CN106054104B - A kind of intelligent electric meter failure real-time predicting method based on decision tree - Google Patents

A kind of intelligent electric meter failure real-time predicting method based on decision tree Download PDF

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Publication number
CN106054104B
CN106054104B CN201610342042.2A CN201610342042A CN106054104B CN 106054104 B CN106054104 B CN 106054104B CN 201610342042 A CN201610342042 A CN 201610342042A CN 106054104 B CN106054104 B CN 106054104B
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China
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electricity
failure
ammeter
intelligent electric
formula
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CN201610342042.2A
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CN106054104A (en
Inventor
李宁
袁铁江
杨金成
蒋平
王刚
董小顺
罗庆
李国军
薛飞
段志尚
山宪武
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国网新疆电力公司电力科学研究院
新疆大学
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R35/00Testing or calibrating of apparatus covered by the preceding groups
    • G01R35/04Testing or calibrating of apparatus covered by the preceding groups of instruments for measuring time integral of power or current

Abstract

A kind of intelligent electric meter failure real-time predicting method based on decision tree, step are as follows: 1, to the intelligent electric meter data prediction of power information acquisition system;2, according to intelligent electric meter breakdown judge model, the faulty data of intelligent electric meter of power information acquisition system are screened into intelligent electric meter Mishap Database;3, the historical data in intelligent electric meter Mishap Database is divided into training set and test set, data mining is carried out to training set using decision Tree algorithms, forms intelligent electric meter failure decision tree and preliminary classification rule;4, accuracy assessment is carried out to preliminary classification rule by the data of test set, if accuracy is met the requirements, it is determined that classifying rules returns to training set, re -training if being unsatisfactory for requiring;5, intelligent electric meter failure real-time prediction model is generated by the classifying rules finally determined;6, intelligent electric meter real time fail data basd link is connected to intelligent electric meter failure real-time prediction model to be predicted in real time, obtains the real-time prediction result of intelligent electric meter failure.

Description

A kind of intelligent electric meter failure real-time predicting method based on decision tree

Technical field

The present invention relates to a kind of intelligent electric meter failure prediction method, in particular to a kind of intelligent electric meter event based on decision tree Hinder real-time predicting method.

Background technique

With the deep propulsion of State Grid Corporation of China " three collection five are big " System Construction, the power information that " big marketing " is promoted is adopted Collecting system construction has had scale, especially intelligent electric energy meter and has obtained large-scale popularization and application.The intelligence of such vast number Ammeter directly influences the vital interests of user and the safety and stability of society, therefore predict intelligence in time once breaking down Electric meter fault and to repair or replace to it be highly important.

With the extensive use of intelligent electric meter, operation troubles shows sudden, versatility, complexity more and more Feature, the failure prediction method of traditional ammeter are no longer applicable in.Domestic and foreign scholars mainly study at present neural network, grey are pre- Survey and the prediction techniques such as expert system applied in each field, and achieve good effect, but still Shortcomings it Place.The mass data that power information acquisition system provides has given data mining technology one ample scope for abilities just, and in intelligent electricity Table failure predication field, the correlative study in terms of data mining technology are not yet deeply unfolded.

Summary of the invention

The purpose of the present invention is in view of the above-mentioned problems, proposing a kind of intelligent electric meter failure based on the decision tree side of prediction in real time Method, predicted in real time intelligent electric meter failure in the real reliable situation of now forecast accuracy.

In order to achieve the above objectives, the present invention is using technical solution:

Step 1, data prediction is carried out to the intelligent electric meter data of power information acquisition system;

Step 2, according to intelligent electric meter breakdown judge model, by the faulty number of the intelligent electric meter of power information acquisition system According to screening into intelligent electric meter Mishap Database;

The effect of the intelligent electric meter breakdown judge model is to judge whether intelligent electric meter breaks down.

Step 3, the historical data in intelligent electric meter Mishap Database is chosen, training set and test set are classified as, is used Decision Tree algorithms carry out data mining to training set, form intelligent electric meter failure decision tree, then form preliminary classification rule;

Step 4, accuracy assessment is carried out to preliminary classification rule by the data of test set, if accuracy is met the requirements, Then determine that classifying rules is back to training set if accuracy is unsatisfactory for requiring, and re-starts training;

Step 5, intelligent electric meter failure real-time prediction model is generated by the classifying rules finally determined;

Step 6, intelligent electric meter real time fail data basd link intelligent electric meter failure real-time prediction model is connected to carry out in real time Prediction, obtains the real-time prediction result of intelligent electric meter failure.

