CN118624975A - AC quantum power calibrating device and method - Google Patents
AC quantum power calibrating device and method Download PDFInfo
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Abstract
The invention relates to the technical field of power spread spectrum, and discloses an alternating current quantum power calibrating device and method, which are characterized in that a magnetic modulation type current comparator and a resistive voltage divider are adopted to perform proportional conversion, the high-accuracy proportional conversion of kHz alternating voltage and current can be realized by utilizing the device characteristics of the magnetic modulation type current comparator and the resistive voltage divider, the quantized tracing of higher-frequency alternating current power is satisfied, the quantum voltage standard instrument is used for generating a quantum voltage signal with the same frequency as a voltage signal of the tested equipment, the low-amplitude voltage signal and the quantum voltage signal are used for carrying out differential operation, the quantized measurement power of the tested equipment is determined according to a differential operation result, and the difference between the quantized measurement power of the tested equipment and the tested alternating current power is compared, so that the tested equipment is verified, the accuracy of calibrating the alternating current power up to kHz is improved, and the broadband metering capability of a power system is improved.
Description
Technical Field
The invention relates to the technical field of power spread spectrum, in particular to an alternating current quantum power calibrating device and method.
Background
With the rapid development of novel power systems, large-scale new energy and power electronic equipment are continuously connected into a power grid, so that the voltage and current signals of the power grid are characterized by wide frequency, dynamic and the like. In the future, metering instruments or devices with wider frequency bands are widely applied to the electric energy metering of an electric power system.
The quantum power standard takes a quantum voltage standard as a core, and voltage and current signals forming a power signal are traced to the quantum voltage standard signal, so that the quantized measurement of power is realized. Currently, the "standard source" method and the "standard table" method are mainly adopted for the quantization measurement of power to establish the quantum power standard.
The quantum power standard established by the standard source method adopts a voltage amplifier and a transconductance amplifier with high stability so as to realize high-accuracy output of alternating voltage and current. Overall, the established quantum power standard requires complex feedback control, which results in complex overall systems, inconvenient operation, and high costs.
The standard table method is adopted to construct an alternating current quantum power standard, and the standard is essentially a standard table, not a high-accuracy power source, and can be directly used for measuring the alternating current power to be measured. Compared with an alternating current quantum power source constructed based on a standard source method, the alternating current quantum power standard constructed by German PTB does not need a complex feedback control system, and has the advantages of simple system, easy realization and simple and convenient operation.
Due to hysteresis effect and eddy current effect of the iron core and influence of stray inductance of the winding, accuracy of voltage and current proportion standards based on electromagnetic induction principle can be reduced along with increase of frequency, and operating frequency band is generally lower than 1 kHz. However, the ac quantum power standard is only aimed at tracing the power frequency ac power, the frequency band ranges from 40 Hz to 400 Hz, the ac power up to kHz is difficult to calibrate, and the main factor limiting the working frequency bands of the ac quantum power standard is that the effective frequency band of the adopted voltage and current ratio is narrower, so that the broadband metering capability of the power system is difficult to improve.
Accordingly, there is a need to research and establish ac quantum power standards with wider frequency bands to meet the urgent need to evaluate or develop electric energy meter devices with broadband characteristics.
Disclosure of Invention
The invention provides an alternating current quantum power calibrating device and method, which solve the technical problems that the current alternating current quantum power standard is only aimed at tracing the power frequency alternating current power, the alternating current power up to kHz is difficult to calibrate, the effective frequency band of the adopted voltage and current proportion is narrower, and the broadband metering capability of a power system is difficult to improve.
In view of this, a first aspect of the present invention provides an ac quantum power assay device, comprising: the device comprises an alternating current power source, a resistive voltage divider, a magnetic modulation type current comparator, a quantum voltage standard instrument and a differential sampling module;
the alternating current power source is connected with the tested equipment in parallel and is used for loading test voltage and test current to the tested equipment so that the tested equipment outputs tested alternating current power, tested voltage and tested current;
The resistive voltage divider is connected with the tested equipment and is used for carrying out proportional conversion on the tested voltage output by the tested equipment to obtain a first low-amplitude voltage signal;
The magnetic modulation type current comparator is connected with the tested equipment and is used for carrying out proportional conversion on the tested current output by the tested equipment to obtain a second low-amplitude current signal;
The quantum voltage standard instrument is used for generating a quantum voltage signal with the same frequency as the voltage signal of the tested equipment;
the differential sampling module is respectively connected with the resistive voltage divider, the magnetic modulation current comparator and the quantum voltage standard instrument, and is used for carrying out differential operation on the low-amplitude voltage signal obtained under the current preset signal switching state and the quantum voltage signal output by the quantum voltage standard instrument, determining the quantized measured power of the tested equipment according to the differential operation result, comparing the difference between the quantized measured power of the tested equipment and the measured alternating current power, and verifying the tested equipment.
