CN114966148A - High-precision three-phase alternating current standard source for digital full-waveform recovery and working method - Google Patents
High-precision three-phase alternating current standard source for digital full-waveform recovery and working method Download PDFInfo
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- CN114966148A CN114966148A CN202210568978.2A CN202210568978A CN114966148A CN 114966148 A CN114966148 A CN 114966148A CN 202210568978 A CN202210568978 A CN 202210568978A CN 114966148 A CN114966148 A CN 114966148A
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Abstract
The invention relates to a high-precision three-phase alternating current standard source for digital full-waveform mining and a working method thereof, and the high-precision three-phase alternating current standard source comprises a main control unit connected with an upper computer, wherein the main control unit is connected with a digital control unit through a photoelectric conversion module; the digital control unit acquires a digital quantity full-waveform feedback signal from the equipment load, performs Fourier transform to obtain the phase and amplitude of a fundamental wave signal and each subharmonic signal, compares the phase and amplitude with a digital quantity control command sent by an upper computer, and triggers the next control output when a set condition is met. The influence of environmental interference and harmonic component on the system control recovery signal is eliminated, and the requirements of a three-phase alternating current standard source provided by the new national standard on outputting square waves, triangular waves and various harmonics are met.
Description
Technical Field
The invention relates to the technical field of electric power measurement, in particular to a high-precision three-phase alternating current standard source for digital full-waveform recovery and a working method.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
The three-phase alternating current standard source is an important instrument in the field of electric power metering, and can output alternating current and direct current voltage, current, phase and power meeting specific requirements.
The traditional three-phase alternating current standard source control recovery mostly adopts a zero crossing point triggering mode, the mode cannot avoid the influence of environmental interference and harmonic components on system control recovery signals, the problems of low accuracy of amplitude control and large error of phase control are caused, and further frequency spectrum analysis and high-precision output of the three-phase alternating current standard source cannot be realized.
Disclosure of Invention
In order to solve the technical problems in the background art, the invention provides a high-precision three-phase alternating current standard source for digital full-waveform recovery, which can eliminate the influence of environmental interference and harmonic components on system control recovery signals.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a high-precision three-phase alternating current standard source for digital full-waveform mining, which comprises a main control unit connected with an upper computer, wherein the main control unit is connected with a digital control unit through a photoelectric conversion module;
the digital control unit acquires a digital quantity full-waveform feedback signal from the equipment load, performs Fourier transform to obtain the phase and amplitude of a fundamental wave signal and each subharmonic signal, compares the phase and amplitude with a digital quantity control command sent by an upper computer, and triggers the next control output when a set condition is met.
The digital control unit comprises a microprocessor connected with the photoelectric conversion module, the microprocessor is respectively connected with a digital-to-analog converter and an analog-to-digital converter, the digital-to-analog converter is connected with a second operational amplifier of the power amplification unit through a first operational amplifier, and the analog-to-digital converter is connected with the operational amplifier through a first differential amplifier.
The power amplification unit comprises a second operational amplifier connected with the first operational amplifier, the second operational amplifier is connected with the power amplifier through a second differential amplifier, and the power amplifier is connected with the equipment load through a booster and a current booster respectively.
The power amplifier is connected with a power supply.
The second aspect of the invention provides a working method of a high-precision three-phase alternating current standard source for digital full-waveform mining, which comprises the following steps:
the upper computer issues a control instruction of a three-phase alternating current standard source to the main control unit, and the main control unit converts the analog quantity control instruction into a digital quantity control instruction which can be received by the digital control unit through the photoelectric conversion module according to the control instruction;
the digital control unit outputs an analog quantity control signal according to the digital quantity control instruction;
the power amplification unit carries out on-band amplification and output on the analog quantity control signal;
the booster and the current booster carry out voltage and current boosting according to the requirement of equipment load;
the output voltage and current of the equipment load are respectively subjected to voltage reduction and current reduction through the voltage transformer and the current transformer and are input into the digital control unit as feedback signals.
The digital control unit receives the feedback signal and is used for further data comparison and control output of the microprocessor, and the voltage and current signals of the three-phase alternating current standard source are uploaded to an upper computer to be displayed.
