CN201255768Y - Three phase harmonic standard electrical energy meter - Google Patents
Three phase harmonic standard electrical energy meter Download PDFInfo
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- CN201255768Y CN201255768Y CNU2008201646181U CN200820164618U CN201255768Y CN 201255768 Y CN201255768 Y CN 201255768Y CN U2008201646181 U CNU2008201646181 U CN U2008201646181U CN 200820164618 U CN200820164618 U CN 200820164618U CN 201255768 Y CN201255768 Y CN 201255768Y
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Abstract
A three-phase harmonic wave standard energy meter comprising a harmonic wave energy measurement module which comprises a voltage conversion unit and a current conversion unit, wherein the voltage conversion unit is connected with a first ADC conversion unit, and the current conversion unit is connected with a second ADC conversion unit. The harmonic wave energy measurement module further comprises a DSP calculation module which comprises a FFT transformation module and an amplitude phase compensation module for calculating the amplitude and the phase of the harmonic wave output by the FFT transformation module to attain each harmonic wave parameter. The three-phase harmonic wave standard energy meter further comprises a communication module for communicating the harmonic wave energy measurement module with external space, wherein the communication module is connected with a display screen and a man-machine interaction module. The communication module comprises a RS232 interface connected with external control equipment. The utility model provides a three-phase harmonic wave standard energy meter for calibrating and verifying harmonic wave energy meters.
Description
(1) technical field
The utility model relates to a kind of three phase harmonic standard electric energy meter.
(2) background technology
Along with the development of heavy industry such as modern industry and traffic, metallurgy, chemical industry and electric railway, the factor that influences the quality of power supply becomes increasingly complex, and wherein main is exactly electric harmonic.Impact and harmonic wave that these nonlinear-loads produce electrical network not only constitute very big harm to power system device and stabilization of power grids safe operation, and have influenced rationality and the fairness of conventional instrument to electric energy metrical.Therefore, the high-accuracy multifunctional electric energy meter with the monitoring of harmonic wave and metering becomes the electric energy metrical new product of new generation that power department emphasis is in recent years applied, and also makes power department that the real-time monitoring of power grid quality has been had certain means and foundation.
Because power department need use a large amount of harmonic electric energy tables, and domestic electric power detects standard electric energy meter that department, metrological service, manufacturing enterprise use at present and can't the harmonic electric energy table be calibrated and traces to the source, and this just is badly in need of corresponding high-grade harmonic standard electric energy meter it is examined and determine and calibrates.
(3) summary of the invention
In view of the deficiency that the standard electric energy meter of present use can't be calibrated and trace to the source the harmonic electric energy table, the utility model provides a kind of three phase harmonic standard electric energy meter that the harmonic electric energy table is calibrated and examined and determine.
The technical scheme in the invention for solving the technical problem is: a kind of three phase harmonic standard electric energy meter, comprise the harmonic electric energy metering module, described harmonic electric energy metering module comprise be used for will input the alternating voltage of different amplitudes convert the voltage transformation module of analog to digital converter acceptable alternating voltage small-signal to, be used for will input the alternating current of different amplitudes convert the current transformation unit of analog to digital converter acceptable alternating voltage small-signal to, described voltage transformation module is connected with an ADC converting unit that analog voltage signal is transformed into digital signal, and described current transformation unit is connected with the 2nd ADC converting unit that analog voltage signal is transformed into digital signal; Described harmonic electric energy metering module also comprises the DSP computing module, described DSP computing module comprises the FFT conversion module that is used for the digital signal of an ADC converting unit and the 2nd ADC converting unit input is carried out output integer after the fast fourier transform time and 1/4 subharmonic amplitude and harmonic phase, be used for the harmonious phase of wave place value of the humorous wave amplitude of FFT conversion module output is calculated the amplitude phase compensation block of each harmonic parameters, a described ADC converting unit all is connected with described FFT conversion module with the 2nd ADC converting unit, and described FFT conversion module also is connected with described amplitude phase compensation block; This three phase harmonic standard electric energy meter comprises that also one is used for described harmonic electric energy metering module and the extraneous communication module that carries out communication, described communication module connects display screen and the human-computer interaction module that is used to show each harmonic parameters, and this communication module also comprises and is used for the RS232 interface that is connected with external control devices.
