Wideband ac power measurement apparatus and method based on thermoelectric converter

Abstract

The application relates to the technical field of electric energy metering, in particular to a wide-frequency alternating-current power measuring device and method based on thermoelectric converters, wherein the device comprises a band-pass filter and a band-stop filter, and the fundamental wave voltage, the fundamental wave current, the harmonic wave voltage and the harmonic wave current are obtained based on the measured voltage signal and the measured current signal; the first adder and the second adder and the first subtractor and the second subtractor output the fundamental wave component and the harmonic wave component; the first to fifth thermoelectric converters perform electric-thermal conversion to obtain equivalent direct-current parameters corresponding to the fundamental wave component and the harmonic wave component; and the sampling microcontroller obtains the fundamental wave power, the harmonic wave power and the fundamental wave power factor. According to the application, the measurement of the fundamental wave power and the harmonic wave power can be realized based on the thermoelectric converters under the condition that the voltage and current signals have harmonics, the fundamental wave power factor is obtained, the range width of the frequency response is improved, the cost of the high-frequency power measurement is reduced, and the accuracy and the practicability are higher.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric energy metering, and particularly relates to a wideband AC power measuring device and method based on a thermoelectric transducer. BACKGROUND

[0002] With the continuous advancement of new power system construction such as ship power system, aircraft power system and electromagnetic scalpel, the wideband requirement of electric energy metering of the power system is also improved

[0003] In the related art, an electronic electric energy meter or a smart electric energy meter adopts a sampling method to realize electric energy metering, and the accuracy meets the electric energy trade settlement requirement in the frequency range of 0Hz-2.5kHz.

[0004] However, in the related art, the sampling method has narrow frequency adaptation range, low accuracy and cannot realize the distinction between fundamental power and harmonic power, cannot guarantee the wideband electric energy metering requirement, and has strong dependence on high-precision A / D conversion chips, which increases the manufacturing cost of the electric energy meter, and it is difficult to realize high-accuracy and low-cost high-frequency power measurement, and the practicability is insufficient, and it is urgent to be solved. SUMMARY

[0005] The present application provides a wideband AC power measuring device and method based on a thermoelectric transducer, to solve the problems in the related art that the sampling method has narrow frequency adaptation range, low accuracy and cannot realize the distinction between fundamental power and harmonic power, cannot guarantee the wideband electric energy metering requirement, and has strong dependence on high-precision A / D conversion chips, which increases the manufacturing cost of the electric energy meter, and it is difficult to realize high-accuracy and low-cost high-frequency power measurement, and the practicability is insufficient.

[0006] The first aspect of this application provides a broadband AC power measurement device based on a thermoelectric converter, comprising: a bandpass filter and a bandstop filter, one end of which is connected to a signal input terminal to obtain fundamental voltage, fundamental current, harmonic voltage, and harmonic current based on a measured voltage signal and a measured current signal; a first adder and a second adder, and a first subtractor and a second subtractor, the input terminals of which are connected to the other end of the bandpass filter, and the input terminals of which are connected to the other end of the bandstop filter to obtain fundamental voltage, fundamental current, harmonic voltage, and harmonic current based on the measured voltage signal and the measured current signal; and a first adder, a second adder, a first subtractor, and a second subtractor. The system outputs the fundamental and harmonic components; it also includes a first to a fifth thermoelectric converter, the inputs of which are connected to the outputs of the first adder, the first subtractor, the second adder, the second subtractor, and the other end of the bandpass filter, respectively, to perform electrothermal conversion on the fundamental and harmonic components to obtain equivalent DC parameters corresponding to the fundamental and harmonic components; and a sampling microcontroller, which is connected to the outputs of the first to fifth thermoelectric converters, and obtains the fundamental power, harmonic power, and fundamental power factor based on the equivalent DC parameters corresponding to the fundamental and harmonic components.

[0007] Optionally, in one embodiment of this application, the device further includes: a first to a fifth switch, the first to a fifth switch being respectively disposed between the input terminal of the first to fifth thermoelectric converter and the output terminal of the first adder, the output terminal of the first subtractor, the output terminal of the second adder, the output terminal of the second subtractor, and the other end of the bandpass filter.

[0008] Optionally, in one embodiment of this application, the sampling microcontroller is specifically used to close the first switch and the second switch to measure the fundamental power, close the fourth switch and the fifth switch to measure the harmonic power, and then close the third switch to measure the fundamental power factor.

[0009] Optionally, in one embodiment of this application, the formulas for calculating the fundamental power, the harmonic power, and the fundamental power factor are as follows:

[0010]

[0011]

[0012]

[0013] Where P1 is the fundamental power, S1 is the apparent power, and P hFor harmonic power, PF1 is fundamental power factor, U1, I1 are fundamental voltage, fundamental current effective value respectively, θ1 is fundamental voltage initial phase angle, φ1 is fundamental current initial phase angle, h is harmonic number, U h , I h are h times harmonic voltage and h times harmonic current effective value respectively, θ h is h times harmonic voltage initial phase angle, φ h is h times harmonic current initial phase angle, D 1+ , D 1- , D h+ , D h- , D i1 is DC signal parameter.