Preferably, the ac power source comprises a signal generator, a first voltage amplifier and a transconductance amplifier;
the first voltage amplifier and the transconductance amplifier are respectively connected with two paths of output ports of the signal generator, and are connected in parallel.
Preferably, the quantum voltage etalon is a programmable josephson quantum voltage etalon.
Preferably, the equivalent circuit of the resistive voltage divider comprises a resistor, an inductor and a capacitor; the resistor is connected in series with the inductor, and the capacitor is connected in parallel with the resistor and the inductor respectively.
Preferably, the magnetic modulation type current comparator comprises a magnetic modulator iron core, a filter, a demodulator, a second voltage amplifier and a power amplifier which are sequentially connected in series;
The magnetic modulator iron core comprises two annular silicon steel sheet iron cores which are oppositely arranged, and excitation windings with the same number of turns are wound on the two annular silicon steel sheet iron cores.
Preferably, the differential sampling module comprises a signal change-over switch, a first digital sampling voltmeter and a second digital sampling voltmeter;
the resistive voltage divider and the magnetic modulation type current comparator are connected with one end of the signal change-over switch;
the other end of the signal change-over switch is respectively connected with the first digital sampling voltmeter and the second digital sampling voltmeter;
The quantum voltage standard instrument is connected with the first digital sampling voltmeter.
Preferably, the differential sampling module is further configured to generate a differential signal according to the differential operation result, sum voltage magnitudes corresponding to the differential signal and the quantum voltage signal to obtain a sampling signal of the low-amplitude voltage signal, and perform fourier transform on the sampling signal of the low-amplitude voltage signal to obtain a fundamental wave signal; and the device is also used for extracting the amplitude and the phase of the fundamental wave signal, and determining the quantized measurement power of the tested equipment according to the amplitude and the phase of the fundamental wave signal.
Preferably, the device under test is an electric energy meter or a power meter.
In a second aspect, the present invention further provides an ac quantum power verification method, where the ac quantum power verification device includes:
Loading test voltage and test current to the tested equipment so that the tested equipment outputs tested alternating current power, tested voltage and tested current;
Scaling the tested voltage output by the tested equipment to obtain a first low-amplitude voltage signal;
Scaling the tested current output by the tested equipment to obtain a second low-amplitude current signal;
Performing differential operation on the low-amplitude voltage signal and the quantum voltage signal which are obtained in the current preset signal switching state, and determining the quantized measurement power of the tested equipment according to a differential operation result, wherein the quantum voltage standard meter is used for generating a quantum voltage signal with the same frequency as the voltage signal of the tested equipment;
and comparing the difference between the quantized measured power of the tested equipment and the tested alternating current power, and verifying the tested equipment.
In a third aspect, the present invention also provides an electronic device including a memory and a processor;
the memory is used for storing programs;
And executing the program by the processor to realize the steps of the alternating current quantum power verification method.
From the above technical scheme, the invention has the following advantages:
The invention adopts the magnetic modulation type current comparator and the resistive voltage divider to perform proportional conversion, and utilizes the device characteristics of the magnetic modulation type current comparator and the resistive voltage divider, so that high-accuracy proportional conversion of kHz alternating voltage and current can be realized, the effective frequency band of the voltage and current proportion is wider, the quantum voltage standard instrument is utilized to generate a quantum voltage signal with the same frequency as the voltage signal of the tested equipment, the low-amplitude voltage signal and the quantum voltage signal are utilized to perform differential operation, the quantized measurement power of the tested equipment is determined according to the differential operation result, the difference between the quantized measurement power of the tested equipment and the tested alternating current power is compared, the accuracy of calibrating the alternating current power up to kHz is improved, and the broadband metering capability of the power system is improved.
Drawings
Fig. 1 is a schematic structural diagram of an ac quantum power calibration device according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of an equivalent circuit of a resistive divider according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a magnetic modulation current comparator according to an embodiment of the present invention;
FIG. 4 is a flow chart of an AC quantum power verification method according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.
