CN101825659B - Electric quantity signal online detecting method - Google Patents
Electric quantity signal online detecting method Download PDFInfo
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- CN101825659B CN101825659B CN201010167221XA CN201010167221A CN101825659B CN 101825659 B CN101825659 B CN 101825659B CN 201010167221X A CN201010167221X A CN 201010167221XA CN 201010167221 A CN201010167221 A CN 201010167221A CN 101825659 B CN101825659 B CN 101825659B
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- 238000000034 method Methods 0.000 title claims abstract description 34
- 230000003321 amplification Effects 0.000 claims description 4
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 4
- 230000010354 integration Effects 0.000 claims description 3
- 238000005070 sampling Methods 0.000 claims description 2
- 238000001514 detection method Methods 0.000 abstract description 5
- 238000005259 measurement Methods 0.000 abstract 1
- 238000006467 substitution reaction Methods 0.000 description 4
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Abstract
The invention discloses an electric quantity signal online detecting method. A first operational amplifier A1, a second operational amplifier A2, a third operational amplifier A3, a fourth operational amplifier A4, eight input resistors Ri, eight feedback resistors Rf and a CPU are provided. The electric quantity signal online detecting method comprises a voltage operating and amplifying step, a current operating and amplifying step, a voltage signal calculating step, a current signal calculating step and an electric quantity signal calculating step. The method is used for electric quantity signal online detection of a smart grid and an intelligent building, can automatically eliminate measurement error caused by wiring, null drift, temperature drift and a common mode interference signal, and has the characteristics of high precision and low cost.
Description
Technical field
The present invention relates to a kind of electric quantity signal online detecting method, relate in particular to the electric quantity signal online detecting method that is used for intelligent grid and intelligent building.
Technical background
The online detection of electric quantity signal is the means of intelligent grid and intelligent building VS .NET Prerequisites.Be used for online detection and monitoring to the quality of power supply.Because on-the-spot load variations is bigger, and exists the measuring error that wiring, drift, temperature are floated and common mode interference signal causes, therefore, eliminate this type of error as far as possible to the having relatively high expectations of the online detection of electric quantity signal.
Common electric quantity signal detects, and can't eliminate above-mentioned error fully, exists like this that efficient is low, the shortcoming of low precision.
Summary of the invention
The objective of the invention is to eliminate on-the-spot load variations and wiring, drift, temperature is floated and common mode interference signal causes measuring error; A kind of electric quantity signal online detecting method that is used for intelligent grid and intelligent building is provided, and it has the advantage that error is little, precision is high, cost is low.
The technical scheme that realizes above-mentioned purpose is: a kind of electric quantity signal online detecting method wherein, comprises the steps:
The voltage operational amplification procedure is through one first operational amplifier A
1With one second operational amplifier A
2Receive the signal of voltage signal to be detected respectively, the output signal is respectively Vo1 and Vo2, this first operational amplifier A
1Normal phase input end link to each other with the anodal V+ of voltage signal to be detected, inverting input links to each other second operational amplifier A with the negative pole V-of voltage signal to be detected
2Normal phase input end link to each other with the negative pole V-of voltage signal to be detected, inverting input links to each other with the anodal V+ of voltage signal to be detected, calculates two outputs signal Vo1 and Vo2:
Vo1=(V+-V-) * Rf/Ri, formula 1;
Vo2=-(V+-V-) * Rf/Ri, formula 2;
Wherein, Rf is a feedback resistance, and Ri is an input resistance;
The current operator amplification procedure is through one the 3rd operational amplifier A
