CN110830140A - Distributed wave recording device and data synchronization method thereof - Google Patents
Distributed wave recording device and data synchronization method thereof Download PDFInfo
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- CN110830140A CN110830140A CN201911141993.3A CN201911141993A CN110830140A CN 110830140 A CN110830140 A CN 110830140A CN 201911141993 A CN201911141993 A CN 201911141993A CN 110830140 A CN110830140 A CN 110830140A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/06—Synchronising arrangements
- H04J3/0635—Clock or time synchronisation in a network
- H04J3/0638—Clock or time synchronisation among nodes; Internode synchronisation
- H04J3/0658—Clock or time synchronisation among packet nodes
- H04J3/0661—Clock or time synchronisation among packet nodes using timestamps
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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Abstract
A distributed wave recording device comprises acquisition terminals and a wave recording host, wherein the acquisition terminals are arranged in a transformer substation interval nearby and comprise a voltage/current sensor module, an analog-to-digital conversion module, a sampling pulse generation module, a sampling value message coding module, a sampling value message storage module, a sampling value message sending module and an optical fiber sending interface module; the wave recording host comprises a plurality of optical fiber receiving interface modules, a hardware timestamp calibration module, a synchronous resampling module and a processing module; and the acquisition terminal and the wave recording host are connected through an optical cable to carry out point-to-point communication. The distributed wave recording device adopts a distributed structure, is slightly influenced by spatial position, is convenient to install, adopts optical fibers to replace cables to realize long-distance signal transmission, and reduces interference.
Description
Technical Field
The invention belongs to the field of comprehensive automation of power systems, and relates to a distributed wave recording device and a data synchronization method thereof.
Background
The wave recording device is an important component of the comprehensive automation of the power system, and can well undertake the tasks of monitoring and recording the operation condition of the power system as a black box for recording the transient process of the power system, thereby ensuring the safe and stable operation of the automation equipment of the power system.
In the existing stock transformer substation, some transformer substations are limited by various technical conditions, and are not provided with wave recording devices, so that certain potential safety hazards exist, and technical transformation is urgently needed. However, the existing wave recording devices all adopt a centralized structure, and the interval signals to be accessed need to be connected with the wave recording devices through long cables. On one hand, the method is difficult to construct in some old substations, and on the other hand, when the secondary cable is long, the problems of signal amplitude reduction, waveform distortion, easy interference and the like exist.
Disclosure of Invention
The invention aims to provide a distributed wave recording device and a wave recording method thereof, wherein the distributed wave recording device adopts a distributed structure and consists of a plurality of components, can be installed by fully utilizing idle space, and does not need an independent screen cabinet; the acquisition terminal is installed nearby, so that the length of a secondary cable is reduced, and the influence of electromagnetic interference is reduced; and the optical fiber is adopted to transmit multi-path voltage, current and switching value signals simultaneously, so that the wiring quantity among all components of the device is reduced, and the construction quantity is reduced.
In order to achieve the above object, the present invention provides a distributed wave recording device, which specifically adopts the following technical scheme:
the utility model provides a distributing type oscillograph device comprises a plurality of subassemblies, and it includes acquisition terminal and a record host computer, its characterized in that:
the plurality of acquisition terminals are arranged in a transformer substation interval nearby and comprise a voltage/current sensor module, an analog-to-digital conversion module, a sampling pulse generation module, a sampling value message coding module, a sampling value message storage module, a sampling value message sending module and an optical fiber sending interface module;
the voltage/current sensor module converts the secondary voltage/current output by the power transformer into small voltage which can be processed by the analog-to-digital conversion module and outputs the small voltage to the analog-to-digital conversion module;
the sampling pulse generating module generates a fixed-frequency sampling pulse and outputs the fixed-frequency sampling pulse to the analog-to-digital conversion module and the sampling value message sending module;
the analog-to-digital conversion module latches the small voltage provided by the voltage/current sensor module when the sampling pulse arrives, converts the small voltage into digital quantity and outputs the digital quantity to the sampling value message coding module;
the sampling value message coding module codes the digital quantity to generate a sampling value message and outputs the sampling value message to the sampling value message storage module;
the sampling value message storage module stores the sampling value message;
the sampling value message sending module latches the sampling value message when the sampling pulse arrives, generates a serial data stream and outputs the serial data stream to the optical fiber sending interface module;
the optical fiber transmitting interface module converts the serial data stream into a physical optical signal to be output;
the wave recording host comprises a plurality of optical fiber receiving interface modules, a hardware timestamp calibration module, a synchronous resampling module and a processing module;
the wave recording host receives the physical optical signal output by the optical fiber sending interface module through the optical fiber receiving interface module, converts the physical optical signal into a serial data stream and outputs the serial data stream to the hardware timestamp calibration module;
the hardware timestamp calibration module receives the serial data stream, monitors the initial bit of the sampling value message and calibrates the time of the sampling value message;
the synchronous resampling module resamples the asynchronous sampling value messages from different acquisition terminals to obtain synchronous sampling values;
and the processing module starts and judges the synchronous sampling value and generates a wave recording file.
