CN202631630U - Novel intelligent electric energy meter based on spectrum correction of Blackman-Harris window - Google Patents
Novel intelligent electric energy meter based on spectrum correction of Blackman-Harris window Download PDFInfo
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- CN202631630U CN202631630U CN 201220244024 CN201220244024U CN202631630U CN 202631630 U CN202631630 U CN 202631630U CN 201220244024 CN201220244024 CN 201220244024 CN 201220244024 U CN201220244024 U CN 201220244024U CN 202631630 U CN202631630 U CN 202631630U
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Abstract
The utility model relates to a novel intelligent electric energy meter based on the spectrum correction of a Blackman-Harris window. The novel intelligent electric energy meter comprises a signal conditioning part (1), a data processing part (2) and a data management part (3), wherein the signal conditioning part sends a voltage current analog signal in a power grid system to a six-channel synchronization special metering chip through a resistor voltage-dividing network and a computed tomography (CT) resistor sampling network; after digital quantity which is converted by an analog to digital converter (ADC) is subjected to digital low-pass filtering, direct-current bias correction and ratio error and phase error correction, a signal is subjected to windowing fast Fourier transformation (FFT) processing by using the Blackman-Harris window; the data management part comprises a micro control unit (MCU) chip and a peripheral circuit; an MCU serves as a core to manage fundamental wave and each harmonic quantity, and time division and multi-functionality are realized; and by adoption of a graphical lattice liquid crystal display harmonic columnar analysis chart, the high-order harmonic analysis and high-accuracy electric energy metering of the intelligent electric energy meter are realized.
Description
Technical field
The utility model belongs to the electric-power metering technical field, is specifically related to a kind of novel intelligent electric energy meter of proofreading and correct based on Blackman-harris window frequency spectrum, promptly a kind of novel intelligent electric energy meter of proofreading and correct based on Blacknam-Harris's window frequency spectrum.
Background technology
Along with Chinese society's power consumption increases rapidly; State Grid Corporation of China proposes the target of " building strong intelligent electrical network "; National grid release one after another Q/GDW 356-2009 " three-phase intelligent electric energy meter pattern standard ", Q/GDW 357-2009 relevant criterion such as " 0.2S level three-phase intelligent electric energy meter technical manuals "; Intelligent electric meter is proposed higher technical requirement, from the conventional general functional form to high precision, at times, the direction of high-tech content such as multi-functional and high added value develops.Simultaneously; Non-linear equipment is used widely in electric system; The harmonic problem that brings thus is on the rise to power system security, threat stable, that economical operation constitutes, and fundamental energy metering, harmonic electric energy metering in the intelligent electric meter are more and more paid attention to by the user.
The detection technique of first-harmonic, harmonic wave generally has: (1) based on the FFT method of frequency-domain analysis, when being characterized in the mains frequency fluctuation, accuracy of detection is lower; (2) the humorous wave method of filter detection is characterized in being difficult to obtain the ideal frequency characteristic; (3), be characterized in that calculated amount is big, dealing with complicated based on the method for instantaneous reactive power theory; (4) based on neural network theory and method of wavelet, be characterized in that calculated amount is big, be difficult in embedded system, realize.
Based on first-harmonic, the algorithm of harmonics analysis of FFT, be easy to go up realization at DSP (digital signal processor), be current most widely used a kind of harmonic analysis method.In electric system, line voltage, current distortion cause fundamental frequency to change, because non-synchronous sampling causes fft algorithm to have problems such as spectral leakage and fence effect, the precision that makes first-harmonic and harmonic wave detect is affected.First-harmonic and each harmonic wave accuracy of detection are the difficult problems in electric measurement signal analysis and the quality of power supply management in the spectral leakage of minimizing fft algorithm and fence effect influence, the raising electrical measurement.
The existing patent document that relates to the harmonic wave metering comprises " method of measuring factory harmonic wave and measuring instrument " (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 voltage, electric current in the electric system 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 because harmonic wave has characteristics such as diversity, randomness and polymorphism; Spectral leakage and fence effect that the fundamental frequency fluctuation causes still exist; And exist than mistake when weak signal extraction or sophisticated signal are analyzed when facing, 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 utility model provides a kind of novel intelligent electric energy meter of proofreading and correct based on Blackman-harris window frequency spectrum, and promptly a kind of novel intelligent electric energy meter of proofreading and correct based on Blacknam-Harris's window frequency spectrum is realized pin-point accuracy
Harmonic wave metering, multiple harmonic parametric statistics reach at times with analysis, multi-functional technical scheme.
