CN102955061B - Multi-frequency alternating-current signal measuring method - Google Patents
Multi-frequency alternating-current signal measuring method Download PDFInfo
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- CN102955061B CN102955061B CN201110241297.7A CN201110241297A CN102955061B CN 102955061 B CN102955061 B CN 102955061B CN 201110241297 A CN201110241297 A CN 201110241297A CN 102955061 B CN102955061 B CN 102955061B
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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, more particularly to multi-frequency AC signal
Effective value measurement method.
Background technology
Well logging, is also geophysical log or oil well logging, referred to as logs well, and is using electrochemical properties, the conduction of rock stratum
The geophysical properties such as characteristic, acoustic characteristic, radioactivity, the method for measuring geophysical parameterses, belong to applied geophysics side
One of method.During oil drilling, all must be logged well getting into after planned well is deeply spent, it is various to obtain also known as completion logging
The information such as petroleum geology and engineering data, i.e. reservoir depth, thickness, as completion and the raw data for developing oil fields.
This well logging is traditionally referred to as bore hole well logging.And second well logging carried out after complete sleeve pipe under oil well, traditionally referred to as give birth to
Well logging or development logging are produced, this is to judge to measure sleeve pipe cementing quality, subsequently needing to carry out perforation, i.e., with special perforation
Sleeve pipe and cement sheath partial penetrating are made pit shaft and stratum UNICOM by rifle, the purpose that oil gas flows into pit shaft are reached, then, by oil gas
Ground is sent to by pit shaft.
When the sine ac power supply of different given frequencies shares same group of circuit and downhole instrument is powered, need
Measure voltage, the virtual value of electric current of its each component amount.At present, exchange common in oil well logging instrument underground power supply system
The effective value measurement of signal, it is main to be separated using composition component signal, then to the method for each component measurement of average value.But,
When measured waveform is not the sine wave of standard, relatively large error can be produced, therefore, it is this according to measurement of average value institute
The virtual value for drawing indirectly is not real virtual value.Voltage, the virtual value of electric current of supply line are accurately measured, favorably
In the normal work for ensureing downhole instrument, it is unlikely to because of excessive pressure damages instrument or due to causing under-voltage the instrument can not normal work
Make.
In conventional common alternating current voltage measuring circuit, for reduces cost and simplified circuit, all using simple average
Value measurement, conventional averaging circuit is the half-wave being constituted by a diode（Or all-wave）Rectification circuit, this circuit has circuit
Simply, advantage with low cost.But, this circuit is determining according to the meansigma methodss of the sine wave of standard with the relation of virtual value
Justice, therefore this circuit can only measure the undistorted sinusoidal ac signal of that single-frequency, standard.For this multi-frequency
The signal that alternating current power supply is mixed, needs to measure each frequency component using a kind of new true rms measurement method
Virtual value.
The content of the invention
The present invention proposes that its object is to offer one kind can be simultaneously accurate and real-time in order to solve above-mentioned problem
Voltage, the effective value measurement of the multi-frequency AC signal of the virtual value of electric current of each component of ground measurement multi-frequency AC signal
Method.
For realizing that the circuit of the present application includes being connected in parallel voltage sensor in circuit, is connected in series in electricity
Current sensor in road, the first and second current/voltage being connected with the voltage sensor and current sensor respectively
Translation circuit and the active filter circuit and the active power filtering of the connection of the described first and second current-voltage conversion circuit
The voltage follower circuit of circuit connection and the A/D converter of Multi-Channel Parallel Acquisition of voltage follower circuit connection and right
Signal from the A/D converter carries out the microprocessor of data processing.
The present invention provides a kind of multi-frequency ac signal measurement method, it is characterised in that
（a）By known to frequency and the unknown various AC signals of voltage x current amplitude are superimposed upon on one group of circuit and are passed
It is defeated；
（b）Ac voltage signal is converted into the alternating current small-signal of first amplitude through voltage sensor, also, hands over
Stream current signal is converted into the alternating current small-signal of the second amplitude through current sensor；
（c）The alternating current small-signal of the first amplitude is converted into the 3rd width through the first current-voltage conversion circuit
The alternating voltage small-signal of value, also, the alternating current small-signal of second amplitude is through the second current-voltage conversion circuit,
It is converted into the alternating voltage small-signal of the 4th amplitude；
（d）The alternating voltage small-signal of the 3rd amplitude and the alternating voltage small-signal of the 4th amplitude are input to
Active filter circuit, is filtered by the active filter circuit, filters off higher hamonic wave；
（e）Filtered voltage signal is input to into parallel the A/D converter of Multi-Channel Parallel Acquisition, the A/D converter
Output data be input to microprocessor, the microprocessor gathers the signal in multiple cycles, by Fourier transform of tabling look-up
Method asks for the virtual value of each composition component.
