CN105652082A - High-precision electric signal frequency measurement method and device - Google Patents
High-precision electric signal frequency measurement method and device Download PDFInfo
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- CN105652082A CN105652082A CN201511027256.2A CN201511027256A CN105652082A CN 105652082 A CN105652082 A CN 105652082A CN 201511027256 A CN201511027256 A CN 201511027256A CN 105652082 A CN105652082 A CN 105652082A
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- 238000000691 measurement method Methods 0.000 title claims abstract description 15
- 238000005070 sampling Methods 0.000 claims abstract description 46
- 238000000034 method Methods 0.000 claims description 17
- 238000012545 processing Methods 0.000 claims description 4
- 238000005259 measurement Methods 0.000 abstract description 6
- 238000010586 diagram Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 238000004364 calculation method Methods 0.000 description 3
- 238000010998 test method Methods 0.000 description 3
- 238000007598 dipping method Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
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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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- Measuring Frequencies, Analyzing Spectra (AREA)
Abstract
The invention discloses a high-precision electric signal frequency measurement method. The high-precision electric signal frequency measurement method comprises the following steps: S1, acquiring an electric signal to be measured; S2, obtaining a sampling point number of an integer part of the electric signal in a zero crossing point manner; S3, carrying out linear interpolation on a zero crossing point part to obtain a complete electric signal after interpolation, and obtaining a decimal point part of the sampling point number after the interpolation by adopting a linear interpolation formula; and S4, overlapping the sampling point number of the decimal point part and a sampling point of the integer part so as to obtain a total sampling point number, and dividing a sampling frequency by the total sampling point number to obtain a needed frequency value of the electric signal. The invention further provides a high-precision electric signal frequency measurement device.
Description
[technical field]
The present invention relates to electric-power metering field, in particular to a kind of high precision electrical signal frequency measurement method and device thereof.
[background technology]
Electric-power metering and calibrating installation are the metering outfits of current intelligent grid, error in dipping is the important parameter of measuring apparatus assessment of performance, and the key parameter that frequency is measured as it, therefore improve the precision of frequency measurement, the control of error is played a part most important. Along with the progress of science and technology, the accuracy requirement of equipment is more and more higher, frequency measurement is as one of measurement the most basic in electronic measurement technology, it is to increase frequency measurement accuracy is the prerequisite of amplitude, the raising of phase calculation equally accurate.
In current frequency measurement method, mainly counting process, cycle test method, least absolute value are similar to the method such as algorithm and newton's algorithm. Simply, easily realize, but the error of the data recorded is relatively big for the method for counting process and cycle test method, and the occasion high for accuracy requirement is not suitable for, and least absolute value algorithm that is approximate and newton's algorithm is complicated, not easily understand, calculated amount is big.
[summary of the invention]
The present invention provides a kind of high precision electrical signal frequency measurement method and device, it is possible to effectively solve the problem.
A kind of high precision electrical signal frequency measurement method, comprises the following steps:
S1, obtains electrical signal to be measured;
S2, draws the sampling number of its integral part to electrical signal with zero passage point mode;
S3, cross zero point place carry out linear interpolation draw described interpolation after complete telecommunications number, adopt linear interpolation formula draw the radix point part that described interpolation post-sampling is counted;
S4, mantissa sampling number superposes with integral part sampling point, thus draws total sampling number, and sample frequency draws the frequency values of required electrical signal divided by total sampling number.
Further, draw, by crossing the method for zero point, the integral part that described interpolation post-sampling is counted.
Further, adopt frequency compensation to show that the step of the radix point part that described interpolation post-sampling is counted comprises:
S31, chooses a cycle f1In two of same direction cross zero points, and define a front front and back one moment sampling point crossing zero point place and be respectively f0(n) and f1(0), cycle f1The sampling point in a rear front and back moment crossing zero point place is respectively f2And f (0)1(n), f1And f (0)0N the distance between () is temp1, f1(0) and between time axle is temp2, f2And f (0)1N the distance between () is temp3, f2(0) and between time axle is temp4;And
S32, the decimal modified value obtaining starting point correct is temp2/temp1, and the mantissa of the unnecessary part in terminating point place is temp4/temp3, and obtains described radix point part according to formula temp2/temp1-temp4/temp3.
A kind of high precision electrical signal frequency measuring equipment, comprising:
Signal gathering unit, for the multiple pulse signals obtained in unit time interval T;
Data processing unit, for the mistake zero point place of each pulse signal is carried out linear interpolation arithmetic, obtains complete telecommunications number after multiple interpolation;
Calculate unit, for drawing the integral part of sampling number in described interpolation afterpulse signal by crossing the method for zero point;
Compensating unit, for adopting frequency compensation to draw the radix point part of sampling number in described interpolation afterpulse signal, and the described integral part that is added to, thus draw frequency values.
