CN103454490A - Intelligent metering system and intelligent metering method on basis of Blackman-harris window spectrum correction - Google Patents
Intelligent metering system and intelligent metering method on basis of Blackman-harris window spectrum correction Download PDFInfo
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Abstract
The invention relates to an intelligent metering system and an intelligent metering method on the basis of Blackman-harris window spectrum correction. The intelligent metering method includes (1), conditioning signals, in other words, transmitting voltage and current analog signals in a power grid system into a special six-channel synchronization metering chip via a resistance voltage dividing network and a CT (current transformer) resistance sampling network; (2), processing data, in other words, correcting ADC (analog to digital conversion) digital values by means of digital low-pass filtering, direct-current offset correction and ratio error and angle error correction, and then performing windowing FFT (fast Fourier transform) processing on the signals by the aid of a Blackman-harris window; (3), managing the data by the aid of an MCU (microprogrammed control unit) chip and a peripheral circuit, managing fundamental waves, various harmonic quantities, dividing time frames and realizing multiple functions on the basis of an MCU which is used as a core, and displaying harmonic bar analysis charts by the aid of a graphical lattice liquid crystal display. The intelligent metering system and the intelligent metering method have the advantage that functions of high-order harmonic analysis and electric energy metering with high accuracy can be realized for intelligent energy meters.
Description
Technical field
The invention belongs to the electric-power metering technical field, be specifically related to a kind of based on Blackman-harris, the intelligent measuring system of window Spectrum Correction and method, i.e. a kind of intelligent measuring system and method based on the Blackman-Harris window Spectrum Correction.
Background technology
Along with Chinese society's power consumption increases rapidly, State Grid Corporation of China proposes the target of " building strong intelligent power network ", the national grid relevant criterion such as Q/GDW 356-2009 " three-phase intelligent electric-energy meter pattern standard ", Q/GDW 357-2009 " 0.2S level three-phase intelligent electric-energy meter technical manual " that release one after another, intelligent electric meter is proposed to higher technical requirement, from traditional general function type to high precision, at times, the future development of the high-tech content such as multi-functional and high added value.Simultaneously, non-linear equipment is used widely in electric system, the harmonic problem brought thus is on the rise to power system security, threat stable, that economical operation forms, and fundamental energy metering, harmonic electric energy metering in intelligent electric meter are more and more paid attention to by the user.
The detection technique of first-harmonic, harmonic wave generally has: (1) FFT method based on frequency-domain analysis, and while being characterized in the mains frequency fluctuation, accuracy of detection is lower; (2) the humorous wave method of filter detection, be characterized in being difficult to obtain the ideal frequency characteristic; (3) method based on instantaneous reactive power theory, be characterized in that calculated amount is large, processes complicated; (4) method based on neural network theory and wavelet transformation, be characterized in that calculated amount is large, is difficult to realize in embedded system.
First-harmonic based on FFT, algorithm of harmonics analysis, be easy to the digital signal processor at DSP() the upper realization is current most widely used a kind of harmonic analysis method.In electric system, line voltage, current distortion cause fundamental frequency to change, and because non-synchronous sampling causes fft algorithm, have the problems such as spectral leakage and fence effect, and the precision that makes first-harmonic and harmonic wave detect is affected.In the spectral leakage of minimizing fft algorithm and fence effect impact, raising electrical measurement, first-harmonic and each harmonic wave accuracy of detection are the difficult problems in electric measurement signal analysis and Power quality management.
The existing patent document that relates to the harmonic wave metering comprises " method and the measuring instrument of measuring factory harmonic wave " (200310105446.2), " method and the gauge of metering factory harmonic wave " (200310105446.2), " Harmonious Waves in Power Systems measuring fixed amount method and gauge " (98110414.2), etc.The purpose of its invention is the dynamic perfromance that Harmonic in Power System voltage, electric current are measured in accurate quantification ground.The weak point of prior art is: prior art provides the electrical equipment method for designing of some first-harmonics and harmonic measure, but there is the features such as diversity, randomness and polymorphism due to harmonic wave, spectral leakage and fence effect that the fundamental frequency fluctuation causes still exist, and have larger error when facing when weak signal extraction or sophisticated signal are analyzed, therefore real-time, high-precision first-harmonic and harmonic measure analysis are difficult to realize.
