CN110133365A - A kind of detection method and device of the switch events of load - Google Patents

A kind of detection method and device of the switch events of load Download PDF

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CN110133365A
CN110133365A CN201910352779.6A CN201910352779A CN110133365A CN 110133365 A CN110133365 A CN 110133365A CN 201910352779 A CN201910352779 A CN 201910352779A CN 110133365 A CN110133365 A CN 110133365A
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cluster
power signal
signal sequence
sequence
current
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翟明岳
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Guangdong University of Petrochemical Technology
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Guangdong University of Petrochemical Technology
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R21/00Arrangements for measuring electric power or power factor
    • G01R21/001Measuring real or reactive component; Measuring apparent energy
    • G01R21/002Measuring real component
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere

Abstract

The embodiment of the present invention discloses the detection method and device of a kind of switch events of load, which comprises inputs the first power signal sequence of the load of actual measurement;It obtains the second power signal sequence: setting 1 for the current value of serial number i;Choose i-th of element Δ P (i) in the second power signal sequence Δ P;It generates and investigates sequence Γ;Calculate the difference of each element in q (i) and the investigation sequence Γ;Cluster vector Ε is constituted, whenWhen, then q (i) is labeled as the current cluster heart;If the current cluster heart q (i) has been marked as cluster point or current cluster point has been marked as cluster point or the cluster heart, the current cluster heart q (i) and the current cluster point are added to existing cluster;Otherwise, a new cluster Ω is builtj.1 processing is added to the value of the serial number i;As i≤N, then jumps to step 4 and continue iteration;According to the cluster ΩjIn number, judge it is described load whether have switch events.

Description

A kind of detection method and device of the switch events of load
Technical field
The present invention relates to smart grid field more particularly to a kind of detection methods and device of the switch events of load.
Background technique
With the development of smart grid, the analysis of household electricity load is become more and more important.Pass through point of power load Analysis, domestic consumer can obtain the power information of each electric appliance and the fining inventory of the electricity charge in time;Power department can obtain More detailed user power utilization information is obtained, and the accuracy of electro-load forecast can be improved, provides overall planning for power department Foundation.Meanwhile using the power information of each electric appliance, would know that the electricity consumption behavior of user, this for family's energy consumption assessment and The research of Energy Saving Strategy has directive significance.
Current power load decomposition is broadly divided into two methods of intrusive load decomposition and non-intrusion type load decomposition.It is non-to invade Enter formula load decomposition method not needing that monitoring device is installed in the power inside equipment of load, it is only necessary to total according to power load Information can be obtained the information on load of each electrical equipment.Non-intrusion type load decomposition method has less investment, convenient to use etc. Feature, therefore, this method are suitable for the decomposition of family's load electricity consumption.
In non-intrusion type load decomposition algorithm, the switch events detection of electrical equipment is most important one link.Initially Judgment basis of the event detection using the changing value Δ P of active-power P as event detection, it is convenient and intuitive.This is because appointing The operating status of what electrical equipment changes, and consumed performance number also necessarily changes, and the change It will be embodied in the general power consumed by all electric appliances.Reasonable threshold of this method in addition to needing to be arranged power change values Value, it is also necessary to solve the problems, such as that event detecting method exists in practical applications: the instantaneous power value at certain appliance starting moment It will appear biggish spike (for example, motor start-up current is much larger than rated current), will cause electric appliance steady state power changing value not Accurately, to influence the judgement to switch events, this spike is exactly impulsive noise in fact;And the transient state of different household electrical appliance Process or length are short (duration of impulsive noise and occurrence frequency difference larger), thus the determination of power change values become compared with For difficulty;It the case where mutation will appear due to variation (such as voltage die) active power of power quality, is likely to out in this way Now judge by accident.The distribution situation of noise (including impulsive noise) in the power signal (or referred to as power data sequence) of actual measurement In, the intensity of (pulse) noise is very big, and ambient noise has large effect to the correct detection of switch events.
Therefore, in switch events detection process, how to improve switch events detection accuracy and be very important.
