CN107643444A - A kind of watt metering method and system based on linear time function - Google Patents
A kind of watt metering method and system based on linear time function Download PDFInfo
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- CN107643444A CN107643444A CN201710963689.1A CN201710963689A CN107643444A CN 107643444 A CN107643444 A CN 107643444A CN 201710963689 A CN201710963689 A CN 201710963689A CN 107643444 A CN107643444 A CN 107643444A
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Abstract
The invention discloses a kind of watt metering method and system based on linear time function.In existing watt metering method, if sample rate is not high enough, high-frequency harmonic can not be measured, causes error；If sample rate is low to be unsatisfactory for sampling thheorem, prefilter can be added, but high-frequency signal can be filtered, make signal skew, cause error.The generating and electrical equipment that the present invention is T for the modulation period that voltage is U, electric current is made up of index rising edge and trailing edge, electric current is sampled by measuring apparatus first, then solve to obtain line shape function relevant parameter by undetermined coefficient, time-domain function curve is determined, watt metering result is obtained finally by integral operation.The metering method of the present invention can avoid requiring that sample rate is high in traditional metering based on frequency domain, can not measure the problem of high-frequency signal, improve the accuracy of measuring.
Description
Technical field
The present invention relates to watt metering field, specifically a kind of watt metering method based on linear time function and
System.
Background technology
Electric energy is the main energy sources of national economy and people's lives, and electric energy measurement data is related to generating electricity, powers and electricity consumption
The economic interests of tripartite.With the development of modern industry, power system accesses excessive power electronic equipment, rectification converter
And other nonlinear loads, power network bring substantial amounts of harmonic current harmony wave voltage into, have had a strong impact on electric energy measurement data
Accuracy.
For flexible direct current system, its current waveform is generally made up of the index rising edge and trailing edge of fixed cycle, this
Kind waveform generally comprises a large amount of higher hamonic waves, particularly at flex point.Traditional watt metering method is based on frequency domain more, it is desirable to
Sample rate is high.If sample rate is not high enough, high-frequency harmonic can not be measured, causes error.If sample rate is low to be unsatisfactory for sampling thheorem,
Prefilter can be added, but high-frequency signal can be filtered, make signal skew, cause error.
The content of the invention
The technical problems to be solved by the invention are the defects of overcoming above-mentioned prior art to exist, there is provided one kind is based on linear
The watt metering method of time-domain function, to improve the accuracy of measuring.
Therefore, the present invention adopts the following technical scheme that：A kind of watt metering method based on linear time function, its pin
It is U to voltage, the generating that the modulation period that electric current is made up of index rising edge and trailing edge is T and electrical equipment, passes through measurement
Equipment samples to electric current, then solves to obtain linear function relevant parameter by undetermined coefficient, determines time-domain function curve,
Watt metering result is obtained finally by integral operation.
As the supplement of above-mentioned technical proposal, it comprises the following steps：
Step 1), electric current to be measured is sampled with 4/T sample rate, obtains sample point data, takes in a cycle and adopts
Sampling point I (i), i=1,2,3,4, it is initial time to take I (1) points, then t (i)=i*T/4, i=0,1,2,3；
Step 2), 4 sampling point value sizes of multilevel iudge, obtain two maximum and second largest sampled points of numerical value；If
For the 1st, 2 sampled points, then into step 3)；If the 2nd, 3 sampled points, then into step 4)；If the 3rd, 4 sampled points, then enter
Enter step 5)；
Step 3), the 3rd, 4 sample point datas are first taken, substitute into I=Ct+D, then obtain C, D, it is the 5th sampled point to take t=T points,
The 1st, 5 sample point datas are substituted into I=At+B again, A, B is obtained, entire time domain function curve is produced, into step 6)；
Step 4), first takes the 3rd, 4 sample point datas, substitutes into I=Ct+D, then C, D, then by the 1st, 2 sample point data generations
Enter I=At+B, obtain A, B, entire time domain function curve is produced, into step 6)；
Step 5), the 1st, 2 sample point datas are first taken, substitute into I=At+B, then obtain A, B, it is the 5th sampled point to take t=0 points,
The 4th, 5 sample point datas are substituted into I=Ct+D again, C, D is obtained, entire time domain function curve is produced, into step 6)；
Step 6), watt metering result is obtained by the integral operation of following formula：
It is a further object of the present invention to provide a kind of watt metering system based on linear time function, it includes：
Using module：The generating for being T for the modulation period that voltage is U, electric current is made up of index rising edge and trailing edge
And electrical equipment, electric current is sampled by measuring apparatus；
Time-domain function curve determining module：Solve to obtain linear function relevant parameter by undetermined coefficient, determine time domain letter
Number curve；
Watt metering result computing module：Watt metering result is obtained by integral operation.
