CN109283386A - A kind of harmonic electric energy meter based on ADC Yu three spectral line interpolation FFT of Rife-Vincent window - Google Patents
A kind of harmonic electric energy meter based on ADC Yu three spectral line interpolation FFT of Rife-Vincent window Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R22/00—Arrangements for measuring time integral of electric power or current, e.g. electricity meters
- G01R22/06—Arrangements for measuring time integral of electric power or current, e.g. electricity meters by electronic methods
- G01R22/10—Arrangements for measuring time integral of electric power or current, e.g. electricity meters by electronic methods using digital techniques
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R23/00—Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
- G01R23/16—Spectrum analysis; Fourier analysis
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R23/00—Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
- G01R23/16—Spectrum analysis; Fourier analysis
- G01R23/165—Spectrum analysis; Fourier analysis using filters
- G01R23/167—Spectrum analysis; Fourier analysis using filters with digital filters
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Abstract
A kind of harmonic electric energy meter based on ADC Yu three spectral line interpolation FFT of Rife-Vincent window, the harmonic electric energy meter include signal condition part, data processing section and data administrative section.The signal condition part, including ADC converter, resistance pressure-dividing network and CT resistance sampling network；The data processing section, including dsp processor；The data management part, including MCU chip, real-time clock, SDRAM and FLASH memory, communication interface circuit, graphic dot matrix liquid crystal.The present invention is not limited by the special metering IC performance and function, can be based on self-developed excellent algorithm, be measured to accurate quantification the dynamic characteristic of Harmonic in Power System voltage, electric current, realize the frequency analysis of more high order and the electrical energy measurement of more high accuracy.
Description
Technical field
The present invention relates to a kind of harmonic electric energy meter based on ADC Yu three spectral line interpolation FFT of Rife-Vincent window belongs to electric energy
Table technical field.
Background technique
With the development of power electronics technology, non-linear equipment is used widely in the power system, non-linear equipment
The threat that bring harmonic problem constitutes power system security, stabilization, economical operation is on the rise.Fundamental wave and harmonic wave it is accurate
Measurement can provide section for power grid electrical energy measurement, harmonic flow calculation, equipment networking detection, Harmonic Current Compensating In Electric Power System and inhibition etc.
Learn foundation.
Fundamental wave generally has with harmonic component detection technique: (1) the FFT method based on frequency-domain analysis, its main feature is that power grid frequency
When rate fluctuates, detection accuracy is lower；(2) filter detection harmonic wave method, its main feature is that being difficult to obtain ideal frequency characteristic；(3)
Method based on instantaneous reactive power theory, its main feature is that computationally intensive, processing is complicated；(4) based on neural network theory and small
The method of wave conversion, its main feature is that computationally intensive, it is difficult to realize in embedded systems.
Fundamental wave, algorithm of harmonics analysis based on FFT are easy to realize on DSP (digital signal processor), are to apply now
A kind of widest harmonic analysis method.In the power system, network voltage, current distortion cause fundamental frequency to change, due to
The problems such as non-synchronous sampling causes fft algorithm there are spectral leakage and fence effects so that the precision of fundamental wave and harmonic detecting by
To influence.The spectral leakage and fence effect for reducing fft algorithm influence, improve fundamental wave and each harmonic detecting precision in electrical measurement
Problem in electric measurement signal analysis and Power quality management.
Existing patent document publication number CN1611953 discloses " method and measuring instrument of measurement factory harmonic wave "；Publication number
CN1245897 discloses " Harmonious Waves in Power Systems measuring fixed amount method and gauge "；Notification number CN2798102 discloses " electric power
Line higher hamonic wave analyzes gauge "；Notification number CN101701985 discloses " constant-frequency variable dot power grid harmonic wave detection method and its survey
Measure instrument ".Its purpose invented be accurate quantification measure the dynamic characteristic of Harmonic in Power System voltage, electric current.Prior art
Shortcoming be: prior art provides the electrical equipment design method of some fundamental waves and harmonic measure, but since harmonic wave has
Spectral leakage caused by having the features such as diversity, randomness and polymorphism, fundamental frequency to fluctuate and fence effect still remain, because
This real-time, high-precision fundamental wave and harmonic measure analysis are difficult to realize.
Summary of the invention
The object of the present invention is to which in view of the problems of the existing technology, the present invention discloses a kind of based on ADC and Rife-
The harmonic electric energy meter of three spectral line interpolation FFT of Vincent window.
The technical solution that the present invention realizes is as follows, a kind of based on ADC and three spectral line interpolation FFT of Rife-Vincent window
Harmonic electric energy meter, including signal condition part, data processing section and data administrative section.
