CN203535207U - Modularized three-phase instrument calibrating device for smart grid - Google Patents
Modularized three-phase instrument calibrating device for smart grid Download PDFInfo
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- CN203535207U CN203535207U CN201320464777.4U CN201320464777U CN203535207U CN 203535207 U CN203535207 U CN 203535207U CN 201320464777 U CN201320464777 U CN 201320464777U CN 203535207 U CN203535207 U CN 203535207U
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Abstract
The utility model provides a modularized three-phase instrument calibrating device for a smart grid. The modularized three-phase instrument calibrating device comprises an input interface and an output interface, the input interface is connected with a signal conditioning module, the signal conditioning module is connected with a data analysis and processing module, the data analysis and processing module is connected with a man-machine conversation module, and the man-machine conversation module is respectively connected with a voltage and current waveform control module and a three-phase angle sampling module; and the output interface is respectively connected with the voltage and current waveform control module and the three-phase angle sampling module, a three-phase waveform generation module is connected between the voltage and current waveform control module and the three-phase angle sampling module and connected with a power amplifier output transformer module, and the power amplifier output transformer module is connected with the output interface. The modules are connected by the aid of a certain communication pattern, and maintenance convenience and use diversity of a system can be improved.
Description
Technical field
The utility model relates to circuit arrangement technical field, specifically relates to the modular three-phase instrument calibration of a kind of used for intelligent electric network device.
Background technology
Electrotechnical instrument and meter is widely used in power industry, and the technical feature of product and quality directly affect the result of use of power consumer.Therefore in actual use, need to be frequently these be being undertaken to all kinds of electrotechnical instrument and meters of monitoring operation of power networks and examining and determine and test, to guarantee network system reliability of operation and degree of accuracy.
By intellecture property, look into newly, we do not find the Patents in effective three-phase calibration power source.And the technical standard relevant to three-phase electrician calibration equipment is exactly mainly the general provision > > of standard GB/T 6592-86 < < electronic measuring instrument error, JJG780-92 < < AC digital powermeter vertification regulation > >, GJB/J5857-2006 < < exchanges calibration power source vertification regulation > > etc., electrical safety performance requirement and test method to product are mainly measured with reference to standard GB/T 4793.1-1995 < <, the safety requirements part 1 of control and testing laboratory's electrical installation: General Requirement > >, JJG124-2005 < < reometer, voltage table, power meter and ohmmeter > > etc., do not set up the specific technical standard for three-phase electrician standard calibrating device.
The technology of electrotechnical instrument and meter is towards intellectuality, systematization, miniaturization, synthesization future development at present, the birth of new component or module, the widespread use of FPGA and ispPAC, and the processing speed of MCU is more and more faster, the function that makes single instrument is more and more stronger, index is more and more higher, volume is more and more less, and retained the communication interface that forms various test macros, man-machine dialog interface is also more directly perceived, convenient.Auto-Test System has self-diagnostic function and auto-alarm function, and can graphic, comprises graphical display function and pattern analysis function, becomes a main flow direction of electrotechnical instrument and meter development.In addition, electrical instrument can also be expanded to non-electricity measure instrument by electrical measurement means, sensor, is confined to electromagnetic measurement itself no longer completely.
Since 2008, international financial crisis and intelligent grid and the construction of power consumer information acquisition system bring significant impact to electrotechnical instrument and meter industry.As the important ring in intelligent grid, electric energy Measuring Device comprises that electric energy meter, electric parameters transducer, indicating instrument and all kinds of sample devices all will be to multi parameter intallingent intelligence sample terminal future developments.The functions such as the sampling of intelligent terminal concentrated message, unified call, distributed treatment, transmission, Storage & Display, and have plug and play and adaptation function as required.In the past few years, the meaning of accurate calibration electric energy becomes and becomes more and more important.Along with dwindling of government control scope, the appearance that the competition of aggravation and more multispan mains supply are carried, the necessity of carrying out more measurements of pin-point accuracies more frequently becomes unprecedentedly important.
Yet the calibration of electric energy meter is just achievable work of a series of testing tool associating of needs always, comprise voltage source, current source, with reference to electric energy meter and pulse comparator etc.This itself not only has adverse effect to the uncertainty of whole electric energy meter calibration process, and its implementation and safeguard it is also expensive.Therefore in actual demand, the integrated emphasis that becomes application is shown in multi-functional calibrating installation or source.
