CN102955061A - Multi-frequency alternating-current signal measuring method - Google Patents
Multi-frequency alternating-current signal measuring method Download PDFInfo
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- CN102955061A CN102955061A CN2011102412977A CN201110241297A CN102955061A CN 102955061 A CN102955061 A CN 102955061A CN 2011102412977 A CN2011102412977 A CN 2011102412977A CN 201110241297 A CN201110241297 A CN 201110241297A CN 102955061 A CN102955061 A CN 102955061A
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Abstract
The invention discloses a multi-frequency alternating-current signal measuring method. The method includes (a), superposing various alternating-current signals with known frequency and unknown voltage and current amplitudes on one set of lines for transmission; (b), converting an alternating-current voltage signal into a small alternating current signal with a first amplitude through a voltage sensor, and converting an alternating current signal into a small alternating current signal with a second amplitude through a current sensor; (c), converting the small alternating current signal with the first amplitude into a small alternating-current voltage signal with a third amplitude through a first current voltage conversion circuit, and converting the small alternating current signal with the first amplitude into a small alternating-current voltage signal with a fourth amplitude through a second current voltage conversion circuit; (d), inputting the small alternating-current voltage signals with the third amplitude and the fourth amplitude to a filter circuit to filter high order harmonic component; and (e), inputting the filtered voltage signals to an A/D (alternating/direct) converter, inputting output data of the A/D converter to a microprocessor, and acquiring signals of multiple cycles by the microprocessor to obtain effective value of each component is by a method of look-up Fourier conversion.
Description
Technical field
The present invention relates to a kind of multi-frequency ac signal measurement method of well logging field, particularly the effective value measuring method of multi-frequency AC signal.
Background technology
Geophysical well logging or oil well logging also are in well logging, are called for short well logging, are the geophysics characteristics such as the electrochemical properties that utilizes the rock stratum, conductive characteristic, acoustic characteristic, radioactivity, and the method for measurement geophysical parameters belongs to one of applied geophysics method.During petroleum drilling, all must log well after getting into the deep degree of planned well, claim again completion logging, to obtain various oil geologies and engineering data, i.e. the information such as reservoir depth, thickness is as completion and the source book that develops oil fields.This well logging is called the bore hole well logging traditionally.And the well logging second time of under oil well, carrying out behind the complete sleeve pipe, be called traditionally production logging or development logging, this is to measure the sleeve pipe cementing quality in order to judge, need subsequently to carry out perforation, namely with special perforating gun sleeve pipe and cement mantle are partly penetrated out, made pit shaft and stratum UNICOM, reach the purpose that oil gas flows into pit shaft, then, oil gas is delivered to ground by pit shaft.
When the shared same group of circuit of the sine ac power supply of different given frequencies powered to subsurface equipment, need to measure it and respectively form the voltage of component, the effective value of electric current.At present, the effective value of common AC signal is measured in the oil well logging instrument underground power supply system, and main the employing forms component signal and separate, then to the method for each component measurement of average value.But, when measured waveform is not standard sinusoidal wave, can produce relatively large error, therefore, this is not real effective value according to the effective value that measurement of average value drew indirectly.Measure exactly the voltage of supply line, the effective value of electric current, be conducive to guarantee the normal operation of subsurface equipment, be unlikely to damage instrument or because the under-voltage instrument cisco unity malfunction that causes because of overvoltage.
In common alternating current voltage measuring circuit commonly used, in order to reduce cost and to simplify circuit, all adopt simple and easy measurement of average value, averaging circuit commonly used is half-wave (or all-wave) rectification circuit that is constituted by a diode, and sort circuit has advantages of that circuit is simple, with low cost.But sort circuit is that the relation according to the mean value of the sine wave of standard and effective value defines, so sort circuit can only be measured the sort of single-frequency, the undistorted sinusoidal ac signal of standard.For the signal that this multi-frequency AC power mixes, need to adopt a kind of new true rms measurement method to measure the effective value of each frequency component.
Summary of the invention
The present invention proposes in order to solve above-mentioned problem, and its purpose is to provide the effective value measuring method of multi-frequency AC signal of the effective value of a kind of voltage that can accurately and in real time measure each component of multi-frequency AC signal simultaneously, electric current.
Be used for realizing that the circuit of the present application comprises the voltage sensor that is connected in circuit in parallel, be connected in series in the current sensor in the circuit, the first and second current-voltage conversion circuit that is connected with described voltage sensor and current sensor respectively, the active filter circuit that is connected with the described first and second current-voltage conversion circuit, the voltage follower circuit that is connected with described active filter circuit, the A/D converter of the Multi-Channel Parallel Acquisition that is connected with described voltage follower circuit and the microprocessor that the signal from described A/D converter is carried out the data processing.