Further, described display screen is or LCD display TFT display screen.
Further, described human-computer interaction module is a computing machine.
Further, described computing machine adopts Windows CE operating system.
Further, described computing machine adopts touch-screen as input equipment; Have data-carrier store and USB interface in the described computing machine.
The utility model in use, after its access three-phase measurement, voltage transformation module and current transformation unit can be selected suitable range according to the amplitude that inserts voltage and current signal, and the voltage and current signal of outside input is transformed into corresponding with it ADC converting unit acceptable voltage signal; The one ADC converting unit, the 2nd ADC converting unit are imported the DSP computing module to the analog voltage signal of input through becoming digital signal after quantizing; FFT conversion module in the DSP computing module obtains the integer time of input voltage, current signal and 1/4 subharmonic amplitude, harmonic phase value to the ADC digital signal of input through FFT (fast Fourier transform) back; Just obtained harmonic voltage amplitude, current harmonics amplitude, harmonic phase, harmonic wave active power, harmonic wave reactive power, forward harmonic electric energy, reverse harmonic electric energy, total these parameters of harmonic electric energy accurately after the harmonious phase of wave place value of these humorous wave amplitudes is calculated through the amplitude phase compensation block, these parameters can show on display screen through the transmission of communication module.Human-computer interaction module is used to operate various steering orders, for example show harmonic voltage amplitude, current harmonics amplitude, harmonic phase, harmonic wave active power, harmonic wave reactive power, forward harmonic electric energy, oppositely parameter such as harmonic electric energy, total harmonic electric energy selection, voltage, current range conversion etc.Its effect of RS232 interface in the communication module is to adopt the communication mode of duplex to receive the order of this equipment being controlled by external control devices, as voltage, current range are set; Also send the numerical value of various harmonic measure parameters to external control devices, as harmonic voltage amplitude, current harmonics amplitude, harmonic phase, harmonic wave active power, harmonic wave reactive power, forward harmonic electric energy, oppositely harmonic electric energy, total harmonic electric energy etc. according to the external control order.
The beneficial effects of the utility model are: 1. can carry out accurate metering in the 0-360 degree scope to each time voltage, current harmonics amplitude, harmonic phase, harmonic wave active power, the harmonic wave reactive power of 1-80 integral frequency harmonizing wave and 1/4 mark subharmonic by the FFT conversion module in the DSP computing module and amplitude phase compensation block, and can distinguish the direction of harmonic trend.2. the calculating by the amplitude phase compensation block can be exported forward harmonic electric energy, oppositely harmonic electric energy, total harmonic electric energy, can carry out that the algebraic sum mode adds up and the absolute value mode adds up to harmonic electric energy, power.3. by high-precision voltage transformation module, current transformation unit, ADC converter unit, FFT conversion module and amplitude phase compensation block, this standard scale can reach very high accuracy class.The national metering scientific research of process institute is detected, and fundamental energy power satisfies 0.02% accuracy requirement, and harmonic voltage current amplitude, harmonic power satisfy 0.02% accuracy requirement in the 1-60 underrange.4. adopt windows CE operating system, have very strong reliability and security, and tool man machine operation interface very easily, anyly can use can manipulating very easily per capita of desktop windows operating system.5. adopt touch-sensitive display to carry out man-machine interaction, adopt this mode step that can simplify the operation greatly, operate very simple.6. adopt high reliability, convenient easy-to-use file management system.Measurement data can shift from data-carrier store easily by USB interface and be stored in the FLASH dish.
(4) description of drawings
Fig. 1 is a theory diagram of the present utility model.
(5) embodiment
Below in conjunction with the drawings and specific embodiments the utility model is described in further detail.