Summary of the invention
For overcoming the deficiency of prior art, the invention provides a kind of intelligent measuring system and method based on Blackman-harris window Spectrum Correction, be a kind of intelligent measuring system and method based on the Blackman-Harris window Spectrum Correction, realize that the metering of pin-point accuracy harmonic wave, multiple harmonic parametric statistics reach at times with analysis, multi-functional technical scheme.
The technical solution used in the present invention is:
Intelligent measuring system based on the Blackman-Harris window Spectrum Correction of the present invention, comprise line voltage current transformer, resistance pressure-dividing network and CT resistance sampling network, signal condition the special metering IC, DSP data processor, data management special chip MCU and peripheral circuit real-time clock thereof, FRAM and the FLASH storer, communication interface, the graphic dot matrix liquid crystal that connect successively.
In technique scheme, the special metering IC adopts special-purpose SPORT mouth to be connected with dsp processor, dsp processor and MCU chip adopt asynchronous serial bus UART mouth to be connected, and the MCU chip exterior connects simultaneously and controls real-time clock, FRAM and FLASH storer, communication interface circuit, graphic dot matrix liquid crystal.
In technique scheme, described the special metering IC is 6 Channel Synchronous sampling the special metering ICs, and model is TDK6513H.
In technique scheme, described DSP data processor chip model is TMS320VC5502.
In technique scheme, described data management special chip MCU model is M30624FGPFP.
Intelligent metering method based on the Blackman-Harris window Spectrum Correction of the present invention is:
(1) signal condition, the electric current and voltage simulating signal that is 220V or 1.5A by ratings in network system, by resistance pressure-dividing network and CT resistance sampling network, the ac small signal of become≤250mV is sent into the 6 Channel Synchronous sampling the special metering ICs with original ADC translation data output;
(2) data are processed, sampled data is sent into the DSP data processing section by the computation chip special purpose interface, ADC converting digital amount is after digital low-pass filtering, DC offset correction, ratio and angular difference are proofreaied and correct, adopt the Blackman-harris window to carry out the windowing FFT processing to signal, use double spectral line interpolation and Polynomial Fitting Technique to detect first-harmonic and each harmonic content in measured signal.
(3) data management, comprise MCU chip, real-time clock, FRAM and FLASH storer, communication interface circuit, graphic dot matrix liquid crystal, by MCU be hard core control first-harmonic, each harmonic content and realize at times, multi-functional, adopt graphical lattice lcd to show harmonic wave column analysis chart.
Principle of work:
In intelligent measuring system based on Blackman-harris window Spectrum Correction, the special metering IC adopts special-purpose SPORT mouth to be connected with dsp processor, dsp processor adopts asynchronous serial bus UART mouth to be connected with the MCU chip, the MCU chip exterior connects real-time clock, FRAM and FLASH storer, communication interface circuit, graphic dot matrix liquid crystal simultaneously, by the MCU chip controls, is finished the work.
The Blackman-harris window that intelligent measuring system based on Blackman-harris window Spectrum Correction is selected is extracted by weak signal or the sophisticated signal analysis has good performance, in the non-synchronous sampling situation, the FFT computing of not windowing will exist serious spectral leakage and fence effect, accuracy of detection is low, the spectral leakage and the fence effect that add Blackman-harris window double spectral line interpolation FFT algorithm can significantly reduce, can effectively improve first-harmonic and harmonic wave accuracy of detection, and calculated amount is very low, design realizes conveniently.
Intelligent measuring system based on Blackman-harris window Spectrum Correction, the double spectral line interpolation FFT algorithm adopted refers in the non-synchronous sampling situation, there are deviation in discrete spectral line and actual frequency spectral line, by finding near two peak value spectral lines of actual frequency point, adopt the method for fitting of a polynomial, obtain practical interpolation expressions, ask for thus frequency values, amplitude and the initial phase at true spectral line place.
