CN108152568A - A kind of implementation method of sampling with high precision - Google Patents
A kind of implementation method of sampling with high precision Download PDFInfo
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- CN108152568A CN108152568A CN201611110151.8A CN201611110151A CN108152568A CN 108152568 A CN108152568 A CN 108152568A CN 201611110151 A CN201611110151 A CN 201611110151A CN 108152568 A CN108152568 A CN 108152568A
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- sampled values
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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
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- Emergency Protection Circuit Devices (AREA)
Abstract
The present invention discloses a kind of implementation method of sampling with high precision, includes the following steps：(1) it is sampled using double AD of Different Dynamic range, it is AD1 to define the small sampled value of dynamic range, and the big sampled value of dynamic range is AD2；(2) AD2 sampled values are multiplied by dynamic range coefficients, AD2 sampled values is normalized into AD1, obtain AD2 normalization sampled values；(3) by AD1 sampled values or AD2 sampled values compared with switching definite value, output AD1 sampled values is switched according to comparison result or AD2 normalizes sampled value.Such method of sampling can be ensured that while measurement dynamic range requirement is met, and ensure the sampling precision under low-side signal (0~10% rated value), and then improve the Performance And Reliability of entire voltage direct-current transmission control protection system.
Description
Technical field
The invention belongs to electric power network technique field, more particularly to a kind of implementation method of sampling with high precision.
Background technology
HVDC transmission system is rapidly developed in China in recent years, and direct-current measuring device is as D.C. high voltage transmission
One of key equipment of system provides true and reliable primary current, information of voltage for DC control and protection system.In high straightening
It flows in transmission system, especially flexible direct current power transmission system, DC control and protection system is to the sampling precision of direct-current measuring device
There is higher requirement.
National standard《GB_T 26217-2010 HVDC transmission system DC voltage measuring devices》Middle regulation, for 0.2 grade
DC voltage measuring device is required under 10%~100% rated voltage, and sampling precision is no more than 0.2%；For 0.1 grade of direct current
Pressure measuring device, sampling precision requirement are even more to have reached 0.1%.
National standard《GB_T 26216.1-2010 HVDC transmission system direct current measuring devices part 1s：Electronic type
Direct current measuring devices》Middle regulation requires 10%~110% specified electricity for 0.2 grade of electronic direct-current current measuring device
It flows down, sampling precision is no more than 0.2%；For 0.1 grade of electronic direct-current current measuring device, sampling precision requirement is even more to reach
0.1%, while require measurement range to 6 times of rated current.It is right in technical specification in practical flexible DC power transmission engineering
Sampling precision under 5%~10% rated current also proposed same requirement, measurement range requirement be even more reach 15 times it is specified
Electric current is even higher.
For existing electronic direct-current current measuring device generally using 16 bit AD sample chips, measurement dynamic range is designed as 6
Times.Under low-side signal (0~10% rated value), sampling precision can only achieve 2%~5%, influence high-voltage dc transmission electric control
The precision and performance of protection system.
The measurement dynamic range of measuring device is reduced, the sampling precision of low-side signal (0~10% rated value) can be improved.
But under transient fault state, measuring device may not really reflect a DC current or information of voltage, lead to high pressure
The action behavior of direct-current power transmission control protection system is incorrect.
Invention content
The purpose of the present invention is to provide a kind of implementation method of sampling with high precision, it is ensured that meeting measurement dynamic range
It is required that while, it can ensure the sampling precision under low-side signal (0~10% rated value), and then improve entire high-voltage dc transmission
The Performance And Reliability of system is protected in electric control.
In order to achieve the above objectives, solution of the invention is：
A kind of implementation method of sampling with high precision, includes the following steps：
(1) it is sampled using double AD of Different Dynamic range, it is AD1 to define the small sampled value of dynamic range, and dynamic range is big
Sampled value be AD2；
(2) AD2 sampled values are normalized into AD1, obtains AD2 normalization sampled values；
(3) by AD1 sampled values or AD2 sampled values compared with switching definite value, output AD1 sampled values are switched according to comparison result
Or AD2 normalization sampled values.
In above-mentioned steps (1), the selection principle of AD1 dynamic ranges is：At least meet 1 times of rated value measurement range.
In above-mentioned steps (1), the selection principle of AD2 dynamic ranges is：AD2 dynamic ranges are more than AD1 dynamic ranges, according to
Demand of technical standard chooses measurement range, and maximum measurement dynamic range is no more than 2N-1Times rated value, N are sampling A/D chip AD digits.
The particular content of above-mentioned steps (2) is：AD2 sampled values are multiplied by dynamic range coefficients, obtain AD2 normalization samplings
Value；Wherein, ratio of the dynamic range coefficients for AD2 dynamic ranges and AD1 dynamic ranges.
