CN107515332B - Direct current electric energy metering device and method based on frequency spectrum analysis and synchronous sampling - Google Patents
Direct current electric energy metering device and method based on frequency spectrum analysis and synchronous sampling Download PDFInfo
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- 238000005070 sampling Methods 0.000 title claims abstract description 226
- 238000010183 spectrum analysis Methods 0.000 title claims abstract description 37
- 238000000034 method Methods 0.000 title claims abstract description 26
- 230000001360 synchronised effect Effects 0.000 title claims abstract description 17
- 238000012545 processing Methods 0.000 claims abstract description 13
- 238000004364 calculation method Methods 0.000 claims description 21
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R22/00—Arrangements for measuring time integral of electric power or current, e.g. electricity meters
- G01R22/06—Arrangements for measuring time integral of electric power or current, e.g. electricity meters by electronic methods
Abstract
The invention discloses a direct current electric energy metering device and a method based on frequency spectrum analysis and synchronous sampling, wherein the device comprises a direct current voltage sampling module for sampling direct current voltage; the direct current sampling module is used for sampling direct current; the frequency and phase synchronization module is used for enabling the sampling frequency and the phase of the direct current voltage sampling and the sampling frequency and the phase of the direct current sampling to be the same; a frequency analysis module for processing the sampled signal using a fourier transform; the direct current electric energy calculating module is used for calculating direct current electric energy; the ripple electric energy calculating module is used for calculating ripple electric energy; the method comprises the steps of adjusting phase frequency synchronization of direct current sampling and direct voltage sampling, sampling direct current and direct voltage, and calculating after performing Fourier transform processing on a direct current sampling value and a direct voltage sampling value respectively to obtain direct current electric energy.
Description
Technical Field
The invention relates to the field of electric energy metering, in particular to a direct current electric energy metering device and method based on frequency spectrum analysis and synchronous sampling.
Background
The application range of the direct current electric energy is increasingly wide, and the direct current electric energy is required to be measured in the application occasions of electric automobile off-board charging, photovoltaic power generation and the like. The conventional method for measuring the direct current energy is to sample the direct current voltage and the direct current respectively, then multiply the samples directly and integrate the samples with time. When the direct current electric energy is in a steady state, the method can obtain an accurate result, but the direct current electric energy is usually dynamic, when the direct current electric energy is in a dynamic state, because the direct current voltage and the direct current possibly contain dynamic phenomena such as ripples and the like, a direct current power value obtained by directly multiplying sampling values is the sum of full wave and ripple power, the fact that whether the ripples are sent or absorbed by a metered user cannot be distinguished, and metering errors exist; secondly, if the sampling of the direct current voltage and the direct current is asynchronous, the voltage and current values will deviate during power calculation. Therefore, the conventional direct current electric energy metering method cannot meet the requirements, and a calculation method of dynamic direct current electric energy needs to be designed.
Disclosure of Invention
In order to solve the problem of metering error of dynamic direct current energy in the background art, the invention provides a direct current energy metering device and a direct current energy metering method based on frequency spectrum analysis and synchronous sampling.
A direct current power metering device based on spectral analysis and synchronous sampling, the device comprising:
the direct current sampling module is used for sampling direct current, and comprises a signal receiving unit which is used for adjusting the frequency and the phase of direct current sampling according to received frequency and phase signals; the output end of the direct current sampling module is connected with the input end of the frequency spectrum analysis module;
the direct current voltage sampling module is used for sampling direct current voltage, and comprises a signal receiving unit which is used for adjusting the frequency and the phase of the direct current voltage sampling according to the received frequency and phase signals; the output end of the direct-current voltage sampling module is connected with the input end of the frequency spectrum analysis module;
the frequency spectrum analysis module is used for respectively carrying out Fourier processing on the direct current sampling value and the direct voltage sampling value and outputting the processed direct current component and the processed direct voltage component to the direct current electric energy calculation module; outputting the processed ripple current component and ripple voltage component to a ripple electric energy calculation module;
the direct current electric energy calculating module is used for calculating to obtain direct current electric energy; and
and the ripple electric energy calculating module is used for calculating each ripple electric energy corresponding to each subharmonic.
