CN107819466B - Sampling value signal time synchronization detection method based on AC analog-to-digital conversion real-time response - Google Patents
Sampling value signal time synchronization detection method based on AC analog-to-digital conversion real-time response Download PDFInfo
- Publication number
- CN107819466B CN107819466B CN201711095779.XA CN201711095779A CN107819466B CN 107819466 B CN107819466 B CN 107819466B CN 201711095779 A CN201711095779 A CN 201711095779A CN 107819466 B CN107819466 B CN 107819466B
- Authority
- CN
- China
- Prior art keywords
- signal
- time
- alternating current
- analog
- input port
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000005070 sampling Methods 0.000 title claims abstract description 88
- 238000006243 chemical reaction Methods 0.000 title claims abstract description 84
- 238000001514 detection method Methods 0.000 title claims abstract description 26
- 230000004044 response Effects 0.000 title claims abstract description 22
- 238000004891 communication Methods 0.000 claims abstract description 46
- 238000000034 method Methods 0.000 claims abstract description 19
- 238000012544 monitoring process Methods 0.000 claims abstract description 5
- 230000003287 optical effect Effects 0.000 claims description 34
- 238000005259 measurement Methods 0.000 claims description 17
- 230000000630 rising effect Effects 0.000 claims description 12
- 239000013307 optical fiber Substances 0.000 claims description 11
- 230000001360 synchronised effect Effects 0.000 claims description 7
- 238000012360 testing method Methods 0.000 claims description 7
- 238000012937 correction Methods 0.000 claims description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 4
- 230000005540 biological transmission Effects 0.000 abstract description 3
- 238000011161 development Methods 0.000 abstract description 3
- 238000005516 engineering process Methods 0.000 abstract description 2
- 230000006399 behavior Effects 0.000 description 7
- 238000013475 authorization Methods 0.000 description 6
- 239000000835 fiber Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 230000005693 optoelectronics Effects 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 101100066398 Caenorhabditis elegans fib-1 gene Proteins 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 238000013507 mapping Methods 0.000 description 1
- 239000003550 marker Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M1/00—Analogue/digital conversion; Digital/analogue conversion
- H03M1/10—Calibration or testing
- H03M1/1071—Measuring or testing
Abstract
The invention provides a sampling value signal time synchronization detection method based on real-time response of alternating current analog-to-digital conversion, which is a method for detecting the time deviation of the output moment of an alternating current time synchronization sampling value of alternating current signal analog-to-digital conversion equipment according to the real-time response characteristics of an alternating current analog quantity signal and an alternating current sampling value digital signal of a communication physical layer and by combining a time synchronization signal. The detection method of the invention is based on the physical relationship among time synchronization signal input, alternating current signal input, communication physical layer digital signal output and the like, measures and calculates the time deviation of the output moment of the alternating current time synchronization sampling value signal through the alternating current sampling value information carried by the digital signal, and can judge the physical consistency of the alternating current sampling behavior of the alternating current signal analog-to-digital conversion equipment and the time synchronization signal. The invention conforms to the principle of magnitude transmission, has the physical displayable characteristic, is beneficial to the application of the alternating current sampling data sharing technology and the standardized development thereof, is beneficial to the further promotion of the wide-area real-time monitoring and intelligentization capability of the electric power system and promotes the social application of novel alternating current measuring equipment.
Description
Technical Field
The invention relates to a detection method of power equipment, in particular to a sampling value signal time synchronization detection method based on real-time response of alternating current analog-to-digital conversion.
Background
The application is based on a real-time response detection method ZL 201410144300.7 (hereinafter referred to as 'another case authorization') of an alternating current analog-digital conversion device based on a physical layer sampling value, and provides a method for detecting time deviation of an alternating current time synchronization sampling value signal output moment of an alternating current signal analog-digital conversion device.
The power grid regulation and control main station monitors basic data such as alternating voltage quantity, current quantity and the like of wide-area power flow, and most of the basic data are from measurement of a substation (a transformer substation and a power plant) on the operation state of primary equipment. The power system can adopt a wide area and regional time synchronization mode, and the main station and the sub-station can sense the alternating current running states of different primary equipment in the domain on the same time section by a method of consistent signal sampling behaviors of the alternating current measuring equipment in the domain, so that synchronous measurement operation among different alternating current measuring channels is realized.