The digital control unit completes full waveform digital acquisition of the feedback signal based on a digital full waveform back-sampling mode, and comprises the following steps:
the operational amplifier acquires a feedback signal of the digital control unit, and the feedback signal is subjected to impedance conversion to meet the input requirement of the first differential amplifier;
the first differential amplifier converts the single-ended signal of the back mining into a differential signal, and suppresses common-mode interference and simultaneously amplifies the differential signal;
the analog-to-digital converter performs digital full-waveform conversion on the recovered analog quantity feedback signal and outputs a digital quantity full-waveform feedback signal to the microprocessor;
the microprocessor performs Fourier transform on the received digital quantity full-waveform feedback signal, compares the Fourier transform with a digital quantity control command, and triggers the next control output when the set requirement is met;
the digital-to-analog converter converts the digital quantity control signal output by the microprocessor into an analog quantity control signal, and the analog quantity control signal is subjected to primary operational amplification and output through the first operational amplifier.
The microprocessor performs Fourier transform on the received digital quantity full-waveform feedback signal, compares the digital quantity full-waveform feedback signal with a digital quantity control command, and triggers the next control output when the set requirement is met, and the method comprises the following steps:
the microprocessor performs discrete Fourier transform on digital sampling points acquired by the analog-to-digital converter to obtain the phase and amplitude of a fundamental wave signal and each subharmonic signal;
setting a condition threshold value for triggering the next control according to the actual requirement of control precision;
the microprocessor compares the acquired fundamental wave signal with each subharmonic wave signal and the digital quantity control command, and triggers the next control output when the absolute value of the relative error is greater than a set condition threshold, otherwise, the microprocessor does not trigger.
Compared with the prior art, the above one or more technical schemes have the following beneficial effects:
1. feedback signals are acquired in a digital full-waveform stoping mode, fundamental wave signals and harmonic signals are acquired through Fourier transform and further controlled, the influence of environmental interference and harmonic components on system control output is effectively analyzed and solved, and the control precision of a three-phase alternating current standard source is improved.
2. The method realizes the accurate analysis of frequency spectrums of fundamental wave signals and harmonic wave signals in feedback signals in a digital full-waveform stoping mode, and further completes the accurate output of square waves, triangular waves and 2-49-order harmonics of a three-phase alternating-current standard source, and the relative error is better than 0.02%.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.
FIG. 1 is a schematic diagram of a standard source structure provided by one or more embodiments of the invention;
FIG. 2 is a flow diagram illustrating standard source operating principles provided by one or more embodiments of the invention.
Detailed Description
The invention is further described with reference to the following figures and examples.
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
The following embodiments provide a high-precision three-phase alternating current standard source for digital full-waveform mining and a working method thereof, which can eliminate the influence of environmental interference and harmonic components on a system control mining signal, and meet the requirements of outputting square waves, triangular waves and various harmonics of the three-phase alternating current standard source provided by the new national standard.
The first embodiment is as follows:
a high-precision three-phase alternating current standard source for digital full-waveform mining comprises a main control unit connected with an upper computer, wherein the main control unit is connected with a digital control unit through a photoelectric conversion module;
the digital control unit obtains a digital quantity full-waveform feedback signal from the equipment load, performs Fourier transform to obtain the phase and amplitude of a fundamental wave signal and each subharmonic signal, compares the phase and amplitude with a digital quantity control instruction sent by an upper computer, and triggers the next control output.
The digital control unit comprises a microprocessor connected with the photoelectric conversion module, the microprocessor is respectively connected with a digital-to-analog converter and an analog-to-digital converter, the digital-to-analog converter is connected with a second operational amplifier of the power amplification unit through a first operational amplifier, and the analog-to-digital converter is connected with the operational amplifier through a first differential amplifier;
the power amplification unit comprises a second operational amplifier connected with the first operational amplifier, the second operational amplifier is connected with the power amplifier through a second differential amplifier, and the power amplifier is connected with the equipment load through a booster and a current booster respectively.
The power amplifier is connected with a power supply.
