CN104793077A - Phase error detecting method of analog input combining unit - Google Patents
Phase error detecting method of analog input combining unit Download PDFInfo
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- CN104793077A CN104793077A CN201510170719.4A CN201510170719A CN104793077A CN 104793077 A CN104793077 A CN 104793077A CN 201510170719 A CN201510170719 A CN 201510170719A CN 104793077 A CN104793077 A CN 104793077A
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Abstract
Disclosed is a phase error detecting method of an analog input combining unit. The phase error detecting method adopts a detecting system composed of an analogy power source with zero-passage synchronous PPS (pulse per second) output, a tested analog input combining unit and a computer to detect. By means of PPS outputted synchronously by the power source with the zero-passage synchronous PPS, accurate synchronous relation between the input analog and the output digital quantity of the analog input combining unit is set, phase error detection of the analog input combining unit is realized, and phase error trace can be realized by accurately detecting zero-passage error between the output analogy zero-passage point of the power source and the synchronous output PPS. The phase error detecting method is applicable to verified angular difference trace of the analog input combining unit.
Description
Technical field
The present invention relates to a kind of analog input merge cells phase error detecting method based on band zero passage synchronous PPS output power source, belong to Intelligent substation merging unit detection technique field.
Background technology
At present, by test voltage, current signal, merge cells tester and tested analog input merge cells are accessed to being verified as of analog input merge cells, obtain standard signal and tested signal respectively, tester is sampled to the digital signal that simulating signal and the merge cells of signal source output export simultaneously, adopt fft algorithm to calculate fundamental voltage amplitude and the phasing degree of these two sampled signals, thus obtain phase error and amplitude error.
The problem that this method exists is that phase error is traced to the source difficulty, and because a digital quantity after an analog quantity and conversion no longer possesses real time correlation, the difficult point of tracing to the source is how to determine accuracy of synchronism.
Summary of the invention
The object of the invention is, for prior art, the angular difference that the verification of analog input merge cells exists is traced to the source difficult problem, the invention provides a kind of analog input merge cells phase error detecting method based on band zero passage synchronous PPS output power source.
Technical scheme of the present invention is, the detection system that the present invention adopts the simulated power source exported by the synchronous PPS of band zero passage, tested analog input merge cells and common computer to form detects;
The power source that the synchronous PPS of described band zero passage exports is connected with tested analog input merge cells, for tested analog input merge cells provides measuring-signal and synchronous pps pulse per second signal (PPS); Tested analog input merge cells exports and is connected with computing machine.
The simulated power source that the synchronous PPS of described band zero passage exports synchronous pulse per second (PPS) output time simultaneously output frequency be 50Hz, initial phase 90 ° pure sinusoid voltage and current signal as measuring-signal, the error of the zero-acrross ing moment of synchronous pulse per second (PPS) output time and measuring-signal is less than 1us, can detect the phase error of 0.1 grade and following analog input merge cells.
Described tested analog input merge cells is sampled to the analog voltage current signal of input under synchronous pps pulse per second signal controls, and exports IEC61850 numeral message; Received the IEC61850 numeral message of tested analog input merge cells output by computing machine, carry out packet parsing, FFT calculating is carried out to the digital quantity of each passage in the digital message of frame number 0 ~ N-1, obtains the phase place of each railway digital signal
because the phase place of simulating signal is pi/2 (90 °), phase error is
obtain measured value this time; Follow-on test T second, in statistics T second, the mean value of phase error measured value is as final phase error test result.
The power source that described detection system is exported by band zero passage synchronous PPS synchronous pulse per second (PPS) output time simultaneously output frequency be the pure sinusoid voltage and current signal of 50Hz, initial phase 90 °, the analog voltage current signal of input is sampled with the sampling rate of 4kHz or 12.8kHz under synchronous pps pulse per second signal controls by tested analog input merge cells, realizing stable phase measurement time point---the generation moment of pulse per second (PPS) of simulating signal and digital signal, is exactly initial phase in the absolute phase in whole moment second.
By accurate detection, the described band zero passage synchronous PPS output power source mistake zero error exported between analog quantity zero crossing and synchronism output pulse per second (PPS) realizes phase error and traces to the source.
Compared with prior art, the beneficial effect that the present invention has is that the pulse per second (PPS) of the power source synchronism output utilizing the synchronous PPS of band zero passage to export establishes analog input merge cells input analog amount and exports accurate synchronized relation between digital quantity, realize the phase error detection to analog input merge cells, phase error can be realized by the accurate detection power source mistake zero error exported between analog quantity zero crossing and synchronism output pulse per second (PPS) and trace to the source.