The invention provides a kind of multi-frequency ac signal measurement method, it is characterized in that,
(a) frequency is the known and multiple AC signal the unknown of electric current and voltage amplitude is superimposed upon and transmits on one group of circuit;
(b) ac voltage signal converts the alternating current small-signal of the first amplitude to through overvoltage sensor, and ac current signal converts the alternating current small-signal of the second amplitude to through over-current sensor;
(c) the alternating current small-signal of described the first amplitude is through the first current-voltage conversion circuit, convert the alternating voltage small-signal of the 3rd amplitude to, and the alternating current small-signal of described the second amplitude converts the alternating voltage small-signal of the 4th amplitude to through the second current-voltage conversion circuit;
(d) the alternating voltage small-signal of the alternating voltage small-signal of described the 3rd amplitude and described the 4th amplitude is input to active filter circuit, carries out filtering by described active filter circuit, the elimination higher hamonic wave;
(e) with the parallel A/D converter that is input to Multi-Channel Parallel Acquisition of filtered voltage signal, the output data of described A/D converter are input to microprocessor, described microprocessor gathers the signal in a plurality of cycles, asks for the effective value that each forms component by the method for the Fourier transform of tabling look-up.
In addition, in multi-frequency ac signal measurement method of the present invention, comprise three road ac voltage signals and three road ac current signals in the described multiple AC signal.
In addition, in multi-frequency ac signal measurement method of the present invention, the second order multiple feedback filter circuit that described active filter circuit is comprised of operational amplifier.
In addition, in multi-frequency ac signal measurement method of the present invention, described voltage, current measurement adopt sensor to carry out the front end signal isolation and gather.
In addition, in multi-frequency ac signal measurement method of the present invention, described the first current-voltage conversion circuit and described the second current-voltage conversion circuit consist of by sample resistance.
In addition, in multi-frequency ac signal measurement method of the present invention, the A/D converter of described Multi-Channel Parallel Acquisition can carry out synchronized sampling.
In addition, in multi-frequency ac signal measurement method of the present invention, described microprocessor has the data processing capability in real time.
In addition, in multi-frequency ac signal measurement method of the present invention, in step (e), filtered voltage signal is input to voltage follower circuit, then is input in the A/D converter of Multi-Channel Parallel Acquisition.
According to the multi-frequency ac signal measurement method of the present application, alternating voltage or electric current convert the alternating current small-signal that is easy to measure to through the large voltage of interchange or the large current signal that sensor will be not easy to measure, and play the signal isolation and dwindle effect.The alternating current small-signal converts the alternating voltage small-signal to through current-voltage conversion circuit, then, pass through again active filter circuit, signal is delivered to the A/D converter of Multi-Channel Parallel Acquisition, the output data of A/D converter are delivered to microprocessor, microprocessor gathers the signal in a plurality of cycles, the table look-up method of Fourier transform of employing is asked for the effective value that each forms component, thus, owing to adopting the collection of multicycle high-speed parallel, the real effective acquiring method that cooperates the Fourier transform of tabling look-up, so, the voltage of each component of multi-frequency AC signal can accurately and in real time be measured simultaneously, the effective value of electric current.
In addition, the present invention has circuit structure and the advantages such as programming is simple, cost suitable, the easy guarantee of electrical performance indexes.Make in this way, the measuring accuracy that each component effective value of the multi-frequency AC signal that is comprised of given frequency is measured is high, speed is fast, can be generalized to other field.
Description of drawings
Fig. 1 is electric current and voltage pre-service block diagram of the present invention.
Fig. 2 is electric current and voltage data acquisition block diagram of the present invention.
Embodiment
Below, the present invention will be described with reference to accompanying drawing.
Fig. 1 is electric current and voltage pre-service block diagram of the present invention.In Fig. 1, Vm1, Vm2 are that frequency is the ac voltage signal of 60Hz, it is from the different windings of two symmetries of same transformer, its voltage magnitude is between 0～700 volt, and Im1, Im2 are the current signals corresponding with Vm1, Vm2, and its amplitude is between 0～12 peace, Va is that frequency is the ac voltage signal of 50Hz, also between 0～700 volt, Ia is the current signal corresponding with Va to its voltage magnitude, and its amplitude is also between 0～12 peace.Six road signals of two kinds of different frequencies mix shared one group of circuit and transmit.
The ac voltage signal of three tunnel 0～700V converts the current signal of three tunnel 0～25mA to respectively through three voltage sensors, and the current signal of three tunnel 0～25mA passes through respectively sample resistance again, converts the voltage of three tunnel 0～5V to.In addition, the current signal of three tunnel 0～12 peaces converts the current signal of 0～24mA to respectively through over-current sensor, and the current signal of three tunnel 0～24mA passes through respectively sample resistance again, converts the voltage signal of three tunnel 0～24V to.
Three tunnel 0～5V after the above-mentioned current/voltage conversion of process and this six road voltage signal of three tunnel 0～24V be the second order multiple feedback filter circuit through being comprised of operational amplifier again, the elimination higher hamonic wave, become V_Vm1, V_Im1, V_Vm2, V_Im2, V_Va, V_Ia signal, then, delivering to the data acquisition processing circuit plate gathers.
Fig. 2 is electric current and voltage data acquisition block diagram of the present invention.In Fig. 2, be input to the input terminal of data acquisition circuit plate with above-mentioned six the tunnel through step-downs, the voltage signal that falls after stream and the filter preprocessing, through the voltage follower circuit that is formed by operational amplifier, then, be input to the parallel A/D converter that can carry out synchronized sampling, A/D converter is transported to the microprocessor with data processing capability in real time by parallel data bus line and gathers.
