CN111579918A - Sampling synchronous correction method for transient recording type fault indicator - Google Patents
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- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
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Abstract
The invention discloses a sampling synchronous correction method for a transient recording type fault indicator. The acquisition unit independently and continuously starts to sample the voltage and the current according to the sampling crystal oscillator period of the acquisition unit; the collection unit carries out time synchronization to the three acquisition units in the group at regular time; a sampling synchronization process of the acquisition unit; and (5) synchronous precision analysis. The invention discloses a sampling synchronous correction method of a transient recording type fault indicator, which is a waveform synchronous correction method, and can still maintain high-precision waveform synchronous capability under the conditions of poor punctuality crystal oscillator, such as manufacturing reasons and temperature reasons, without interfering the continuous sampling process of an analog-to-digital converter.
Description
Technical Field
The invention relates to the technical field of transient recording type fault indicators. In particular to a method for synchronously recording waves in a short-distance wireless mode.
Background
The national grid is currently advancing the construction of smart grids, where distribution automation is one of its key points. In the field of distribution network automation, the most occurring faults are ground faults, and various ground faults have different characteristics, such as amplitude, frequency and other characteristics of fault signals. The transient recording type fault indicator consists of three acquisition units and a collection unit.
The acquisition unit and the collection unit are communicated in a micro-power wireless mode. The acquisition units independently monitor the current and voltage states of the lines of the respective phases, and timely capture the current and voltage waveforms of the lines when the voltage or current magnitude is disturbed, so as to provide a basis for fault analysis and rapid fault point positioning. The integration unit synthesizes three-phase zero-sequence current as an important index for analyzing the grounding point. And the synchronous precision of the three-phase acquisition unit waveform determines the precision of the zero-sequence current. Therefore, three acquisition units are required to have higher synchronous wave recording precision. Because the three acquisition units independently sample, the acquisition units must be synchronously started at the time of starting recording, and higher synchronous recording precision can be achieved. The high synchronization precision is to be kept, and the crystal oscillator precision and the time synchronization technology are naturally involved.
Disclosure of Invention
In view of this, the present invention provides a sampling synchronization correction method for a transient recording type fault indicator, which is a waveform synchronization correction method, and can maintain high-precision waveform synchronization capability under the condition of poor punctual crystal oscillator (manufacturing reason and temperature reason) without interfering with the continuous sampling process of an analog-to-digital converter.
The invention solves the technical problems by the following technical means:
a sampling synchronous correction method for a transient recording type fault indicator comprises the following steps:
(1) the acquisition unit independently and continuously starts to sample the voltage and the current according to the sampling crystal oscillator period of the acquisition unit;
(2) the collecting unit is used for timing to three collecting units in the group, the collecting unit is used for sending a clock synchronization command to 3 collecting units in the same group through the wireless communication module in a timing synchronization mode, the timing time is T, and after the collecting unit sends the synchronization communication command, the wireless communication modules of the 3 collecting units can simultaneously generate a rising edge;
(3) the sampling synchronization process of the acquisition units is that the acquisition unit A starts a Fosc2 timer at the moment of receiving the SYNCA signal, counts the time until the sampling starting moment, and stops the Fosc2 timer, wherein the recording time is t1A, and the acquisition units B and C and the acquisition unit A respectively record the recording time as t1B and t 1C;
correcting all sampling points between two continuous SYNC signals, wherein the sampling value at the moment n is A (n), the corrected sampling value is A1(n), and then the sampling value at the sampling moment at the moment n is corrected as follows:
A1(n)＝A(n)+(A(n+1)-A(n))*(Tc–t1A)/Tc；
in the same way, the corrected sampling values of the phase B and the phase C are as follows:
B1(n)＝B(n)+(B(n+1)-B(n))*(Tc–t1B)/Tc；
C1(n)＝C(n)+(C(n+1)-C(n))*(Tc–t1C)/Tc；
wherein:
tc is sampling period;
a (n) is an actual sampling value of the acquisition unit A at the time of n, A1(n) is a sampling value of the acquisition unit A after synchronous correction at the time of n, and t1A is a sampling calibration time value obtained after the acquisition unit A is synchronous;
b (n) is an actual sampling value of the acquisition unit B at the time n, B1(n) is a sampling value of the acquisition unit B after synchronous correction at the time n, and t1B is a sampling calibration time value obtained after the acquisition unit B is synchronized;