High precision electrical signal frequency measurement method provided by the invention and device, by to linearly interpolation processing, to set up complete signal, recycling counting process or cycle test method calculate sampling number roughly and frequency, finally frequency is compensated calculating to improve its precision, obtain high precision frequency values such that it is able to final. In addition, this scheme is in maintenance implementation method simply basis, whole scheme uses simple Measuring Frequency Method is compensated the frequency values obtaining high precision, exploitation and the difficulty safeguarded are little, the complicated calculations that need not be carried out by big data quantity, well solves the calculation of complex of complicated algorithm, measures the problems such as precision that is big and simple algorithm is not high.
[accompanying drawing explanation]
The functional block diagram of the high precision electrical signal frequency measurement method that Fig. 1 provides for the embodiment of the present invention.
Fig. 2 is the schematic diagram of linear interpolation method.
The high precision electrical signal frequency measurement method that Fig. 3 provides for the embodiment of the present invention adopt frequency compensation to draw the schematic diagram of the radix point part of sampling number in described interpolation afterpulse signal.
[embodiment]
Below in conjunction with drawings and Examples, the present invention is described in further detail. It should be appreciated that specific embodiment described herein is only for explaining the present invention, but not limitation of the invention. It also should be noted that, for convenience of description, accompanying drawing illustrate only part related to the present invention and not all structure.
Please refer to Fig. 1, the embodiment of the present invention provides a kind of high precision electrical signal frequency measurement method, comprising:
S1, obtains electrical signal to be measured;
S2, draws the sampling number of its integral part to electrical signal with zero passage point mode;
S3, cross zero point place carry out linear interpolation draw described interpolation after complete telecommunications number, adopt linear interpolation formula draw the radix point part that described interpolation post-sampling is counted;
S4, mantissa sampling number superposes with integral part sampling point, thus draws total sampling number, and sample frequency draws the frequency values of required electrical signal divided by total sampling number.
In step s3, for the pulse signal fed, integral part tolerance range above is passable, so mainly carrying out interpolation in mantissa, to obtain higher precision. Often taking Interpolate estimation method to draw complete signal or be convenient to the signal of calculating needed for us, linear interpolation method is simple, meaning is clear and definite, be convenient to grasp and use. Please refer to Fig. 2, Fig. 2 is the schematic diagram of linear interpolation method. It is assumed that coordinate (x0, y0) and (x1, y1), interval [x will be obtained0, x1] in the y value of a certain position x on straight line, it is possible to obtain formula (y-y0)(x1-x0)=(y1-y0)(x-x0), it is assumed that equation two boundary values is ��, and so this value is exactly that difference coefficient is from x0To the distance of x and from x1To x0Ratio.Owing to x value is known, so obtain the value ��=(x-x of �� from formula0)/(x1-x0), equally, ��=(y-y0)/(y1-y0), like this, algebraically just can be expressed as: y=(1-��) y0+��y1Or y=y0+��(y1-y0)
Please refer to Fig. 3, adopt frequency compensation to show that the step of the radix point part of sampling number in described interpolation afterpulse signal comprises:
S31, chooses a cycle f1In two of same direction cross zero points, and to define front ripple week be f0, rear ripple week is f2, ripple week f0The point crossing zero point place is f0(n), ripple week f1The point crossing zero point place is respectively f1And f (0)1(n), ripple week f2The point crossing zero point place is f2(0), f1And f (0)0N the distance between () is temp1, f1(0) and between time axle is temp2, f2And f (0)1N the distance between () is temp3, f2(0) and between time axle is temp4; And
S32, the decimal modified value obtaining starting point correct is temp2/temp1, and the mantissa of the unnecessary part in terminating point place is temp4/temp3, and obtains described radix point part according to formula temp2/temp1-temp4/temp3.
The embodiment of the present invention also provides a kind of high precision electrical signal frequency measuring equipment, comprising:
Signal gathering unit, for the multiple pulse signals obtained in unit time interval T;
Data processing unit, for the mistake zero point place of each pulse signal is carried out linear interpolation arithmetic, obtains complete telecommunications number after multiple interpolation;
Calculate unit, for drawing the integral part of sampling number in described interpolation afterpulse signal by crossing the method for zero point; And
Compensating unit, for adopting frequency compensation to draw the radix point part of sampling number in described interpolation afterpulse signal, and the described integral part that is added to, thus draw frequency values.
Note, above are only the better embodiment of the present invention and institute's application technology principle. It is understood by those skilled in the art that and the invention is not restricted to specific embodiment described here, various obvious change can be carried out for a person skilled in the art, readjust and substitute and protection scope of the present invention can not be departed from. Therefore, although being described in further detail invention has been by above embodiment, but the present invention is not limited only to above embodiment, when not departing from present inventive concept, other equivalence embodiments more can also be comprised, and the scope of the present invention is determined by appended right.