The invention further adopts the following technical scheme:
the storage area of the sampling value message storage module has four storage depths and comprises a first storage area, a second storage area, a third storage area and a fourth storage area.
The sampling value message storage module is in a first-in first-out queue mode, namely, the sampling value message newly generated by the sampling value message coding module is stored in a first storage area, meanwhile, the sampling value message of the fourth storage area is moved out, and the sampling value messages of other storage areas are stored in an adjacent high storage area.
And the sampling value message sending module latches the sampling value message from the highest storage area of the sampling value message storage module when the sampling pulse arrives, and generates serial data flow to the optical fiber sending interface module.
And the acquisition terminal and the wave recording host are connected through an optical cable to carry out point-to-point communication.
The distributed wave recording device provided by the invention adopts distributed acquisition terminals, the data generated by each acquisition terminal is asynchronous and cannot be directly processed like a conventional wave recording device, so on the basis of the distributed wave recording device provided by the invention, the invention also relates to a data synchronization method based on the distributed wave recording device, which comprises the following contents:
step 1: multiple collecting terminals collect the secondary voltage/current output by the power transformer at N frequency fixed frequency, and the generated original sampling value message is marked as
And sending the data to the wave recording host through fixed time delay; (ii) a
Step 2: the wave recording host receives the sampling value messages of all the acquisition terminals and takes the hardware time stamp as the calibration Sn aAnd according to the hardware time stamp, marking the sampling value of each acquisition terminal as Xna；
And step 3: the wave recording host generates N local sampling point sequences every second at equal intervals, and the hardware time stamp of the local sampling point sequences is marked as S0 a；
And 4, step 4: the wave recording host computer is arranged at each sampling point S0 aThe re-sampling mark of each acquisition terminal is Yn aAnd calculating the sampling value after resampling by the following formula, namely the sampling value is a synchronous sampling value:
In the step 1, the acquisition terminal transmits the sampling value message at intervals of four sampling periods with fixed delay.
In the step 2, when the decimal parts of the hardware timestamp of the sample value message and the hardware timestamp of the local sample point are in the range of [0.0000s,1/N s), a is 0, and in the range of [1/N s,2/N s), a is 1, and so on until a is N-1.
In step 3, the hardware timestamp of one of the N local sampling points is the time of the whole second.
In the step 3, a is 0 when the hardware timestamp of the local sampling point is positive second time, a is 1 when the hardware timestamp of the local sampling point is in the range of [1/N s,2/N s), and so on until a is N-1.
The invention has the following technical effects:
adopt distributed architecture, receive spatial position little, the installation of being convenient for, adopt optic fibre to replace the cable to realize long distance signal transmission, reduce the interference.
Drawings
FIG. 1 is a schematic block diagram of an acquisition terminal;
FIG. 2 is a schematic diagram of a wave recording host;
fig. 3 is a flowchart of a data synchronization method of the distributed wave recording apparatus of the present invention.
Fig. 4 is a timing diagram of sample values.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings.
The distributed wave recording device comprises a plurality of acquisition devices and a wave recording device. The acquisition terminal and the wave recording host are connected through an optical cable to carry out point-to-point communication.
