CN112782460A - Method for calculating effective value of alternating voltage - Google Patents
Method for calculating effective value of alternating voltage Download PDFInfo
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- CN112782460A CN112782460A CN201911065474.3A CN201911065474A CN112782460A CN 112782460 A CN112782460 A CN 112782460A CN 201911065474 A CN201911065474 A CN 201911065474A CN 112782460 A CN112782460 A CN 112782460A
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- 238000000034 method Methods 0.000 title abstract description 9
- 238000005070 sampling Methods 0.000 claims abstract description 6
- 238000009825 accumulation Methods 0.000 claims abstract description 4
- 230000035508 accumulation Effects 0.000 claims abstract description 4
- 238000004364 calculation method Methods 0.000 claims description 7
- 238000013500 data storage Methods 0.000 description 5
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
- G01R19/2506—Arrangements for conditioning or analysing measured signals, e.g. for indicating peak values ; Details concerning sampling, digitizing or waveform capturing
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Abstract
The invention provides a method for calculating an effective value of alternating voltage, which comprises the following steps of 1, S1, sampling an alternating voltage AD value, and continuously collecting 2N data within t time, wherein U0, U U1... U2N; s2, calculating the effective value of the alternating current,
s3, clearing data, and clearing the sum of squares of N data accumulations in the last period; and S4, repeating the steps S2 and S3, and avoiding the accumulated error in the original scheme because the effective value of the latest period is always calculated.
Description
Technical Field
The invention mainly relates to the field of calculation of an effective value of alternating voltage, in particular to a method for calculating the effective value of the alternating voltage.
Background
The effective value of the alternating current is defined according to the thermal effect of the current and is calculated according to the formula
The prior art is as follows: sampling an alternating voltage AD value in each high-precision T time period, continuously acquiring N data in N periods, forming array storage with a period T being N x T, wherein the data storage form is shown in figure 1, theoretically, the N +1 th data is equal to the 0 th data, and the data storage method is characterized in that the N +1 th data is used for replacing the 0 th data in the data storage process, and the like:
when the number of the accumulated data exceeds N, the current latest value is accumulated, and the data at the position of the previous period is subtracted at the same time, so that the accumulated square sum is obtained in the low-precision working period, and the effective value is calculated.
In China, the theoretical period of the power grid voltage is 50Hz, but the theoretical period actually fluctuates slightly, when the power grid voltage fluctuates, the Nth data is not equal to the 0 th data, errors are introduced into an accumulated value by adding the current Nth value and subtracting the 0 th data during accumulation calculation, the errors are calculated from an effective value, and after long-time operation, the errors are accumulated, so that the phenomenon of inaccurate calculation is caused.
Disclosure of Invention
The invention provides a method for calculating an effective value of alternating voltage under high-speed sampling, which is characterized in that under a long-term running state, the effective value of the grid voltage calculates the error, and the following technical scheme is adopted:
s1, sampling an AC voltage AD value, and continuously collecting 2N data, U, in t time0、U1......U2N-1；
S2, calculating the effective value of the alternating current,
s3, clearing data, and clearing the sum of squares of N data accumulations in the last period;
and S4, repeating the steps S2 and S3.
Preferably, in S1, when the period is not fluctuated, U is equal to U for the 2 × N data and the 0 th data0＝U2N。
Preferably, in S2, the square sum of N data before the current position is calculated and then URms is calculated at the position where the data is currently stored in the work cycle.
Because the latest effective value of one period is always calculated, the accumulated error in the original scheme is avoided.
The invention has the beneficial effects that: the method comprises the steps of continuously collecting 2 x N data in a period t, calculating the sum of squares of N data before the position of the currently stored data in the period, and URms, clearing the sum of squares of the accumulated data after calculation, checking the updated position of the current data after clearing, and calculating the sum of squares and effective values.
And in the next period, checking the updated position of the current data, calculating the square sum and the effective value, and clearing the square sum. Because the latest effective value of one period is always calculated, the accumulated error in the original scheme is avoided.
Drawings
FIG. 1 is a diagram of a prior art manner of data storage;
fig. 2 shows a data storage method of the present patent application.
Detailed Description
The patent application adopts the following steps: s1, sampling an AC voltage AD value in each high-precision t time period, and continuously collecting 2N data, U0、U1......U2N-1(ii) a FIG. 2 is a schematic illustration;
s2, calculating the effective value of the alternating current,
s3, clearing the data, and clearing the sum of squares accumulated by the N data in the previous period after the effective value is calculated;
and S4, repeating the steps S2 and S3, namely looking at the updated position of the current data in the next period, calculating the square sum and the effective value, and clearing the square sum.
