of the improvement fuzzy association rules of the present invention；
Fig. 6 is the flow chart that Rules Filtering is carried out using Strong association rule screening strategy of the present invention.
Embodiment
To make those skilled in the art more fully understand technical scheme, below in conjunction with the accompanying drawings and specific embodiment party
Formula is described in further detail to the present invention.Embodiments of the present invention are described in more detail below, the embodiment is shown
Example is shown in the drawings, wherein same or similar label represents same or similar element or has identical or class from beginning to end
Like the element of function.Embodiment below with reference to accompanying drawing description is exemplary, is only used for explaining the present invention, and can not
It is construed to limitation of the present invention.Those skilled in the art of the present technique are appreciated that unless expressly stated, odd number shape used herein
Formula " one ", "one", " described " and "the" may also comprise plural form.It is to be further understood that the specification of the present invention
The middle wording " comprising " used refers to the feature, integer, step, operation, element and/or component be present, but it is not excluded that
In the presence of or other one or more features of addition, integer, step, operation, element, component and/or their groups.It should be understood that
When we claim element to be " connected " or during " coupled " to another element, it can be directly connected or coupled to other elements, or
There may also be intermediary element.In addition, " connection " used herein or " coupling " can include wireless connection or coupling.Here make
Wording "and/or" includes any cell of one or more associated list items and all combined.The art
Technical staff is appreciated that unless otherwise defined all terms (including technical term and scientific terminology) used herein have
With the general understanding identical meaning of the those of ordinary skill in art of the present invention.It is it should also be understood that such as general
Those terms defined in dictionary, which should be understood that, has the meaning consistent with the meaning in the context of prior art, and
Unless being defined as here, will not be explained with the implication of idealization or overly formal.
The embodiment of the present invention provides a kind of parameters analysis method for being used for control device in power system, is mainly used in idle
Optimize the INTELLIGENT IDENTIFICATION of key parameter in On-line Control, it is cumbersome to solve key parameter setting in existing idle work optimization On-line Control
And the problem of setting result inaccurate.The overall procedure of this method as shown in figure 1, including：
Obtain the bus load prediction result required for excavating；
Bus load prediction data is divided automatically and obtains the period section needed for excavating；
Choose associate field needed for excavating and day part data in history library are arranged；
Choose history library result and conversion portion field attribute in i-th of period；
Calculate the similarity of different field attribute between i period internal loading prediction curves and history library set；
Each attribute respective value is quantified using fuzzy membership function；
Excavated using Mining fuzzy association rules method；
Obtain the Strong association rule for meeting confidence level；
Pass through i<li,maxJudge whether all periods all excavate and complete (li,maxRepresent the maximum of present period, i tables
Show the numbering of marked off period, 1≤i≤max), step 10 is transferred to if all excavating and completing, is otherwise transferred to step 4；
Anti fuzzy method processing is carried out to correlation rule, equipment Time segments division is obtained and action frequency sets result；
This excavates calculating and terminated.
