CN105652082B - High precision electro signal frequency measurement method and its device - Google Patents
High precision electro signal frequency measurement method and its device Download PDFInfo
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- CN105652082B CN105652082B CN201511027256.2A CN201511027256A CN105652082B CN 105652082 B CN105652082 B CN 105652082B CN 201511027256 A CN201511027256 A CN 201511027256A CN 105652082 B CN105652082 B CN 105652082B
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- 238000000691 measurement method Methods 0.000 title claims abstract description 13
- 238000005070 sampling Methods 0.000 claims abstract description 37
- 238000000034 method Methods 0.000 claims description 19
- 238000012937 correction Methods 0.000 claims description 4
- 238000012545 processing Methods 0.000 claims description 4
- 230000005611 electricity Effects 0.000 claims 1
- 238000005259 measurement Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 238000010998 test method Methods 0.000 description 3
- 238000004364 calculation method Methods 0.000 description 2
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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
- G01R23/02—Arrangements for measuring frequency, e.g. pulse repetition rate; Arrangements for measuring period of current or voltage
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Abstract
The present invention discloses a kind of high precision electro signal frequency measurement method, comprising: S1 obtains electric signal to be measured；S2 obtains the sampling number of its integer part to electric signal with zero passage point mode；S3 carries out the complete telecommunications number after linear interpolation obtains the interpolation at zero crossing, and the decimal point part of the interpolation post-sampling points is obtained using linear interpolation formula；S4, fractional part sampling number are overlapped with integer part sampled point, to obtain total sampling number, sample frequency is shown to the frequency values of required electric signal divided by total sampling number.The present invention also provides a kind of high precision electro signal frequency measuring devices.
Description
[technical field]
The present invention relates to electric-power metering field, in particular to a kind of high precision electro signal frequency measurement method and its device.
[background technique]
Electric-power metering and calibrating installation are the measuring equipments of current smart grid, and measurement error is metering device assessment of performance
Important parameter, and key parameter of the frequency as its measurement, therefore improve the precision of frequency measurement play the control of error
Vital effect.With the development of science and technology the required precision to equipment is higher and higher, frequency measurement is as electronic surveying
Most basic one of measurement in technology improves the premise that frequency measurement accuracy is amplitude, the raising of phase calculation equally accurate.
At present in frequency measurement method, mainly counting method, cycle test method, least absolute value approximate algorithm and Newton's algorithm etc.
Method.Counting method and the method for cycle test method be simple, Yi Shixian, but the error of the data measured is larger, high for required precision
Occasion is simultaneously not suitable for, and the algorithm of least absolute value approximation and Newton's algorithm is not complicated, readily understood, computationally intensive.
[summary of the invention]
The present invention provides a kind of high precision electro signal frequency measurement method and device, can effectively solve the above problems.
A kind of high precision electro signal frequency measurement method, comprising the following steps:
S1 obtains electric signal to be measured；
S2 obtains the sampling number of its integer part to electric signal with zero passage point mode；
S3 carries out the complete telecommunications number after linear interpolation obtains the interpolation, using linear interpolation formula at zero crossing
Obtain the decimal point part of the interpolation post-sampling points；
S4, fractional part sampling number are overlapped with integer part sampled point, to obtain total sampling number, will be sampled
Frequency obtains the frequency values of required electric signal divided by total sampling number.
Further, the integer part of the interpolation post-sampling points is obtained by the method for zero crossing.
Further, the step of obtaining the decimal point part of interpolation post-sampling points using frequency compensation include:
S31 chooses a cycle f1In the same direction two zero crossings, and define the front and back at previous zero crossing
One moment sampled point is respectively f0(n) and f1(0), cycle f1The sampled point at the front and back moment at the latter zero crossing is respectively f2
(0) and f1(n), f1(0) and f0It the distance between (n) is temp1, f1It (0) is temp2, f between time shaft2(0) and f1
It the distance between (n) is temp3, f2It (0) is temp4 between time shaft；And
S32, obtaining the correct decimal correction value in starting point is redundance at temp2/temp1 and terminating point
Fractional part is temp4/temp3, and obtains the decimal point part according to formula temp2/temp1-temp4/temp3.
A kind of high precision electro signal frequency measuring device, comprising:
Signal acquisition unit, for obtaining multiple pulse signals in the T of unit interval；
Data processing unit obtains multiple insert for carrying out linear interpolation arithmetic at the zero crossing to each pulse signal
Complete telecommunications number after value；
Computing unit obtains the integer portion of sampling number in the interpolation afterpulse signal for the method by zero crossing
Point；
Compensating unit, for obtaining the decimal point portion of sampling number in the interpolation afterpulse signal using frequency compensation
Point, and the integer part that is added to, to obtain frequency values.
