A power measurement device and method

Abstract

The application provides a power measurement device and method. A conversion module of the power measurement device is configured to convert a to-be-measured voltage into a first conversion voltage and to convert a to-be-measured current into a second conversion voltage. A standard voltage source is a standard quantum voltage source for generating a standard quantum voltage in a staircase waveform. A first analog-to-digital converter / second analog-to-digital converter is configured to obtain a first voltage difference / second voltage difference based on the standard quantum voltage and the first conversion voltage / second conversion voltage, and the first voltage difference / second voltage difference is used to compensate a second sampling value / first sampling value. A processor is configured to obtain a to-be-measured power based on the first sampling value and the second sampling value. In the application, one of the first analog-to-digital converter or the second analog-to-digital converter is configured to generate the first voltage difference or the second voltage difference, and the first voltage difference or the second voltage difference is used to compensate a sampling value of the other of the first analog-to-digital converter or the second analog-to-digital converter, so that continuous full sampling is achieved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of power measurement, and particularly relates to a power measurement device and method. BACKGROUND

[0002] Currently, an alternating current sub-voltage source, i.e., a programmable Josephson voltage standard (PJVS), is used to measure alternating current power. The specific measurement process is as follows: the voltage channel and the current channel of the power to be measured correspond to sine signals respectively, and the PJVS generates a step wave corresponding to each sine signal; for each sine signal, the amplitude of the sine signal is determined according to the difference between the sine signal and the step wave corresponding to the sine signal, and the amplitude of the corresponding step wave; and the power to be measured is determined based on the amplitude of each sine signal and the phase difference between two sine signals.

[0003] However, the current power measurement device has the problem of being unable to sample in the whole process. SUMMARY

[0004] The application aims to provide a power measurement device and method, and aims to solve the problem of the power measurement device in the prior art being unable to sample in the whole process.

[0005] A first aspect of the application provides a power measurement device, comprising:

[0006] a conversion module, configured to obtain a to-be-measured voltage and a to-be-measured current, and convert the to-be-measured voltage into a first conversion voltage and the to-be-measured current into a second conversion voltage;

[0007] a standard voltage source, which is an alternating current sub-voltage source, and is configured to generate a standard quantum voltage in the form of a step wave;

[0008] a first analog-to-digital converter, configured to output a first sampling value based on the standard quantum voltage and the first conversion voltage;

[0009] a second analog-to-digital converter, configured to output a second sampling value based on the standard quantum voltage and the second conversion voltage; wherein the first analog-to-digital converter is configured to obtain a first voltage difference value based on the standard quantum voltage and the first conversion voltage, and the second analog-to-digital converter is configured to compensate the second sampling value based on the first voltage difference value; or the second analog-to-digital converter is configured to obtain a second voltage difference value based on the standard quantum voltage and the second conversion voltage, and the first analog-to-digital converter is configured to compensate the first sampling value based on the second voltage difference value;

[0010] a processor, configured to obtain a to-be-measured power based on the first sampling value and the second sampling value.

[0011] In some embodiments of the present application, the standard voltage source is a programmable Josephson quantum voltage source.

[0012] In some embodiments of the present application, the power measurement device further comprises a first switch and a second switch, one end of the first switch is connected to the first analog-digital converter, the other end of the first switch is selectively connected to the standard voltage source or grounded; one end of the second switch is connected to the first analog-digital converter, the other end of the second switch is selectively connected to the conversion module or grounded.

[0013] The first analog-digital converter is used for zero static calibration when the first switch and the second switch are grounded.

[0014] In some embodiments of the present application, the power measurement device further comprises a third switch, one end of the third switch is connected to the second switch connected to one end of the conversion module, the other end of the third switch is selectively connected to the conversion module or the standard voltage source; the first analog-digital converter is used for initial value static calibration when the third switch and the first switch are connected to the standard voltage source, and the second switch is connected to the third switch.

