CN202075344U - Electric energy meter and electric energy correction system - Google Patents
Electric energy meter and electric energy correction system Download PDFInfo
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- CN202075344U CN202075344U CN2011201193639U CN201120119363U CN202075344U CN 202075344 U CN202075344 U CN 202075344U CN 2011201193639 U CN2011201193639 U CN 2011201193639U CN 201120119363 U CN201120119363 U CN 201120119363U CN 202075344 U CN202075344 U CN 202075344U
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Abstract
The utility model provides an electric energy meter and an electric energy correction system, which are suitable for the electric power field. The electric energy meter comprises an analog-to-digital converter, a digital filter, a phase error corrector, a power gain corrector and a power integral and effective value calculator; the electric energy meter also comprises a self-correction circuit connected with a voltage effective value output end and a current effective value output end of the electric energy meter and capable of correcting the current effective value, the voltage effective value and the active power; an input end of the self-correction circuit is connected with an active power output end, and an output end of the self-correction circuit is used for outputting the correction value. The electric energy meter and the electric energy correction system provided by the utility model have the advantage of self-correction.
Description
Technical field
The utility model belongs to power domain, relates in particular to a kind of electric energy meter and electric energy corrective system.
Background technology
Electric energy meter must be proofreaied and correct active energy precision or reactive energy precision in process of production, and the error that needs to proofread and correct comprises gain error and phase error.At present general corrective system theory diagram is shown in Fig. 1 (is example with the single-phase electric energy meter): comprising: standard source 101, main control computer 102, electric energy meter 103 and standard unit 104;
Wherein standard source 101: the alternating voltage current signal of outputting standard, as the standard signal source of electric energy meter corrective system;
Main control computer 102:, be in charge of the data transmission between standard source, electric energy meter, the standard unit as the master control of whole corrective system; At the timing main control computer following effect is arranged: read the electric energy error that standard unit provides; According to electric energy error corrected value is write electric energy meter, finish the correction of electric energy meter; Standard source is controlled the amplitude and the phase place of the output of control criterion source signal;
Electric energy meter 103: as the object that is corrected, mainly refer to single-phase electric energy meter, the structural drawing of this electric energy meter as shown in Figure 2;
Standard unit 104: as the standard unit of corrective system, establishing criteria source input signal and electric energy meter are exported pulse, provide the measuring error of electric energy meter 103.
As Fig. 2: shown in: electric energy meter comprises: analog to digital converter ADC201, digital filter 202, phase error correction 203, power gain proofread and correct 204, power integration 205 and effective value calculate 206; Wherein:
ADC201: finish the analog-digital conversion of voltage and current signal;
Digital filter 202: the digital signal after the analog to digital conversion is carried out filtering, and filtering direct current, low frequency, high fdrequency component keep first-harmonic and harmonic component.
Phase error correction 203: the phase error to the voltage and current passage is proofreaied and correct, by realization that sampled data is delayed time, and can be before digital filter or afterwards, the purpose of correction is to reduce phase error between voltage and the electric current;
Power gain proofreaies and correct 204: active power and reactive power are carried out gain calibration respectively, revise the initial gain error of electric energy meter;
Power integration 205: active power and reactive power after proofreading and correct are carried out integration, obtain electric energy, and with the pulsed frequency output of electric energy conversion for being directly proportional with it;
Effective value calculates 206: finish the calculating of voltage and current effective value, as the parameter of three-phase electric energy meter.
Existing electric energy meter structure makes system carrying out timing, need be proofreaied and correct by standard unit, and existing electric energy meter can't carry out self-correcting.
The utility model content
The purpose of this utility model is to provide a kind of electric energy meter, is intended to solve that electric energy meter can't self-tuning problem in the prior art.
The utility model is achieved in that a kind of electric energy meter, and this electric energy meter comprises: analog to digital converter, digital filter, phase error correction, power gain correction, power integration and effective value calculate; Described electric energy meter also comprises:
The self-correcting circuit that is connected with the current effective value output terminal with this electric energy meter voltage effective value output terminal with correcting current effective value, voltage effective value and active power; The input end of this self-correcting circuit also is connected with the active power output terminal, the output terminal output calibration value of this self-correcting circuit.
Optionally, described self-correcting circuit comprises:
First comparer; One input end of this first comparer is connected with initial active power P1; Another input end is connected with theoretical active power P0, this output terminal output difference;
Second comparer; One input end of this second comparer is connected with theoretical applied power S0, and another input end is connected with the output terminal of multiplier, and two input ends of this multiplier are connected with current effective value respectively at voltage effective value, the output terminal output difference of this second comparer;
What be connected with the output terminal of this first comparer and this second comparer has the computing module that rated output gain error and phase error obtain the corrected value of two errors, an output terminal output calibration value of this computing module.