Furthermore, the device comprises a phase frequency synchronization module, wherein the output end of the phase frequency synchronization module is connected with the signal receiving unit of the direct current sampling module and the signal receiving unit of the direct voltage sampling module, and the phase frequency synchronization module sends signals with the same frequency and phase to the signal receiving unit of the direct current sampling module and the signal receiving unit of the direct voltage sampling signal;
further, the direct current sampling module comprises a signal sending unit, and the signal sending unit of the direct current sampling module is connected with the signal receiving unit of the direct voltage sampling module and is used for enabling the frequency and phase signals of the direct voltage sampling module to be the same as those of the direct current sampling module;
further, the direct current voltage sampling module comprises a signal sending unit, and the signal sending unit of the direct current voltage sampling module is connected with the signal receiving unit of the direct current sampling module and is used for enabling the frequency and phase signals of the direct current sampling module to be the same as those of the direct current voltage sampling module;
furthermore, the direct current voltage sampling module is a resistance voltage division type voltage transformer capable of receiving and transmitting frequency and phase control signals;
furthermore, the direct current sampling module is a through current-limiting transformer capable of receiving and transmitting frequency and phase control signals;
further, the phase frequency synchronization module is a signal generator.
A method of direct current electrical energy metering based on spectral analysis and synchronous sampling, the method comprising:
step 1, adjusting phase frequency synchronization to enable the sampling frequency and phase of direct current sampling to be the same as the sampling frequency and phase of direct voltage sampling;
step 2, sampling the direct current to be detected, and sampling the direct voltage to be detected;
step 3, respectively carrying out Fourier transform processing on the direct current sampling value and the direct voltage sampling value; and
and 4, calculating to obtain direct current electric energy by using the direct current component and the direct voltage component after the Fourier transform, and calculating to obtain each time of ripple electric energy by using each time of ripple current component and each time of ripple voltage component obtained after the Fourier transform.
Further, the adjusting of the phase frequency synchronization means that a phase frequency synchronization module is used for sending a phase frequency adjustment signal to a direct current sampling module and a direct voltage sampling module;
furthermore, the phase and frequency synchronization adjustment means that the direct current sampling module sends the phase and frequency of the sampling signal to the direct voltage sampling module, and the direct voltage sampling module adjusts the direct voltage sampling according to the phase and frequency of the received direct current sampling signal to use the same phase and frequency;
furthermore, the phase and frequency synchronization adjustment means that the direct current voltage sampling module sends the phase and frequency of the sampling signal to the direct current sampling module, and the direct current sampling module adjusts the direct current sampling according to the phase and frequency of the received direct current voltage sampling signal to use the same phase and frequency;
further, the frequency of the dc current component and the dc voltage component after the fourier transform are both 0.
The invention has the beneficial effects that: the technical scheme of the invention provides a direct current electric energy metering device and a direct current electric energy metering method based on frequency spectrum analysis and synchronous sampling, the method improves the accuracy of dynamic metering of direct current electric energy and solves the problem of metering error caused by dynamics, the method distinguishes direct current electric energy and ripple electric energy, measures each ripple respectively, can judge whether a user is a ripple sending party or a ripple absorbing party according to a metering result, and provides richer technical means for future direct current electric energy management; meanwhile, the method can measure direct current electric energy and alternating current electric energy, and provides a technical basis for the alternating current and direct current electric energy mixed measurement technology.