At the beginning of 2011, a lot of users query to the digital electric meter newly changing, and are in fact also that the accurate calibrating of electric energy meter is had higher requirement, and illustrate that the more useful test equipment of society need is for the quality testing of Related product and periodically calibrating.
Utility model content
Technical problem to be solved in the utility model is, overcomes problems of the prior art, and a kind of used for intelligent electric network modularization three-phase instrument calibration device is provided.
Used for intelligent electric network modularization three-phase instrument calibration device, is characterized in that, comprising:
One input interface, input interface connects a signal condition module, signal condition module connects a data analysis processing module, and data analysis processing module connects a man-machine conversation module, and man-machine conversation module connects respectively voltage current waveform control module and three-phase phase angle sampling module; Voltage current waveform control module gathers the three-phase voltage current amplitude control word of man-machine conversation module, and three-phase phase angle sampling module gathers three-phase phase control word and the frequency control word of man-machine conversation module;
One output interface, output interface connects respectively voltage current waveform control module and three-phase phase angle sampling module, between voltage current waveform control module and three-phase phase angle sampling module, be connected with three-phase waveform generation module, three-phase waveform generation module connects a power amplifier output transformer module, and power amplifier output transformer module connects output interface; Described voltage current waveform control module is carried out amplitude sampling to output interface, and described three-phase phase angle sampling module carries out phase sample to output interface; Three-phase waveform generation module gathers the three-phase voltage current amplitude signal of voltage current waveform control module, and three-phase waveform generation module gathers phase control words and the frequency control word of three-phase phase angle sampling module.
The main control chip of voltage current waveform control module intends adopting STC89C51 series processors.
Three-phase phase angle sampling module becomes square-wave signal after treatment by two sine waveforms, with rear generation phase signal, after shaping filter, be converted to again DC level, this DC level is compared with the DAC output signal of that is controlled by phase angle control word, if phase place locks, the signal of comparer output will trend towards zero volt level.
Three-phase waveform generation module, by FPGA module and DAC the electric circuit constitute, there is DDS module, three-phase voltage phase place and each phase current phase place by frequency and module, MUX MUX, dual-port Wave data RAM, host computer interface are set form in FPGA module wherein.
Power amplifier power supply adopts AC/DC Switching Power Supply.
Beneficial effect, the utility model is by application module technology, build multi-functional program control three-phase calibration equipment, comprise three-phase standard source and digital watch, with the feature of high precision, high stability, low maintenance cost, provide electrical measurement, thermal technology, telemechanical, scheduling of being applicable to electric system etc. to need measurement, check and high precision standard signal source and other to need high precision standard signal source to measure, check the device of occasion.
Major advantage is:
High precision: the technical indicator of this project maintains the leading position in like product at home, basic output accuracy is all controlled in 0.05%, meets the needs of metering completely.
High stability: the voltage of three phase power source, electric current, phase place output all adopt closed-loop control, and short-term stability reaches 0.01% range, and long-term stability reaches 0.02% range.
Low-cost: to adopt programming device, greatly reduced the use of discrete device, simplified electronic circuit, also reduced maintenance cost.Sample circuit adopts current transformer to replace precision resistance, has further reduced production cost.
The innovative point body of this project is present the following aspects also:
Modularization,
Device is by comprising the module compositions such as power supply, digital waveform generator, phase sample and control, power amplification, Signal Pretreatment, man-machine interaction, by certain communication mode, realize module and connect, be conducive to improve the variation of safeguarding convenience and use of system.
The application of high speed MCU,
Main modular has high speed MCU to control, and is conducive on the one hand the speed of inside modules data processing, has also improved on the other hand the reliability of intermodular data transmission.
The application of field programmable device
The application of FPGA and ispPAC, has realized usable range and more flexibly circuit formation widely to be similar to the pattern of standard component.The good characteristics such as the low-work voltage having with it, low-power consumption, can greatly reduce volume and the power consumption of calibrating installation.And exclusive field-programmable ability, for improving the effects such as the intelligent degree of instrument and meter and adaptive ability very obvious, can realize accurate hands-off tuning and automatic gain to control, improve antijamming capability.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, describe the utility model in detail;
Fig. 1 is used for intelligent electric network modularization three-phase instrument calibration schematic diagram of device described in the utility model.
