CN109714123B - Time synchronization method and system of transient wave recording device of distribution network - Google Patents
Time synchronization method and system of transient wave recording device of distribution network Download PDFInfo
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- CN109714123B CN109714123B CN201811484923.3A CN201811484923A CN109714123B CN 109714123 B CN109714123 B CN 109714123B CN 201811484923 A CN201811484923 A CN 201811484923A CN 109714123 B CN109714123 B CN 109714123B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S40/00—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them
- Y04S40/12—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment
- Y04S40/126—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment using wireless data transmission
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Abstract
The invention relates to the technical field of power systems, and particularly discloses a time synchronization method of a distribution network transient state wave recording device, wherein the distribution network transient state wave recording device comprises a plurality of end points, each end point comprises three acquisition ends and a convergence end, and the time synchronization method of the distribution network transient state wave recording device comprises the following steps: the convergence end of each end point respectively compiles different pseudo-random codes for three acquisition ends of the end point; the convergence end encodes the pseudo-random code of the end point and the time synchronization information and then sends the encoded pseudo-random code and the time synchronization information to the acquisition end of the end point; and each acquisition end of each end point decodes after receiving the time synchronization information carrying the pseudo-random codes, and identifies respective time synchronization information according to different pseudo-random codes. The invention also discloses a time synchronization system of the transient wave recording device of the distribution network. The time synchronization method of the transient wave recording device of the distribution network has the characteristics of less occupied wireless bandwidth, good anti-interference performance, high time synchronization precision and wide action range.
Description
Technical Field
The invention relates to the technical field of power systems, in particular to a time synchronization method of a distribution network transient state wave recording device and a time synchronization system of the distribution network transient state wave recording device.
Background
The fault location of the distribution network needs to carry out multi-point distribution control, three-phase multi-point recording fault signals, comprehensive judgment and fault point location, so that the time of multi-end multi-point is required to be kept consistent, and the time scale between the concentrator and the collector of the end point is kept consistent.
For time synchronization applied to the transient wave recording device of the overhead transmission line of the power distribution network, due to the fact that the electromagnetic radiation environment around the overhead transmission line is complex, certain interference exists in communication between wireless radio frequency devices, each end point of the fault wave recorder of the power distribution network is composed of three acquisition units and a collecting unit, each phase of line is detected by the three acquisition units respectively, and then data are transmitted to the collecting unit. However, the time of each end point of the distribution network fault recorder must have high-precision time synchronization so as to ensure the real-time performance and the effectiveness of the recording data. Therefore, a high-precision time synchronization method needs to be designed in a distribution network environment with complex electromagnetic environment, large signal interference and high transmission delay.
Disclosure of Invention
The invention aims to at least solve one of the technical problems in the prior art, and provides a time synchronization method of a distribution network transient state wave recording device and a time synchronization system of the distribution network transient state wave recording device so as to solve the problems in the prior art.
As a first aspect of the present invention, a time synchronization method for a distribution network transient state wave recording device is provided, where the distribution network transient state wave recording device includes multiple end points, each of which includes three acquisition ends and a convergence end, and the time synchronization method for the distribution network transient state wave recording device includes:
the convergence end of each end point respectively compiles different pseudo-random codes for three acquisition ends of the end point;
the convergence end encodes the pseudo random code and the time synchronization information of the endpoint and then sends the encoded pseudo random code and the time synchronization information to the acquisition end of the endpoint;
and each acquisition end of each end point decodes after receiving the time synchronization information carrying the pseudo-random code, and identifies respective time synchronization information according to different pseudo-random codes.
Preferably, the time synchronization method of the distribution network transient recording device further includes:
the convergence end carries out time marking when sending the time synchronization information carrying the pseudo-random code;
and the aggregation end carries out time marking when receiving the time synchronization information carrying the pseudo-random code.
Preferably, each acquisition end of each endpoint decodes the received time synchronization information carrying the pseudo random code, and identifying the respective time synchronization information according to the different pseudo random codes includes:
the acquisition end performs discrete Fourier calculation to obtain frequency domain data of the acquisition end;
multiplying and analyzing the frequency domain data of the acquisition end and the frequency domain data of the pseudo-random code to obtain analyzed data;
performing inverse Fourier calculation on the analytic data to obtain time domain data of pseudo-random codes;
averaging the time domain data to obtain time synchronization information of the pseudo-random code;
judging whether the time synchronization information of the pseudo random codes is matched or not;
and if the pseudo-random codes are matched, identifying the index number and the peak time of the pseudo-random code.