High precision electro signal frequency measurement method provided by the invention and device, by linearly interpolation processing, with
Complete signal is established, recycles counting method or cycle test method to calculate rough hits and frequency, meter finally is compensated to frequency
It calculates to improve its precision, so as to finally obtain high-precision frequency values.In addition, this programme is keeping the simple base of implementation method
On plinth, using being compensated to simple Measuring Frequency Method to obtain high-precision frequency values, the difficulty of exploitation and maintenance in entire scheme
It spends small, it is not necessary to which, to the complicated calculations that big data quantity carries out, the calculating of very good solution complicated algorithm is complicated, amount is big and simple calculates
The problems such as precision of method is not high.
[Detailed description of the invention]
Fig. 1 is the functional block diagram of high precision electro signal frequency measurement method provided in an embodiment of the present invention.
Fig. 2 is the schematic diagram of linear interpolation method.
Fig. 3 is described to be obtained in high precision electro signal frequency measurement method provided in an embodiment of the present invention using frequency compensation
The schematic diagram of the decimal point part of sampling number in interpolation afterpulse signal.
[specific embodiment]
The present invention is described in further detail with reference to the accompanying drawings and examples.It is understood that this place is retouched
The specific embodiment stated is used only for explaining the present invention rather than limiting the invention.It also should be noted that in order to just
Only the parts related to the present invention are shown in description, attached drawing rather than entire infrastructure.
Fig. 1 is please referred to, the embodiment of the present invention provides a kind of high precision electro signal frequency measurement method, comprising:
S1 obtains electric signal to be measured；
S2 obtains the sampling number of its integer part to electric signal with zero passage point mode；
S3 carries out the complete telecommunications number after linear interpolation obtains the interpolation, using linear interpolation formula at zero crossing
Obtain the decimal point part of the interpolation post-sampling points；
S4, fractional part sampling number are overlapped with integer part sampled point, to obtain total sampling number, will be sampled
Frequency obtains the frequency values of required electric signal divided by total sampling number.
In step s3, for the pulse signal fed, the integer part accuracy of front can be with so mainly exist
Fractional part carries out interpolation, to obtain higher precision.Often take Interpolate estimation method obtain complete signal or we needed for just
In the signal of calculating, linear interpolation method is simple, meaning is clear, convenient for grasp and use.Referring to figure 2., Fig. 2 is linear interpolation
The schematic diagram of method.Assuming that known coordinate (x0, y0) and (x1, y1), to obtain section [x0, x1] in a certain position x on straight line
Y value, available formula (y-y0)(x1-x0)=(y1-y0)(x-x0), it is assumed that two boundary values of equation is α, then this value is exactly
Difference coefficient is from x0To x distance with from x1To x0Ratio.Due to x value it is known that so obtaining value α=(x- of α from formula
x0)/(x1-x0), equally, α=(y-y0)/(y1-y0), in this way, can be expressed as on algebra: y=(1- α) y0+αy1Or y=
y0+α(y1-y0)
Referring to figure 3., the decimal point part of sampling number in the interpolation afterpulse signal is obtained using frequency compensation
Step includes:
S31 chooses a cycle f1In the same direction two zero crossings, and define previous wave week be f0, the latter
Wave week is f2, wave week f0Point at zero crossing is f0(n), wave week f1Point at zero crossing is respectively f1(0) and f1(n), wave week f2
Point at zero crossing is f2(0), f1(0) and f0It the distance between (n) is temp1, f1It (0) is temp2, f between time shaft2
(0) and f1It the distance between (n) is temp3, f2It (0) is temp4 between time shaft；And
S32, obtaining the correct decimal correction value in starting point is redundance at temp2/temp1 and terminating point
Fractional part is temp4/temp3, and obtains the decimal point part according to formula temp2/temp1-temp4/temp3.
The embodiment of the present invention also provides a kind of high precision electro signal frequency measuring device, comprising:
Signal acquisition unit, for obtaining multiple pulse signals in the T of unit interval；
Data processing unit obtains multiple insert for carrying out linear interpolation arithmetic at the zero crossing to each pulse signal
Complete telecommunications number after value；
Computing unit obtains the integer portion of sampling number in the interpolation afterpulse signal for the method by zero crossing
Point；And
Compensating unit, for obtaining the decimal point portion of sampling number in the interpolation afterpulse signal using frequency compensation
Point, and the integer part that is added to, to obtain frequency values.
Note that the above is only a better embodiment of the present invention and the applied technical principle.It will be appreciated by those skilled in the art that
The invention is not limited to the specific embodiments described herein, be able to carry out for a person skilled in the art it is various it is apparent variation,
It readjusts and substitutes without departing from protection scope of the present invention.Therefore, although being carried out by above embodiments to the present invention
It is described in further detail, but the present invention is not limited to the above embodiments only, without departing from the inventive concept, also
It may include more other equivalent embodiments, and the scope of the invention is determined by the scope of the appended claims.
