CN107870312A - A kind of intelligent electric energy meter kinematic error remote calibration method - Google Patents
A kind of intelligent electric energy meter kinematic error remote calibration method Download PDFInfo
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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- G01R35/04—Testing or calibrating of apparatus covered by the other groups of this subclass of instruments for measuring time integral of power or current
Abstract
It is the present invention relates to a kind of intelligent electric energy meter kinematic error remote calibration method, the step of this method：This method concretely comprises the following steps：(1) intelligent electric energy meter cluster is installed to form tree topology；(2) the flow conservation basic model of the intelligent electric energy meter cluster is obtained；(3) virtual tributary dynamic corrections intelligent electric energy meter cluster topology model is introduced, obtains flow conservation algorithm model；(4) the current increment data of multiple intelligent electric energy meter cluster are obtained, calculate relative error；(5) result of calculation is modified and Evaluation of Uncertainty；(6) error calculation result is drawn.The intelligent electric energy meter that the present invention has on-line operation for Guo Wang companies 4.8 hundred million uses the full data sample mode of thinking, excavate power user power consumption information acquisition system magnanimity energy data, without external perimysium reference instrument, carry out intelligent electric energy meter remote verification technical research, so that the accuracy of electric power meter can be understood in real time for electricity consumption both sides, meet the client's property it is expected demand, improve corporate image.
Description
Technical field
The invention belongs to electric energy metrical field, especially a kind of intelligent electric energy meter kinematic error remote calibration method.
Background technology
The hot issue that operating electric power meter accuracy is resident all the time and Guo Wang companies most pay close attention to.Mesh
Before, Guo Wang companies are using the means such as statistical analysis technique or addition online detection instrument, to realize that intelligent electric energy meter operation misses
The supervision and evaluation of difference.Although statistical analysis method change over resident's single-phase electric energy meter by rotate at regular intervals for sampling observation, but still
It is the control to overall batch；Will be that enterprise brings buying, the increase of maintenance cost, the party by adding on-line monitoring equipment
Method maintenance cost is high and has limitation.
The technical program is aimed to the intelligent electric energy meter that Guo Wang companies 4.8 hundred million have on-line operation with totally according to sample
This mode of thinking, power user power consumption information acquisition system magnanimity energy data is excavated, without external perimysium reference instrument, carried out
Intelligent electric energy meter remote verification technical research so that the accuracy of electric power meter can be understood in real time for electricity consumption both sides, it is full
The sufficient client property it is expected demand, improves corporate image.
By retrieving, the disclosed patent document of analogous technical is not found.
The content of the invention
It is an object of the invention in place of overcome the deficiencies in the prior art, there is provided a kind of intelligent electric energy meter kinematic error is long-range
Calibration method.
The present invention solves its technical problem and takes following technical scheme to realize：
A kind of intelligent electric energy meter kinematic error remote calibration method, it is characterised in that：This method concretely comprises the following steps：
(1) intelligent electric energy meter cluster is installed to form tree topology, can remotely obtain in the intelligent electric energy meter cluster
Summary table and each point of flow-meter data；
(2) the tree topology formed according to intelligent electric energy meter cluster, the flow conservation of the intelligent electric energy meter cluster is obtained
Basic model；
(3) line loss error is corrected, virtual tributary dynamic corrections intelligent electric energy meter cluster topology model is introduced, repaiies simultaneously
Positive flow conservation basic model, obtain flow conservation algorithm model；
(4) the current increment data of multiple intelligent electric energy meter cluster are obtained, by the electric current of the intelligent electric energy meter cluster got
Flow increasing data substitute into flow conservation algorithm model, calculate relative error；
(5) result of calculation is modified and Evaluation of Uncertainty；
(6) error calculation result is drawn.
Moreover, the virtual tributary replaces the failure values sum of circuit consume, the virtual tributary includes Virtual Intelligent electric energy
Table and dummy load.
Moreover, the flow conservation basic model is：Y ε=- η.
Moreover, the outflow of the virtual tributary is cluster summary table M0Reading increment subtract each point of table Mj(j=1, n)
Sum, and by this value be multiplied by one by empirical value judge loss factor；After adding virtual tributary, revised flow conservation
Algorithm model isα is amendment experience.