[0015] In some embodiments of the present application, the power measurement device further comprises a fourth switch and a fifth switch, one end of the fourth switch is connected to the second analog-digital converter, the other end of the fourth switch is selectively connected to the standard voltage source or grounded; the second analog-digital converter is used for zero static calibration when the fourth switch and the fifth switch are grounded.

[0016] In some embodiments of the present application, the power measurement device further comprises a sixth switch, one end of the sixth switch is connected to the fifth switch connected to one end of the conversion module, the other end of the sixth switch is selectively connected to the conversion module or the standard voltage source; the second analog-digital converter is used for initial value static calibration when the sixth switch and the fourth switch are connected to the standard voltage source, and the fifth switch is connected to the fourth switch.

[0017] In some embodiments of the present application, the power measurement device comprises a first conversion device, the first conversion device is used for receiving the to-be-measured voltage and converting the to-be-measured voltage into the first conversion voltage according to a first target scaling factor.

[0018] And / or, the power measurement device comprises a second conversion device, the second conversion device is used for receiving the to-be-measured current and converting the to-be-measured current into the second conversion voltage according to a first target scaling coefficient.

[0019] In a second aspect, the present application further provides a power measurement method, which is applied to the power measurement device as described above, and the power measurement method comprises the following steps:

[0020] obtaining a first voltage difference value based on the standard quantum voltage and the first conversion voltage, or obtaining a second voltage difference value based on the standard quantum voltage and the second conversion voltage;

[0021] compensating a second sampling value of the second analog-digital converter based on the first voltage difference value, or compensating a first sampling value of the first analog-digital converter based on the second voltage difference value;

[0022] obtaining a to-be-measured power based on the first sampling value and the second sampling value.

[0023] In some embodiments of the present application, before the step of obtaining the first voltage difference value based on the standard quantum voltage and the first conversion voltage, or obtaining the second voltage difference value based on the standard quantum voltage and the second conversion voltage, the power measurement method further comprises:

[0024] grounding the first switch and the second switch to perform zero static calibration on the first analog-digital converter;

[0025] Or, grounding the fourth switch and the fifth switch to perform zero static calibration on the second analog-digital converter.

[0026] In some embodiments of the present application, before the step of obtaining the first voltage difference value based on the standard quantum voltage and the first conversion voltage, or obtaining the second voltage difference value based on the standard quantum voltage and the second conversion voltage, the power measurement method further comprises:

[0027] connecting the third switch and the first switch to the standard voltage source, and connecting the second switch to the third switch to perform initial value static calibration on the first analog-digital converter;

[0028] Or, connecting the sixth switch and the fourth switch to the standard voltage source, and connecting the fifth switch to the sixth switch to perform initial value static calibration on the second analog-digital converter.

[0029] In some embodiments of the present application, the power measurement method further comprises:

[0030] detecting whether the electric energy meter has pulse output;

[0031] If there is a pulse output, an error value of the power under test / power under test is calculated based on the pulse output.

[0032] The power measuring device and method provided by the application have the beneficial effects that the power measuring device comprises a conversion module, a standard voltage source, a first analog-digital converter, a second analog-digital converter and a processor; the conversion module is used to acquire a voltage under test and a current under test, and convert the voltage under test into a first conversion voltage and the current under test into a second conversion voltage; the standard voltage source is an AC quantum voltage source, and is used to generate a standard quantum voltage in a step waveform; the first analog-digital converter is used to output a first sampling value based on the standard quantum voltage and the first conversion voltage; the second analog-digital converter is used to output a second sampling value based on the standard quantum voltage and the second conversion voltage; wherein the first analog-digital converter is used to obtain a first voltage difference value based on the standard quantum voltage and the first conversion voltage, and the second analog-digital converter is used to compensate the second sampling value based on the first voltage difference value; or the second analog-digital converter is used to obtain a second voltage difference value based on the standard quantum voltage and the second conversion voltage, and the first analog-digital converter is used to compensate the first sampling value based on the second voltage difference value; the processor is used to obtain the power under test based on the first sampling value and the second sampling value; in the application, one of the first analog-digital converter or the second analog-digital converter is used to generate the first voltage difference value or the second voltage difference value, and the first voltage difference value or the second voltage difference value is used to compensate the sampling value of the other one of the first analog-digital converter or the second analog-digital converter, so that continuous full sampling is realized. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 A schematic structural diagram of a power measuring device provided by an embodiment of the application is shown;

[0034] Figure 2 A schematic structural diagram of a power measuring device provided by another embodiment of the application is shown;

[0035] Figure 3 A schematic diagram of steps of a power measuring method provided by an embodiment of the application is shown.