Wherein, if sequencing of the overall procedure according to execution, is specifically included：Data preparation stage, excavation meter before excavation
The stage that parameter setting result is obtained with regular generation phase and according to rule is calculated, specifically：
Include before excavation described in A the step of data preparation stage：
Step A-1, obtain the bus load prediction result required for excavating；
Step A-2, bus load prediction data is divided automatically and obtains the period section needed for excavating；
Step A-3, associate field needed for excavating is chosen, and arrangement is performed to day part data in history library；
Excavate to calculate described in B includes with the step of regular generation phase：
Step B-1, the history library result in i-th of period is chosen, and change field attribute；
Step B-2, calculate between i period internal loading prediction curves and history library set, the similarity of different field attribute；
Step B-3, each attribute respective value is quantified using fuzzy membership function；
Step B-4, excavated using Mining fuzzy association rules method；
Step B-5, obtain the Strong association rule for meeting confidence level and interest-degree；
Step B-6, passes through i<li,maxJudge whether all periods all excavate to complete, C- is transferred to if all excavating and completing
1, otherwise it is transferred to B-1, wherein li,maxThe maximum of expression present period, the numbering of i expressions marked off period, 1≤i≤
max；
The step of obtaining the stage of parameter setting result according to rule described in C includes：
Step C-1, anti fuzzy method processing is carried out to correlation rule, obtain equipment Time segments division and action frequency sets knot
Fruit；
Step C-2, this excavates calculating and terminated.The ginseng provided in an embodiment of the present invention for being used for control device in power system
The offering question of key parameter in idle work optimization On-line Control is analyzed and handled to number analysis methods, the angle brand-new from one,
To solve the problems, such as that key parameter sets cumbersome and setting result inaccurate in existing idle work optimization On-line Control.The present invention is directed to
The problem of key parameter (such as number of equipment action) sets cumbersome and setting result to be not easy to hold in idle work optimization On-line Control,
Using the method for association mining, the automatic precisely identification of key parameter in idle work optimization is realized, especially by historical data
Storehouse obtains the Time segments division of distinct device and the setting result of period intrinsic parameter using association mining, and it is pre- to introduce short-term bus load
Survey data and classifying rationally is carried out to prediction curve to obtain the period subregion of equipment, secondly to period internal loading curve and data
Data set carries out similarity-rough set in the identical period in storehouse, and parameter is obtained eventually through the association mining of database in the period
Reasonable distribution number, so as to realize the automatically and reasonably setting of parameter in idle work optimization On-line Control.
It is also automatic in time and to be rationally provided with idle work optimization On-line Control while operations staff's working strength is mitigated
Parameter, it ensure that key parameter sets the reasonability and accuracy of result, so as to improve the overall control effect of reactive power optimization
Fruit, a kind of practicable method is provided for the further lifting of reactive power optimization On-line Control effect.
In the present embodiment, as shown in Fig. 2 the step A-2 includes：
A-2-1, read in bus load prediction curve data；
A-2-2, set the peak valley number threshold values N of bus load prediction curve；
A-2-3, the bus load prediction data is arranged by ascending order, obtains the ascending order of the bus load prediction data
The set S of arrangement；
A-2-4, choose in set S in preceding F data deposit set SF, wherein, set SF is to include the number in set S
According to subset, F=3 in default situations；
A-2-5, by the A-2-3 gained put in order, two number SF in set of computations SFi,tAnd SFi+1,tBetween
Time interval, if SFi,t-SFi+1,t≤ δ (i=1 ..., F-1), wherein, δ is setting threshold values, δ=3 under default situations, then into
Stand and be transferred to A-2-6, be otherwise transferred to A-2-7, SFi,tRepresent i-th of number, SF in set SFi+1,tRepresent i+1 in set SF
Number；
A-2-6, SF is deleted in set SFi+1,tAnd supplement SN+1Into set SF, A-2-5, S are transferred toN+1Represent in set S
The N+1 number；
A-2-7, the bus load prediction data is arranged in descending order, obtain the descending of the bus load prediction data
The set J of arrangement；
A-2-8, choose in set J in preceding G data deposit set JG, wherein, set JF is to include the number in set J
According to subset, G=2 in default situations；
A-2-9, in order two number JG in set of computations JGi,tAnd JGi+1,tBetween time interval, if JGi,t-
JGi+1,t≤ δ (i=1 ..., G-1), then set up and be transferred to A-2-10, be otherwise transferred to A-2-11, JGi,tAnd JGi+1,tRepresent respectively
I-th and i+1 number in set JG；
A-2-10, JG is deleted in set JGi+1,tAnd supplement SN+1Into set SF, A-2-9 is transferred to；
A-2-11, merge set SF and JG, and according to time sequence generate new set SHFi,t(i=1 ..., G+F), and
Will set SHFi,tIn be a Time segments division between two neighboring number, be transferred to A-2-12；
A-2-12, the step A-2 terminate.
In the present embodiment, in the step A-3：The specific field of associate field needed for selected excavation is：Represent year
The date field of the day moon, the field for representing current time, the field for representing burden with power or load or burden without work, expression busbar voltage
Value field, indication transformer gear value field, represent compensation equipment switching state.
