CN106093842B - Three-phase harmonic standard electric energy meter - Google Patents
Three-phase harmonic standard electric energy meter Download PDFInfo
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- CN106093842B CN106093842B CN201610808679.6A CN201610808679A CN106093842B CN 106093842 B CN106093842 B CN 106093842B CN 201610808679 A CN201610808679 A CN 201610808679A CN 106093842 B CN106093842 B CN 106093842B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/04—Testing or calibrating of apparatus covered by the other groups of this subclass of instruments for measuring time integral of power or current
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Abstract
The invention relates to the technical field of electric energy metering equipment, in particular to a three-phase harmonic standard electric energy meter, which comprises an acquisition unit, an A/D conversion unit, a digital signal processing unit and an output unit.
Description
Technical Field
The invention relates to the technical field of electric energy metering equipment, in particular to a three-phase harmonic standard electric energy meter.
Background
The electric energy meter is an instrument for measuring electric energy, is mainly used for measuring the amount of power consumption of a user, and mainly comprises an input unit, a measuring unit and a display unit, wherein the measuring unit calculates an electric energy signal according to the input signal and transmits the electric energy signal to the display unit for displaying.
Disclosure of Invention
The invention aims to solve the technical problem of overcoming the defect of inaccurate metering of an electric energy meter caused by unstable power utilization signals in the prior art, thereby providing a three-phase harmonic standard electric energy meter, and the scheme is as follows:
three-phase harmonic standard electric energy meter includes:
the acquisition unit acquires a sampling input signal and an electric energy signal;
the A/D conversion unit is used for respectively converting the sampling input signal and the electric energy signal into digital signals;
the digital signal processing unit is used for calculating a compensation value according to the digital signal of the electric energy signal and the digital signal of the sampling input signal and compensating the electric energy signal to obtain a standard electric energy signal;
and the output unit is used for outputting the standard electric energy signal.
Preferably, the output unit includes:
the parameter calculation unit is used for converting the standard electric energy signals into various types of electric energy signals;
the type selection unit is used for selecting the type of the output electric energy signal;
and the display unit displays the electric energy signal of the type selected by the type selection unit.
Preferably, the sampling input signal is a sampling signal with a preset sampling interval, and the electric energy signal is a voltage signal or a current signal.
Preferably, the digital signal processing unit further includes:
a receiving unit receiving a digital signal of the power signal and a digital signal of the sampling input signal;
the computing unit is used for computing the compensation magnitude of the digital signal of the electric energy signal and the digital signal of the sampling input signal;
and the compensation module is used for compensating the frequency of the digital signal of the electric energy signal by adopting the compensation quantity value.
Preferably, the three-phase harmonic standard electric energy meter further comprises a communication unit, and the communication unit is used for establishing communication connection between the key operation unit and the output unit so as to transmit operation control commands.
Preferably, the communication unit is an RS-282 communication unit and/or an RS-485 communication unit.
Preferably, the operation unit is a key operation unit for selecting the displayed parameter type by operation.
Preferably, the parameter types of the power signal include: voltage amplitude, current harmonic amplitude, harmonic phase, harmonic active power, harmonic reactive power, forward harmonic power, directional harmonic power, and total harmonic power.
Preferably, the key operation unit is a touch key unit, and is integrated with the display unit on a touch display screen.
Preferably, the a/D conversion unit includes two a/D conversion subunits, one a/D conversion subunit converts the sampled input signal into a digital signal, and the other a/D conversion subunit converts the electric energy signal into a digital signal.
The technical scheme of the invention has the following advantages:
1. according to the three-phase harmonic standard electric energy meter provided by the invention, a sampling input signal is added as a reference signal to sample the electric energy signal, and when the two signals are deviated, the electric energy signal is compensated to obtain an accurate electric energy value and output, so that the metering accuracy of the electric energy meter is improved.