At present, an intelligent substation (referred to as an intelligent station for short) becomes an important component of a power transmission and transformation link of a power grid, and a large number of alternating current signal analog-to-digital conversion devices (referred to as analog-to-digital devices) such as an analog quantity merging unit and an a/D collector are applied, converted into alternating current sampling information in a real-time alternating current signal sampling manner, and transmitted to digital measurement ied (interactive electronic device) devices (such as a measurement and control device and a synchronous phasor measurement device of a bay level) through data communication to achieve alternating current measurement. The analog-digital equipment is not only a process level IED with an intelligent station alternating current measurement function, but also can be viewed as an alternating current signal conversion interface part of the traditional substation microcomputer alternating current measurement equipment; one of the main functions is to realize the association between the physical communication state of the primary equipment and the physical time parameter. Based on the theory of digital signal processing, a stable analog-digital device should also be stable in the delay time from the sampling of the ac signal to the output of the sampled value. That is, if the analog-to-digital device can use the 1PPM, 1PPS time synchronization signal as the sampling time reference of the sampling ac signal, and perform ac signal sampling at a certain frequency, the ac signal sampling time and its time value of the information can be determined by the output time of the analog-to-digital device ac sampling information. Therefore, the behavior of sampling the alternating current signal by the analog-digital device at the rising edge moment of 1PPS can be called as 'alternating current time synchronous sampling'; the ac sampling information of the time synchronization sampling output by the analog-to-digital device may be referred to as "ac time synchronization sampling value".
Therefore, the analog-digital equipment can be used for realizing the foundation of alternating current signal time synchronous sampling on site, and can be two types of input signals: the first is an alternating current quantity electric signal, which is an alternating current voltage or current signal of a primary device alternating current real-time running state converted by a mutual inductor or a sensor; the second is a time synchronized optical or electrical signal, which may be a 1 PPS-second pulsed signal or IRIG-B encoded signal that is typically sent once per second by an in-station time synchronization apparatus and may define a second time period. The method comprises the steps that alternating current signals of the analog-digital equipment are sampled in a time synchronization manner, the initial rising edge of each received time synchronization signal can be used as a sampling time synchronization reference point (T), and other sampling time points can be distributed at uniform time intervals in a second time period defined by the time synchronization signals; the sampling of T time per second and other time points of a second time domain can be realized by controlling the sampling behavior time of the alternating current signal.
The analog-to-digital device generally processes the instantaneous state data of the alternating current signal obtained through internal a/D sampling conversion each time into a Sampled Value (SV) message information frame (SV frame) of the communication application layer, and converts the SV frame into an optical (or electrical) digital signal (SV signal) of the sampled value of the communication physical layer, and outputs the SV signal from a communication port. SV frames carried by SV signals output by analog-digital equipment mostly contain three types of important data information: firstly, frame number information (Num) expresses the sampling time of an alternating current signal, and the analog-digital equipment generally sets the value of Num of an SV frame (namely, an alternating current time synchronization sampling value) reflecting the alternating current instantaneous state of the alternating current time synchronization sampling time (namely, T time) to be 0; secondly, alternating current instantaneous measurement information (Val) expresses the instantaneous amplitude of the alternating current signal at the sampling moment; delay time information (Dly), which describes the time difference between the ac signal sampling time and the corresponding SV signal output time, is typically set by the analog-to-digital device to a value of Dly at a known constant (i.e., Dly ═ C, which is typically less than 2 ms).
The inventor of the invention researches and discovers that: the SV frame information sent by the communication port of the analog-digital equipment describes the signal response between the AC signal sampling and the SV signal, reflects the physical relationship among the AC signal, the time synchronization signal, the SV signal and the like of the analog-digital equipment, and is consistent with the signal conversion response characteristic of the analog-digital equipment described by the SV frame information. The SV signal carrying the ac time synchronization sample value may be referred to as an "ac time synchronization sample value signal"; in addition, because the SV signal completely output in real time can reflect the transient state of the described source end and can be effectively applied, the SV signal output end time is defaulted to the output time in the application.
Based on 'another scheme authorization', the method comprises the step of detecting the correctness of a delay time value Dly of an SV frame through signal conversion response physical mapping from an analog input port to a communication output port of analog-to-digital equipment for capturing SV signal display in real time. If the ac sampling conversion delay characteristic of the analog-to-digital device described by the Dly information is correct and the characteristic is not changed due to whether the analog-to-digital device is in the time synchronization operating mode, the relative time difference from the ac sampling behavior at the sampling time point described by Num to the output of the corresponding SV signal in the time synchronization operating mode of the analog-to-digital device should also be consistent with the information carried by Dly.
In addition, based on 'another case authorization', a corrected measurement value delta t of analog-to-digital conversion delay time of analog-to-digital equipment for converting an alternating current signal into an SV optical signal through sampling and converting the SV optical signal into an SV electric signal through an electro-optical signal (LE) can be obtainedAD. The analog-digital equipment can set the value of Dly of the output SV frame as delta tAD(i.e., C ═ Δ t)AD) And the time synchronization signal introduced through the photoelectric conversion device EL is adopted, and by making the device operate in the time synchronization mode, the ac time synchronization sampling can be realized for the ac signal.
Therefore, the output time (T0) of the SV signal which is output by the analog-to-digital equipment and carries the SV frame with Num of 0 can be captured through the LE electric signal port, and the time difference delta T between the T0 and the time T of the second is measured; if the signal conversion delay time generated by LE and EL in the Δ T process is ignored, the ac time synchronization sampling value signal output time deviation Δ T of the analog-to-digital equipment may be about the difference between Δ T and C (i.e., Δ T ≈ Δ T-C ═ T0-T- Δ T)AD). Because the LE and the EL may be photoelectric conversion devices with different signal types and conversion principles, the overall delay time values of the LE and the EL can be respectively measured by referring to a test method of the overall delay time values between electric signal ports of a certain photoelectric conversion device in 'another case authorization' through electric/optical conversion, optical fiber connection and optical/electrical conversion, and the overall delay time values can be used as uncertainty references for delta t measurement and calculation.