The deficiency of existing switch events detection method:
Existing frequently-used load switch event often utilizes the variation of power data to determine: when power change values are more than pre- When the threshold value set, then it is assumed that have load switch event.This method is although simple and easy, but due to impulsive noise and non- The generally use of linear load, causes the considerable decrease of switch events detection accuracy.
Load switch event detection is a step mostly important in Energy Decomposition, should detect event, simultaneously also At the time of can determine that event occurs.But switch events detection precision by noise in power signal (power sequence) influenced compared with Greatly, detection accuracy is further affected in the prevalence of impulsive noise especially in power signal.Therefore load is effectively improved to open The detection accuracy of pass event is a current very important job.
Existing frequently-used load switch event often utilizes the variation of power data to determine: when power change values are more than pre- When the threshold value set, then it is assumed that have load switch event.This method is although simple and easy, but due to impulsive noise and non- The generally use of linear load, causes the considerable decrease of switch events detection accuracy.
Summary of the invention
In view of this, the embodiment of the present invention provides a kind of detection method of the switch events of load and device can be improved inspection Survey precision.
A kind of detection method of the switch events of load, comprising:
Step 1, the first power signal sequence p (1), p (2) ..., the p (N) of the load of actual measurement are obtained, p (N+1), N+1 are The length of power signal sequence;
Step 2, the latter data in the first power signal sequence are subtracted into previous data, obtains the second power Signal sequence: the length of Δ P=[p (2)-p (1), p (3)-p (2) ..., p (N+1)-p (N)], Δ P are N;
Step 3,1 is set by the current value of serial number i;
Step 4, i-th of element Δ P (i) in the second power signal sequence Δ P is chosen, q (i) is denoted as, Q (i)=Δ P (i);
Step 5, it according to the second power signal sequence Δ P, generates and investigates sequence Γ;
Step 6, the difference of each element in q (i) and the investigation sequence Γ is calculated;From the element for investigating sequence Γ In, the element that difference is less than or equal to threshold value R is chosen, cluster vector Ε, Ε=[Δ p (e are constituted1),Δp(e2),…,Δp (eC)], c=1,2 ..., C;
Step 7, whenWhen, then q (i) is labeled as the current cluster heart, and by the cluster vector Ε=[Δ p (e1), Δp(e2),…,Δp(eC)] in all the points be labeled as current cluster point;In formula,It indicates to being rounded on *;
Step 8, if the current cluster heart q (i) has been marked as cluster point or the current cluster point has been marked as cluster Point or the cluster heart, then by the current cluster heart q (i) and the current cluster point Ε=[Δ p (e1),Δp(e2),…,Δp(eC)] It is added to existing cluster;Otherwise, a new cluster Ω is builtj
Step 9,1 processing is added to the value of the serial number i;As i≤N, then jumps to step 4 and continue iteration;Otherwise, iteration knot Beam;After iteration, a series of clusters: Ω are obtained1, Ω2,…,ΩD
Step 10, according to the cluster ΩjIn number, judge it is described load whether have switch events.
A kind of detection device of the switch events of load, comprising:
Acquiring unit inputs the first power signal sequence p (1), p (2) ..., the p (N) of the load of actual measurement, p (N+1), N+1 For the length of power signal sequence;
The latter data in the first power signal sequence are subtracted previous data, obtained by the first computing unit Second power signal sequence: the length of Δ P=[p (2)-p (1), p (3)-p (2) ..., p (N+1)-p (N)], Δ P are N;
Setting unit sets 1 for the current value of serial number i;
Selecting unit chooses i-th of element Δ P (i) in the second power signal sequence Δ P, is denoted as q (i), q (i)=Δ P (i);
Generation unit generates according to the second power signal sequence Δ P and investigates sequence Γ;
Second computing unit calculates the difference of each element in q (i) and the investigation sequence Γ;From the investigation sequence In the element of Γ, the element that difference is less than or equal to threshold value R is chosen, constitutes cluster vector Ε, Ε=[Δ p (e1),Δp (e2),…,Δp(eC)], c=1,2 ..., C;
Marking unit, whenWhen, then q (i) is labeled as the current cluster heart, and by cluster vector Ε=[the Δ p (e1),Δp(e2),…,Δp(eC)] in all the points be labeled as current cluster point;In formula,It indicates to being rounded on *;
Adding unit, if the current cluster heart q (i) has been marked as cluster point or current cluster point is labeled For cluster point or the cluster heart, then by the current cluster heart q (i) and the current cluster point Ε=[Δ p (e1),Δp(e2),…,Δp (eC)] it is added to existing cluster;Otherwise, a new cluster Ω is builtj
Third computing unit adds 1 processing to the value of the serial number i;As i≤N, then jumps to step 4 and continue iteration;Otherwise, Iteration terminates;After iteration, a series of clusters: Ω are obtained1, Ω2,…,ΩD
Judging unit, according to the cluster ΩjIn number, judge it is described load whether have switch events.