Claims (4)
1. a kind of high precision electro signal frequency measurement method, which comprises the following steps:
S1 obtains electric signal to be measured；
S2 obtains the sampling number of its integer part to electric signal with zero passage point mode；
S3 is carried out the complete telecommunications number after linear interpolation obtains the interpolation at zero crossing, is obtained using linear interpolation formula
The decimal point part of the interpolation post-sampling points；
The decimal point part of the interpolation post-sampling points is obtained using frequency compensation, comprising:
S31 chooses a cycle f1In the same direction two zero crossings, and define the front and back at previous zero crossing for the moment
Carving sampled point is respectively f0(n) and f1(0), cycle f1The sampled point at the front and back moment at the latter zero crossing is respectively f1(n) and
f2(0), f1(0) and f0It the distance between (n) is temp1, f1It (0) is temp2, f between time shaft2(0) and f1(n) between
Distance be temp3, f2It (0) is temp4 between time shaft；And
S32 obtains the decimal that the correct decimal correction value in starting point is redundance at temp2/temp1 and terminating point
Part is temp4/temp3, and obtains the decimal point part according to formula temp2/temp1-temp4/temp3；
S4, fractional part sampling number are overlapped with integer part sampled point, so that total sampling number is obtained, by sample frequency
The frequency values of required electric signal are obtained divided by total sampling number.
2. high precision electro signal frequency measurement method according to claim 1, which is characterized in that pass through the method for zero crossing
Obtain the integer part of the interpolation post-sampling points.
3. a kind of high precision electro signal frequency measuring device characterized by comprising
Signal acquisition unit, for obtaining electric signal；
Data processing unit obtains complete electricity after multiple interpolation for carrying out linear interpolation arithmetic at the zero crossing to electric signal
Signal；
Computing unit obtains the integer part of sampling number in the interpolation afterpulse signal for the method by zero crossing；
Compensating unit, for obtaining the decimal point part of sampling number in the interpolation afterpulse signal using frequency compensation, and
Be added to the integer part, to obtain total sampling number, sample frequency is obtained electric signal divided by total sampling number
Frequency values；
The decimal point part of sampling number in the interpolation afterpulse signal is obtained using frequency compensation, comprising:
Choose a cycle f1In the same direction two zero crossings, and define the preceding later moment in time at previous zero crossing and adopt
Sampling point is respectively f0(n) and f1(0), cycle f1The sampled point at the front and back moment at the latter zero crossing is respectively f1(n) and f2
(0), f1(0) and f0It the distance between (n) is temp1, f1It (0) is temp2, f between time shaft2(0) and f1(n) between
Distance is temp3, f2It (0) is temp4 between time shaft；
Obtain the fractional part that the correct decimal correction value in starting point is redundance at temp2/temp1 and terminating point
For temp4/temp3, and the decimal point part is obtained according to formula temp2/temp1-temp4/temp3.
4. high precision electro signal frequency measuring device according to claim 3, which is characterized in that described by zero crossing
Method obtains the integer part of middle sampling number after the interpolation.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10203683C1 (en) * | 2002-01-24 | 2003-08-21 | Siemens Ag | Electrical signal measuring parameter extraction method with sampling rate for providing sampled signal values matched to momentary signal frequency |
| CN101871965A (en) * | 2010-06-11 | 2010-10-27 | 威胜集团有限公司 | Method for detecting zero crossing time, frequency and phase difference of power sinusoidal signals |
| CN102608415A (en) * | 2012-02-10 | 2012-07-25 | 南京弘毅电气自动化有限公司 | Software frequency tracking algorithm on basis of weighted double fitting |
| CN102809687A (en) * | 2012-07-26 | 2012-12-05 | 南京邮电大学 | Digital measurement method for alternating-current frequency |
| CN102879639A (en) * | 2012-09-13 | 2013-01-16 | 华中科技大学 | Real-time frequency measuring method in power system |
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- 2015-12-30 CN CN201511027256.2A patent/CN105652082B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10203683C1 (en) * | 2002-01-24 | 2003-08-21 | Siemens Ag | Electrical signal measuring parameter extraction method with sampling rate for providing sampled signal values matched to momentary signal frequency |
| CN101871965A (en) * | 2010-06-11 | 2010-10-27 | 威胜集团有限公司 | Method for detecting zero crossing time, frequency and phase difference of power sinusoidal signals |
| CN102608415A (en) * | 2012-02-10 | 2012-07-25 | 南京弘毅电气自动化有限公司 | Software frequency tracking algorithm on basis of weighted double fitting |
| CN102809687A (en) * | 2012-07-26 | 2012-12-05 | 南京邮电大学 | Digital measurement method for alternating-current frequency |
| CN102879639A (en) * | 2012-09-13 | 2013-01-16 | 华中科技大学 | Real-time frequency measuring method in power system |
Non-Patent Citations (1)
| Title |
|---|
| 一种实用的高精度频率测量方法;杨永标 等;《继电器》;20071201;第35卷;第272-275页 |
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