The delta t obtained by the invention is based on the analog-to-digital conversion delay characteristic of the analog-to-digital equipment authorized by another scheme, and the time synchronization signal is accessed by the analog-to-digital equipment and is taken as a detection parameter, so that the method can be used for judging the correctness of the alternating current time synchronization sampling behavior of the analog-to-digital equipment; compared with the prior test equipment access time synchronization signal, the test method has stronger physical developability and traceability by the CPU capturing the communication application layer SV frame, the internal timer marking the capturing time and estimating the SV signal time.
Disclosure of Invention
The invention provides a method for detecting the correctness of the output time of an alternating current time synchronization sampling value signal of alternating current signal analog-to-digital conversion equipment based on the physical relationship among alternating current signal input, time synchronization signal input, a communication physical layer digital signal, alternating current sampling value information output and the like. The method is based on time synchronization signal parameters and analog-digital conversion real-time response results obtained by an alternating current analog-digital conversion equipment real-time response detection method ZL 201410144300.7 based on physical layer sampling values, adopts a mode that the alternating current analog-digital conversion equipment introduces the time synchronization signals and takes the time synchronization signals as detection parameters, and can be used for judging the physical consistency of alternating current time synchronization sampling behaviors of the alternating current signal analog-digital conversion equipment and the time synchronization signals by measuring and calculating the time difference between the output time of the alternating current time synchronization sampling values and the time of the time synchronization signals.
A sampling value signal time synchronization detection method based on AC analog-to-digital conversion real-time response is used for AC analog-to-digital conversion equipment, a standard AC signal source, an oscilloscope, a standard clock source, a network signal analyzer, a first photoelectric converter, a second photoelectric converter, a first optical fiber and a second optical fiber, wherein an AC signal output port of the standard AC signal source is connected to an AC signal input port of the AC analog-to-digital conversion equipment, an optical signal communication output port of the AC analog-to-digital conversion equipment is connected to an optical signal communication input port of the first photoelectric converter through the second optical fiber, an electrical signal communication output port of the first photoelectric converter is connected to an electrical signal communication input port of the network signal analyzer and a second channel input port of the oscilloscope, a marking pulse signal output port of the network signal analyzer is connected to a sixth channel input port of the oscilloscope, a second pulse signal output port of the standard clock source, and a sub-pulse signal output port of the standard clock source is connected to a fifth channel input port of the oscilloscope, an IRIG-B time synchronization electric signal output port of the standard clock source is connected to an IRIG-B time synchronization electric signal input port of the network signal analyzer and an electric signal communication input port of the second photoelectric converter, and an optical signal communication output port of the second photoelectric converter is connected to an IRIG-B time synchronization optical signal input port of the alternating current analog-to-digital conversion equipment through a first optical fiber.
According to the sampling value signal time synchronization detection method based on the AC analog-to-digital conversion real-time response, the time deviation of the output ending moment of the AC time synchronization sampling value signal of the tested AC analog-to-digital conversion equipment is detected through the following steps:
step 101: setting a constant value of Dly of SV frame information carried by an SV signal sent by an optical signal communication output port of the AC analog-to-digital conversion equipment as a correction measurement value' C ═ Deltat (delta t) of analog-to-digital conversion delay time of the known AC analog-to-digital conversion equipment at a man-machine interface of the AC analog-to-digital conversion equipmentAD＝Δt'AD+ΔtLE", starting the AC sampling conversion function of the AC analog-to-digital conversion equipment;
step 102: sending an alternating current signal at an alternating current signal output port of a standard alternating current signal source, and checking that an alternating current sampling conversion state displayed by a human-computer interface of alternating current analog-digital conversion equipment is normal;
step 103: when a man-machine interface of a standard clock source is set, the standard clock source is in a self-defense working mode, and a sub-pulse signal output port, a second pulse signal output port and an IRIG-B time synchronization electric signal output port are started to send time synchronization signals;
step 104: checking a human-computer interface of the alternating current analog-digital conversion equipment, wherein the alternating current sampling time synchronization state displayed by the alternating current analog-digital conversion equipment is normal, and the alternating current sampling conversion state is normal;