The present invention proposes a kind of new load switch event detecting method, and the difference of power signal and impulsive noise is utilized It is different, by carrying out the influence that point group handles elimination noise to power signal.On this basis, the ownership for dividing signal after group is utilized Relationship determines load switch event, improves event detection precision.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with Other attached drawings are obtained according to these attached drawings.
Fig. 1 is the schematic diagram of the detection method for the switch events that the embodiment of the present invention carries;
Fig. 2 is the schematic diagram of the detection method of the switch events loaded in application scenarios of the present invention;
Fig. 3 is the connection schematic diagram of the detection device of the embodiment of the present invention switch events.
Specific embodiment
The embodiment of the present invention is described in detail with reference to the accompanying drawing.
It will be appreciated that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.Base Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts it is all its Its embodiment, shall fall within the protection scope of the present invention.
For convenience of description, description apparatus above is to be divided into various units/modules with function to describe respectively.Certainly, exist Implement to realize each unit/module function in the same or multiple software and or hardware when the present invention.
Term is explained:
Load switch event: the movement opening load (electrical equipment) power switch or turning off the power switch
Energy Decomposition: the performance number read at ammeter is decomposed into performance number consumed by single load.
As shown, being a kind of detection method of the switch events of load of the present invention, comprising:
Step 11, the first power signal sequence p (1), p (2) ..., the p (N) of the load of actual measurement, p (N+1), N+1 are obtained For the length of power signal sequence;
Step 12, the latter data in the first power signal sequence are subtracted into previous data, obtains the second function Rate signal sequence: the length of Δ P=[p (2)-p (1), p (3)-p (2) ..., p (N+1)-p (N)], Δ P are N;
Step 13,1 is set by the current value of serial number i;
Step 14, i-th of element Δ P (i) in the second power signal sequence Δ P is chosen, q (i) is denoted as, Q (i)=Δ P (i);
Step 15, it according to the second power signal sequence Δ P, generates and investigates sequence Γ;The step 5 includes: to choose The n-th -30 to the n-th+30 elements, which are used as, in the second power signal sequence Δ P investigates sequence Γ, and Γ=[Δ P (n-30), ΔP(n-29),…,ΔP(n),…,ΔP(n+29),ΔP(n+30)]。
Step 16, the difference of each element in q (i) and the investigation sequence Γ is calculated;From the member for investigating sequence Γ In element, the element that difference is less than or equal to threshold value R is chosen, constitutes cluster vector Ε, Ε=[Δ p (e1),Δp(e2),…,Δp (eC)], c=1,2 ..., C;The step 6 further include: when Δ P (n-k) is not present, then using Δ P (n) as the investigation sequence In corresponding element.
Step 17, whenWhen, then q (i) is labeled as the current cluster heart, and by cluster vector Ε=[the Δ p (e1),Δp(e2),…,Δp(eC)] in all the points be labeled as current cluster point;In formula,It indicates to being rounded on *;The step Rapid 7 further include:
Calculate the threshold value, the threshold value R=0.61 δ;δ is the mean square deviation of the second power signal sequence.
Before the step 1 rapid 7, the method also includes:
Calculate the mean value and mean square deviation of the second power signal sequence;
Mean value
Mean square deviation
Step 18, if the current cluster heart q (i) has been marked as cluster point or the current cluster point has been marked as Cluster point or the cluster heart, then by the current cluster heart q (i) and the current cluster point Ε=[Δ p (e1),Δp(e2),…,Δp (eC)] it is added to existing cluster;Otherwise, a new cluster Ω is builtj
Step 19,1 processing is added to the value of the serial number i;As i≤N, then jumps to step 4 and continue iteration;Otherwise, iteration knot Beam;After iteration, a series of clusters: Ω are obtained1, Ω2,…,ΩD
Step 110, according to the cluster ΩjIn number, judge it is described load whether have switch events.Step 10 packet It includes: if cluster ΩjIn element number be less thanThen judge cluster Ωj={ Δ P (j1),ΔP(j2),…,ΔP(jJ) in Point Δ P (j1),ΔP(j2),…,ΔP(jJ) correspond to switch events;J=1,2 ..., D.
The present invention proposes a kind of new load switch event detecting method, and the difference of power signal and impulsive noise is utilized It is different, by carrying out the influence that point group handles elimination noise to power signal.On this basis, the ownership for dividing signal after group is utilized Relationship determines load switch event, improves event detection precision.The method proposed has preferable robustness, calculates letter It is single.
Application scenarios are described below.The flow chart of this algorithm is shown in Fig. 2, which comprises
1. input data
Power signal sequence p (1), the p (2) of actual measurement are inputted ..., p (N), p (N+1), N+1 are the length of power signal sequence Degree.
2. data convert
The latter data subtract previous data, obtain new data vector:
Δ P=[p (2)-p (1), p (3)-p (2) ..., p (N+1)-p (N)]
The length of data sequence Δ P is N. at this time
3. calculating mean value and mean square deviation
Mean value
Mean square deviation
4. starting counting: i=1
5. choose data sequence Δ P in i-th of element Δ P (i) be used as current point, it is expressed as again q (i)= ΔP(i)。
6. choose in data sequence Δ P the n-th -30 to the n-th+30 elements as investigate sequence Γ=[Δ P (n-30), ΔP(n-29),…,ΔP(n),…,ΔP(n+29),ΔP(n+30)].Note: if Δ P (n-k) is not present, with Δ P (n) Instead of.
Such as: n=10, k=20 then investigate Δ P (n-20)=Δ P (10-20)=Δ P (10) in sequence.
7. calculating q (i) and investigating the difference of each element in sequence Γ, the element that difference is less than R=0.61 δ, structure are chosen Cluster vector Ε=[Δ p (e1),Δp(e2),…,Δp(eC)], the element in cluster vector meets: | Δ p (ec)-q(i)|≤ R, c=1,2 ..., C.Cluster vector shares C element.
8. qualitative:
IfQ (i) is then labeled as the cluster heart, cluster vector Ε=[Δ p (e1),Δp(e2),…,Δp(eC)] In all the points be labeled as cluster point.In formula,It indicates to being rounded on *.
9. if cluster heart q (i) has been marked as cluster point or current cluster point has been marked as cluster point or the cluster heart, when Prevariety heart q (i) and current cluster point Ε=[Δ p (e1),Δp(e2),…,Δp(eC)] it is added to existing cluster;Otherwise, it is new to build one Cluster Ωj
10. counting: i=i+1.If i≤N+1, goes to step 5 and continue iteration.
11. after iteration, obtaining a series of clusters: Ω1, Ω2,…,ΩD.If cluster ΩjMember in (j=1,2 ..., D) Plain number is less thanThen cluster Ωj={ Δ P (j1),ΔP(j2),…,ΔP(jJ) in point Δ P (j1),ΔP (j2),…,ΔP(jJ) correspond to switch events.The flow chart of this algorithm is shown in Fig. 2
Common algorithm determines load switch event according to changed power, and major defect is impulsive noise and non-linear Load will cause the mistake of switch events detection.The present invention proposes a kind of new load switch event detecting method.It is proposed The difference of power signal and impulsive noise is utilized in method, by carrying out the influence that point group handles elimination noise to power signal. On this basis, using dividing the attaching relation of signal after group to determine load switch event, event detection precision is improved.It is mentioned Method out has preferable robustness, calculates simple.