Moreover, the method for solving of the revised flow conservation algorithm model is：
The current increment data of the intelligent electric energy meter cluster of m=n-1 times are obtained, substitute into flow conservation algorithm model, wherein,yiFor ith measurement result vector；ε=(ε1 ε2 εn-1)T；η=
(y1,0ε0-α(y1,0x1,n) y2,0ε0-α(y2,0x2,n) yn-1,0ε0-α(y1,0xn-1,n))T；
To solve equation group, matrix Y is done into LU and decomposes Y=LU, z=U ε is made, equation group Lz=- η is obtained, under being due to L
Triangle battle array, easily solves z；Again because U is upper triangular matrix, ε is easily solved, and then obtain relative error δj。
Moreover, (4) the step obtains the current increment data of multiple intelligent electric energy meter cluster, it is before the computation, it is necessary to right
Continuous data storehouse carries out data prediction, filters out the stronger data of independence；The step of method of the data prediction according to
It is secondary to be：Real-time test, data integrity inspection, data integration, lacuna processing, data analysis note abnormalities data and orthogonal
Property examine.
Moreover, the computational methods of the Evaluation of Uncertainty：In the case of given initial experience value α=0, electricity is calculated
Energy table cluster error condition, if the result of calculation meets confidence level requirement, that is, the overproof electric energy meter quantity calculated is less than regulation
In the range of, then the algorithm terminates；Otherwise α value section is adjusted upward, returns to Algorithm for Solving.
The advantages and positive effects of the present invention are：
1st, this method utilizes flow conservation principle and big data analytical technology, is not adding standard device, is not changing meter
Structure, in the case of not changing electric energy meter cluster topology, realize the remote detection of magnanimity on-line operation electric energy meter error.
2nd, this method establishes the amendment topological model based on virtual tributary, realizes that the measurement of on-line operation electric energy meter error is reliable
Property 100%, instructs electric energy meter more to change jobs to more lean.
3rd, the big data Predicting Technique of this method combination electric energy meter error variation tendency, before the appearance of overproof problem
Complete user's unaware to change the outfit operation, remove a hidden danger, avoid the occurrence of unnecessary metering accuracy dispute.
4th, the present invention can effectively reduce marketing operation cost, and the money such as personnel in checking procedure, vehicle, equipment can be greatly decreased
The consumption in source, save marketing maintenance O＆M cost；Also, by realizing that remote verification can be realized to the accurate of failure electric energy meter
Change, tear back reduction fault-free electric energy meter open quantity 95%, the generation of less electronic waste is green；If this technology
Extend in the range of nationwide integrated power grid and apply, this technology is estimated after realizing can to reduce by 12000 tons of electronic wastes every year, save electric energy meter
About 136.31 hundred million yuan of procurement payment, is greatly reduced enterprise's O＆M cost, realizes upgrading synergy, has significant economic benefit and society
Can benefit.
5th, this technology can not only realize comprehensive remote detection of residential households electric energy meter kinematic error and diagnosis, can be with
Whole broad sense flow measurements are generalized to, such as natural gas and water, heat field, are had a extensive future.
6th, the present invention has the intelligent electric energy meter of on-line operation for Guo Wang companies 4.8 hundred million, with full data sample thinking side
Formula, power user power consumption information acquisition system magnanimity computer data is excavated, without external perimysium reference instrument, carries out intelligent electric energy
Table remote verification technical research so that the accuracy of electric energy meter metering device can be understood in real time for electricity consumption both sides, meet client
The property it is expected demand, lifting incorporated business image.
Brief description of the drawings
Fig. 1 is error remote verification flow of the present invention；
Fig. 2 is intelligent electric energy meter cluster schematic diagram under tree topology；
Fig. 3 is the electric energy meter cluster schematic diagram for introducing virtual tributary；
Fig. 4 is Measurement reliability R (t) change schematic diagrams；
Fig. 5 is that electric energy meter and power network in-site modeling run work block diagram；
Fig. 6 is load simulation cell operation theory diagram；
Fig. 7 is PWM rectification boosting circuits；
Fig. 8 is conductive discharge circuit.
Embodiment
Below in conjunction with the accompanying drawings and the invention will be further described by specific embodiment, and following examples are descriptive
, it is not limited, it is impossible to which protection scope of the present invention is limited with this.