step 105: in an oscilloscope, checking that the signal input states of a second channel input port, a fourth channel input port, a fifth channel input port and a sixth channel input port are normal, setting a display recording field and locking the display recording field by the rising edge of a signal MP input by the sixth channel input port;
step 106: setting internal clock in man-machine interface of network signal analyzer, time synchronization with IRIG-B time synchronization electric signal input port, checking that time synchronization working state is normal, starting function of receiving and monitoring electric signal communication input port signal, sampling and checking that C of SV frame of SV signal input from electric signal communication input port is "C ═ Deltat-AD", if the SV signal with the Num information value of 0 of the SV frame is received at the input port of the electric signal communication, the setting is thatSending a marking pulse signal by a marking pulse signal output port, setting an internal clock to start capturing SVn when a certain minute time value and a certain second time value are reached, and setting the SVn as an automatic starting mode when the SVn reaches the time-out value;
step 201: the internal clock of the network signal analyzer reaches a set time value at a certain minute and a set time value at a certain second;
step 202: when the network signal analyzer analyzes the SV frame with the 'N ═ 0', the marking pulse signal output port sends MP to the sixth channel input port of the oscilloscope and locks the display recording field of the oscilloscope;
step 203: man-machine interface of network signal analyzer, locking display "N equals 0" and "C equals delta tAD", and lock-in to show that 53a calculated by the network signal analyzer lags behind the test reference time difference at the end of the SVn signal and δ t will be approximately equal to the port signal response time difference measurement of the known network signal analyzer;
step 204: in the display recording field of the oscilloscope, the MP signal received by the input port of the sixth channel can identify 53a signal jump moment in the display recording field, the rising edge of the pulse per second signal received by the input port of the fourth channel and leading the sampling time synchronization reference point of T1 can be identified by T1, and the signal jump moment of 44a in the display recording field can be identified by T1 and' delta T ≈ delta TRN"the SV signal directed from 53a and received at the input port of the second channel is recognized," N ═ 0 "of Num information signal segment of SV signal directed from 53a is recognized as SVn and the time 52a is recognized and identified;
step 205: from the display recording field of the oscilloscope, the time difference "Δ T ═ T0-T" of the SVn end time T0 lagging behind the sampling time synchronization reference point time T can be measured;
step 206: ' C ═ Deltat displayed by man-machine interface of network signal analyzerAD", the time deviation" Δ T ═ T0-T- Δ T "at the output end time of the ac time synchronization sampling value signal of the ac analog-to-digital conversion device can be measuredEL–Δt'AD–ΔtLE≈ΔT–ΔtAD”。
The detection method is the technical development for detecting the alternating current analog-digital conversion equipment based on the invention patent 'alternating current analog-digital conversion equipment real-time response detection method ZL 201410144300.7 based on a physical layer sampling value', and is deepened and perfected based on the detection method for testing the CPU time synchronization of the equipment, capturing the alternating current sampling value message of a communication application layer and judging the time synchronization characteristic of a sampling behavior at present. The method has physical displayable characteristics, meets the principle requirement of magnitude transmission, is beneficial to the application of the alternating current sampling data sharing technology and the standardized development thereof, is beneficial to the further promotion of wide-area real-time monitoring and intelligent capability, and promotes the social application of novel alternating current measuring equipment.
Drawings
FIG. 1 is a schematic diagram of the connection of the apparatus used in the method for detecting the time synchronization of sampled value signals based on the real-time response of AC/D conversion according to the present invention;
FIG. 2 is a schematic diagram of the setup and detection preparation steps of the loop device in the sampling value signal time synchronization detection method based on the real-time response of the AC analog-to-digital conversion according to the present invention;
FIG. 3 is a timing diagram of the waveforms of the present invention;
fig. 4 is a schematic diagram of the detection steps of the sampling value signal time synchronization detection method based on the real-time response of the ac analog-to-digital conversion according to the present invention.
