CN102890193A - Multi-cycle sampling frequency compensation method - Google Patents
Multi-cycle sampling frequency compensation method Download PDFInfo
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- CN102890193A CN102890193A CN2011102071811A CN201110207181A CN102890193A CN 102890193 A CN102890193 A CN 102890193A CN 2011102071811 A CN2011102071811 A CN 2011102071811A CN 201110207181 A CN201110207181 A CN 201110207181A CN 102890193 A CN102890193 A CN 102890193A
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Abstract
The invention provides a multi-cycle sampling frequency compensation method which comprises the following steps: sampling two kinds of frequency aliasing signals so as to acquire discrete data of the aliasing signals, wherein the acquisition time has a special time length related to a power frequency cycle; designing a narrowband digital filter which is used for separating the discrete data of the aliasing signals; and separating the discrete data by the designed narrowband digital filter so as to acquire pilot frequency separation signals. According to the invention, the pilot frequency test can be accurately and stably carried out during separation of a signal frequency domain.
Description
Technical field
The present invention relates to electric system power transmission and transforming equipment technical field of measurement and test, particularly relate to the compensation method of a kind of many cycles sample frequency.
Background technology
Transimpedance between the positive order parameter of ultra-high-tension power transmission line and Zero sequence parameter and circuit and coupling capacitance all are the important systematic parameters of electrical network, are that electric network protection is adjusted, reactive-load compensation, the important evidence of structure optimization.Operating standard (" aerial power transmission line construction and acceptance specification ", " 110 kilovolts and more than send the power transformation capital construction projects to start control of acceptance ", " relay protection and automatic safety device operational management rules " and " DL/T559-94 ", " DL/T584-95 " etc.) regulation; transmission line of electricity is newly-built; after the reconstruction, just can put into operation after must surveying parameter.
The electrical network dense degree is more and more higher, common-tower double-return or multi circuit transmission lines become normality, the tightness degree that is coupled between circuit reaches unprecedented level, the power frequency interference current of electromagnetic coupled induction can reach 100A, the demand that the high reliability electric energy is supplied with more and more is not easy operation so that reduce interference level by having a power failure, in traditional test method, the method that adopts power frequency supply to test can not be eliminated the impact of disturbing test findings, employing departs from the alien frequencies signal measurement line parameter circuit value that power frequency is disturbed (50Hz), separate useful alien frequencies test signal and the method for undesired signal is arisen at the historic moment at frequency domain, the alien frequencies method of testing also is widely used in dielectric loss measurement and large-scale grounding network parameter measurement.
Present existing technology has its limitation.The signal of alien frequencies method of testing is processed key and is that frequency-region signal separates, and accurate discrete testing signal and undesired signal to obtain stable test result, undesired signal the decay of test frequency to reach 40db and more than.Existing method adopts discrete Fourier transformation, gathers one or two power frequency period measured signals, and signal is carried out frequency analysis, separates useful alien frequencies test signal and power frequency interference signals at frequency domain.Because the test signal frequency is very near apart from power frequency (50Hz) frequency in the alien frequencies test, generally get ± 2.5Hz or ± 5Hz, then must cause the signal data sequence non-integer-period sampled to the alien frequencies test signal, supply complete cycle although can adopt several different methods, also will inevitably cause the spectrum leakage of frequency domain, thereby cause systematic error.Only just can reach the requirement of decay 20db under signal to noise ratio (S/N ratio) is 2: 1 condition, this cause experiment power supply system huge, and the test result data Stability and veracity all can not satisfy the measurement requirement under existing interference environment condition.
In a word, need the urgent technical matters that solves of those skilled in the art to be exactly: how can find the compensation method of a kind of novel many cycles sample frequency, can be implemented in the signal frequency domain detachment process, carry out the alien frequencies test of accurate stable ground.
Summary of the invention
Technical matters to be solved by this invention provides the compensation method of a kind of many cycles sample frequency, can be implemented in the signal frequency domain detachment process, carries out the alien frequencies test of accurate stable ground.
In order to address the above problem, the invention discloses the compensation method of a kind of many cycles sample frequency, comprising:
Two kinds of frequency alias signals are sampled, and acquisition time is the special time length relevant with power frequency period, obtains the discrete data of aliasing signal;
The design narrow band digital filter obtains the narrow band digital filter that the discrete data of aliasing signal is separated;
Narrow band digital filter by design separates above-mentioned discrete data, obtains the alien frequencies separation signal.
Preferably, described two groups of test frequencies are respectively test frequency ω
1And test frequency ω
2
Preferably, described test frequency ω
1And test frequency ω
2Satisfy formula (I)
|ω
2-ω
1|＝5π×m (Ⅰ)
Wherein, m is positive integer.
Preferably, described special time length refers to that time span is the power frequency period of 10K;
Wherein, K is from 1 to 10 positive integer.