In the present embodiment, in the step B-1, the field attribute changed includes：" bus voltage value " is changed
For " voltage gets over line number " and " voltage deviation "；
" transformer gear value " is converted to " transformer action number "；
" compensation equipment switching state " is converted to " compensation number of equipment action ".
Because the excavation object discussed in Mining fuzzy association rules is all discrete magnitude, and the excavation condition of the present embodiment and
There is continuous quantity in attribute in addition to discrete magnitude, such as load, voltage etc. is all continuous quantity, therefore in order to use existing pass
Join rule mining algorithms, it is necessary to sliding-model control is carried out to continuous quantity, connection attribute is changed into Category Attributes and usually required
Connection attribute is divided, can preferably be avoided and drawn by the blurring to attribute using membership function in fuzzy mathematics
The problem of by stages is stiff.The present embodiment carries out Fuzzy processing to each attribute in excavation, wherein active and load or burden without work uses
Fig. 4 (a) Triangleshape grade of membership function expression, voltage deviation and voltage out-of-limit number use Fig. 4 (b) triangle degree of membership letter
Number represents.In the step B-3, connection attribute is changed into Category Attributes according to membership function in fuzzy mathematics, then
Fuzzy language corresponding to each attribute is followed successively by：
Active and load or burden without work be defined as very dissimilar (SN), dissimilar (N), somewhat like (S), more similar (B),
Closely similar (HB) }；
Busbar voltage deviation definition is { deviation is smaller (L), there is certain deviation (M), and deviation is larger (H) }；
Voltage out-of-limit number is defined as { without out-of-limit, out-of-limit number is less, and out-of-limit number is more }；
Gear action frequency number is defined as { less, normally, more }；
Capacitor switching number number is defined as { less, normally, more }.
In the present embodiment, also by the way that two methods of ED and DTW are combined, a kind of phase as shown in Figure 3 has been redesigned
Like the comparative approach of degree：
Common, the computational methods of different attribute similarity can use between set：
The method of Euclidean distance Euclidenan (ED) similarity system design, wherein, X, Y are two groups of sequences.
M is sequence length, and the comparison of similitude is carried out to X, Y using Euclidean distance computational methods：
After calculating the distance between X, Y D (X, Y), as D (X, Y)<During δ (δ is given threshold values), it is possible to determine that two groups of times
Sequence is similar.This method calculating is directly perceived simple, and it is easy to realize, but to noise data more sensitivity and is not easy the shape of processing time axle
Change problem.In view of difficulty of the Euclidean distance in processing time axle deformation, dynamic time warping distance DTW (Dynamic
Time Warping) time shaft deformation problems are can effectively solve the problem that, its main thought is that hypothesis has two time serieses X and Y
N, m are its length respectively, can be n=m or n ≠ m here, structural matrix n × m matrix Ds.In matrix
Each class value represents the distance between putting between time series, works as xn,ymBetween it is more similar, its value is closer to zero；Inverse value is bigger.
The corresponding relation of each point is no longer to correspond in DTW, in order to find beeline between sequence, sets tortuous path a W, W
=w1,w2,…,wk,…wK, while max (m, n)≤K≤m+n+1
Meet that the path between two time serieses of constraints is a lot, but tortuous path is required to meet minimal distortion cost.
Understand that minimal path only needs to do Local Search to matrix D based on the thoery of dynamic programming, it is assumed that point (xi,yi) most
On shortest path, then point (x1,y1) arrive point (xi,yi) subpath be also matrix optimal solution.Therefore optimal path can be by starting point
(x1,y1) arrive terminal (xn,ym) between obtained by recursive search.Define the DTW distance definitions between any two points in two sequences
For：
D (i, j)={ d (xi,yj)2+[min{D(i-1,j-1),D(r-1,j),D(i,j-1)}]2}1/2 (6)
Here d (xi,yj) Euclidean distance is represented, from formula it can be seen that D (i, j) distance between sequence between two points i, j
Really (x1,y1) arrive (xi,yj) between minimum Cumulative Distance.
