CN103901292A - Data sampling interpolation method - Google Patents
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- CN103901292A CN103901292A CN201310640522.3A CN201310640522A CN103901292A CN 103901292 A CN103901292 A CN 103901292A CN 201310640522 A CN201310640522 A CN 201310640522A CN 103901292 A CN103901292 A CN 103901292A
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Abstract
The invention provides a data sampling interpolation method. The method comprises the following steps that first, interpolation is carried out, second, different sampling interpolation algorithms are selected, eighty sampling values obtained through ECT sampling and EPT sampling in each cycle can be expanded to obtain two hundred sampling values, and therefore the requirements for carrying out power quality calculation on power quality basic parameters can be met. According to the data sampling interpolation method, data can be sampled in a power quality monitoring device and can be processed, a data receiving end achieves sampling synchronization based on a synchronization scheme of the sampling interpolation algorithms under the premise of not increasing the number of original devices, and the reliability of a system is improved greatly due to the fact that the dependence on synchronizing signals is eliminated.
Description
Technical field
The present invention relates to a kind of data sampling interpolation method.
Background technology
In the time there is the deviation of voltage, electric current or frequency in electrical network, can cause load capacity and the hydraulic performance decline of consumer, even can cause consumer cisco unity malfunction.Therefore improving electric energy quality monitoring level and on-line analysis ability has become important content and the index of domestic and international power industry.Digital transformer substation requires real-time electric parameters and the quantity of state collection of equipment for monitoring power quality to have higher sample frequency, could quality of power supply event be analyzed accurately and be processed.AC sampling is that the instantaneous value of measured signal is sampled, and then sampled value is carried out to analytical calculation and obtains measured information.The sampling rate of AC sampling requires high, program calculated amount is relatively large, but contained containing much information in its sampled value, can obtain the much information (as effective value, phase place, harmonic component etc.) that we are concerned about by different algorithms, real-time is good. and hardware is simple, becomes the main sample mode using at present.In digital intelligent transformer station, the sampled value sequence obtaining from ECT, EPT, its sample frequency may be different, for equipment for monitoring power quality, to adapt to different sample frequency, just must adopt definite sampling algorithm.
Summary of the invention
The present invention proposes a kind of data sampling interpolation method, it can be in equipment for monitoring power quality sampled data data are processed, and synchronization scenario based on interpolation algorithm is not increasing under the prerequisite of original device number, data receiver is realized sample-synchronous, due to the dependence of having eliminated synchronizing signal, thereby significantly improve the reliability of system.
The present invention has adopted following technical scheme: a kind of data sampling interpolation method, and it comprises the following steps: step 1, first this data sampling interpolation method carries out interpolation; Step 2, selects different sample interpolation algorithms, the each cycle being obtained 80 point sampling value expansions can be obtained to 200 point sampling values, thereby reach the requirement of quality of power supply basic parameter being carried out to quality of power supply calculating by ECT, EPT sampling.
Data sampling interpolation method described in step 1 of the present invention is to carry out interpolation according to the time interval of sampled data.Data sampling interpolation method of the present invention is chosen ten cycles and is calculated.
The present invention has following beneficial effect: adopted after above technical scheme, the present invention can be in equipment for monitoring power quality sampled data data are processed, and synchronization scenario based on interpolation algorithm is not increasing under the prerequisite of original device number, data receiver is realized sample-synchronous, due to the dependence of having eliminated synchronizing signal, thereby significantly improve the reliability of system.The present invention can be used for electric energy quality on-line monitoring device.This interpolation method carries out interpolation according to the time interval of sampled data, select different sample interpolation algorithms, the each cycle being obtained by ECT, EPT sampling 80 point sampling value expansions can be obtained to 200 point sampling values, thereby reach the requirement of quality of power supply basic parameter being carried out to quality of power supply calculating.
Brief description of the drawings
Fig. 1 is the process flow diagram of data sampling interpolation method of the present invention.
Embodiment
In Fig. 1, the invention provides a kind of data sampling interpolation method, it comprises the following steps: step 1, first this data sampling interpolation method carries out interpolation, and data sampling interpolation method is to carry out interpolation according to the time interval of sampled data; Step 2, select different sample interpolation algorithms, the each cycle being obtained by ECT, EPT sampling 80 point sampling value expansions can be obtained to 200 point sampling values, thereby reach the requirement of quality of power supply basic parameter being carried out to quality of power supply calculating, data sampling interpolation method of the present invention is chosen ten cycles and is calculated.
Further illustrate data sampling interpolation method of the present invention below by embodiment: ECT of the present invention, EPT sampling obtains the digital quantity of sample frequency 4000Hz, be 80 sampled points of every cycle, this equipment for monitoring power quality is according to quality of power supply standard, choose 200 sampled points of every cycle, carry out quality of power supply calculating.Therefore need the quadratic interpolation of sampling, when demand sampling rate is greater than and non-integral multiple during in former sampling rate, need carry out non-integral multiple " extraction " to high-speed sampling data, and obtain the compensation rate at each sample interpolation interval according to markers, it strengthens the applicability of IED, and implementation method is versatile and flexible.
The present invention carries out interpolation according to the time interval of sampled data, and its interpolation method step is as follows:
1, ECT, EPT are sampled 80 sampled points of every cycle that obtain are designated as:
, its sampled value is designated as:
; 200 sampled points of every cycle that required interpolation obtains are designated as:
, its sampled value is:
.
2, according to the time interval of sampled data, each cycle is divided into 200 intervals, establishing the time interval is h,
; Suppose the sampling interval obtaining by markers and standard sample interlude is poor is
, and establish
, according to linear interpolation, have:
。
3, in like manner can obtain, when
time,
。
4, each sampled point is repeated to interpolation calculation, extremely
, every cycle sampled data is 200 points by 80 point interpolations, puts into data buffer area, can carry out next step calculating.
5, get ten cycle data and carry out basic quality of power supply calculating, and then can obtain whole power quality parameter result of calculation.
Claims (3)
1. a data sampling interpolation method, it comprises the following steps:
Step 1, first this data sampling interpolation method carries out interpolation;
Step 2, selects different sample interpolation algorithms, the each cycle being obtained 80 point sampling value expansions can be obtained to 200 point sampling values, thereby reach the requirement of quality of power supply basic parameter being carried out to quality of power supply calculating by ECT, EPT sampling.
2. data sampling interpolation method according to claim 1, is characterized in that the interpolation method of data sampling described in step 1 is to carry out interpolation according to the time interval of sampled data.
3. data sampling interpolation method according to claim 1, is characterized in that, described data sampling interpolation method is chosen ten cycles and calculated.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111443641A (en) * | 2020-04-20 | 2020-07-24 | 英华达（上海）科技有限公司 | Sampling rate correction method, system, device and storage medium |
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|---|---|---|---|---|
| CN111443641A (en) * | 2020-04-20 | 2020-07-24 | 英华达（上海）科技有限公司 | Sampling rate correction method, system, device and storage medium |
| CN111443641B (en) * | 2020-04-20 | 2021-03-02 | 英华达（上海）科技有限公司 | Sampling rate correction method, system, device and storage medium |
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