CN110045212A - A kind of method and system that line loss per unit is evaluated based on electric energy metering device uncertainty - Google Patents
A kind of method and system that line loss per unit is evaluated based on electric energy metering device uncertainty Download PDFInfo
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- CN110045212A CN110045212A CN201910411957.8A CN201910411957A CN110045212A CN 110045212 A CN110045212 A CN 110045212A CN 201910411957 A CN201910411957 A CN 201910411957A CN 110045212 A CN110045212 A CN 110045212A
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- 230000005611 electricity Effects 0.000 claims description 24
- 238000011156 evaluation Methods 0.000 claims description 10
- 238000005259 measurement Methods 0.000 claims description 9
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- 230000015572 biosynthetic process Effects 0.000 description 6
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- 238000012360 testing method Methods 0.000 description 4
- 238000004458 analytical method Methods 0.000 description 2
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- 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
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Abstract
The invention discloses a kind of methods evaluated based on electric energy metering device uncertainty line loss per unit, which comprises determines the definition of statistical line losses rate；The composition error of the electric energy metering device component part of line loss per unit accuracy described in analyzing influence and the uncertainty of line loss per unit；Composition error and uncertainty based on the electric energy metering device component part evaluate the line loss per unit.
Description
Technical field
The present invention relates to Electric Energy Metering Technology fields, are based on electric energy metering device uncertainty more particularly, to one kind
The method and system that line loss per unit is evaluated.
Background technique
Line loss is a comprehensive economic and technical norms, can measure the technical management, operational management, metering of power supply enterprise
The level of management, power consumption management, operating management etc..In recent years, by transprovincially transmission line of electricity metering device, line load
The analysis of the data such as operating condition, critical point electricity statistical report form finds that negative wire damage situation occurs in the line loss per unit of many transmission lines of electricity, and more
Occur under the conditions of underloading.Since transmission line of electricity electricity exchange transprovincially is frequent and trading volume is huge, the appearance of negative wire damage can make to close
The accuracy of mouth metering is under suspicion with fairness, and easily leads to the problem of trade settlement or even cause legal dispute.
Therefore, it is necessary to a kind of technologies, are evaluated based on electric energy metering device uncertainty line loss per unit with realizing.
Summary of the invention
Technical solution of the present invention provides a kind of method evaluated based on electric energy metering device uncertainty line loss per unit
And system, line loss per unit is evaluated with solving the problems, such as how to be based on electric energy metering device uncertainty.
To solve the above-mentioned problems, the present invention provides one kind carries out line loss per unit based on electric energy metering device uncertainty
The method of evaluation, which comprises
Determine the definition of statistical line losses rate；
The composition error and line loss per unit of the electric energy metering device component part of line loss per unit accuracy described in analyzing influence are not
Degree of certainty；
Composition error and uncertainty based on the electric energy metering device component part evaluate the line loss per unit.
Preferably, the electric energy metering device component part includes: voltage transformer pt, Current Transmit, secondary returning
Road pressure drop, electric energy meter.
Preferably, statistical line losses rate is defined as:
Line loss per unit L=sending end electricity W1Receiving end electricity W2。
Preferably, the composition error of the electric energy metering device component part be electric energy metering device component part error it
With, comprising: error, the error of voltage transformer pt, the error of Current Transmit and the secondary circuit voltage drop of electric energy meter
The sum of caused resultant error.
Preferably, the uncertainty of the line loss per unit according to sending end electric energy metering device and receiving end electric energy metering device not
Degree of certainty synthesis.
Based on another aspect of the present invention, one kind is provided, line loss per unit is evaluated based on electric energy metering device uncertainty
System, the system comprises:
Determination unit, for determining the definition of statistical line losses rate；
Analytical unit, the composition error of the electric energy metering device component part for line loss per unit accuracy described in analyzing influence
And the uncertainty of line loss per unit；
Evaluation unit, composition error and uncertainty based on the electric energy metering device component part are to the line loss per unit
It is evaluated.
Preferably, the electric energy metering device component part includes: voltage transformer pt, Current Transmit, secondary returning
Road pressure drop, electric energy meter.
Preferably, statistical line losses rate is defined as:
Line loss per unit L=sending end electricity W1Receiving end electricity W2。
Preferably, the composition error of the electric energy metering device component part be electric energy metering device component part error it
With, comprising: error, the error of voltage transformer pt, the error of Current Transmit and the secondary circuit voltage drop of electric energy meter
The sum of caused resultant error.