A kind of intelligent electric energy meter kinematic error remote calibration method, it is characterised in that：This method concretely comprises the following steps：
(1) intelligent electric energy meter cluster is installed to form tree topology, can remotely obtain in the intelligent electric energy meter cluster
Summary table and each point of flow-meter data；
(2) the tree topology formed according to intelligent electric energy meter cluster, the flow conservation of the intelligent electric energy meter cluster is obtained
Basic model；
(3) line loss error is corrected, virtual tributary dynamic corrections intelligent electric energy meter cluster topology model is introduced, repaiies simultaneously
Positive flow conservation basic model, obtain flow conservation algorithm model；
(4) the current increment data of multiple intelligent electric energy meter cluster are obtained, by the electric current of the intelligent electric energy meter cluster got
Flow increasing data substitute into flow conservation algorithm model, calculate relative error；
(5) result of calculation is modified and Evaluation of Uncertainty；
(6) error calculation result is drawn.
This method calculates electric energy meter error by day electricity is freezed, by algorithm, realizes to the real-time remote of electric energy meter error
Range monitoring.Remote calibration is carried out to electric energy meter using electric energy meter acquisition system meter reading data.
Electric energy is considered as a kind of broad sense flow for meeting law of conservation by this method, and the common trait that such instrument has is peace
The cluster formed after dress has tree topology.Therefore about fixed in flow conservation, the actual flow increment of summary table in the same period
Equal to the actual flow increment sum of each point of table.Because actual flow increment can be represented with reading increment and relative error, therefore
An equation comprising all meter reading increments and relative error can be obtained.If it is known that any one instrument in cluster
Relative error and using the relative error of other instrument as unknown quantity, and notice and can make equation by increasing measurement period
Meet or exceed the quantity of unknown number, then the relative error of other instrument can be determined by solving equation group.This is autonomous
Formula algorithm is by the mutual contrast conting error of cluster internal instrument, without external perimysium reference instrument.
When tree topology flow tube, which exists, to be leaked, it is necessary to which equation group is modified.In electric energy metrical, leakage is shown as
Line electrical leakage, resistance loss and ammeter power consumption.In the method, loss is considered as the load of virtual tributary, and introduces virtual
Electric energy meter.Using the electric parameter measurement function of intelligent electric energy meter, loss correction item is determined.Provide revised algorithm flow and
Simulation result.
This method can not only be applied to intelligent electric meter, can apply intellectual water meter, intelligent gas meter and Intelligent heat quantity
Among the remote calibration of the intelligent electric energy meters such as table.
It is specific decomposable process below：
For the ease of clearly describing this method, provide be defined as below first：
Stream：Flow in or out a certain occluding surface S scalar (shown in Fig. 2 arrows).It is negative to flow into just, to flow out.Convection current
Do following agreement：Stream will not be accumulated and any moment is in compliance with law of conservation.I.e. through any enclosed curved surface S current algebra and wait
In zero.Stream is with the integer mark since 0.
Broad sense flow：Abbreviation flow, flow the integration to the time.Flow conservation can be released by stream conservation.That is random time
In section, the flow increment algebraical sum through occluding surface S is equal to zero.
Intelligent electric energy meter：Abbreviation flow instrument or flowmeter (M in Fig. 20~M4), record the corresponding instantaneous delivery flowed.Flow
Meter is with MjMark, j are the numbering of corresponding stream.
Cluster：Through the set of the flow instrument corresponding to a certain occluding surface S all streams.
Meter reading：Obtain the reading of all instrument in a certain moment cluster.In logic, it is identical should to return to each instrument for meter reading action
The reading at moment.If but in fact, each meter reading return time interval it is short enough, be regarded as mutually in the same time.
Measurement：One-shot measurement is the meter reading twice to cluster certain interval of time, the result is that the increasing of front and rear reading twice
Amount.
First, flow conservation ideally：
Relative error δ：
Wherein x is the actual increment by the flow of certain instrument in a period of time, and y is the instrument in the same period
The increment of reading.
Certain occluding surface S defines flow instrument cluster AS={ Mj| stream j passes through occluding surface S }, flow instrument in cluster
Number NS=n.If flowmeter MjIth measurement result is yij, corresponding actual value is xij.Wherein i=1,2, m, m
For pendulous frequency.Had according to flow conservation agreement
If δjRepresent flowmeter MjRelative error, then by definition save relative error definition can obtain
(2) formula is substituted into, is hadSet up.Without loss of generality, it is assumed that δ0, it is known that then have
Order
(3) formula of substitution has
(5) formula can be write as matrix form
Y ε=- η (6)
Wherein
yiFor instrument M1~Mn-1The result vector of ith measurement.
ε=(ε1 ε2 εn-1)T, η=(y1,0ε0 y2,0ε0 ym,0ε0)T。
(6) formula shows, if in known cluster a certain instrument relative error δ0, then multigroup survey of all instrument can be passed through
Amount result extrapolates the relative error δ of other each instrumentj, j=1,2, n-1.