2. The three-phase harmonic standard electric energy meter provided by the invention is provided with the communication module, the type of the electric energy parameter displayed on the electric energy meter can be controlled through the operation of the communication module, and the flexibility of the electric energy meter in displaying the parameter is enlarged.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic structural diagram of a specific example of a three-phase harmonic standard electric energy meter in embodiment 1 of the present invention;
fig. 2 is a schematic structural diagram of an output unit in a specific example of a three-phase harmonic standard electric energy meter in embodiment 1 of the present invention;
fig. 3 is a schematic structural diagram of a digital signal processing unit in a specific example of a three-phase harmonic standard electric energy meter in embodiment 1 of the present invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; the two elements may be directly connected or indirectly connected through an intermediate medium, or may be communicated with each other inside the two elements, or may be wirelessly connected or wired connected. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Example 1
The embodiment provides a three-phase harmonic standard electric energy meter, which, with reference to the structure shown in fig. 1, includes an obtaining unit, an a/D conversion unit, a digital signal processing unit, and an output unit, wherein the obtaining unit obtains a sampling input signal and an electric energy signal; the A/D conversion unit respectively converts the sampling input signal and the electric energy signal into digital signals; the digital signal processing unit calculates a compensation value according to the digital signal of the electric energy signal and the digital signal of the sampling input signal, and compensates the electric energy signal to obtain a standard electric energy signal (for example, if the frequency of the digital signal of the sampling input signal is P1, the frequency of the digital signal of the electric energy signal is P2, the compensation value P0= P1-P2, and the frequency of the standard electric energy signal is (P2 + P0)); the output unit is used for outputting the standard electric energy signal.
The compensation quantity value can be, but is not limited to, the compensation of the frequency or the size of the digital signal of the electric energy signal, a user can set the compensation quantity value by himself, or a system can intelligently judge and calculate the compensation quantity value according to the sampling input signal and the electric energy signal for compensation, for example, when the sampling input signal and the electric energy signal have the same frequency and the size fluctuates, the compensation quantity value is the compensation of the size value, and conversely, when the sampling input signal and the electric energy signal have the same frequency and the size fluctuates, the compensation is the compensation of the frequency.
The three-phase harmonic standard electric energy meter provided by the embodiment takes the sampling input signal as the reference signal, samples the electric energy signal, and compensates the electric energy signal when the two have a deviation, so as to obtain an accurate electric energy value, and improve the metering accuracy of the electric energy meter.
As a preferred embodiment of the present invention, referring to fig. 2, the output unit includes:
the parameter calculation unit is used for converting the standard electric energy signals into various types of electric energy signals;
the type selection unit is used for selecting the type of the output electric energy signal;
and the display unit displays the electric energy signal of the type selected by the type selection unit.
The output unit is provided with the parameter calculation unit and the type selection unit, so that the electric energy signal of the type selected by the user can be output according to the selection of the user, and the flexibility of displaying the electric energy signal of the electric energy meter is improved.
As a preferred embodiment of the present invention, the sampling input signal is a sampling signal having a preset sampling interval, and the power signal is a voltage signal or a current signal.
As a preferred embodiment of the present invention, referring to fig. 3, the digital signal processing unit further includes:
a receiving unit receiving a digital signal of the power signal and a digital signal of the sampling input signal;
the computing unit is used for computing the compensation magnitude of the digital signal of the electric energy signal and the digital signal of the sampling input signal;
and the compensation module is used for compensating the digital signal of the electric energy signal by adopting the compensation value.
The digital signal processing unit calculates a compensation quantity value according to the frequency of the digital signal of the sampling input signal and the frequency of the digital signal of the electric energy signal, and obtains a standard electric energy signal according to the compensation quantity value and the digital signal of the electric energy signal, thereby effectively solving the technical defect of inaccurate measurement of the electric energy meter.
As a preferred embodiment of the present invention, the three-phase harmonic standard electric energy meter further includes a communication unit, which is used for the key operation unit to establish communication connection with the output unit so as to transmit the operation control command.
On the basis, the communication unit is further an RS-282 communication unit and/or an RS-485 communication unit.
As a preferred embodiment of the present invention, the operation unit is a key operation unit, and is configured to select a type of the displayed parameter by operating the key operation unit, and the user selects the type of the parameter to be displayed by operating the key operation unit, and displays the parameter of the selected type by using the display unit.
On the basis, further, the parameter types of the electric energy signal include: voltage amplitude, current harmonic amplitude, harmonic phase, harmonic active power, harmonic reactive power, forward harmonic power, directional harmonic power, and total harmonic power.
Meanwhile, the key operation unit is a touch key unit and is integrated with the display unit on a touch display screen, so that the display unit and the key operation unit are integrated together and are similar to a screen of a daily smart phone, and the attractiveness of the three-phase harmonic standard electric energy meter is enhanced.