Specifically, the method comprises the following steps:
as shown in fig. 1, the three-phase ac standard source in the present embodiment includes an upper computer 1, a main control unit 2, a photoelectric conversion module 3, a digital control unit, a power amplification unit, a booster 11, a current booster 12, an equipment load 13, a voltage transformer 14, and a current transformer 15;
the digital control unit comprises a microprocessor 4, a digital-to-analog converter 5, an operational amplifier 6, an operational amplifier 16, a differential amplifier 17 and an analog-to-digital converter 18; the power amplification unit comprises an operational amplifier 7, a differential amplifier 8, a high-power supply 9 and a power amplifier 10;
the upper computer 1 is connected with the main control unit 2 and is used for issuing a three-phase alternating current standard source control instruction and displaying a data waveform;
the main control unit 2 is respectively connected with the upper computer 1 and the photoelectric conversion module 3 and is used for controlling and executing the control instruction issued by the upper computer 1;
the photoelectric conversion module 3 is respectively connected with the main control unit 2 and the microprocessor 4 and is used for converting an analog quantity control instruction output by the main control unit 2 into a digital quantity control instruction which can be input by the microprocessor 4;
the microprocessor 4 is respectively connected with the photoelectric conversion module 3, the analog-to-digital converter 18 and the digital-to-analog converter 5 and is used for processing and controlling digital quantity signals in the digital control unit;
the digital-to-analog converter 5 is respectively connected with the microprocessor 4 and the operational amplifier 6 (first operational amplifier) and is used for converting the digital quantity control signal output by the microprocessor 4 into an analog quantity control signal input by the operational amplifier 6;
the operational amplifier 6 (first operational amplifier) is respectively connected with the digital-to-analog converter 5 and the operational amplifier 7 and is used for the first-stage operational amplification of the analog quantity control signal output by the digital-to-analog converter 5;
the operational amplifier 7 (second operational amplifier) is respectively connected with the operational amplifier 6 and the differential amplifier 8 (second differential amplifier) and is used for the second-stage operational amplification of the analog quantity control signal output by the operational amplifier 6;
the differential amplifier 8 is respectively connected with the operational amplifier 7 and the power amplifier 10, converts the single-ended control signal output by the operational amplifier 7 into a differential signal, and is used for suppressing common-mode interference and amplifying the differential signal;
the high-power supply 9 is connected with the power amplifier 10 and used for providing required power for the power amplification unit;
the power amplifier 10 is respectively connected with the differential amplifier 8, the high-power supply 9, the booster 11 and the current booster 12 and is used for power amplification of the control signal output by the differential amplifier 8 so as to enable the differential amplifier to have load capacity;
the booster 11 is respectively connected with the power amplifier 10 and the equipment load 13 and is used for boosting voltage and providing voltage for the equipment load 13;
the current booster 12 is respectively connected with the power amplifier 10 and the equipment load 13, and is used for boosting current and providing current for the equipment load 13;
the equipment load 13 is respectively connected with the booster 11, the current booster 12, the voltage transformer 14 and the current transformer 15 and is used for loads carried by the three-phase alternating current standard source;
the voltage transformer 14 is respectively connected with the equipment load 13 and the operational amplifier 16 and is used for reducing the voltage amplitude and meeting the input voltage of the operational amplifier 16;
the current transformer 15 is respectively connected with the equipment load 13 and the operational amplifier 16 and is used for reducing the current amplitude and meeting the inputtable current of the operational amplifier 16;
the operational amplifier 16 is respectively connected with the voltage transformer 14, the current transformer 15 and the differential amplifier 17 and is used for the back sampling of the feedback signal of the digital control unit and the impedance transformation of the input end of the differential amplifier 17;
the differential amplifier 17 (a first differential amplifier) is respectively connected to the operational amplifier 16 and the analog-to-digital converter 18, and converts the single-ended extraction signal output by the operational amplifier 16 into a differential signal for suppressing common-mode interference and amplifying the differential signal;
the analog-to-digital converter 18 is respectively connected with the differential amplifier 17 and the microprocessor 4, and is used for converting the analog feedback signal output by the differential amplifier 17 into a digital feedback signal input by the microprocessor 4;
example two:
as shown in fig. 2, the operation process of the three-phase ac standard source is as follows:
1. an operator issues a control instruction of the three-phase alternating current standard source from the upper computer;
2. the main control unit controls and executes according to the control instruction, and converts the analog quantity control instruction into a digital quantity control instruction which can be received by the digital control unit through the photoelectric conversion module;
3. the digital control unit realizes the accurate output of the analog quantity control signal through the digital closed-loop control of full-waveform recovery;
4. the power amplification unit carries out on-load amplification and output on the analog quantity control signal;
5. the booster 11 and the current booster 12 carry out voltage and current boosting according to the requirement of the equipment load 13;
6. the output voltage and current of the equipment load 13 are respectively subjected to voltage reduction and current reduction through a voltage transformer 14 and a current transformer 15, and are input into the digital control unit as feedback signals;
7. the digital control unit completes full waveform digital acquisition of the feedback signal based on a digital full waveform back-sampling mode, and is used for further data comparison and control output of the microprocessor 4;
8. finally, the digital control unit uploads voltage and current signals of the three-phase alternating current standard source to the upper computer 1 in real time for data display;
the digital control unit completes full waveform digital acquisition of the feedback signal based on a digital full waveform back-sampling mode, and comprises the following steps:
1. the operational amplifier 16 collects the feedback signal of the digital control unit, and performs impedance transformation to meet the input requirement of the differential amplifier 17; for example, an operational amplifier of type OPA189 or LT1631 may be used.