[0036] Specific element symbol explanations: K1A-first switch piece, K1B-second switch piece, K3A-third switch piece, K2A-fourth switch piece, K2B-fifth switch piece, K3B-sixth switch piece, U8A-first analog-digital converter, U8B-second analog-digital converter, U3-first converter piece, U4-second converter piece, U5-processor. DETAILED DESCRIPTION

[0037] In order to make the technical problems, technical solutions and beneficial effects of the present application clearer, the present application will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only intended to explain the present application and not to limit the present application.

[0038] It should be noted that when an element is referred to as being "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0039] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specifically limited.

[0040] It should be noted that with the rapid development of global technology, especially in the fields of power, electronic measurement and energy management, the accuracy and reliability of power and energy measurement are increasingly required. Internationally, the quantum power and energy standard technology, as the cornerstone to ensure the accuracy of energy measurement, mainly includes "standard power source" scheme and "standard power meter" scheme. Both schemes are based on Josephson quantum voltage (Josephson Voltage Standard, JVS) as the traceable reference, providing unprecedented precision and stability for energy and power measurement.

[0041] The standard power source scheme generates a standard power signal that can be directly used to calibrate power or energy measurement devices by amplifying the Josephson quantum voltage with a high-voltage amplifier and a large-current transconductance amplifier. The core of this scheme is to use high-precision voltage power amplifiers and transconductance power amplifiers to achieve accurate amplification and calibration of signals. However, in order to overcome the influence of the transition process of the PJVS (programmable Josephson voltage reference) and the Gibbs phenomenon, the standard power source needs to have very high stability. However, the development of high-stability power sources is difficult, costly, and requires complex phase separation for 0.5L (inductive load) and 0.5C (capacitive load), increasing the complexity of control. At the same time, the standard power source scheme requires a high technical threshold for precise voltage power amplifiers and transconductance power amplifiers, which is too expensive to use. And the Josephson quantum voltage needs to work in a low-temperature environment close to absolute zero (about 4K), and is very sensitive to ground and interference signals. This requires the standard power source scheme to run in a standard laboratory environment, increasing the complexity of operation and maintenance.

[0042] The standard power meter scheme converts the voltage and current components in the power or energy signal to be measured into small voltages through a voltage divider and a current sensor, and then performs a differential measurement with the quantum voltage as a reference, thereby realizing value transfer. The standard power meter scheme acquires the difference values of the voltage and PJVS signals and the difference values of the current signal and PJVS through two differential sampling channels, reconstructs the original signal values through the difference value signals, and calculates the power value. However, this process requires extremely high accuracy for differential measurement, and any slight error can significantly affect the final result. Similarly, like the standard power source scheme, the standard power meter scheme also needs to overcome the influence of the transition process and Gibbs phenomenon of the PJVS to ensure the accuracy and stability of the measurement. Similarly, since the quantum voltage needs to work in a low-temperature environment close to absolute zero, the standard power meter scheme can only be operated in a standard laboratory environment, limiting its flexibility in practical applications.

[0043] Based on this, the traditional power measurement device and method are improved.

[0044] Please refer to Figure 1 , Figure 1 The frame structure schematic diagram of the power measurement device provided by the embodiment is shown in Figure 1 The two mirror combination ADCs in correspond to the first analog-to-digital converter U8A and the second analog-to-digital converter U8B, the DSP control corresponds to the processor U5, and the PJVS corresponds to the standard voltage source. The power measurement device of the embodiment includes a conversion module, a standard voltage source, a first analog-to-digital converter U8A, a second analog-to-digital converter U8B, and a processor U5.