In above-mentioned steps (3), by AD1 sampled values compared with switching definite value 1, specific comparison criterion is：When AD1 sampled values
Less than switching definite value 1, AD1 sampled values are exported；Conversely, output AD2 normalization sampled values.
The selection principle of above-mentioned switching definite value 1 is：Switch the AD1 sampled values that definite value 1 is more than under rated signal, less than AD1
The maximum sampled value of dynamic range.
In above-mentioned steps (3), by AD2 sampled values compared with switching definite value 2, specific comparison criterion is：When AD2 sampled values
More than switching definite value 2, output AD2 normalization sampled values；Conversely, output AD1 sampled values.
The selection principle of above-mentioned switching definite value 2 is：Switch the AD2 sampled values that definite value 2 is more than under rated signal, less than AD1
The maximum sampled value of dynamic range and the ratio of dynamic range coefficients.
After using the above scheme, the present invention switches output, Ji Nengman by double AD sampled values of two-way Different Dynamic range
Requirement of the sufficient HVDC transmission system protective device to direct-current measuring device dynamic range, and can guarantee that direct-current measuring device is low
Sampling precision under end signal (0~10% rated value) improves the Performance And Reliability of entire HVDC transmission system.
Description of the drawings
Fig. 1 is the logic chart of first embodiment of the invention；
Fig. 2 is the logic chart of second embodiment of the invention.
Specific embodiment
Below with reference to attached drawing, technical scheme of the present invention and advantageous effect are described in detail.
The present invention provides a kind of implementation method of sampling with high precision, includes the following steps：
(1) it is sampled using double AD of Different Dynamic range, for ease of description, defining the small sampled value of dynamic range is
AD1, the big sampled value of dynamic range are AD2；
Wherein, the selection principle of AD1 dynamic ranges is：At least meet 1 times of rated value measurement range, generally choose 2 times of volumes
Definite value measurement range.
The selection principle of AD2 dynamic ranges is：AD2 dynamic ranges are more than AD1 dynamic ranges, are selected according to demand of technical standard
Measurement range is taken, maximum measurement dynamic range is no more than 2N-1Times rated value, N are sampling A/D chip AD digits.
(2) AD2 sampled values are normalized into AD1, obtains AD2 normalization sampled values；
It is by the method that AD2 sampled values normalize to AD1：AD2 sampled values are multiplied by dynamic range coefficients, dynamic range system
Ratio of the number for AD2 dynamic ranges and AD1 dynamic ranges, dynamic range coefficients are more than 1.
(3) by AD1 sampled values or AD2 sampled values compared with switching definite value, output AD1 sampled values are switched according to comparison result
Or AD2 normalization sampled values.
As shown in Figure 1, being the logic chart of first embodiment of the invention, include the following steps：
(1) it is sampled using double AD of Different Dynamic range；
(2) AD2 sampled values normalize to AD1；
(3) AD1 current sample values are less than switching definite value 1, export AD1 sampled values；Conversely, output AD2 normalization sampled values.
Wherein, the selection principle of switching definite value 1 is：Switching definite value 1 is greater than the AD1 sampled values under rated signal, is less than
The maximum sampled value of AD1 dynamic ranges.Switching definite value ensures as possible more than 1 times of rated value, avoids frequency occur during normal operation
Numerous switching output sampled value.
As shown in Fig. 2, being the logic chart of second embodiment of the invention, include the following steps：
(1) it is sampled using double AD of Different Dynamic range；
(2) AD2 sampled values normalize to AD1；
(3) AD2 sampled values are more than switching definite value 2, output AD2 normalization sampled values；Conversely, output AD1 sampled values.
Wherein, the selection principle of switching definite value 2 is：Switching definite value 2 is greater than the AD2 sampled values under rated signal, is less than
The maximum sampled value of AD1 dynamic ranges and the ratio of dynamic range coefficients.Switch definite value as possible to ensure more than 1 times of rated value,
Avoid occurring frequent switching output sampled value during normal operation.
Above example is merely illustrative of the invention's technical idea, it is impossible to protection scope of the present invention is limited with this, it is every
According to technological thought proposed by the present invention, any change done on the basis of technical solution each falls within the scope of the present invention
Within.
Claims (8)
1. a kind of implementation method of sampling with high precision, it is characterised in that include the following steps：
(1) it is sampled using double AD of Different Dynamic range, it is AD1 to define the small sampled value of dynamic range, and dynamic range is big to adopt
Sample value is AD2；
(2) AD2 sampled values are normalized into AD1, obtains AD2 normalization sampled values；
(3) by AD1 sampled values or AD2 sampled values compared with switching definite value, according to comparison result switch output AD1 sampled values or
AD2 normalizes sampled value.
