CN104375003B - The method that sampled point is lifted in zero pressure drop equipment - Google Patents
The method that sampled point is lifted in zero pressure drop equipment Download PDFInfo
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- CN104375003B CN104375003B CN201410628205.4A CN201410628205A CN104375003B CN 104375003 B CN104375003 B CN 104375003B CN 201410628205 A CN201410628205 A CN 201410628205A CN 104375003 B CN104375003 B CN 104375003B
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Abstract
The present invention relates to electric-power metering technical field, more particularly to a kind of method that sampled point is lifted in zero pressure drop equipment, it is according to current sampling point and the variable quantity relative to previous sampled point, to judge where be currently at sine wave, and the maximum variable quantity of this position, amplitude limit is done with the maximum variable quantity for finding to reduce the distortion level of waveform during containing harmonic wave, mainly include the following steps that：Dynamic data is set up in data receiver receive form first；The data to be received such as then, after receiving data, judgement is phase, and signal is respectively fed into data receiver form；It is last that 220 sampled points are chosen within a sampling period, 219 maximum variable quantities of segmentation are calculated according to theoretical value, the method that the method for sampled point employs " limitation variable quantity " is lifted in zero pressure drop equipment provided by the present invention, harmonic wave can effectively be suppressed, reduce the distortion level of the waveform caused by containing harmonic wave.
Description
Technical field
Can effectively suppress harmonic wave the present invention relates to electric-power metering technical field, more particularly to one kind, can solve because of harmonic wave
The method that sampled point is lifted in the zero pressure drop equipment of the waveform serious distortion problem brought.
Background technology
According to《Electric power meter technical management code》The regulation of DL/T448-2000：" Secondary Circuit of Potential Transformer
Voltage drop, to I class charging metering device, should be not more than the 0.25% of rated secondary voltage；Other metering devices, should be not more than
The 0.5% of rated secondary voltage ".
The error of electric power meter, is by resultant error, the electric energy of voltage transformer (PT) summation current transformer (CT)
The error in dipping that the error of table, PT secondary circuit voltage drops cause is constituted.Wherein, PT secondary circuit voltage drops (abbreviation secondary voltage drop)
The error in dipping for causing is often maximum, so eliminating or reducing secondary voltage drop, the precision for ensureing metering device is not allow gently
Depending on problem.In power system, can there are some errors in electric energy metrical.According to the result of many places power network generaI investigation test, voltage
Transformer（PT）The error in dipping that secondary wiring pressure drop causes is maximum.Because PT secondary singals need cable transmission more long
Electric energy meter is connected to control room, transmission over long distances can produce very big pressure drop, also just generate very big error.This error is
Negative error, can cause very big economic loss for Utilities Electric Co..
Existing several solutions and the problem of presence are respectively：
1st, PT secondary circuit impedances are reduced.It is all feasible solution to shorten loop length and increase sectional area of wire, but real
Border operating difficulties.
2nd, PT secondary loop currents are reduced.Using single measure winding, single transfer wire can reduce loop
Electric current, but the quantity of cable will increase much therewith.
3rd, electronic installation compensation.Need to adjust offset according to field condition.But its poor reliability, does not have confidence level.
Use digital form instead（High-precision optical fiber digital switching system）Transmission signal ensure that signal transmission is not lost.Number
Word transmission needs to be digitized original analog signal, the letter after the reliability of digitized accuracy and equipment and recovery
Number error it is directly related.In data receiver, as a rule, the method for lifting sampled point using software is --- using inserting
Value, but, if using interpolation method in zero pressure drop system, the treatment of phase will be very complicated, so, generally using extrapolation
Method improve sampled point.Using this method of extrapolating, when containing harmonic wave in three-phase electricity, the waveform modification for recovering can be made
Seriously.
The content of the invention
It is stranded it is an object of the invention to solve to be lifted in existing zero pressure drop equipment the operation existing for the method for sampled point
Difficulty, treatment is complicated, poor reliability, and the waveform for being recovered is provided because of serious, the distortion level problem high containing harmonic wave, deformation
A kind of method that sampled point is lifted in zero pressure drop equipment.