Additionally, in the multi-frequency ac signal measurement method of the present invention, handing over comprising three tunnels in various AC signals
Stream voltage signal and three road ac current signals.
Additionally, in the multi-frequency ac signal measurement method of the present invention, the active filter circuit is by operation amplifier
The second order multiple feedback filter circuit of device composition.
Additionally, in the multi-frequency ac signal measurement method of the present invention, the voltage, current measurement are entered using sensor
Row front end signal is isolated and collection.
Additionally, the present invention multi-frequency ac signal measurement method in, first current-voltage conversion circuit and
Second current-voltage conversion circuit is constituted by sample resistance.
Additionally, in the multi-frequency ac signal measurement method of the present invention, the A/D converter energy of the Multi-Channel Parallel Acquisition
Enough synchronize sampling.
Additionally, in the multi-frequency ac signal measurement method of the present invention, the microprocessor has generating date
Ability.
Additionally, in the multi-frequency ac signal measurement method of the present invention, in step（e）In, by filtered voltage letter
Number voltage follower circuit is input to, in being then input to 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 Jing sensors will be not easy to
The big voltage of exchange of measurement or high current signal are converted into the alternating current small-signal for being easy to measure, and play signal isolation and make with reducing
With.Alternating current small-signal Jing current-voltage conversion circuits are converted into alternating voltage small-signal, then, then through active power filtering electricity
Road, by signal the A/D converter of Multi-Channel Parallel Acquisition is sent to, and the output data of A/D converter is sent to microprocessor, microprocessor
The signal in multiple cycles is gathered, the virtual value of each composition component is asked for using the method for Fourier transform of tabling look-up, thus, due to
Gathered using multicycle high-speed parallel, coordinate the real effective acquiring method of Fourier transform of tabling look-up, thus it is possible to while accurate
And measure voltage, the virtual value of electric current of multi-frequency AC signal each component in real time.
Additionally, the present invention has circuit structure and programming are simple, cost-effective, electrical performance indexes are easily ensured etc.
Advantage.Make in this way, the survey that each component virtual value of the multi-frequency AC signal to being made up of given frequency is measured
Accuracy of measurement is high, speed is fast, can be generalized to other fields.
Description of the drawings
Fig. 1 is the voltage x current pretreatment block diagram of the present invention.
Fig. 2 is the voltage x current data acquisition block diagram of the present invention.
Specific embodiment
Hereinafter, referring to the drawings the present invention will be described.
Fig. 1 is the voltage x current pretreatment block diagram of the present invention.In FIG, Vm1, Vm2 are the alternating voltages that frequency is 60Hz
Signal, its from same transformator two symmetrical different windings, its voltage magnitude between 0～700 volt, Im1, Im2
It is current signal corresponding with Vm1, Vm2, between 0～12 peace, Va is the ac voltage signal that frequency is 50Hz to its amplitude, its
Also between 0～700 volt, Ia is current signal corresponding with Va to voltage magnitude, and its amplitude is also between 0～12 peace.Two kinds are not
Six road signals of same frequency mix shared one group of circuit and are transmitted.
The ac voltage signal of three 0～700V of tunnel is converted into the electricity of three 0～25mA of tunnel respectively through three voltage sensors
Stream signal, the current signal of three 0～25mA of tunnel is converted into the voltage of three 0～5V of tunnel again respectively through sample resistance.Additionally, three
The current signal of the peace of road 0～12 is converted into the current signal of 0～24mA, the electricity of three 0～24mA of tunnel respectively through current sensor
Stream signal is converted into the voltage signal of three 0～24V of tunnel again respectively through sample resistance.
Through the above-mentioned current/voltage conversion 0～5V of tunnel of Hou tri- and three 0～24V of tunnel this six roads voltage signal pass through again by
The second order multiple feedback filter circuit of operational amplifier composition, filters off higher hamonic wave, becomes V_Vm1, V_Im1, V_Vm2, V_
Im2, V_Va, V_Ia signal, then, is sent to data acquisition processing circuit plate and is acquired.
Fig. 2 is the voltage x current data acquisition block diagram of the present invention.In fig. 2, by above-mentioned six tunnel through blood pressure lowering, drop stream and
Voltage signal after filter preprocessing is input to the input terminal of data acquisition circuit plate, through the electricity being made up of operational amplifier
Pressure follow circuit, then, being input to can synchronize the parallel A/D converter of sampling, and A/D converter is total by parallel data
Line is transported to the microprocessor with generating date ability and is acquired.