[0045] It should be explained that the conversion module is responsible for obtaining the voltage and current signals to be measured and converting them into voltage signals suitable for subsequent processing. The role of the conversion module is to convert the measured voltage and current with large signal amplitude into a signal with a signal amplitude close to the standard quantum voltage. Exemplarily, the signal amplitude can be 1V. Two analog-to-digital converters can be used to sample the voltage signals of the first converted voltage, the second converted voltage, and the standard quantum voltage.

[0046] The conversion module of the embodiment is used to acquire a to-be-measured voltage and a to-be-measured current, and convert the to-be-measured voltage into a first conversion voltage and the to-be-measured current into a second conversion voltage; the standard voltage source is a quantum sub-voltage source and is used to generate a standard quantum voltage in a step waveform; the first analog-digital converter U8A is used to output a first sampling value based on the standard quantum voltage and the first conversion voltage; the second analog-digital converter U8B is used to output a second sampling value based on the standard quantum voltage and the second conversion voltage; wherein the first analog-digital converter U8A is used to obtain a first voltage difference value based on the standard quantum voltage and the first conversion voltage, and the second analog-digital converter U8B is used to compensate the second sampling value based on the first voltage difference value; or the second analog-digital converter U8B is used to obtain a second voltage difference value based on the standard quantum voltage and the second conversion voltage, and the first analog-digital converter U8A is used to compensate the first sampling value based on the second voltage difference value; and the processor U5 is used to obtain a to-be-measured power based on the first sampling value and the second sampling value.

[0047] It can be understood that the transition process of the standard voltage source needs to be discarded in the current power measurement device, causing fragment sampling, however, in the present application, one of the first analog-digital converter U8A or the second analog-digital converter U8B is used to generate a first voltage difference value or a second voltage difference value, and the first voltage difference value or the second voltage difference value is used to compensate the sampling value of the other one of the first analog-digital converter U8A or the second analog-digital converter U8B, so as to realize continuous full sampling.

[0048] In addition, by setting the voltage difference value of one of the first analog-digital converter U8A or the second analog-digital converter U8B to compensate the sampling value of the other one, it is beneficial to reduce the demand of the power measurement device on the stability of the power source. For example, the power measurement device in the present embodiment does not need a high-precision power source of ppm (parts per million) level, but only needs a common 0.05-level power source.

[0049] Specifically, the first and second analog-to-digital converters U8B are used in some embodiments of the present application, which have high consistency (better than 0.3ppm) and good short-term stability (better than 0.3ppm). One of the first and second analog-to-digital converters U8B is calibrated in real time by the linearity of the low-frequency step wave output by the standard power source and generates a dynamic compensation voltage (corresponding to the first voltage difference or the second voltage difference), and the other of the first and second analog-to-digital converters U8B compensates its sampling value in real time according to the dynamic compensation voltage, thereby achieving continuous full sampling and avoiding the influence of the transition process of the standard power source and the Gibbs phenomenon. The power measurement device of the present application greatly reduces the stability requirement of the power source, and can use the direct sampling method without the complex and time-consuming synchronization process of the power source and the standard power source, which has the benefits of simple and direct sampling, continuous sampling process, greatly simplified stability requirement of the power source, and no need for standard power source and power source synchronization.

[0050] In some embodiments of the present application, please continue to refer to Figure 1 and refer to Figure 2 , Figure 2 The signal waveform schematic diagram of the standard voltage source provided by the present embodiment is shown. The standard voltage source of the present embodiment is a programmable Josephson quantum voltage source. It can be understood that the DC accuracy of the PJVS can be 10 -8 which is one level higher than the AC accuracy. Through the combination of the first and second analog-to-digital converters U8A and U8B in the present embodiment, the original AC detection accuracy can be directly traced to the DC step voltage of the PJVS. (In the middle position of the 50mS PJVS step wave, the influence of the rising and falling edges of the PJVS can be ignored)

[0051] In some embodiments of the present application, please continue to refer to Figure 1 The power measurement device of the present embodiment further includes a first switch K1A and a second switch K1B. One end of the first switch K1A is connected to the first analog-to-digital converter U8A, and the other end of the first switch K1A is selectively connected to the standard voltage source or grounded. One end of the second switch K1B is connected to the first analog-to-digital converter U8A, and the other end of the second switch K1B is selectively connected to the conversion module or grounded. The first analog-to-digital converter U8A is used for zero static calibration when the first and second switches K1A and K1B are grounded. It can be understood that zero static calibration is beneficial to improve the accuracy of the first analog-to-digital converter U8A.