Preferably, the uncertainty of the line loss per unit according to sending end electric energy metering device and receiving end electric energy metering device not
Degree of certainty synthesis.
Technical solution of the present invention provides a kind of method evaluated based on electric energy metering device uncertainty line loss per unit
With system, wherein method comprises determining that the definition of statistical line losses rate；The electric energy metering device group of analyzing influence line loss per unit accuracy
At the composition error of part and the uncertainty of line loss per unit；Composition error based on electric energy metering device component part and uncertain
Degree evaluates line loss per unit.Technical solution of the present invention provides statistics line in conjunction with uncertainty from the definition of statistical line losses
Relationship between loss rate and electric energy metering device composition error.
Detailed description of the invention
By reference to the following drawings, exemplary embodiments of the present invention can be more fully understood by:
Fig. 1 is to be based on electric energy metering device uncertainty according to preferred embodiment for the present invention one kind to comment line loss per unit
The method flow diagram of valence；
Fig. 2 is to be based on electric energy metering device uncertainty according to preferred embodiment for the present invention one kind to comment line loss per unit
The system construction drawing of valence.
Specific embodiment
Exemplary embodiments of the present invention are introduced referring now to the drawings, however, the present invention can use many different shapes
Formula is implemented, and is not limited to the embodiment described herein, and to provide these embodiments be at large and fully disclose
The present invention, and the scope of the present invention is sufficiently conveyed to person of ordinary skill in the field.Show for what is be illustrated in the accompanying drawings
Term in example property embodiment is not limitation of the invention.In the accompanying drawings, identical cells/elements use identical attached
Icon note.
Unless otherwise indicated, term (including scientific and technical terminology) used herein has person of ordinary skill in the field
It is common to understand meaning.Further it will be understood that with the term that usually used dictionary limits, should be understood as and its
The context of related fields has consistent meaning, and is not construed as Utopian or too formal meaning.
Fig. 1 is to be based on electric energy metering device uncertainty according to preferred embodiment for the present invention one kind to comment line loss per unit
Valence method flow diagram.The application obtains the calculation formula of route statistical line losses rate from the definition angle of statistical line losses rate, then
The error uncertainty of each section in convolution carries out the evaluation of statistical line losses rate.As shown in Figure 1, one kind is based on electric energy
The method that amount device uncertainty evaluates line loss per unit, method include:
Preferably, in step 101: determining the definition of statistical line losses rate.The application statistical line losses is defined as:
Statistical line losses (L)=sending end electricity (W1)-receiving end electricity (W2)(1)
Find out from formula (1), the accuracy of statistical line losses rate depends on the accuracy of electric energy measurement.And charge value W's is accurate
Property depend on electric energy metering device, it may be assumed that voltage transformer (PT), current transformer (CT), secondary circuit voltage drop, electric energy meter four
Divide measurement accuracy, the error change of each component part of electric energy metering device generates composition error value and its uncertainty straight
Connect influence.The application combines the on-site test value of practical transmission line of electricity, and the measurement of analysis each component part of electric energy metering device misses
Difference calculates composition error and its uncertainty, and then analyzes the rational evaluation method of statistical line losses.
Preferably, in step 102: the composition error of the electric energy metering device component part of analyzing influence line loss per unit accuracy
And the uncertainty of line loss per unit.
The electric energy metering device of the application is made of electric energy meter, current transformer, voltage transformer and its secondary circuit, respectively
There is error in a part and can measure respectively, DL/T1664-2016 " electric energy metering device inspection procedure " and " electrical energy measurement
Device field test job instruction " in regulation, the composition error of stoichiometric point include constitute electric energy metering device each section miss
Difference, specifically:
(1) error of electric energy meter；
(2) error of voltage transformer；
(3) error of current transformer；
(4) resultant error caused by Voltage Transformer Secondary Circuit Voltage Drop.
The comprehensive error computation that professional standard DL/T1664-2016 " electric energy metering device field test regulation " annex provides
Method is as follows:
Resultant error: metering electric current, the ratio difference of voltage transformer and phase difference and metering voltage transformer two
Error estimate formula of the quadrature component, in-phase component of minor loop pressure drop when measuring power.
Composition error: electric energy meter error and metering transformer error and metering Secondary Circuit of Potential Transformer pressure drop
The algebraical sum of resultant error.
The active single metering composition error γ of three-phase and four-line is the resultant error γ of electric current, voltage transformerh, voltage transformer
Secondary lead wires voltage drop error γd, the error γ of electrical energy measurement uniteBetween algebraical sum.It is indicated respectively with formula (2) to formula (4).
γ=γh+γd+γe(2)
In formula:
fI1And δI1, fV1And δV1For the error of first element electric current, voltage transformer；
fI2And δI2, fV2And δV2For the error of second element electric current, voltage transformer；
fI3And δI3, fV3And δV3For the error of third element electric current, voltage transformer；
For power-factor angle；
f1And δ1For first element voltage transformer secondary lead voltage drop error；
f2And δ2For second element voltage transformer secondary lead voltage drop error；
f3And δ3For third element voltage transformer secondary lead voltage drop error.
Preferably, in step 103: composition error and uncertainty based on electric energy metering device component part are to line loss per unit
It is evaluated.
Preferably, electric energy metering device component part includes: voltage transformer pt, Current Transmit, secondary circuit pressure
Drop, electric energy meter.
Preferably, statistical line losses rate is defined as:
Line loss per unit L=sending end electricity W1Receiving end electricity W2。
Preferably, the composition error of electric energy metering device component part is the sum of electric energy metering device component part error,
It include: that the error of electric energy meter, the error of voltage transformer pt, the error of Current Transmit and secondary circuit voltage drop cause
The sum of resultant error.
Preferably, the uncertainty of line loss per unit is according to the uncertain of sending end electric energy metering device and receiving end electric energy metering device
Degree synthesis.
The application evaluates the error uncertainty of each component part of electric energy metering device respectively.Composition error is equal to electricity
The sum of pressure, current transformer resultant error, secondary voltage drop resultant error, electric energy meter error, due to voltage transformer, Current Mutual Inductance
Device, secondary voltage drop resultant error, electric energy meter error be during the test it is independent, therefore, composition error uncertainty evaluation
The first step is to calculate separately the uncertainty of four component parts.Second step is the remittance for carrying out each component part partial uncertainty
Total and calculating.
From the definition of statistical line losses rate, if transmission line of electricity sending end actual power is P1, electric energy metering device synthesis
Error is ε1；Receiving end actual power is P2, electric energy metering device composition error is ε2；Transmission line of electricity technical loss rate is εL, that
The statistical line losses rate ε of routeTCalculation formula are as follows:
Uncertainty is ε by technical loss rateTUncertainty, the composition error of sending end electric energy metering device it is uncertain
The uncertainty of degree and receiving end electric energy metering device composition error determines.Due to technical loss rate, sending end electric energy metering device
It is uncorrelated between composition error and receiving end electric energy metering device composition error, therefore, the uncertainty of statistical line losses rate are as follows:
Research relates generally to influence of the electric energy measurement to statistical line losses accuracy, and therefore, setting technique line loss per unit is true value,
Its uncertainty is not considered, then the uncertainty of statistical line losses rate are as follows:
The route statistical line losses rate ε it can be seen from formula 6TSize by technical loss rate, sending end, receiving end electrical energy measurement dress
The composition error set determines.By formula 7 it is found that the uncertainty of statistical line losses rate is by sending the uncertainty of receiving end electric energy metering device
Synthesis, determines the zone of reasonableness of statistical line losses rate.
For the application embodiment from the definition angle of statistical line losses rate, the calculating for obtaining route statistical line losses rate is public
Formula carries out the evaluation of statistical line losses rate in conjunction with the error uncertainty of each section in formula.The application efficiently solves can not
Judge under transmission line of electricity light load condition, statistical line losses be negative value the case where.
Fig. 2 is to be based on electric energy metering device uncertainty according to preferred embodiment for the present invention one kind to comment line loss per unit
The system construction drawing of valence.As shown in Fig. 2, a kind of system that line loss per unit is evaluated based on electric energy metering device uncertainty,
System includes:
Determination unit 201, for determining the definition of statistical line losses rate；
Analytical unit 202, the composition error of the electric energy metering device component part for analyzing influence line loss per unit accuracy
And the uncertainty of line loss per unit；
Evaluation unit 203, composition error and uncertainty based on electric energy metering device component part carry out line loss per unit
Evaluation.
Preferably, electric energy metering device component part includes: voltage transformer pt, Current Transmit, secondary circuit pressure
Drop, electric energy meter.
Preferably, statistical line losses rate is defined as:
Line loss per unit L=sending end electricity W1Receiving end electricity W2。
Preferably, the composition error of electric energy metering device component part is the sum of electric energy metering device component part error,
It include: that the error of electric energy meter, the error of voltage transformer pt, the error of Current Transmit and secondary circuit voltage drop cause
The sum of resultant error.
Preferably, the uncertainty of line loss per unit is according to the uncertain of sending end electric energy metering device and receiving end electric energy metering device
Degree synthesis.
The present invention is described by reference to a small amount of embodiment.However, it is known in those skilled in the art, as
Defined by subsidiary Patent right requirement, in addition to the present invention other embodiments disclosed above equally fall in it is of the invention
In range.
Normally, all terms used in the claims are all solved according to them in the common meaning of technical field
It releases, unless in addition clearly being defined wherein.All references " one/described/be somebody's turn to do [device, component etc.] " are all opened ground
At least one example being construed in described device, component etc., unless otherwise expressly specified.Any method disclosed herein
Step need not all be run with disclosed accurate sequence, unless explicitly stated otherwise.
Claims (10)
1. a kind of method evaluated based on electric energy metering device uncertainty line loss per unit, which comprises
Determine the definition of statistical line losses rate；
The composition error of the electric energy metering device component part of line loss per unit accuracy described in analyzing influence and not knowing for line loss per unit
Degree；
Composition error and uncertainty based on the electric energy metering device component part evaluate the line loss per unit.
2. according to the method described in claim 1, the electric energy metering device component part includes: voltage transformer pt, electric current
Mutual inductor CT, secondary circuit voltage drop, electric energy meter.
3. according to the method described in claim 1, statistical line losses rates is defined as:
Line loss per unit L=sending end electricity W1Receiving end electricity W2。
4. according to the method described in claim 1, the composition error of the electric energy metering device component part is electrical energy measurement dress
Set the sum of component part error, comprising: the error of electric energy meter, the error of voltage transformer pt, the error of Current Transmit with
And the sum of caused resultant error drops in secondary circuit voltage.
5. according to the method described in claim 1, the uncertainty of the line loss per unit is according to sending end electric energy metering device and receiving end
The uncertainty combination of electric energy metering device.
6. a kind of system that line loss per unit is evaluated based on electric energy metering device uncertainty, the system comprises:
Determination unit, for determining the definition of statistical line losses rate；
Analytical unit, the composition error and line of the electric energy metering device component part for line loss per unit accuracy described in analyzing influence
The uncertainty of loss rate；
Evaluation unit, composition error and uncertainty based on the electric energy metering device component part carry out the line loss per unit
Evaluation.
7. system according to claim 6, the electric energy metering device component part includes: voltage transformer pt, electric current
Mutual inductor CT, secondary circuit voltage drop, electric energy meter.
8. system according to claim 6, statistical line losses rate is defined as:
Line loss per unit L=sending end electricity W1Receiving end electricity W2。
9. system according to claim 6, the composition error of the electric energy metering device component part is electrical energy measurement dress
Set the sum of component part error, comprising: the error of electric energy meter, the error of voltage transformer pt, the error of Current Transmit with
And the sum of caused resultant error drops in secondary circuit voltage.
10. system according to claim 6, the uncertainty of the line loss per unit is according to sending end electric energy metering device and receiving end
The uncertainty combination of electric energy metering device.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110954767A (en) * | 2019-12-05 | 2020-04-03 | 武汉华瑞智深电气技术有限公司 | Accurate analysis method for power line loss |
| CN115236394A (en) * | 2022-09-22 | 2022-10-25 | 南方电网数字电网研究院有限公司 | Power transmission line carbon emission metering method and device, computer equipment and storage medium |
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| CN109270482A (en) * | 2018-11-15 | 2019-01-25 | 国网河北省电力有限公司电力科学研究院 | Voltage transformer accuracy of measuring on-line evaluation method and terminal device |
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- 2019-05-17 CN CN201910411957.8A patent/CN110045212A/en active Pending
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| JP2007221975A (en) * | 2006-02-20 | 2007-08-30 | Chugoku Electric Power Co Inc:The | Device and method for evaluating power distribution system |
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| CN110954767A (en) * | 2019-12-05 | 2020-04-03 | 武汉华瑞智深电气技术有限公司 | Accurate analysis method for power line loss |
| CN115236394A (en) * | 2022-09-22 | 2022-10-25 | 南方电网数字电网研究院有限公司 | Power transmission line carbon emission metering method and device, computer equipment and storage medium |
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