Detailed Description
In order to make the present invention better understood by those skilled in the art, the following description will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be noted that the positional or positional relationship indicated by the terms such as "upper", "lower", "inner", "outer", "top/bottom", etc. are based on the positional or positional relationship shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
As shown in fig. 1, fig. 1 illustrates a structure of an ac quantum power calibration device according to the present invention.
The invention provides an alternating current quantum power calibrating device, which comprises: the device comprises an alternating current power source 100, a resistive voltage divider 200, a magnetic modulation type current comparator 300, a quantum voltage standard instrument 400 and a differential sampling module 500;
The ac power source 100 is connected in parallel with the device under test 600, and the ac power source 100 is configured to load a test voltage and a test current to the device under test 600, so that the device under test 600 outputs the ac power under test, the voltage under test, and the current under test.
As shown in fig. 1, the ac power source 100 includes a signal generator 101, a first voltage amplifier 102, and a transconductance amplifier 103; the first voltage amplifier 102 and the transconductance amplifier 103 are connected to two output ports of the signal generator 101, respectively, and the first voltage amplifier 102 and the transconductance amplifier 103 are connected in parallel.
The signal generator 101 is a dual-channel signal generator based on DSP (DIGITAL SIGNAL Processing). The first voltage amplifier 102 amplifies one path of alternating voltage signal output by the dual-channel signal generator to obtain a high-amplitude measured alternating voltage U, and the transconductance amplifier 103 transconductance amplifies the other path of voltage signal output by the dual-channel signal generator to obtain a high-amplitude measured current I.
The high-amplitude measured alternating voltage U and the high-amplitude measured current I are simultaneously applied to the measured device 600, and the measured device 600 measures and outputs the measured alternating power, the measured voltage and the measured current.
The device 600 to be tested may be a power meter or a power meter.
The resistive voltage divider 200 is connected to the tested device 600, and the resistive voltage divider 200 is configured to scale the tested voltage output by the tested device 600 to obtain a first low-amplitude voltage signal.
For the resistive voltage divider 200, its equivalent circuit in the ac state can be represented by fig. 2. The equivalent circuit of the resistive divider 200 includes a resistor R, an inductance L, and a capacitance C; the resistor R is connected in series with the inductor L, and the capacitor C is connected in parallel with the resistor R and the inductor L respectively.
The inductance L is the residual inductance of the resistive element, and the capacitance C is the equivalent parasitic capacitance inside the resistive element. The equivalent impedance of the ac resistor can be expressed as:
wherein Z is the equivalent impedance of the alternating current resistor, and omega is the angular frequency. Previous work has shown that the resistive divider 200 is fully capable of high accuracy voltage scaling over the range of 2.5 kHz.
The resistive divider 200 has good amplitude flatness and phase linearity response characteristics in the range of 4 kHz, has good linearity between phase angle deviation and frequency, and is about 60 mu rad at 5 kHz; the proportion error has better flatness in the frequency range of 10 Hz-4 kHz, and the proportion error is smaller than 4 [ mu ] V/V when the proportion error is 4 kHz.
The magnetic modulation type current comparator 300 is connected with the tested device 600, and the magnetic modulation type current comparator 300 performs proportional conversion on the tested current output by the tested device 600 to obtain a second low-amplitude current signal.
The magnetic modulation type current comparator 300 is a sensor developed based on the principles of magnetic modulation and magnetic balance, and utilizes the mechanism that a high-permeability iron core is alternately saturated under the saturation excitation of an alternating magnetic field to rapidly modulate primary side current to a secondary side coil through the equal ampere turn principle, so that the magnetic field generated by compensation current output by the secondary side coil is exactly offset with the magnetic field generated by the primary side current, and the iron core is always maintained in a zero-magnetic-flux dynamic balance state.
The scale of the scaling may be set empirically.
As shown in fig. 3, the magnetic modulation type current comparator 300 includes a magnetic modulator core, a filter, a demodulator, a second voltage amplifier, and a power amplifier connected in series in this order;
The magnetic modulator iron core comprises two annular silicon steel sheet iron cores which are oppositely arranged, and excitation windings with the same number of turns are wound on the two annular silicon steel sheet iron cores.
When the power frequency alternating current excitation voltage is applied to the excitation winding, under the condition that the measured current is zero, the waveforms of alternating magnetic fluxes phi 1 and phi 2 generated by the two iron cores are completely symmetrical due to the symmetry of a magnetization curve, and the phases of the alternating magnetic fluxes phi 1 and phi 2 are 180 degrees different, so that an alternating magnetic field phi s=phi 1+ phi 2=phi 1+ (-phi 1) =0 of the whole magnetic modulator iron core detected by the detection winding is not output by second harmonic waves.