[0014] The second aspect embodiment of the application provides a kind of based on thermoelectric converter's wide frequency ac power measurement method, using above-mentioned based on thermoelectric converter's wide frequency ac power measurement device, comprising the following steps: based on the measured voltage signal and the measured current signal obtain the fundamental voltage, the fundamental current, the harmonic voltage and the harmonic current;According to the fundamental voltage, the fundamental current, the harmonic voltage and the harmonic current output the fundamental component and the harmonic component to the fundamental component and the harmonic component are carried out electrothermal conversion, obtain the corresponding equivalent DC parameter of fundamental component and harmonic component;Based on the corresponding equivalent DC parameter of fundamental component and harmonic component obtain the fundamental power and the harmonic power.

[0015] The third aspect of the present application provides a wideband AC power measurement device based on thermoelectric converters, comprising: a band-pass filter or a low-pass filter, one end of the band-pass filter or the low-pass filter being connected to a signal input end to obtain a fundamental voltage and a fundamental current based on a measured voltage signal and a measured current signal; a first adder and a second adder and a first subtractor and a second subtractor, input ends of the first adder and the first subtractor being connected to the other end of the band-pass filter or the low-pass filter, input ends of the second adder and the second subtractor being connected to the signal input end, to output an original signal and a corresponding fundamental component according to the fundamental voltage and the fundamental current; first to fifth thermoelectric converters, input ends of the first to fifth thermoelectric converters being connected to output ends of the first adder, the first subtractor, the second adder, the second subtractor and the other end of the band-pass filter or the low-pass filter respectively, to perform electro-thermal conversion on the original signal and the corresponding fundamental component to obtain an original signal total equivalent DC parameter and an equivalent DC parameter of the fundamental component; and a sampling microcontroller, the sampling microcontroller being connected to output ends of the first to fifth thermoelectric converters respectively, the sampling microcontroller being used to obtain a fundamental power and a harmonic power based on the original signal total equivalent DC parameter and the equivalent DC parameter of the fundamental component.

[0016] Optionally, in an embodiment of the present application, the device further comprises: first to fifth switches, the first to fifth switches being respectively arranged between input ends of the first to fifth thermoelectric converters and output ends of the first adder, the first subtractor, the second adder, the second subtractor and the other end of the band-pass filter or the low-pass filter.

[0017] Optionally, in an embodiment of the present application, the sampling microcontroller is specifically used to close the first switch and the second switch, measure the fundamental power, close the fourth switch and the fifth switch, measure the harmonic power, and close the third switch again to measure a fundamental power factor.

[0018] The fourth aspect of the present application provides a wideband AC power measurement method based on thermoelectric converters, which utilizes the above-mentioned wideband AC power measurement device based on thermoelectric converters, comprising the following steps: obtaining the fundamental voltage and the fundamental current based on the measured voltage signal and the measured current signal; outputting the original signal and the corresponding fundamental component according to the fundamental voltage and the fundamental current; performing electro-thermal conversion on the original signal and the corresponding fundamental component to obtain the original signal total equivalent DC parameter and the equivalent DC parameter of the fundamental component; and obtaining the fundamental power and the harmonic power based on the original signal total equivalent DC parameter and the equivalent DC parameter of the fundamental component.

[0019] The fifth aspect of the present application provides an electronic device, comprising a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the method for measuring wideband alternating current power based on thermoelectric converter as described in the above embodiments.

[0020] The sixth aspect of the present application provides a computer readable storage medium, which stores a computer program executable by a processor to implement the method for measuring wideband alternating current power based on thermoelectric converter as described above.

[0021] The embodiments of the present application can measure the fundamental power and harmonic power based on thermoelectric converter under the condition that there are harmonics in the voltage and current signals, and obtain the fundamental power factor, thereby improving the range width of frequency response, reducing the cost of high-frequency power measurement, and improving the accuracy and practicability. Thus, the problems in the related art that the frequency adaptation range of power measurement and energy measurement by sampling method is narrow, the accuracy is low, the fundamental power and harmonic power cannot be distinguished, the wideband energy measurement requirement cannot be guaranteed, the dependence on high-precision A / D conversion chip is strong, the manufacturing cost of the electric energy meter is increased, the high-accuracy and low-cost high-frequency power measurement is difficult to achieve, and the practicability is insufficient, etc. are solved.

[0022] Additional aspects and advantages of the present application will be made apparent by the following description and the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0023] The above and / or additional aspects and advantages of the present application will become apparent and be readily appreciated from the following description, including the accompanying drawings, wherein:

[0024] Figure 1 FIG. 1 is a structural schematic diagram of a wideband alternating current power measurement device based on thermoelectric converter according to an embodiment of the present application;

[0025] Figure 2 FIG. 2 is a connection schematic diagram of a wideband alternating current power measurement device based on thermoelectric converter according to an embodiment of the present application;

[0026] Figure 3 FIG. 3 is a flowchart of a method for measuring wideband alternating current power based on thermoelectric converter according to an embodiment of the present application;

[0027] Figure 4 FIG. 4 is a structural schematic diagram of another wideband alternating current power measurement device based on thermoelectric converter according to an embodiment of the present application;

[0028] Figure 5This is a connection diagram of another broadband AC power measuring device based on a thermoelectric converter according to an embodiment of this application;

[0029] Figure 6 This is a flowchart of another broadband AC power measurement method based on a thermoelectric converter provided according to an embodiment of this application;

[0030] Figure 7 This is a schematic diagram of the structure of an electronic device according to an embodiment of this application. Detailed Implementation

[0031] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.