2. a kind of implementation method of sampling with high precision as described in claim 1, it is characterised in that：In the step (1), AD1
The selection principle of dynamic range is：At least meet 1 times of rated value measurement range.
3. a kind of implementation method of sampling with high precision as described in claim 1, it is characterised in that：In the step (1), AD2
The selection principle of dynamic range is：AD2 dynamic ranges are more than AD1 dynamic ranges, and measurement range is chosen according to demand of technical standard,
Maximum measurement dynamic range is no more than 2N-1Times rated value, N are sampling A/D chip AD digits.
4. a kind of implementation method of sampling with high precision as described in claim 1, it is characterised in that：The step (2) it is specific
Content is：AD2 sampled values are multiplied by dynamic range coefficients, obtain AD2 normalization sampled values；Wherein, dynamic range coefficients AD2
The ratio of dynamic range and AD1 dynamic ranges.
5. a kind of implementation method of sampling with high precision as described in claim 1, it is characterised in that：It, will in the step (3)
Compared with switching definite value 1, specific comparison criterion is AD1 sampled values：When AD1 sampled values are less than switching definite value 1, output AD1 is adopted
Sample value；Conversely, output AD2 normalization sampled values.
6. a kind of implementation method of sampling with high precision as claimed in claim 5, it is characterised in that：The choosing of the switching definite value 1
Taking principle is：Switch the AD1 sampled values that definite value 1 is more than under rated signal, less than the maximum sampled value of AD1 dynamic ranges.
7. a kind of implementation method of sampling with high precision as described in claim 1, it is characterised in that：It, will in the step (3)
Compared with switching definite value 2, specific comparison criterion is AD2 sampled values：When AD2 sampled values are more than switching definite value 2, output AD2 returns
One changes sampled value；Conversely, output AD1 sampled values.
8. a kind of implementation method of sampling with high precision as claimed in claim 7, it is characterised in that：The choosing of the switching definite value 2
Taking principle is：Switch the AD2 sampled values that definite value 2 is more than under rated signal, less than maximum sampled value and the dynamic of AD1 dynamic ranges
The ratio of range factor.
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| CN201611110151.8A CN108152568A (en) | 2016-12-06 | 2016-12-06 | A kind of implementation method of sampling with high precision |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005017669A2 (en) * | 2003-07-31 | 2005-02-24 | Pulse-Link, Inc. | Sampling circuit apparatus and method |
| CN102138779A (en) * | 2010-02-03 | 2011-08-03 | 深圳市纽泰克电子有限公司 | Wide dynamic physiological signal acquisition system/device/method and high-precision high-resolution oximeter |
| CN102323498A (en) * | 2011-06-09 | 2012-01-18 | 国网电力科学研究院 | Multi-stage segmented high-precision data sampling method |
| CN103002197A (en) * | 2012-09-27 | 2013-03-27 | 深圳市创维群欣安防科技有限公司 | Method, device and intelligent terminal for processing signal data |
| CN103595411A (en) * | 2013-10-14 | 2014-02-19 | 天津市晶奇微电子有限公司 | Single-ramp ADC digital correlative double-sampling circuit of CMOS imaging sensor |
| CN103605441A (en) * | 2013-11-26 | 2014-02-26 | 厦门雅迅网络股份有限公司 | Touch screen sampling optimization method based on dual circular domain |
-
2016
- 2016-12-06 CN CN201611110151.8A patent/CN108152568A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005017669A2 (en) * | 2003-07-31 | 2005-02-24 | Pulse-Link, Inc. | Sampling circuit apparatus and method |
| CN102138779A (en) * | 2010-02-03 | 2011-08-03 | 深圳市纽泰克电子有限公司 | Wide dynamic physiological signal acquisition system/device/method and high-precision high-resolution oximeter |
| CN102323498A (en) * | 2011-06-09 | 2012-01-18 | 国网电力科学研究院 | Multi-stage segmented high-precision data sampling method |
| CN103002197A (en) * | 2012-09-27 | 2013-03-27 | 深圳市创维群欣安防科技有限公司 | Method, device and intelligent terminal for processing signal data |
| CN103595411A (en) * | 2013-10-14 | 2014-02-19 | 天津市晶奇微电子有限公司 | Single-ramp ADC digital correlative double-sampling circuit of CMOS imaging sensor |
| CN103605441A (en) * | 2013-11-26 | 2014-02-26 | 厦门雅迅网络股份有限公司 | Touch screen sampling optimization method based on dual circular domain |
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Application publication date: 20180612 |