In the figure: 1-an ac analog-to-digital conversion device (AD), 2-a standard ac signal source (SACS), 3-an Oscilloscope (OSC), 4-a Standard Clock Source (SCS), 5-a Network Signal Analyzer (NSA), 6-a first opto-electronic converter (LE), 7-a second opto-electronic converter (EL), 8-a first optical fiber (FIB1), 9-a second optical fiber (FIB2), 11-an ac signal input port (AI) of the AD, 12-an optical signal communication output port (LTX) of the AD, 13-an IRIG-B time-synchronized optical signal input port (CLK) of the AD, 15-an man-machine interface (HMI) of the AD, 21-an ac signal output port (AO) of the SACS, 32-a second channel input port (CH2) of the OSC, 34-a fourth channel input port (CH4) of the OSC, 35-a fifth channel input port (CH5) of the OSC, 36-a sixth channel input port (CH6) of the OSC, 41-a satellite signal input port (ANT) of the SCS, 42-IRIG-B time-synchronized electrical signal output port (SYN) of SCS, 43-sub-pulse signal output port (PPM) of SCS, 44-second pulse signal output port (PPS) of SCS, rising edge of second pulse signal of sampling time-synchronized reference point output by PPS of 44 a-SCS, 45-Human Machine Interface (HMI) of SCS, electrical signal communication input port (RXN) of 52-NSA, 52 a-NSA specifying ending time of SV signal received by RXN, 53-NSA marking pulse signal output Port (PRXN) of SV signal received by RXN, 53 a-PRXN marking rising edge of marking pulse of 52a of SV signal received by NSA specifying RXN, IRIG-B time-synchronized electrical signal input port (TIM) of 54-NSA, Human Machine Interface (HMI) of 55-NSA, optical signal communication input port (RXL) of 61-LE, electrical signal communication output port (TXE) of 62-LE, 62 a-NSA sending an NSA specifying ending time of SV signal received, electrical signal communication input ports (RXE) of 73-EL, optical signal communication output ports (TXL) of 74-EL;
1 PPM-PPM outputs a pulse signal once per minute and the rising edge time is consistent with the time expressed by SCS whole minute display time jump, 1 PPS-PPS outputs a pulse signal once per second and the rising edge time is consistent with the time expressed by SCS whole minute display time jump, MM-represents a certain minute time value displayed by SCS and NSA, SS-represents a certain second time value displayed by SCS and NSA, 00-represents a second time value displayed by SCS and NSA at a certain whole minute time, SV-SV signal waveform segment, a signal segment carrying Num information in N-SV, N-represents a numerical value of Num carried by SV, C-represents a constant value of Dly carried by SV, X-represents a numerical value of Val carried by SV, SVn-represents that an AC time synchronization sampling value signal is SV with the value of which N is 0, and MP-outputs a mark pulse signal for marking SVn by PRXN;
Δt'AD-expressing the AD conversion delay time, Δ t, from the AI AC signal at a certain time of AD sampling to the LTX outputting the corresponding SV optical signalLE-photoelectric conversion delay time, Δ t, representing SV optical signal input to TXE output as SV electrical signal via RXL of LEELInputting an IRIG-B time synchronization electric signal into TXL through the RXE of the EL to output the IRIG-B time synchronization electric signal as an electro-optical conversion delay time delta t of the IRIG-B time synchronization optical signalADCorrection measurements obtained by the "authorization" method and comprising the analog-to-digital conversion delay time for converting the AD sampled AC signal into an SV optical signal and then into an SV electrical signal by LE photoelectricityCalculated value (Δ t)AD＝Δt'AD+ΔtLE)，ΔtRN-a measurement of the port signal response time difference of NSA from 52a of the SV signal input by RXN to 53a of the marker pulse MP output by PRXN obtained by the "other case authorization" method;
the time 44a of the 1PPS rising edge signal change at the sampling time synchronization reference point identified by the T-OSC time domain, the time 53a of the MP signal change identified by the T1-OSC time domain, and the test reference time difference (delta T ≈ delta T) showing that the internal calculation of delta T-NSA describes that the MP rising edge lags behind the SVn ending timeRN) T0-the time points 62a and 52a of SVn identified in the OSC time domain (T0 ≈ T1- δ T), the time difference between SVn and T measured in the Δ T-OSC time domain (Δ T ═ T0-T), and Δ T-the time deviation of the ac time synchronization sample value signal output end time of AD measured in the OSC time domain (Δ T ═ Δ T- Δ T)EL–Δt'AD–ΔtLE≈ΔT–ΔtAD)；
The main devices in the figure function as follows:
AD, the detected device can convert the AC voltage or current analog input signal into SV optical signal to be output;
SACS, an AC signal standard appliance, which can send analog standard AC voltage or current signals required by AD detection;
the OSC signal waveform display equipment can lock the screen to display and record the information of the required time domain according to the trigger signal;
SCS, a traceable time synchronization signal source appliance, which can send time synchronization signals of 1PPM, 1PPS and IRIG-B codes through synchronizing with a satellite or self-guard;
the NSA is an important auxiliary detection appliance, an internal clock can be synchronized with an externally input time synchronization signal, can simulate to send and monitor a received communication signal, can output MP pointing to the SVn to be captured, can display information carried by the SVn, and can display the delay time from the SVn capturing time to the MP output time;
the LE is used for converting SV optical signals into electric signals, and the optical/electric conversion function of the LE is that RXL is input into TXE for output;
EL, used for converting IRIG-B time synchronization electric signals into optical signals, and the electric/optical conversion function of the EL is that RXE is input into TXL to be output;
FIB1, FIB2, for connection between optical signal communication outputs and input ports.
Detailed Description
The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings.
The method is based on a method for detecting the real-time conversion characteristic of signals between an equipment loop and an equipment port authorized by another case, and provides a method for detecting the AC sampling time synchronization performance of AC analog-to-digital conversion equipment by adopting a mode of replacing a sampling value digital-to-analog converter by a standard clock source and applying 1PPM, 1PPS and IRIG-B time synchronization signals of the standard clock source.