Drawings
A more complete understanding of exemplary embodiments of the present invention may be had by reference to the following drawings in which:
fig. 1 is a structural diagram of a dc power metering device with a frequency phase synchronization module according to an embodiment of the present invention;
fig. 2 is a structural diagram of a dc power metering device with a signal sending unit of a dc current sampling module according to an embodiment of the present invention;
fig. 3 is a structural diagram of a dc power metering device with a signal sending unit of a dc voltage sampling module according to an embodiment of the present invention;
FIG. 4 is a flow chart of a direct current power metering method based on spectrum analysis and synchronous sampling according to an embodiment of the present invention; and
fig. 5 is a structural diagram of an off-board charger field calibrator for an electric vehicle, which applies a direct current metering method based on spectrum analysis and synchronous sampling according to an embodiment of the present invention.
Detailed Description
The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the embodiments described herein, which are provided for complete and complete disclosure of the present invention and to fully convey the scope of the present invention to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the invention. In the drawings, the same units/elements are denoted by the same reference numerals.
Unless otherwise defined, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Further, it will be understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
Fig. 1 is a structural diagram of a dc power metering device with a frequency phase synchronization module according to an embodiment of the present invention; the device includes:
the direct current sampling module 101 is configured to sample a direct current, and the direct current sampling module 101 includes a signal receiving unit configured to adjust a frequency and a phase of the direct current sampling according to a received frequency and a phase signal; the output end of the direct current sampling module 101 is connected with the input end of the spectrum analysis 103 module;
the dc voltage sampling module 102, where the dc voltage sampling module 102 is configured to sample a dc voltage, and the dc voltage sampling module includes a signal receiving unit, and the signal receiving unit is configured to adjust a frequency and a phase of the dc voltage sampling according to a received frequency and a phase signal; the output end of the direct current voltage sampling module 102 is connected with the input end of the spectrum analysis module 103;
the frequency spectrum analysis module 103 is configured to perform fourier processing on the dc current sampling value and the dc voltage sampling value, and output a processed dc current component and a processed dc voltage component to the dc power calculation module 104; outputting the processed ripple current component and ripple voltage component to a ripple electric energy calculation module 105;
the direct current electric energy calculating module 104, wherein the direct current electric energy calculating module 104 is used for calculating to obtain direct current electric energy;
the ripple electric energy calculating module 105, wherein the ripple electric energy calculating module 105 is used for each ripple electric energy corresponding to each harmonic;
the output end of the phase frequency synchronization module 106 is connected to the signal receiving unit of the dc current sampling module 101 and the signal receiving unit of the dc voltage sampling module 102, and the phase frequency synchronization module 106 sends the same frequency and phase signal to the signal receiving unit of the dc current sampling module and the signal receiving unit of the dc voltage sampling signal;
furthermore, the direct current voltage sampling module is a resistance voltage division type voltage transformer capable of receiving and transmitting frequency and phase control signals;
furthermore, the direct current sampling module is a through current-limiting transformer capable of receiving and transmitting frequency and phase control signals;
further, the phase frequency synchronization module is a signal generator.
Fig. 2 is a structural diagram of a dc power metering device with a signal sending unit of a dc current sampling module according to an embodiment of the present invention; the device includes:
the direct current sampling module 201, the direct current sampling module 201 is configured to sample a direct current, the direct current sampling module 201 includes a signal sending unit, the signal sending unit of the direct current sampling module 201 is connected to a signal receiving unit of the direct voltage sampling module 202, and is configured to enable a frequency and a phase signal of the direct voltage sampling module 202 to be the same as those of the direct current sampling module 201; the output end of the direct current sampling module 201 is connected with the input end of the spectrum analysis 203 module;
a dc voltage sampling module 202, wherein the dc voltage sampling module 202 is configured to sample a dc voltage, and the dc voltage sampling module includes a signal receiving unit, and the signal receiving unit is configured to adjust a frequency and a phase of the dc voltage sampling according to a received frequency and a phase signal; the output end of the direct current voltage sampling module 202 is connected with the input end of the spectrum analysis module 203;
the frequency spectrum analysis module 203 is configured to perform fourier processing on the dc current sampling value and the dc voltage sampling value, and output a processed dc current component and a processed dc voltage component to the dc power calculation module 204; outputting the processed ripple current component and ripple voltage component to a ripple electric energy calculation module 205;
the direct current electric energy calculating module 204 is used for calculating to obtain direct current electric energy;
the ripple electric energy calculation module 205, where the ripple electric energy calculation module 205 is configured to calculate each ripple electric energy corresponding to each harmonic;
furthermore, the direct current voltage sampling module is a resistance voltage division type voltage transformer capable of receiving and transmitting frequency and phase control signals;
furthermore, the direct current sampling module is a through current-limiting transformer capable of receiving and transmitting frequency and phase control signals;
further, the phase frequency synchronization module is a signal generator.