[0032] The following description, with reference to the accompanying drawings, describes a broadband AC power measurement device and method based on a thermoelectric converter according to embodiments of this application. Addressing the issues raised in the background section regarding the narrow frequency range, low accuracy, and failure to distinguish between fundamental and harmonic power in sampling methods for power and energy measurement, this application provides a broadband AC power measurement device based on a thermoelectric converter. This device can measure fundamental and harmonic power under harmonic conditions in voltage and current signals, obtaining the fundamental power factor. This improves the frequency response range, reduces the cost of high-frequency power measurement, and enhances accuracy and practicality. This solves the problems in related technologies, such as the narrow frequency range of power and energy measurement using sampling methods, low accuracy, failure to distinguish between fundamental and harmonic power, inability to guarantee wide-band power metering requirements, strong dependence on high-precision A / D conversion chips, increased manufacturing costs of energy meters, difficulty in achieving high-accuracy and low-cost high-frequency power measurement, and insufficient practicality.

[0033] Specifically, Figure 1 This is a schematic diagram of a broadband AC power measurement device based on a thermoelectric converter, provided in an embodiment of this application.

[0034] like Figure 1 As shown, the broadband AC power measurement device 10 based on a thermoelectric converter includes:

[0035] The bandpass filter 110 and the bandstop filter 120 are connected at one end to the signal input terminal 11 to obtain the fundamental voltage, fundamental current, harmonic voltage and harmonic current based on the measured voltage signal and the measured current signal.

[0036] Specifically, such as Figure 2 The diagram shows a connection schematic of a broadband AC power measurement device based on a thermoelectric converter according to an embodiment of this application. Both the bandpass filter (BPF) 110 and the bandstop filter (BSF) 120 are connected to the measured voltage and current signal terminals of the signal input terminal 11 to separate the fundamental and harmonic components in the input signal. The fundamental voltage u1 and fundamental current i1 are obtained by the bandpass filter 110, and the harmonic voltage u1 is obtained by the bandstop filter 120. h Harmonic current i h .

[0037] Both filters in this embodiment are connected to the input signal. By filtering and weakening the input signal, the fundamental voltage, fundamental current, harmonic voltage, and harmonic current are extracted and separated, thereby performing further analysis and calculation based on the processed signal.

[0038] The first adder 211, the second adder 212, the first subtractor 221, and the second subtractor 222 are connected to the other end of the bandpass filter 110, and the inputs of the second adder 212 and the second subtractor 222 are connected to the other end of the bandstop filter 120, so as to output the fundamental component and harmonic component according to the fundamental voltage, fundamental current, harmonic voltage, and harmonic current.

[0039] It is understood that, in the embodiments of this application, the input terminals of the first adder 211 and the first subtractor 221 obtain the fundamental voltage and fundamental current from the bandpass filter 110, and the input terminals of the second adder 212 and the second subtractor 222 obtain the harmonic voltage and harmonic current from the bandstop filter 120, so as to obtain the sum and difference results of the fundamental voltage and fundamental current, and the sum and difference results of the harmonic voltage and harmonic current, respectively.

[0040] In actual implementation, such as Figure 2 As shown, sum and difference operations can be performed using the first adder A211, the first subtractor B221, the second adder C212, and the second subtractor D222, with the output signals being S in sequence. A =u1+i1,S B =u1-i1,S C =u h +i h and SD =u h -i h .

[0041] The first to fifth thermoelectric converters are connected to the outputs of the first adder 211, the first subtractor 221, the second adder 212, the second subtractor 222, and the other end of the bandpass filter 110, respectively, to perform electrothermal conversion on the fundamental and harmonic components to obtain equivalent DC parameters corresponding to the fundamental and harmonic components.

[0042] In actual implementation, such as Figure 2 As shown, the signal S obtained by the first adder A211, the first subtractor B221, the second adder C212, and the second subtractor D222 is... A S B S C S D The fundamental current i1 can be directly fed into thermoelectric converter TC5 350 for thermoelectric conversion, respectively, while the fundamental current i1 can be directly fed into thermoelectric converter TC5 350 for thermoelectric conversion.

[0043] Specifically, in one embodiment of this application, the device 10 further includes: a first to a fifth switch, which are respectively disposed between the input terminals of the first to fifth thermoelectric converters and the output terminals of the first adder 211, the first subtractor 221, the second adder 212, the second subtractor 222, and the other end of the bandpass filter 110.