The signal condition part, including ADC converter, resistance pressure-dividing network and CT resistance sampling network；Signal condition
The current voltage analog signal that rated value in system is 220V and 1.5A by part, passes through resistance pressure-dividing network and CT resistance sampling net
Network, become≤AC signal of 2.5V is sent into 8 Channel Synchronous sampling ADCs of high-precision.
The data processing section, including dsp processor；Sampled data is sent into DSP data by special purpose interface SPI interface
Handle part, it is narrow by main lobe, secondary lobe is low and fall fireballing Rife-Vincent window to signal carry out adding window, direct computation of DFT
Leaf transformation, three spectral line interpolation FFT calculation process, Polynomial Fitting Technique detect fundamental wave and each harmonic content in measured signal, meter
Calculate frequency, amplitude, phase, power, the parameters such as percent harmonic distortion, and will treated that data are sent to MCU is stored, led to
The processing such as letter and display.
The data management part, including MCU chip, real-time clock, SDRAM and FLASH memory, communication interface electricity
Road, graphic dot matrix liquid crystal are hard core control fundamental wave and each harmonic content by MCU, using graphical Dot-Matric LCD Display harmonic wave column
Analysis chart.
The ADC converter is connected with dsp processor using dedicated SPI interface；Dsp processor and MCU chip are using different
Universal serial bus UART port is walked to be connected；Real-time clock, SDRAM and FLASH memory, communication interface are connected outside MCU chip simultaneously
Circuit, graphic dot matrix liquid crystal are controlled by MCU chip and complete work.
The chip model of the 8 Channel Synchronous sampling ADC converter of high-precision is ADS1278.
The chip model of the dsp processor is TMS320VC5502.
The MCU chip model MSP430F449, harmonic detecting highest number are 50 times.
Working principle of the present invention is as follows: the harmonic electric energy based on ADC Yu three spectral line interpolation FFT of Rife-Vincent window
ADC converter is connected with dsp processor using dedicated SPI interface in table, and dsp processor and MCU chip are total using asynchronous serial
The connection of line UART interface, connected outside MCU chip simultaneously real-time clock, SDRAM and FLASH memory, communication interface circuit,
Graphic dot matrix liquid crystal is controlled by MCU chip and completes work.
The ADC that harmonic electric energy meter based on ADC and three spectral line interpolation FFT of Rife-Vincent window is selected is raw for TI company
The ADS1278 of production, ADS1278 be it is a have 8 channels, 24, the up to high-precision of 144KHz sample rate, high-performance modulus turn
Parallel operation, is highly suitable for harmonic electric energy data collection system high, low in energy consumption to performance requirement, more than analog channel, and Rife-
Vincent window is the cosine combination window function that a kind of main lobe is narrow, side lobe performance is excellent, in non-synchronous sampling, not adding window
FFT operation serious spectral leakage and fence effect will be present, detection accuracy is low, adds three spectral line interpolation of Rife-Vincent window
The spectral leakage and fence effect of fft algorithm can significantly reduce, and can effectively improve fundamental wave and harmonic detecting precision, and design and realize
Flexibly.
Based on the harmonic electric energy meter of three spectral line interpolation FFT of Rife-Vincent window, three spectral line interpolation FFT algorithms of use
Refer in non-synchronous sampling, there are deviations for discrete spectral line and actual frequency spectral line, by finding near actual frequency point
Three peak value spectral lines practical interpolation expressions are found out using the method for fitting of a polynomial, thus seek at true spectral line
Frequency values, amplitude and initial phase.
The invention has the advantages that the present invention is not limited by the special metering IC performance and function, itself can be based on
The excellent algorithm of exploitation measures to accurate quantification the dynamic characteristic of Harmonic in Power System voltage, electric current, realizes the humorous of more high order
The electrical energy measurement of wave analysis and more high accuracy.
Detailed description of the invention
Fig. 1 is structural principle block diagram of the invention；
Fig. 2 is of the invention based on ADC and three spectral line interpolation FFT of Rife-Vincent window processing basic flow chart.
Specific embodiment
The principle of the present invention block diagram is as shown in Figure 1, include high-precision 8 Channel Synchronous ADC converters, dsp processor, MCU
And each peripheral circuit.ADC selects 24 8 Channel Synchronous sampling A/D chip ADS1278 of high speed, and dsp processor is selected
TMS320VC5502, MCU select MSP430F449, and harmonic detecting highest number is 50 times.