Fig. 3 is a structural diagram of a dc power metering device with a signal sending unit of a dc voltage sampling module according to an embodiment of the present invention; the device includes:
a direct current sampling module 301, where the direct current sampling module 301 is configured to sample a direct current, and the direct current sampling module includes a signal receiving unit, and the signal receiving unit is configured to adjust a frequency and a phase of the direct current sampling according to a received frequency and a phase signal; the output end of the direct current sampling module 301 is connected with the input end of the spectrum analysis module 303;
the dc voltage sampling module 302, the dc voltage sampling module 302 is configured to sample a dc voltage, the dc voltage sampling module 302 includes a signal sending unit, the signal sending unit of the dc voltage sampling module 302 is connected to the signal receiving unit of the dc current sampling module 301, and is configured to enable a frequency and a phase signal of the dc voltage sampling module 301 to be the same as those of the dc voltage sampling module 302; the output end of the direct-current voltage sampling module 302 is connected with the input end of the spectrum analysis module 303;
the frequency spectrum analysis module 303 is configured to perform fourier processing on the dc current sampling value and the dc voltage sampling value, and output a processed dc current component and a processed dc voltage component to the dc power calculation module 304; outputting the processed ripple current component and ripple voltage component to a ripple electric energy calculation module 305;
the direct current electric energy calculating module 304, the direct current electric energy calculating module 304 is configured to calculate to obtain direct current electric energy;
the ripple electric energy calculation module 305, where the ripple electric energy calculation module 305 is configured to calculate ripple electric energy of each sub-harmonic;
furthermore, the direct current voltage sampling module is a resistance voltage division type voltage transformer capable of receiving and transmitting frequency and phase control signals;
furthermore, the direct current sampling module is a through current-limiting transformer capable of receiving and transmitting frequency and phase control signals;
further, the phase frequency synchronization module is a signal generator.
Fig. 4 is a flowchart of a dc power metering method based on spectrum analysis and synchronous sampling according to an embodiment of the present invention, where the method includes:
and step 404, calculating to obtain direct current electric energy by using the direct current component and the direct voltage component after the fourier transform, and calculating to obtain each ripple electric energy by using each ripple current component and each ripple voltage component obtained after the fourier transform.
Further, the adjusting of the phase frequency synchronization means that a phase frequency synchronization module is used for sending a phase frequency adjustment signal to a direct current sampling module and a direct voltage sampling module;
furthermore, the phase and frequency synchronization adjustment means that the direct current sampling module sends the phase and frequency of the sampling signal to the direct voltage sampling module, and the direct voltage sampling module adjusts the direct voltage sampling according to the phase and frequency of the received direct current sampling signal to use the same phase and frequency;
furthermore, the phase and frequency synchronization adjustment means that the direct current voltage sampling module sends the phase and frequency of the sampling signal to the direct current sampling module, and the direct current sampling module adjusts the direct current sampling according to the phase and frequency of the received direct current voltage sampling signal to use the same phase and frequency;
further, the frequency of the dc current component and the dc voltage component after the fourier transform are both 0.
Fig. 5 is a structural diagram of an off-board charger field calibrator for an electric vehicle, which applies a direct current metering method based on spectrum analysis and synchronous sampling according to an embodiment of the present invention.