[0044] It is understood that, in the embodiments of this application, the first switch is used to control the closing and opening of the connection between the first adder 211 and the first thermoelectric converter 310, the second switch is used to control the closing and opening of the connection between the second subtractor 222 and the second thermoelectric converter 320, the third switch is used to control the closing and opening of the connection between the third adder and the third thermoelectric converter 330, the fourth switch is used to control the closing and opening of the connection between the fourth subtractor and the fourth thermoelectric converter 340, and the fifth switch is used to control the closing and opening of the connection between the bandpass filter 110 and the fifth thermoelectric converter 350.

[0045] The sampling microcontroller 400 is connected to the output terminals of the first to fifth thermoelectric converters respectively. The sampling microcontroller 400 obtains the fundamental power, harmonic power and fundamental power factor based on the equivalent DC parameters corresponding to the fundamental component and harmonic component.

[0046] It is understood that, in this embodiment of the application, the sampling microcontroller 400 can obtain the DC signal parameters obtained from the first to fifth thermoelectric converters and perform calculations to obtain the fundamental power P1 and harmonic power P2. h By combining the fundamental power factor PF1 with the obtained power and performing corresponding time integration, the corresponding power metering calculation results can be obtained, enabling high-frequency power measurement in the frequency range of 1kHz to 1MHz.

[0047] Furthermore, in one embodiment of this application, the sampling microcontroller 400 is specifically used to close the first switch and the second switch to measure the fundamental power, close the fourth switch and the fifth switch to measure the harmonic power, and then close the third switch to measure the fundamental power factor.

[0048] In actual implementation, such as Figure 2 As shown, the fundamental power can be measured by closing switches S1 and S2 and opening the remaining switches, the harmonic power can be measured by closing switches S3 and S4 and opening the remaining switches, and the fundamental power factor can be measured by closing switch S5 and opening the remaining switches.

[0049] Optionally, in one embodiment of this application, the formulas for calculating the fundamental power, harmonic power, and fundamental power factor are as follows:

[0050]

[0051]

[0052]

[0053] Where P1 is the fundamental power, S1 is the apparent power, and P h PF1 is the fundamental power factor, U1 and I1 are the effective values ​​of the fundamental voltage and current, respectively, θ1 is the initial phase angle of the fundamental voltage, φ1 is the initial phase angle of the fundamental current, h is the harmonic order, and U... h I h These are the effective values ​​of the h-th harmonic voltage and h-th harmonic current, respectively, and θ h It is the initial phase angle of the h-th harmonic voltage, φ h It is the initial phase angle of the h-th harmonic current, D 1+ D 1- D h+ D h- D i1 These are DC signal parameters.

[0054] Specifically, the first thermoelectric converter TC1 310 can convert DC signal D 1+ Power and signal S A Active power (one fundamental cycle) The comparison is performed within the internal part, that is:

[0055]

[0056] Similarly, for thermoelectric converters TC2 320, TC3 330, TC4 340, and TC5 350, we can obtain the following respectively:

[0057]

[0058]

[0059]

[0060]

[0061] Furthermore, the root-mean-square value of the fundamental voltage component u1 can be obtained:

[0062]

[0063] Finally, the fundamental power P1 and harmonic power P can be obtained. h and fundamental power factor PF1:

[0064]

[0065]

[0066]

[0067] Where P1 is the fundamental power, S1 is the apparent power, and P h PF1 is the fundamental power factor, U1 and I1 are the effective values ​​of the fundamental voltage and current, respectively, θ1 is the initial phase angle of the fundamental voltage, φ1 is the initial phase angle of the fundamental current, h is the harmonic order, and U... h I h These are the effective values ​​of the h-th harmonic voltage and h-th harmonic current, respectively, and θ h It is the initial phase angle of the h-th harmonic voltage, φ h It is the initial phase angle of the h-th harmonic current, D 1+ D 1- D h+ D h- D i1 These are DC signal parameters.

[0068] The broadband AC power measurement device based on a thermoelectric converter proposed in this application can measure the fundamental power and harmonic power under harmonic conditions in voltage and current signals, thereby obtaining the fundamental power factor. This improves the frequency response range, reduces the cost of high-frequency power measurement, and enhances accuracy and practicality. Therefore, it solves the problems in related technologies, such as the narrow frequency range of power and energy measurement calculated by sampling methods, low accuracy, failure to distinguish between fundamental and harmonic power, inability to guarantee broadband energy metering requirements, strong dependence on high-precision A / D conversion chips, increased manufacturing costs of energy meters, difficulty in achieving high-accuracy and low-cost high-frequency power measurement, and insufficient practicality.

[0069] Next, with reference to the accompanying drawings, a broadband AC power measurement method based on a thermoelectric converter, according to an embodiment of this application, is described.

[0070] Figure 3 This is a flowchart of a broadband AC power measurement method based on a thermoelectric converter according to an embodiment of this application, including the following steps:

[0071] In step S301, the fundamental voltage, fundamental current, harmonic voltage, and harmonic current are obtained based on the measured voltage signal and the measured current signal.

[0072] In step S302, the fundamental component and harmonic component are output based on the fundamental voltage, fundamental current, harmonic voltage, and harmonic current.

[0073] In step S303, the fundamental component and harmonic components are electrothermally converted to obtain equivalent DC parameters corresponding to the fundamental component and harmonic components.