We focus primarily upon related variable and the calculating of error of electric energy meter for the understanding of electric energy meter error at present
Method.And in practice, actual power Watch Error might have some variations.Here, we discuss the deviation and result
Relation between calculated value：
Without loss of generality, perturbation matrix matrix Δ Y is added, coefficient matrix is changed into Y+ Δs Y, corresponding error vector and total
Meter reading addition perturbation vector is changed into ε+Δ ε, η+Δ η
Equation
Group is changed into (Y+ Δ Y) (ε+Δ ε)=η+Δ η.We have following theorem：
(1) equation group (Y+ Δ Y) (ε+Δ ε)=η+Δ η solution is ε+Δ ε
(2)Prove as follows：
(Y+ Δ Y) (ε+Δ ε)=η+Δ η
Y ε+Δ Y ε+Δ Y/delta ε+Y/delta ε=η+Δ η
Δ Y ε+Δ Y/delta ε+Y/delta ε=Δ η
Δ ε=Y-1Δη-Y-1ΔYε-Y-1ΔYΔε
| | Δ ε | |=| | Y-1Δη-Y-1ΔYε-Y-1ΔYΔε||
||Δε||≤||Y-1||||Δη||+||Y-1||||ΔY||||ε||+||Y-1||||ΔY||||Δε||
Therefore in actual applications, the constant interval of solution of equation exists when conditional matrix Y changesIt is interior.
Definition:For nonsingular matrix A, claim product | | A | | | | A-1| | it is the conditional number of matrix A, is designated as cond (A),
Cond (A)=| | A | | | | A-1||.
For system of linear equations Y ε=- η, if cond (Y) is relatively very big, it is an ill-conditioned linear systems to claim Y ε=- η, most
The good solution for not using equation group.If cond (Y) is relatively small, can use.
Amendment topological model based on virtual tributary
The general principle of algorithm is discussed without considering various losses.Leakage or damage in actual broad sense flow tube often be present
Consumption, such as leakage loss, resistance loss and electric energy meter power consumption in power circuit.Requiring the occasion needs of exact computation results
Further consider these factors.
Loss (electric energy meter loss, leakage loss, line resistance loss etc.), traditional side be present in actual electric energy meter cluster
Method assumes that electric energy meter loss is proportional with electric energy meter cluster influx, is yet with electric energy meter line lossrjFor the line resistance of j-th strip branch road；Leakage loss eL=U2σTi, U is that line voltage distribution (generally takes
220V), σ is that cluster always leaks electricity conductance；Electric energy meter is lost For MjAverage active power, and these damage
Consumption value is difficult to simply judge whether and flows into whether electricity is presented linearly or nonlinearly relation, and virtual tributary is introduced for this, instead of
The loss value sum being the theme in problem with line loss.The branch road includes virtual electric energy meter and dummy load.Cluster total losses
The energy consumption of dummy load can be equivalent to.In figure 3, imaginary occluding surface S defines an electric energy meter cluster, and electric energy meter is to accord with
Number Mj(j=0,1, n) represent.MnFor virtual electric energy meter.Agreement flows into S energy as just, it is negative to flow out.
Due to the presence of virtual tributary, if the loss of virtual tributary can be exactly equal to cluster loss, then equation or so two
Side is naturally equal, and each electric energy meter error calculated value is equal to its true value.But due in actual conditions, loss be it is unknown, I
Be not directly available the solution.
2nd, virtual tributary computed losses are added：
There is loss (electric energy meter loss, leakage loss, line resistance loss etc.) in actual electric energy meter cluster, we introduce
The concept of virtual tributary, instead of the loss value sum being the theme in problem with line loss.The branch road include virtual electric energy meter and
Dummy load.Cluster total losses can be equivalent to the energy consumption of dummy load.In figure 3, imaginary occluding surface S defines an electricity
Energy table cluster, electric energy meter is with symbol Mj(j=0,1, n) represent.MnFor virtual electric energy meter.The energy that agreement flows into S is just stream
It is negative for going out.
It is located at ith measurement period TiInside flow through MjElectric energy be xi,j(i=1,2, m, to identify each measurement period
Sequence number；M is pendulous frequency), then following formula establishment is had according to law of conservation of energy.
