CN102798837A - Phase error correcting circuit and method of power frequency signal vector measuring equipment - Google Patents
Phase error correcting circuit and method of power frequency signal vector measuring equipment Download PDFInfo
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- CN102798837A CN102798837A CN2012102895106A CN201210289510A CN102798837A CN 102798837 A CN102798837 A CN 102798837A CN 2012102895106 A CN2012102895106 A CN 2012102895106A CN 201210289510 A CN201210289510 A CN 201210289510A CN 102798837 A CN102798837 A CN 102798837A
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Abstract
The invention relates to a phase error correcting circuit of power frequency signal vector measuring equipment. The phase error correcting circuit comprises a mutual inductor input channel, a correction input channel, a zero-crossing detecting circuit, a digital quantity input circuit, a high speed ADC (analog to digital converter) unit and a master control unit and so on. The invention further provides a method applying the circuit. The method comprises the following steps: when the correcting operation is performed, the mutual inductor input channel is connected with the correction input channel in parallel and accessed to a standard signal source; different standard signal input amplitude is standardized through the digital quantity input state; the phase of the mutual inductor input channel and the phase of the correcting channel are compared; the induced error of the mutual inductor is computed; and the error data table is formed and stored in a nonvolatile memory. The phase error correcting circuit and the method have the advantages that the phase measuring precision can be greatly improved; the input power frequency signal can be kept within 10%-120% of rated amplitude; the phase measuring maximum error is up to 0.5 degrees less; the requirement of the equipment for the mutual inductor is reduced, which is beneficial for reducing the product cost; and the circuit is low in cost, convenient to operate and practical.
Description
Technical field
The present invention relates to a kind of being used for carries out the circuit of phase error correction and adopts the phase error correction method of this circuit power frequency component vector measurement device.
Background technology
In power industry, traditional ammeter test data is information such as amplitude, power, frequency, electric energy metrical.Along with the development of intelligent grid, increasing being applied in the electric system of power frequency vector measurement device.This vector measurement device not only can be measured information such as the amplitude, power, frequency of electric power signal, the phase information of going back the energy measurement electric power signal.
In the middle of ammeter and power frequency vector measurement device, signal input circuit all adopts micro mutual inductor to carry out signal transformation and isolation.Because power frequency component can be introduced phase shift through behind the micro mutual inductor, and this phase shift is along with the amplitude nonlinearities change of input power frequency component.Therefore something must be done among power frequency vector measurement device, proofreaies and correct the phase measurement error that causes owing to phase shift, to obtain higher measuring accuracy.
Existing corrective action has following several kinds.For example application number is that 200920033579.6 utility model patent has used standard mutual inductor as proofreading and correct the contrast passage, but the method for using this patent and providing can't realize the correction of the error information of a plurality of amplitude points.Application number is that 200910065392.9 patent has used the mode of pure hardware circuit that transformer error is compensated; It is when measuring-signal magnitude scope is very big that this patent provides the shortcoming of method; Compensation effect is bad; And to each micro mutual inductor one group of corresponding hardware compensating circuit must be arranged, cost is higher.
Summary of the invention
An object of the present invention is to provide a kind of correction range wide ranges, compensation effect is good, and the low phase error correction circuit of cost.Another object of the present invention has provided a kind of phase error correction method that adopts this circuit.
In order to achieve the above object; A technical scheme of the present invention has provided a kind of power frequency component vector measurement device phase error correction circuit; It is characterized in that: comprise digital quantity input block, mutual inductor input channel and proofread and correct input channel, the digital quantity input block connects main control unit, by demarcating different standard signal input amplitudes through changing the digital quantity input state to main control unit; And through digital quantity input block change duty; The output terminal of mutual inductor input channel and correction input channel connects the high-speed ADC unit, and the high-speed ADC unit connects main control unit, is connected with zero cross detection circuit between the output terminal of mutual inductor input channel and the main control unit; When being in the correct operation state, the input end parallel connection of mutual inductor input channel and correction input channel inserts standard signal source.
Preferably, said digital quantity input block comprises the switch key unit, and the switch key unit connects optical coupling isolation circuit, and optical coupling isolation circuit connects said main control unit.