[0074] In step S304, the fundamental power and harmonic power are obtained based on the equivalent DC parameters corresponding to the fundamental component and harmonic components.

[0075] It should be noted that the foregoing explanation of the embodiment of the broadband AC power measurement method based on thermoelectric converter also applies to the broadband AC power measurement device based on thermoelectric converter in this embodiment, and will not be repeated here.

[0076] The broadband AC power measurement method based on thermoelectric converters proposed in this application can measure the fundamental power and harmonic power under harmonic conditions in voltage and current signals, thereby obtaining the fundamental power factor. This improves the frequency response range, reduces the cost of high-frequency power measurement, and enhances accuracy and practicality. Therefore, it solves the problems of related technologies, such as the narrow frequency range of power and energy measurement calculated by sampling methods, low accuracy, failure to distinguish between fundamental and harmonic power, inability to guarantee broadband energy metering requirements, strong dependence on high-precision A / D conversion chips, increased manufacturing costs of energy meters, difficulty in achieving high-accuracy and low-cost high-frequency power measurement, and insufficient practicality.

[0077] Figure 4 This is a schematic diagram of another broadband AC power measurement device based on a thermoelectric converter provided in an embodiment of this application.

[0078] like Figure 4 As shown, the broadband AC power measurement device 20 based on a thermoelectric converter includes:

[0079] A bandpass filter or a low-pass filter, one end of which is connected to the signal input terminal 11, is used to obtain the fundamental voltage and fundamental current based on the measured voltage signal and the measured current signal.

[0080] Specifically, such as Figure 5 The diagram shows a connection schematic of another broadband AC power measurement device based on a thermoelectric converter according to an embodiment of this application. A bandpass filter (BPF) or a low-pass filter 110 is connected to the voltage and current signal terminals of the signal input terminal 11 to obtain the fundamental component in the input signal and acquire the fundamental voltage u1 and the fundamental current i1.

[0081] In this application embodiment, the filters are all connected to the input signal. By filtering and weakening the input signal, the fundamental voltage and fundamental current are extracted and separated, thereby performing further analysis and calculation based on the processed signal.

[0082] The first adder 211, the second adder 212, the first subtractor 221, and the second subtractor 222 are connected to the other end of the bandpass filter or the lowpass filter 110. The input terminals of the second adder 212 and the second subtractor 221 are connected to the signal input terminal 11 to output the original signal and the corresponding fundamental component according to the fundamental voltage and fundamental current.

[0083] It is understood that in the embodiments of this application, the input terminals of the first adder 211 and the first subtractor 221 obtain the fundamental voltage and fundamental current from the bandpass filter or low-pass filter 110, and the input terminals of the second adder 212 and the second subtractor 222 obtain the original signal voltage and original signal current from the signal input terminal 11, so as to obtain the sum and difference results of the fundamental voltage and fundamental current, and the sum and difference results of the original signal voltage and original signal current, respectively.

[0084] In actual implementation, such as Figure 5 As shown, sum and difference operations can be performed using the first adder A211, the first subtractor B221, the second adder C212, and the second subtractor D222, with the output signals being S in sequence. A =u1+i1,S B =u1-i1,S C =u+i and S D =ui.

[0085] The first to fifth thermoelectric converters have their input terminals connected to the output terminals of the first adder 211, the first subtractor 221, the second adder 212, the second subtractor 222, and the other end of the bandpass filter or lowpass filter 110, respectively, to perform electrothermal conversion on the original signal and the corresponding fundamental component, thereby obtaining the total equivalent DC parameter of the original signal and the equivalent DC parameter of the fundamental component.

[0086] In actual implementation, such as Figure 5 As shown, the signal S obtained by the first adder A211, the first subtractor B221, the second adder C212, and the second subtractor D222 is... A S B S C S D The fundamental current i1 can be directly fed into thermoelectric converter TC5 350 for thermoelectric conversion, respectively, while the fundamental current i1 can be directly fed into thermoelectric converter TC5 350 for thermoelectric conversion.

[0087] Specifically, in one embodiment of this application, the device further includes: a first to a fifth switch, which are respectively disposed between the input terminal of the first to fifth thermoelectric converter and the output terminal of the adder 211, the output terminal of the first subtractor 221, the output terminal of the second adder 212, the output terminal of the second subtractor 222, and the other end of the bandpass filter or lowpass filter 110.

[0088] It is understood that, in the embodiments of this application, the first switch is used to control the closing and opening of the connection between the first adder 211 and the first thermoelectric converter 310, the second switch is used to control the closing and opening of the connection between the second subtractor 222 and the second thermoelectric converter 320, the third switch is used to control the closing and opening of the connection between the third adder and the third thermoelectric converter 330, the fourth switch is used to control the closing and opening of the connection between the fourth subtractor and the fourth thermoelectric converter 340, and the fifth switch is used to control the closing and opening of the connection between the bandpass filter or lowpass filter 110 and the fifth thermoelectric converter 350.

[0089] The sampling microcontroller 400 is connected to the output terminals of the first to fifth thermoelectric converters respectively. The sampling microcontroller 400 obtains the fundamental power and harmonic power based on the total equivalent DC parameter of the original signal and the equivalent DC parameter of the fundamental component.