3With a four-operational amplifier A
4Receive the signal of sensed current signal respectively, the output signal is respectively Vo3 and Vo4, the 3rd operational amplifier A
3Normal phase input end link to each other with the anodal I+ of sensed current signal, inverting input links to each other four-operational amplifier A with the negative pole I-of sensed current signal
4Normal phase input end link to each other with the negative pole I-of sensed current signal, inverting input links to each other with the anodal I+ of sensed current signal, calculates two outputs signal Vo3 and Vo4:
Vo3=(I+-I-) * Rf/Ri, formula 3;
Vo4=-(I+-I-) * Rf/Ri, formula 4;
The voltage signal calculation procedure; It is identical to obtain two enlargement factors respectively by said formula 1 and formula 2; In the opposite direction; The signal of the difference of direct ratio and voltage signal both positive and negative polarity to be detected, first operational amplifier A 1 is the operational amplifiers that are positioned at two identical parameters of same integrated circuit with described second operational amplifier A 2, it is Vw that drift, the temperature that operational amplifier produces floated signal.Then formula 1 converts following formula 5 and formula 6 to formula 2:
Vo1+Vw=(V+-V-) * Rf/Ri, formula 5
Vo2+Vw=-(V+-V-) * Rf/Ri, formula 6
The current signal calculation procedure; It is identical to obtain two enlargement factors respectively by said formula 3 and formula 4; In the opposite direction, the signal of the difference of direct ratio and sensed current signal both positive and negative polarity, the 3rd operational amplifier A 3 and four-operational amplifier A4 are the operational amplifiers that is positioned at two identical parameters of same integrated circuit; It is Iw that drift, the temperature that operational amplifier produces floated signal, and then formula 3 converts following formula 7 and formula 8 to formula 4
Vo3+Iw=(I+-I-) * Rf/Ri, formula 7;
Vo4+Iw=-(I+-I-) * Rf/Ri, formula 8;
The electric quantity signal calculation procedure is subtracted each other the result of formula 5 and formula 6, obtains following formula as a result 9:
Voltage signal Vn=2 (V+-V-) * Rf/Ri, formula 9;
The result of formula 7 and formula 8 is subtracted each other, obtains following formula as a result 10:
Current signal In=2 (I+-I-) * Rf/Ri, formula 10;
Through a CPU, utilize the integration convolutional calculation can obtain electric quantity signal shown in formula 11:
Pn=∫ Vn * In, formula 11.
Above-mentioned electric quantity signal online detecting method, wherein, described first to fourth operational amplifier A
1To A
4Normal phase input end and reverse input end all be in series with an input resistance Ri; All be in series with feedback resistance Rf between repercussion input end and the output terminal; All be in series with feedback resistance Rf between normal phase input end and the ground wire datum, the input end of these four operational amplifiers all links to each other with the input end of a CPU.
Above-mentioned electric quantity signal online detecting method, wherein, the resistance of described four input resistance Ri equates that the resistance of described eight feedback resistance Rf equates.
Above-mentioned electric quantity signal online detecting method, wherein, described first operational amplifier A
1, described second operational amplifier A
2, the 3rd operational amplifier A
3, four-operational amplifier A
4It is the operational amplifier that is positioned at four identical parameters of same integrated circuit.
Above-mentioned electric quantity signal online detecting method, wherein, described CPU is the CPU with A/D sampling and computing function.
The invention has the beneficial effects as follows: the present invention is used for the online detection of electric quantity signal of intelligent grid and intelligent building, can eliminate on-the-spot load variations and wiring, drift, temperature is floated and common mode interference signal causes measuring error automatically, and precision is high, cost is low.
Description of drawings
Fig. 1 is the enforcement structural representation of electric quantity signal online detecting method of the present invention.
Embodiment
To combine accompanying drawing that the present invention is described further below.