[0052] In some embodiments of the present application, please continue to refer to Figure 1The power measurement device of the embodiment further comprises a third switch K3A, one end of the third switch K3A is connected to one end of the conversion module, and the other end of the third switch K3A is selectively connected to the conversion module or a standard voltage source; the first analog-to-digital converter U8A is used to perform initial value static calibration when the third switch K3A and the first switch K1A are both connected to the standard voltage source, and the second switch K1B is connected to the third switch K3A. It can be understood that the initial value static calibration is beneficial to improve the accuracy of the first analog-to-digital converter U8A.

[0053] In some embodiments of the present application, please refer to Figure 1 The power measurement device of the embodiment further comprises a fourth switch K2A and a fifth switch K2B, one end of the fourth switch K2A is connected to the second analog-to-digital converter U8B, and the other end of the fourth switch K2A is selectively connected to a standard voltage source or ground; the second analog-to-digital converter U8B is used to perform zero static calibration when the fourth switch K2A and the fifth switch K2B are grounded.

[0054] It can be understood that the zero static calibration is beneficial to improve the accuracy of the second analog-to-digital converter U8B.

[0055] In some embodiments of the present application, please refer to Figure 1 The power measurement device of the embodiment further comprises a sixth switch K3B, one end of the sixth switch K3B is connected to one end of the conversion module, and the other end of the sixth switch K3B is selectively connected to the conversion module or a standard voltage source; the second analog-to-digital converter U8B is used to perform initial value static calibration when the sixth switch K3B and the fourth switch K2A are both connected to the standard voltage source, and the fifth switch K2B is connected to the fourth switch K2A. It can be understood that the initial value static calibration is beneficial to improve the accuracy of the second analog-to-digital converter U8B.

[0056] In some embodiments, the first analog-to-digital converter U8A and the second analog-to-digital converter U8B are both subjected to zero static calibration and initial value static calibration, which is beneficial to improve the consistency of the characteristics of the first analog-to-digital converter U8A and the second analog-to-digital converter U8B.

[0057] In some embodiments of the present application, please refer to Figure 1 The power measurement device of the embodiment comprises a first conversion device U3, the first conversion device U3 is used to receive a to-be-measured voltage and convert the to-be-measured voltage into a first conversion voltage according to a first target scaling factor.

[0058] In some embodiments, the first conversion device U3 is a transformer.

[0059] In some embodiments of the present application, please refer to Figure 1 The power measurement device of the present embodiment includes a second conversion device U4 for receiving the current to be measured and converting the current to be measured into a second conversion voltage according to a first target scaling factor.

[0060] In some embodiments, the second conversion device U4 is a current sensor.

[0061] Please refer to Figure 1 The power measurement device of the present embodiment includes a programmable power source U2, a high-stability clock U1, a PJVS quantum voltage synthesis device U7, a first conversion device U3, a second conversion device U4, a first switch K1A, a second switch K1B, a third switch K3A, a fourth switch K2A, a fifth switch K2B, a sixth switch K3B, a first analog-to-digital converter U8A, a second analog-to-digital converter U8B, a processor U5, and a human-computer interaction U6.

[0062] In some embodiments, the programmable power source U2 includes an XL803F three-phase programmable power source, or other 0.05-level three-phase programmable power source.

[0063] In some embodiments, the high-stability clock U1 uses a rubidium atomic clock or a clock with an accuracy better than 10 -10 .