Because ED and DTW has respective limitation in similarity of curves comparison, it is day to excavate object in the present embodiment
Load curve, if carrying out Similarity Measure only with ED, it is contemplated that the shortage of data being likely to occur in day-to-day operation, to going through
It is possible that larger accuracy error, this can be caused to final association mining result during history database progress similarity-rough set
Considerable influence.But if using DTW, although larger lifting can be obtained in the comparison accuracy of similarity, come from computational efficiency
See, the characteristics of calculating due to DTW, when the data of database using the whole year or for many years are excavated, amount of calculation can be caused huge
Greatly, it is unfavorable for practical application.Therefore the present invention is weighted processing to traditional ED methods first, eliminates curve amplitude translation and stretches
Contracting is on influence caused by Time Series Similarity.The method of standardization is mainly normalized using variance and average, it is assumed that sequence
Arrange X={ x1,x2,…,xn), Y={ y1,y2,…,yn) by taking sequence X as an example, the average of the sequence isVariance is D (X)=E (x2)-(E(x))2, standardize and use formula (7)
Then former sequence X is changed into X'={ x '1,x'2,…,x'n), Y is changed into Y'={ y '1,y'2,…,y'n), now using Europe
The similarity that formula distance calculates two sequences has equation below：
Although sequence be standardized operation be advantageous to sequence similarity-rough set, in actual database by
In the passage and data maintenance the problems such as, the situation of time point upper loss of data often occurs in database, if in time series
Only with standardization ED distances in the Similarity measures of comparison, to some, time series is not caused by data point is lost
Situation about matching somebody with somebody, Similarity measures result is it is possible that relatively large deviation, it is contemplated that DTW is excellent in processing time sequence mismatch
Two methods of ED and DTW are combined by gesture, the present embodiment, have redesigned a kind of comparative approach of similarity as shown in Figure 3,
I.e. in the step B-2, including：
B-2-1, i Time segments division of bus load prediction is obtained, and the data in i period are saved in set Gi
In；
B-2-2, history library record is read, and be stored in set D, wherein, " history library " refers specifically to store historical data
Database, or the memory space for the store historical data opened up on a memory, wherein the essential record electricity of Historic Section
Pressure, active, idle, the information as historical data such as control device action frequency；
B-2-3, calculate GiGather interior element number, and be designated as m_Gi；
B-2-4, obtain in period i, j-th strip data acquisition system D in the set Dij, and calculate DijMiddle element number, and remember
For m_Dij；
B-2-5, judge m_GiAnd m_DijIt is whether equal, if m_Gi=m_DijThen using standardization ED (Euclidenan,
Euclidean distance) distance calculate similarity, otherwise using standardization DTW (Dynamic Time Warping, dynamic time warping away from
From) with a distance from calculate similarity；
B-2-6, the similarity between being gathered, if j<lj,maxJ=j+1 is then made, and is transferred to B-2-4, is otherwise transferred to B-
2-7；
B-2-7, complete the calculating of similarity between all set in the i periods；
B-2-8, if i<li,maxI=i+1 is then made, is transferred to B-2-3, otherwise
It is transferred to B-2-9；
Similarity Measure in B-2-9, the step B-2 terminates.
In the present embodiment, a kind of quick excavation scheme of key parameter in Reactive power control is also provided, specifically, such as
Shown in Fig. 5, in the step B-4, excavated using fast algorithm for mining (such as using a kind of based on improving Fuzzy Correlation
Fast algorithm for mining (the Fast Mining Algorithms based on Improved Fuzzy Association of rule
Rules, FMAIFAR) excavated)；
The fast algorithm for mining includes：
Step B-4-1, input data set；
Step B-4-2, the data in attribute in the data set are carried out at blurring using selected membership function
Reason；
Step B-4-3, calculate the fuzzy support degree that Fuzzy divide is corresponded in each item collection；
Step B-4-4, k=1 is made, and C1, L are obtained by minimum support1；
Step B-4-5, utilize item collection L1, obtain Candidate Set C2；Such as：By L1By property 1, candidate can be quickly obtained
Collect C2；
Step B-4-6, whenWhen, step B-4-7 is transferred to, is otherwise transferred to step B-4-9；
Step B-4-7, utilizes LkObtain Ck+1；Such as：By LkBy property 2, C can be quickly obtainedk+1；
Step B-4-8, judge Lk+2Whether it is empty, ifStep B-4-9 is then transferred to, is otherwise transferred to step B-4-
7；Such as：L can quickly be judged using property 3k+2Whether it is empty, ifStep B-4-9 is then transferred to, is otherwise transferred to step
Rapid B-4-7；
Step B-4-9, calculating terminate.