The technical solution adopted in the present invention is：
A kind of method that sampled point is lifted in zero pressure drop equipment, according to current sampling point and relative to previous sampled point
Variable quantity, judgement where be currently at sine wave, and this position maximum variable quantity, with the maximum for finding
Variable quantity does amplitude limit, reduces the distortion level of waveform during containing harmonic wave, specifically includes following steps：
Step 1）, data receiver set up dynamic data receive form, it is stipulated that table content and A phases, B in three-phase electricity
Phase, the corresponding relation of C phases be,
A→DAC1
B→DAC2
C→DAC3；
Step 2）, etc. data to be received, after receiving data, judgement is A phases, B phases or C phases, and by A phases, B phases and C
Phase signals are respectively fed to DAC1, DAC2 and DAC3；
Step 3）, within a sampling period choose 220 sampled points, according to theoretical value calculate 219 segmentation maximums
Variable quantity：
I) calculates interpolation according to extrapolation algorithm：
A: xi xi+xi+xi+1......,=xi-xi-1
B: yi yi+yi+yi+1......,=yi-yi-1
C: zi zi+zi+zi+1......,=zi-zi-1；
Ii) is according to xi-1And xiValue, in xiTwo values are inserted below, sampled point quantity is increased to 220*3=660：
I-th moment： xi zi-1+yi-2+
The i+1 moment： yi+1 xi+zi-1+
I-th+2 moment： zi+2 yi+1+xi+；
Iii) the interpolated data that is calculated according to more than, obtains any time reception data xi, yi, ziLimitation change
Amount：
Lookup receives data xi, yi, ziThe affiliated section of sampled value：Multilevel iudge belongs to sine wave epimere lower half also
Section, judgement is incremented by trend or decline trend, specific to determine in which segmentation；
By the variable quantity of affiliated segmentation and the variable quantity of actual sample value（=xi- xi-1、=yi- yi-1、=zi-
zi-1）It is compared, chooses less, the limitation variable quantity being segmented as each in both, limit interpolation scope, suppresses harmonic wave.
The beneficial effects of the present invention are：The method for employing " limitation variable quantity ", effectively suppresses harmonic wave, reduces because containing
There is the distortion of waveform caused by harmonic wave.
Brief description of the drawings
Fig. 1 is the main-process stream of the specific embodiment of the method for lifting sampled point in the zero pressure drop equipment that the present invention is provided
Figure；
Fig. 2 be the present invention provide zero pressure drop equipment in lifted sampled point method specific embodiment in interrupt timing
The control flow chart of device.
Specific embodiment
The method that core of the invention is to provide lifting sampled point in a kind of zero pressure drop equipment.
To make the object, technical solutions and advantages of the present invention clearer, with reference to Figure of description to institute of the present invention
The method that sampled point is lifted in the zero pressure drop equipment of offer is further described.
Harmonic wave is to show as larger sawtooth occur in waveform, and the variable quantity between segmentation is bigger, and sawtooth is bigger, and harmonic wave is got over
Seriously, thus to reach suppress harmonic wave purpose, it is necessary to variable quantity constantly be modified.The present invention is solution using outer
This method is pushed away, when containing harmonic wave in three-phase electricity, the problem that the waveform modification for recovering can be made serious, and a kind of zero-pressure is provided
The method that sampled point is lifted in drop equipment：Judge according to current sampling point and relative to the variable quantity of previous sampled point
Where be currently at sine wave, and this position maximum variable quantity, do amplitude limit with the maximum variable quantity for finding,
To reduce the distortion level of waveform during containing harmonic wave.As shown in Figure 1, 2, it specifically includes following steps：
Step 1）, data receiver set up dynamic data receive form, it is stipulated that table content and A phases, B in three-phase electricity
Phase, the corresponding relation of C phases be,
A→DAC1
B→DAC2
C→DAC3；
Step 2）, etc. data to be received, the interruption of adc data that wait is received, specifically, the wait of setting timer
Time is 1016ms, and after receiving data, judgement is A phases, B phases or C phases, and A phases, B phases and C phase signals are respectively fed to
DAC1, DAC2 and DAC3；
Step 3）, within a sampling period choose 220 sampled points, according to theoretical value calculate 219 segmentation maximums
Variable quantity：
I) calculates interpolation according to extrapolation algorithm：
A: xi xi+xi+xi+1......,=xi-xi-1
B: yi yi+yi+yi+1......,=yi-yi-1
C: zi zi+zi+zi+1......,=zi-zi-1；
Ii) is according to xi-1And xiValue, in xiTwo values are inserted below, sampled point quantity is increased to 220*3=660：
I-th moment： xi zi-1+yi-2+
The i+1 moment： yi+1 xi+zi-1+
I-th+2 moment： zi+2 yi+1+xi+；
Iii) the interpolated data that is calculated according to more than, obtains any time reception data xi, yi, ziLimitation change
Amount：
Lookup receives data xi, yi, ziThe affiliated section of sampled value：Sine wave is updated according to instantaneous crest, valley value
Crest, trough, zero-bit, peak value, multilevel iudge belong to sine wave epimere lower semisection also, and judgement is incremented by trend and still successively decreases
Gesture is specific to determine in which segmentation；
By the variable quantity of affiliated segmentation and the variable quantity of actual sample value（=xi- xi-1、=yi- yi-1、=zi-
zi-1）It is compared, chooses less, the limitation variable quantity being segmented as each in both, obtains 219 maximum changes of segmentation
Change scale lattice, limit interpolation scope, suppress harmonic wave.