[0064] In some embodiments, the PJVS quantum voltage synthesis device U7 includes a complete PJVS quantum voltage synthesis device composed of a microwave source, a multifunction industrial computer, a bias voltage, a quantum chip, quantum voltage generation control software, etc. The present application uses a NIM-QUANTUM-001 type alternating current sub-voltage synthesis device.

[0065] In some embodiments, the first converter uses a 2ppm (Parts Per Million) voltage ratio standard, and different specifications can be selected according to different input voltages, such as 100V to 1V and 220V to 1V.

[0066] In some embodiments, the second converter uses a precision resistor, and different specifications can be selected according to different input currents, such as 1A to 1V, 5A to 1V, 10A to 1V, and 100A to 1V.

[0067] Further, in order to better implement the power measurement device in any of the above embodiments, on the basis of the above power measurement device, please refer to Figure 3 , Figure 3A step schematic diagram of the power measurement method provided in the embodiment is shown in the figure; the application further provides a power measurement method, which is applied to the power measurement device as described above, and comprises the following steps:

[0068] S100: obtaining a first voltage difference value based on the standard quantum voltage and the first conversion voltage, or obtaining a second voltage difference value based on the standard quantum voltage and the second conversion voltage; specifically, the standard quantum voltage is a quantum voltage signal output by the PJVS, and the first voltage difference value and the second voltage difference value are measured by the first analog-to-digital converter U8A or the second analog-to-digital converter U8B.

[0069] S200: compensating the second sampling value of the second analog-to-digital converter U8B based on the first voltage difference value, or compensating the first sampling value of the first analog-to-digital converter U8A based on the second voltage difference value;

[0070] S300: obtaining the to-be-measured power based on the first sampling value and the second sampling value. Specifically, in the application, the first voltage difference value or the second voltage difference value is generated by setting one of the first analog-to-digital converter U8A or the second analog-to-digital converter U8B, and the first voltage difference value or the second voltage difference value is used to compensate the sampling value of the other of the first analog-to-digital converter U8A or the second analog-to-digital converter U8B, so as to realize continuous full sampling.

[0071] In some embodiments of the application, before obtaining the first voltage difference value based on the standard quantum voltage and the first conversion voltage, or obtaining the second voltage difference value based on the standard quantum voltage and the second conversion voltage, the power measurement method further comprises:

[0072] grounding the first switch K1A and the second switch K1B to perform zero static calibration on the first analog-to-digital converter U8A;

[0073] or, grounding the fourth switch K2A and the fifth switch K2B to perform zero static calibration on the second analog-to-digital converter U8B.

[0074] In some embodiments of the application, before obtaining the first voltage difference value based on the standard quantum voltage and the first conversion voltage, or obtaining the second voltage difference value based on the standard quantum voltage and the second conversion voltage, the power measurement method further comprises:

[0075] connecting the third switch K3A and the first switch K1A to the standard voltage source, and connecting the second switch K1B to the third switch K3A to perform initial value static calibration on the first analog-to-digital converter U8A;

[0076] or, connecting the sixth switch K3B and the fourth switch K2A to the standard voltage source, and connecting the fifth switch K2B to the sixth switch K3B to perform initial value static calibration on the second analog-to-digital converter U8B.

[0077] In some embodiments of the present application, the power measurement method further comprises:

[0078] detecting whether the power meter has pulse output;

[0079] If there is pulse output, calculating the error value of the power to be measured / the power to be measured based on the pulse output.

[0080] Specifically, the first analog-to-digital converter U8A and the second analog-to-digital converter U8B can be zero static calibrated by the following formula. Specifically, the DC offset voltage V offset，x of each channel needs to be calculated:

[0081] x: channel number, 1: sample 2: mirror, wherein the channel number x is 1, indicating the first analog-to-digital converter U8A and N: 50000

[0082] S i，x : sample value

[0083] The analog-to-digital converter U8B outputs the sample value, and the channel number x is 2, indicating the first analog-to-digital converter U8A and the second analog-to-digital converter U8B output the voltage difference value. N is the number of sampling points of one step in the standard quantum voltage. S i，x is the sample value.