See also Fig. 1, a kind of practical implementation synoptic diagram that is used for a kind of electric quantity signal online detecting method of intelligent grid and intelligent building has been shown among the figure, it comprises first operational amplifier A
1, second operational amplifier A
2, the 3rd operational amplifier A
3, four-operational amplifier A
4, eight input resistance Ri, eight feedback resistance Rf, a CPU.Wherein:
First operational amplifier A
1The anodal V+ of normal phase input end and voltage signal to be detected between be in series with input resistance Ri, be in series with input resistance Ri between the negative pole V-of inverting input and voltage signal to be detected; Be in series with feedback resistance Rf between normal phase input end and the ground wire datum, inverting input and amplifier A
1Output Vo1 between be in series with feedback resistance Rf;
The resistance of input resistance Ri is equal fully;
The resistance of feedback resistance Rf is equal fully;
First operational amplifier A
1Output Vo1 represent as follows with formula 1:
Vo1=(V+-V-) * Rf/Ri, formula 1
Second operational amplifier A
2The negative pole V-of normal phase input end and voltage signal to be detected between be in series with input resistance Ri, be in series with input resistance Ri between the anodal V+ of inverting input and voltage signal to be detected; Be in series with feedback resistance Rf between normal phase input end and the ground wire datum, inverting input and amplifier A
1Output Vo2 between be in series with feedback resistance Rf;
The resistance of input resistance Ri is equal fully;
The resistance of feedback resistance Rf is equal fully;
Second operational amplifier A
2Output Vo2 represent as follows with formula 2:
Vo2=-(V+-V-) * Rf/Ri, formula 2
The 3rd operational amplifier A
3The anodal I+ of normal phase input end and sensed current signal between be in series with input resistance Ri, be in series with input resistance Ri between the negative pole I-of inverting input and sensed current signal; Be in series with feedback resistance Rf between normal phase input end and the ground wire datum, inverting input and amplifier A
1Output Vo3 between be in series with feedback resistance Rf;
The resistance of input resistance Ri is equal fully;
The resistance of feedback resistance Rf is equal fully;
The 3rd operational amplifier A
3Output Vo3 represent as follows with formula 3:
Vo3=(I+-I-) * Rf/Ri, formula 3
Four-operational amplifier A
4The negative pole I-of normal phase input end and sensed current signal between be in series with input resistance Ri, be in series with input resistance Ri between the anodal I+ of inverting input and sensed current signal; Be in series with feedback resistance Rf between normal phase input end and the ground wire datum, inverting input and amplifier A
1Output Vo4 between be in series with feedback resistance Rf;
The resistance of input resistance Ri is equal fully;
The resistance of feedback resistance Rf is equal fully;
Four-operational amplifier A
4Output Vo4 represent as follows with formula 4:
Vo4=-(I+-I-) * Rf/Ri, formula 4
It is identical, in the opposite direction to obtain two enlargement factors respectively by formula 1 and formula 2, the signal of the difference of direct ratio and voltage signal both positive and negative polarity to be detected.Field wiring of carrying secretly in the signal to be detected and common mode interference signal are in-phase signal Vr; In formula 1 and formula 2, V+ uses the Vr+V+ substitution, and V-uses the Vr+V-substitution; Signal input reality is (V+-V-) still, has eliminated field wiring and the common mode interference signal carried secretly in the signal to be detected.
First operational amplifier A
1With described second operational amplifier A
2It is the operational amplifier that is positioned at two identical parameters of same integrated circuit.It is Vw that drift, the temperature that operational amplifier produces floated signal.Then formula 1 converts following formula 5 and formula 6 to formula 2
Vo1+Vw=(V+-V-) * Rf/Ri, formula 5
Vo2+Vw=-(V+-V-) * Rf/Ri, formula 6
It is identical, in the opposite direction to obtain two enlargement factors respectively by formula 3 and formula 4, the signal of the difference of direct ratio and sensed current signal both positive and negative polarity.Field wiring of carrying secretly in the signal to be detected and common mode interference signal are in-phase signal Ir; In formula 3 and formula 4, I+ uses the Ir+I+ substitution, and I-uses the Ir+I-substitution; Signal input reality is (I+-I-) still, has eliminated field wiring and the common mode interference signal carried secretly in the signal to be detected.