On the basis, the A/D conversion unit comprises two A/D conversion subunits, one A/D conversion subunit converts the sampling input signal into a digital signal, and the other A/D conversion subunit converts the electric energy signal into the digital signal so as to provide a digitized sampling input signal and a digitized electric energy signal for calculating the compensation value and the standard electric energy signal in the subsequent steps.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (8)
1. Three-phase harmonic standard electric energy meter, its characterized in that includes: the device comprises an acquisition unit, a processing unit and a control unit, wherein the acquisition unit acquires a sampling input signal and an electric energy signal, the sampling input signal is obtained by sampling the electric energy signal, the sampling input signal is a sampling signal with a preset sampling interval, and the electric energy signal is a voltage signal or a current signal; the A/D conversion unit is used for respectively converting the sampling input signal and the electric energy signal into digital signals; the digital signal processing unit is used for calculating a compensation value according to the digital signal of the electric energy signal and the digital signal of the sampling input signal and compensating the electric energy signal to obtain a standard electric energy signal; the output unit is used for outputting the standard electric energy signal; wherein the digital signal processing unit further comprises: a receiving unit receiving a digital signal of the power signal and a digital signal of the sampling input signal; the calculating unit is used for calculating the compensation magnitude of the digital signal of the electric energy signal and the digital signal of the sampling input signal by taking the sampling input signal as a reference signal; and the compensation module is used for compensating the digital signal of the electric energy signal by adopting the compensation value.
2. The three-phase harmonic standard electric energy meter according to claim 1, wherein the output unit comprises: the parameter calculation unit is used for converting the standard electric energy signals into various types of electric energy signals; the type selection unit is used for selecting the type of the output electric energy signal;
and the display unit displays the electric energy signal of the type selected by the type selection unit.
3. The three-phase harmonic standard electric energy meter according to claim 2, further comprising a communication unit for establishing a communication connection between the key operation unit and the output unit to transmit an operation control command.
4. The three-phase harmonic standard electric energy meter according to claim 3, wherein the communication unit is an RS-485 communication unit.
5. The three-phase harmonic standard electric energy meter according to claim 3, wherein the types of the electric energy signal include: voltage amplitude, current harmonic amplitude, harmonic phase, harmonic active power, harmonic reactive power, forward harmonic power, directional harmonic power, and total harmonic power.
6. The three-phase harmonic standard electric energy meter according to claim 5, wherein the key operation unit is used for selecting the type of the displayed electric energy signal through operation.
7. The three-phase harmonic standard electric energy meter according to claim 6, wherein the key operation unit is a touch key unit, and is integrated with the display unit on a touch display screen.
8. The three-phase harmonic standard electric energy meter according to claim 1, wherein the a/D conversion unit comprises two a/D conversion sub-units, one a/D conversion sub-unit converts the sampled input signal into a digital signal, and the other a/D conversion sub-unit converts the electric energy signal into a digital signal.
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| CN201610808679.6A CN106093842B (en) | 2016-09-08 | 2016-09-08 | Three-phase harmonic standard electric energy meter |
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| CN106093842B true CN106093842B (en) | 2020-08-11 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106771578A (en) * | 2017-03-22 | 2017-05-31 | 国网辽宁省电力有限公司大连供电公司 | The non-integer-period sampled method of the electric power signal of electric energy meter |
| CN110531153A (en) * | 2019-09-26 | 2019-12-03 | 浙江涵普电力科技有限公司 | A kind of high accuracy three-phase standard electric energy meter with harmonic measure |
| CN111175575A (en) * | 2020-01-07 | 2020-05-19 | 宁波市计量测试研究院（宁波市衡器管理所、宁波新材料检验检测中心） | Method for improving power factor angle measurement precision of standard electric energy meter |
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| CN101382588A (en) * | 2008-09-22 | 2009-03-11 | 慈溪伟吉电子有限公司 | Three phase harmonic standard electric energy meter |
| CN202057784U (en) * | 2011-04-29 | 2011-11-30 | 广州市格宁电气有限公司 | Online calibrating and digital online monitoring system for electric energy meter |
| CN202057725U (en) * | 2011-05-19 | 2011-11-30 | 利尔达科技有限公司 | A three-phase harmonic electric energy meter |
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|---|---|---|---|---|
| US8675722B2 (en) * | 2003-09-23 | 2014-03-18 | International Business Machines Corporation | Methods and apparatus for snapshot-based equalization of a communications channel |
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| JPH07128377A (en) * | 1993-10-28 | 1995-05-19 | Toyo Electric Mfg Co Ltd | Harmonic power integrating meter |
| CN101382588A (en) * | 2008-09-22 | 2009-03-11 | 慈溪伟吉电子有限公司 | Three phase harmonic standard electric energy meter |
| CN202057784U (en) * | 2011-04-29 | 2011-11-30 | 广州市格宁电气有限公司 | Online calibrating and digital online monitoring system for electric energy meter |
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