Preferably; Said mutual inductor input channel comprises micro mutual inductor; The primary coil of micro mutual inductor connects bleeder circuit, and its secondary coil connects signal amplification circuit, and the output terminal of signal amplification circuit connects said zero cross detection circuit and said high-speed ADC unit respectively.
Preferably, said bleeder circuit is a resistor voltage divider circuit.
Preferably, said correction input channel is a resistor voltage divider circuit.
Another technical scheme of the present invention has provided a kind of phase error correction method that adopts above-mentioned power frequency component vector measurement device phase error correction circuit, it is characterized in that step is:
The first step, entire equipment is set in the correct operation state, subsequently, inserts standard signal source in the mutual inductor input channel and the input end parallel connection of proofreading and correct input channel through the digital quantity input block;
Second goes on foot, passes through to change the digital quantity input state demarcates a standard signal input amplitude to main control unit, passes through standard signal source again and imports and the corresponding power supply signal of this standard signal input amplitude;
The 3rd goes on foot, is measured respectively by main control unit mutual inductor passage output signal and the correction channel output signal of exporting via mutual inductor input channel and correction input channel; Through comparing the phase place of mutual inductor passage output signal and correction channel output signal; Calculate with the corresponding mutual inductor of current standard signal input amplitude and introduce error, and current standard signal input amplitude and corresponding mutual inductor introducing error thereof are stored;
The 4th step, change standard signal input amplitude repeat second step and the 3rd step, import amplitude until testing all the different standard signals that need test;
The 5th the step, through the digital quantity input block entire equipment is set in normal operating conditions; Mutual inductor input channel cut-in operation signal source; The amplitude in main control unit and working signal source is different; The data Interpolation Method of passing through the first step to the four steps acquisition according to being stored in wherein calculates transformer error, and then the phase value of being exported signal by the mutual inductor passage of mutual inductor input channel acquisition is compensated.
Preferably; When carrying out for the 3rd step; Produce a rising edge by zero cross detection circuit at the positive going zeror crossing point of said mutual inductor passage output signal; After said main control unit was caught this rising edge, the measurement that begins to start said mutual inductor passage output signal and said correction channel output signal was calculated.
The present invention contrasts prior art has following beneficial effect: 1, significantly improve phase measurement accuracy, can make the input power frequency component in specified amplitude 10%～120% scope, the phase measurement maximum error reaches below 0.5 °; 2, reduced the requirement of equipment to mutual inductor, useful to reducing cost of products; 3, cost is low, easy to operate, practical.
Description of drawings
Fig. 1 is the circuit block diagram of a kind of power frequency component vector measurement device phase error correction circuit provided by the invention.
Embodiment
For making the present invention more obviously understandable, now with preferred embodiment, and conjunction with figs. elaborates as follows.
As shown in Figure 1; The invention provides a kind of power frequency component vector measurement device phase error correction circuit; Comprise digital quantity input block, mutual inductor input channel 1 and proofread and correct input channel 2, the digital quantity input block connects main control unit, demarcates different standard signal input amplitudes by become the digital quantity input state through this to main control unit; And through digital quantity input block change duty; The output terminal of mutual inductor input channel 1 and correction input channel 2 connects the high-speed ADC unit, and the high-speed ADC unit connects main control unit, is connected with zero cross detection circuit between the output terminal of mutual inductor input channel 1 and the main control unit; When being in the correct operation state, the input end parallel connection of mutual inductor input channel 1 and correction input channel 2 inserts standard signal source.
Wherein, the digital quantity input block comprises switch key unit 3, and switch key unit 3 connects optical coupling isolation circuit, and optical coupling isolation circuit connects main control unit.
Mutual inductor input channel 1 comprises micro mutual inductor T1, and the primary coil of micro mutual inductor T1 connects bleeder circuit, and its secondary coil connects signal amplification circuit, and the output terminal of signal amplification circuit connects said zero cross detection circuit and said high-speed ADC unit respectively.Bleeder circuit is the resistor voltage divider circuit of being made up of resistance R 3 and resistance R 4.Signal amplification circuit comprises operational amplifier and is connected across the input end and the resistance R between the output terminal 5 of operational amplifier.