The 3rd operational amplifier A
3With four-operational amplifier A
4It is the operational amplifier that is positioned at two identical parameters of same integrated circuit.It is Iw that drift, the temperature that operational amplifier produces floated signal.Then formula 3 converts following formula 7 and formula 8 to formula 4
Vo3+Iw=(I+-I-) * Rf/Ri, formula 7
Vo4+Iw=-(I+-I-) * Rf/Ri, formula 8
In the A/D of CPU sample circuit, the result of formula 5 is that the A/D1 passage of Vo1 process CPU is converted to, and the result of formula 6 is that the A/D2 passage of Vo2 process CPU is converted to, and only need the result of formula 5 and formula 6 be subtracted each other, and obtains following formula as a result 9:
Voltage signal Vn=2 (V+-V-) * Rf/Ri, formula 9
Formula 9 has been eliminated the error that drift, temperature are floated signal fully, and has further improved enlargement factor, has improved precision simultaneously.
In the A/D of CPU sample circuit, the result of formula 7 is that the A/D3 passage of Vo3 process CPU is converted to, and the result of formula 8 is that the A/D4 passage of Vo4 process CPU is converted to, and only need the result of formula 7 and formula 8 be subtracted each other, and obtains following formula as a result 10:
Current signal In=2 (I+-I-) * Rf/Ri, formula 10
Formula 10 has been eliminated the error that drift, temperature are floated signal fully, and has further improved enlargement factor, has improved precision simultaneously.
In CPU, utilize the integration convolutional calculation can obtain electric quantity signal shown in formula 11:
Pn=∫ Vn * In, formula 11
In the present embodiment, first, second, third, fourth amplifier A
1, A
2, A
3, A
4Be LM064, input resistance Ri=10K Ω, feedback resistance Rf=100K.CPU is DSP, model TSM320F2801.
More than combine accompanying drawing embodiment that the present invention is specified, those skilled in the art can make the many variations example to the present invention according to above-mentioned explanation.Thereby some details among the embodiment should not constitute qualification of the present invention, and the scope that the present invention will define with appended claims is as protection scope of the present invention.
Claims (5)
1. an electric quantity signal online detecting method is characterized in that, comprises the steps:
The voltage operational amplification procedure is through one first operational amplifier A
1With one second operational amplifier A
2Receive the signal of voltage signal to be detected respectively, the output signal is respectively Vo1 and Vo2, this first operational amplifier A
1Normal phase input end link to each other with the anodal V+ of voltage signal to be detected, inverting input links to each other second operational amplifier A with the negative pole V-of voltage signal to be detected
2Normal phase input end link to each other with the negative pole V-of voltage signal to be detected, inverting input links to each other with the anodal V+ of voltage signal to be detected, calculates two outputs signal Vo1 and Vo2:
Vo1=(V+-V-) * Rf/Ri, formula 1;
Vo2=-(V+-V-) * Rf/Ri, formula 2;
Wherein, Rf is a feedback resistance, and Ri is an input resistance;
The current operator amplification procedure is through one the 3rd operational amplifier A
3With a four-operational amplifier A
4Receive the signal of sensed current signal respectively, the output signal is respectively Vo3 and Vo4, the 3rd operational amplifier A
3Normal phase input end link to each other with the anodal I+ of sensed current signal, inverting input links to each other four-operational amplifier A with the negative pole I-of sensed current signal
4Normal phase input end link to each other with the negative pole I-of sensed current signal, inverting input links to each other with the anodal I+ of sensed current signal, calculates two outputs signal Vo3 and Vo4:
Vo3=(I+-I-) * Rf/Ri, formula 3;
Vo4=-(I+-I-) * Rf/Ri, formula 4;
The voltage signal calculation procedure; It is identical to obtain two enlargement factors respectively by said formula 1 and formula 2; In the opposite direction; The signal of the difference of direct ratio and voltage signal both positive and negative polarity to be detected, first operational amplifier A 1 is the operational amplifiers that are positioned at two identical parameters of same integrated circuit with described second operational amplifier A 2, it is Vw that drift, the temperature that operational amplifier produces floated signal.Then formula 1 converts following formula 5 and formula 6 to formula 2:
Vo1+Vw=(V+-V-) * Rf/Ri, formula 5
Vo2+Vw=-(V+-V-) * Rf/Ri, formula 6
The current signal calculation procedure; It is identical to obtain two enlargement factors respectively by said formula 3 and formula 4; In the opposite direction, the signal of the difference of direct ratio and sensed current signal both positive and negative polarity, the 3rd operational amplifier A 3 and four-operational amplifier A4 are the operational amplifiers that is positioned at two identical parameters of same integrated circuit; It is Iw that drift, the temperature that operational amplifier produces floated signal, and then formula 3 converts following formula 7 and formula 8 to formula 4
Vo3+Iw=(I+-I-) * Rf/Ri, formula 7;
Vo4+Iw=-(I+-I-) * Rf/Ri, formula 8;
The electric quantity signal calculation procedure is subtracted each other the result of formula 5 and formula 6, obtains following formula as a result 9:
Voltage signal Vn=2 (V+-V-) * Rf/Ri, formula 9;
The result of formula 7 and formula 8 is subtracted each other, obtains following formula as a result 10:
Current signal In=2 (I+-I-) * Rf/Ri, formula 10;
Through a CPU, utilize the integration convolutional calculation can obtain electric quantity signal shown in formula 11:
Pn=∫ Vn * In, formula 11.