The step of step 1 carries out data prediction to the intelligent electric meter data of power information acquisition system is, first It first removes the attribute data unrelated with intelligent electric meter failure, have the data of apparent error and the duplicate data of attribute, it then will be each A attribute continuous data discretization.

The step 2 is faulty by the intelligent electric meter of power information acquisition system according to intelligent electric meter breakdown judge model Method of the data screening into intelligent electric meter Mishap Database it is as follows:

(1) when the not equal fault data screening of progress the sum of ammeter total electricity and each rate electricity, judged using following formula The failure that the sum of ammeter total electricity and each rate electricity do not wait:

In formula: W represents electricity ,+represent the direction of electricity as forward direction ,-represent the direction of electricity be it is reversed, i=1 is represented always Period, W+1Represent positive total electricity, W-1Reversed total electricity is represented, i=2 represents peak period, and i=3 represents usually section, i=4 Low-valley interval is represented, i=5 represents the spike period, and e is ammeter rate number, and ρ sentences for the sum of total electricity and each rate electricity be not equal The disconnected factor.As e=4, expression ammeter is four rate ammeters, takes ρ=0.4;As e=3, expression ammeter is three rate ammeters, Take ρ=0.3;As e=2, expression ammeter is two rate ammeters, takes ρ=0.2;

The four rate ammeters, which refer to, supports peak period, usually section, low-valley interval, spike period 4 period chargings Ammeter;Three rate ammeters refer to support only peak period, usually section, 3 period chargings of low-valley interval ammeter;Two rate ammeters refer to Only support the ammeter of 2 usually section, low-valley interval period chargings;

Judgment principle is as follows:

1. when forward and reverse total electricity of ammeter, forward and reverse peak period electricity, forward and reverse usually section electricity, forward and reverse low ebb Section electricity is all larger than 0, and is not sky;

2. the sum of forward and reverse each rate electricity of ammeter is greater than 0;

3. the absolute value of the sum of ammeter total electricity and each rate electricity difference is greater than some threshold values, threshold rule is as follows: such as Fruit is four rate ammeters, and by 0.4 judgement, three rate ammeters are by 0.3 judgement, and two rate ammeters are by 0.2 judgement;

1. 2. 3. 4. being judged as catastrophe failure if meeting judgment principle simultaneously;

(2) when progress electric energy meter flies away with mutation failure data screening, judge the failure journey that electric energy meter flies away and is mutated Sequence is as follows:

A. the same day maximum electricity W is calculated firstf:

In formula: WfFor same day maximum electricity;ImaxFor maximum current;IbFor fundamental current;

B. ammeter is then calculated to fly away and mutation factor K:

In formula: K flies away for ammeter and mutation factor, WtTo work as daily electricity;

Judgment principle is as follows:

1. being directed to resident's table, maximum current I is taken in 1,2,7,8,9, Decembermax, flown away and dashed forward by 12 hours calculating ammeters Variable factor K;3 times of fundamental current I are taken in 3,4,5,6,10, Novemberb, fly away and mutation factor K by 8 hours calculating ammeters;

3. judging that electric energy meter flies away and dashes forward using formula (4) when progress electric energy meter flies away with mutation failure data screening Accident barrier:

K≥1 (4)

3. being judged as catastrophe failure if meeting criterion 2.;

(3) when reversely active indicating value is greater than zero failure data screening to progress ammeter, judging ammeter reversely using following formula has Function indicating value is greater than zero failure:

In formula: P represents active power, and Q represents reactive power, PIt is totalRepresent ammeter reversely active general power, QIt is totalRepresent ammeter Reversed idle general power;

Judgment principle is as follows:

1. there is reversed active general power in electric energy meter or reversed idle general power is greater than 0;

2. being judged as catastrophe failure if meeting criterion 1.;

(4) when carrying out the screening of electric energy meter inverted walk fault data, the premise that electric energy meter inverted walk judges is exclusion copy reading ammeter Positive and negative total electricity is always empty record, and the failure of electric energy meter inverted walk is judged using following formula:

In formula: W+1yFor the positive total electricity of the previous day, W-1yFor the reversed total electricity of the previous day;

Judgment principle is as follows:

Judged according to daily electricity statistical form, for low pressure resident and single-phase industrial and commercial producer, only judges the previous day positive total electricity Whether amount and reversed total electricity are greater than the meter reading indicating value on the same day, if set up, are judged as catastrophe failure;