As a second aspect of the present invention, a time synchronization system for a distribution network transient state wave recording device is provided, where the time synchronization system for a distribution network transient state wave recording device includes: the collecting device is connected with the converging device and comprises three collecting ends, and the converging device comprises a converging end;
the convergence end is used for respectively compiling different pseudo random codes for the three acquisition ends connected with the convergence end, coding the pseudo random codes and time synchronization information and then sending the coded pseudo random codes and time synchronization information to the acquisition end connected with a threshold value;
and the acquisition end is used for decoding the received time synchronization information carrying the pseudo random codes and identifying respective time synchronization information according to different pseudo random codes.
The time synchronization method of the transient wave recording device of the distribution network, provided by the invention, has the advantages that the time is synchronized uniformly by the convergence end, the convergence end can be provided with different pseudo-random codes, the real-time performance is higher, the multi-path effect caused by building and solid reflection can be effectively resisted, the uniqueness of time synchronization information can be effectively ensured, the transmission delay of the time synchronization information is reduced, and meanwhile, the method has the characteristics of less occupied wireless bandwidth, good anti-interference performance, high time synchronization precision and wide action range.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
fig. 1 is a flowchart of a time synchronization method of a distribution network transient state wave recording device provided in the present invention.
Fig. 2 is a schematic structural diagram of a time synchronization system of the distribution network transient state wave recording device provided by the invention.
Fig. 3 is a schematic diagram of time synchronization between the sink end and the phase a acquisition end provided in the present invention.
Fig. 4 is a flowchart of a specific embodiment of a time synchronization method for a distribution network transient state wave recording device provided in the present invention.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
As a first aspect of the present invention, a time synchronization method for a distribution network transient state wave recording device is provided, where the distribution network transient state wave recording device includes multiple end points, each of which includes three acquisition ends and one aggregation end, as shown in fig. 1, the time synchronization method for a distribution network transient state wave recording device includes:
s110, compiling different pseudo-random codes for three acquisition ends of each end point by the convergence end of each end point respectively;
s120, the convergence end encodes the pseudo-random code and the time synchronization information of the end point and then sends the encoded pseudo-random code and the time synchronization information to the acquisition end of the end point;
and S130, each acquisition end of each end point receives the time synchronization information carrying the pseudo random code and then decodes the received time synchronization information, and identifies respective time synchronization information according to different pseudo random codes.
The time synchronization method of the transient wave recording device of the distribution network, provided by the invention, has the advantages that the time is synchronized uniformly by the convergence end, the convergence end can be provided with different pseudo-random codes, the real-time performance is higher, the multi-path effect caused by building and solid reflection can be effectively resisted, the uniqueness of time synchronization information can be effectively ensured, the transmission delay of the time synchronization information is reduced, and meanwhile, the method has the characteristics of less occupied wireless bandwidth, good anti-interference performance, high time synchronization precision and wide action range.
Specifically, the time synchronization method for the distribution network transient state wave recording device further includes:
the convergence end carries out time marking when sending the time synchronization information carrying the pseudo-random code;
and the aggregation end carries out time marking when receiving the time synchronization information carrying the pseudo-random code.
Specifically, decoding each acquisition end of each endpoint after receiving the time synchronization information carrying the pseudo random code, and identifying the respective time synchronization information according to different pseudo random codes includes:
the acquisition end performs discrete Fourier calculation to obtain frequency domain data of the acquisition end;
multiplying and analyzing the frequency domain data of the acquisition end and the frequency domain data of the pseudo-random code to obtain analyzed data;
performing inverse Fourier calculation on the analytic data to obtain time domain data of pseudo-random codes;
averaging the time domain data to obtain time synchronization information of the pseudo-random code;
judging whether the time synchronization information of the pseudo random codes is matched or not;
and if the pseudo-random codes are matched, identifying the index number and the peak time of the pseudo-random code.