It has been generally acknowledged that in the ith measurement period, MjReading increment yi,jWith xi,jWith following relation.
yi,j=(1+ δj)xi,j (10)
(10) in formula, δjFor Mj(average) relative error.If order
Then (11) formula can turn to
Without loss of generality, it is assumed that known M0Relative error δ0, so as to understand ε0.Provide virtual electric energy meter MnIt is relative by mistake
Poor δn=0, so as to there is εn=1 and xi,n=yi,nSet up.Therefore (2-22) formula turns to
3rd, the expression being lost in virtual tributary
(13) Section 3 x in the left side in formulai,nRepresent measurement period TiThe energy consumption (the total loss of cluster) of interior dummy load,
On the premise of the conservation of energy, if in known cluster a certain instrument relative error δ0, it is likely that pass through multigroup measurement result yi,j
Extrapolate the ε of other all electric energy metersj, and then obtain relative error δj(j=1,2, n-1).In actually calculating, virtual branch
The outflow on road is cluster summary table M0Reading increment subtract each point of table MjThe sum of (j=1, n), and this value is multiplied by one
The loss factor judged by empirical value.Energy loss of the loss factor as electric energy meter cluster, by circulation described below
Alternative manner is tried to achieve.On the other hand, after adding virtual tributary, equation respective change is
α is amendment experience, is a range of random value.
Data screening：
This method is omitted firstly the need of electric energy meter correlation meter reading data is obtained from power information acquisition system by filling up
Data, eliminate abnormal data, smooth noise data, and correct inconsistent data, remove noise in data, filling null value,
Missing value and processing inconsistent data, so as to obtain valid data.
We need to obtain the measurement result of all meters in whole tree-structured system first, and measurement together has not
In the case of deterministic, we can more acquisition data as far as possible, to ensure the accuracy of the result under rational calculation error
With completeness requirement.Data volume minimum should add one not less than ammeter quantity.Data screening has the following steps：1. real-time inspection.
2. integrity checking and missing values processing.3. method for visualizing notes abnormalities, the orthogonality of data 4. is examined
Real-time inspection：Whether we check same group of meter meter reading value in same time point copy reading.If it is unsatisfactory for this
It is required that data can not use.
Data integration：Data integration is on the basis of original meter reading data, and electric energy meter reading data are added into the table
Count in history meter reading data.
Integrity checking and missing values processing：We need to carry out integrity checking to data first.Integrity checking
Groundwork is missing values processing.For missing values processing, traditional method has direct deletion, or utilizes average value, intermediate value, divides
Digit, mode, random value etc. substitute.It is general so to do effect, because being modified equal to people to data.The side that we use
Method gives a forecast model to calculate missing values by history error and other margins of error, is added to after calculating missing values in algorithm and carries out
Whether secondary checking, judging the situation of missing values can meet that missing requires.Specifically, if in one group of data missing values compared with
More, missing amount is excessive, and we directly can fall the rejection of data, because if larger noise can be produced by introducing, result is caused
Harmful effect.Empirically value judges, if missing values are more than 10%, we are more likely to wait more meter reading datas.If energy
Meet to require, missing gathered data electric energy meter reading is added in the power consumption of virtual tributary by we first, uses master mould
Calculate electric energy meter error situation.If data are maintained within zone of reasonableness added to result of calculation after virtual tributary renewal, we
Further according to the average line loss experience accounting of the taiwan area, deduction line loss is filled to data from the electricity of virtual tributary.After filling,
Error condition is recalculated using the form of filling, if meeting other meters change twice less and lacking meter to calculate with history
It is worth the little condition of deviation, it is correct that we are considered as the filling of its result.Without loss of generality, we are using missing values electric energy meter as table 1,
In the case where pendulous frequency m is not less than n-1, (14) formula is write as matrix form
Y ε=- η ' (15)
WhereinyiFor ith measurement result vector；ε=(ε2 ε3
εn-1)T；η '=η-y·1=(y1,0ε0-α(y1,0x1,n)-y11 y2,0ε0-α(y2,0x2,n)-y12 yn-1,0ε0-α(y1,0xn-1,n)-y1n
)T.By mentioned earlier, similarly equation (15) can solve.If ε=(ε2 ε3 εn-1)TMeeting the requirement, then equation is reasonable, according to
Virtual tributary value recovers the result.
Data analysis notes abnormalities data (by visualization tool)：Using the daily meter reading data of electric energy meter as one to
Amount, then multigroup copy reading can form a Vector Groups.In multidimensional data analysis technology, by by each vector visualization table
Show, therefrom find out the special vector changed extremely.Using Crystal Analysis visualization tool method, it can be found that special
The different point value that peels off, special analysis are done to this point value, further enhance data monitoring, optimize core data.In addition, calculated using cluster
Method analyzes the vector clusters, as a kind of special discovery method to be noted abnormalities in visable representation in data basis.