With reference to Fig. 1, a kind of three phase harmonic standard electric energy meter, comprise harmonic electric energy metering module 1, described harmonic electric energy metering module 1 comprise be used for will input the alternating voltage of different amplitudes convert the voltage transformation module 2 of analog to digital converter acceptable alternating voltage small-signal to, be used for will input the alternating current of different amplitudes convert the current transformation unit 3 of analog to digital converter acceptable alternating voltage small-signal to, described voltage transformation module 2 is connected with an ADC converting unit 4 that analog voltage signal is transformed into digital signal, and described current transformation unit 3 is connected with the 2nd ADC converting unit 5 that analog voltage signal is transformed into digital signal; Described harmonic electric energy metering module 1 also comprises DSP computing module 6, described DSP computing module 6 comprises the FFT conversion module 7 that is used for the digital signal of an ADC converting unit 4 and the input of the 2nd ADC converting unit 5 is carried out output integer after the fast fourier transform time and 1/4 subharmonic amplitude and harmonic phase, be used for the harmonious phase of wave place value of humorous wave amplitude of FFT conversion module 7 outputs is calculated the amplitude phase compensation block 8 of each harmonic parameters, a described ADC converting unit 4 all is connected with described FFT conversion module 7 with the 2nd ADC converting unit 5, and described FFT conversion module 7 also is connected with described amplitude phase compensation block 8; This three phase harmonic standard electric energy meter comprises that also one is used for described harmonic electric energy metering module 1 and the extraneous communication module 9 that carries out communication, described communication module 9 connects display screen 10 and the human-computer interaction module 11 that is used to show each harmonic parameters, and this communication module 9 also comprises and is used for the RS232 interface 12 that is connected with external control devices.
In the present embodiment, described display screen 10 can be selected LCD display or TFT display screen.
In the present embodiment, described human-computer interaction module 11 is a computing machine, and this computing machine adopts Windows CE operating system, has data-carrier store and USB interface in this computing machine.
The utility model in use, after its access three-phase measurement, voltage transformation module 2 and current transformation unit 3 can be selected suitable range according to the amplitude that inserts voltage and current signal, and the voltage and current signal of outside input is transformed into corresponding with it ADC converting unit acceptable voltage signal; The one ADC converting unit 4, the 2nd ADC converting unit 5 are imported DSP computing module 6 to the analog voltage signal of input through becoming digital signal after quantizing; FFT conversion module 7 in the DSP computing module 6 obtains the integer time of input voltage, current signal and 1/4 subharmonic amplitude, harmonic phase value to the ADC digital signals of input through FFT (fast Fourier transform) back; Just obtained harmonic voltage amplitude, current harmonics amplitude, harmonic phase, harmonic wave active power, harmonic wave reactive power, forward harmonic electric energy, reverse harmonic electric energy, total these parameters of harmonic electric energy accurately after the harmonious phase of wave place value of these humorous wave amplitudes is calculated through amplitude phase compensation block 8, these parameters can show on display screen 10 through the transmission of communication module 9.Human-computer interaction module 11 is used to operate various steering orders, for example show harmonic voltage amplitude, current harmonics amplitude, harmonic phase, harmonic wave active power, harmonic wave reactive power, forward harmonic electric energy, oppositely parameter such as harmonic electric energy, total harmonic electric energy selection, voltage, current range conversion etc.RS232 interface 12 its effects in the communication module are to adopt the communication mode of duplex to receive the order of this equipment being controlled by external control devices, as voltage, current range are set; Also send the numerical value of various harmonic measure parameters to external control devices, as harmonic voltage amplitude, current harmonics amplitude, harmonic phase, harmonic wave active power, harmonic wave reactive power, forward harmonic electric energy, oppositely harmonic electric energy, total harmonic electric energy etc. according to the external control order.
