CN105044451A - Power compensation optimizing method used in electric energy meter replacement in live working state based on least square method curve fitting - Google Patents
Power compensation optimizing method used in electric energy meter replacement in live working state based on least square method curve fitting Download PDFInfo
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Abstract
Provided is a power compensation optimizing method used in electric energy meter replacement in a live working state based on least square method curve fitting. The method comprises the following steps of: connecting the voltage wire of a three-phase electric energy meter field calibrator with a loop in parallel and connecting the current wire of the three-phase electric energy meter field calibrator with the loop in series before an electric energy meter is replaced; when the electric energy meter is replaced, reliably connecting the secondary current test terminals of the replaced electric energy meter in a short circuit manner and measuring a current value by using a clamp ammeter in order to determine whether reliable short-circuit connection is achieved, starting a stopwatch to record replacing time; acquiring active power discrete points p(tn) within a time segment from t1 to t2 by using the three-phase electric energy meter field calibrator when replacement begins, acquiring a power curve function p(t) by using a least square method curve fitting method according to discrete point sampling values, and computing total active power lost in a meter replacing process by using a relation between power and time. The method improves the accuracy of metering results and guarantees the economic interests of a power seller and a power buyer.
Description
Technical field
Patent of the present invention belongs to Electric Energy Metering Technology field, is more specifically the live replacement of electric energy meter electric quantity compensating optimization method based on least square curve fit.
Background technology
It is the work on the spot comparatively frequently that measurement centre electric energy metrical professional is engaged in that gate energy meter is changed, for ensureing that not affecting normal electricity produces and run, Electric Energy Tariff Point Metering Device renovates and adopts the online mode changed to carry out, so just relate to dismounting gate energy meter and can produce electric quantity loss during this period of time, corresponding compensation must be carried out, to ensure the economic interests of run unit by electric quantity loss during swap table.But in real work; usually changing the compensation scheme adopted in table process is before pulling down old gate energy meter, record the instantaneous voltage of gate energy meter, electric current, power and power factor; be shorted to the correct time of recovery from secondary current loop with stopwatch record simultaneously; the electric quantity loss during changing table is estimated as the average power during changing table to change the instantaneous power before table, and when the compensation electricity increased in monthly billing electricity during this part changes table.
But Source of Gateway Meter finds in changing at the scene, and above-mentioned scheme has comparatively big error when load variations is larger, is not optimal electricity compensation way.Owing to cannot accomplish accurate-metering electricity during this period of time at all, can only by manually carrying out measurements and calculations, and there is very large error, so a lot of Electricity customers is not approved the electricity of remedying calculated, thus have impact on electric power enterprise and reasonable, the just electricity consumption transaction of Electricity customers.
Summary of the invention
The object of the invention is to provide a kind of live replacement of electric energy meter electric quantity compensating optimization method based on least square curve fit, to improve the metering accuracy that in transformation, electric quantity loss compensates under Source of Gateway Meter online mode, conscientiously ensure the economic interests purchasing sale of electricity both sides.
For realizing above technical purpose, this invention takes following technical scheme:
Based on the live replacement of electric energy meter electric quantity compensating optimization method of least square curve fit, comprise the following steps: first, before carrying out changing table handling, by three-phase electric energy meter on-site calibrator device voltage link and be connected to loop, electric current wiring serial connection to loop; When carrying out changing table handling, reliable short circuit is changed electric energy meter secondary current testing terminal, and judges whether reliable short circuit by clamp reometer measurement current value size, starts stopwatch record and changes the table time; Changing when table starts utilizes three-phase electric energy meter on-site calibrator to obtain t
1to t
2the active power discrete point of time period is p (t
n), then utilize least square curve fitting method to draw function p (t) of powertrace according to its discrete point sampled value, finally utilize power and time relationship to measure to change in table process and lose total active energy.
The present invention utilizes the instantaneous power dis-crete sample values of three-phase electric energy meter on-site calibrator measurement device, and record changes required time in table process, by least square fitting powertrace function, finally calculates to change in table process and loses electricity.
Beneficial effect of the present invention and advantage as follows: under the online substitute mode of gate energy meter, load fluctuation is indefinite, generally present unordered discrete point, therefore least square method is suitable for the matching of powertrace, real power curve can be approached, and then guarantee to change the accuracy of losing electric quantity metering in electric energy meter process.
Accompanying drawing explanation
Fig. 1 is the powertrace schematic diagram utilizing least square fitting.
Embodiment
Below in conjunction with the drawings and specific embodiments, the specific embodiment of the present invention is further described.