Orthogonality is examined：Error analysis algorithm requires there is weak dependence between each equation of equation group, and otherwise equation group is in disease
State causes error calculated to exceed tolerance interval.When meeting enough requirements, equation can just calculate.
Computational methods：Electric energy meter error iterative calculation method based on uncertainty of measurement
What it is due to this method measurement is electric energy meter mean error interior for a period of time, and the result of measurement is estimating of being measured
Evaluation, the uncertain factor in measurement process can cause the uncertainty of measurement.After being modified for known systemic effect
Measurement result still simply measured estimate, consider Evaluation of Uncertainty method, guarantee makes not exclusively preferably multiple
In the case that existing or representativeness of sample not enough waits, measuring still can reflect truth.
Iterative method is a kind of process being constantly newly worth with the old value recursion of variable, and iterative algorithm is a kind of base solved the problems, such as
This method.Its basic thought is to release the new value of its one from the initial value of variable.In our method, iteration is applied to pair
Virtual circuit amendment experience α estimation.
Provide hypothesis first herein：The quantity of the overproof table of error is less than the 5% of summary table quantity in a taiwan area, is me
Think the reliability of measurement instrument 95%.
In general, the reliability of measurement instrument can be increased over time and reduced, therefore for the ratio in difference
Taiwan area we perform the calibrating reliability objectives scope of floating.Fig. 4 is Measurement reliability and the change schematic diagram of time.According to platform
The average usage time length situation of meter in area, we are modified to the value.
Our method is summarized as follows：In the case of given initial experience value α=0, electric energy meter cluster error is calculated
Situation, if the result of calculation meets confidence level requirement, that is, the overproof electric energy meter quantity calculated is less than in prescribed limit, then the calculation
Method terminates.Otherwise α value section is adjusted upward, returns to Algorithm for Solving.
Joint Evaluation of Uncertainty method：
Mathematical modeling:δ=1/ (Y-1η)-1
Due to Y, η meets independence, then has：
So we have joint expanded uncertainty U=kucK=2 is taken, is had：
If the electric energy meter error solved meets actual desired, independent repeated measures then are carried out to being measured, pass through gained
A series of measured values arrived, experimental standard deviation s (x) is obtained with statistical analysis technique, when by the use of arithmetic mean of instantaneous value as measured
During estimate, the uncertainty of estimate is measured by calculating：
Using Bessel Formula method, it is measured independent repeated measures n time to same under the conditions of repeatability, obtains n and survey
Obtain value xi=(i=1,2 ..., n), the best estimate for being measured X is the arithmetic average of n independent measured valuesBy as follows
Formula calculates：
Single measured value xkExperimental variance s2(x)：
Single measured value xkExperimental standard deviation s (x)：
It is measured estimateUncertainty
The cell stage body model structure that the present embodiment is built
To promote the reproduction of site problems and more preferable analysis solves site problems, this project simulation built electric energy meter and
The technical scheme of power network scene running status, its operation principle block diagram are as shown in Figure 5.The theory diagram is mainly by PC units, more
Road Communications service unit, high-power program control alternating-current voltage source, gate energy meter, line loss analogue unit, subject electric energy meter and phase
The part such as load simulation unit answered forms.
Its operation principle：Overall control is carried out to its each equipment by multiplex communication service unit by PC, to high-power journey
Amplitude, frequency and the harmonic content of control alternating-current voltage source can carry out any setting, be changed pair with the simulating grid quality of power supply
The influence brought is measured, while mould is carried out with line loss analogue unit to gate energy meter to the line loss between ordinary electric meter
Intend.It is usually active loss to consider line loss unit, therefore this line loss analogue unit is using resistive load in kind of impedance adjustable etc.
Effect, in the range of the Ω continuously adjustabes of 0 Ω~10.For load simulation unit, consider existing domestic loads characteristic more it is next it is changeable,
Become increasingly complex, realized in this programme using electronic load mode., can be to the work(of electronic load by the parameter setting of PC softwares
Rate factor and watt level carry out any setting, more preferably to simulate the actual metered operating load at electric energy scene.Emphasis pair below
The operation principle of load simulation unit does an introduction.