2. The differential amplifier 17 converts the single-ended signal of the back-sampling into a differential signal, and amplifies the differential signal while suppressing common-mode interference; for example, a differential amplifier of type LT6604 or LTC6363 may be used.
3. The analog-to-digital converter 18 performs digital full-waveform conversion on the recovered analog quantity feedback signal and outputs a digital quantity full-waveform feedback signal to the microprocessor 4; for example, an analog-to-digital converter of the type AD1555 or LTC2500 may be used.
4. The microprocessor 4 performs Fourier transform on the digital quantity full-waveform feedback signal, compares the digital quantity full-waveform feedback signal with a digital quantity control instruction, and triggers the next control output;
5. the digital-to-analog converter 5 converts the digital quantity control signal output by the microprocessor 4 into an analog quantity control signal, and the analog quantity control signal is subjected to primary operational amplification and output through the operational amplifier 6;
6. based on the control, the digital control unit completes full waveform digital acquisition and control execution of the feedback signal;
the digital full waveform conversion of the analog quantity feedback signal comprises that an analog-to-digital converter 18 carries out digital full waveform sampling on the analog quantity feedback signal recovered from a differential amplifier 17 at a time interval of 6 microseconds, and 3333 digital sampling points of the analog quantity feedback signal are completed within a cycle of 20 milliseconds;
the microprocessor 4 performs Fourier transform on the digital quantity full-waveform feedback signal and compares the digital quantity full-waveform feedback signal with a digital quantity control instruction, and the method comprises the following steps of:
1. the microprocessor 4 performs discrete Fourier transform on the digital sampling points acquired by the analog-to-digital converter 18 to obtain the phase and amplitude of the fundamental wave signal and each subharmonic signal;
2. setting a condition threshold value for triggering the next control according to the actual requirement of control precision;
3. the microprocessor 4 compares the acquired fundamental wave signal with each subharmonic signal and the digital quantity control command, triggers the next control output when the absolute value of the relative error is greater than the set condition threshold, and does not trigger the next control output when the absolute value of the relative error is less than or equal to the set condition threshold;
4. based on the control result, the control output signal is accurate and stable, and the microprocessor 4 finishes the comparison of the Fourier transform of the digital full-waveform feedback signal and the digital control instruction;
when the three-phase alternating current standard source outputs square waves, triangular waves and each subharmonic wave, the microprocessor 4 performs discrete Fourier transform on the digital quantity control command to obtain a fundamental wave signal and reference information of each subharmonic wave, the fundamental wave signal and each subharmonic wave signal in the feedback signal are compared, when the absolute value of a relative error is greater than a set condition threshold value, reverse harmonic waves are output to process interference harmonic waves, and when the absolute value of the relative error is less than or equal to the set condition threshold value, the next control output is not triggered; the precise output of the three-phase alternating current standard source square wave, the triangular wave and each subharmonic wave is realized through the digital closed-loop control and adjustment of the full-wave recovery of the microprocessor 4.
The standard source acquires feedback signals in a digital full-waveform stoping mode, fundamental wave signals and harmonic signals are acquired through Fourier transform for further control, the influence of environmental interference and harmonic components on system control output is effectively analyzed and solved, and the control precision of the three-phase alternating current standard source is improved.
The frequency spectrum of fundamental wave signals and harmonic wave signals in feedback signals is accurately analyzed in a digital full-waveform stoping mode, meanwhile, accurate output of three-phase alternating current standard source square waves, triangular waves and 2-49 harmonic waves is further completed, and the relative error is better than 0.02%.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The utility model provides a high accuracy three-phase interchange standard source of digital full wave form stoping which characterized in that: the device comprises a main control unit connected with an upper computer, wherein the main control unit is connected with a digital control unit through a photoelectric conversion module, the digital control unit is connected with a power amplification unit, the power amplification unit is respectively connected with a device load through a booster and a current booster, and the device load is respectively connected with a current transformer and a voltage transformer;
the digital control unit acquires a digital quantity full-waveform feedback signal from the equipment load, performs Fourier transform to obtain the phase and amplitude of a fundamental wave signal and each subharmonic signal, compares the phase and amplitude with a digital quantity control command sent by an upper computer, and triggers the next control output when a set condition is met.