As shown in Figure 1, the present invention is a kind of live replacement of electric energy meter electric quantity compensating optimization method based on least square curve fit, comprise the following steps: first, before carrying out changing table handling, by three-phase electric energy meter on-site calibrator device voltage link and be connected to loop, electric current wiring serial connection to loop.When carrying out changing table handling, reliable short circuit is changed electric energy meter secondary current testing terminal, and judges whether reliable short circuit by clamp reometer measurement current value size, starts stopwatch record and changes the table time.Changing when table starts utilizes three-phase electric energy meter on-site calibrator to obtain t
1to t
2the active power discrete point of time period is p (t
n), then utilize least square curve fitting method to draw function p (t) of powertrace according to its discrete point sampled value, and then utilize power and time relationship to measure to change in table process and lose total active energy.
The present invention utilizes the instantaneous power dis-crete sample values of three-phase electric energy meter on-site calibrator measurement device, and record changes required time in table process, by least square fitting powertrace function, finally calculates to change in table process and loses electricity.
Respectively each step is described as follows below:
1, in order to further instruction this kind of Optimization Compensation method, table 1 gives one group of discrete power data, wherein lists the power factor (PF) of each time point.
The power data that one group, table 1 is discrete
2, for above-mentioned experimental data, then utilize least square fitting function to go matching instantaneous power data, three-phase electric energy meter tester instantaneous power curve situation can be obtained as shown in Figure 1.
Above-mentioned power matched curve is for changing instantaneous power and time relationship in table process, and electricity is the area that power and time t axle surround, and then can calculate active energy is 11.6318w.And general gate energy meter electric energy is all calculate with kwh, by calculating electricity through being scaled 0.0116kwh.
Be not difficult to find, if it is more to change the number of times recording instantaneous power in table process, powertrace is close to reality, therefore at the scene in record repeatedly instantaneous power as much as possible, if three-phase electric energy meter on-site calibrator has communication function and instantaneous electric quantity writing function, computing machine can be utilized to carry out repeatedly the record of instantaneous value, can computational accuracy be improved.
Claims (2)
1. based on the live replacement of electric energy meter electric quantity compensating optimization method of least square curve fit, it is characterized in that, comprise the following steps: first, before carrying out changing table handling, by three-phase electric energy meter on-site calibrator device voltage link and be connected to loop, electric current wiring serial connection to loop; When carrying out changing table handling, reliable short circuit is changed electric energy meter secondary current testing terminal, and judges whether reliable short circuit by clamp reometer measurement current value size, starts stopwatch record and changes the table time; Changing when table starts utilizes three-phase electric energy meter on-site calibrator to obtain t
1to t
2the active power discrete point of time period is p (t
n), then utilize least square curve fitting method to draw function p (t) of powertrace according to its discrete point sampled value, finally utilize power and time relationship to measure to change in table process and lose total active energy.
2. the live replacement of electric energy meter electric quantity compensating optimization method based on least square curve fit according to claim 1, it is characterized in that, utilize the instantaneous power dis-crete sample values of three-phase electric energy meter on-site calibrator measurement device, record changes required time in table process, by least square fitting powertrace function, finally calculate to change in table process and lose electricity.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510353832.6A CN105044451B (en) | 2015-06-24 | 2015-06-24 | Live replacement of electric energy meter electric quantity compensating optimization method based on least square curve fit |
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| CN201510353832.6A CN105044451B (en) | 2015-06-24 | 2015-06-24 | Live replacement of electric energy meter electric quantity compensating optimization method based on least square curve fit |
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| CN105044451A true CN105044451A (en) | 2015-11-11 |
| CN105044451B CN105044451B (en) | 2017-12-12 |
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| CN105610154A (en) * | 2016-01-18 | 2016-05-25 | 云南电网有限责任公司电力科学研究院 | Electric quantity compensation processing method and device for electric energy meter during on-line replacement |
| CN110542772A (en) * | 2019-09-06 | 2019-12-06 | 国网黑龙江省电力有限公司鹤岗供电公司 | Nondestructive replacement device and method for electric energy meter |
| CN112133029A (en) * | 2020-09-15 | 2020-12-25 | 赵敏 | Real-time electric quantity charging settlement method for electric energy meter replacement |
| CN112505613A (en) * | 2020-10-29 | 2021-03-16 | 国网山东省电力公司济宁供电公司 | High-power-supply high-metering full-voltage-loss metering fault loss electric quantity estimation method and system |
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Cited By (4)
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| CN105610154A (en) * | 2016-01-18 | 2016-05-25 | 云南电网有限责任公司电力科学研究院 | Electric quantity compensation processing method and device for electric energy meter during on-line replacement |
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| CN112133029A (en) * | 2020-09-15 | 2020-12-25 | 赵敏 | Real-time electric quantity charging settlement method for electric energy meter replacement |
| CN112505613A (en) * | 2020-10-29 | 2021-03-16 | 国网山东省电力公司济宁供电公司 | High-power-supply high-metering full-voltage-loss metering fault loss electric quantity estimation method and system |
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| CN105044451B (en) | 2017-12-12 |
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