The utility model also provides a kind of electric energy corrective system, and this system comprises: main control computer, and described system also comprises:
The standard source that is connected and has a POL of output with this main control computer; Above-mentioned electric energy meter;
The output terminal of this standard source is connected with this electric energy meter.
The utility model compared with prior art, beneficial effect is: because the electric energy meter in the technical solution of the utility model has self-correcting function, so have can self-tuning advantage for it.
Description of drawings
The structural drawing of the corrective system that Fig. 1 provides for prior art;
The structural drawing of the electric energy meter that Fig. 2 provides for prior art;
The structural drawing of the electric energy meter that Fig. 3 provides for the utility model;
The self-correcting circuit structure diagram that Fig. 4 provides for the utility model;
The electric energy corrective system structural drawing that Fig. 5 provides for the utility model.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearer,, the utility model is further elaborated below in conjunction with drawings and Examples.Should be appreciated that specific embodiment described herein only in order to explanation the utility model, and be not used in qualification the utility model.
The utility model provides a kind of electric energy meter, and the structure of this electric energy meter comprises as shown in Figure 3: analog to digital converter ADC201, digital filter 202, phase error correction 203, power gain correction 204, power integration 205 and effective value calculate 206; In addition, this electric energy meter also comprises the self-correcting circuit 307 with correcting current effective value, voltage effective value and active power that is connected with the current effective value output terminal with this electric energy meter voltage effective value output terminal; Wherein the input end of self-correcting circuit 307 also is connected with the active power output terminal, the output terminal output calibration value of this self-correcting circuit 307.
Need to prove that the structure of above-mentioned self-correcting circuit 307 specifically can comprise as shown in Figure 4:
First comparer 3071; One input end of this first comparer is connected with initial active power P1; Another input end is connected with theoretical active power P0, this output terminal output difference, and this first comparer is specifically as follows subtracter;
Need to prove that above-mentioned theory applied power S0 can be a constant that is provided with, this theory active power P0 also can be a constant that is provided with.
The principle of the error of calculation is described with a real example below.Suppose that voltage and current signal that ADC receives can be rated current 5A, rated voltage 220V, 60 degree phase places; Li Lun active power P0=220V*5A*cos (60 degree)=550W then; Theoretical applied power S0=220V*5A=1100W;
The initial active power that metering circuit in the electric energy meter calculates is P1; Initial applied power S1=voltage effective value * current effective value has and can be calculated by multiplier;
The power gain error can be calculated by second comparer by the difference of S1 and S0 so;
Phase error can be obtained by the difference of first comparer calculating P1 and P0;
The automatic error of calculation of the computing module of self-correcting circuit is proofreaied and correct the power gain that calculates and the phase error correction value is inserted register automatically, finishes correction.
Need to prove that above-mentioned electric energy meter can be single-phase electric energy meter, also can be three-phase electric energy meter, for example three-phase and four-line electric energy meter.
Because the electric energy meter that the utility model provides has the self-correcting circuit, so this electric energy meter can be from normal moveout correction.
The utility model also provides a kind of electric energy corrective system, and this system comprises as shown in Figure 5: main control computer 502, standard source 501 and above-mentioned electric energy meter 503;
Wherein, main control computer 502 is connected with standard source 501, and standard source 501 can be for having the standard source 501 of POL of output (such as rated current 5A, rated voltage 220V, requirement is capacitive or inductive load, such as 60 degree phase places);
The structure of above-mentioned electric energy meter 503 is not being given unnecessary details here in above-mentioned explanation.
Electric energy meter in the system that the utility model provides can be from normal moveout correction, so this system need not standard unit, so it has cost-effective advantage, in addition, there is this standard source only to export a POL again, so all trimming processes are finished an electric current and voltage input point, can realize single point correction, do not need a plurality of steps of branch just can finish correction, saved correction time greatly, and parameter update such as effective value, power and signal magnitude are irrelevant, so the correction rate of small-signal and large-signal are suitable, can accelerate the small-signal trimming process greatly.
The technical scheme that the utility model provides has self-correcting, saves time, cost-effective advantage.
The above only is preferred embodiment of the present utility model; not in order to restriction the utility model; all any modifications of within spirit of the present utility model and principle, being done, be equal to and replace and improvement etc., all should be included within the protection domain of the present utility model.
Claims (3)
1. electric energy meter, this electric energy meter comprises: analog to digital converter, digital filter, phase error correction, power gain are proofreaied and correct, power integration and effective value calculate; It is characterized in that described electric energy meter also comprises:
The self-correcting circuit that is connected with the current effective value output terminal with this electric energy meter voltage effective value output terminal with correcting current effective value, voltage effective value and active power; The input end of this self-correcting circuit also is connected with the active power output terminal, the output terminal output calibration value of this self-correcting circuit.