Three-phase power grid voltage, current analog signal pass through resistance pressure-dividing network respectively and CT resistance sampling network carries out signal
Conditioning obtains the≤AC signal of 2.5V, effectively to inhibit influence of the high-frequency electromagnetic interference signal to data sampling, voltage, electricity
The identical RC low-pass filter of rear class access parameter in stream conditioning channel, to keep sampling the phase between front and back voltage, electric current
Potential difference is consistent.Switching diode 1SS123 clipping is accessed in the rear end CT, prevents the excessive damage device of Current Transmit primary side current
Part.The reference power supply ADR121 of high-precision and high thermal stability is selected to provide the external reference voltage V of+2.5V for ADS1278REF,
Guarantee that sample circuit has higher precision and thermal stability.
Sampled data A/D conversion (analog-to-digital conversion) is sent by SPI interface to TMS320VC5502 data processing unit, warp afterwards
After crossing digital low-pass filtering, DC offset correction, being corrected than difference and angular difference, completed by TMS320VC5502 data processing unit
Discrete Rife-Vincent window is constructed, the processing of three spectral line interpolation FFT of adding window is carried out, obtains each harmonic parameter.
The expression formula of discrete Rife-Vincent window is as follows in the present embodiment
In formula, L indicates that the item number of window function, al meet constraint condition
The discrete spectrum function of Rife-Vincent window can be obtained by formula (1) are as follows:
In formula, WR() is the frequency spectrum function of rectangular window, and expression formula is
Five Rife-Vincent (I) self-convolution windows are carried out to discrete signal and are weighted truncation, obtain xω(n)=x (n)
× W (ω), wherein n=0,1,2, N-1.To xω(n) DTFT is to convert:
The influence for ignoring negative frequency point and other each harmonics is analyzed by taking h subharmonic as an example, to Xω(ω) is at equal intervalsSampling (DFT) can obtain:
In formulaK=0,1,2, N-1.
Due to the application of non-synchronous sampling, there are fence effect, i.e., practical h subfrequency (f in actual samplesh=kh
Δ f) is not located at Xω(k) (i.e. k on discrete spectrum pointhIt is not integer).If nearby amplitude maximum spectral line is peak value frequency point
ka, left and right spectral line is respectively ka-1, ka+1.The amplitude of this 3 spectral lines is respectively y1=| Xω(ka-1) |, y2=| Xω(ka) |, y3=
|Xω(ka+1)|。
Remember δ=kh-ka, the value range for obtaining δ is (- 0.5,0.5), enables β=(y3-y1)/y2, then it can be obtained by formula (5):
Note formula (6) is β=f (δ).
It can thus be concluded that the frequency correction formula of signal are as follows:
fh=(ka+δ)fs/N (7)
Phase only pupil filter formula are as follows:
The amplitude of h subharmonic is weighted to obtain by three spectral lines, it is contemplated that y2For amplitude maximum spectral line, y is given2With compared with
Big weight can be obtained by formula (5):
It can then be obtained by (9)
One group of δ is taken in [- 0.5,0.5], finds out corresponding β value respectively, calls ployfit (β, δ, m) function to carry out multinomial
Formula fitting, finds out inverse function δ=f-1(β).W (- δ), W (- δ ± 1) are substituted into formula (10) and call ployfit (β, g (δ), m)
Amplitude correction formula can be obtained in function are as follows:
Ah=N (y3+2y2+y1)g(δ) (11)
By handling spectrum analysis based on three spectral line interpolation FFT of Rife-Vincent window, fundametal compoment and 2~50 are isolated
Order harmonic components are completed electric parameter metering, frequency analysis, harmonic electric energy metering etc. by TMS320VC5502 real time high-speed and are appointed
Business.Processing result is sent to MCU administrative unit by asynchronous serial bus UART interface, each outer boxing with MSP430F449
Block realizes harmonic electric energy numerical value and histogram is shown and the work such as data statistics, storage, communication.