As shown in fig. 1, a plurality of collection terminals are arranged in a transformer substation interval nearby, and each collection terminal includes a voltage/current sensor module, an analog-to-digital conversion module, a sampling pulse generation module, a sampling value message encoding module, a sampling value message storage module, a sampling value message sending module, and an optical fiber sending interface module.
The voltage/current sensor module converts the secondary voltage (rated value 57.735V)/current (rated value 5A) output by the power transformer into a small voltage (rated value 5V) which can be processed by the analog-to-digital conversion module and outputs the small voltage to the analog-to-digital conversion module.
The voltage/current sensor refers to a device or apparatus that can sense a predetermined measured quantity and convert the measured quantity into a usable signal according to a certain rule, and generally comprises a sensing element and a conversion element. The sensor is a detection device which can sense the measured information and convert the sensed information into an electric signal or other required information output according to a certain rule so as to meet the requirements of information transmission, processing, storage, display, recording, control and the like. The method is the first link for realizing automatic detection and automatic control.
Power transformers are devices that scale voltage or current. The transformer functions to convert high voltage or large current into standard low voltage (100V) or standard small current (5A or 10A, both nominal values) in proportion, so as to realize standardization and miniaturization of measuring instruments, protective equipment and automatic control equipment.
The sampling pulse generating module generates fixed-frequency sampling pulses and outputs the fixed-frequency sampling pulses to the analog-to-digital conversion module and the sampling value message sending module. In one embodiment of the invention, the sampling pulse generating module generates 5kHz fixed-frequency sampling pulses, and outputs the sampling pulses to the analog-to-digital conversion module and the sampling value message sending module.
The analog-to-digital conversion module latches the small voltage output by the voltage/current sensor module when the sampling pulse arrives, converts the small voltage into digital quantity and outputs the digital quantity to the sampling value message coding module.
And the sampling value message coding module codes the digital quantity received from the analog-to-digital conversion module to generate a sampling value message and outputs the sampling value message to the sampling value message storage module.
And the sampling value message storage module stores the sampling value message. The storage depth of the sampling value message storage module is 4, and the sampling value message storage module comprises a first storage area, a second storage area, a third storage area and a fourth storage area; a first-in first-out queue mode is adopted, namely, a sampling value message newly generated by a sampling value message coding module is stored into a first storage area, meanwhile, the sampling value message of a fourth storage area is shifted out, and the sampling value message of the original first storage area is stored into a second storage area; storing the sampling value message of the original second storage area into a third storage area; and storing the sampling value message of the original third storage area into a fourth storage area.
When a sampling pulse arrives, the sampling value message sending module latches the sampling value message shifted out from the highest storage area of the sampling value message storage module, generates a serial data stream and outputs the serial data stream to the optical fiber sending interface module; and the optical fiber transmitting interface module converts the serial data stream into a physical optical signal for output.
As shown in fig. 2, the wave recording host includes a plurality of fiber receiving interface modules, a hardware timestamp calibration module, a synchronous resampling module, and a processing module.
The optical fiber receiving interface module receives physical optical signals output by the optical fiber sending interface module from each acquisition terminal, converts the physical optical signals into serial data streams and outputs the serial data streams to the hardware timestamp calibration module;
a hardware timestamp calibration module receives a serial data stream, monitors the initial bit of a sampling value message and calibrates the time of the sampling value message; the synchronous resampling module resamples the asynchronous sampling value messages from different acquisition terminals to obtain synchronous sampling values; and the processing module starts and judges the synchronous sampling value and generates a wave recording file.
Fig. 3 is a flowchart of a data synchronization method of the distributed wave recording apparatus of the present invention, and fig. 4 is a timing chart of sampling values. In the present invention, a data synchronization method of a distributed recording apparatus according to the present invention is described in the following embodiments with reference to fig. 3 and 4.
A data synchronization process based on a distributed wave recording apparatus is shown in fig. 3, and includes the following steps:
the method comprises the steps that firstly, a first acquisition terminal and a second acquisition terminal acquire voltage/current at a fixed frequency of 5kHz to generate an original sampling value message, and the sampling value message is sent to a wave recording host through fixed time delay.