Wherein, property 1, property 2 and property 3 specifically can be understood as：
Although with Fuzzy Correlation rule mining algorithm (Mining Algorithms based on Fuzzy
Association Rules, MAFAR) then preferably attribute can be blurred and be excavated, but this method is still use
The thought of similar Apriori algorithm carries out the excavation and calculating of Frequent Set, thus also followed Apriori algorithm some not
Foot, especially when the support of Frequent Set and generation Candidate Set is calculated, time-consuming more, computational efficiency is relatively low.For with
Upper two problems, the present invention are improved to MAFAR, are provided a kind of based on the fast algorithm for mining for improving fuzzy association rules
(Fast Mining Algorithms based on Improved Fuzzy Association Rules, FMAIFAR), lead to
Cross be introduced into the property of Frequent Set simplify excavate in fuzzy support degree calculating and item collection between connection judgment, improve and excavate effect
Rate.
Property 1：To a K- item collection I, if comprising I [1], I [2] ..., I [K-1], I [k] affairs set is respectively
T1,T2,...,Tk, then the transaction set comprising I be combined intoProperty 1 shows that the affairs set comprising item collection is equal to comprising the item collection
The affairs of element are occured simultaneously.This property is introduced into Fuzzy Correlation excavation herein, its main thought is, in Fuzzy Correlation excavation
Frequent 1 item collection L is calculated first1, and according to L1Rearranged, things mark corresponding to item collection and item collection is included per a line
Knowledge and values of ambiguity.In generation C2When analysis carried out using property 1 to two item collections obtain common factor, further according to L1Carry out mould
The calculating of support is pasted, as long as so calculating support every time utilizes L1Solved without being repeatedly scanned with former database,
A large amount of save calculates the time.
Property 2：The random subset of one Frequent Item Sets must be Frequent Item Sets.Property 2 shows when progress item collection
During attended operation, it by subset can judge whether that Frequent Set can be generated.
Property 3：If LkL can be generatedk+1, it is assumed that LkIn item collection number be m, then must have m>k.Property 3 shows
It is no can be by LkGenerate Lk+1When, can be directly by LkIn item collection number judged.
In order to further illustrate mining process, briefly explained here with the contingency table example after a blurring
FMAIFAR operating procedure, initial data base are as shown in table 1：
Primary data after the blurring of table 1
It is first sorted out meeting that the item collection of (minsup=0.3) obtains Candidate Set C1, arranged by item collection as shown in table 2
The Candidate Set C of table 21
| Item collection | Fuzzy support degree | Transaction list |
| AH | {0.8,0.7,0.1,0.9,0.7,0.8} | {T1,T3,T4,T5,T7,T9} |
| BM | {0.8,0.5,0.9,0.7,0.1,0.8} | {T1,T3,T5,T7,T8,T9} |
| CM | {0.7,0.6,0.8,0.9,0.8} | {T1,T5,T6,T7,T10} |
| DH | {0.8,0.7,0.5,0.8,0.6} | {T4,T5,T7,T8,T9} |
| EH | {0.8,0.9,0.9,0.8,0.5,0.6} | {T1,T3,T5,T6,T7,T9} |
According to C1Seek candidate's 2- item collections C2, here to calculate the support of { AH, BM } exemplified by, ask first comprising { AH, BM }
Things set:{ T1, T3, T4, T5, T7, T9 } ∩ { T1, T3, T5, T7, T8, T9 }={ T1, T3, T5, T7, T9 }, then root again
According to C1The fuzzy support degree of middle corresponding item collection seeks the minimum common factor between each item collection, sup { AH, BM }=0.37 is obtained, using same
The method of sample can calculate all 2- item collections, obtain candidate's 2- item set C2, and frequent 2- items are obtained according to fuzzy support degree
Collect L2, as shown in table 3：
The Frequent Set L of table 32
| Item collection | AH,BM | AH,CM | AH,EH | BM,CM | BM,EH | CM,EH |
| Fuzzy support degree | 0.37 | 0.30 | 0.35 | 0.30 | 0.33 | 0.31 |
It can be seen that by the introducing of property 1, simplification has been calculated in support, as long as the calculating of all supports exists
C1It is scanned in item collection, and C1Deleting for substantial amounts of redundancy, therefore calculating speed have been carried out compared to initial data base
Accelerate, with the increase of database item data, simplify the effect calculated and will be apparent from.