Fig. 2 is electric current and voltage control module principle schematic described in the utility model.
Fig. 3 is the utility model phase angle controlling of sampling schematic diagram.
Fig. 4 is the utility model three-phase waveform generation schematic diagram.
Embodiment
For technological means, creation characteristic that the utility model is realized, reach object and effect is easy to understand, below in conjunction with concrete diagram, further set forth the utility model.
Referring to Fig. 1, used for intelligent electric network modularization three-phase instrument calibration device is by module compositions such as power supply, digital three phase waveform generator, phase sample and control, power amplification, Signal Pretreatment, data analysis, man-machine conversations.Internal system adopts high performance microcomputer and uses embedded OS, easy to operate to guarantee instrument interface close friend; Large-scale F PGA module application, in producing the waveform that can accurately control, had both been beneficial to development, exploitation, upgrading, was beneficial to again debugging, maintenance. and instrument has been realized voltage close loop, current closed-loop and phase angle closed loop, thus guarantee low drift and year degree of stability.In addition, instrument has RS232 interface and can be connected with PC easily, is applicable to Auto-Test System.
Specifically comprise:
One input interface, input interface connects a signal condition module, signal condition module connects a data analysis processing module, and data analysis processing module connects a man-machine conversation module, and man-machine conversation module connects respectively voltage current waveform control module and three-phase phase angle sampling module; Voltage current waveform control module gathers the three-phase voltage current amplitude control word of man-machine conversation module, and three-phase phase angle sampling module gathers three-phase phase control word and the frequency control word of man-machine conversation module.
One output interface, output interface connects respectively voltage current waveform control module and three-phase phase angle sampling module, between voltage current waveform control module and three-phase phase angle sampling module, be connected with three-phase waveform generation module, three-phase waveform generation module connects a power amplifier output transformer module, and power amplifier output transformer module connects output interface; Described voltage current waveform control module is carried out amplitude sampling to output interface, and described three-phase phase angle sampling module carries out phase sample to output interface; Three-phase waveform generation module gathers the three-phase voltage current amplitude signal of voltage current waveform control module, and three-phase waveform generation module gathers phase control words and the frequency control word of three-phase phase angle sampling module.
The present embodiment adopts modular design, wherein:
Man-machine conversation module
Man-machine conversation adopts existing commercially available LCD MODULE, is equipped with necessary button and switch etc., and its control section adopts ARM embedded system or other equivalent electrical circuit, and software adopts μ C/OS-II operating system and ZLGGUI control to write.Major function is the demonstration realizing the input and output setting of calibrating installation and state parameter and figure.If the amount of data analysis is not very large, can directly by this module, be processed.
Voltage current waveform control module
The principle of voltage current waveform control module as shown in Figure 2, main control chip intends adopting the STC89C51 series processors that integrated level is higher, expandability is strong, antijamming capability is stronger, structure can be simplified, and meanwhile, correction data can store in the FLASH or E2PROM that CPU carries.
The circuit of simulation part still adopts more classical closed-loop system, and precision that like this can output voltage (electric current) can be fully guaranteed.But consider the development of components and parts, intend replacing with the product of new model the D/A chip of old model, therefore in circuit design, also will correspondingly to the parameter of part peripheral circuit, do a little adjustment.
In current feedback sampling process, conventional precision resistance sampling method cost under three-phase alternating current synchro measure environment is very high.So Current Transformer is replaced to precision resistance in this project, realizes economic volume production for next step and lay the first stone.
The sampling of three-phase phase angle and closed loop control module
The ultimate principle block diagram of phase angle sampling section as shown in Figure 3.
Two sine waveforms become square-wave signal after treatment, with rear generation phase signal, after shaping filter, be converted to again DC level, this DC level is compared with the DAC output signal of that is controlled by phase angle control word, if phase place locks, the signal of comparer output will trend towards zero volt level.
By MCU, control the output signal that ADC gathers comparer, and send phase angle control word and control FPGA and realize phase shift, form thus phase angle Control loop system.