Further, since the storage depth of the sampling value message storage module of the present invention is 4, the sampling value message is sent at an interval of 4 sampling periods (the sampling period is 200us), and the fixed delay time is 800 us.
Further, as shown in FIG. 4The original sampling value message sequence generated by the first acquisition terminal is marked as Z1 0～Z1 4999The original sampling value message sequence generated by the second acquisition terminal is marked as Z2 0～Z2 4999. Namely, the original sampling value message sequence generated by each acquisition terminal is marked as Zn bWherein n is the sampling terminal serial number, and b is the sampling terminal serial number.
Furthermore, because the first collection terminal and the second collection terminal are asynchronous, and the sampling time deviation of the original sampling value with the same sampling sequence number is random, the original sampling value message collected and generated in the step one needs to be synchronized.
Step two, the wave recording host receives the original sampling value messages of the first acquisition terminal and the second acquisition terminal and marks the hardware timestamp S of the original sampling value messagesn aAnd re-marking the received original sampling value message as X according to the hardware time stampn a. Wherein n is the serial number of the sampling terminal, and a is the sampling serial number of the wave recording host.
Namely, the hardware timestamp of the sampling value message of the first acquisition terminal is marked as S1 0～S1 4999Marking the hardware time stamp of the sampling value message of the second acquisition terminal as S2 0～S2 4999. And according to the hardware timestamp, the original sampling value message sequence of the first acquisition terminal is marked as X again1 0～X1 4999Re-marking the original sampling value message sequence of the second acquisition terminal as X2 0～X2 4999。
Further, as shown in fig. 4, when the fractional part of the hardware timestamp of the sample value packet is in the range of [0.0000s,0.0002s), the sample sequence number a after the re-marking is 0, when the fractional part of the hardware timestamp of the sample value packet is in the range of [0.0002s,0.0004s), the sample sequence number a after the re-marking is 1, and so on until the sample sequence number a after the re-marking is 4999.
Further, the sampling time deviation of the re-marked sampling value messages with the same sampling sequence number is reduced to be within one sampling period, but the sampling value messages are not synchronized.
Step three, the wave recording host generates 5000 local sampling point sequences per second at equal intervals, and the hardware time stamp of the local sampling point sequences is marked as S0 0～S0 4999Wherein S is0 0At the time of the whole second, S0 1The decimal part of (2) is 0.0002S, and so on to S0 4999The fractional part of (a) is 0.9998 s.
Step four, the wave recording host computer is in S0 0～S0 4999Resampling the first acquisition terminal, and marking the sampling value after resampling as Y1 0～Y1 4999(subscript is sampling serial number), the wave recording host computer is in S0 0～S0 4999Resampling the second acquisition terminal, and marking the sampling value after resampling as Y2 0～Y2 4999(subscript is sample number).
Further, the sampled value after resampling is calculated by the following formula:
furthermore, the sampling time of the sampling value messages with the same sampling sequence number is the same after resampling, so that synchronization is realized.
The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (10)
1. The utility model provides a distributing type oscillograph device comprises a plurality of subassemblies, and it includes acquisition terminal and a record host computer, its characterized in that:
the plurality of acquisition terminals are arranged in a transformer substation interval nearby and comprise a voltage/current sensor module, an analog-to-digital conversion module, a sampling pulse generation module, a sampling value message coding module, a sampling value message storage module, a sampling value message sending module and an optical fiber sending interface module;
the voltage/current sensor module converts the secondary voltage/current output by the power transformer into a small voltage which can be processed by the analog-to-digital conversion module and outputs the small voltage to the analog-to-digital conversion module;
the sampling pulse generating module generates a fixed-frequency sampling pulse and outputs the fixed-frequency sampling pulse to the analog-to-digital conversion module and the sampling value message sending module;
the analog-to-digital conversion module latches the small voltage output by the voltage/current sensor module when the sampling pulse arrives, converts the small voltage into digital quantity and outputs the digital quantity to the sampling value message coding module;
the sampling value message coding module codes the digital quantity to generate a sampling value message and outputs the sampling value message to the sampling value message storage module;
the sampling value message storage module stores the sampling value message;
the sampling value message sending module latches the sampling value message when the sampling pulse arrives, generates a serial data stream and outputs the serial data stream to the optical fiber sending interface module;
the optical fiber transmitting interface module converts the serial data stream into a physical optical signal to be output;
the wave recording host comprises a plurality of optical fiber receiving interface modules, a hardware timestamp calibration module, a synchronous resampling module and a processing module;
the wave recording host receives the physical optical signal output by the optical fiber sending interface module through the optical fiber receiving interface module, converts the physical optical signal into a serial data stream and outputs the serial data stream to the hardware timestamp calibration module;
the hardware timestamp calibration module receives the serial data stream, monitors the initial bit of the sampling value message and calibrates the time of the sampling value message;
the synchronous resampling module resamples the asynchronous sampling value messages from different acquisition terminals to obtain synchronous sampling values;
and the processing module starts and judges the synchronous sampling value and generates a wave recording file.