Load simulation unit comprehensive is set using Power Electronic Technique, embedded software technology and power system automation technology
Meter realize, can analog regulation load power factor (PF) and watt level.The operation principle block diagram of fictitious load as shown in fig. 6, its
Basic functional principle：First, the input voltage of sampling test power supply, is analyzed input voltage signal, is done with the voltage signal
For current reference signal Iref reference signal.According to set mode of operation (constant pressure, constant current, invariable power and constant-resistance) and work(
Rate factor generates corresponding current reference signal Iref by single-chip microcomputer.Reference signal carries out differential amplification with actually entering electric current Is
Ierr signals are obtained, the triangular wave of Ierr signals and 23kHz is compared, produce SPWM pulse signals, the signal is through overdriving
Isolation circuit is used for the turn-on and turn-off for controlling H bridges IGBT, and Boost boosts to DC voltage Udc.Rear class discharge circuit is according to adopting
The DC voltage Udc of sample, the PWM ripples of corresponding dutycycle are generated by single-chip microcomputer, and leading for IGBT is controlled through overdriving isolation circuit
It is the logical and turn-off time, equivalent into needs so as to control nickel filament resistance (being divided to two kinds of small resistor and big resistance) to switch on and off
Resistance.PWM dutycycle is adjusted according to Udc variable quantity, to keep Udc in the value of design.
Fictitious load designed by the program meets that test power supply is tested under different conditions.The fictitious load of design
For resistance consumption type, i.e. in test process, caused energy is fallen fictitious load by resistance consumption.According to its operation principle, mould
Intend load circuit implementation and be broadly divided into two-stage.Prime PWM rectification boosting circuits (such as Fig. 7), using wholly-controled device, work
In high frequency state.By using turning on and off for suitable SPWM impulse waves control device for power switching so that input AC
Boost in voltage is to design load Udc.
Rear class is conductive discharge circuit, sees Fig. 8.According to the DC voltage Udc of sampling, suitable PWM is generated by single-chip microcomputer
Ripple, IGBT turn-on and turn-off are driven, so as to reach the purpose of different resistances.This partial circuit is completed test power supply and tested
Energy expenditure in journey.
The experimental verification of algorithm：
We have chosen a certain 19 pieces of electric energy meter clusters of taiwan area in Efficiency in Buildings in Tianjin Area, obtain 150 workaday days of the cluster
Freezing data.For the data, we are to this above-mentioned algorithm of execution.It was found that after 8 iteration, virtual tributary is taken
For empirical value at section [0.8,0.9], the calculating for electric energy meter error is by larger improvement and good result：
(α=0) error calculation amount under the original state of form 1
| Label | Error calculation value | Label | Error calculation value |
| 1 | 1.5590% | 10 | - 14.5640% |
| 2 | - 2.7938% | 11 | - 9.0017% |
| 3 | - 5.1089% | 12 | 5.5293% |
| 4 | - 0.2388% | 13 | 0.0485% |
| 5 | - 3.1209% | 14 | - 0.4204% |
| 6 | 3767.6317% | 15 | - 3.8429% |
| 7 | - 0.3551% | 16 | - 5.7363% |
| 8 | - 4.0477% | 17 | - 3.1323% |
| 9 | - 2.9027% | 18 | - 2.2543% |
Final (α ∈ [the 0.8,0.9]) result of calculation of the iteration of form 2
We have found that electric energy meter error is in reasonable level in this section, according to evaluation of uncertainty in measurement method,
10 electric energy meter error data are calculated in slippage method, provide the result of calculation under the evaluation of standard inaccuracy and half-breadth section:
The result of calculation of form 3 and its half-breadth section
| Label | Error calculation value | Half-breadth section | Label | Error calculation value | Half-breadth section |
| 1 | 0.09% | 0.02% | 10 | 0.13% | 0.09% |
| 2 | 0.35% | 0.02% | 11 | 0.04% | 0.02% |
| 3 | - 0.21% | 0.02% | 12 | - 0.11% | 0.09% |
| 4 | 0.54% | 0.02% | 13 | 0.00% | 0.00% |
| 5 | 0.60% | 0.02% | 14 | - 0.50% | 0.03% |
| 6 | - 1.90% | 0.09% | 15 | 0.43% | 0.02% |
| 7 | - 0.56% | 0.02% | 16 | - 0.26% | 0.07% |
| 8 | 0.08% | 0.01% | 17 | 0.10% | 0.02% |
| 9 | - 0.09% | 0.01% | 18 | 0.06% | 0.01% |
After experimental result is obtained, find that the electric energy meter in above table 3 marked as 6 misses after analyzing electric energy meter error
Difference is in higher situation, i.e., will be overproof, then the table is carried out at random by field personnel checking
Experimental verification shows using the algorithm without external perimysium reference instrument, actual relatively by mistake in known any electric energy meter
On the premise of difference, only pass through the analysis to electric energy meter cluster reading in tree topology, you can calculate other all electric energy meters
Error.The error calculation method of this autonomous type can perform online, so as to be expected to be substantially reducing at the maintenance of electric energy meter into
This.When known a certain instrument available accuracy grade rather than practical relative error, although other electric energy meters can not be calculated really
Relative error is cut, but the estimation of error range can be realized.This method can effectively lock doubtful overproof electric energy meter, make calibrating and school
Standard is shot the arrow at the target.