Claims (6)
1. a high precision electrical signal frequency measurement method, it is characterised in that, comprise the following steps:
S1, obtains electrical signal to be measured;
S2, draws the sampling number of its integral part to electrical signal with zero passage point mode;
S3, cross zero point place carry out linear interpolation draw described interpolation after complete telecommunications number, adopt linear interpolation formula draw the radix point part that described interpolation post-sampling is counted;
S4, mantissa sampling number superposes with integral part sampling point, thus draws total sampling number, and sample frequency draws the frequency values of required electrical signal divided by total sampling number.
2. high precision electrical signal frequency measurement method according to claim 1, it is characterised in that, draw, by crossing the method for zero point, the integral part that described interpolation post-sampling is counted.
3. high precision electrical signal frequency measurement method according to claim 1, it is characterised in that, adopt frequency compensation to draw and comprise the radix point part that described interpolation post-sampling is counted:
S31, chooses a cycle f1In two of same direction cross zero points, and define a front front and back one moment sampling point crossing zero point place and be respectively f0(n) and f1(0), cycle f1The sampling point in a rear front and back moment crossing zero point place is respectively f2And f (0)1(n), f1And f (0)0N the distance between () is temp1, f1(0) and between time axle is temp2, f2And f (0)1N the distance between () is temp3, f2(0) and between time axle is temp4;And
S32, the decimal modified value obtaining starting point correct is temp2/temp1, and the mantissa of the unnecessary part in terminating point place is temp4/temp3, and obtains described radix point part according to formula temp2/temp1-temp4/temp3.
4. a high precision electrical signal frequency measuring equipment, it is characterised in that, comprising:
Signal gathering unit, for obtaining electrical signal;
Data processing unit, for the mistake zero point place of electrical signal is carried out linear interpolation arithmetic, obtains complete telecommunications number after multiple interpolation;
Calculate unit, for drawing the integral part of sampling number in described interpolation afterpulse signal by crossing the method for zero point;
Compensating unit, for adopting frequency compensation to draw the radix point part of sampling number in described interpolation afterpulse signal, and the described integral part that is added to, thus draw frequency values.
5. high precision electrical signal frequency measuring equipment according to claim 5, it is characterised in that, the described method by crossing zero point draws the integral part of sampling number in after described interpolation.
6. high precision electrical signal frequency measuring equipment according to claim 5, it is characterised in that, adopt frequency compensation to draw the radix point part of sampling number in described interpolation afterpulse signal, comprising:
Choose a cycle f1In two of same direction cross zero points, and define a front front and back one moment sampling point crossing zero point place and be respectively f0(n) and f1(0), cycle f1The sampling point in a rear front and back moment crossing zero point place is respectively f2And f (0)1(n), f1And f (0)0N the distance between () is temp1, f1(0) and between time axle is temp2, f2And f (0)1N the distance between () is temp3, f2(0) and between time axle is temp4;
The decimal modified value obtaining starting point correct is temp2/temp1, and the mantissa of the unnecessary part in terminating point place is temp4/temp3, and obtains described radix point part according to formula temp2/temp1-temp4/temp3.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110719043A (en) * | 2019-11-21 | 2020-01-21 | 深圳国能电气有限公司 | Inverter harmonic compensation method and control device thereof |
| CN116908537A (en) * | 2023-09-13 | 2023-10-20 | 西安西电高压开关有限责任公司 | Current voltage frequency calculation circuit and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
| CN101871965B (en) * | 2010-06-11 | 2012-01-04 | 威胜集团有限公司 | Method for detecting zero crossing time, frequency and phase difference of power sinusoidal signals |
| CN102608415B (en) * | 2012-02-10 | 2015-06-17 | 南京弘毅电气自动化有限公司 | Software frequency tracking algorithm on basis of weighted double fitting |
| CN102809687B (en) * | 2012-07-26 | 2015-01-28 | 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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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110719043A (en) * | 2019-11-21 | 2020-01-21 | 深圳国能电气有限公司 | Inverter harmonic compensation method and control device thereof |
| CN110719043B (en) * | 2019-11-21 | 2021-02-05 | 深圳国能电气有限公司 | Inverter harmonic compensation method and control device thereof |
| CN116908537A (en) * | 2023-09-13 | 2023-10-20 | 西安西电高压开关有限责任公司 | Current voltage frequency calculation circuit and method |
| CN116908537B (en) * | 2023-09-13 | 2023-12-19 | 西安西电高压开关有限责任公司 | Current voltage frequency calculation circuit and method |
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