c (n) is an actual sampling value of the acquisition unit C at the time n, C1(n) is a sampling value of the acquisition unit C after synchronous correction at the time n, and t1C is a sampling calibration time value obtained after synchronization;
(4) synchronous precision analysis, under the condition that synchronous correction is not adopted and sampling is started by an analog-to-digital converter of an acquisition unit without intervention, the time when an aggregation unit sends a synchronous command to the acquisition unit every time is random, namely, three acquisition units can receive SYNC pulses in respective sampling periods, and if the starting and wave recording time of three-phase acquisition units is at the same time after a certain time-setting time, the synchronous time deviation of each phase acquisition unit compared with a standard crystal oscillator at the nth point is n & ltdtA & gt, n & lt dtB & gt and n & lt dtC when sampling is carried out by each phase acquisition unit according to the crystal oscillator of the phase acquisition unit, the synchronous deviation is larger and larger along with the time-setting time on the premise that the sampling time is started without intervention, and the maximum deviation reaches Tc;
under the condition of starting sampling by using synchronous correction without intervening the analog-to-digital converter of the acquisition unit, similarly assuming that after a certain time tick, the start recording time of the three-phase acquisition unit is at the same time, that is, T1A is T1B is T1C is 0, and as time goes on, each phase acquisition unit samples according to its own crystal oscillator, the synchronous time deviation of the nth point compared with the standard crystal oscillator is n dtA, n dtB, n dtC, and the sampling point calibrated in one synchronous period T is equivalent to the sampling point of the more accurate time of n + (Tc-T1A)/Tc, n + (Tc-T1B)/Tc, n + (Tc-T1C)/Tc, that is, the sampling point of the virtual time, so that in the synchronization process of the acquisition unit to be collected each time, T1A, T1B, T1C is obtained again;
as long as the synchronization period T of the sink unit is guaranteed, the following conditions are satisfied:
T<(Tc/dtA)*Tc；
T<(Tc/dtB)*Tc；
T<(Tc/dtC)*Tc；
the three-phase acquisition unit will get a synchronization deviation with no accumulated error in each synchronization period, and the synchronization accuracy is mainly determined by the frequency of the auxiliary crystal oscillator.
The larger the frequency, the more accurate t1A, t1B, t1C are calculated in practice. Good three-phase synchronization accuracy can be obtained, and because the running time of the auxiliary crystal oscillator OSC2 is short, the accuracy requirement of the auxiliary crystal oscillator is not required to be too high, and the influence on the power consumption of the whole system of the acquisition unit is small.
The method for achieving synchronization in the patent is to use an auxiliary crystal oscillator (OSC2) to be matched with a sampling crystal oscillator (OSC1) for calibration. It is also necessary for the sink unit to send a synchronization Signal (SYNC) wirelessly. The acquisition unit is a relatively independent device. The power consumption of the acquisition unit is rather limited because there is no direct connection to other devices or apparatuses. Because the power consumption requirement of the acquisition unit is very strict, the frequency of the sampling crystal oscillator OSC1 cannot be very high, and the frequency of the sampling crystal oscillator is about 4 times of the sampling rate in actual operation. The auxiliary crystal oscillator uses a crystal oscillator with higher frequency, the CPU can be used for starting the auxiliary crystal oscillator for a short time to obtain a smaller sampling interval, and the OSC2 used for a short time has little influence on the power consumption of the whole acquisition unit.
The invention has the beneficial effects that: the waveform synchronization correction method can still maintain high-precision waveform synchronization capability under the condition of poor punctual crystal oscillator (manufacturing reason and temperature reason) without interfering the continuous sampling process of an analog-digital converter.
Drawings
FIG. 1 is a schematic diagram of the sampling performed by the acquisition unit of the present invention.
Fig. 2 is a schematic diagram of a time synchronization of a collection unit to three acquisition units in a group at regular time.
Fig. 3 is a schematic diagram of the acquisition unit a recording time when the Fosc2 timer is started to count to the sampling start time and the Fosc2 timer is stopped when the SYNCA signal is received.
Detailed Description
Referring to fig. 1-3, a sampling synchronization calibration method for a transient recording type fault indicator according to the present embodiment is to use an auxiliary crystal oscillator (OSC2) in cooperation with a sampling crystal oscillator (OSC1) for calibration. It is also necessary for the sink unit to send a synchronization Signal (SYNC) wirelessly. The acquisition unit is a relatively independent device. The power consumption of the acquisition unit is rather limited because there is no direct connection to other devices or apparatuses. Because the power consumption requirement of the acquisition unit is very strict, the frequency of the sampling crystal oscillator OSC1 cannot be very high, and the frequency of the sampling crystal oscillator is about 4 times of the sampling rate in actual operation. The auxiliary crystal oscillator uses a crystal oscillator with higher frequency, the CPU can be used for starting the auxiliary crystal oscillator for a short time to obtain a smaller sampling interval, and the OSC2 used for a short time has little influence on the power consumption of the whole acquisition unit.