The on-site calibrator for the off-board charger of the electric automobile is used for on-site electric energy metering of the off-board charger of the electric automobile, a resistor voltage-dividing type voltage transformer is used for direct current sampling of the on-site calibrator, a straight-through current transformer is used for direct current sampling, and the phases and frequencies of the straight-through current transformer and the resistor voltage-dividing type voltage transformer are synchronized by a pulse synchronization method; and the voltage of each wave and the current of each wave are correspondingly input into the electric energy calculation module of each wave to be calculated so as to obtain the electric energy of each wave.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (11)
1. A direct current power metering device based on spectral analysis and synchronous sampling, the device comprising:
the direct current sampling module is used for sampling direct current, and comprises a signal receiving unit which is used for adjusting the frequency and the phase of direct current sampling according to received frequency and phase signals; the output end of the direct current sampling module is connected with the input end of the frequency spectrum analysis module;
the direct current voltage sampling module is used for sampling direct current voltage, and comprises a signal receiving unit which is used for adjusting the frequency and the phase of the direct current voltage sampling according to the received frequency and phase signals; the output end of the direct-current voltage sampling module is connected with the input end of the frequency spectrum analysis module;
the frequency spectrum analysis module is used for respectively carrying out Fourier processing on the direct current sampling value and the direct voltage sampling value and outputting the processed direct current component and the processed direct voltage component to the direct current electric energy calculation module; outputting the processed ripple current component and ripple voltage component to a ripple electric energy calculation module;
the output end of the phase frequency synchronization module is connected with the signal receiving unit of the direct current sampling module and the signal receiving unit of the direct voltage sampling module, and the phase frequency synchronization module sends the same frequency and phase signals to the signal receiving unit of the direct current sampling module and the signal receiving unit of the direct voltage sampling signal;
the direct current electric energy calculating module is used for calculating to obtain direct current electric energy; and
and the ripple electric energy calculating module is used for calculating each ripple electric energy corresponding to each subharmonic.
2. A direct current power metering device based on spectral analysis and synchronous sampling, the device comprising:
the direct current sampling module is used for sampling direct current, and comprises a signal receiving unit which is used for adjusting the frequency and the phase of direct current sampling according to received frequency and phase signals; the output end of the direct current sampling module is connected with the input end of the frequency spectrum analysis module;
the direct current voltage sampling module is used for sampling direct current voltage, and comprises a signal receiving unit which is used for adjusting the frequency and the phase of the direct current voltage sampling according to the received frequency and phase signals; the output end of the direct-current voltage sampling module is connected with the input end of the frequency spectrum analysis module;
the frequency spectrum analysis module is used for respectively carrying out Fourier processing on the direct current sampling value and the direct voltage sampling value and outputting the processed direct current component and the processed direct voltage component to the direct current electric energy calculation module; outputting the processed ripple current component and ripple voltage component to a ripple electric energy calculation module;
the direct current electric energy calculating module is used for calculating to obtain direct current electric energy; and
the ripple electric energy calculating module is used for calculating each ripple electric energy corresponding to each subharmonic;
the direct current sampling module comprises a signal sending unit, and the signal sending unit of the direct current sampling module is connected with the signal receiving unit of the direct voltage sampling module and used for enabling the frequency and phase signals of the direct voltage sampling module to be the same as those of the direct current sampling module.