[0090] It is understood that, in this embodiment of the application, the sampling microcontroller 400 can obtain the DC signal parameters obtained from the first to fifth thermoelectric converters and perform calculations to obtain the fundamental power P1 and harmonic power P2. h By combining the fundamental power factor PF1 with the obtained power and performing corresponding time integration, the corresponding electricity metering calculation results can be obtained. Among these, the harmonic power P... h The total power P can be calculated first. t Then subtract the fundamental power P1 to obtain the harmonic power P. h .

[0091] Furthermore, in one embodiment of this application, the sampling microcontroller 400 is specifically used to close the first switch and the second switch to measure the fundamental power, close the fourth switch and the fifth switch to measure the harmonic power, and then close the third switch to measure the fundamental power factor.

[0092] In actual implementation, such as Figure 5 As shown, the fundamental power can be measured by closing switches S1 and S2 and opening the remaining switches, the total power of the original signal can be measured by closing switches S3 and S4 and opening the remaining switches, and then the harmonic power can be obtained. The fundamental power factor can be measured by closing switch S5 and opening the remaining switches.

[0093] The broadband AC power measurement device based on a thermoelectric converter proposed in this application can measure the fundamental power and harmonic power under harmonic conditions in voltage and current signals, thereby obtaining the fundamental power factor. This improves the frequency response range, reduces the cost of high-frequency power measurement, and enhances accuracy and practicality. Therefore, it solves the problems in related technologies, such as the narrow frequency range of power and energy measurement calculated by sampling methods, low accuracy, failure to distinguish between fundamental and harmonic power, inability to guarantee broadband energy metering requirements, strong dependence on high-precision A / D conversion chips, increased manufacturing costs of energy meters, difficulty in achieving high-accuracy and low-cost high-frequency power measurement, and insufficient practicality.

[0094] Next, with reference to the accompanying drawings, a broadband AC power measurement method based on a thermoelectric converter, according to an embodiment of this application, is described.

[0095] Figure 6 This is a flowchart of a broadband AC power measurement method based on a thermoelectric converter according to an embodiment of this application, including the following steps:

[0096] In step S601, the fundamental voltage and fundamental current are obtained based on the measured voltage signal and the measured current signal.

[0097] In step S602, the original signal and the corresponding fundamental component are output according to the fundamental voltage and fundamental current.

[0098] In step S603, the original signal and the corresponding fundamental component are electrothermal converted to obtain the total equivalent DC parameter of the original signal and the equivalent DC parameter of the fundamental component.

[0099] In step S604, the fundamental power and harmonic power are obtained based on the total equivalent DC parameters of the original signal and the equivalent DC parameters of the fundamental component.

[0100] It should be noted that the foregoing explanation of the embodiment of the broadband AC power measurement method based on thermoelectric converter also applies to the broadband AC power measurement device based on thermoelectric converter in this embodiment, and will not be repeated here.

[0101] The broadband AC power measurement method based on thermoelectric converters proposed in this application can measure the fundamental power and harmonic power under harmonic conditions in voltage and current signals, thereby obtaining the fundamental power factor. This improves the frequency response range, reduces the cost of high-frequency power measurement, and enhances accuracy and practicality. Therefore, it solves the problems in related technologies, such as the narrow frequency range of power and energy measurement calculated by sampling methods, low accuracy, failure to distinguish between fundamental and harmonic power, inability to guarantee broadband energy metering requirements, strong dependence on high-precision A / D conversion chips, increased manufacturing costs of energy meters, difficulty in achieving high-accuracy and low-cost high-frequency power measurement, and insufficient practicality.

[0102] Figure 7 A schematic diagram of the structure of an electronic device provided in an embodiment of this application. The electronic device may include:

[0103] The memory 701, the processor 702, and the computer program stored on the memory 701 and executable on the processor 702.

[0104] When the processor 702 executes the program, it implements the wideband AC power measurement method based on thermoelectric converter provided in the above embodiments.

[0105] Furthermore, electronic devices also include:

[0106] Communication interface 703 is used for communication between memory 701 and processor 702.

[0107] The memory 701 is used to store computer programs that can run on the processor 702.

[0108] The memory 701 may include high-speed RAM memory, and may also include non-volatile memory, such as at least one disk storage device.

[0109] If the memory 701, processor 702, and communication interface 703 are implemented independently, then the communication interface 703, memory 701, and processor 702 can be interconnected via a bus to complete communication between them. The bus can be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, or an Extended Industry Standard Architecture (EISA) bus, etc. Buses can be categorized as address buses, data buses, control buses, etc. For ease of representation, Figure 7The bus is represented by a single thick line, but this does not mean that there is only one bus or one type of bus.

[0110] Optionally, in a specific implementation, if the memory 701, processor 702, and communication interface 703 are integrated on a single chip, then the memory 701, processor 702, and communication interface 703 can communicate with each other through an internal interface.

[0111] The processor 702 may be a central processing unit (CPU), an application specific integrated circuit (ASIC), or one or more integrated circuits configured to implement the embodiments of this application.