Compared with prior art, the method have the advantages that：For voltage constant, electric current is index rising edge with
There are a large amount of higher hamonic waves in drop, along the generating and electrical equipment, electric current that the modulation period formed is T by based on linear time letter
Several methods avoids to measure and requires that sample rate is high in traditional metering based on frequency domain, can not measure asking for high-frequency signal
Topic, improves the accuracy of measuring.
Brief description of the drawings
Fig. 1 is the flow chart of the watt metering method of the embodiment of the present invention 1；
Fig. 2 is the simplified model structure chart of DC/DC transverters in the embodiment of the present invention 1.
Embodiment
With reference to Figure of description and specific embodiment, the present invention is further described.
Embodiment 1
The present embodiment provides a kind of watt metering method based on linear time function, as shown in figure 1, it is for voltage
U, generating and the electrical equipment that the modulation period that electric current is made up of index rising edge and trailing edge is T, by measuring apparatus to electricity
Stream is sampled, and is comprised the following steps：
Step 1), electric current to be measured is sampled with 4/T sample rate, obtains sample point data, takes in a cycle and adopts
Sampling point I (i), i=1,2,3,4, it is initial time to take I (1) points, then t (i)=i*T/4, i=0,1,2,3；
Step 2), 4 sampling point value sizes of multilevel iudge, obtain two maximum and second largest sampled points of numerical value；If
For the 1st, 2 sampled points, then into step 3)；If the 2nd, 3 sampled points, then into step 4)；If the 3rd, 4 sampled points, then enter
Enter step 5)；
Step 3), the 3rd, 4 sample point datas are first taken, substitute into I=Ct+D, then obtain C, D, it is the 5th sampled point to take t=T points,
The 1st, 5 sample point datas are substituted into I=At+B again, A, B is obtained, entire time domain function curve is produced, into step 6)；
Step 4), first takes the 3rd, 4 sample point datas, substitutes into I=Ct+D, then C, D, then by the 1st, 2 sample point data generations
Enter I=At+B, obtain A, B, entire time domain function curve is produced, into step 6)；
Step 5), the 1st, 2 sample point datas are first taken, substitute into I=At+B, then obtain A, B, it is the 5th sampled point to take t=0 points,
The 4th, 5 sample point datas are substituted into I=Ct+D again, C, D is obtained, entire time domain function curve is produced, into step 6)；
Step 6), watt metering result is obtained by the integral operation of following formula：
Application examples
Fig. 2 show the simplified model of a DC/DC transverter, and the inventive method is calculated in metering device.Mould
Analog quantity acquisition module connects output circuit by voltage transformer summation current transformer, then by central processing unit for processing,
It is ultimately stored on memory cell.
Metering device obtains sample point data by analogue collection module, obtains sampled point I (i) in a cycle, i=
1,2,3,4, it is initial time to take I (1) points, then t (i)=i*T/4, i=0,1,2,3；Then by CPU by treating
Determine Y-factor method Y and try to achieve exponential function undetermined coefficient A, B, C, D, you can obtain full linear function curve, and obtained by integral operation
0 arrives the watt metering result at T moment, finally by watt metering data storage in memory cell.
Watt metering method of the present invention based on index time-domain function, can be used for various electricity in flexible direct current system
The watt metering of source and load side.