The following conventions are convenient for discussion:
sampling frequency-Fc;
sampling period-Tc (standard);
deviation dtA between the sampling period of the acquisition unit A and the standard sampling period;
deviation dtB between sampling period of acquisition unit B and standard sampling period;
deviation dtC of the sampling period of the acquisition unit C from the standard sampling period;
sampling a crystal oscillator frequency-Fosc 1;
sampling a crystal oscillation period-Tosc 1;
auxiliary crystal oscillation frequency-Fosc 2;
auxiliary crystal oscillation period-Tosc 2;
the timing synchronization period of the collecting unit is-T;
the correction method comprises the following working processes:
1. the acquisition unit independently and continuously starts to sample the voltage and the current according to the sampling crystal oscillator period of the acquisition unit;
as shown in particular in figure 1.
2. The collection unit carries out time synchronization to three acquisition units in the group at regular time:
the collecting unit sends a clock synchronization command to 3 collecting units in the same group through a wireless communication module in a timing synchronization way (the timing time is T); after the collecting unit sends a synchronous communication command, the wireless communication modules of the 3 acquisition units can simultaneously generate a (SYNCA, SYNCB, SYNCC) rising edge;
as shown in particular in fig. 2.
3. Sampling synchronization process of the acquisition unit:
the communication synchronization process is specifically discussed for the phase a acquisition unit, and the same applies to phase B and phase C.
1) The acquisition unit A starts a Fosc2 timer at the moment of receiving the SYNCA signal, counts the time to the sampling starting moment, and stops the Fosc2 timer, wherein the recording time is t 1A;
as shown in particular in figure 3.
2) All sampling points between two consecutive SYNC signals are corrected. The sampling value before the moment n is A (n), and the corrected sampling value is A1 (n); the sampling value at the sampling time of the n time is corrected to be
A1(n)＝A(n)+(A(n+1)-A(n))*(Tc–t1A)/Tc；
In the same way, the corrected sampling values of the phase B and the phase C are as follows:
B1(n)＝B(n)+(B(n+1)-B(n))*(Tc–t1B)/Tc；
C1(n)＝C(n)+(C(n+1)-C(n))*(Tc–t1C)/Tc；
wherein:
tc is sampling period;
a (n) is an actual sampling value of the acquisition unit A at the time of n, A1(n) is a sampling value of the acquisition unit A after synchronous correction at the time of n, and t1A is a sampling calibration time value obtained after the acquisition unit A is synchronous;
b (n) is an actual sampling value of the acquisition unit B at the time n, B1(n) is a sampling value of the acquisition unit B after synchronous correction at the time n, and t1B is a sampling calibration time value obtained after the acquisition unit B is synchronized;
c (n) is an actual sampling value of the acquisition unit C at the time n, C1(n) is a sampling value of the acquisition unit C after synchronous correction at the time n, and t1C is a sampling calibration time value obtained after synchronization;
4. and (3) synchronous precision analysis:
1) without applying synchronous correction and without intervening in the sampling initiated by the analog-to-digital converter of the acquisition unit:
the time at which the aggregating unit sends a synchronization command to the collecting unit is random each time. That is, the three acquisition units may receive the SYNC pulse in their respective sampling periods. The starting and wave recording time of the three-phase acquisition unit is assumed to be the same time after a certain time tick. Over time, each phase acquisition unit samples according to its own crystal oscillator, and the synchronization time deviation of the nth point compared with the standard crystal oscillator is n × dtA, n × dtB, n × dtC. The synchronization deviation will become larger and larger over time without intervening the start sampling instant, and the maximum deviation will reach Tc.
2) Under the condition that synchronous correction is adopted and sampling is started by an analog-to-digital converter of the acquisition unit without interference:
similarly, after a certain time tick, the start recording time of the three-phase acquisition unit is the same time (t 1A-t 1B-t 1C-0). Over time, each phase acquisition unit samples according to its own crystal oscillator, and the synchronization time deviation of the nth point compared with the standard crystal oscillator is n × dtA, n × dtB, n × dtC. The sampling points calibrated in one synchronization period T correspond to the sampling points at the more accurate time (virtual time) of n + (Tc-T1A)/Tc, n + (Tc-T1B)/Tc, n + (Tc-T1C)/Tc. Thus, a t1A, t1B and t1C is obtained again during each synchronization of the collecting unit by the collecting unit.
As long as the synchronization period T of the collection unit is ensured, the following conditions are satisfied
T<(Tc/dtA)*Tc；
T<(Tc/dtB)*Tc；
T<(Tc/dtC)*Tc；
The three-phase acquisition unit will get a synchronization deviation with no accumulated error in each synchronization cycle. The synchronization precision is mainly determined by the frequency of the auxiliary crystal oscillator. The larger the frequency is, the more accurate t1A, t1B and t1C are calculated in the actual process, and good three-phase synchronization precision can be obtained. Since the auxiliary crystal oscillator OSC2 has a short operating time, the accuracy requirements of the auxiliary crystal oscillator need not be too high and have a small impact on the power consumption of the entire system of the acquisition unit.
Finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered in the claims of the present invention.
Claims (1)
1. A sampling synchronous correction method for a transient recording type fault indicator is characterized by comprising the following steps:
(1) the acquisition unit independently and continuously starts to sample the voltage and the current according to the sampling crystal oscillator period of the acquisition unit;
(2) the collecting unit is used for timing to three collecting units in the group, the collecting unit is used for sending a clock synchronization command to 3 collecting units in the same group through the wireless communication module in a timing synchronization mode, the timing time is T, and after the collecting unit sends the synchronization communication command, the wireless communication modules of the 3 collecting units can simultaneously generate a rising edge;
(3) the sampling synchronization process of the acquisition units is that the acquisition unit A starts a Fosc2 timer at the moment of receiving the SYNCA signal, counts the time until the sampling starting moment, and stops the Fosc2 timer, wherein the recording time is t1A, and the acquisition units B and C and the acquisition unit A respectively record the recording time as t1B and t 1C;
correcting all sampling points between two continuous SYNC signals, wherein the sampling value at the moment n is A (n), the corrected sampling value is A1(n), and then the sampling value at the sampling moment at the moment n is corrected as follows:
A1(n)＝A(n)+(A(n+1)-A(n))*(Tc–t1A)/Tc；
in the same way, the corrected sampling values of the phase B and the phase C are as follows:
B1(n)＝B(n)+(B(n+1)-B(n))*(Tc–t1B)/Tc；
C1(n)＝C(n)+(C(n+1)-C(n))*(Tc–t1C)/Tc；
wherein:
tc is sampling period;
a (n) is an actual sampling value of the acquisition unit A at the time of n, A1(n) is a sampling value of the acquisition unit A after synchronous correction at the time of n, and t1A is a sampling calibration time value obtained after the acquisition unit A is synchronous;
b (n) is an actual sampling value of the acquisition unit B at the time n, B1(n) is a sampling value of the acquisition unit B after synchronous correction at the time n, and t1B is a sampling calibration time value obtained after the acquisition unit B is synchronized;
c (n) is an actual sampling value of the acquisition unit C at the time n, C1(n) is a sampling value of the acquisition unit C after synchronous correction at the time n, and t1C is a sampling calibration time value obtained after synchronization;
(4) synchronous precision analysis, under the condition that synchronous correction is not adopted and sampling is started by an analog-to-digital converter of an acquisition unit without intervention, the time when an aggregation unit sends a synchronous command to the acquisition unit every time is random, namely, three acquisition units can receive SYNC pulses in respective sampling periods, and if the starting and wave recording time of three-phase acquisition units is at the same time after a certain time-setting time, the synchronous time deviation of each phase acquisition unit compared with a standard crystal oscillator at the nth point is n & ltdtA & gt, n & lt dtB & gt and n & lt dtC when sampling is carried out by each phase acquisition unit according to the crystal oscillator of the phase acquisition unit, the synchronous deviation is larger and larger along with the time-setting time on the premise that the sampling time is started without intervention, and the maximum deviation reaches Tc;
under the condition of starting sampling by using synchronous correction without intervening the analog-to-digital converter of the acquisition unit, similarly assuming that after a certain time tick, the start recording time of the three-phase acquisition unit is at the same time, that is, T1A is T1B is T1C is 0, and as time goes on, each phase acquisition unit samples according to its own crystal oscillator, the synchronous time deviation of the nth point compared with the standard crystal oscillator is n dtA, n dtB, n dtC, and the sampling point calibrated in one synchronous period T is equivalent to the sampling point of the more accurate time of n + (Tc-T1A)/Tc, n + (Tc-T1B)/Tc, n + (Tc-T1C)/Tc, that is, the sampling point of the virtual time, so that in the synchronization process of the acquisition unit to be collected each time, T1A, T1B, T1C is obtained again;
as long as the synchronization period T of the sink unit is guaranteed, the following conditions are satisfied:
T<(Tc/dtA)*Tc；
T<(Tc/dtB)*Tc；
T<(Tc/dtC)*Tc；
the three-phase acquisition unit will get a synchronization deviation with no accumulated error in each synchronization period, and the synchronization accuracy is mainly determined by the frequency of the auxiliary crystal oscillator.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112433178A (en) * | 2020-12-03 | 2021-03-02 | 石家庄科林电气股份有限公司 | Line fault detection method for synchronous synthesis of data among multiple devices |
| CN114594669A (en) * | 2020-12-04 | 2022-06-07 | 青岛鼎信通讯股份有限公司 | A Precise Synchronization Method of Transient Recording Fault Indicator |
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