CN104808038A - Method for improving alternating current sampling frequency through soft simulation interpolation - Google Patents
Method for improving alternating current sampling frequency through soft simulation interpolation Download PDFInfo
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- CN104808038A CN104808038A CN201510155256.4A CN201510155256A CN104808038A CN 104808038 A CN104808038 A CN 104808038A CN 201510155256 A CN201510155256 A CN 201510155256A CN 104808038 A CN104808038 A CN 104808038A
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- 238000005070 sampling Methods 0.000 title claims abstract description 37
- 238000000034 method Methods 0.000 title claims abstract description 31
- 238000004088 simulation Methods 0.000 title claims abstract description 17
- 238000004458 analytical method Methods 0.000 claims abstract description 9
- 238000003780 insertion Methods 0.000 claims description 23
- 230000037431 insertion Effects 0.000 claims description 23
- 238000004364 calculation method Methods 0.000 claims description 5
- 238000005094 computer simulation Methods 0.000 claims description 4
- 230000005611 electricity Effects 0.000 description 9
- 238000005259 measurement Methods 0.000 description 4
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Abstract
The invention discloses a method for improving alternating current sampling frequency through soft simulation interpolation, and belongs to the technical field of power automatic alternating current collection. The method comprises the following steps: firstly analyzing and calibrating collected alternating current sampling points through alternating current sinusoidal or cosine relation; then selecting any two continuous sampling points A and B after the calibration step; interpolating n points between the two sampling points according to a time halving mode; finally taking time as abscissa and actual sampling point amplitude value and the amplitude yi of the interpolation point i calculated by the step (2) as ordinate to form an alternating current sampling curve after interpolation. Simulation points are interpolated into the actual sampling points, so the alternating current sampling frequency is improved, the sampling precision is improved, and the wide application of functions such as integral electric quantity and dynamic electric energy analysis is facilitated.
Description
Technical field
The present invention relates to power automation AC Data field, be specifically related to a kind of method that soft simulation interpolation promotes AC sampling frequency.
Background technology
Of ac is captured in Automation of Electric Systems the vital task being responsible for and analog quantity being converted into digital quantity, and be the basis realizing Automation of Electric Systems, the precision of sampling and reliability directly affect the reliability and stability of whole system.Of ac comprises electric current, voltage, meritorious, idle, electricity etc., determines that the factor of these of ac sampling precisions mainly comprises following three aspects:
(1) sample devices sampling precision;
(2) sample devices computational accuracy;
(3) AC sampling frequency.
At present, equipment sampling precision reaches higher level, and equipment computing method are also very ripe, and equipment AC sampling frequency limited, in hardware device, therefore significantly promotes Alternating Current Sampling Precision difficulty larger under present circumstances.Along with the development in an all-round way of Intelligent transformer station, Alternating Current Sampling Precision problem is exaggerated, Intelligent transformer station is owing to being limited to network and equipment, per second of merge cells adopts 4000 times, be equivalent to each interchange cycle and only gather 80 times, every 4.5 degree of collections 1 time, such acquisition mode directly causes the of ac precision that collects lower, PMU curve cannot be applied at dispatching terminal, and device electricity cannot be applied to electric energy statistics.
In prior art, the computing method of device electricity are comparatively simple, and mainly comprise two kinds, be Rectangular Method and straight line connection method respectively, concrete process as shown in Figures 2 and 3.
The enforcement of the present invention in device electricity is concrete as shown in Figure 4.By adopting soft simulation interpolation method of the present invention, eliminate abnormity point, upper zone (I) and region (II) two parts area is added compared to Rectangular Method precision, the area of topmost region (II) is added relative to straight-line method, General Promotion accuracy, thus make device electricity more accurately and reliably.
Summary of the invention
In order to overcome the weak point that the of ac acquisition precision existed in prior art is difficult to improve, the invention provides a kind of method being promoted AC sampling frequency by soft simulation interpolation, the method improves AC sampling frequency by soft simulation interpolation, and sampled data error is little, accurately and reliably.
For achieving the above object, the technical solution used in the present invention is as follows:
Promoted a method for AC sampling frequency by soft simulation interpolation, the method comprises the steps:
(1) analysis of actual samples point and calibration:
Arbitrary continuation seven sampled points are chosen in the AC sampling point gathered, analytic set is carried out to middle sampled point, process is: by exchanging just (remaining) string relation, respectively according to above 3 and below 3 extrapolate six different amplitudes of this intermediate samples point; First, calculate the difference DELTA y of maximum amplitude and minimum amplitude, then all the other 4 amplitudes extrapolated are averaged, calculate the difference of the actual sample value of this mean value and intermediate point again, and ask its absolute value to be a, if a > 2 Δ y, then intermediate samples point is directly replaced with the mean value calculated; If a≤2 Δ y, then intermediate samples point need not be replaced; According to said method, analytic set is carried out to all sampled points.