Microprocessor uses timer to carry out the timing sampling of 1mS, every 100 points of sampling of taking turns, mixed signal for 50Hz and the 60Hz of this circuit, the signal of 50Hz just in time is the sampling of 5 complete cycles, the signal of 60Hz just in time is the sampling of 6 complete cycles, try to achieve the effective value of each frequency component of the AC signal that multi-frequency mixes by the Fourier transform of tabling look-up, this effective value is the effective value through the signal after the voltage-current sensor conversion, after the current/voltage conversion, also to through certain formula conversion, obtain at last the electric current and voltage value of original signal.
Consider that the primary voltage current signal has passed through a series of conversion and passed through filtering circuit, signal is lost, and has brought a certain amount of error, so, in the situation that measuring accuracy is had relatively high expectations, can demarcate, to improve measuring accuracy.In the present invention, after demarcating, its measuring error is less than 1% in the range of whole measurement.
In addition, foregoing only is used for embodiments of the present invention are described, and is not to limit.For example, the frequency of signal is not limited only to 50Hz and 60Hz, it also can be other frequency, and, six road signals that are not limited only to two kinds of different frequencies mix and share one group of circuit and transmit, and also can be that the multiple signals of two or more frequency mix and share one group of circuit and transmit.
Claims (8)
1. a multi-frequency ac signal measurement method is characterized in that,
(a) frequency is the known and multiple AC signal the unknown of electric current and voltage amplitude is superimposed upon and transmits on one group of circuit;
(b) ac voltage signal converts the alternating current small-signal of the first amplitude to through overvoltage sensor, and ac current signal converts the alternating current small-signal of the second amplitude to through over-current sensor;
(c) the alternating current small-signal of described the first amplitude is through the first current-voltage conversion circuit, convert the alternating voltage small-signal of the 3rd amplitude to, and the alternating current small-signal of described the second amplitude converts the alternating voltage small-signal of the 4th amplitude to through the second current-voltage conversion circuit;
(d) the alternating voltage small-signal of the alternating voltage small-signal of described the 3rd amplitude and described the 4th amplitude is input to active filter circuit, carries out filtering by described active filter circuit, the elimination higher hamonic wave;
(e) with the parallel A/D converter that is input to Multi-Channel Parallel Acquisition of filtered voltage signal, the output data of described A/D converter are input to microprocessor, described microprocessor gathers the signal in a plurality of cycles, asks for the effective value that each forms component by the method for the Fourier transform of tabling look-up.
2. multi-frequency ac signal measurement method as claimed in claim 1 is characterized in that,
Comprise three road ac voltage signals and three road ac current signals in the described multiple AC signal.
3. multi-frequency ac signal measurement method as claimed in claim 1 or 2 is characterized in that, the second order multiple feedback filter circuit that described active filter circuit is comprised of operational amplifier.
4. multi-frequency ac signal measurement method as claimed in claim 1 or 2 is characterized in that, described voltage, current measurement adopt sensor to carry out the front end signal isolation and gather.
5. multi-frequency ac signal measurement method as claimed in claim 1 or 2 is characterized in that, described the first current-voltage conversion circuit and described the second current-voltage conversion circuit are made of sample resistance.
6. multi-frequency ac signal measurement method as claimed in claim 1 or 2 is characterized in that, the A/D converter of described Multi-Channel Parallel Acquisition can carry out synchronized sampling.
7. multi-frequency ac signal measurement method as claimed in claim 1 or 2 is characterized in that, described microprocessor has the data processing capability in real time.
8. multi-frequency ac signal measurement method as claimed in claim 1 or 2 is characterized in that, in step (e), filtered voltage signal is input to voltage follower circuit, then is input in the A/D converter of Multi-Channel Parallel Acquisition.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105372470A (en) * | 2014-08-18 | 2016-03-02 | 辽宁电能发展股份有限公司 | AC current filtering and sampling circuit of photovoltaic inverter |
| CN104597320B (en) * | 2014-12-24 | 2017-07-11 | 国电南瑞科技股份有限公司 | A kind of method calculated suitable for multiple frequency alternating current signals |
| CN116298492A (en) * | 2023-05-23 | 2023-06-23 | 山东棋盘信息科技有限公司 | Alternating current mixed signal detection system and method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105372470A (en) * | 2014-08-18 | 2016-03-02 | 辽宁电能发展股份有限公司 | AC current filtering and sampling circuit of photovoltaic inverter |
| CN104597320B (en) * | 2014-12-24 | 2017-07-11 | 国电南瑞科技股份有限公司 | A kind of method calculated suitable for multiple frequency alternating current signals |
| CN116298492A (en) * | 2023-05-23 | 2023-06-23 | 山东棋盘信息科技有限公司 | Alternating current mixed signal detection system and method |
| CN116298492B (en) * | 2023-05-23 | 2023-08-22 | 山东棋盘信息科技有限公司 | Alternating current mixed signal detection system and method |
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