Preferably, the corresponding Fourier of described narrow band filter is changed to
And
Preferably, described alien frequencies separation signal y (n)
iBe alien frequencies signal y (n)
1And power frequency interference signals y (n)
2
Wherein, i is 1 or 2.
Preferably, the compensation method of described many cycles sample frequency also comprises:
The alien frequencies test signal of compensation aliasing is the information of complete cycle, so that spectrum leakage is zero.
Preferably, the compensation method of described many cycles sample frequency also comprises:
Utilizing narrow band digital filter that information measured is carried out filtering processes the mode adopt and satisfies formula (II)
y(n)
i＝x(n)*h(n)
i (Ⅱ)
Wherein,
Y (n)
iBe the frequency domain separation signal, i is 1 or 2, y (n)
1Be the alien frequencies signal, y (n)
2Be power frequency interference signals;
X (n) is aliasing signal;
H (n)
iBe narrow band filter, i is 1 or 2.
Compared with prior art, the present invention has the following advantages:
The invention provides the compensation method of a kind of many cycles sample frequency, specifically can comprise: two kinds of frequency alias signals are sampled, and acquisition time is the special time length relevant with power frequency period, obtains the discrete data of aliasing signal; The design narrow band digital filter obtains the narrow band digital filter that the discrete data of aliasing signal is separated; Narrow band digital filter by design separates above-mentioned discrete data, obtains the alien frequencies separation signal; Thereby can be implemented in the signal frequency domain detachment process, carry out the alien frequencies test of accurate stable ground.
Description of drawings
Fig. 1 is the process flow diagram of a kind of many cycles sample frequency of the present invention compensation method embodiment 1;
Fig. 2 is the process flow diagram of a kind of many cycles sample frequency of the present invention compensation method embodiment 2;
Fig. 3 is the frequencies omega to be measured in the embodiment of the invention 2
1With frequencies omega
2Aliasing signal x (n) (50Hz), the aliasing ratio is 1: 1 o'clock signal intensity profile synoptic diagram;
Fig. 4 is that the frequency that the aliasing ratio in the embodiment of the invention 2 was separated in 1: 1 o'clock is ω
1Signal y
1The signal intensity profile synoptic diagram;
Fig. 5 is that the frequency that the aliasing ratio in the embodiment of the invention 2 was separated in 1: 1 o'clock is ω
2Signal y
2The signal intensity profile synoptic diagram;
Fig. 6 is the process flow diagram of a kind of many cycles sample frequency of the present invention compensation method embodiment 3;
Fig. 7 is the frequencies omega to be measured in the embodiment of the invention 3
1With frequencies omega
2Aliasing signal x (n) (50Hz), the aliasing ratio is 1: 10 o'clock signal intensity profile synoptic diagram;
Fig. 8 is that the frequency that the aliasing ratio in the embodiment of the invention 3 was separated in 1: 10 o'clock is ω
1Signal y
1The signal intensity profile synoptic diagram;
Fig. 9 is that the frequency that the aliasing ratio in the embodiment of the invention 3 was separated in 1: 10 o'clock is ω
2Signal y
2The signal intensity profile synoptic diagram.
Embodiment
For above-mentioned purpose of the present invention, feature and advantage can be become apparent more, the present invention is further detailed explanation below in conjunction with the drawings and specific embodiments.
One of core idea of the present invention is, the compensation method of a kind of many cycles sample frequency is provided, specifically can comprise: two kinds of frequency alias signals are sampled, and acquisition time is the special time length relevant with power frequency period, obtains the discrete data of aliasing signal; The design narrow band digital filter obtains the narrow band digital filter that the discrete data of aliasing signal is separated; Narrow band digital filter by design separates above-mentioned discrete data, obtains the alien frequencies separation signal; Thereby can be implemented in the signal frequency domain detachment process, carry out the alien frequencies test of accurate stable ground.
With reference to Fig. 1, show the process flow diagram of a kind of many cycles sample frequency of the present invention compensation method embodiment 1, specifically can comprise:
Step 101, the signal of two kinds of frequency alias is sampled, acquisition time is the special time length relevant with power frequency period, obtains the discrete data of aliasing signal.
Wherein,
Described two kinds of frequencies are respectively test frequency ω
1And test frequency ω
2
Described test frequency ω
1And test frequency ω
2Satisfy formula (I)
|ω
2-ω
1|＝5π×m (Ⅰ)
M is positive integer.
Described special time length refers to that time span is the power frequency period of 10K;
K is from 1 to 10 positive integer.
Step 102, design narrow band digital filter obtain the narrow band digital filter that the discrete data of aliasing signal is separated.
Wherein,
Described narrow band filter corresponding Fourier be changed to
And
Step 103, the narrow band digital filter by designing separate above-mentioned discrete data, obtain the alien frequencies separation signal.