Obtaining L2Afterwards, to L2It is attached operation and obtains candidate's 3- item collections, C after connection3It is expressed as：C3=(AH,
BM, CM), (AH, BM, EH), (AH, CM, EH), (AH, BH, EH), (BM, CM, EH), (BM, CM, EH) }, to C3Beta pruning is carried out to obtain
To candidate's 3- item collections C'3={ (AH, BM, CM), (AH, CM, EH), (BM, CM, EH) }, it is clear that frequent 3- is generated using connection
Item collection will pass through connection and subtract branch, and need to scan initial data base, be calculated when data volume is larger quite time-consuming.Lead to herein
Introducing property 2 is crossed, can quickly obtain frequent 3- item collections, specific practice is：To L2Middle Section 1 identical item collection is combined,
Such as to { (AH, BM), (AH, CM) }, as long as now judging (BM, CM) ∈ L2, (AH, BM, CM) must be frequent if setting up
3- item collections, because all subitems are all frequent item sets.As long as therefore judged by 3 steps, with regard to C can be obtained3, and need not be again
Initial data base is scanned, as long as scanning L2.Finally by L3Generate L4When, can direct character of use 3, due to L3In
The number of item collection is L3=3<4, therefore without judging directly obtainAnalysis more than is it is recognised that by three
Individual property, which is incorporated into during Fuzzy Correlation is excavated, can improve computational efficiency, as shown in Figure 5 the step of specific algorithm.
By introducing short-term bus load prediction data and prediction curve being divided by given peak valley threshold values, so as to obtain
The period subregion of equipment is obtained, similarity ratio secondly is carried out to data set in the identical period in period internal loading curve and database
Compared with the reasonable distribution number of parameter being obtained eventually through improved Fuzzy Correlation fast algorithm for mining, so as to realize idle work optimization
The automatically and reasonably setting of parameter in On-line Control, idle work optimization is improved in line traffic control while operations staff's working strength is mitigated
The effect of system.
Further, in the present embodiment, a kind of idle work optimization key parameter of rule-based screening strategy is also provided to distinguish
Knowledge scheme, as shown in Figure 6, Strong association rule is excavated by using association mining method, and combine Strong association rule screening plan
Redundancy rule in Strong association rule is slightly effectively rejected, realizes the automatic precisely identification of key parameter in idle work optimization.
Specifically in the step B-6, Rules Filtering is carried out using Strong association rule screening strategy, including：
First according to the priority relationship between attribute, further according to the priority relationship in attribute, to excavating the strong association obtained
Regular collection according to priority screened one by one by relation, Strong association rule and output after being screened.
Wherein：
Priority between attribute includes：Burden with power (PSN)>Voltage gets over line number>Load or burden without work>Voltage deviation；
Priority in attribute includes：It is active very dissimilar<Active dissmilarity<It is active somewhat like<It is active more similar<
It is active closely similar, idle very dissimilar<Idle dissmilarity<It is idle somewhat like<It is idle more similar<It is idle it is closely similar,
Busbar voltage deviation is larger<Busbar voltage has certain deviation<Busbar voltage deviation is smaller, out-of-limit number is more<Out-of-limit number compared with
It is few<Without it is out-of-limit, gear action frequency is more<Gear action frequency is normal<Gear action frequency is less, capacitor switching number compared with
It is more<Capacitor switching number is normal<Capacitor switching number is less.