The invention provides an alternating current sampling time synchronization performance detection method based on real-time response of alternating current analog-to-digital conversion equipment, which comprises the following detection steps:
1. connection mode between equipment and ports
Referring to fig. 1, an ac signal output port (AO)21 of the SACS of the standard ac signal source (SACS)2 is connected to an ac signal input port (AI)11 of the ac analog-to-digital conversion device (AD)1, an optical signal communication output port (LTX)12 of the AD is connected to an optical signal communication input port (RXL)61 of the first photoelectric converter (LE)6 via FIB2, an electrical signal communication output port (TXE)62 of the LE is connected to an electrical signal communication input port (RXN)52 of the Network Signal Analyzer (NSA)5 and a second channel input port (CH2)32 of the Oscilloscope (OSC)3, the NSA flag of the NSA designates that a flag pulse signal output Port (PRXN)53 of an SV signal received by the RXN is connected to a sixth channel input port (CH6)36 of the OSC, a second pulse signal output port (PPS)44 of the Standard Clock Source (SCS)4 is connected to a fourth channel input port (CH4)34 of the OSC, a sub pulse signal output port (PPM)43 of the SCS) is connected to a fifth channel input port (, the IRIG-B time-synchronous electrical signal output port (SYN)42 of the SCS is connected to an IRIG-B time-synchronous electrical signal input port (TIM)54 and an electrical signal communication input port (RXE)73 of the EL, and the optical signal communication output port (TXL)74 of the EL is connected to the IRIG-B time-synchronous optical signal input port (CLK)13 of the AD via FIB 1.
2. Equipment setup and test preparation for test loops
With reference to fig. 1, 2 and 3, the steps of setting up the apparatus and preparing the detection circuit are as follows:
step 101: in the HMI setting of AD, C of AD sending SV frame information is a corrected measured value delta t of known analog-to-digital conversion delay timeADStarting AD signal conversion work;
step 102: sending an alternating current signal at AO of SACS, checking HMI of AD to display that the alternating current sampling state is normal;
step 103: setting the HMI of the SCS, wherein the SCS is in a self-defense working mode, and starting PPM, PPS and SYN ports to send time synchronization signals;
step 104: the HMI inspection of AD shows that the time synchronization state of AD is normal and the AC sampling state is normal;
step 105: at OSC, the monitored states of CH2, CH4, CH5 and CH6 are checked to be normal, the input signal is checked to be normal, and the display record field is set and locked when the CH6 signal state is 53 a.
Step 106: setting internal clock and TIM time synchronization on HMI of NSA, starting RXN signal receiving monitoring, sampling and checking that C in SV frame information of SV received by RXN should be delta tADIf RXN receives SVn with N equal to 0 in SV frame information, PRXN sends MP, and when the internal clock reaches a certain time [ MM: SS ]]The start capture SVn is juxtaposed to the time-out auto-start mode.
3. Detection of time deviation Delta t of time-synchronous sampling of AD (analog-to-digital) AC signal
With reference to fig. 1, 3 and 4, the time synchronization deviation between the 1PPM, 1PPS and IRIG-B signals of SCS is 0, and the time deviation Δ t of the ac signal time synchronization sampling of AD can be measured by the following steps:
step 201: NSA internal clock to [ MM: SS ];
step 202: if NSA judges that an SV frame with N equal to 0 is obtained, PRXN sends out MP to CH6 to lock an OSC display record field;
step 203: HMI display of NSA is locked, the value of N, C of SV frame of SVn is locked, and the time difference delta t ≈ delta t of MP lagging SVn is lockedRN；
Step 204: in the OSC locked display record field, MP received by CH6 recognizes 53a and identifies T1, T1 recognizes 44a of 1PPS received by CH4 and leading T1 and identifies T, δ T displayed by T1 and NSA recognizes SV pointed to by 53a and received by CH2, SVn if N is 0, and T0 is identified by recognition 52a, 62 a;
step 205: measuring the time difference delta T between the SVn and 1PPS leading the SVn by the OSC, wherein the time difference delta T is T0-T;
step 206: from the corrected measured value Δ t of the delay time of the known AD conversionADAnd can measure and calculate delta T ≈ delta T-delta TAD。
The above description is only an embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (1)
1. A sampling value signal time synchronization detection method based on AC analog-to-digital conversion real-time response is characterized in that: the method is applied to an alternating current analog-to-digital conversion device (1), a standard alternating current signal source (2), an oscilloscope (3), a standard clock source (4), a network signal analyzer (5), a first photoelectric converter (6), a second photoelectric converter (7), a first optical fiber (8) and a second optical fiber (9), wherein an alternating current signal output port (21) of the standard alternating current signal source (2) is connected to an alternating current signal input port (11) of the alternating current analog-to-digital conversion device (1), an optical signal communication output port (12) of the alternating current analog-to-digital conversion device (1) is connected to an optical signal communication input port (61) of the first photoelectric converter (6) through the second optical fiber (9), an electrical signal communication output port (62) of the first photoelectric converter (6) is connected to an electrical signal communication input port (52) of the network signal analyzer (5) and a second channel input port (32) of the, a marking pulse signal output port (53) of the network signal analyzer (5) is connected to a sixth channel input port (36) of the oscilloscope (3), a second pulse