Wherein,
Described alien frequencies separation signal y (n)
iBe alien frequencies signal y (n)
1And power frequency interference signals y (n)
2
I is 1 or 2.
Described narrow band digital filter by design separates the data of above-mentioned power frequency period.
The alien frequencies test signal of compensation aliasing is complete cycle, so that spectrum leakage is zero.
Utilizing narrow band digital filter that information measured is carried out filtering processes the mode adopt and satisfies formula (II)
y(n)
i＝x(n)*h(n)
i (Ⅱ)
Y (n)
iBe the frequency domain separation signal, i is 1 or 2, y (n)
1Be the alien frequencies signal, y (n)
2Be power frequency interference signals;
X (n) is aliasing signal;
H (n)
iBe narrow band filter, i is 1 or 2.
With reference to Fig. 2, show the process flow diagram of a kind of many cycles sample frequency of the present invention compensation method embodiment 2, specifically can comprise:
Wherein,
Described two kinds of frequencies are respectively test frequency ω
1And test frequency ω
2(50Hz).
Described test frequency ω
1And test frequency ω
2Satisfy formula (I)
|ω
2-ω
1|＝5π×m (Ⅰ)
M is positive integer.
Acquisition time length is 10K power frequency period (K is from 1 to 10 positive integer), and the alien frequencies test signal of compensation aliasing is complete cycle, and making spectrum leakage is zero in theory.
Test frequency ω
1And test frequency ω
2Aliasing signal x (n) (50Hz), the aliasing ratio is 1: 1.
With reference to Fig. 3, show the frequencies omega to be measured in the embodiment of the invention 2
1With frequencies omega
2Aliasing signal x (n) (50Hz), the aliasing ratio is 1: 1 o'clock signal intensity profile synoptic diagram.
From Fig. 3, can find out: when frequencies omega to be measured
1With frequencies omega
2Aliasing signal x (n) (50Hz), the aliasing ratio is 1: 1 o'clock signal strength condition.
With reference to Fig. 4, the frequency that the aliasing ratio in the embodiment of the invention 2 that shows was separated in 1: 1 o'clock is ω
1Signal y
1The signal intensity profile synoptic diagram.
From Fig. 4, can find out: the frequency that the aliasing ratio was separated in 1: 1 o'clock is ω
1Signal y
1The signal intensity profile situation.
With reference to Fig. 5, the frequency that the aliasing ratio in the embodiment of the invention 2 that shows was separated in 1: 1 o'clock is ω
2Signal y
2The signal intensity profile synoptic diagram.
From Fig. 5, can find out: the frequency that the aliasing ratio was separated in 1: 1 o'clock is ω
2Signal y
2The signal intensity profile situation.
With reference to Fig. 6, show the process flow diagram of a kind of many cycles sample frequency of the present invention compensation method embodiment 3, specifically can comprise:
Step 601, by two groups of test frequencies, gather frequencies omega to be measured
1With frequencies omega
2Aliasing signal x (n) (50Hz), the aliasing ratio is 1: 10 o'clock discrete data.
Wherein,
Described two test frequencies are respectively test frequency ω
1And test frequency ω
2(50Hz).
Described test frequency ω
1And test frequency ω
2Satisfy formula (I)
|ω
2-ω
1|＝5π×m (Ⅰ)
M is positive integer.
Acquisition time length is 10K power frequency period (K is from 1 to 10 positive integer), and the alien frequencies test signal of compensation aliasing is complete cycle, and making spectrum leakage is zero in theory.
Test frequency ω
1And test frequency ω
2Aliasing signal x (n) (50Hz), the aliasing ratio is 1: 10.
With reference to Fig. 7, show the frequencies omega to be measured in the embodiment of the invention 3
1With frequencies omega
2Aliasing signal x (n) (50Hz), the aliasing ratio is 1: 10 o'clock signal intensity profile synoptic diagram.
From Fig. 7, can find out: when frequencies omega to be measured
1With frequencies omega
2Aliasing signal x (n) (50Hz), the aliasing ratio is 1: 10 o'clock signal intensity profile situation.
Step 602, design narrow band digital filter obtain frequencies omega to be measured
1With frequencies omega
2Aliasing signal x (n) (50Hz), the aliasing ratio is the narrow band digital filter that 1: 10 o'clock discrete data is separated.
Step 603, the narrow band digital filter by designing separate above-mentioned discrete data, obtain the alien frequencies separation signal.
With reference to Fig. 8, the frequency that the aliasing ratio in the embodiment of the invention 3 that shows was separated in 1: 10 o'clock is ω
1Signal y
1The signal intensity profile synoptic diagram.
From Fig. 8, can find out: the frequency that the aliasing ratio was separated in 1: 10 o'clock is ω
1Signal y
1The signal intensity profile situation.