2. electric quantity signal online detecting method according to claim 1 is characterized in that, described first to fourth operational amplifier A
1To A
4Normal phase input end and reverse input end all be in series with an input resistance Ri; All be in series with feedback resistance Rf between repercussion input end and the output terminal; All be in series with feedback resistance Rf between normal phase input end and the ground wire datum, the input end of these four operational amplifiers all links to each other with the input end of a CPU.
3. electric quantity signal online detecting method according to claim 2 is characterized in that, the resistance of described four input resistance Ri equates that the resistance of described eight feedback resistance Rf equates.
4. electric quantity signal online detecting method according to claim 1 is characterized in that, described first operational amplifier A
1, described second operational amplifier A
2, the 3rd operational amplifier A
3, four-operational amplifier A
4It is the operational amplifier that is positioned at four identical parameters of same integrated circuit.
5. electric quantity signal online detecting method according to claim 1 is characterized in that, described CPU is the CPU with A/D sampling and computing function.
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| CN201010167221XA CN101825659B (en) | 2010-05-10 | 2010-05-10 | Electric quantity signal online detecting method |
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| CN201010167221XA CN101825659B (en) | 2010-05-10 | 2010-05-10 | Electric quantity signal online detecting method |
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| CN101825659B true CN101825659B (en) | 2012-08-29 |
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| CN102928228A (en) * | 2012-11-06 | 2013-02-13 | 昆山北极光电子科技有限公司 | Status detection circuit of bearing |
| CN109975597A (en) * | 2019-04-19 | 2019-07-05 | 常熟开关制造有限公司(原常熟开关厂） | Residual current detection method, apparatus and intelligent electrical apparatus release |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001141753A (en) * | 1999-11-16 | 2001-05-25 | Fujio Ozawa | Current and electric quantity measuring circuit |
| CN2554635Y (en) * | 2002-06-12 | 2003-06-04 | 河源市雅达电子有限公司 | Intelligence power monitoring instrument |
| CN101441593A (en) * | 2007-11-23 | 2009-05-27 | 英业达股份有限公司 | Power measuring device |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001141753A (en) * | 1999-11-16 | 2001-05-25 | Fujio Ozawa | Current and electric quantity measuring circuit |
| CN2554635Y (en) * | 2002-06-12 | 2003-06-04 | 河源市雅达电子有限公司 | Intelligence power monitoring instrument |
| CN101441593A (en) * | 2007-11-23 | 2009-05-27 | 英业达股份有限公司 | Power measuring device |
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Application publication date: 20100908 Assignee: Shanghai Chemical Industry Park Public Pipe Rack Co., Ltd. Assignor: Shanghai Xinyi Electric Technological Co., Ltd. Contract record no.: 2012310000186 Denomination of invention: Electric quantity signal online detecting method Granted publication date: 20120829 License type: Exclusive License Record date: 20120924 |
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