Although disclosing embodiments of the invention and accompanying drawing for the purpose of illustration, those skilled in the art can manage
Solution：Do not departing from the present invention and spirit and scope of the appended claims in, it is various replace, change and modifications all be it is possible,
Therefore, the scope of the present invention is not limited to embodiment and accompanying drawing disclosure of that.
Claims (7)
- A kind of 1. intelligent electric energy meter kinematic error remote calibration method, it is characterised in that：This method concretely comprises the following steps：(1) intelligent electric energy meter cluster is installed to form tree topology, can remotely obtain the summary table in the intelligent electric energy meter cluster And each point of flow-meter data；(2) the tree topology formed according to intelligent electric energy meter cluster, the flow conservation basis of the intelligent electric energy meter cluster is obtained Model；(3) line loss error is corrected, introduces virtual tributary dynamic corrections intelligent electric energy meter cluster topology model, while correct stream Conservation basic model is measured, obtains flow conservation algorithm model；(4) the current increment data of multiple intelligent electric energy meter cluster are obtained, by the electric current flow increasing of the intelligent electric energy meter cluster got Measure data and substitute into flow conservation algorithm model, calculate relative error；(5) result of calculation is modified and Evaluation of Uncertainty；(6) error calculation result is drawn.
- 2. intelligent electric energy meter kinematic error remote calibration method according to claim 1, it is characterised in that：The virtual branch Road replaces the failure values sum of circuit consume, and the virtual tributary includes Virtual Intelligent electric energy meter and dummy load.
- 3. intelligent electric energy meter kinematic error remote calibration method according to claim 1, it is characterised in that：The flow is kept Permanent basic model is：Y ε=- η.
- 4. intelligent electric energy meter kinematic error remote calibration method according to claim 1, it is characterised in that：The virtual branch The outflow on road is cluster summary table M0Reading increment subtract each point of table MjThe sum of (j=1 ..., n), and this value is multiplied by one The loss factor judged by empirical value；After adding virtual tributary, revised flow conservation algorithm model isα is amendment experience.
- 5. intelligent electric energy meter kinematic error remote calibration method according to claim 1, it is characterised in that：After the amendment The method for solving of flow conservation algorithm model be：The current increment data of the intelligent electric energy meter cluster of m=n-1 times are obtained, substitute into flow conservation algorithm model, wherein,yiFor ith measurement result vector；ε=(ε1 ε2 … εn-1)T；η= (y1,0ε0-α(y1,0x1,n) y2,0ε0-α(y2,0x2,n) … yn-1,0ε0-α(y1,0xn-1,n))T；To solve equation group, matrix Y is done into LU and decomposes Y=LU, z=U ε is made, obtains equation group Lz=- η, because L is lower triangle Battle array, easily solves z；Again because U is upper triangular matrix, ε is easily solved, and then obtain relative error δj。
- 6. intelligent electric energy meter kinematic error remote calibration method according to claim 1, it is characterised in that：The step is (4) The current increment data of multiple intelligent electric energy meter cluster are obtained, are located in advance, it is necessary to carry out data to continuous data storehouse before the computation Reason, filters out the stronger data of independence；The step of method of the data prediction, is followed successively by：Real-time test, data are complete Whole property inspection, data integration, lacuna processing, note abnormalities data and orthogonality of data analysis are examined.
- 7. intelligent electric energy meter kinematic error remote calibration method according to claim 1, it is characterised in that：It is described uncertain Spend the computational methods of evaluation：In the case of given initial experience value α=0, electric energy meter cluster error condition is calculated, if the meter Calculate result and meet confidence level requirement, that is, the overproof electric energy meter quantity calculated is less than in prescribed limit, then the algorithm terminates；Otherwise α value section is adjusted upward, returns to Algorithm for Solving.
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