2. electric energy meter according to claim 1 is characterized in that, described self-correcting circuit comprises:
First comparer; One input end of this first comparer is connected with initial active power P1; Another input end is connected with theoretical active power P0, this output terminal output difference;
Second comparer; One input end of this second comparer is connected with theoretical applied power S0, and another input end is connected with the output terminal of multiplier, and two input ends of this multiplier are connected with current effective value respectively at voltage effective value, the output terminal output difference of this second comparer;
What be connected with the output terminal of this first comparer and this second comparer has the computing module that rated output gain error and phase error obtain the corrected value of two errors, an output terminal output calibration value of this computing module.
3. electric energy corrective system, this system comprises: main control computer is characterized in that described system also comprises:
The standard source that is connected and has a POL of output with this main control computer;
Electric energy meter as claimed in claim 1 or 2;
The output terminal of this standard source is connected with this electric energy meter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201193639U CN202075344U (en) | 2011-04-21 | 2011-04-21 | Electric energy meter and electric energy correction system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201193639U CN202075344U (en) | 2011-04-21 | 2011-04-21 | Electric energy meter and electric energy correction system |
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| Publication Number | Publication Date |
|---|---|
| CN202075344U true CN202075344U (en) | 2011-12-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2011201193639U Expired - Lifetime CN202075344U (en) | 2011-04-21 | 2011-04-21 | Electric energy meter and electric energy correction system |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102608559A (en) * | 2012-03-19 | 2012-07-25 | 钜泉光电科技(上海)股份有限公司 | Method for collecting electric energy errors of electric energy meter and device thereof |
| CN106569167A (en) * | 2016-10-17 | 2017-04-19 | 中国电力科学研究院 | Electric energy meter error automatic checking method and electric energy meter |
| CN106597355A (en) * | 2016-11-22 | 2017-04-26 | 积成电子股份有限公司 | Table look-up scheme-based electric energy metering device calibration coefficient calculation method |
| CN107607903A (en) * | 2017-09-19 | 2018-01-19 | 珠海格力电器股份有限公司 | Calibration method and device for electric energy metering equipment |
| CN109683122A (en) * | 2019-03-08 | 2019-04-26 | 广东电网有限责任公司 | A kind of three-phase normal power electric energy meter with self calibration diagnostic function |
| CN109683123A (en) * | 2019-03-08 | 2019-04-26 | 广东电网有限责任公司 | A kind of single-phase normal power electric energy meter with self calibration diagnostic function |
-
2011
- 2011-04-21 CN CN2011201193639U patent/CN202075344U/en not_active Expired - Lifetime
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102608559A (en) * | 2012-03-19 | 2012-07-25 | 钜泉光电科技(上海)股份有限公司 | Method for collecting electric energy errors of electric energy meter and device thereof |
| CN102608559B (en) * | 2012-03-19 | 2014-07-30 | 钜泉光电科技(上海)股份有限公司 | Method for collecting electric energy errors of electric energy meter and device thereof |
| CN106569167A (en) * | 2016-10-17 | 2017-04-19 | 中国电力科学研究院 | Electric energy meter error automatic checking method and electric energy meter |
| CN106597355A (en) * | 2016-11-22 | 2017-04-26 | 积成电子股份有限公司 | Table look-up scheme-based electric energy metering device calibration coefficient calculation method |
| CN107607903A (en) * | 2017-09-19 | 2018-01-19 | 珠海格力电器股份有限公司 | Calibration method and device for electric energy metering equipment |
| CN109683122A (en) * | 2019-03-08 | 2019-04-26 | 广东电网有限责任公司 | A kind of three-phase normal power electric energy meter with self calibration diagnostic function |
| CN109683123A (en) * | 2019-03-08 | 2019-04-26 | 广东电网有限责任公司 | A kind of single-phase normal power electric energy meter with self calibration diagnostic function |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: SHENZHEN RUINENG MICRO-TECHNOLOGY CO., LTD. Free format text: FORMER NAME: SHENZHEN RENERGY TECHNOLOGY CO.,LTD. |
|
| CP01 | Change in the name or title of a patent holder |
Address after: 518000 Guangdong city of Shenzhen province Nanshan District South Road No. 97 Huaying building room A201 Patentee after: Shenzhen ruineg micro Polytron Technologies Inc Address before: 518000 Guangdong city of Shenzhen province Nanshan District South Road No. 97 Huaying building room A201 Patentee before: Shenzhen Renergy Technology Co.,Ltd. |
|
| CP03 | Change of name, title or address | ||
| CP03 | Change of name, title or address |
Address after: 518000 Shenzhen, Guangdong, Nanshan District Haitian Road, No. 13 Shenzhen software industry base 5B-401 Patentee after: Shenzhen Renergy Technology Co.,Ltd. Address before: 518000 Guangdong city of Shenzhen province Nanshan District South Road No. 97 Huaying building room A201 Patentee before: Shenzhen ruineg micro Polytron Technologies Inc |
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| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20111214 |