Checking embodiment of the invention is the foregoing is only, is not intended to limit the invention, it is all in the technology of the present invention thought
Lower made any modification, equivalent substitution and improvements etc., should be included within the scope of the present invention.
Claims (1)
1. a kind of method that sampled point is lifted in zero pressure drop equipment, it is characterised in that according to current sampling point and relative to preceding
Where one variable quantity of sampled point, judgement is currently at sine wave, and this position maximum variable quantity, with looking into
The maximum variable quantity for finding does amplitude limit, reduces the distortion level of waveform during containing harmonic wave, specifically includes following steps：
Step 1）, set up dynamic data in data receiver and receive form, it is stipulated that A phase, B phase, C phase in table content and three-phase electricity
Corresponding relation be,
A→DAC1
B→DAC2
C→DAC3；
Step 2）, etc. data to be received, after receiving data, judgement is A phases, B phases or C phases, and A phases, B phases and C are believed
Number it is respectively fed to DAC1, DAC2 and DAC3；
Step 3）, 220 sampled points are chosen within a sampling period, 219 maximum changes of segmentation are calculated according to theoretical value
Amount：
I) calculates interpolation according to extrapolation algorithm：
A: xi xi+ xi+ xi+1......, =xi-xi-1
B: yi yi+ yi+ yi+1......, =yi-yi-1
C: zi zi+ zi+ zi+1......, =zi-zi-1；
Ii) is according to xi-1And xiValue, in xiTwo values are inserted below, sampled point quantity is increased to 220*3=660：
I-th moment： xi zi-1+ yi-2+
The i+1 moment： yi+1 xi+ zi-1+
I-th+2 moment： zi+2 yi+1+ xi+；
Iii) the interpolated data that is calculated according to more than, obtains any time reception data xi, yi, ziLimitation variable quantity：
1. search and receive data xi, yi, ziThe affiliated section of sampled value：Multilevel iudge belongs to sine wave epimere lower semisection also,
Judgement is incremented by trend or decline trend, specific to determine in which segmentation；
2. by the variable quantity of affiliated segmentation and the variable quantity of actual sample value（=xi-xi-1、=yi-yi-1、=zi-zi-1）
It is compared, chooses less, the limitation variable quantity being segmented as each in both, limit interpolation scope, suppresses harmonic wave.
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| CN201410628205.4A CN104375003B (en) | 2014-11-10 | 2014-11-10 | The method that sampled point is lifted in zero pressure drop equipment |
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| CN104375003B true CN104375003B (en) | 2017-06-06 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101430360A (en) * | 2008-12-08 | 2009-05-13 | 国电南瑞科技股份有限公司 | Error data identification method for secondary equipment in electric power supply system |
| CN101729236A (en) * | 2009-12-07 | 2010-06-09 | 清华大学 | In-parallel interpolating device for fully digital receiver and method |
| CN102033215A (en) * | 2010-10-21 | 2011-04-27 | 深圳南瑞科技有限公司 | Method for detecting correctness of sampling value of electronic transformer |
| CN102721902A (en) * | 2012-06-28 | 2012-10-10 | 福建省电力有限公司莆田电业局 | Electric transmission line fault detection method based on voltage traveling wave prediction |
| CN103178851A (en) * | 2013-03-15 | 2013-06-26 | 苏州科技学院 | Novel sampling method for generating SPWM (sinusoidal pulse width modulation) control signals |
| CN103926462A (en) * | 2014-04-28 | 2014-07-16 | 东南大学 | Rapid harmonic wave analyzing method and device of power system |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009116917A (en) * | 2007-11-01 | 2009-05-28 | Canon Inc | Reproducing apparatus |
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101430360A (en) * | 2008-12-08 | 2009-05-13 | 国电南瑞科技股份有限公司 | Error data identification method for secondary equipment in electric power supply system |
| CN101729236A (en) * | 2009-12-07 | 2010-06-09 | 清华大学 | In-parallel interpolating device for fully digital receiver and method |
| CN102033215A (en) * | 2010-10-21 | 2011-04-27 | 深圳南瑞科技有限公司 | Method for detecting correctness of sampling value of electronic transformer |
| CN102721902A (en) * | 2012-06-28 | 2012-10-10 | 福建省电力有限公司莆田电业局 | Electric transmission line fault detection method based on voltage traveling wave prediction |
| CN103178851A (en) * | 2013-03-15 | 2013-06-26 | 苏州科技学院 | Novel sampling method for generating SPWM (sinusoidal pulse width modulation) control signals |
| CN103926462A (en) * | 2014-04-28 | 2014-07-16 | 东南大学 | Rapid harmonic wave analyzing method and device of power system |
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