3. A direct current power metering device based on spectral analysis and synchronous sampling, the device comprising:
the direct current sampling module is used for sampling direct current, and comprises a signal receiving unit which is used for adjusting the frequency and the phase of direct current sampling according to received frequency and phase signals; the output end of the direct current sampling module is connected with the input end of the frequency spectrum analysis module;
the direct current voltage sampling module is used for sampling direct current voltage, and comprises a signal receiving unit which is used for adjusting the frequency and the phase of the direct current voltage sampling according to the received frequency and phase signals; the output end of the direct-current voltage sampling module is connected with the input end of the frequency spectrum analysis module;
the frequency spectrum analysis module is used for respectively carrying out Fourier processing on the direct current sampling value and the direct voltage sampling value and outputting the processed direct current component and the processed direct voltage component to the direct current electric energy calculation module; outputting the processed ripple current component and ripple voltage component to a ripple electric energy calculation module;
the direct current electric energy calculating module is used for calculating to obtain direct current electric energy; and
the ripple electric energy calculating module is used for calculating each ripple electric energy corresponding to each subharmonic;
the direct current voltage sampling module comprises a signal sending unit, and the signal sending unit of the direct current voltage sampling module is connected with the signal receiving unit of the direct current sampling module and used for enabling the frequency and phase signals of the direct current sampling module to be the same as those of the direct current voltage sampling module.
4. The apparatus of any one of claims 1-3, wherein: the direct-current voltage sampling module is a resistance voltage-dividing type voltage transformer capable of receiving and transmitting frequency and phase control signals.
5. The apparatus of any one of claims 1-3, wherein: the direct current sampling module is a through current-limiting transformer capable of receiving and transmitting frequency and phase control signals.
6. The apparatus of claim 1, wherein: the phase frequency synchronization module is a signal generator.
7. A method of direct current electrical energy metering based on spectral analysis and synchronous sampling, the method comprising:
step 1, adjusting phase frequency synchronization to enable the sampling frequency and phase of direct current sampling to be the same as the sampling frequency and phase of direct voltage sampling;
step 2, sampling the direct current to be detected, and sampling the direct voltage to be detected;
step 3, respectively carrying out Fourier transform processing on the direct current sampling value and the direct voltage sampling value; and
step 4, calculating to obtain direct current electric energy by using the direct current component and the direct voltage component after the Fourier transform; and calculating to obtain the ripple electric energy of each time by using the ripple current component and the ripple voltage component of each time obtained after Fourier transform processing.
8. The method of claim 7, wherein: the phase frequency synchronization adjustment means that a phase frequency synchronization module is used for sending phase frequency adjustment signals to a direct current sampling module and a direct voltage sampling module.
9. The method of claim 7, wherein: the phase and frequency synchronization adjustment means that the direct current sampling module sends the phase and frequency of the sampling signal to the direct voltage sampling module, and the direct voltage sampling module adjusts the direct voltage sampling according to the phase and frequency of the received direct current sampling signal to use the same phase and frequency.
10. The method of claim 7, wherein: the phase and frequency synchronization adjustment means that the direct current voltage sampling module sends the phase and frequency of the sampling signal to the direct current sampling module, and the direct current sampling module adjusts the direct current sampling according to the phase and frequency of the received direct current voltage sampling signal to use the same phase and frequency.
11. The method of claim 7, wherein: and the frequencies of the direct current component and the direct voltage component after Fourier transformation are both 0.
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| CN113325233B (en) * | 2021-06-02 | 2024-04-09 | 云南电网有限责任公司电力科学研究院 | System and method for modulating and measuring ripple electric energy in direct-current electric energy |
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| JPH04252505A (en) * | 1991-01-29 | 1992-09-08 | Fujitsu Ltd | Power supply ripple measurement device |
| CN102998523A (en) * | 2012-12-25 | 2013-03-27 | 上海贝岭股份有限公司 | Harmonic power calculating method for electric energy measuring |
| CN103364601A (en) * | 2012-03-31 | 2013-10-23 | 盛吉高科（北京）科技有限公司 | Period average and delay window-based electric energy measurement method |
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| JPH04252505A (en) * | 1991-01-29 | 1992-09-08 | Fujitsu Ltd | Power supply ripple measurement device |
| CN103364601A (en) * | 2012-03-31 | 2013-10-23 | 盛吉高科（北京）科技有限公司 | Period average and delay window-based electric energy measurement method |
| CN102998523A (en) * | 2012-12-25 | 2013-03-27 | 上海贝岭股份有限公司 | Harmonic power calculating method for electric energy measuring |
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