Proofreading and correct input channel 2 is the resistor voltage divider circuit of being made up of resistance R 1 and resistance R 2.
The present invention also provides a kind of phase error correction method that adopts above-mentioned power frequency component vector measurement device phase error correction circuit, the steps include:
The first step, whole amplitude range equidistantly is divided into some points, each o'clock is as a check point;
Second goes on foot, passes through the switch key unit 3 selection mode of operations of digital quantity input block, thereby entire equipment is set in the correct operation state, subsequently, and at the input end parallel connection access standard signal source of mutual inductor input channel 1 and correction input channel 2;
Thereby a standard signal input amplitude is demarcated to main control unit in the 3rd step, the switch key unit 3 through operand word amount input block, again through standard signal source input and the corresponding power supply signal of this standard signal input amplitude;
The 4th goes on foot, is measured respectively by main control unit mutual inductor passage output signal and the correction channel output signal of being exported via mutual inductor input channel 1 and correction input channel 2.Produce a rising edge by zero cross detection circuit at the positive going zeror crossing point of mutual inductor passage output signal, after main control unit was caught this rising edge, the phase measurement that begins to start mutual inductor passage output signal and correction channel output signal was calculated.Through comparing the phase place of mutual inductor passage output signal and correction channel output signal; Calculate and the corresponding mutual inductor of current standard signal input amplitude is introduced error, and with current standard signal input amplitude and corresponding mutual inductor thereof introduce error as one group of data storage in amplitude-error information table in the nonvolatile memory of main control unit;
The 5th step, change standard signal input amplitude repeated for second step to the 4th step, until testing all check points;
The 6th the step, through the digital quantity input block entire equipment is set in normal operating conditions; Mutual inductor input channel 1 cut-in operation signal source; The amplitude in main control unit and working signal source is different; Data Interpolation Method according in amplitude-error information table calculates transformer error, and then the phase value of being exported signal by the mutual inductor passage of mutual inductor input channel 1 acquisition is compensated.
Claims (7)
1. power frequency component vector measurement device phase error correction circuit; It is characterized in that: comprise digital quantity input block, mutual inductor input channel (1) and proofread and correct input channel (2); The digital quantity input block connects main control unit; Import amplitude by demarcating different standard signals through this change digital quantity input state to main control unit, and change duty through the digital quantity input block, the output terminal of mutual inductor input channel (1) and correction input channel (2) connects the high-speed ADC unit; The high-speed ADC unit connects main control unit; Be connected with zero cross detection circuit between the output terminal of mutual inductor input channel (1) and the main control unit, when being in the correct operation state, the input end parallel connection of mutual inductor input channel (1) and correction input channel (2) inserts standard signal source.
2. a kind of power frequency component vector measurement device phase error correction circuit as claimed in claim 1; It is characterized in that: said digital quantity input block comprises switch key unit (3); Switch key unit (3) connects optical coupling isolation circuit, and optical coupling isolation circuit connects said main control unit.
3. a kind of power frequency component vector measurement device phase error correction circuit as claimed in claim 1; It is characterized in that: said mutual inductor input channel (1) comprises micro mutual inductor (T1); The primary coil of micro mutual inductor (T1) connects bleeder circuit; Its secondary coil connects signal amplification circuit, and the output terminal of signal amplification circuit connects said zero cross detection circuit and said high-speed ADC unit respectively.
4. a kind of power frequency component vector measurement device phase error correction circuit as claimed in claim 3, it is characterized in that: said bleeder circuit is a resistor voltage divider circuit.
5. a kind of power frequency component vector measurement device phase error correction circuit as claimed in claim 1 is characterized in that: said correction input channel (2) is a resistor voltage divider circuit.