The technical scheme that the utility model adopts is:
The novel intelligent electric energy meter of proofreading and correct based on Blacknam-Harris's window frequency spectrum of the utility model comprises the resistance pressure-dividing network and CT resistance sampling network, signal condition special use computation chip, DSP data processor, data management special chip MCU and peripheral circuit real-time clock, FRAM and FLASH storer, communication interface, graphic dot matrix liquid crystal that connect successively.
In the technique scheme; Special-purpose computation chip adopts special-purpose SPORT mouth to link to each other with dsp processor; Dsp processor and MCU chip adopt asynchronous serial bus UART mouth to link to each other, 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 the technique scheme, described special-purpose computation chip is the special-purpose computation chips of 6 passage synchronized samplings, and model is TDK6513H.
In the technique scheme, described DSP data processor chip model is TMS320VC5502.
In the technique scheme, described data management special chip MCU model is M30624FGPFP.
The novel intelligent electric energy meter based on the correction of Blackman-harris window frequency spectrum of the utility model, mainly form by three parts:
(1) signal condition part; With ratings in the network system is the electric current and voltage simulating signal of 220V or 1.5A; Through resistance pressure-dividing network and CT resistance sampling network, become≤ac small signal of 250mV is sent into has the special-purpose computation chip of 6 passage synchronized samplings that original ADC translation data is exported;
(2) data processing section; Sampled data is sent into the DSP data processing section through the computation chip special purpose interface; After ADC converting digital amount is proofreaied and correct through digital low-pass filtering, DC offset correction, ratio and angular difference; Adopt the Blackman-harris window that signal is carried out windowing FFT and handle the first-harmonic in utilization double spectral line interpolation and the measured signal of fitting of a polynomial technology for detection and each harmonic content;
(3) data management part; 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
The intelligent electric energy meter special secondary school of proofreading and correct based on Blackman-harris window frequency spectrum adopts special-purpose SPORT mouth to link to each other with computation chip and dsp processor; Dsp processor adopts asynchronous serial bus UART mouth to link to each other 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, is finished the work by the MCU chip controls.
The Blackman-harris window of selecting for use based on the intelligent electric energy meter of Blackman-harris window frequency spectrum correction has good performance to weak signal extraction or sophisticated signal analysis; Under 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, and can effectively improve first-harmonic and harmonic wave accuracy of detection, and calculated amount is very low, design realizes conveniently.
Intelligent electric energy meter based on the correction of Blackman-harris window frequency spectrum; The double spectral line interpolation FFT algorithm that adopts is meant under the non-synchronous sampling situation; There are deviation in discrete spectral line and actual frequency spectral line, through seeking near two peak value spectral lines of actual frequency point, adopt the method for fitting of a polynomial; Obtain practical interpolation expressions, ask for frequency values, amplitude and the initial phase at true spectral line place thus.
The beneficial effect of the utility model is; The done with high accuracy of the special-purpose computation chip of set high-performance and the data processing function of high-speed dsp; Based on the optimized Algorithm that Blackman-harris window frequency spectrum is proofreaied and correct, realize the frequency analysis and the electric energy metrical of pin-point accuracy more of the more high order of intelligent electric meter.
Description of drawings
Fig. 1 is the theory diagram of the utility model;
Fig. 2 is signal condition partial circuit figure;
Fig. 3 be the utility model based on Blackman-harris window spectrum correcting method synoptic diagram.
Embodiment
The theory diagram of the utility model such as Fig. 1 comprise special-purpose computation chip, dsp processor, single-chip microcomputer and each peripheral circuit.Special-purpose computation chip is selected the TDK6513H with ADC raw data output channel synchronized sampling for use, and dsp processor selects for use TMS320VC5502, single-chip microcomputer to select M30624FGPFP for use, and it is 21 times that harmonic wave detects high reps.
The novel signal condition partial circuit figure of this test sees Fig. 2, and three phase network voltage, current analog signal carry out signal condition through resistance pressure-dividing network and CT resistance sampling network respectively, obtains≤ac small signal of 250mV.The RC low-pass filter that back level access parameter is identical (by frequency 1591Hz, satisfying the sampling of 21 subharmonic), the phase differential before and after the maintenance sampling between voltage, electric current is consistent.Switching diode 1SS123 amplitude limit is inserted in the CT rear end, prevents the excessive damage device of current transformer CT primary side current.Voltage and current signal after will taking a sample again and temperature signal and monitoring voltage input signal are input to the ADC sampling input end of TDK6513H in proper order 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.