(2) interpolation calculation:
Choose any two continuous print sampled point A and B, according to point modes such as times, between two sampled points, insert n point, be specially: according to interchange just (remaining) string relation, extrapolate each insertion point amplitude y by A point
ai, extrapolate each insertion point amplitude y by B point
bi; The amplitude y of insertion point i is calculated again according to formula (1)
i;
In formula (1): y
ifor the amplitude of insertion point i; I=1,2,3 ..., n-1, n;
Y
aifor the amplitude of insertion point i extrapolated by exchanging just (remaining) string relation by A point;
Y
bifor the amplitude of insertion point i extrapolated by exchanging just (remaining) string relation by B point;
(3) computer simulation emulation:
Take time as horizontal ordinate, with actual samples point amplitude and the amplitude y of insertion point i that calculates according to step (2)
ifor ordinate, form the AC sampling curve after interpolation.
Compared to prior art, advantage of the present invention and beneficial effect as follows:
1, actual AC sampling erroneous point is calibrated by the analysis of actual samples point and calibration by the present invention.
2, computer simulation emulation by computer technology, actual acquisition point and simulation is inserted collection point to unify layout, finally forms complete collection curve.Existing research direction all concentrates on to promote and exchanges actual samples frequency aspect, the present invention then by inserting analog simulation point between actual samples point, namely in the middle of two actual AC sampling points, multiple soft simulation alternating data acquisition is inserted, thus significantly promote AC sampling frequency, improve sampling precision, this alternating data acquisition application performance is significantly improved, is convenient to the widespread use of the function such as device electricity and dynamic electric energy analysis.
Accompanying drawing explanation
Fig. 1 is hyperbolic curve of the present invention coordinate correlation technique graph of a relation anyhow.
Fig. 2 is Rectangular Method device electricity figure.
Fig. 3 is straight line connection method device electricity figure.
Fig. 4 is the enforcement of soft simulation method of interpolation in device electricity.
Fig. 5 is not for adopt wide area measurement analytic curve of the present invention.
Fig. 6 is for adopting wide area measurement analytic curve of the present invention.
Embodiment
Below by way of drawings and Examples in detail the present invention is described in detail.
The present invention promotes AC sampling frequency by soft simulation interpolation, and detailed process is as follows:
(1) analysis of actual samples point and calibration:
Arbitrary continuation seven sampled points are chosen in the AC sampling point gathered, analytic set is carried out to middle sampled point, process is: by exchanging just (remaining) string relation, respectively according to above 3 and below 3 extrapolate six different amplitudes of this intermediate samples point respectively; First calculate the difference DELTA y of wherein maximum amplitude and minimum amplitude, then all the other four amplitudes extrapolated are averaged, calculate the difference of the actual sample value of this mean value and intermediate point again, absolute value difference is asked to be a, if a > 2 Δ y, then intermediate samples point is directly replaced with the mean value calculated; If a≤2 Δ y, then intermediate samples point need not be replaced, and still adopts its actual magnitude; According to said method, analytic set is carried out to all sampled points.
(2) interpolation calculation:
As shown in Figure 1, choose any two through step (1) calibration after continuous print sampled point A (A point amplitude y
a) and B (B point amplitude y
b), according to point modes such as times, between two sampled points, insert n point, be specially: according to interchange just (remaining) string relation, extrapolate each insertion point amplitude y by A point
ai, take time as horizontal ordinate, each insertion point amplitude y extrapolated by A point
aifor ordinate, set up curve A; Each insertion point amplitude y is extrapolated by B point
bi, take time as horizontal ordinate, each insertion point amplitude y extrapolated by B point
bifor ordinate, set up curve B; The amplitude y of insertion point i is calculated again according to formula (1)
i.
In formula (1): y
ifor the amplitude of insertion point i; I=1,2,3 ..., n-1, n;
Y
aifor the amplitude of insertion point i extrapolated by exchanging just (remaining) string relation by A point;
Y
bifor the amplitude of insertion point i extrapolated by exchanging just (remaining) string relation by B point;
(3) computer simulation emulation:
Take time as horizontal ordinate, with actual samples point amplitude and the amplitude y of insertion point i that calculates according to step (2)
ifor ordinate, form the AC sampling curve C (Fig. 1) after interpolation.All interpolation in the middle of two actual samples points, all non-actual sample value, all being converted by computing machine and produce, is virtual emulation sampled point.
Embodiment 1
The present embodiment is the enforcement of the present invention in integration electric energy information gathers.
Embodiment 2
The present embodiment is the enforcement of the present invention in the information acquisition of electrical network wide area measurement.