(5) when carrying out ammeter clock and not screening to fault data, the breakdown judge program of ammeter clock not pair is as follows:

It first determines whether clock synchronization errors number m, if clock synchronization errors number is greater than 3 times, is directly determined as catastrophe failure, That is:

M > 3 are serious (7)

In formula: m is clock synchronization errors number;

If m is not more than 3, when whether meeting the requirement of Δ t by on-line monitoring inquiry, and generating electric energy meter by the standard of Δ t The overproof grade of clock is then judged using formula (8):

In formula: Δ t is the difference of terminal and clock of power meter, and calculation method is shown in formula (9):

Δ t=| tTerminal-tAmmeter| (9)

In formula: tTerminalIndicate terminal clock, tAmmeterIndicate clock of power meter;

Judgment principle is as follows:

1. being directly judged as catastrophe failure if clock synchronization errors number m is more than 3 times;

2. being judged as generic failure as the difference Δ t of terminal and clock of power meter meets 5min≤Δ t < 15min;

If 15min≤Δ t < 30min is judged as important failure;If Δ t > 30min is judged as catastrophe failure;

(6) when carrying out ammeter electric energy rate setting abnormal failure data screening, ammeter electric energy rate is judged using following formula Abnormal failure is set:

W+5≠ 0 or W-5≠0 (10)

Judgment principle is as follows:

1. only judging the electric energy meter of DLT-2007 specification;

2. judging whether there is positive spike period electricity or reversed spike period electricity, and if it exists, be then judged as serious Failure;

(7) when carrying out the screening of electric energy meter forward direction shunt running fault data, the event of electric energy meter forward direction shunt running is judged using following formula Barrier:

Or

Judgment principle is as follows:

If meeting formula (11) 3 times, it is judged as important failure, if meeting formula (11) 5 times, is judged as serious event Barrier;

(8) when the reversed shunt running fault data screening of progress electric energy meter, the event of the reversed shunt running of electric energy meter is judged using following formula Barrier:

Judgment principle is as follows:

The case where electric energy meter forward direction total electricity and reversed total electricity for clearing class exist simultaneously and be greater than 0.1, then sentence Break as catastrophe failure.

The step 3 chooses the historical data in intelligent electric meter Mishap Database, is classified as training set and test set, Data mining is carried out to training set using decision Tree algorithms, forms intelligent electric meter failure decision tree, then forms preliminary classification rule Then, its step are as follows:

If R is the historical data of intelligent electric meter Mishap Database, and gives training set S for 60% data of R, the 40% of R Data give test set T.Data mining is carried out to training set S for using C5.0 algorithm.

Setting tool has the attribute X of n value that S is divided into n subset S1, S2..., SnIf the sum of sample is in S | S |, freq (Ci, S) is to belong to classification C in SiThe number of samples of (i=1,2 ..., N), some sample belongs to classification C in SiProbability beThe information that it is conveyed are as follows:

The entropy info (S) of training set S is indicated by formula (13);

After training set S is divided into n subset according to attribute X, the comentropy of each subset is calculated, then the expectation of set S Information infoX(S) it is indicated with formula (14);

In order to measure the obtained information of S for carrying out subregion according to inspection by attributes X, using gain standard gain (X), it is selected Selecting enables its value to maximize, i.e., the selection of this standard is to have the attribute of highest information gain to carry out every subzone;

Gain (X)=info (S)-infoX(S) (15)

S is divided into S according to n of attribute X different values1, S2..., SnThe potential information generated after total n subset Split_info (X) is shown in formula (16);

Formula (17) is that X carries out division information ratio of profit increase gain_ratio (X) to S;

It calculates for the first time using selecting the attribute of highest information gain-ratio as the root node of decision tree, then decision tree is every One node the method calculates the information gain-ratio of remaining attribute, throws away and selects the attribute of highest information gain-ratio as decision tree Present node, until ultimately forming entire decision tree;

Preliminary classification rule is formed by the decision tree.

The step 4 carries out accuracy assessment to preliminary classification rule by the data of test set, if accuracy meets It is required that, it is determined that classifying rules is back to training set if accuracy is unsatisfactory for requiring, and re-starts training, detailed step It is as follows:

(1) accuracy assesses formula are as follows:

Z is assessment accuracy in formula, and A is that preliminary classification rule predicts correct number in test set T;B is test set T Total data number;

(2) Z ' is set as the accuracy of setting;If Z >=Z ', it is determined that classifying rules;If Z < Z ', returns to training set again Training decision tree.