Embodiment 2
The present embodiment provides a kind of watt metering system based on linear time function, including：
Using module：The generating for being T for the modulation period that voltage is U, electric current is made up of index rising edge and trailing edge
And electrical equipment, electric current is sampled by measuring apparatus；
Time-domain function curve determining module：Solve to obtain linear function relevant parameter by undetermined coefficient, determine time domain letter
Number curve；
Watt metering result computing module：Watt metering result is obtained by integral operation.
Although present disclosure is discussed in detail by above preferred embodiment, but it should be appreciated that above-mentioned
Description is not considered as limitation of the present invention.After those skilled in the art have read the above, for the present invention's
A variety of modifications and substitutions all will be apparent.Therefore, protection scope of the present invention should be limited to the appended claims.
Claims (3)
- A kind of 1. watt metering method based on linear time function, it is characterised in that for voltage be U, electric current is by index Generating and electrical equipment of the modulation period of edge and trailing edge composition for T are risen, electric current is sampled by measuring apparatus, then Solve to obtain linear function relevant parameter by undetermined coefficient, determine time-domain function curve, electricity is obtained finally by integral operation Spend metric results.
- 2. watt metering method according to claim 1, it is characterised in that comprise the following steps：Step 1), electric current to be measured is sampled with 4/T sample rate, obtains sample point data, take sampled point I in a cycle (i), i=1,2,3,4, it is initial time to take I (1) points, then t (i)=i*T/4, i=0,1,2,3；Step 2), 4 sampling point value sizes of multilevel iudge, obtain two maximum and second largest sampled points of numerical value；If 1st, 2 sampled point, then into step 3)；If the 2nd, 3 sampled points, then into step 4)；If the 3rd, 4 sampled points, then enter step It is rapid 5)；Step 3), the 3rd, 4 sample point datas are first taken, substitute into I=Ct+D, then obtain C, D, it is the 5th sampled point to take t=T points, then will 1st, 5 sample point datas substitute into I=At+B, obtain A, B, entire time domain function curve are produced, into step 6)；Step 4), the 3rd, 4 sample point datas are first taken, substitute into I=Ct+D, then obtain C, D, then the 1st, 2 sample point datas are substituted into I= At+B, A, B are obtained, entire time domain function curve is produced, into step 6)；Step 5), the 1st, 2 sample point datas are first taken, substitute into I=At+B, then obtain A, B, it is the 5th sampled point to take t=0 points, then will 4th, 5 sample point datas substitute into I=Ct+D, obtain C, D, entire time domain function curve are produced, into step 6)；Step 6), watt metering result is obtained by the integral operation of following formula：<mrow> <mi>P</mi> <mo>=</mo> <msubsup> <mo>&Integral;</mo> <mn>0</mn> <mi>T</mi> </msubsup> <mi>U</mi> <mi>I</mi> <mi>d</mi> <mi>t</mi> <mo>=</mo> <mi>U</mi> <msubsup> <mo>&Integral;</mo> <mn>0</mn> <mi>T</mi> </msubsup> <mi>I</mi> <mi>d</mi> <mi>t</mi> <mo>.</mo> </mrow>
- A kind of 3. watt metering system based on linear time function, it is characterised in that including：Using module：The generating for being T for the modulation period that voltage is U, electric current is made up of index rising edge and trailing edge and use Electric equipment, electric current is sampled by measuring apparatus；Time-domain function curve determining module：Solve to obtain linear function relevant parameter by undetermined coefficient, determine time-domain function song Line；Watt metering result computing module：Watt metering result is obtained by integral operation.
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Cited By (2)
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| CN109100674A (en) * | 2018-05-28 | 2018-12-28 | 国网江西省电力有限公司电力科学研究院 | A kind of metering method based on distribution type electric energy, error detection method and device |
| CN110261676A (en) * | 2019-05-05 | 2019-09-20 | 南瑞集团有限公司 | A kind of uncertain index time-domain function watt metering method of initial time |
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| CN110261676A (en) * | 2019-05-05 | 2019-09-20 | 南瑞集团有限公司 | A kind of uncertain index time-domain function watt metering method of initial time |
| CN110261676B (en) * | 2019-05-05 | 2021-10-19 | 南瑞集团有限公司 | Method for metering electric quantity of exponential time domain function with uncertain initial time |
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