When the measured direct current or low-frequency alternating current exists, the measured current is not equal to 0, and the alternating magnetic fields generated in the two annular silicon steel sheet iron cores are different in saturation degree in positive and negative half periods, so that asymmetrical phi '1 and phi' 2 are generated, the phases of the alternating magnetic fields still differ by 180 degrees, and the alternating magnetic field phi s=phi '1+phi' 2 of the whole magnetic modulator iron core detected in the detection winding is not equal to 0.
From fourier series decomposition, periodic signals of any shape can be decomposed into sine wave signals of different frequencies, such as fundamental waves, second harmonics, etc. Under the condition that the measured current is not equal to 0, the superposition result of alternating magnetic fluxes phi '1 and phi' 2 generated in the two annular silicon steel sheet iron cores is as follows: wherein all fundamental waves and odd harmonics are counteracted, the rest amplitude is proportional to the measured current, the even harmonics with the phase reflecting the direction of the measured current are added in phase, the amplitude of each even harmonic is attenuated rapidly along with the increase of the harmonic frequency, the maximum amplitude is the second harmonic, therefore, when the measured current is not equal to 0, the output signal mainly including the second harmonic exists in the detection winding, the signal output by the detection winding is led to the filter, the non-second harmonic is filtered, the feedback current is sent to the feedback winding of the magnetic modulator through the standard resistor after phase sensitive demodulation, current amplification and power amplification, so that the generated magnetic potential is opposite to the magnetic potential direction generated by the measured current, namely the mutual counteraction is completed, thereby realizing the magnetic potential balance, namely
W1I1=W2I2
Where I 1 is the current to be measured, W 1 is the number of turns of the current winding to be measured (typically W 1=1）,I2 is the compensation current, and W 2 is the number of turns of the compensation winding.
Because the magnetic modulation type current comparator 300 is of a differential type structure, the open loop amplification factor is very high, the second harmonic signal is changed as long as the measured current is slightly changed, and the feedback current is also changed until the two magnetic potentials are almost completely counteracted, and generally W 1=1,W2 is far greater than W 1, so that the large current measurement can be converted into the measurement of small current.
Based on the above principle, the magnetic modulation current comparator 300 in the present embodiment may have a current measurement performance with a measurement range of ±800A, an accuracy of 1 ppm, a linearity of 1 ppm, a temperature drift coefficient of 0.1 ppm/K, and a frequency band of DC-500 kHz. It follows that the above performance parameters are sufficient to achieve a current ratio uncertainty of the order of 10 -6.
The quantum voltage standard 400 is used to generate a quantum voltage signal at the same frequency as the voltage signal of the device under test 600.
In practical applications, the frequency of the voltage signal of the tested device 600 may be measured first, and then the quantum voltage signal with the same frequency as the voltage signal of the tested device 600 may be generated by the quantum voltage standard instrument 400.
The quantum voltage standard 400 is a programmable josephson quantum voltage standard.
The programmable josephson quantum voltage standard (Programmable Josephson Voltage Standard, PJVS) can produce a stepped approximate quantum voltage waveform of 5 kHz, fully meeting the quantized measurement of 2.5 kHz voltage signals. Based on this, the present embodiment achieves a quantized measurement of up to 2.5 kHz ac power from the point of view of increasing the voltage-current ratio operating band. Specifically, the present embodiment adopts the resistive voltage divider 200 and the magnetic modulation current sensor to replace the conventionally used inductive voltage and current ratios based on the electromagnetic induction principle, respectively, so as to realize the quantized measurement of ac power up to 2.5 kHz.
The differential sampling module 500 is respectively connected with the resistive voltage divider 200, the magnetic modulation current comparator 300 and the quantum voltage standard instrument 400, and the differential sampling module 500 is used for performing differential operation on the low-amplitude voltage signal obtained in the current preset signal switching state and the quantum voltage signal output by the quantum voltage standard instrument 400, determining the quantized measured power of the tested device 600 according to the differential operation result, comparing the difference between the quantized measured power of the tested device 600 and the measured alternating current power, and calibrating the tested device 600.