Microprocessor carries out the timing sampling of 1mS using intervalometer, 100 points of often wheel sampling, for the 50Hz of this circuit
For the mixed signal of 60Hz, the signal of 50Hz is exactly the sampling of 5 complete cycles, and the signal of 60Hz is exactly 6 complete cycles
The sampling of phase, the virtual value of each frequency component of the AC signal of multi-frequency mixing is tried to achieve by Fourier transform of tabling look-up,
This virtual value is the virtual value of the signal after voltage-current sensor conversion, after current/voltage conversion, will also be through one
Fixed formula conversion, finally obtains the voltage x current value of primary signal.
Consider that primary voltage current signal have passed through a series of conversion and have passed through filter circuit, signal has been damaged
Lose, bring a certain amount of error, so, in the case where certainty of measurement requirement is higher, can be demarcated, to improve measurement
Precision.In the present invention, after demarcation, its measurement error is less than 1% in the range of whole measurement.
Additionally, the above is only used for illustrating embodiments of the present invention, and it is not to limit.For example, signal
Frequency be not limited only to 50Hz and 60Hz, or other frequencies, also, be not limited only to the six roads letter of two kinds of different frequencies
Number mix that shared one group of circuit is transmitted, or the multiple signals of two or more frequencies are mixed altogether
It is transmitted with one group of circuit.
Claims (8)
1. a kind of multi-frequency ac signal measurement method, it is characterised in that
（a）By known to frequency and the unknown various AC signals of voltage x current amplitude are superimposed upon on one group of circuit and are transmitted；
（b）Ac voltage signal is converted into the alternating current small-signal of first amplitude, also, alternating current through voltage sensor
Stream signal is converted into the alternating current small-signal of the second amplitude through current sensor；
（c）The alternating current small-signal of the first amplitude is converted into the 3rd amplitude through the first current-voltage conversion circuit
Alternating voltage small-signal, also, the alternating current small-signal of second amplitude is through the second current-voltage conversion circuit, conversion
Into the alternating voltage small-signal of the 4th amplitude；
（d）The alternating voltage small-signal of the 3rd amplitude and the alternating voltage small-signal of the 4th amplitude are input to active
Filter circuit, is filtered by the active filter circuit, filters off higher hamonic wave；
（e）Filtered voltage signal is input to into parallel the A/D converter of Multi-Channel Parallel Acquisition, the A/D converter it is defeated
Go out data input to microprocessor, the microprocessor gathers the signal in multiple cycles, by the method for Fourier transform of tabling look-up
Ask for the virtual value of each composition component.
2. multi-frequency ac signal measurement method as claimed in claim 1, it is characterised in that
Comprising three road ac voltage signals and three road ac current signals in various AC signals.
3. multi-frequency ac signal measurement method as claimed in claim 1 or 2, it is characterised in that the active filter circuit
The second order multiple feedback filter circuit being made up of operational amplifier.
4. multi-frequency ac signal measurement method as claimed in claim 1 or 2, it is characterised in that the voltage and current is surveyed
Amount carries out front end signal isolation and collection using sensor.
5. multi-frequency ac signal measurement method as claimed in claim 1 or 2, it is characterised in that first current/voltage
Translation circuit and second current-voltage conversion circuit are made up of sample resistance.
6. multi-frequency ac signal measurement method as claimed in claim 1 or 2, it is characterised in that the Multi-Channel Parallel Acquisition
A/D converter can synchronize sampling.
7. multi-frequency ac signal measurement method as claimed in claim 1 or 2, it is characterised in that the microprocessor has
Generating date ability.
8. multi-frequency ac signal measurement method as claimed in claim 1 or 2, it is characterised in that in step（e）In, will filter
Voltage signal after ripple is input to voltage follower circuit, in being then input to the A/D converter of Multi-Channel Parallel Acquisition.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110241297.7A CN102955061B (en) | 2011-08-22 | 2011-08-22 | Multi-frequency alternating-current signal measuring method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110241297.7A CN102955061B (en) | 2011-08-22 | 2011-08-22 | Multi-frequency alternating-current signal measuring method |
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| CN102955061A CN102955061A (en) | 2013-03-06 |
| CN102955061B true CN102955061B (en) | 2017-04-12 |
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| CN201110241297.7A Active CN102955061B (en) | 2011-08-22 | 2011-08-22 | Multi-frequency alternating-current signal measuring method |
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Families Citing this family (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 |
| 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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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPS62207964A (en) * | 1986-03-10 | 1987-09-12 | Yokogawa Electric Corp | Effective value conversion circuit |
| JPS63103975A (en) * | 1986-10-20 | 1988-05-09 | Fuji Electric Co Ltd | Current effective value measuring circuit for cycle control type electric power controller |
| CN2755616Y (en) * | 2004-12-21 | 2006-02-01 | 杜方迅 | AC effective value measuring device |
| CN201773140U (en) * | 2009-11-12 | 2011-03-23 | 中国电力科学研究院 | Alternating current and direct current hybrid electric field intensity measuring device |
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