6. phase error correction method that adopts power frequency component vector measurement device phase error correction circuit as claimed in claim 1 is characterized in that step is:
The first step, entire equipment is set in the correct operation state, subsequently, inserts standard signal source in the mutual inductor input channel (1) and the input end parallel connection of proofreading and correct input channel (2) through the digital quantity input block;
Second goes on foot, passes through to change digital quantity input block state demarcates a standard signal input amplitude to main control unit, passes through standard signal source again and imports and the corresponding power supply signal of this standard signal input amplitude;
The 3rd goes on foot, is caught respectively by main control unit mutual inductor passage output signal and the correction channel output signal of being exported via mutual inductor input channel (1) and correction input channel (2); Through comparing the phase place of mutual inductor passage output signal and correction channel output signal; Calculate with the corresponding mutual inductor of current standard signal input amplitude and introduce error, and current standard signal input amplitude and corresponding mutual inductor introducing error thereof are stored;
The 4th step, change standard signal input amplitude repeat second step and the 3rd step, import amplitude until testing all the different standard signals that need test;
The 5th the step, through the digital quantity input block entire equipment is set in normal operating conditions; Mutual inductor input channel (1) cut-in operation signal source; The amplitude in main control unit and working signal source is different; The data Interpolation Method of passing through the first step to the four steps acquisition according to being stored in wherein calculates transformer error, and then the phase value of being exported signal by the mutual inductor passage of mutual inductor input channel (1) acquisition is compensated.
7. a kind of phase error correction method as claimed in claim 6; It is characterized in that; When carrying out for the 3rd step; Produce a rising edge by zero cross detection circuit at the positive going zeror crossing point of said mutual inductor passage output signal, after said main control unit was caught this rising edge, the phase measurement that begins to start said mutual inductor passage output signal and said correction channel output signal was calculated.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012102895106A CN102798837A (en) | 2012-08-14 | 2012-08-14 | Phase error correcting circuit and method of power frequency signal vector measuring equipment |
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| CN2012102895106A CN102798837A (en) | 2012-08-14 | 2012-08-14 | Phase error correcting circuit and method of power frequency signal vector measuring equipment |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105158720A (en) * | 2015-10-22 | 2015-12-16 | 上海市计量测试技术研究院 | Method for calibrating 90-degree phase angle relative error |
| US9733870B2 (en) | 2015-05-06 | 2017-08-15 | International Business Machines Corporation | Error vector readout from a memory device |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10148648A (en) * | 1996-11-20 | 1998-06-02 | Yokogawa Electric Corp | Electric meter |
| US7359809B2 (en) * | 2004-09-28 | 2008-04-15 | Veris Industries, Llc | Electricity metering with a current transformer |
| CN201438211U (en) * | 2009-06-17 | 2010-04-14 | 西安华伟光电技术有限公司 | Electronic transformer calibrator |
| CN101770005A (en) * | 2010-01-22 | 2010-07-07 | 云南电力试验研究院(集团)有限公司 | DC electronic transformer calibration device and method |
| CN201757779U (en) * | 2010-05-28 | 2011-03-09 | 深圳市科陆电子科技股份有限公司 | Electronic transformer calibrator |
-
2012
- 2012-08-14 CN CN2012102895106A patent/CN102798837A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10148648A (en) * | 1996-11-20 | 1998-06-02 | Yokogawa Electric Corp | Electric meter |
| US7359809B2 (en) * | 2004-09-28 | 2008-04-15 | Veris Industries, Llc | Electricity metering with a current transformer |
| CN201438211U (en) * | 2009-06-17 | 2010-04-14 | 西安华伟光电技术有限公司 | Electronic transformer calibrator |
| CN101770005A (en) * | 2010-01-22 | 2010-07-07 | 云南电力试验研究院(集团)有限公司 | DC electronic transformer calibration device and method |
| CN201757779U (en) * | 2010-05-28 | 2011-03-09 | 深圳市科陆电子科技股份有限公司 | Electronic transformer calibrator |
Non-Patent Citations (1)
| Title |
|---|
| 梅志刚等: "一种虚拟互感器校验仪的设计", 《变压器》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9733870B2 (en) | 2015-05-06 | 2017-08-15 | International Business Machines Corporation | Error vector readout from a memory device |
| CN105158720A (en) * | 2015-10-22 | 2015-12-16 | 上海市计量测试技术研究院 | Method for calibrating 90-degree phase angle relative error |
| CN105158720B (en) * | 2015-10-22 | 2018-05-04 | 上海市计量测试技术研究院 | A kind of method for calibrating 90 degree of phase angle relative errors |
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Application publication date: 20121128 |