[0084] The first analog-to-digital converter U8A and the second analog-to-digital converter U8B can be initially static calibrated by the following formula. Specifically, the mth step sample value VJM m，x in the standard quantum voltage needs to be calculated, and the calibration coefficient AJ m，x of each channel number needs to be calculated:

[0085] Specifically, in the compensation value acquisition step, the voltage difference value (dynamic compensation voltage VEm) can be calculated by the following formula:

[0086] Specifically, in the compensation step, the sample value can be compensated by the following formula: V i = (S 1,i -V offset,1 ) × AJ m,1 + VE m

[0087] m: the mth PJVS step

[0088] S m,1,i : original sampling value of the i-th point of sampling channel 1

[0089] AJ m,1 : calibration coefficient of sampling channel 1

[0090] VE m : compensation voltage in the m-th step measurement range

[0091] V offset，1： : offset compensation voltage of channel 1

[0092] V i : i-th point sampling value after dynamic compensation

[0093] In the above embodiments, the description of each embodiment has its own focus, and the part not described or recorded in a certain embodiment can be referred to the relevant description of other embodiments.

[0094] The above has described the basic concept, and it is obvious that the above detailed disclosure is only as an example and does not limit the present application for those skilled in the art. Although it is not explicitly stated here, those skilled in the art can make various modifications, improvements and corrections to the present application. Such modifications, improvements and corrections are suggested in the present application, so such modifications, improvements and corrections still belong to the spirit and scope of the exemplary embodiments of the present application.

[0095] At the same time, specific words are used in the present application to describe the embodiments of the present application. As "one embodiment", "an embodiment", and / or "some embodiments" means a certain feature, structure or characteristic related to at least one embodiment of the present application. Therefore, it should be emphasized and noted that the "an embodiment" or "one embodiment" or "one alternative embodiment" mentioned in different places in the specification twice or more does not necessarily refer to the same embodiment. In addition, some features, structures or characteristics in one or more embodiments of the present application can be properly combined.

[0096] Similarly, it should be noted that in order to simplify the expression of the disclosure of the present application and to help understand one or more embodiments of the present application, sometimes multiple features are combined into one embodiment, figure or description thereof in the foregoing description of the embodiments of the present application. However, this disclosure method does not mean that the features required by the present application are more than the features mentioned in the claims. In fact, the features of the embodiment are less than all the features of the disclosed single embodiment.

[0097] The above-described embodiments are only used to illustrate the technical solutions of the present application, but not limit them; although the present application is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application.

Claims

1. A power measuring device, characterized in that, include: A conversion module is used to acquire the voltage to be measured and the current to be measured, and to convert the voltage to be measured into a first conversion voltage and the current to be measured into a second conversion voltage; A standard voltage source, wherein the standard voltage source is an AC quantum voltage source and is used to generate a standard quantum voltage with a stepped waveform; A first analog-to-digital converter is configured to output a first sampled value based on the standard quantum voltage and the first conversion voltage; A second analog-to-digital converter (ADC) is configured to output a second sampled value based on the standard quantum voltage and the second conversion voltage; wherein, the first ADC is configured to obtain a first voltage difference based on the standard quantum voltage and the first conversion voltage, and the second ADC is configured to compensate for the second sampled value based on the first voltage difference; or the second ADC is configured to obtain a second voltage difference based on the standard quantum voltage and the second conversion voltage, and the first ADC is configured to compensate for the first sampled value based on the second voltage difference; A processor is configured to obtain the power to be measured based on the first sampled value and the second sampled value; The power measurement device further includes a first switch and a second switch. One end of the first switch is connected to the first analog-to-digital converter, and the other end of the first switch can be selectively connected to the standard voltage source or ground. One end of the second switch is connected to the first analog-to-digital converter, and the other end of the second switch can be selectively connected to the conversion module or ground. The first analog-to-digital converter is used to perform zero-position static calibration when the first switch and the second switch are grounded; The power measurement device further includes a third switch, one end of which is connected to the end of the conversion module connected to the second switch, and the other end of which can be selectively connected to the conversion module or to the standard voltage source; the first analog-to-digital converter is used to perform initial value static calibration when both the third switch and the first switch are connected to the standard voltage source and the second switch is connected to the third switch.