Electrical network wide area measurement information is electrical network multidate information, and accuracy requirement is higher, and current Intelligent transformer station does not have 4.5 degree to gather 1 point, if collection point, the two ends time difference of a circuit will be formed as shown in Figure 5, Synchronization Analysis time error is larger.
Adopt the present invention, in the middle of two actual measured values, add four simulation points, then pass through just (remaining) chord curve tracking technique, as shown in Figure 6, Synchronization Analysis time error is less.
Above-described embodiment is specifically described the present invention, is just further described the present invention, and not limit the invention to these particular implementation.To one skilled in the art, under the framework of the principle of the invention and thinking and other changes and improvements made in right all should belong to protection scope of the present invention.
Claims (2)
1. soft simulation interpolation promotes a method for AC sampling frequency, it is characterized in that: the method comprises the steps:
(1) analysis of actual samples point and calibration:
By AC sine or cosine relation, the AC sampling point gathered is analyzed and calibrated;
(2) interpolation calculation:
Choose any two continuous print sampled point A and B after step (1) calibration, according to point modes such as times, between two sampled points, insert n point, be specially: according to AC sine or cosine relation, extrapolate each insertion point amplitude y by A point
ai, extrapolate each insertion point amplitude y by B point
bi; The amplitude y of insertion point i is calculated again according to formula (1)
i;
In formula (1): y
ifor the amplitude of insertion point i; I=1,2,3 ..., n-1, n;
Y
aifor the amplitude of insertion point i extrapolated by exchanging just (remaining) string relation by A point;
Y
bifor the amplitude of insertion point i extrapolated by exchanging just (remaining) string relation by B point;
(3) computer simulation emulation:
Take time as horizontal ordinate, with actual samples point amplitude and the amplitude y of insertion point i that calculates according to step (2)
ifor ordinate, form the AC sampling curve after interpolation.
2. soft simulation interpolation according to claim 1 promotes the method for AC sampling frequency, it is characterized in that: in step (1) to actual samples point analysis and calibration process be: in the AC sampling point gathered, choose arbitrary continuation seven sampled points, analytic set is carried out to middle sampled point, process is: by AC sine or cosine relation, respectively according to above 3 and below 3 extrapolate six different amplitudes of this intermediate samples point; First, calculate the difference DELTA y of maximum amplitude and minimum amplitude, then all the other 4 amplitudes extrapolated are averaged, calculate the difference of the actual magnitude of this mean value and intermediate samples point again, absolute value is asked to be a to it, if a > 2 Δ y, then the actual magnitude of the intermediate samples point mean value calculated is replaced; If a≤2 Δ y, then the actual magnitude of intermediate samples point need not be replaced; According to said method, analytic set is carried out to all sampled points.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106849951A (en) * | 2017-01-24 | 2017-06-13 | 浙江大学 | Low-and high-frequency signal finite time mixing acquisition method based on multipath A/D converter |
| CN111753003A (en) * | 2020-04-27 | 2020-10-09 | 宁波三星医疗电气股份有限公司 | Method for improving data reporting success rate of concentrator |
| CN115598416A (en) * | 2022-09-16 | 2023-01-13 | 珠海多创科技有限公司（Cn） | Method and system for processing station area sampling signal, storage medium and computer equipment |
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| CN104102831A (en) * | 2014-07-09 | 2014-10-15 | 国电南瑞科技股份有限公司 | Interpolation sampled value protection method |
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| CN102353500A (en) * | 2011-06-03 | 2012-02-15 | 上海师范大学 | Extraction method of unbalanced signal for dynamic balance measurement |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106849951A (en) * | 2017-01-24 | 2017-06-13 | 浙江大学 | Low-and high-frequency signal finite time mixing acquisition method based on multipath A/D converter |
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| CN111753003B (en) * | 2020-04-27 | 2023-11-07 | 宁波三星医疗电气股份有限公司 | Method for improving success rate of reporting data of concentrator |
| CN115598416A (en) * | 2022-09-16 | 2023-01-13 | 珠海多创科技有限公司（Cn） | Method and system for processing station area sampling signal, storage medium and computer equipment |
| CN115598416B (en) * | 2022-09-16 | 2024-01-30 | 珠海多创科技有限公司 | Processing method, system, storage medium and computer equipment for area sampling signal |
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Effective date of registration: 20200331 Address after: 39-7 Siping Street, Heping District, 110006, Liaoning, Shenyang Co-patentee after: STATE GRID CORPORATION OF CHINA Patentee after: STATE GRID CORPORATION OF CHINA Address before: 116001 A, block 181, Asia Fashion apartment, 809 democracy Road, Heping District, Liaoning, Shenyang Patentee before: Wang Shunjiang |