The software algorithm of MCU adopts Smith Projection Compensation method.
Digital three phase waveform generator
The theory diagram that three-phase waveform generating unit is divided as shown in Figure 4, be mainly by FPGA module and DAC the electric circuit constitute, there is DDS module, three-phase voltage phase place and each phase current phase place by frequency and module, MUX MUX, dual-port Wave data RAM, host computer interface etc. are set form in FPGA module wherein.Be used for exporting three-phase waveform, frequency and three-phase voltage phase place and each phase current phase place can arrange respectively, also comprise the Wave data RAM of a dual-port in module, therefore can rewrite Wave data by microcomputer bus, are convenient to realize humorous wave energy.
Except above-mentioned several key modules, as the technology such as power module, signal condition module, DSP signal processing module comparative maturity all, generally there is the ready-made modular unit can be for selecting.
A) power amplifier power supply adopts AC/DC Switching Power Supply mode
The higher-order of oscillation and the noise that in order to suppress Switching Power Supply power supply, cause, must configure the Л type filter network that inductance and capacitor form.
B) sampling and the control that with sampling and the operation circuit of single channel phase angle, realize five road phase angles
Because repeat circuit is more, in order to reduce production costs, on hardware, take to complete with circuit kit the function of multi-channel sampling and control, adopt Port Multiplier scan mode.Software algorithm adopts timesharing variable period Smith Projection Compensation method to reach measuring accuracy simultaneously.
C) isolation of the electricity between three-phase output current
The sampling of employing current transformer, its signal is realized isolation by coupling scheme, has replaced original precision resistance Direct Sampling mode, improves system reliability.
The application of FPGA
FPGA internal module arranges module, MUX MUX, dual-port Wave data RAM, host computer interface etc. by frequency generation DDS module, three-phase voltage phase place and each phase current phase place and forms, jointly form waveform generation module with DAC circuit, for exporting three-phase waveform.Frequency and three-phase voltage phase place and each phase current phase place can arrange respectively, also comprise the Wave data RAM of a dual-port in module, therefore can rewrite Wave data by microcomputer bus, are convenient to realize humorous wave energy.
The present embodiment reaches following effect:
Modularization,
Device is by comprising the module compositions such as power supply, digital waveform generator, phase sample and control, power amplification, Signal Pretreatment, man-machine interaction, by certain communication mode, realize module and connect, be conducive to improve the variation of safeguarding convenience and use of system.
Modular mentality of designing, has represented the general orientation that modern instrument develops, i.e. functions of modules simplification, module variety series, module connection standard, module are safeguarded and simplified.A test macro, is comprised of several modules, and Each performs its own functions.Due to function singleness, very convenient for the fault diagnosis of system; Because kind becomes series, can select according to actual needs different accuracy ratings, range ability, envelop of function; Also due to interface standard, make the connection tolerance of intermodule larger.So the modular design of verification system is significant in this project.
The application of high speed MCU,
Main modular has high speed MCU to control, and its basic comprising is similar to embedded mini system.Be conducive to improve on the one hand the speed of inside modules data processing, complete the tasks such as inside modules self check, function operation; Also the speed and the reliability that have improved on the other hand intermodular data transmission, ensure the work of whole calibrating installation.
The application of field programmable device,
The application of FPGA and ispPAC, has realized usable range and more flexibly circuit formation widely to be similar to the pattern of standard component.The good characteristics such as the low-work voltage having with it, low-power consumption, can greatly reduce volume and the power consumption of calibrating installation.And exclusive field-programmable ability, for improving the effects such as the intelligent degree of instrument and meter and adaptive ability very obvious, can realize accurate hands-off tuning and automatic gain to control, improve antijamming capability.
Site of deployment programming device, has reduced a large amount of discrete components, has dwindled the size of circuit board, has also avoided, because of the unreasonable interference bringing to system of design on board level, having improved the reliability of calibrating installation simultaneously.The employing of programming device, cannot directly copy circuit board, for the intellecture property of protection product, has also brought into play vital role.