2. The power measuring device according to claim 1, characterized in that, The standard voltage source is a programmable Josephson quantum voltage source.

3. The power measuring device according to claim 1, characterized in that, The power measurement device further includes a fourth switch and a fifth switch. One end of the fourth switch is connected to the second analog-to-digital converter, and the other end can be selectively connected to the standard voltage source or ground. The second analog-to-digital converter is used to perform zero-point static calibration when the fourth switch and the fifth switch are grounded.

4. The power measuring device according to claim 3, characterized in that, The power measurement device further includes a sixth switch, one end of which is connected to the end of the conversion module connected to the fifth switch, and the other end of which can be selectively connected to the conversion module or to the standard voltage source; the second analog-to-digital converter is used to perform initial value static calibration when both the sixth switch and the fourth switch are connected to the standard voltage source and the fifth switch is connected to the fourth switch.

5. The power measuring device according to claim 1, characterized in that, The power measurement device includes a first conversion device, which is used to receive the voltage to be measured and convert the voltage to be measured into the first converted voltage according to a first target scaling factor. And / or, the power measurement device includes a second conversion device for receiving the current to be measured and converting the current to be measured into a second conversion voltage according to a first target scaling factor.

6. A power measurement method, characterized in that, The power measurement method is applied to the power measurement device as described in any one of claims 1 to 5, and the power measurement method includes the following steps: A first voltage difference is obtained based on the standard quantum voltage and the first conversion voltage; or a second voltage difference is obtained based on the standard quantum voltage and the second conversion voltage; The second sample value of the second analog-to-digital converter is compensated based on the first voltage difference; or the first sample value of the first analog-to-digital converter is compensated based on the second voltage difference. The power to be measured is obtained based on the first sampled value and the second sampled value.

7. The power measurement method according to claim 6, characterized in that, The power measurement device further includes a fourth switch and a fifth switch. One end of the fourth switch is connected to the second analog-to-digital converter, and the other end can be selectively connected to the standard voltage source or ground. The second analog-to-digital converter is used to perform zero-point static calibration when the fourth switch and the fifth switch are grounded. Before obtaining a first voltage difference based on a standard quantum voltage and the first conversion voltage; or before obtaining a second voltage difference based on the standard quantum voltage and the second conversion voltage, the power measurement method further includes: The first and second switching elements are grounded to perform zero-position static calibration on the first analog-to-digital converter; Alternatively, the fourth and fifth switches can be grounded to perform zero-position static calibration on the second analog-to-digital converter.

8. The power measurement method according to claim 6, characterized in that, The power measurement device further includes a fourth switch and a fifth switch. One end of the fourth switch is connected to the second analog-to-digital converter (ADC), and the other end can be selectively connected to the standard voltage source or grounded. The second ADC is used to perform zero-point static calibration when the fourth and fifth switches are grounded. The power measurement device further includes a sixth switch. One end of the sixth switch is connected to the end of the conversion module connected to the fifth switch, and the other end of the sixth switch can be selectively connected to the conversion module or connected to the standard voltage source. The second ADC is used to perform initial value static calibration when both the sixth and fourth switches are connected to the standard voltage source, and the fifth switch is connected to the fourth switch. Before obtaining a first voltage difference based on a standard quantum voltage and the first conversion voltage; or before obtaining a second voltage difference based on the standard quantum voltage and the second conversion voltage, the power measurement method further includes: Both the third switch and the first switch are connected to the standard voltage source, and the second switch is connected to the third switch, so as to perform initial static calibration on the first analog-to-digital converter; Alternatively, the sixth and fourth switches can be connected to the standard voltage source, and the fifth switch can be connected to the sixth switch to perform initial static calibration on the second analog-to-digital converter. Alternatively, the power measurement method may also include: Check if the electricity meter has a pulse output; If a pulse output exists, the error value of the power to be measured / energy to be measured is calculated based on the pulse output.

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