With reference to Fig. 9, the frequency that the aliasing ratio in the embodiment of the invention 3 that shows was separated in 1: 10 o'clock is ω
2Signal y
2The signal intensity profile synoptic diagram.
From Fig. 9, can find out: the frequency that the aliasing ratio was separated in 1: 10 o'clock is ω
2Signal y
2The signal intensity profile situation.
The invention provides the compensation method of a kind of many cycles sample frequency.Can improve the signal separating power by method provided by the present invention, can under alien frequencies test signal and power frequency interference signals ratio are 1: 10 condition, carry out signal frequency domain and separate; Improve the signal isolation resolution, separable frequency deviation can reach ± 1Hz; Power frequency interference signals more than or equal to 40db, improves the alien frequencies test accuracy in the decay of testing frequency; The raising of signal separating power can reduce volume and the quality of alien frequencies experiment power supply greatly, has improved automaticity.
In a word, the invention provides the compensation method of a kind of many cycles sample frequency, can be implemented in the signal frequency domain detachment process, carry out the alien frequencies test of accurate stable ground.
Each embodiment in this instructions all adopts the mode of going forward one by one to describe, and what each embodiment stressed is and the difference of other embodiment that identical similar part is mutually referring to getting final product between each embodiment.
More than to a kind of many cycles sample frequency provided by the present invention compensation method, be described in detail, used specific case herein principle of the present invention and embodiment are set forth, the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, all will change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.
Claims (8)
1. the compensation method of cycle sample frequency more than a kind is characterized in that, comprising:
Two kinds of frequency alias signals are sampled, and acquisition time is the special time length relevant with power frequency period, obtains the discrete data of aliasing signal;
The design narrow band digital filter obtains the narrow band digital filter that the discrete data of aliasing signal is separated;
Narrow band digital filter by design separates above-mentioned discrete data, obtains the alien frequencies separation signal.
2. method according to claim 1 is characterized in that:
Described two groups of test frequencies are respectively test frequency ω
1And test frequency ω
2
3. ability method according to claim 2 is characterized in that:
Described test frequency ω
1And test frequency ω
2Satisfy formula (I)
|ω
2-ω
1|＝5π×m (Ⅰ)
Wherein, m is positive integer.
4. method according to claim 1 is characterized in that:
Described special time length refers to that time span is the power frequency period of 10K;
Wherein, K is from 1 to 10 positive integer.
5. method according to claim 1 is characterized in that:
Described narrow band filter corresponding Fourier be changed to
And
6. method according to claim 1 is characterized in that:
Described alien frequencies separation signal y (n)
iBe alien frequencies signal y (n)
1And power frequency interference signals y (n)
2
Wherein, i is 1 or 2.
7. many cycles sample frequency as claimed in claim 1 compensation method is characterized in that, also comprises:
The alien frequencies test signal of compensation aliasing is the information of complete cycle, so that spectrum leakage is zero.
8. many cycles sample frequency as claimed in claim 1 compensation method is characterized in that, also comprises:
Utilizing narrow band digital filter that information measured is carried out filtering processes the mode adopt and satisfies formula (II)
y(n)
i＝x(n)*h(n)
i (Ⅱ)
Wherein,
Y (n)
iBe the frequency domain separation signal, i is 1 or 2, y (n)
1Be the alien frequencies signal, y (n)
2Be power frequency interference signals;
X (n) is aliasing signal;
H (n)
iBe narrow band filter, i is 1 or 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110207181.1A CN102890193B (en) | 2011-07-22 | A kind of many cycles sample frequency compensation method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110207181.1A CN102890193B (en) | 2011-07-22 | A kind of many cycles sample frequency compensation method |
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| Publication Number | Publication Date |
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| CN102890193A true CN102890193A (en) | 2013-01-23 |
| CN102890193B CN102890193B (en) | 2016-12-14 |
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Cited By (3)
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| CN103777079A (en) * | 2014-02-07 | 2014-05-07 | 国网上海市电力公司 | Anti-interference parameter integration testing device for ultra-high voltage line |
| CN105973272A (en) * | 2016-07-28 | 2016-09-28 | 深圳市康必达控制技术有限公司 | Method for improving electric energy measuring precision |
| CN106990317A (en) * | 2017-02-23 | 2017-07-28 | 泰州市得力工索具制造有限公司 | The wireless visible wire and detection method detected for split conductor group connection status |
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| CN105973272A (en) * | 2016-07-28 | 2016-09-28 | 深圳市康必达控制技术有限公司 | Method for improving electric energy measuring precision |
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| CN106990317A (en) * | 2017-02-23 | 2017-07-28 | 泰州市得力工索具制造有限公司 | The wireless visible wire and detection method detected for split conductor group connection status |
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