The time synchronization method of the distribution network transient state wave recording device provided by the invention is described in detail below with reference to fig. 2 to 4.
When a node sends clock information to its neighbor nodes, many nodes in its broadcast domain can receive the information, and a node can receive clock information of many other neighbor nodes when receiving the clock information. Therefore, in order to further improve the accuracy of time synchronization, the algorithm has the advantages of high convergence rate, less message exchange amount, low energy consumption and high efficiency of time information synchronization.
In the embodiment of the invention, pseudo-random codes are added in front of the time synchronization information to ensure that the three-phase acquisition end receives different time synchronization information. The pseudo-random code ensures effective transmission of time information, has stronger anti-interference on one hand, and ensures quick calibration for removing the time information on the other hand. The convergence end distributes different pseudo-random codes (random (i) to different acquisition ends, wherein i is the number of the three-phase acquisition end, the pseudo-random codes have good cross correlation with each other, and the acquisition ends distinguish corresponding time synchronization information according to the different pseudo-random codes.
In specific implementation, the convergence end compiles different pseudo-random codes for the three acquisition ends, encodes the pseudo-random codes with the time synchronization information, and sends the time synchronization information carrying the pseudo-random codes by the convergence end. The collecting end receives the time synchronization signals sent by the gathering ends from No. 1 to No. 3, decodes the signals, identifies respective time synchronization through different pseudo-random codes, and marks corresponding time by the gathering end and the collecting end.
According to the example of time synchronization between the convergence end and the phase-A acquisition end, the synchronization time from the convergence end to the phase-A acquisition end is ta0, the sending time is ta1, the time for the phase-A acquisition end to receive the synchronization signal is ta2, the time for the time synchronization is ta3, the time for the phase-A acquisition end to return the synchronization time to the convergence end is ta4, the time is corrected by correction, and then the synchronization time is returned to the phase-A acquisition end. Since the pseudo random code improves the transmission efficiency of the time synchronization signal, the transmission delay can be considered as zero. The synchronization time of the phase A acquisition end is as follows:
Ta = ta1+(ta3-ta2)/2，
the same principle can be used for obtaining the time Tb = Tb1+ (Tb3-Tb2)/2 of the B-phase acquisition end,
the same way can be used to obtain the C-phase collection end time Tc = Tc1+ (Tc3-Tc 2)/2.
The encoding and decoding process includes that the acquisition end firstly performs discrete Fourier calculation to obtain corresponding frequency domain data N. Multiplying and analyzing the frequency domain data of the N and the random code random (i) to obtain corresponding analysis O, and then performing inverse dispersion Fourier calculation on the analysis data O to obtain time domain data R of the pseudo-random code. And (3) obtaining whether the time synchronization signals in the time domain data R of the pseudo-random code are matched or not by the method of solving the mean difference of the time domain data R of the pseudo-random code, and identifying the index number i and the time T of the peak value of the random (i) if the time synchronization signals are matched. If no other random code random (i) is selected again for matching, until a match is found.
In order to realize the point-to-point time synchronization capability of multiple devices, the time synchronization method of the transient wave recording device of the distribution network provided by the invention adopts a pseudo-random noise coding mode with excellent self-correlation and cross-correlation characteristics, the code phases are aligned, the wide pulse is restored, the code phases are not aligned, and only noise is obtained. After the pseudo-random codes are utilized, the excellence of the cross correlation of the pseudo-random codes can ensure the good orthogonality of multiple acquisition ends, the code sequences of the multiple acquisition ends are distinguished, different pseudo-random codes are distributed to different convergence ends, the pseudo-random codes have good cross correlation with each other, and the acquisition ends distinguish corresponding convergence ends according to the different pseudo-random codes. Meanwhile, the multiple acquisition end code sequences are distinguished, so that the mutual signals of the time synchronization signals of the convergence end are not interfered, the peak staggering is not needed in time, the total time required by the time synchronization of the acquisition end is reduced, and the real-time performance of the system is not influenced by the wireless transmission distance.
In order to improve the accuracy and reliability of time synchronization, the orthogonality of codes is utilized to enable multi-path signals to be separable, the direct path signals arrive firstly, so that the signal components which arrive firstly are selected, other components are discarded, and the multi-path effect of the wireless radio frequency signals in a room caused by object reflection is solved.