2. A high accuracy three phase ac standard source for digital full waveform mining as claimed in claim 1, wherein: the digital control unit comprises a microprocessor connected with the photoelectric conversion module, the microprocessor is respectively connected with a digital-to-analog converter and an analog-to-digital converter, the digital-to-analog converter is connected with a second operational amplifier of the power amplification unit through a first operational amplifier, and the analog-to-digital converter is connected with the operational amplifier through a first differential amplifier.
3. A high accuracy three phase ac standard source for digital full waveform mining as claimed in claim 1, wherein: the power amplification unit comprises a second operational amplifier connected with the first operational amplifier, the second operational amplifier is connected with the power amplifier through a second differential amplifier, and the power amplifier is connected with the equipment load through a booster and a current booster respectively.
4. A high accuracy three phase ac standard source for digital full waveform mining as claimed in claim 1, wherein: the power amplifier is connected with a power supply.
5. The operating method of the three-phase alternating current standard source according to claim 1, characterized in that: the method comprises the following steps:
the upper computer issues a control instruction of a three-phase alternating current standard source to the main control unit, and the main control unit converts the analog quantity control instruction into a digital quantity control instruction which can be received by the digital control unit through the photoelectric conversion module according to the control instruction;
the digital control unit outputs an analog quantity control signal according to the digital quantity control instruction;
the power amplification unit carries out on-band amplification and output on the analog quantity control signal;
the booster and the current booster boost the voltage and the current according to the requirement of the equipment load;
the output voltage and current of the equipment load are respectively subjected to voltage reduction and current reduction through the voltage transformer and the current transformer and are input into the digital control unit as feedback signals.
6. The method of operation of claim 5, wherein: the digital control unit obtains the feedback signal, is used for further data comparison and control output of the microprocessor, and uploads the voltage and current signals of the three-phase alternating current standard source to the upper computer for display.
7. The method of operation of claim 6, wherein: the digital control unit acquires a feedback signal, and specifically comprises the following steps:
the operational amplifier collects a feedback signal of the digital control unit and transmits the feedback signal to the first differential amplifier through impedance conversion;
the first differential amplifier converts the single-ended signal of the back mining into a differential signal, suppresses common-mode interference, simultaneously amplifies the differential signal and transmits the differential signal to the analog-to-digital converter;
the analog-to-digital converter performs digital full-waveform conversion on the recovered analog quantity feedback signal and outputs a digital quantity full-waveform feedback signal to the microprocessor.
8. The method of operation of claim 7, wherein: the digital control unit acquires a feedback signal, and further comprises:
the microprocessor carries out Fourier transform on the received digital quantity full-waveform feedback signal, compares the Fourier transform with a digital quantity control command, and triggers the next control output when the set requirement is met.
9. The method of operation of claim 7, wherein: the digital control unit acquires a feedback signal, and further comprises:
the digital-to-analog converter converts the digital quantity control signal output by the microprocessor into an analog quantity control signal, and the analog quantity control signal is subjected to primary operational amplification by the first operational amplifier and is output to the second operational amplifier.
10. The method of operation of claim 8, wherein: the microprocessor performs Fourier transform on the digital quantity full-waveform feedback signal and compares the digital quantity full-waveform feedback signal with a digital quantity control command, and triggers the next control output when the set requirement is met, wherein the method specifically comprises the following steps:
the microprocessor performs discrete Fourier transform on digital sampling points acquired by the analog-to-digital converter to obtain the phase and amplitude of a fundamental wave signal and each subharmonic signal;
setting a condition threshold value for triggering the next control according to the requirement of control precision;
the microprocessor compares the acquired fundamental wave signal with each subharmonic wave signal and the digital quantity control command, and triggers the next control output when the absolute value of the relative error is greater than a set condition threshold, otherwise, the microprocessor does not trigger.
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|---|---|---|---|---|
| CN116577536A (en) * | 2023-07-10 | 2023-08-11 | 烟台东方威思顿电气有限公司 | Three-phase alternating current standard source based on waveform-amplitude separation control |
| CN116577536B (en) * | 2023-07-10 | 2023-09-15 | 烟台东方威思顿电气有限公司 | Three-phase alternating current standard source based on waveform-amplitude separation control |
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