More than show and described ultimate principle of the present utility model, principal character and advantage of the present utility model.The technician of the industry should understand; the utility model is not subject to the restriction of above-mentioned example; that in above-mentioned example and instructions, describes just illustrates principle of the present utility model; under the prerequisite that does not depart from the utility model spirit and scope, the utility model also has various changes and modifications, and these changes and improvements all fall within the scope of claimed the utility model.The claimed scope of the utility model is defined by appending claims and equivalent thereof.
Claims (5)
1. used for intelligent electric network modularization three-phase instrument calibration device, is characterized in that, comprising:
One input interface, input interface connects a signal condition module, signal condition module connects a data analysis processing module, and data analysis processing module connects a man-machine conversation module, and man-machine conversation module connects respectively voltage current waveform control module and three-phase phase angle sampling module; Voltage current waveform control module gathers the three-phase voltage current amplitude control word of man-machine conversation module, and three-phase phase angle sampling module gathers three-phase phase control word and the frequency control word of man-machine conversation module;
One output interface, output interface connects respectively voltage current waveform control module and three-phase phase angle sampling module, between voltage current waveform control module and three-phase phase angle sampling module, be connected with three-phase waveform generation module, three-phase waveform generation module connects a power amplifier output transformer module, and power amplifier output transformer module connects output interface; Described voltage current waveform control module is carried out amplitude sampling to output interface, and described three-phase phase angle sampling module carries out phase sample to output interface; Three-phase waveform generation module gathers the three-phase voltage current amplitude signal of voltage current waveform control module, and three-phase waveform generation module gathers phase control words and the frequency control word of three-phase phase angle sampling module.
2. used for intelligent electric network modularization three-phase instrument calibration device according to claim 1, is characterized in that, the main control chip of voltage current waveform control module intends adopting STC89C51 series processors.
3. used for intelligent electric network modularization three-phase instrument calibration device according to claim 1, it is characterized in that, three-phase phase angle sampling module becomes square-wave signal after treatment by two sine waveforms, with rear generation phase signal, after shaping filter, be converted to again DC level, this DC level is compared with the DAC output signal of that is controlled by phase angle control word, if phase place locks, the signal of comparer output will trend towards zero volt level.
4. used for intelligent electric network modularization three-phase instrument calibration device according to claim 3, it is characterized in that, three-phase waveform generation module, by FPGA module and DAC the electric circuit constitute, there is DDS module, three-phase voltage phase place and each phase current phase place by frequency and module, MUX MUX, dual-port Wave data RAM, host computer interface are set form in FPGA module wherein.
5. used for intelligent electric network modularization three-phase instrument calibration device according to claim 1, is characterized in that, power amplifier power supply adopts AC/DC Switching Power Supply.
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| CN201320464777.4U CN203535207U (en) | 2013-07-31 | 2013-07-31 | Modularized three-phase instrument calibrating device for smart grid |
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| CN201320464777.4U CN203535207U (en) | 2013-07-31 | 2013-07-31 | Modularized three-phase instrument calibrating device for smart grid |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103383443A (en) * | 2013-07-31 | 2013-11-06 | 上海仪器仪表研究所 | Modularized three-phase instrument calibrating device for smart grid |
| CN116577536A (en) * | 2023-07-10 | 2023-08-11 | 烟台东方威思顿电气有限公司 | Three-phase alternating current standard source based on waveform-amplitude separation control |
-
2013
- 2013-07-31 CN CN201320464777.4U patent/CN203535207U/en not_active Withdrawn - After Issue
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103383443A (en) * | 2013-07-31 | 2013-11-06 | 上海仪器仪表研究所 | Modularized three-phase instrument calibrating device for smart grid |
| CN103383443B (en) * | 2013-07-31 | 2015-10-28 | 上海仪器仪表研究所 | Modularization three-phase instrument calibration device used for intelligent electric network |
| CN116577536A (en) * | 2023-07-10 | 2023-08-11 | 烟台东方威思顿电气有限公司 | Three-phase alternating current standard source based on waveform-amplitude separation control |
| CN116577536B (en) * | 2023-07-10 | 2023-09-15 | 烟台东方威思顿电气有限公司 | Three-phase alternating current standard source based on waveform-amplitude separation control |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20140409 Effective date of abandoning: 20151028 |
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| C25 | Abandonment of patent right or utility model to avoid double patenting |