Preferably, in S1, when the period is not fluctuated, the 2 × N data and the 0 th data are equal, and U is0＝U2N
Preferably, in S2, the position of the currently stored data in the high-precision period is checked in the low-precision working period, the sum of squares of N data before the current position is calculated, and then URms is calculated.
Because the latest effective value of one period is always calculated, the accumulated error in the original scheme is avoided.
The above-described embodiments are merely illustrative of the principles and utilities of the present patent application and are not intended to limit the present patent application. Modifications and variations can be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of this patent application. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical concepts disclosed in the present application shall be covered by the claims of this patent application.
Claims (3)
1. An alternating voltage effective value calculation method is characterized in that: s1, sampling an AC voltage AD value, and continuously collecting 2N data, U, in t time0、U1......U2N-1；
S2, calculating the effective value of the alternating current,
s3, clearing data, and clearing the sum of squares of N data accumulations in the last period;
and S4, repeating the steps S2 and S3.
2. An effective value calculation method for an alternating voltage according to claim 1, wherein: in S1, when the period does not fluctuate, U is equal to the 2 × N data and the 0 th data0＝U2N。
3. An effective value calculation method for an alternating voltage according to claim 1, wherein: in S2, the square sum of N data before the current position is calculated at the current position of the stored data in the operation cycle, and URms is calculated.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911065474.3A CN112782460A (en) | 2019-11-04 | 2019-11-04 | Method for calculating effective value of alternating voltage |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911065474.3A CN112782460A (en) | 2019-11-04 | 2019-11-04 | Method for calculating effective value of alternating voltage |
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| CN112782460A true CN112782460A (en) | 2021-05-11 |
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| CN201911065474.3A Pending CN112782460A (en) | 2019-11-04 | 2019-11-04 | Method for calculating effective value of alternating voltage |
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63295971A (en) * | 1987-05-28 | 1988-12-02 | Fuji Electric Co Ltd | Detection of effective value |
| JP2005148028A (en) * | 2003-11-20 | 2005-06-09 | Miwa Electric Co Ltd | Device and method for measuring voltage, current, active power, reactive power, and frequency in power system |
| JP2012193982A (en) * | 2011-03-15 | 2012-10-11 | Kansai Electric Power Co Inc:The | Measuring apparatus and method and analyzing apparatus and method |
| CN103744396A (en) * | 2014-01-08 | 2014-04-23 | 国家电网公司 | Device applied to coordination control over SVG (static var generator) and APF (active power filter) |
| CN204649825U (en) * | 2015-05-21 | 2015-09-16 | 武汉大学 | Based on the high speed true effective value rectifying system of FPGA |
| CN206272236U (en) * | 2016-10-31 | 2017-06-20 | 国网山西省电力公司 | A kind of reactive comprehensive cooperative control device for AVC access type transformer station |
| CN108023354A (en) * | 2016-10-31 | 2018-05-11 | 国网山西省电力公司 | A kind of voltage idle-work fast control method for AVC access type substation |
| US20180166913A1 (en) * | 2016-12-08 | 2018-06-14 | Toshiba International Corporation | Ups power failure detection |
| CN108879714A (en) * | 2018-06-29 | 2018-11-23 | 思源清能电气电子有限公司 | A kind of SVG control device based on environment self-adaption |
-
2019
- 2019-11-04 CN CN201911065474.3A patent/CN112782460A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63295971A (en) * | 1987-05-28 | 1988-12-02 | Fuji Electric Co Ltd | Detection of effective value |
| JP2005148028A (en) * | 2003-11-20 | 2005-06-09 | Miwa Electric Co Ltd | Device and method for measuring voltage, current, active power, reactive power, and frequency in power system |
| JP2012193982A (en) * | 2011-03-15 | 2012-10-11 | Kansai Electric Power Co Inc:The | Measuring apparatus and method and analyzing apparatus and method |
| CN103744396A (en) * | 2014-01-08 | 2014-04-23 | 国家电网公司 | Device applied to coordination control over SVG (static var generator) and APF (active power filter) |
| CN204649825U (en) * | 2015-05-21 | 2015-09-16 | 武汉大学 | Based on the high speed true effective value rectifying system of FPGA |
| CN206272236U (en) * | 2016-10-31 | 2017-06-20 | 国网山西省电力公司 | A kind of reactive comprehensive cooperative control device for AVC access type transformer station |
| CN108023354A (en) * | 2016-10-31 | 2018-05-11 | 国网山西省电力公司 | A kind of voltage idle-work fast control method for AVC access type substation |
| US20180166913A1 (en) * | 2016-12-08 | 2018-06-14 | Toshiba International Corporation | Ups power failure detection |
| CN108879714A (en) * | 2018-06-29 | 2018-11-23 | 思源清能电气电子有限公司 | A kind of SVG control device based on environment self-adaption |
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Application publication date: 20210511 |
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