Claims (4)
1. a kind of harmonic electric energy meter based on ADC Yu three spectral line interpolation FFT of Rife-Vincent window, including signal condition part,
Data processing section and data administrative section, which is characterized in that
The signal condition part, including ADC converter, resistance pressure-dividing network and CT resistance sampling network；It will be specified in system
Value is the current voltage analog signal of 220V and 1.5A, by resistance pressure-dividing network and CT resistance sampling network, become≤2.5V
AC signal is sent into 8 Channel Synchronous sampling ADCs of high-precision；
The data processing section, including dsp processor；Sampled data is sent into DSP data processing by special purpose interface SPI interface
Part, it is narrow by main lobe, secondary lobe is low and fall fireballing Rife-Vincent window to signal carry out adding window, discrete fourier become
It changes, fundamental wave and each harmonic content in the detection measured signal of three spectral line interpolation FFT calculation process, Polynomial Fitting Technique, calculates
Frequency, amplitude, phase, power, percent harmonic distortion parameter, and will treated that data are sent to MCU is stored, communicated and shown
Show processing；
The data management part, including MCU chip, real-time clock, SDRAM and FLASH memory, communication interface circuit, figure
Shape lattice lcd is hard core control fundamental wave and each harmonic content by MCU, is analyzed using graphical Dot-Matric LCD Display harmonic wave column
Figure；
The ADC converter is connected with dsp processor using dedicated SPI interface；Dsp processor and MCU chip use asynchronous string
Row bus UART port is connected；Connected outside MCU chip simultaneously real-time clock, SDRAM and FLASH memory, communication interface circuit,
Graphic dot matrix liquid crystal is controlled by MCU chip and completes work.
2. a kind of harmonic electric energy based on ADC Yu three spectral line interpolation FFT of Rife-Vincent window according to claim 1
Table, which is characterized in that the chip model of the ADC converter is ADS1278.
3. a kind of harmonic electric energy based on ADC Yu three spectral line interpolation FFT of Rife-Vincent window according to claim 1
Table, which is characterized in that the chip model of the dsp processor is TMS320VC5502.
4. a kind of harmonic electric energy based on ADC Yu three spectral line interpolation FFT of Rife-Vincent window according to claim 1
Table, which is characterized in that the MCU chip model MSP430F449, harmonic detecting highest number are 50 times.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110007148A (en) * | 2019-03-28 | 2019-07-12 | 东南大学 | A kind of simple signal frequency estimating methods based on the comprehensive interpolation of discrete spectrum phase and amplitude |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101261292A (en) * | 2008-04-14 | 2008-09-10 | 湖南大学 | Base wave and harmonic detection method based on fiver item Rife-Vincent(1)window double spectral line interpolation FFT |
| CN201352236Y (en) * | 2008-12-02 | 2009-11-25 | 湖南海兴电器有限责任公司 | Harmonic power meter based on Kaiser window double-spectrum-line interpolation FFT |
| CN103197141A (en) * | 2013-03-21 | 2013-07-10 | 广东电网公司电力科学研究院 | Method of measuring electrical power system signal frequency and harmonic wave parameters |
| CN103675447A (en) * | 2013-12-17 | 2014-03-26 | 国家电网公司 | High-precision real-time harmonic wave analysis method of electrified railway |
| CN104897960A (en) * | 2015-06-15 | 2015-09-09 | 中南民族大学 | Harmonic rapid analysis method and system based on windowing four-spectral-line interpolation FFT |
| CN104897961A (en) * | 2015-06-17 | 2015-09-09 | 中南民族大学 | Three spectral line interpolation FFT harmonic wave analysis method and system based on multiplication window function |
-
2018
- 2018-12-06 CN CN201811244064.0A patent/CN109283386A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101261292A (en) * | 2008-04-14 | 2008-09-10 | 湖南大学 | Base wave and harmonic detection method based on fiver item Rife-Vincent(1)window double spectral line interpolation FFT |
| CN201352236Y (en) * | 2008-12-02 | 2009-11-25 | 湖南海兴电器有限责任公司 | Harmonic power meter based on Kaiser window double-spectrum-line interpolation FFT |
| CN103197141A (en) * | 2013-03-21 | 2013-07-10 | 广东电网公司电力科学研究院 | Method of measuring electrical power system signal frequency and harmonic wave parameters |
| CN103675447A (en) * | 2013-12-17 | 2014-03-26 | 国家电网公司 | High-precision real-time harmonic wave analysis method of electrified railway |
| CN104897960A (en) * | 2015-06-15 | 2015-09-09 | 中南民族大学 | Harmonic rapid analysis method and system based on windowing four-spectral-line interpolation FFT |
| CN104897961A (en) * | 2015-06-17 | 2015-09-09 | 中南民族大学 | Three spectral line interpolation FFT harmonic wave analysis method and system based on multiplication window function |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110007148A (en) * | 2019-03-28 | 2019-07-12 | 东南大学 | A kind of simple signal frequency estimating methods based on the comprehensive interpolation of discrete spectrum phase and amplitude |
| CN110007148B (en) * | 2019-03-28 | 2021-03-16 | 东南大学 | Single-frequency signal frequency estimation method based on comprehensive interpolation of discrete spectrum phase and amplitude |
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