Each embodiment in this specification is described by the way of progressive, identical similar portion between each embodiment
Divide mutually referring to what each embodiment stressed is the difference with other embodiment.It is real especially for equipment
For applying example, because it is substantially similar to embodiment of the method, so describing fairly simple, related part is referring to embodiment of the method
Part explanation.The foregoing is only a specific embodiment of the invention, but protection scope of the present invention is not limited to
This, any one skilled in the art the invention discloses technical scope in, the change that can readily occur in or replace
Change, should all be included within the scope of the present invention.Therefore, protection scope of the present invention should be with the protection model of claim
Enclose and be defined.
Claims (9)
- A kind of 1. parameters analysis method for being used for control device in power system, it is characterised in that according to the sequencing of execution, Including：Data preparation stage, the rank excavated calculating and regular generation phase and parameter setting result is obtained according to rule before excavation Section；Wherein：Include before excavation described in A the step of data preparation stage：Step A-1, obtain the bus load prediction result required for excavating；Step A-2, bus load prediction data is divided automatically and obtains the period section needed for excavating；Step A-3, associate field needed for excavating is chosen, and arrangement is performed to day part data in history library；Excavate to calculate described in B includes with the step of regular generation phase：Step B-1, the history library result in i-th of period is chosen, and change field attribute；Step B-2, calculate between i period internal loading prediction curves and history library set, the similarity of different field attribute；Step B-3, each attribute respective value is quantified using fuzzy membership function；Step B-4, excavated using Mining fuzzy association rules method；Step B-5, obtain the Strong association rule for meeting confidence level and interest-degree；Step B-6, passes through i<li,maxJudge whether all periods all excavate to complete, C-1 is transferred to if all excavating and completing, it is no Then it is transferred to B-1, wherein li,maxThe maximum of present period is represented, i represents the numbering of marked off period, 1≤i≤max；The step of obtaining the stage of parameter setting result according to rule described in C includes：Step C-1, anti fuzzy method processing is carried out to correlation rule, obtain equipment Time segments division and action frequency sets result；Step C-2, this excavates calculating and terminated.
- 2. according to the method for claim 1, it is characterised in that the step A-2 includes：A-2-1, read in bus load prediction curve data；A-2-2, set the peak valley number threshold values N of bus load prediction curve；A-2-3, the bus load prediction data is arranged by ascending order, obtain the ascending order arrangement of the bus load prediction data Set S；A-2-4, choose in set S in preceding F data deposit set SF, wherein, set SF is to include the data in set S Subset, in default situations F=3；A-2-5, by the A-2-3 gained put in order, two number SF in set of computations SFi,tAnd SFi+1,tBetween time Interval, if SFi,t-SFi+1,t≤ δ (i=1 ..., F-1), wherein, δ is setting threshold values, δ=3 under default situations, then set up and A-2-6 is transferred to, is otherwise transferred to A-2-7, SFi,tRepresent i-th of number, SF in set SFi+1,tRepresent i+1 number in set SF；A-2-6, SF is deleted in set SFi+1,tAnd supplement SN+1Into set SF, A-2-5, S are transferred toN+1Represent N+ in set S 1 number；A-2-7, the bus load prediction data is arranged in descending order, obtain the descending arrangement of the bus load prediction data Set J；A-2-8, choose in set J in preceding G data deposit set JG, wherein, set JF is to include the data in set J Subset, in default situations G=2；A-2-9, in order two number JG in set of computations JGi,tAnd JGi+1,tBetween time interval, if JGi,t-JGi+1,t≤δ (i=1 ..., G-1), then set up and be transferred to A-2-10, be otherwise transferred to A-2-11, JGi,tAnd JGi+1,tRepresent respectively in set JG I-th and i+1 number；A-2-10, JG is deleted in set JGi+1,tAnd supplement SN+1Into set JG, A-2-9 is transferred to；A-2-11, merge set SF and JG, and according to time sequence generate new set SHFi,t(i=1 ..., G+F), and will collection Close SHFi,tIn be a Time segments division between two neighboring number, be transferred to A-2-12；A-2-12, the step A-2 terminate.
- 3. according to the method for claim 1, it is characterised in that in the step A-3：Associated characters needed for selected excavation Specifically field is section：The date field for representing the date, the field, expression burden with power or the load or burden without work that represent current time Field, represent busbar voltage value field, indication transformer gear value field, represent compensation equipment switching state.