The invention has the beneficial effects as follows, the done with high accuracy of set high-performance the special metering IC and the data processing function of high-speed dsp, optimized algorithm based on Blackman-harris window Spectrum Correction, realize frequency analysis and the electric energy metrical of pin-point accuracy more of the more high order of intelligent electric meter.
The accompanying drawing explanation
Fig. 1 is theory diagram of the present invention;
Fig. 2 is signal condition partial circuit figure;
Fig. 3 is of the present invention based on Blackman-harris window spectrum correcting method schematic diagram.
Embodiment
Theory diagram of the present invention, as Fig. 1, comprises the special metering IC, dsp processor, single-chip microcomputer and each peripheral circuit.The special metering IC is selected the TDK6513H with ADC raw data output channel synchronized sampling, and dsp processor selects TMS320VC5502, single-chip microcomputer to select M30624FGPFP, and it is 21 times that harmonic wave detects high reps.
Signal condition partial circuit figure of the present invention is shown in Fig. 2, and three phase network voltage, current analog signal carry out signal condition, the ac small signal of obtain≤250mV through resistance pressure-dividing network and CT resistance sampling network respectively.The RC low-pass filter that the rear class access parameter is identical (by frequency 1591Hz, meeting 21 subharmonic samplings), keep the phase differential between sampling front and back voltage, electric current consistent.CT rear end access switching diode 1SS123 amplitude limit, prevent the excessive damage device of Current Transmit primary side current.
Voltage and current signal after sampling and temperature signal and monitoring voltage input signal sequentially are input to the ADC sampling input end of TDK6513H through multiplexer MUX.TDK6513H carries high precision band gap+1.195V reference voltage V
rEF, its temperature coefficient<10ppm/ ℃, guarantee that sample circuit has higher precision and thermal stability.
Deliver to the TMS320VC5502 data processing unit by the special-purpose SPORT interface of TDK6513H after sampled data A/D conversion (analog to digital conversion), after digital low-pass filtering, DC offset correction, ratio and angular difference are proofreaied and correct, complete and build discrete Blackman-harris window by TMS320VC5502, added window double spectral line interpolation FFT and processed, obtained the each harmonic parameter.
Claims (6)
1. the intelligent measuring system based on the Blackman-Harris window Spectrum Correction, is characterized in that: comprise line voltage current transformer, resistance pressure-dividing network and CT resistance sampling network, signal condition the special metering IC, DSP data processor, data management special chip MCU and peripheral circuit real-time clock thereof, FRAM and the FLASH storer, communication interface, the graphic dot matrix liquid crystal that connect successively.
2. the intelligent measuring system based on the Blackman-Harris window Spectrum Correction according to claim 1, it is characterized in that: the special metering IC adopts special-purpose SPORT mouth to be connected with dsp processor, dsp processor and MCU chip adopt asynchronous serial bus UART mouth to be connected, and the MCU chip exterior connects simultaneously and controls real-time clock, FRAM and FLASH storer, communication interface circuit, graphic dot matrix liquid crystal.
3. the intelligent measuring system based on the Blackman-Harris window Spectrum Correction according to claim 1 is characterized in that: the signal condition the special metering IC is 6 Channel Synchronous sampling the special metering ICs, and model is TDK6513H.
4. the intelligent measuring system based on the Blackman-Harris window Spectrum Correction according to claim 1, it is characterized in that: described DSP data processor chip model is TMS320VC5502.
5. the intelligent measuring system based on the Blackman-Harris window Spectrum Correction according to claim 1, it is characterized in that: described data management special chip MCU model is M30624FGPFP.