signal output port (44) of the standard clock source (4) is connected to a fourth channel input port (34) of the oscilloscope (3), a sub-pulse signal output port (43) of the standard clock source (4) is connected to a fifth channel input port (35) of the oscilloscope (3), an IRIG-B time synchronization electric signal output port (42) of the standard clock source (4) is connected to an IRIG-B time synchronization electric signal input port (54) of the network signal analyzer (5) and an electric signal communication input port (73) of the second photoelectric converter (7), an optical signal communication output port (74) of the second photoelectric converter (7) is connected to an IRIG-B time synchronization optical signal input port (13) of the alternating current analog-to-digital conversion equipment (1) through a first optical fiber (8); the time deviation delta t of the output ending moment of the alternating current time synchronization sampling value signal of the tested alternating current analog-to-digital conversion equipment is detected through the following steps:
step 101: in a man-machine interface (15) of the AC analog-to-digital conversion equipment (1), a constant value C of Dly of SV frame information carried by an SV signal sent by an optical signal communication output port (12) of the AC analog-to-digital conversion equipment (1) is set to be a correction measurement value 'C ═ delta t' of analog-to-digital conversion delay time of the known AC analog-to-digital conversion equipment (1)AD＝Δt'AD+ΔtLE", starting the AC sampling conversion function of the AC analog-to-digital conversion equipment (1);
step 102: sending an alternating current signal at an alternating current signal output port (21) of a standard alternating current signal source (2), and checking that an alternating current sampling conversion state displayed by a man-machine interface (15) of alternating current analog-to-digital conversion equipment (1) is normal;
step 103: setting a man-machine interface (45) of a standard clock source (4), starting a sub-pulse signal output port (43), a second pulse signal output port (44) and an IRIG-B time synchronization electric signal output port (42) to send time synchronization signals when the standard clock source (4) is in a self-defense working mode;
step 104: checking that the synchronous state of the AC sampling time and the conversion state of the AC sampling displayed by the AC analog-to-digital conversion equipment (1) are normal at a human-computer interface (15) of the AC analog-to-digital conversion equipment (1);
step 105: in an oscilloscope (3), checking that the signal input states of a second channel input port (32), a fourth channel input port (34), a fifth channel input port (35) and a sixth channel input port (36) are normal, setting a display record field and locking the display record field by a rising edge 53a of a signal MP input by the sixth channel input port (36);
step 106: an internal clock is arranged on a man-machine interface (55) of a network signal analyzer (5) to be time-synchronized with an IRIG-B time synchronization electric signal input port (54) and check that the time synchronization working state is normal, a function of receiving and monitoring signals of an electric signal communication input port (52) is started, and the fact that C of SV frames of SV signals input by the electric signal communication input port (52) is C-delta t is sampled and checkedADIf an SV signal SVn with the Num information value N of an SV frame being 0 is received by an electric signal communication input port (52), a marking pulse signal MP is sent out by a marking pulse signal output port (53), and an internal clock is set to start to capture the SVn when a time value MM at a certain minute moment and a time value SS at a certain second moment and is set to be an automatic starting mode when the time comes;
step 201: the internal clock of the network signal analyzer (5) reaches a set certain minute time value MM and a set certain second time value SS;
step 202: when the network signal analyzer (5) analyzes the SV frame with the 'N ═ 0', the marking pulse signal output port (53) sends MP to the sixth channel input port (36) of the oscilloscope (3) and locks the display record field of the oscilloscope (3);
step 203: a man-machine interface (55) of the network signal analyzer (5), locking display ' N-0 ' and ' C-DeltatAD", and lock-in to show that the test reference time difference deltat calculated by the network signal analyzer (5) 53a lags behind the SVn signal end time 52a and deltat will be approximately equal to the port signal response time difference measurement deltat of the known network signal analyzer (5)RN；
Step 204: in the display recording field of the oscilloscope (3), the MP signal received by the sixth channel input port (36) can identify 53a the signal jump time T1 in the display recording field, the rising edge 44a of the pulse-per-second signal 1PPS received by the fourth channel input port (34) and leading the sampling time synchronization reference point of T1 can be identified by T1, and the signal jump time T of 44a in the display recording field can be identified by T1 and' delta T ≈ delta TRN"the SV signal directed at 53a and received at the second channel input port (32) is recognizable," N ═ 0 "of the Num information signal segment N of the SV signal directed at 53a is recognizable as SVn and the time T0 at 52a is recognizable and identified;
step 205: from the display recording field of the oscilloscope (3), it is possible to measure the time difference "Δ T ═ T0-T" between the SVn end time T0 and the sampling time synchronization reference point time T;