Intelligent electric meter failure real-time predicting method of the present invention can accurately reflect intelligent electric meter real time fail situation.

Detailed description of the invention

Fig. 1 is the General Implementing flow diagram of the method for the present invention.

Specific embodiment

With reference to the accompanying drawing and specific embodiment the present invention will be further described.

It is right by taking a collection of model DDZY102-Z intelligent electric meter is in the 2 years operation datas in In A Certain Place of Xinjiang area statistics as an example below The present invention is described further.

As shown in Figure 1, the present invention is based on the intelligent electric meter failure real-time predicting method of decision tree the following steps are included:

Step 1, data prediction is carried out to the DDZY102-Z intelligent electric meter data of power information acquisition system, step is such as Under:

(1) it removes the attribute data unrelated with intelligent electric meter failure, have the data of apparent error and the duplicate data of attribute;

(2) by each attribute continuous data discretization.

Step 2, according to DDZY102-Z intelligent electric meter breakdown judge model, by the intelligent electric meter of power information acquisition system Faulty data screening is into intelligent electric meter Mishap Database, and steps are as follows:

The effect of the intelligent electric meter breakdown judge model is to judge whether intelligent electric meter breaks down.

DDZY102-Z intelligent electric meter breakdown judge model is as follows:

(1) when the not equal fault data screening of progress the sum of ammeter total electricity and each rate electricity, because of DDZY102-Z intelligence Energy ammeter is four rate ammeters, and e=4, equal judgement factor ρ does not take 0.4 for the sum of total electricity and each rate electricity.Sentenced using following formula Power off the failure that the sum of table total electricity and each rate electricity do not wait:

Judgment principle is as follows:

1. when forward and reverse total electricity of ammeter, forward and reverse peak period electricity, forward and reverse usually section electricity, forward and reverse low ebb Section electricity is all larger than 0, and is not sky.

2. the sum of forward and reverse each rate electricity of ammeter is greater than 0;

3. the absolute value of the sum of ammeter total electricity and each rate electricity difference is greater than 0.4.

1. 2. 3. 4. being judged as catastrophe failure if meeting judgment principle simultaneously.

(2) when progress electric energy meter flies away with mutation failure data screening, judge the failure journey that electric energy meter flies away and is mutated Sequence is as follows:

A. the same day maximum electricity W is calculated firstf:

In formula: WfFor same day maximum electricity;ImaxFor maximum current;IbFor fundamental current.

B. ammeter is then calculated to fly away and mutation factor K:

In formula: K flies away for ammeter and mutation factor;WtTo work as daily electricity.

Judgment principle is as follows:

1. taking maximum current I in 1,2,7,8,9, December in two annual datas of DDZY102-Z intelligent electric metermax, It flies away and mutation factor K by 12 hours calculating ammeters;3 times of fundamental current I are taken in 3,4,5,6,10, Novemberb, based on 8 hours Ammeter is calculated to fly away and mutation factor K.

2. judging that electric energy meter flies away and dashes forward using formula (4) when progress electric energy meter flies away with mutation failure data screening Accident barrier:

K≥1 (4)

3. being judged as catastrophe failure if meeting criterion 2..

(3) when reversely active indicating value is greater than zero failure data screening to progress ammeter, judging ammeter reversely using following formula has Function indicating value is greater than zero failure:

In formula: P represents active power, and Q represents reactive power, PIt is totalRepresent ammeter reversely active general power, QIt is totalRepresent ammeter Reversed idle general power.

Judgment principle is as follows:

1. there is reversed active general power in electric energy meter or reversed idle general power is greater than 0.

2. being judged as catastrophe failure if meeting criterion 1..

(4) when carrying out the screening of electric energy meter inverted walk fault data, the premise that electric energy meter inverted walk judges is exclusion copy reading electric energy The forward and reverse active total record for sky of indicating value, the failure of electric energy meter inverted walk is judged using following formula:

In formula: W+1yFor the positive total electricity of the previous day, W-1yFor the reversed total electricity of the previous day.

Judgment principle is as follows:

Judged according to daily electricity statistical form, for low pressure resident and single-phase industrial and commercial producer, only judges the previous day positive total electricity Whether amount and reversed total electricity are greater than the meter reading indicating value on the same day, if set up, are judged as catastrophe failure.

(5) when carrying out ammeter clock and not screening to fault data, the breakdown judge program of ammeter clock not pair is as follows:

It first determines whether clock synchronization errors number m, if clock synchronization errors number is greater than 3 times, is directly determined as catastrophe failure, That is:

M > 3 are serious (7)

In formula: m is clock synchronization errors number.

If m is not more than 3, when whether meeting the requirement of Δ t by on-line monitoring inquiry, and generating electric energy meter by the standard of Δ t The overproof grade of clock is then judged using formula (8):

In formula: Δ t is the difference of terminal and clock of power meter, and calculation method is shown in formula (9):

Δ t=| tTerminal-tAmmeter| (9)

In formula: tTerminalIndicate terminal clock, tAmmeterIndicate clock of power meter.

Judgment principle is as follows:

1. being directly judged as catastrophe failure if clock synchronization errors number m is more than 3 times;

2. being judged as generic failure as the difference Δ t of terminal and clock of power meter meets 5min≤Δ t < 15min;

If 15min≤Δ t < 30min is judged as important failure;If Δ t > 30min is judged as catastrophe failure;

(6) when carrying out ammeter electric energy rate setting abnormal failure data screening, ammeter electric energy rate is judged using following formula Abnormal failure is set:

W+5≠ 0 or W-5≠0 (10)

Judgment principle is as follows:

1. only judging the electric energy meter of DLT-2007 specification.

2. judging whether there is positive spike period electricity or reversed spike period electricity, and if it exists, be then judged as serious Failure.

(7) when carrying out the screening of electric energy meter forward direction shunt running fault data, the event of electric energy meter forward direction shunt running is judged using following formula Barrier:

Or

Judgment principle is as follows:

If meeting formula (11) 3 times, it is judged as important failure, if meeting formula (11) 5 times, is judged as serious event Barrier.

(8) when the reversed shunt running fault data screening of progress electric energy meter, the event of the reversed shunt running of electric energy meter is judged using following formula Barrier:

Judgment principle is as follows:

The case where electric energy meter forward direction total electricity and reversed total electricity for clearing class exist simultaneously and be greater than 0.1, then sentence Break as catastrophe failure.

The faulty storage of the institute that DDZY102-Z intelligent electric meter breakdown judge model discrimination is gone out is electric to DDZY102-Z intelligence In table Mishap Database.

Step 3, the historical data in DDZY102-Z intelligent electric meter Mishap Database is chosen, training set and survey are classified as Examination collection carries out data mining to training set using decision Tree algorithms, forms intelligent electric meter failure decision tree, then forms preliminary point Rule-like, detailed step are as follows:

If R is the historical data of intelligent electric meter Mishap Database, and gives training set S for 60% data of R, the 40% of R Data give test set T.Data mining is carried out to training set S for using C5.0 algorithm.

Setting tool has the attribute X of n value that S is divided into n subset S1, S2..., SnIf the sum of sample is in S | S |, freq (Ci, S) is to belong to classification C in SiThe number of samples of (i=1,2 ..., N), some sample belongs to classification C in SiProbability beThe information that it is conveyed are as follows:

The entropy info (S) of training set S is indicated by formula (13);

After training set S is divided into n subset according to attribute X, the comentropy of each subset is calculated, then the expectation of set S Information infoX(S) it is indicated with formula (14);

In order to measure the obtained information of S for carrying out subregion according to inspection by attributes X, using gain standard gain (X), it is selected Selecting enables its value to maximize, i.e., the selection of this standard is to have the attribute of highest information gain to carry out every subzone;

Gain (X)=info (S)-infoX(S) (15)

S is divided into S according to n of attribute X different values1, S2..., SnThe potential information generated after total n subset Split_info (X) is shown in formula (16);

Formula (17) is that X carries out division information ratio of profit increase gain_ratio (X) to S;

It calculates for the first time using selecting the attribute of highest information gain-ratio as the root node of decision tree, then decision tree is every One node the method calculates the information gain-ratio of remaining attribute, throws away and selects the attribute of highest information gain-ratio as decision tree Present node, until ultimately forming entire decision tree.

Preliminary classification rule is formed by the decision tree.

Step 4, accuracy assessment is carried out to preliminary classification rule by the data of test set, if accuracy is met the requirements, Then determine that classifying rules is back to training set if accuracy is unsatisfactory for requiring, and re-starts training, detailed step is as follows:

(3) accuracy assesses formula are as follows:

Z is assessment accuracy in formula, and A is that preliminary classification rule predicts correct number in test set T;B is test set T Total data number.

(4) Z ' is set as the accuracy of setting.If Z >=Z ', it is determined that classifying rules;If Z < Z ', returns to training set again Training decision tree.

Step 5, DDZY102-Z intelligent electric meter failure real-time prediction model is generated by the classifying rules finally determined;

Step 6, DDZY102-Z intelligent electric meter real time fail database is connected to DDZY102-Z intelligent electric meter failure reality When prediction model predicted in real time, obtain the real-time prediction result of DDZY102-Z intelligent electric meter failure.

Claims (2)

1. a kind of intelligent electric meter failure real-time predicting method based on decision tree, which is characterized in that the real-time predicting method Specific step is as follows:
Step 1, data prediction is carried out to the intelligent electric meter data of power information acquisition system;
Step 2, according to intelligent electric meter breakdown judge model, the faulty data of the intelligent electric meter of power information acquisition system are sieved Choosing is into intelligent electric meter Mishap Database;
The intelligent electric meter breakdown judge model is as follows:
(1) when the not equal fault data screening of progress the sum of ammeter total electricity and each rate electricity, ammeter is judged using following formula The failure that the sum of total electricity and each rate electricity do not wait:
In formula: W represents electricity ,+represent the direction of electricity as forward direction ,-represent the direction of electricity be reversely, when i=1 represents total Section, W+1Represent positive total electricity, W-1Reversed total electricity is represented, i=2 represents peak period, and i=3 represents usually section, i=4 generation Table low-valley interval, i=5 represent the spike period, and e is ammeter rate number, and ρ is the judgement that the sum of total electricity and each rate electricity do not wait The factor;As e=4, expression ammeter is four rate ammeters, takes ρ=0.4;As e=3, expression ammeter is three rate ammeters, takes ρ =0.3;As e=2, expression ammeter is two rate ammeters, takes ρ=0.2;
The four rate ammeters refer to support peak period, usually section, low-valley interval, the 4 period chargings of spike period ammeter; Three rate ammeters refer to support only peak period, usually section, 3 period chargings of low-valley interval ammeter;Two rate ammeters, which refer to, only to be propped up Maintain an equal level the period, 2 period chargings of low-valley interval ammeter;
Judgment principle is as follows:
1. forward and reverse total electricity of ammeter, forward and reverse peak period electricity, forward and reverse usually section electricity, forward and reverse low-valley interval are electric Amount is all larger than 0, and is not sky;
2. the sum of forward and reverse each rate electricity of ammeter is greater than 0;
3. the absolute value of the sum of ammeter total electricity and each rate electricity difference is greater than some threshold values, threshold rule is as follows: if it is Four rate ammeters, by 0.4 judgement, three rate ammeters are by 0.3 judgement, and two rate ammeters are by 0.2 judgement;
1. 2. 3. 4. being judged as catastrophe failure if meeting judgment principle simultaneously;
(2) when carrying out electric energy meter and flying away with mutation failure data screening, judge malfunction routine that electric energy meter flies away and is mutated such as Under:
A. the same day maximum electricity W is calculated firstf:
In formula: WfFor same day maximum electricity;ImaxFor maximum current;IbFor fundamental current;
B. ammeter is then calculated to fly away and mutation factor K:
In formula: K flies away for ammeter and mutation factor, WtTo work as daily electricity;
Judgment principle is as follows:
1. being directed to resident's table, maximum current I is taken in 1,2,7,8,9, Decembermax, by 12 hours calculating ammeters fly away and be mutated because Sub- K;3 times of fundamental current I are taken in 3,4,5,6,10, Novemberb, fly away and mutation factor K by 8 hours calculating ammeters;
2. judging that electric energy meter flies away and be mutated event using formula (4) when progress electric energy meter flies away with mutation failure data screening Barrier:
K≥1 (4)
3. being judged as catastrophe failure if meeting criterion 2.;
(3) when reversely active indicating value is greater than zero failure data screening to progress ammeter, judge that ammeter is reversely active using following formula and show Value is greater than zero failure:
In formula: P represents active power, and Q represents reactive power, PIt is totalRepresent ammeter reversely active general power, QIt is totalIt is reversed to represent ammeter Idle general power;
Judgment principle is as follows:
1. there is reversed active general power in electric energy meter or reversed idle general power is greater than 0;
2. being judged as catastrophe failure if meeting criterion 1.;
(4) when carrying out the screening of electric energy meter inverted walk fault data, the premise that electric energy meter inverted walk judges is positive and negative to exclude copy reading ammeter Total electricity is always empty record, and the failure of electric energy meter inverted walk is judged using following formula:
In formula: W+1yFor the positive total electricity of the previous day, W-1yFor the reversed total electricity of the previous day;
Judgment principle is as follows:
Judged according to daily electricity statistical form, for low pressure resident and single-phase industrial and commercial producer, only judges the previous day positive total electricity W+1y With reversed total electricity W-1yWhether the meter reading indicating value on the same day is greater than,That is the same day positive total electricityW+1 With reversed total electricityW-1 If It sets up, is then judged as catastrophe failure;
(5) when carrying out ammeter clock and not screening to fault data, the breakdown judge program of ammeter clock not pair is as follows:
It first determines whether clock synchronization errors number m, if clock synchronization errors number is greater than 3 times, is directly determined as catastrophe failure, it may be assumed that
M > 3 is serious (7)
In formula: m is clock synchronization errors number;
If m is not more than 3, the requirement of Δ t whether is met by on-line monitoring inquiry, and super by the standard of Δ t generation clock of power meter Poor grade is then judged using formula (8):
In formula: Δ t is the difference of terminal and clock of power meter, and calculation method is shown in formula (9):
Δ t=| tTerminal-tAmmeter| (9)
In formula: tTerminalIndicate terminal clock, tAmmeterIndicate clock of power meter;
Judgment principle is as follows:
1. being directly judged as catastrophe failure if clock synchronization errors number m is more than 3 times;
2. being judged as generic failure as the difference Δ t of terminal and clock of power meter meets 5min≤Δ t < 15min;
If 15min≤Δ t < 30min is judged as important failure;If Δ t > 30min is judged as catastrophe failure;
(6) when carrying out ammeter electric energy rate setting abnormal failure data screening, judge that ammeter electric energy rate is arranged using following formula Abnormal failure:
W+5≠ 0 or W-5≠0 (10)
In formula, W+5For the positive electricity of spike period, W-5For the reversed electricity of spike period;
Judgment principle is as follows:
1. only judging the electric energy meter of DLT-2007 specification;
2. judging whether there is the positive electricity W of spike period+5Or the reversed electricity W of spike period-5, and if it exists, then it is judged as Catastrophe failure;
(7) when carrying out the screening of electric energy meter forward direction shunt running fault data, the failure of electric energy meter forward direction shunt running is judged using following formula:
In formula, W+3For the positive electricity of usually period, W+4For the positive electricity of low-valley interval, W+1For positive total electricity;
Judgment principle is as follows:
If meeting formula (11) 3 times, it is judged as important failure, if meeting formula (11) 5 times, is judged as catastrophe failure;
(8) when the reversed shunt running fault data screening of progress electric energy meter, the failure of the reversed shunt running of electric energy meter is judged using following formula:
In formula, W+1Represent positive total electricity, W-1Represent reversed total electricity;
Judgment principle is as follows:
The case where electric energy meter forward direction total electricity and reversed total electricity for clearing class exist simultaneously and be greater than 0.1, then be judged as Catastrophe failure;
Step 3, the historical data in intelligent electric meter Mishap Database is chosen, training set and test set are classified as, using decision Tree algorithm carries out data mining to training set and forms intelligent electric meter failure decision tree, then forms preliminary classification rule;
Step 4, accuracy assessment is carried out to preliminary classification rule by the data of test set, if accuracy is met the requirements, really Determine classifying rules, if accuracy is unsatisfactory for requiring, is back to training set, re-starts training;
Step 5, intelligent electric meter failure real-time prediction model is generated by the classifying rules finally determined;
Step 6, intelligent electric meter real time fail data basd link intelligent electric meter failure real-time prediction model is connected to be predicted in real time, Obtain the real-time prediction result of intelligent electric meter failure.
2. the intelligent electric meter failure real-time predicting method according to claim 1 based on decision tree, which is characterized in that described Step 1 the step of data prediction is carried out to the intelligent electric meter data of power information acquisition system are as follows: removal and intelligence first The unrelated attribute data of electric meter fault has the data of apparent error and the duplicate data of attribute, then by each attribute consecutive numbers According to discretization.
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