The verification angular difference that the present invention is applicable to analog input merge cells is traced to the source.
Accompanying drawing explanation
Fig. 1 is detection method theory diagram.
Embodiment
In order to more specifically describe the present invention, below in conjunction with the drawings and the specific embodiments, technical scheme of the present invention and relative theory thereof are described in detail.
Angular difference Cleaning Principle:
The phase place of tested merge cells input simulating signal is the function of t continuous time, if frequency analog signal is f, then phase place is φ (t)=2 π ft+ φ
t0; The phase place of tested merge cells output digit signals is discrete sampling cycle T
smultiple, φ (n)=2 π × T can be expressed as
s× n+ φ
n0.
Then phase error is:
Δφ＝φ(n)-φ(t)＝2π(T
s×n-t)+(φ
n0-φ
t0) (3)
In formula, Φ
n0for tested merge cells output digit signals initial phase; Φ
t0for tested merge cells input simulating signal initial phase;
So, can moment of accurate Calculation phase error af be the moment t=t of A/D sampling
n=T
s× n, now Δ φ=φ
n0-φ
t0; In formula, t
nfor n-th sampling time of tested merge cells; t
sfor the tested merge cells discrete sampling cycle.
But, due to an analog input merge cells synchronous sampled signal in a general second, continuous print t cannot be obtained
nvalue, can only obtain the phase error that the moment (whole moment second) occurs in pulse per second (PPS).
In order to make analog quantity phase place stablize constant in whole moment second maintenance, when test is with frequency analog signal f=50Hz, the simulating signal that power source exports in the phase place in k (k is integer) moment second is:
φ(t
kpps)＝2πft
kpps+φ
t0＝2πk+φ
t0(1)
Because k is integer, then φ (t
kpps)=φ
t0, the phase place in simulating signal moment whole second is consistent with the initial phase in t=0 moment.In formula (1), t
kppsfor the simulating signal of power source output is in kth time moment second;
The phase place in digital quantity whole moment second is exported in order to obtain merge cells, must use with the pulse per second (PPS) of analog quantity synchronism output (PPS) as the synchronizing signal of sampling, in order to make there is no method error of measuring in theory to the measurement of digital quantity, sampling must be synchronized sampling, and meet nyquist sampling theorem, namely sample rate f s is greater than signal maximum frequency 2 times.
To sum up, in order to can obtain analog quantity whole moment second stable phase angle value and avoid method error of measuring, condition below must be met:
(1) simulating signal zero crossing and PPS precise synchronization;
(2) f
s=N × f, N>2, f
sfor sampling rate.
Because simulated power source output signal frequency is 50Hz, the sampling rate of tested analog input merge cells is generally 4K or 12.8K, the restriction requirement of eligible (2).As long as the simulating signal that simulated power source exports can with PPS precise synchronization, just can be used for the phase error of detection analog input merge cells.
Carrying out the initial phase of calibration mold analog quantity for the ease of the method by being accurately detected zero-signal, exporting the pure sinusoid signal of 90 degree in the output PPS moment:
u(t)＝A
mcos(2πft+π/2)＝A
msin(100πt) (2)
In formula, A
mfor power source exports sinusoidal signal amplitude.
As long as guarantee that the mistiming of the generation moment of PPS and the zero crossing of simulating signal meets the requirement of tracing to the source of tested analog input merge cells like this, just can be used for detecting the phase error of analog input merge cells.
It is 2 ' that the analog input merge cells phase error of 0.05 grade requires, to convert time delays be 2 '/(360*60 '/20ms)=1.86us.The band zero passage synchronous PPS output power source output signal zero crossing used in Fig. 1 is less than 0.5us with the error of synchronous PPS, be 0.27 times of the corresponding time delay of 0.05 grade of analog input merge cells phase error, meet the analog input merge cells phase error detection requirement of 0.1 grade and following grade completely.
The realization of angular difference detection method:
Fig. 1 is a kind of analog input merge cells phase error detection system exporting simulated power source based on the synchronous PPS of band zero passage, comprises the simulated power source of band zero passage synchronous PPS output, tested analog input merge cells and common computer.