[0112] This embodiment also provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the above-described broadband AC power measurement method based on a thermoelectric converter.

[0113] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0114] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "N" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0115] Any process or method described in the flowchart or otherwise herein can be understood as representing a module, segment, or portion of code comprising one or N executable instructions for implementing custom logic functions or processes, and the scope of the preferred embodiments of this application includes additional implementations in which functions may be performed not in the order shown or discussed, including substantially simultaneously or in reverse order depending on the functions involved, as should be understood by those skilled in the art to which embodiments of this application pertain.

[0116] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by, or in conjunction with, an instruction execution means, apparatus, or device (such as a computer-based device, a processor-included device, or other means that can fetch and execute instructions from, or in conjunction with, an instruction execution means, apparatus, or device). For the purposes of this specification, "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transmit programs for use by, or in conjunction with, an instruction execution means, apparatus, or device. More specific examples (a non-exhaustive list) of computer-readable media include: an electrical connection having one or more wires (electronic device), a portable computer disk drive (magnetic device), random access memory (RAM), read-only memory (ROM), erasable and programmable read-only memory (EPROM or flash memory), fiber optic devices, and portable optical disc read-only memory (CDROM). Alternatively, the computer-readable medium may be paper or other suitable media on which the program can be printed, since the program can be obtained electronically by optically scanning the paper or other medium, followed by editing, interpreting, or otherwise processing as necessary, and then stored in a computer memory.

[0117] It should be understood that the various parts of this application can be implemented using hardware, software, firmware, or a combination thereof. In the above embodiments, the N steps or methods can be implemented using software or firmware stored in memory and executed by a suitable instruction execution device. For example, if implemented in hardware as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0118] Those skilled in the art will understand that all or part of the steps of the methods in the above embodiments can be implemented by a program instructing related hardware. The program can be stored in a computer-readable storage medium, and when executed, the program includes one or a combination of the steps of the method embodiments.

[0119] Furthermore, the functional units in the various embodiments of this application can be integrated into a processing module, or each unit can exist physically separately, or two or more units can be integrated into a module. The integrated module can be implemented in hardware or as a software functional module. If the integrated module is implemented as a software functional module and sold or used as an independent product, it can also be stored in a computer-readable storage medium.

[0120] The storage medium mentioned above can be a read-only memory, a disk, or an optical disk, etc. Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of this application.

Claims

1. A wideband AC power measuring device based on a thermoelectric converter, characterized by The device comprises: a band-pass filter and a band-stop filter, one end of each of the band-pass filter and the band-stop filter being connected to a signal input end to obtain a fundamental wave voltage, a fundamental wave current, a harmonic wave voltage and a harmonic wave current based on a measured voltage signal and a measured current signal; a first adder and a second adder and a first subtractor and a second subtractor, an input end of the first adder and the first subtractor being connected to the other end of the band-pass filter, and an input end of the second adder and the second subtractor being connected to the other end of the band-stop filter to output a fundamental wave component and a harmonic wave component according to the fundamental wave voltage, the fundamental wave current, the harmonic wave voltage and the harmonic wave current; first to fifth thermoelectric converters, input ends of the first to fifth thermoelectric converters being connected to an output end of the first adder, an output end of the first subtractor, an output end of the second adder, an output end of the second subtractor and the other end of the band-pass filter respectively to perform electro-thermal conversion on the fundamental wave component and the harmonic wave component to obtain equivalent direct current parameters corresponding to the fundamental wave component and the harmonic wave component; and a sampling microcontroller, output ends of the first to fifth thermoelectric converters being connected to the sampling microcontroller, the sampling microcontroller obtaining a fundamental wave power, a harmonic wave power and a fundamental wave power factor based on the equivalent direct current parameters corresponding to the fundamental wave component and the harmonic wave component.

2. The thermoelectric converter-based wideband ac power measurement device of claim 1, wherein, The device further comprises: first to fifth switches, the first to fifth switches being arranged between the input ends of the first to fifth thermoelectric converters and the output end of the first adder, the output end of the first subtractor, the output end of the second adder, the output end of the second subtractor and the other end of the band-pass filter respectively.

3. The thermoelectric converter-based wideband ac power measurement device of claim 2, wherein, The sampling microcontroller is specifically used for closing the first switch and the second switch, measuring the fundamental wave power, closing the fourth switch and the fifth switch, measuring the harmonic wave power, and closing the third switch again to measure the fundamental wave power factor.

4. The thermoelectric converter-based wideband ac power measurement device of claim 3, wherein, The calculation formulae of the fundamental wave power, the harmonic wave power and the fundamental wave power factor are: Wherein, P1 is the fundamental power, S1 is the apparent power, P h is the harmonic power, PF1 is the fundamental power factor, U1, I1 are the fundamental voltage, fundamental current effective value respectively, θ1 is the fundamental voltage initial phase angle, φ1 is the fundamental current initial phase angle, h is the harmonic number, U h , I h are the h harmonic voltage and h harmonic current effective value respectively, θ h is the h harmonic voltage initial phase angle, φ h is the h harmonic current initial phase angle, D 1+ , D 1- , D h+ , D h- , D i1 is the DC signal parameter.