By comparing the difference between the quantized measured power and the measured ac power of the tested device 600, if the difference between the quantized measured power and the measured ac power of the tested device 600 is smaller than a preset error threshold, the tested device 600 is determined to be qualified, and if the difference between the quantized measured power and the measured ac power of the tested device 600 is not smaller than the preset error threshold, the tested device 600 is determined to be unqualified.
Specifically, as shown in fig. 1, the differential sampling module 500 includes a signal switch SW1, a first digital sampling voltmeter 501 and a second digital sampling voltmeter 502;
The resistive voltage divider 200 and the magnetic modulation type current comparator 300 are connected with one end of a signal switching switch SW 1;
The other end of the signal switching switch SW1 is connected to the first digital sampling voltmeter 501 and the second digital sampling voltmeter 502, respectively.
The state of the switch SW1 is switched by the switching signal, so that the first low-amplitude voltage signal or the second low-amplitude current signal and the quantum voltage signal VJ are fed into the digital sampling voltmeter in a differential form.
The quantum voltage standard 400 is connected to a first digital sampling voltmeter 501.
In some embodiments, the differential sampling module 500 is further configured to generate a differential signal according to the differential operation result, sum the voltage magnitude of the differential signal corresponding to the quantum voltage signal to obtain a sampled signal of the low-amplitude voltage signal, and perform fourier transform on the sampled signal of the low-amplitude voltage signal to obtain a fundamental wave signal; and also extracts the amplitude and phase of the fundamental wave signal, and determines the quantized measured power of the device under test 600 based on the amplitude and phase of the fundamental wave signal.
Wherein the programmable josephson quantum voltage standard produces a stepped approximation quantum voltage signal.
After the fundamental wave amplitude and the phase of the voltage and current signals are obtained, p=u 0I0 cos (phi), wherein U 0、I0 is the fundamental wave amplitude of the voltage and the current, phi is the phase difference between fundamental wave phasors of the voltage and the current, and then the quantized measurement of the power is realized.
The invention adopts the magnetic modulation type current comparator and the resistive voltage divider to perform proportional conversion, and utilizes the device characteristics of the magnetic modulation type current comparator and the resistive voltage divider, so that high-accuracy proportional conversion of kHz alternating voltage and current can be realized, the quantization tracing of higher-frequency alternating current power is satisfied, the effective frequency band of the voltage and current proportion is wider, the quantum voltage standard instrument is used for generating a quantum voltage signal with the same frequency as the voltage signal of the tested equipment, the low-amplitude voltage signal and the quantum voltage signal are used for differential operation, the quantized measurement power of the tested equipment is determined according to the differential operation result, and the difference between the quantized measurement power of the tested equipment and the measured alternating current power is compared, thereby calibrating the tested equipment, improving the accuracy of calibrating the high-frequency kHz alternating current power and improving the metering capability of a power system.
As shown in fig. 4, the present invention further provides an ac quantum power verification method, which is applied to the ac quantum power verification device, and includes:
Step S1, loading test voltage and test current to tested equipment so that the tested equipment outputs tested alternating current power, tested voltage and tested current;
s2, proportional conversion is carried out on the detected voltage output by the detected equipment, and a first low-amplitude voltage signal is obtained;
S3, proportional conversion is carried out on the detected current output by the detected equipment, and a second low-amplitude current signal is obtained;
Step S4, performing differential operation on the low-amplitude voltage signal and the quantum voltage signal which are obtained in the current preset signal switching state, and determining the quantized measurement power of the tested equipment according to the differential operation result, wherein the quantum voltage standard instrument is used for generating a quantum voltage signal with the same frequency as the voltage signal of the tested equipment;
and S5, comparing the difference between the quantized measured power of the tested equipment and the tested alternating current power, and verifying the tested equipment.
As shown in fig. 5, the present invention also provides an electronic device, the electronic device 10 comprising a memory 20 and a processor 30;
the memory 20 is used for storing programs;
processor 30 executes the steps of the program to implement the ac quantum power verification method described above.
It will be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working process of the electronic device in the above-described method may refer to the corresponding process in the foregoing apparatus embodiment, which is not described herein again.
In several embodiments provided by the present invention, it will be understood that each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved.
In the several embodiments provided in the present invention, it should be understood that the disclosed apparatus, electronic device and method may be implemented in other manners. For example, the apparatus embodiments described above are merely illustrative, e.g., the division of elements is merely a logical functional division, and there may be additional divisions of actual implementation, e.g., multiple elements or components may be combined or integrated into another system, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or units, which may be in electrical, mechanical or other form.