- 4. according to the method for claim 1, it is characterised in that in the step B-1, the field attribute bag changed Include：" bus voltage value " is converted to " voltage gets over line number " and " voltage deviation "；" transformer gear value " is converted to " transformer action number "；" compensation equipment switching state " is converted to " compensation number of equipment action ".
- 5. according to the method for claim 4, it is characterised in that in the step B-3：Connection attribute is changed into by Category Attributes using membership function in fuzzy mathematics, fuzzy language corresponding to each attribute is successively For：Active and load or burden without work be defined as very dissimilar (SN), dissimilar (N), somewhat like (S), more similar (B), very Similar (HB) }；Busbar voltage deviation definition is { deviation is smaller (L), there is certain deviation (M), and deviation is larger (H) }；Voltage out-of-limit number is defined as { without out-of-limit, out-of-limit number is less, and out-of-limit number is more }；Gear action frequency number is defined as { less, normally, more }；Capacitor switching number number is defined as { less, normally, more }.
- 6. according to the method for claim 1, it is characterised in that in the step B-2, including：B-2-1, i Time segments division of bus load prediction is obtained, and the data in i period are saved in set GiIn；B-2-2, history library record is read, and be stored in set D；B-2-3, calculate GiGather interior element number, and be designated as m_Gi；B-2-4, obtain in period i, j-th strip data acquisition system D in the set Dij, and calculate DijMiddle element number, and it is designated as m_ Dij；B-2-5, judge m_GiAnd m_DijIt is whether equal, if m_Gi=m_DijSimilarity is then calculated using standardization ED distances, Otherwise similarity is calculated using standardization DTW distances；B-2-6, the similarity between being gathered, if j<lj,maxJ=j+1 is then made, and is transferred to B-2-4, is otherwise transferred to B-2-7；B-2-7, complete the calculating of similarity between all set in the i periods；B-2-8, if i<li,maxI=i+1 is then made, B-2-3 is transferred to, is otherwise transferred to B-2-9；Similarity Measure in B-2-9, the step B-2 terminates.
- 7. according to the method for claim 1, it is characterised in that also include：In the step B-4, excavated using quick Algorithm is excavated；The fast algorithm for mining includes：Step B-4-1, input data set；Step B-4-2, Fuzzy processing is carried out to the data in attribute in the data set using selected membership function；Step B-4-3, calculate the fuzzy support degree that Fuzzy divide is corresponded in each item collection；Step B-4-4, k=1 is made, and C is obtained by minimum support1,L1；Step B-4-5, utilize item collection L1, obtain Candidate Set C2；Step B-4-6, whenWhen, step B-4-7 is transferred to, is otherwise transferred to step B-4-9；Step B-4-7, utilizes LkObtain Ck+1；Step B-4-8, judge Lk+2Whether it is empty, ifStep B-4-9 is then transferred to, is otherwise transferred to step B-4-7；Step B-4-9, calculating terminate.
- 8. according to the method for claim 7, it is characterised in that also include：In the step B-6, advised using strong association Then screening strategy carries out Rules Filtering, including：First according to the priority relationship between attribute, further according to the priority relationship in attribute, to excavating the Strong association rule obtained According to priority relation is screened one by one for set, Strong association rule and output after being screened.
- 9. according to the method for claim 8, it is characterised in that the priority between attribute includes：Burden with power (PSN)>Electricity Pressure gets over line number>Load or burden without work>Voltage deviation；Priority in attribute includes：It is active very dissimilar<Active dissmilarity<It is active somewhat like<It is active more similar<It is active It is closely similar, idle very dissimilar<Idle dissmilarity<It is idle somewhat like<It is idle more similar<Idle closely similar, bus Voltage deviation is larger<Busbar voltage has certain deviation<Busbar voltage deviation is smaller, out-of-limit number is more<Out-of-limit number is less<Nothing It is out-of-limit, gear action frequency is more<Gear action frequency is normal<Gear action frequency is less, capacitor switching number is more<Electricity Container switching frequency is normal<Capacitor switching number is less.
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