2. The distributed wave recording apparatus according to claim 1, characterized in that:
the storage area of the sampling value message storage module has four storage depths and comprises a first storage area, a second storage area, a third storage area and a fourth storage area.
3. The distributed wave recording apparatus according to claim 2, characterized in that:
the sampling value message storage module is in a first-in first-out queue mode, namely, the sampling value message newly generated by the sampling value message coding module is stored in a first storage area, meanwhile, the sampling value message in a fourth storage area is shifted out, and the sampling value messages in other storage areas are stored in an adjacent (m + 1) th storage area.
4. The distributed wave recording apparatus according to claim 3, characterized in that:
and the sampling value message sending module latches the sampling value message from the highest storage area of the sampling value message storage module when the sampling pulse arrives, and generates serial data flow to the optical fiber sending interface module.
5. The distributed wave recording apparatus according to claim 1, characterized in that:
and the acquisition terminal and the wave recording host are connected through an optical cable to carry out point-to-point communication.
6. A data synchronization method based on the distributed wave recording device of any one of claims 1 to 5, characterized by comprising the following steps:
step 1: multiple collecting terminals collect the secondary voltage/current output by the power transformer at N frequency fixed frequency, and the generated original sampling value message is marked as Zn bAnd sending the data to the wave recording host machine through fixed time delay; (ii) a
Step 2: the wave recording host receives the sampling value messages of all the acquisition terminals and takes the hardware time stamp as the calibration Sn aAnd according to the hardware time stamp, marking the sampling value of each acquisition terminal as Xna；
And step 3: the wave recording host generates N local sampling point sequences every second at equal intervals, and the hardware time stamp of the local sampling point sequences is marked as S0 a；
And 4, step 4: the wave recording host computer is arranged at each sampling point S0 aThe re-sampling mark of each acquisition terminal is Yn aAnd calculating the sampling value after resampling by the following formula, namely the sampling value is a synchronous sampling value:
in the above steps, N is the serial number of the sampling terminal, a is the sampling serial number of the wave recording host, b is the sampling serial number of the sampling terminal, and b ranges from 0 to N-1.
7. The data synchronization method of the distributed wave recording device according to claim 6, characterized in that:
in the step 1, the acquisition terminal transmits the sampling value message at intervals of four sampling periods with fixed delay.
8. The data synchronization method of the distributed wave recording device according to claim 6, characterized in that:
in the step 2, when the decimal parts of the hardware timestamp of the sample value message and the hardware timestamp of the local sample point are in the range of [0.0000s,1/N s), a is 0, and in the range of [1/N s,2/N s), a is 1, and so on until a is N-1.
9. The data synchronization method of the distributed wave recording device according to claim 6, characterized in that:
in step 3, the hardware timestamp of one of the N local sampling points is the time of the whole second.
10. The data synchronization method of the distributed wave recording device according to claim 6 or 9, characterized in that:
in the step 3, a is 0 when the hardware timestamp of the local sampling point is positive second time, a is 1 when the hardware timestamp of the local sampling point is in the range of [1/N s,2/N s), and so on until a is N-1.
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