5. A method of measuring wideband ac power based on a thermoelectric converter, characterized by, The device for measuring wide-frequency alternating current power based on thermoelectric converters comprises: a band-pass filter and a band-stop filter, one end of each of the band-pass filter and the band-stop filter being connected to a signal input end to obtain a fundamental wave voltage, a fundamental wave current, a harmonic wave voltage and a harmonic wave current based on a measured voltage signal and a measured current signal; a first adder and a second adder and a first subtractor and a second subtractor, an input end of the first adder and the first subtractor being connected to the other end of the band-pass filter, and an input end of the second adder and the second subtractor being connected to the other end of the band-stop filter to output a fundamental wave component and a harmonic wave component according to the fundamental wave voltage, the fundamental wave current, the harmonic wave voltage and the harmonic wave current; first to fifth thermoelectric converters, input ends of the first to fifth thermoelectric converters being connected to an output end of the first adder, an output end of the first subtractor, an output end of the second adder, an output end of the second subtractor and the other end of the band-pass filter respectively to perform electro-thermal conversion on the fundamental wave component and the harmonic wave component to obtain equivalent direct current parameters corresponding to the fundamental wave component and the harmonic wave component; and 6. A wideband AC power measuring device based on a thermoelectric converter, characterized by a sampling microcontroller, output ends of the first to fifth thermoelectric converters being connected to the sampling microcontroller, the sampling microcontroller obtaining a fundamental wave power, a harmonic wave power and a fundamental wave power factor based on the equivalent direct current parameters corresponding to the fundamental wave component and the harmonic wave component. The device further comprises: first to fifth switches, the first to fifth switches being arranged between the input ends of the first to fifth thermoelectric converters and the output end of the first adder, the output end of the first subtractor, the output end of the second adder, the output end of the second subtractor and the other end of the band-pass filter respectively. The sampling microcontroller is specifically used for closing the first switch and the second switch, measuring the fundamental wave power, closing the fourth switch and the fifth switch, measuring the harmonic wave power, and closing the third switch again to measure the fundamental wave power factor. The calculation formulae of the fundamental wave power, the harmonic wave power and the fundamental wave power factor are: The device for measuring wide-frequency alternating current power based on thermoelectric converters comprises: a band-pass filter or a low-pass filter, one end of the band-pass filter or the low-pass filter being connected to a signal input end to obtain a fundamental wave voltage and a fundamental wave current based on a measured voltage signal and a measured current signal; a first adder and a second adder and a first subtractor and a second subtractor, inputs of the first adder and the first subtractor are connected with the other end of the band-pass filter or the low-pass filter, inputs of the second adder and the second subtractor are connected with the signal input end, to output original signal and corresponding fundamental component according to the fundamental voltage and the fundamental current; first to fifth thermoelectric converters, inputs of the first to fifth thermoelectric converters are connected with the output of the first adder, the output of the first subtractor, the output of the second adder, the output of the second subtractor and the other end of the band-pass filter or the low-pass filter respectively, to perform electric-thermal conversion on the original signal and the corresponding fundamental component, to obtain original signal total equivalent DC quantity and equivalent DC quantity of the fundamental component; a sampling microcontroller, connected with the outputs of the first to fifth thermoelectric converters respectively, the sampling microcontroller obtains fundamental power and harmonic power based on the original signal total equivalent DC quantity and the equivalent DC quantity of the fundamental component.

7. The thermoelectric converter-based wideband ac power measurement device of claim 6, wherein, Further comprising: first to fifth switches, arranged between the inputs of the first to fifth thermoelectric converters and the output of the first adder, the output of the first subtractor, the output of the second adder, the output of the second subtractor and the other end of the band-pass filter or the low-pass filter respectively.

8. The thermoelectric converter-based wideband ac power measurement device of claim 7, wherein, The sampling microcontroller is specifically used for closing the first switch and the second switch, measuring the fundamental power, closing the fourth switch and the fifth switch, measuring the harmonic power, and closing the third switch again, measuring the fundamental power factor.

9. A method of measuring wideband ac power based on a thermoelectric converter, characterized by, The thermoelectric converter-based wide-frequency AC power measurement device according to any one of claims 6-8, wherein the method comprises the following steps: obtaining the fundamental voltage and the fundamental current based on the measured voltage signal and the measured current signal; outputting the original signal and the corresponding fundamental component according to the fundamental voltage and the fundamental current; performing electric-thermal conversion on the original signal and the corresponding fundamental component, to obtain the original signal total equivalent DC quantity and the equivalent DC quantity of the fundamental component; obtaining the fundamental power and the harmonic power based on the original signal total equivalent DC quantity and the equivalent DC quantity of the fundamental component.

10. An electronic device, comprising: Comprise: a memory, a processor and a computer program stored on the memory and executable on the processor, the processor executes the program to implement the thermoelectric converter-based wide-frequency AC power measurement method according to claim 5 or 9.

11. A computer readable storage medium having stored thereon a computer program, characterized in that The program is executed by the processor to implement the thermoelectric converter-based wide-frequency AC power measurement method according to claim 5 or 9.

Images