As shown in figure 3, being a kind of detection device of the switch events of load of the present invention, comprising:
Acquiring unit 31 inputs the first power signal sequence p (1), p (2) ..., p (N), the p (N+1) of the load of actual measurement, N+1 is the length of power signal sequence;
The latter data in the first power signal sequence are subtracted previous data, obtained by the first computing unit 32 It is N to the second power signal sequence: the length of Δ P=[p (2)-p (1), p (3)-p (2) ..., p (N+1)-p (N)], Δ P;
Setting unit 33 sets 1 for the current value of serial number i;
Selecting unit 34 chooses i-th of element Δ P (i) in the second power signal sequence Δ P, is denoted as q (i), q (i)=Δ P (i);
Generation unit 35 generates according to the second power signal sequence Δ P and investigates sequence Γ;
Second computing unit 36 calculates the difference of each element in q (i) and the investigation sequence Γ;From the investigation sequence In the element for arranging Γ, the element that difference is less than or equal to threshold value R is chosen, constitutes cluster vector Ε, Ε=[Δ p (e1),Δp (e2),…,Δp(eC)], c=1,2 ..., C;
Marking unit 37, whenWhen, then q (i) is labeled as the current cluster heart, and by cluster vector Ε=[the Δ p (e1),Δp(e2),…,Δp(eC)] in all the points be labeled as current cluster point;In formula,It indicates to being rounded on *;
Adding unit 38, if the current cluster heart q (i) has been marked as cluster point or current cluster point has been marked It is denoted as cluster point or the cluster heart, then by the current cluster heart q (i) and the current cluster point Ε=[Δ p (e1),Δp(e2),…,Δp (eC)] it is added to existing cluster;Otherwise, a new cluster Ω is builtj
Third computing unit 39 adds 1 processing to the value of the serial number i;As i≤N, then jumps to step 4 and continue iteration;It is no Then, iteration terminates;After iteration, a series of clusters: Ω are obtained1, Ω2,…,ΩD
Judging unit 310, according to the cluster ΩjIn number, judge it is described load whether have switch events.
The generation unit specifically:
It chooses the n-th -30 to the n-th+30 elements in the second power signal sequence Δ P and is used as investigation sequence Γ, Γ =[Δ P (n-30), Δ P (n-29) ..., Δ P (n) ..., Δ P (n+29), Δ P (n+30)].
Those of ordinary skill in the art will appreciate that realizing all or part of the process in above-described embodiment method, being can be with Relevant hardware is instructed to complete by computer program, the program can be stored in a computer-readable storage medium In, the program is when being executed, it may include such as the process of the embodiment of above-mentioned each method.Wherein, the storage medium can be magnetic Dish, CD, read-only memory (Read-Only Memory, ROM) or random access memory (Random Access Memory, RAM) etc..
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, any In the technical scope disclosed by the present invention, any changes or substitutions that can be easily thought of by those familiar with the art, all answers It is included within the scope of the present invention.Therefore, protection scope of the present invention should be subject to the protection scope in claims.

Claims (9)

1. a kind of detection method of the switch events of load characterized by comprising
Step 1, the first power signal sequence p (1) of the load of actual measurement is obtained, p (2) ..., p (N), p (N+1), N+1 are power The length of signal sequence;
Step 2, the latter data in the first power signal sequence are subtracted into previous data, obtains the second power signal Sequence: the length of Δ P=[p (2)-p (1), p (3)-p (2) ..., p (N+1)-p (N)], Δ P are N;
Step 3,1 is set by the current value of serial number i;
Step 4, i-th of element Δ P (i) in the second power signal sequence Δ P is chosen, q (i), q (i) are denoted as =Δ P (i);
Step 5, it according to the second power signal sequence Δ P, generates and investigates sequence Γ;
Step 6, the difference of each element in q (i) and the investigation sequence Γ is calculated;From the element for investigating sequence Γ, The element that difference is less than or equal to threshold value R is chosen, cluster vector Ε, Ε=[Δ p (e are constituted1),Δp(e2),…,Δp(eC)], C=1,2 ..., C;
Step 7, when a predetermined condition is satisfied, then q (i) is labeled as the current cluster heart, and by the cluster vector Ε=[Δ p (e1), Δp(e2),…,Δp(eC)] in all the points be labeled as current cluster point;In formula,It indicates to being rounded on *;
Step 8, when the current cluster heart q (i) has been marked as cluster point or the current cluster point have been marked as cluster point or When the cluster heart, then by the current cluster heart q (i) and the current cluster point Ε=[Δ p (e1),Δp(e2),…,Δp(eC)] be added To existing cluster;Otherwise, a new cluster Ω is builtj
Step 9,1 processing is added to the value of the serial number i;As i≤N, then jumps to step 4 and continue iteration;Otherwise, iteration terminates;Repeatedly After generation, a series of clusters: Ω are obtained1, Ω2,…,ΩD
Step 10, according to the cluster ΩjIn number, judge it is described load whether have switch events.