The simulated power source exported with the synchronous PPS of zero passage provides measuring-signal and synchronous pps pulse per second signal (PPS) for tested analog input merge cells, synchronous pulse per second (PPS) output time simultaneously output frequency be 50Hz, initial phase 90 ° pure sinusoid voltage and current signal as measuring-signal; The error of the zero-acrross ing moment of synchronous pulse per second (PPS) output time and measuring-signal is less than 1us, can detect the phase error of 0.1 grade and following analog input merge cells.
Tested analog input merge cells is sampled with the sampling rate of 4kHz or 12.8kHz to the analog voltage current signal of input under synchronous pps pulse per second signal controls, protocol conversion, exports IEC61850 numeral message.
Common computer receives the IEC61850 numeral message that tested analog input merge cells exports, carry out packet parsing, FFT calculating is carried out to the digital quantity of each passage in the digital message of frame number 0 ~ N-1 (N is the sampling rate of tested analog input merge cells), calculates the phase place of each railway digital signal
because the phase place of simulating signal is pi/2 (90 °), angular difference is
obtain measured value this time.
Detection system follow-on test T second, the mean value of statistics T interior angle second aberration measurements is as final phase error test result.
Claims (5)
1. an analog input merge cells phase error detecting method, is characterized in that: the detection system that described method adopts the simulated power source exported by the synchronous PPS of band zero passage, tested analog input merge cells and computing machine to form detects;
The power source that the synchronous PPS of described band zero passage exports is connected with tested analog input merge cells, for tested analog input merge cells provides measuring-signal and synchronous pps pulse per second signal (PPS); Tested analog input merge cells exports and is connected with computing machine.
2. a kind of analog input merge cells phase error detecting method according to claim 1, it is characterized in that, the simulated power source that the synchronous PPS of described band zero passage exports synchronous pulse per second (PPS) output time simultaneously output frequency be 50Hz, initial phase 90 ° pure sinusoid voltage and current signal as measuring-signal, the error of the zero-acrross ing moment of synchronous pulse per second (PPS) output time and measuring-signal is less than 1us, can detect the phase error of 0.1 grade and following analog input merge cells.
3. a kind of analog input merge cells phase error detecting method according to claim 1, it is characterized in that, described tested analog input merge cells is sampled to the analog voltage current signal of input under synchronous pps pulse per second signal controls, and exports IEC61850 numeral message; Received the IEC61850 numeral message of tested analog input merge cells output by computing machine, carry out packet parsing, FFT calculating is carried out to the digital quantity of each passage in the digital message of frame number 0 ~ N-1, obtains the phase place of each railway digital signal
because the phase place of simulating signal is pi/2 (90 °), phase error is
obtain measured value this time; Follow-on test T second, in statistics T second, the mean value of phase error measured value is as final phase error test result.
4. a kind of analog input merge cells phase error detecting method according to claim 1, it is characterized in that, the power source that described detection system is exported by band zero passage synchronous PPS synchronous pulse per second (PPS) output time simultaneously output frequency be 50Hz, the pure sinusoid voltage and current signal of initial phase 90 °, the analog voltage current signal of input is sampled with the sampling rate of 4kHz or 12.8kHz under synchronous pps pulse per second signal controls by tested analog input merge cells, realize stable phase measurement time point---the generation moment of pulse per second (PPS) of simulating signal and digital signal, be exactly initial phase in the absolute phase in whole moment second.
5. a kind of analog input merge cells phase error detecting method according to claim 1, it is characterized in that, realize phase error by the mistake zero error accurately detected between described band zero passage synchronous PPS output power source output analog quantity zero crossing and synchronism output pulse per second (PPS) and trace to the source.
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| CN106443215A (en) * | 2016-10-10 | 2017-02-22 | 国网安徽省电力公司电力科学研究院 | Intelligent transformer station transformer protection merging unit synchronous phase sequence checking test device and method |
| CN107300651A (en) * | 2017-07-24 | 2017-10-27 | 中国电力科学研究院 | A kind of digital quantity input type standard combining unit |
| CN107621607A (en) * | 2017-08-21 | 2018-01-23 | 中山市卓的电子科技有限公司 | Battery performance test method, test terminal, readable storage medium storing program for executing and test system |
| CN108414841A (en) * | 2018-03-09 | 2018-08-17 | 黄建钟 | A kind of pulse per second (PPS) stable measurement device |
| CN110967658A (en) * | 2018-09-29 | 2020-04-07 | 武汉格蓝若智能技术有限公司 | Analog input merging unit calibrator tracing method based on digital differential method |
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