6. the intelligent metering method based on the Blackman-Harris window Spectrum Correction is characterized in that:
(1) signal condition, the electric current and voltage simulating signal that is 220V or 1.5A by ratings in network system, by resistance pressure-dividing network and CT resistance sampling network, the ac small signal of become≤250mV is sent into the 6 Channel Synchronous sampling the special metering ICs with original ADC translation data output;
(2) data are processed, sampled data is sent into the DSP data processing section by the computation chip special purpose interface, ADC converting digital amount is after digital low-pass filtering, DC offset correction, ratio and angular difference are proofreaied and correct, adopt the Blackman-harris window to carry out the windowing FFT processing to signal, use double spectral line interpolation and Polynomial Fitting Technique to detect first-harmonic and each harmonic content in measured signal;
(3) data management, comprise MCU chip, real-time clock, FRAM and FLASH storer, communication interface circuit, graphic dot matrix liquid crystal, by MCU be hard core control first-harmonic, each harmonic content and realize at times, multi-functional, adopt graphical lattice lcd to show harmonic wave column analysis chart.
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103926476A (en) * | 2014-04-10 | 2014-07-16 | 宁波恒力达科技有限公司 | Three-phase imbalance detection method based on FFT and symmetrical component method and inverter |
| CN104569586A (en) * | 2014-11-22 | 2015-04-29 | 安徽国电京润电力科技有限公司 | High-precision phase difference measuring method based on CRIO platform |
| CN107450421A (en) * | 2017-10-10 | 2017-12-08 | 南昌市永峰科技有限公司 | A kind of multi-functional logical process system and its method for operation |
| CN109655665A (en) * | 2018-12-29 | 2019-04-19 | 国网安徽省电力有限公司 | All phase Fourier's harmonic analysis method based on Blackman window |
| CN111693775A (en) * | 2020-05-06 | 2020-09-22 | 南方电网科学研究院有限责任公司 | Harmonic detection method, device and medium for power transmission network |
| CN112098712A (en) * | 2020-07-28 | 2020-12-18 | 宁波三星医疗电气股份有限公司 | Electricity larceny prevention method |
| CN112834820A (en) * | 2021-04-09 | 2021-05-25 | 杭州万高科技股份有限公司 | Electric energy meter and metering device thereof |
| CN113625048A (en) * | 2021-08-19 | 2021-11-09 | 杭州万高科技股份有限公司 | Smart electric meter chip and smart electric meter |
| CN114200381A (en) * | 2021-12-10 | 2022-03-18 | 清湖光旭数据科技(北京)有限公司 | System and method for detecting reliability of intelligent electric meter |
| CN115308485A (en) * | 2022-07-29 | 2022-11-08 | 中国科学院紫金山天文台 | Digital sideband separation spectral line receiving device and using method thereof |
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Cited By (11)
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| CN103926476A (en) * | 2014-04-10 | 2014-07-16 | 宁波恒力达科技有限公司 | Three-phase imbalance detection method based on FFT and symmetrical component method and inverter |
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| CN107450421A (en) * | 2017-10-10 | 2017-12-08 | 南昌市永峰科技有限公司 | A kind of multi-functional logical process system and its method for operation |
| CN109655665A (en) * | 2018-12-29 | 2019-04-19 | 国网安徽省电力有限公司 | All phase Fourier's harmonic analysis method based on Blackman window |
| CN111693775A (en) * | 2020-05-06 | 2020-09-22 | 南方电网科学研究院有限责任公司 | Harmonic detection method, device and medium for power transmission network |
| CN112098712A (en) * | 2020-07-28 | 2020-12-18 | 宁波三星医疗电气股份有限公司 | Electricity larceny prevention method |
| CN112834820A (en) * | 2021-04-09 | 2021-05-25 | 杭州万高科技股份有限公司 | Electric energy meter and metering device thereof |
| CN112834820B (en) * | 2021-04-09 | 2024-01-23 | 杭州万高科技股份有限公司 | Electric energy meter and metering device thereof |
| CN113625048A (en) * | 2021-08-19 | 2021-11-09 | 杭州万高科技股份有限公司 | Smart electric meter chip and smart electric meter |
| CN114200381A (en) * | 2021-12-10 | 2022-03-18 | 清湖光旭数据科技(北京)有限公司 | System and method for detecting reliability of intelligent electric meter |
| CN115308485A (en) * | 2022-07-29 | 2022-11-08 | 中国科学院紫金山天文台 | Digital sideband separation spectral line receiving device and using method thereof |
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Application publication date: 20131218 |