Compared with the prior art, the time synchronization method of the transient wave recording device of the distribution network provided by the invention has the advantages that the transmission efficiency of time synchronization information is obviously improved by adding the pseudo-random code, and the multipath interference of wireless radio frequency communication is effectively avoided.
As a second aspect of the present invention, a time synchronization system for a distribution network transient state wave recording device is provided, where the time synchronization system for a distribution network transient state wave recording device includes: the collecting device is connected with the converging device and comprises three collecting ends, and the converging device comprises a converging end;
the convergence end is used for respectively compiling different pseudo random codes for the three acquisition ends connected with the convergence end, coding the pseudo random codes and time synchronization information and then sending the coded pseudo random codes and time synchronization information to the acquisition end connected with a threshold value;
and the acquisition end is used for decoding the received time synchronization information carrying the pseudo random codes and identifying respective time synchronization information according to different pseudo random codes.
It will be understood that the above embodiments are merely exemplary embodiments taken to illustrate the principles of the present invention, which is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and substance of the invention, and these modifications and improvements are also considered to be within the scope of the invention.
Claims (3)
1. A time synchronization method of a distribution network transient state wave recording device is characterized in that the distribution network transient state wave recording device comprises a plurality of end points, each end point comprises three acquisition ends and a convergence end, and the time synchronization method of the distribution network transient state wave recording device comprises the following steps:
the convergence end of each end point respectively compiles different pseudo-random codes for three acquisition ends of the end point;
the convergence end encodes the pseudo random code and the time synchronization information of the endpoint and then sends the encoded pseudo random code and the time synchronization information to the acquisition end of the endpoint;
each acquisition end of each end point receives the time synchronization information carrying the pseudo-random code and then decodes the time synchronization information, and identifies respective time synchronization information according to different pseudo-random codes;
wherein, each acquisition end of each end point receives the time synchronization information carrying the pseudo random code and then decodes the received time synchronization information, and the identification of the respective time synchronization information according to different pseudo random codes comprises the following steps:
the acquisition end performs discrete Fourier calculation to obtain frequency domain data of the acquisition end;
multiplying and analyzing the frequency domain data of the acquisition end and the frequency domain data of the pseudo-random code to obtain analyzed data;
performing inverse Fourier calculation on the analytic data to obtain time domain data of pseudo-random codes;
averaging the time domain data to obtain time synchronization information of the pseudo-random code;
judging whether the time synchronization information of the pseudo random codes is matched or not;
and if the pseudo-random codes are matched, identifying the index number and the peak time of the pseudo-random code.
2. The method for time synchronization of distribution network transient recording devices of claim 1, wherein the method for time synchronization of distribution network transient recording devices further comprises:
the convergence end carries out time marking when sending the time synchronization information carrying the pseudo-random code;
and the aggregation end carries out time marking when receiving the time synchronization information carrying the pseudo-random code.
3. A time synchronization system of a distribution network transient state wave recording device is characterized by comprising: the collecting device is connected with the converging device and comprises three collecting ends, and the converging device comprises a converging end;
the convergence end is used for respectively compiling different pseudo random codes for the three acquisition ends connected with the convergence end, coding the pseudo random codes and time synchronization information and then sending the coded pseudo random codes and the time synchronization information to the acquisition ends connected with the convergence end;
the acquisition end is used for receiving the time synchronization information carrying the pseudo random codes and then decoding the time synchronization information, and identifying respective time synchronization information according to different pseudo random codes;
wherein, each acquisition end of each end point receives the time synchronization information carrying the pseudo random code and then decodes the received time synchronization information, and the identification of the respective time synchronization information according to different pseudo random codes comprises the following steps:
the acquisition end performs discrete Fourier calculation to obtain frequency domain data of the acquisition end;
multiplying and analyzing the frequency domain data of the acquisition end and the frequency domain data of the pseudo-random code to obtain analyzed data;
performing inverse Fourier calculation on the analytic data to obtain time domain data of pseudo-random codes;
averaging the time domain data to obtain time synchronization information of the pseudo-random code;
judging whether the time synchronization information of the pseudo random codes is matched or not;
and if the pseudo-random codes are matched, identifying the index number and the peak time of the pseudo-random code.
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