step 206: 'C-Delta t' displayed by a man-machine interface (55) of the network signal analyzer (5)AD", the time deviation of the output end time of the AC time synchronization sampling value signal of the AC analog-to-digital conversion device (1)' delta T ═ T0-T-delta T can be measuredEL–Δt'AD–ΔtLE≈ΔT–ΔtAD”。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711095779.XA CN107819466B (en) | 2017-11-09 | 2017-11-09 | Sampling value signal time synchronization detection method based on AC analog-to-digital conversion real-time response |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711095779.XA CN107819466B (en) | 2017-11-09 | 2017-11-09 | Sampling value signal time synchronization detection method based on AC analog-to-digital conversion real-time response |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107819466A CN107819466A (en) | 2018-03-20 |
| CN107819466B true CN107819466B (en) | 2021-01-08 |
Family
ID=61604792
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711095779.XA Active CN107819466B (en) | 2017-11-09 | 2017-11-09 | Sampling value signal time synchronization detection method based on AC analog-to-digital conversion real-time response |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107819466B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108649950B (en) * | 2018-05-16 | 2021-07-23 | 国网湖北省电力有限公司电力科学研究院 | Sampling value signal time domain characteristic detection method based on alternating current analog-to-digital conversion response |
| CN109981242B (en) * | 2019-03-29 | 2021-06-25 | 国网湖北省电力有限公司电力科学研究院 | Time synchronization equipment detection method based on IRIG-B signal time-frequency migration |
| CN111680037B (en) * | 2020-05-14 | 2023-08-08 | 许继集团有限公司 | Dynamic data time scale acquisition method and device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102590619A (en) * | 2012-03-14 | 2012-07-18 | 湖北省电力公司电力试验研究院 | Method for detecting time synchronization capacity of real-time measurement equipment based on timing variable |
| CN103905045A (en) * | 2014-04-11 | 2014-07-02 | 国家电网公司 | Alternating-current analog-digital conversion device real-time response detection method based on physical layer sampled value |
| CN103957069A (en) * | 2014-05-14 | 2014-07-30 | 国家电网公司 | Network timing IED time synchronization detection method based on physical layer time information |
-
2017
- 2017-11-09 CN CN201711095779.XA patent/CN107819466B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102590619A (en) * | 2012-03-14 | 2012-07-18 | 湖北省电力公司电力试验研究院 | Method for detecting time synchronization capacity of real-time measurement equipment based on timing variable |
| CN103905045A (en) * | 2014-04-11 | 2014-07-02 | 国家电网公司 | Alternating-current analog-digital conversion device real-time response detection method based on physical layer sampled value |
| CN103957069A (en) * | 2014-05-14 | 2014-07-30 | 国家电网公司 | Network timing IED time synchronization detection method based on physical layer time information |
Non-Patent Citations (2)
| Title |
|---|
| 基于通信物理层信号的智能终端实时响应检测方法;陈宏;《湖北电力》;20160229;第40卷(第2期);第52-57页 * |
| 电力系统时间同步方案;于跃海等;《电力系统自动化》;20080410;第32卷(第7期);第82-86页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107819466A (en) | 2018-03-20 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104375038B (en) | A kind of expansible closed-loop synchronization distribution power automation terminal detection platform and method | |
| CN102608450B (en) | Testing and verifying system appropriate for intelligent transformer substation and verifying method | |
| CN107819466B (en) | Sampling value signal time synchronization detection method based on AC analog-to-digital conversion real-time response | |
| CN103777104B (en) | Digitalized substation secondary signal transmission system time-delay characteristics test device and method | |
| CN109900994B (en) | Intelligent substation secondary circuit comprehensive performance test system and working method | |
| CN102590619B (en) | Method for detecting time synchronization capacity of real-time measurement equipment based on timing variable | |
| CN101604142B (en) | Method for detecting time information of output signal of satellite synchronous time service device | |
| WO2011002843A2 (en) | Automatic identification of multiple power grids using data synchronization | |
| CN104215838B (en) | Remote nuclear phase method for intelligent substation | |
| CN103439679A (en) | Absolute time delay detection device and method of intelligent substation mutual inductor data collection system | |
| CN103905045B (en) | Alternating-current analog-digital conversion device real-time response detection method based on physical layer sampled value | |
| CN103869187A (en) | Portable tester for time response of merging unit | |
| CN101297202A (en) | Method for generating data group, on-the-spot apparatus and system for collecting electric energy quality of electric power supply system | |
| CN105355021A (en) | ZigBee-based remote wireless meter reading system and performance detection method thereof | |
| CN103812731A (en) | Digitization sampling time delay frequency conversion measuring method and measuring system | |
| CN203799000U (en) | System for testing time tick and clock precision of power quality monitoring terminal | |
| CN101957593B (en) | Time information detection method of output signal of satellite synchronization time service device | |
| CN103616653A (en) | System and method for testing clock synchronization and clock precision of power quality monitor terminal | |
| Beddoes et al. | Loss of mains protection relay performances when subjected to network disturbances/events | |
| CN110988506A (en) | Secondary wireless nuclear phase instrument for intelligent substation | |
| CN106341744B (en) | A kind of system and method for testing synchronous passive optical network synchronizing characteristics | |
| EP3982087A1 (en) | An electricity metering device | |
| CN111323650B (en) | Electric power wireless data synchronous recording device and method | |
| KR101777038B1 (en) | Protection relay device | |
| Moreno-Garcia et al. | Implementation of a smart grid inverter through embedded systems |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |