CN102279320A - Method for determining line loss rate reasonable range based on error analysis - Google Patents

Method for determining line loss rate reasonable range based on error analysis Download PDF

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CN102279320A
CN102279320A CN2011100923431A CN201110092343A CN102279320A CN 102279320 A CN102279320 A CN 102279320A CN 2011100923431 A CN2011100923431 A CN 2011100923431A CN 201110092343 A CN201110092343 A CN 201110092343A CN 102279320 A CN102279320 A CN 102279320A
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China
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error
line loss
watt
hour meter
electricity
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谢邦鹏
王立峰
洪俊
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SHANGHAI RUNPOWER INFORMATION TECHNOLOGY Co Ltd
State Grid Corp of China SGCC
Shanghai Municipal Electric Power Co
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SHANGHAI RUNPOWER INFORMATION TECHNOLOGY Co Ltd
Shanghai Municipal Electric Power Co
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Abstract

The invention provides a method for determining a line loss rate reasonable range based on an error analysis. The method comprises the following steps: calculating a technical line loss rate according to a physical parameter of a line, calculating an electrically measuring error caused by precision of measuring equipment and an error caused by measuring time, and accumulating a precision error and a measuring time error based on the technical line loss rate to obtain the line loss rate reasonable range of the line. According to the invention, line loss rationality of the line can be determined accurately.

Description

A kind of based on the error analysis method of alignment loss rate reasonable interval really
Technical field
The present invention relates to a kind of based on the error analysis method of alignment loss rate reasonable interval really.
Background technology
At present, known definite circuit line loss whether reasonable method is to rely on theory wire loss, and the people is for estimating amplification on theoretical line loss basis, and reasonable interval is that theory wire loss value and estimated value add up and form like this.People are in this value of estimation, tend to estimate too for a short time or too big, promptly can't have clear and definite means or an algorithm to draw this value, the result who draws is often also unreasonable, cause misjudgment easily, can't for oppose electricity-stealing, saving energy and decreasing loss work provides foundation.
Summary of the invention
Provided by the invention a kind of based on the error analysis method of alignment loss rate reasonable interval really, can determine the rationality of circuit line loss more accurately.
In order to achieve the above object, the invention provides a kind ofly, comprise following steps based on the error analysis method of alignment loss rate reasonable interval really:
The trueness error of step 1, calculating measuring equipment;
The precision relative error of watt-hour meter
Figure 99360DEST_PATH_IMAGE001
For:
Figure 323668DEST_PATH_IMAGE002
，
Figure 713061DEST_PATH_IMAGE003
Wherein, The error that the electricity that watt-hour meter is gathered for the measuring error of voltage transformer (VT) and current transformer produces,
Figure 206676DEST_PATH_IMAGE005
The relative error of the measurement electric degree reading that causes for watt-hour meter,
Figure 234675DEST_PATH_IMAGE006
Be the relative error of active power,
Figure 603208DEST_PATH_IMAGE007
The electric current relative error of the measurement that causes for current transformer, The voltage relative error of the measurement that causes for voltage transformer (VT);
Step 2, calculating acquisition system Measuring Time error;
In the line loss comparison work of carrying out at present, generally use " my god " carry out the electricity reading relative error that the data read time causes as unit
Figure 755021DEST_PATH_IMAGE009
For:
Figure 321131DEST_PATH_IMAGE010
Wherein,
Figure 685116DEST_PATH_IMAGE011
Be preset threshold;
Step 3, calculating electricity relative error
Figure 311270DEST_PATH_IMAGE012
Figure 495127DEST_PATH_IMAGE013
The technology line loss per unit of step 4, computational scheme;
The technology line loss per unit
Figure 864928DEST_PATH_IMAGE014
For:
Figure 83420DEST_PATH_IMAGE015
Wherein,
Figure 880474DEST_PATH_IMAGE016
Be the technology line loss,
Figure 551627DEST_PATH_IMAGE017
Be the supply side electricity,
Figure 459540DEST_PATH_IMAGE018
Be the average line loss power,
Figure 2011100923431100002DEST_PATH_IMAGE019
Be computing time;
Line loss power
Figure 538398DEST_PATH_IMAGE020
To the time
Figure 568671DEST_PATH_IMAGE019
Carry out integration and can obtain line loss
Figure 664803DEST_PATH_IMAGE016
Figure 438724DEST_PATH_IMAGE021
Wherein,
Figure 303912DEST_PATH_IMAGE022
With
Figure 442769DEST_PATH_IMAGE023
Be respectively the meritorious and reactive power that circuit transmits, Be line voltage distribution,
Figure 603809DEST_PATH_IMAGE025
Be line impedance;
Step 5, determine the reasonable interval of circuit line loss per unit;
Figure 385820DEST_PATH_IMAGE026
Wherein,
Figure 695579DEST_PATH_IMAGE027
With
Figure 828620DEST_PATH_IMAGE028
Be respectively statistics line loss per unit and technology line loss per unit,
Figure 882026DEST_PATH_IMAGE029
Be the error of calculation in the special line line loss comparison process;
Wherein,
Figure 264783DEST_PATH_IMAGE031
With It is respectively the supply side electricity
Figure 476639DEST_PATH_IMAGE033
With sale of electricity side electricity
Figure 233242DEST_PATH_IMAGE034
Relative error,
Figure 150383DEST_PATH_IMAGE035
Figure 992437DEST_PATH_IMAGE036
Finally obtain adding up line loss per unit
Figure 387646DEST_PATH_IMAGE027
Reasonable interval:
Figure 264335DEST_PATH_IMAGE037
?。
In step 1, if
Figure 86798DEST_PATH_IMAGE038
Adding and the situation of (similar when subtracting each other) of individual watt-hour meter reading, promptly
Figure 353831DEST_PATH_IMAGE039
, wherein,
Figure 615048DEST_PATH_IMAGE040
Be watt-hour meter
Figure 283927DEST_PATH_IMAGE041
The electricity reading,
Figure 339607DEST_PATH_IMAGE042
Be the total degrees of ammeters that calculates, then the absolute error of m watt-hour meter is:
Figure 156254DEST_PATH_IMAGE043
Wherein,
Figure 893265DEST_PATH_IMAGE044
Be watt-hour meter
Figure 478968DEST_PATH_IMAGE041
Relative error.
The present invention can determine the rationality of circuit line loss more accurately.
Embodiment
Below specify preferred embodiment of the present invention:
A kind of based on the error analysis method of alignment loss rate reasonable interval really, comprise following steps:
The trueness error of step 1, calculating measuring equipment;
Measuring equipment mainly comprises current transformer (CT), voltage transformer (VT) (PT), watt-hour meter etc., and the error that the measuring accuracy of these equipment causes will cause the reading of watt-hour meter error to occur.
The current error of supposing the measurement that current transformer causes is
Figure 908812DEST_PATH_IMAGE007
, the measuring voltage error that voltage transformer (VT) causes is
Figure 150437DEST_PATH_IMAGE008
, the measurement electric degree reading error that watt-hour meter causes is
Figure 487878DEST_PATH_IMAGE005
(three is relative error).
Because active power
Figure 131349DEST_PATH_IMAGE045
(putting aside the different situation of measuring error, measured value of three-phase), and the watt-hour meter reading is the integrated value of active power, can think a plurality of unit interval section internal powers add up and, so can think the watt-hour meter reading
Figure 546410DEST_PATH_IMAGE046
Error and active power
Figure 275332DEST_PATH_IMAGE022
Error identical.Therefore, the measuring error of current transformer and voltage transformer (VT) will cause error to the electricity that watt-hour meter is gathered.
The error that the angle of not considering to measure causes is only considered voltage
Figure 416463DEST_PATH_IMAGE024
And electric current
Figure 914441DEST_PATH_IMAGE047
Measuring error, the electricity that the measuring error of voltage transformer (VT) and current transformer will make watt-hour meter gather produces error
Figure 748404DEST_PATH_IMAGE004
, can obtain according to error calculation method:
Figure 699043DEST_PATH_IMAGE003
（2）
To watt-hour meter, itself measured electric degree reading just has error
Figure 643865DEST_PATH_IMAGE005
, the measuring error that this error and voltage, current transformer cause watt-hour meter
Figure 996349DEST_PATH_IMAGE004
Be the relation of adding up, the precision relative error that promptly obtains watt-hour meter is:
（3）
If Adding and the situation of (similar when subtracting each other) of individual watt-hour meter reading, promptly , wherein, Be watt-hour meter The electricity reading,
Figure 495649DEST_PATH_IMAGE042
Be the total degrees of ammeters that calculates, then the absolute error of m watt-hour meter is:
Figure 719957DEST_PATH_IMAGE043
（4）
Wherein,
Figure 843771DEST_PATH_IMAGE044
Be watt-hour meter Relative error.
With Shanghai Pudong District is example, and the electric energy measurement equipment precision grade of use is mainly:
Current transformer: the dry-type current transformer that mainly uses companies such as Siemens, ABB to produce, accuracy class is generally 0.5s, i.e. current error of Ce Lianging
Figure 602966DEST_PATH_IMAGE048
Voltage transformer (VT): the dry-type voltage inductor that mainly uses companies such as mutual inductance device factory, Shanghai, ABB to produce, accuracy class is generally 0.5s, i.e. voltage error of Ce Lianging
Figure 630965DEST_PATH_IMAGE049
Watt-hour meter: the watt-hour meter that mainly uses wasion and land company of section to produce, to individual line subscriber, it send electric side and the equal installation accuracy of user side is the watt-hour meter of 0.5s, its error is
Figure 874864DEST_PATH_IMAGE050
According to formula (2), can obtain the error that the measuring error of voltage transformer (VT) and current transformer will cause the electricity that watt-hour meter is gathered and be:
Figure 64537DEST_PATH_IMAGE051
According to formula (3), the total error that can obtain single 0.5s level watt-hour meter is:
Figure 26677DEST_PATH_IMAGE052
Step 2, calculating acquisition system Measuring Time error;
Area, Shanghai reading mainly of load data is at present undertaken by cable shield carrier wave and GPRS wireless data platform dual mode.No matter which kind of data read mode of use in reading process, all uses the question and answer mode stipulations of regulation to carry out communication.According to the stipulations regulation, when carrying out data upload, will compare to the time of equipment such as watt-hour meter, load instrument for measuring and recording.If time error surpass certain setting value (
Figure 592787DEST_PATH_IMAGE011
), will the clock of watt-hour meter be provided with again.Therefore, can think that when carrying out the comparison of distribution line line loss, the time for reading of data exists
Figure 956773DEST_PATH_IMAGE011
Absolute error.
In the line loss comparison work of carrying out at present, generally use " my god " carry out as unit.Therefore, can think that the electricity reading relative error that the data read time causes is:
Figure 317347DEST_PATH_IMAGE010
（5）
In the question and answer mode stipulations of regulation, the threshold value of the time error of setting
Figure 766783DEST_PATH_IMAGE011
Be 5 minutes, can get the Measuring Time error according to formula (5) and be:
Figure 136584DEST_PATH_IMAGE053
Step 3, calculating electricity relative error
Figure 27180DEST_PATH_IMAGE012
Measuring Time error and device measuring trueness error are separate errors, therefore, to uploading to the watt-hour meter data of main station system, the influence of these two errors adds up, can directly carry out addition during calculating, promptly watt-hour meter uploads to the electricity relative error of main website and is:
（6）
Therefore, according to formula (6), to 0.5s level watt-hour meter, its electricity information error that uploads to main website is:
Figure 495387DEST_PATH_IMAGE054
The technology line loss per unit of step 4, computational scheme;
Circuit technology line loss mainly comprises line loss, and line loss power is:
（7）
Wherein,
Figure 741878DEST_PATH_IMAGE022
With
Figure 772151DEST_PATH_IMAGE023
Be respectively the meritorious and reactive power that circuit transmits,
Figure 868283DEST_PATH_IMAGE024
Be line voltage distribution,
Figure 648063DEST_PATH_IMAGE025
Be line impedance.
Line loss power
Figure 513251DEST_PATH_IMAGE020
To the time Carry out integration and can obtain line loss
Figure 297853DEST_PATH_IMAGE016
Further, obtaining the technology line loss per unit is:
Figure 609886DEST_PATH_IMAGE015
（8）
Wherein,
Figure 595159DEST_PATH_IMAGE016
Be the technology line loss,
Figure 967235DEST_PATH_IMAGE017
Be the supply side electricity,
Figure 37959DEST_PATH_IMAGE018
Be the average line loss power,
Figure 91366DEST_PATH_IMAGE019
Be computing time.
Specifically to hand over silver-colored second circuit be example to spend 23, and this circuit is 10 kilovolts of special lines power supplies, at supply side () and user side electric energy meter (reaching associated voltage mutual inductor and current transformer etc.) all is installed at the station, garden in and carries out electrical measurement.
Data with on April 22nd, 2010 are analyzed, and its statistics line loss is calculated as shown in table 1.
Table 1 spends 23 to hand over silver-colored second circuit line loss one day computation sheet
Line name Delivery (kWh) Electricity sales amount (kWh) Statistics line loss (kWh) The statistics line loss per unit
Spend 23 to hand over silver-colored second 13128 12978 150 1.14%
Spend 23 to hand over silver-colored second special line always to be about 2.1706 kms, mainly use YJV type crosslinked polyethylene copper core cable, the sub-thread sectional area is 240mm 2Therefore, this conductor resistance is about:
Figure 993463DEST_PATH_IMAGE055
The same day, transmission power was 13128 when spending, and its active power P is about 547 kilowatts.Put aside reactive power, i.e. Q=0, the time is 24 hours, can get the technology line loss according to formula (7), formula (8) to be:
The technology line loss per unit is:
Figure 828880DEST_PATH_IMAGE057
Step 5, determine the reasonable interval of circuit line loss per unit;
Because the existence of error has been arranged, judge that line loss per unit, should be on the basis of technology line loss whether rationally the time, the influence of consideration error.Therefore, judging the reasonable interval of statistics line loss per unit, should be the reasonable interval of considering the line loss per unit that error condition obtains on the basis of Molded Line loss rate, that is:
Figure 685978DEST_PATH_IMAGE026
（9）
Wherein,
Figure 442581DEST_PATH_IMAGE027
With Be respectively statistics line loss per unit and technology line loss per unit, Be the error of calculation in the special line line loss comparison process.
Because special line statistics line loss is supply side and is subjected to the poor of electric side electric weight that according to formula (4) as can be known, the absolute error of special line statistics line loss is:
（10）
In the formula,
Figure 208095DEST_PATH_IMAGE031
With
Figure 296137DEST_PATH_IMAGE032
It is respectively the supply side electricity
Figure 625487DEST_PATH_IMAGE033
With sale of electricity side electricity
Figure 824387DEST_PATH_IMAGE034
Relative error.
Because the base value of statistics line loss per unit, Molded Line loss rate all is the supply side electric weight
Figure 290003DEST_PATH_IMAGE033
, and generally have
Figure 548946DEST_PATH_IMAGE035
, according to formula (10), can obtain:
Figure 303276DEST_PATH_IMAGE036
（11）
Formula (11) substitution formula (9) can be got:
Figure 102605DEST_PATH_IMAGE037
（12）
Formula (12) is in the special line line loss comparison process, and reasonably whether the statistics line loss computing method in interval.
Be example to spend the silver-colored second circuit of 23 friendships specifically, this line powering side is voltage transformer (VT), current transformer and the electric energy meter of 0.5s with being subjected to the equal service rating of electric side, so delivery
Figure 625990DEST_PATH_IMAGE033
And electricity sales amount
Figure 118151DEST_PATH_IMAGE034
Error is 1.56%, promptly
Figure 94197DEST_PATH_IMAGE058
According to formula (12) as can be known, statistics line loss
Figure 697217DEST_PATH_IMAGE059
Whether reasonably interval should be:
Figure 340688DEST_PATH_IMAGE060
Therefore, statistics line loss
Figure 738171DEST_PATH_IMAGE059
Reasonable interval should be [2.13%, 2.29%], promptly add up line loss and should think in this is interval the time rational.Spending the statistics line loss per unit of the silver-colored second of 23 friendships on April 22 is 1.14%, within this interval, is rational.
Although content of the present invention has been done detailed introduction by above preferred embodiment, will be appreciated that above-mentioned description should not be considered to limitation of the present invention.After those skilled in the art have read foregoing, for multiple modification of the present invention with to substitute all will be conspicuous.Therefore, protection scope of the present invention should be limited to the appended claims.

Claims (2)

1. one kind based on the error analysis method of alignment loss rate reasonable interval really, it is characterized in that the method includes the steps of:
The trueness error of step 1, calculating measuring equipment;
The precision relative error of watt-hour meter
Figure 239118DEST_PATH_IMAGE001
For:
Figure 696644DEST_PATH_IMAGE002
，
Wherein,
Figure 395796DEST_PATH_IMAGE004
The error that the electricity that watt-hour meter is gathered for the measuring error of voltage transformer (VT) and current transformer produces,
Figure 662829DEST_PATH_IMAGE005
The relative error of the measurement electric degree reading that causes for watt-hour meter,
Figure 658467DEST_PATH_IMAGE006
Be the relative error of active power,
Figure 327346DEST_PATH_IMAGE007
The electric current relative error of the measurement that causes for current transformer,
Figure 648605DEST_PATH_IMAGE008
The voltage relative error of the measurement that causes for voltage transformer (VT);
Step 2, calculating acquisition system Measuring Time error;
In the line loss comparison work of carrying out at present, use " my god " carry out the electricity reading relative error that the data read time causes as unit For:
Figure 208123DEST_PATH_IMAGE010
Wherein, Be preset threshold;
Step 3, calculating electricity relative error
Figure 958090DEST_PATH_IMAGE012
Figure 199716DEST_PATH_IMAGE013
The technology line loss per unit of step 4, computational scheme;
The technology line loss per unit
Figure 740418DEST_PATH_IMAGE014
For:
Figure 180627DEST_PATH_IMAGE015
Wherein,
Figure 781373DEST_PATH_IMAGE016
Be the technology line loss,
Figure 307032DEST_PATH_IMAGE017
Be the supply side electricity,
Figure 651426DEST_PATH_IMAGE018
Be the average line loss power, Be computing time;
Line loss power
Figure 717788DEST_PATH_IMAGE021
To the time
Figure 996322DEST_PATH_IMAGE020
Carry out integration and can obtain line loss
Figure 878828DEST_PATH_IMAGE016
Figure 293628DEST_PATH_IMAGE022
Wherein,
Figure 970597DEST_PATH_IMAGE023
With
Figure 470849DEST_PATH_IMAGE024
Be respectively the meritorious and reactive power that circuit transmits, Be line voltage distribution,
Figure 426352DEST_PATH_IMAGE026
Be line impedance;
Step 5, determine the reasonable interval of circuit line loss per unit;
Figure 539802DEST_PATH_IMAGE027
Wherein,
Figure 465033DEST_PATH_IMAGE028
With
Figure 751657DEST_PATH_IMAGE029
Be respectively statistics line loss per unit and technology line loss per unit,
Figure 78734DEST_PATH_IMAGE030
Be the error of calculation in the special line line loss comparison process;
Figure 425401DEST_PATH_IMAGE031
Wherein,
Figure 572349DEST_PATH_IMAGE032
With It is respectively the supply side electricity
Figure 844247DEST_PATH_IMAGE034
With sale of electricity side electricity
Figure 361816DEST_PATH_IMAGE035
Relative error,
Figure 890067DEST_PATH_IMAGE037
Finally obtain adding up line loss per unit
Figure 926156DEST_PATH_IMAGE028
Reasonable interval:
Figure 614626DEST_PATH_IMAGE038
?。
2. as claimed in claim 1ly it is characterized in that based on the error analysis method of alignment loss rate reasonable interval really, in step 1, if Adding and the situation of (similar when subtracting each other) of individual watt-hour meter reading, promptly
Figure 168284DEST_PATH_IMAGE040
, wherein,
Figure 324459DEST_PATH_IMAGE041
Be watt-hour meter The electricity reading,
Figure 810245DEST_PATH_IMAGE043
Be the total degrees of ammeters that calculates, then the absolute error of m watt-hour meter is:
Figure 718158DEST_PATH_IMAGE044
Wherein,
Figure 791156DEST_PATH_IMAGE045
Be watt-hour meter
Figure 759112DEST_PATH_IMAGE042
Relative error.