The above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. An ac quantum power assay device, comprising: the device comprises an alternating current power source, a resistive voltage divider, a magnetic modulation type current comparator, a quantum voltage standard instrument and a differential sampling module;
the alternating current power source is connected with the tested equipment in parallel and is used for loading test voltage and test current to the tested equipment so that the tested equipment outputs tested alternating current power, tested voltage and tested current;
The resistive voltage divider is connected with the tested equipment and is used for carrying out proportional conversion on the tested voltage output by the tested equipment to obtain a first low-amplitude voltage signal;
The magnetic modulation type current comparator is connected with the tested equipment and is used for carrying out proportional conversion on the tested current output by the tested equipment to obtain a second low-amplitude current signal;
The quantum voltage standard instrument is used for generating a quantum voltage signal with the same frequency as the voltage signal of the tested equipment;
the differential sampling module is respectively connected with the resistive voltage divider, the magnetic modulation current comparator and the quantum voltage standard instrument, and is used for carrying out differential operation on the low-amplitude voltage signal obtained under the current preset signal switching state and the quantum voltage signal output by the quantum voltage standard instrument, determining the quantized measured power of the tested equipment according to the differential operation result, comparing the difference between the quantized measured power of the tested equipment and the measured alternating current power, and verifying the tested equipment.
2. The ac quantum power assay device of claim 1, wherein the ac power source comprises a signal generator, a first voltage amplifier, and a transconductance amplifier;
the first voltage amplifier and the transconductance amplifier are respectively connected with two paths of output ports of the signal generator, and are connected in parallel.
3. The ac quantum power assay device of claim 1, wherein the quantum voltage etalon is a programmable josephson quantum voltage etalon.
4. The ac quantum power assay device of claim 1, wherein the equivalent circuit of the resistive divider comprises a resistor, an inductor, and a capacitor; the resistor is connected in series with the inductor, and the capacitor is connected in parallel with the resistor and the inductor respectively.
5. The ac quantum power assay device of claim 1, wherein the magnetically modulated current comparator comprises a magnetic modulator core, a filter, a demodulator, a second voltage amplifier, and a power amplifier in series in sequence;
The magnetic modulator iron core comprises two annular silicon steel sheet iron cores which are oppositely arranged, and excitation windings with the same number of turns are wound on the two annular silicon steel sheet iron cores.
6. The ac quantum power assay device of claim 1, wherein the differential sampling module comprises a signal transfer switch, a first digital sampling voltmeter, and a second digital sampling voltmeter;
the resistive voltage divider and the magnetic modulation type current comparator are connected with one end of the signal change-over switch;
the other end of the signal change-over switch is respectively connected with the first digital sampling voltmeter and the second digital sampling voltmeter;
The quantum voltage standard instrument is connected with the first digital sampling voltmeter.
7. The ac quantum power verification device according to claim 1, wherein the differential sampling module is further configured to generate a differential signal according to the differential operation result, sum voltage magnitudes corresponding to the differential signal and a quantum voltage signal to obtain a sampled signal of the low-amplitude voltage signal, and perform fourier transform on the sampled signal of the low-amplitude voltage signal to obtain a fundamental wave signal; and the device is also used for extracting the amplitude and the phase of the fundamental wave signal, and determining the quantized measurement power of the tested equipment according to the amplitude and the phase of the fundamental wave signal.
8. The ac quantum power verification device of claim 1, wherein the device under test is an electric energy meter or a power meter.
9. An ac quantum power verification method, applying the ac quantum power verification device of any one of claims 1 to 8, comprising:
Loading test voltage and test current to the tested equipment so that the tested equipment outputs tested alternating current power, tested voltage and tested current;
Scaling the tested voltage output by the tested equipment to obtain a first low-amplitude voltage signal;
Scaling the tested current output by the tested equipment to obtain a second low-amplitude current signal;
Performing differential operation on the low-amplitude voltage signal and the quantum voltage signal which are obtained in the current preset signal switching state, and determining the quantized measurement power of the tested equipment according to a differential operation result, wherein the quantum voltage standard meter is used for generating a quantum voltage signal with the same frequency as the voltage signal of the tested equipment;
and comparing the difference between the quantized measured power of the tested equipment and the tested alternating current power, and verifying the tested equipment.
10. An electronic device comprising a memory and a processor;
the memory is used for storing programs;
the processor executing the program performs the steps of the ac quantum power verification method of claim 9.
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