2. the method according to claim 1, wherein the step 5 includes:
It chooses the n-th -30 to the n-th+30 elements in the second power signal sequence Δ P and is used as investigation sequence Γ, Γ=[Δ P(n-30),ΔP(n-29),…,ΔP(n),…,ΔP(n+29),ΔP(n+30)]。
3. the method according to claim 1, wherein the step 6 further include:
When Δ P (n-k) is not present, then using Δ P (n) as the corresponding element investigated in sequence.
4. the method according to claim 1, wherein the step 7 further include:
Calculate the threshold value, the threshold value R=0.61 δ;δ is the mean square deviation of the second power signal sequence.
5. according to the method described in claim 4, it is characterized in that, before the step 7, the method also includes:
Calculate the mean value and mean square deviation of the second power signal sequence;
Mean value
Mean square deviation
6. the method according to claim 1, wherein the step 10 includes:
If cluster ΩjIn element number be less thanThen judge cluster Ωj={ Δ P (j1),ΔP(j2),…,ΔP(jJ) in Point Δ P (j1),ΔP(j2),…,ΔP(jJ) correspond to switch events;J=1,2 ..., D.
7. the method according to claim 1, wherein the predetermined condition in the step 7 includes:
8. a kind of detection device of the switch events of load characterized by comprising
Acquiring unit inputs the first power signal sequence p (1) of the load of actual measurement, and p (2) ..., p (N), p (N+1), N+1 are function The length of rate signal sequence;
The latter data in the first power signal sequence are subtracted previous data, obtain second by the first computing unit Power signal sequence: the length of Δ P=[p (2)-p (1), p (3)-p (2) ..., p (N+1)-p (N)], Δ P are N;
Setting unit sets 1 for the current value of serial number i;
Selecting unit chooses i-th of element Δ P (i) in the second power signal sequence Δ P, is denoted as q (i), q (i)=Δ P (i);
Generation unit generates according to the second power signal sequence Δ P and investigates sequence Γ;
Second computing unit calculates the difference of each element in q (i) and the investigation sequence Γ;Investigate sequence Γ's from described In element, the element that difference is less than or equal to threshold value R is chosen, constitutes cluster vector Ε, Ε=[Δ p (e1),Δp(e2),…,Δ p(eC)], c=1,2 ..., C;
Marking unit, whenWhen, then q (i) is labeled as the current cluster heart, and by the cluster vector Ε=[Δ p (e1),Δ p(e2),…,Δp(eC)] in all the points be labeled as current cluster point;In formula,It indicates to being rounded on *;
Adding unit, if the current cluster heart q (i) has been marked as cluster point or current cluster point has been marked as cluster Point or the cluster heart, then by the current cluster heart q (i) and the current cluster point Ε=[Δ p (e1),Δp(e2),…,Δp(eC)] It is added to existing cluster;Otherwise, a new cluster Ω is builtj
Third computing unit adds 1 processing to the value of the serial number i;As i≤N, then jumps to step 4 and continue iteration;Otherwise, iteration Terminate;After iteration, a series of clusters: Ω are obtained1, Ω2,…,ΩD
Judging unit, according to the cluster ΩjIn number, judge it is described load whether have switch events.
9. device according to claim 8, which is characterized in that the generation unit specifically:
It chooses the n-th -30 to the n-th+30 elements in the second power signal sequence Δ P and is used as investigation sequence Γ, Γ=[Δ P(n-30),ΔP(n-29),…,ΔP(n),…,ΔP(n+29),ΔP(n+30)]。
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