CN2011100923431A 2011-04-13 2011-04-13 Method for determining line loss rate reasonable range based on error analysis Pending CN102279320A (en)

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Publication number Priority date Publication date Assignee Title
CN102628900A (en) * 2012-03-23 2012-08-08 上海市电力公司 Line loss information sectionalized detection method based on meter bottom value
CN104111379A (en) * 2013-04-19 2014-10-22 国家电网公司 Transformer district line loss rate flexible analysis algorithm process
CN104239692A (en) * 2014-08-22 2014-12-24 国家电网公司 Energy meter data accuracy compensation algorithm-based line loss abnormality judging method
CN104635080A (en) * 2015-01-29 2015-05-20 国网河南省电力公司鹤壁供电公司 Method for predicating line loss rate of power grid
CN106096290A (en) * 2016-06-16 2016-11-09 广西电网有限责任公司电力科学研究院 A kind of method of modified line loss rate
CN106229969A (en) * 2014-09-12 2016-12-14 国网安徽省电力公司电力科学研究院 Electric network element based on cumulative statistics line loss per unit loss abnormality judgment method
CN110045212A (en) * 2019-05-17 2019-07-23 中国电力科学研究院有限公司 A kind of method and system that line loss per unit is evaluated based on electric energy metering device uncertainty
CN112365703A (en) * 2020-11-02 2021-02-12 深圳市科陆电子科技股份有限公司 Method and device for collecting daily freezing data of electric energy meter
CN112798899A (en) * 2021-04-06 2021-05-14 国网山东省电力公司昌邑市供电公司 Method, device, terminal and storage medium for checking line loss abnormity influence factors
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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Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102628900A (en) * 2012-03-23 2012-08-08 上海市电力公司 Line loss information sectionalized detection method based on meter bottom value
CN104111379A (en) * 2013-04-19 2014-10-22 国家电网公司 Transformer district line loss rate flexible analysis algorithm process
CN104239692B (en) * 2014-08-22 2017-07-18 国家电网公司 A kind of line loss abnormality determination method based on electric energy meter data precision backoff algorithm
CN104239692A (en) * 2014-08-22 2014-12-24 国家电网公司 Energy meter data accuracy compensation algorithm-based line loss abnormality judging method
CN106229969B (en) * 2014-09-12 2019-06-28 国网安徽省电力公司电力科学研究院 Abnormality judgment method is lost in electric network element based on cumulative statistics line loss per unit
CN106229969A (en) * 2014-09-12 2016-12-14 国网安徽省电力公司电力科学研究院 Electric network element based on cumulative statistics line loss per unit loss abnormality judgment method
CN104635080B (en) * 2015-01-29 2017-11-17 国网河南省电力公司鹤壁供电公司 A kind of method for predicting grid line loss rate
CN104635080A (en) * 2015-01-29 2015-05-20 国网河南省电力公司鹤壁供电公司 Method for predicating line loss rate of power grid
CN106096290A (en) * 2016-06-16 2016-11-09 广西电网有限责任公司电力科学研究院 A kind of method of modified line loss rate
CN106096290B (en) * 2016-06-16 2019-01-22 广西电网有限责任公司电力科学研究院 A method of amendment line loss per unit
CN110045212A (en) * 2019-05-17 2019-07-23 中国电力科学研究院有限公司 A kind of method and system that line loss per unit is evaluated based on electric energy metering device uncertainty
CN112365703A (en) * 2020-11-02 2021-02-12 深圳市科陆电子科技股份有限公司 Method and device for collecting daily freezing data of electric energy meter
CN112798899A (en) * 2021-04-06 2021-05-14 国网山东省电力公司昌邑市供电公司 Method, device, terminal and storage medium for checking line loss abnormity influence factors
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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