The TMS320VC5502 data processing unit is delivered to through the special-purpose SPORT interface of TDK6513H in sampled data A/D conversion (analog to digital conversion) back; After digital low-pass filtering, DC offset correction, ratio and angular difference correction; Accomplish the discrete Blackman-harris window of structure by TMS320VC5502; Add window double spectral line interpolation FFT and handle, obtain the each harmonic parameter.
Claims (5)
1. a novel intelligent electric energy meter of proofreading and correct based on Blacknam-Harris's window frequency spectrum is characterized in that: comprise the resistance pressure-dividing network and CT resistance sampling network, signal condition special use computation chip, DSP data processor, data management special chip MCU and peripheral circuit real-time clock, FRAM and FLASH storer, communication interface, graphic dot matrix liquid crystal that connect successively.
2. the novel intelligent electric energy meter of proofreading and correct based on Blacknam-Harris's window frequency spectrum according to claim 1; It is characterized in that: special-purpose computation chip adopts special-purpose SPORT mouth to link to each other with dsp processor; Dsp processor and MCU chip adopt asynchronous serial bus UART mouth to link to each other, 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 novel intelligent electric energy meter of proofreading and correct based on Blacknam-Harris's window frequency spectrum according to claim 1 is characterized in that: described special-purpose computation chip is the special-purpose computation chips of 6 passage synchronized samplings, and model is TDK6513H.
4. the novel intelligent electric energy meter of proofreading and correct based on Blacknam-Harris's window frequency spectrum according to claim 1, it is characterized in that: described DSP data processor chip model is TMS320VC5502.
5. the novel intelligent electric energy meter of proofreading and correct based on Blacknam-Harris's window frequency spectrum according to claim 1, it is characterized in that: described data management special chip MCU model is M30624FGPFP.
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| CN 201220244024 CN202631630U (en) | 2012-05-28 | 2012-05-28 | Novel intelligent electric energy meter based on spectrum correction of Blackman-Harris window |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103105532A (en) * | 2013-01-22 | 2013-05-15 | 广西电网公司电力科学研究院 | Harmonic electric energy measuring system of improved Fourier transform and control method thereof |
| CN103105529A (en) * | 2013-01-22 | 2013-05-15 | 广西电网公司电力科学研究院 | Harmonic wave electric energy measuring system based on parameter analysis and control method thereof |
| CN103454497A (en) * | 2013-09-10 | 2013-12-18 | 南京理工大学 | Phase difference measuring method based on improved windowing discrete Fourier transform |
| CN109324225A (en) * | 2018-11-15 | 2019-02-12 | 国网山东省电力公司电力科学研究院 | A kind of high-precision current sampling system for CVT on-line monitoring |
| CN116148754A (en) * | 2023-04-18 | 2023-05-23 | 石家庄科林电气股份有限公司 | Electric energy meter adjusting method and device and electronic equipment |
-
2012
- 2012-05-28 CN CN 201220244024 patent/CN202631630U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103105532A (en) * | 2013-01-22 | 2013-05-15 | 广西电网公司电力科学研究院 | Harmonic electric energy measuring system of improved Fourier transform and control method thereof |
| CN103105529A (en) * | 2013-01-22 | 2013-05-15 | 广西电网公司电力科学研究院 | Harmonic wave electric energy measuring system based on parameter analysis and control method thereof |
| CN103454497A (en) * | 2013-09-10 | 2013-12-18 | 南京理工大学 | Phase difference measuring method based on improved windowing discrete Fourier transform |
| CN103454497B (en) * | 2013-09-10 | 2016-09-21 | 南京理工大学 | Based on the method for measuring phase difference improving windowed DFT |
| CN109324225A (en) * | 2018-11-15 | 2019-02-12 | 国网山东省电力公司电力科学研究院 | A kind of high-precision current sampling system for CVT on-line monitoring |
| CN116148754A (en) * | 2023-04-18 | 2023-05-23 | 石家庄科林电气股份有限公司 | Electric energy meter adjusting method and device and electronic equipment |
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