Claims (6)
1. three phase harmonic standard electric energy meter, it is characterized in that: comprise the harmonic electric energy metering module, described harmonic electric energy metering module comprise be used for will input the alternating voltage of different amplitudes convert the voltage transformation module of analog to digital converter acceptable alternating voltage small-signal to, be used for will input the alternating current of different amplitudes convert the current transformation unit of analog to digital converter acceptable alternating voltage small-signal to, described voltage transformation module is connected with an ADC converting unit that analog voltage signal is transformed into digital signal, and described current transformation unit is connected with the 2nd ADC converting unit that analog voltage signal is transformed into digital signal;
Described harmonic electric energy metering module also comprises the DSP computing module, described DSP computing module comprises the FFT conversion module that is used for the digital signal of an ADC converting unit and the 2nd ADC converting unit input is carried out output integer after the fast fourier transform time and 1/4 subharmonic amplitude and harmonic phase, be used for the harmonious phase of wave place value of the humorous wave amplitude of FFT conversion module output is calculated the amplitude phase compensation block of each harmonic parameters, a described ADC converting unit all is connected with described FFT conversion module with the 2nd ADC converting unit, and described FFT conversion module also is connected with described amplitude phase compensation block;
This three phase harmonic standard electric energy meter comprises that also one is used for described harmonic electric energy metering module and the extraneous communication module that carries out communication, described communication module connects display screen and the human-computer interaction module that is used to show each harmonic parameters, and this communication module also comprises and is used for the RS232 interface that is connected with external control devices.
2. three phase harmonic standard electric energy meter as claimed in claim 1 is characterized in that: described display screen is LCD display or TFT display screen.
3. three phase harmonic standard electric energy meter as claimed in claim 1 or 2 is characterized in that: described human-computer interaction module is a computing machine.
4. three phase harmonic standard electric energy meter as claimed in claim 3 is characterized in that: described computing machine adopts Windows CE operating system.
5. three phase harmonic standard electric energy meter as claimed in claim 4 is characterized in that: described computing machine adopts touch-screen as input equipment.
6. the three phase harmonic standard electric energy meter of telling as claim 4 is characterized in that: have data-carrier store and USB interface in the described computing machine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201646181U CN201255768Y (en) | 2008-09-22 | 2008-09-22 | Three phase harmonic standard electrical energy meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201646181U CN201255768Y (en) | 2008-09-22 | 2008-09-22 | Three phase harmonic standard electrical energy meter |
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| Publication Number | Publication Date |
|---|---|
| CN201255768Y true CN201255768Y (en) | 2009-06-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNU2008201646181U Expired - Fee Related CN201255768Y (en) | 2008-09-22 | 2008-09-22 | Three phase harmonic standard electrical energy meter |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101382588B (en) * | 2008-09-22 | 2011-03-30 | 慈溪伟吉电子有限公司 | Three phase harmonic standard electric energy meter |
| CN102230959A (en) * | 2011-04-21 | 2011-11-02 | 深圳市锐能微科技有限公司 | Method and system for calibrating electric energy meter and electric energy meter |
| CN106990286A (en) * | 2017-03-14 | 2017-07-28 | 合肥工业大学 | Four-quadrant metering device for harmonic electric energy and method based on Euler's method |
-
2008
- 2008-09-22 CN CNU2008201646181U patent/CN201255768Y/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101382588B (en) * | 2008-09-22 | 2011-03-30 | 慈溪伟吉电子有限公司 | Three phase harmonic standard electric energy meter |
| CN102230959A (en) * | 2011-04-21 | 2011-11-02 | 深圳市锐能微科技有限公司 | Method and system for calibrating electric energy meter and electric energy meter |
| CN106990286A (en) * | 2017-03-14 | 2017-07-28 | 合肥工业大学 | Four-quadrant metering device for harmonic electric energy and method based on Euler's method |
| CN106990286B (en) * | 2017-03-14 | 2019-08-02 | 合肥工业大学 | Four-quadrant metering device for harmonic electric energy and method based on Euler's method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: Ningbo Weiji Electric Power Technology Co.,Ltd. Assignor: Cixi Weiji Electronic Co., Ltd. Contract record no.: 2011330001075 Denomination of utility model: Three phase harmonic standard electric energy meter Granted publication date: 20090610 License type: Exclusive License Record date: 20110817 |
|
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090610 Termination date: 20130922 |