A method for correcting synchronization errors of power transmission terminals in the entire network

Abstract

The present invention discloses a method for correcting the synchronization error of the entire network of a power transmission terminal, comprising the following steps: collecting fault information, uploading fault information, marking the fault information at a master station, comparing the fault information, obtaining the correction error, and correcting the error of the entire network. The technical solution of the present invention solves the problem of inaccurate positioning of the fault position due to a small timing error, eliminates the influence of the random error of the timing module, synchronizes the timing module error of the entire network, and enables workers to accurately locate the location where the fault occurs.

Description

Technical Field

[0001] The present invention relates to the technical field of high-voltage power transmission, and in particular to a method for correcting full-network synchronization errors of power transmission terminals. Background Art

[0002] High-voltage power transmission is currently the main mode of long-distance power transmission. High-voltage transmission lines are widely distributed and cross complex terrain. When a fault occurs, whether the fault location can be accurately located is the key to determining the troubleshooting efficiency. When locating the fault location, it is first necessary to extract the fault information at the time of the fault. However, the timing module of the existing high-voltage transmission line terminal has a certain random error. When performing high-precision ranging, a timing error of 1μm may lead to a positioning error of 300 meters. A small timing error leads to inaccurate positioning of the fault location, reducing the troubleshooting efficiency. Therefore, there is an urgent need for a method to correct the random error of the timing module of the high-voltage transmission line terminal. Summary of the invention

[0003] The main purpose of the present invention is to provide a method for correcting the synchronization error of the entire network of a power transmission terminal, aiming to solve the problem of inaccurate fault location caused by a small timing error at a high-voltage transmission line terminal.

[0004] To achieve the above object, the present invention provides a method for correcting synchronization errors of a power transmission terminal network, comprising the following steps:

[0005] S1: When a fault occurs, the non-connected traveling wave terminal of each transmission line triggers the fault information collection function. The collected fault information includes: recorded waveform, fault time and suspected fault location;

[0006] S2: Upload the fault information to the main station;

[0007] S3: The master station receives the fault information of the non-contact traveling wave terminal of each transmission line, and marks the fault information of the non-contact traveling wave terminal of each transmission line;

[0008] S4: Select the recorded waveforms of the non-connected traveling wave terminals of different transmission lines for comparison to obtain the correction error;

[0009] S5: Output the correction error at the time of the fault and synchronize the correction error at the time of the fault of the entire network.

[0010] Optionally, the contactless traveling wave terminal has a fault recorder.

[0011] Optionally, the fault information also includes: a suspected fault location, and the fault information of the non-contact traveling wave terminal of the transmission line closest to the suspected fault location is selected according to the topological structure of the transmission line for comparison.

[0012] Optionally, the transmission line contactless traveling wave terminal is installed directly below the simulated transmission line.

[0013] Optionally, step S4 includes the following specific steps:

[0014] S401: Selecting and comparing the recorded waveforms of non-contact traveling wave terminals of different transmission lines in pairs;

[0015] S402: Calculate the points t1 and t1' where the amplitude of the recorded waveform of two different transmission line non-contact traveling wave terminals is 10%, and calculate the points t2 and t2' where the amplitude of the recorded waveform of two different transmission line non-contact traveling wave terminals is 90%;

[0016] S403: Calculate the point difference Δt1 of 10% of the amplitude of the recorded waveform of two different transmission line non-contact traveling wave terminals, and calculate the point difference Δt2 of 90% of the amplitude of the recorded waveform of two different transmission line non-contact traveling wave terminals;

[0017] S404: Simulation test without mesh, calculate (Δt1+Δt2) / 2, and obtain the correction error as ΔT=(Δt1+Δt2) / 2.

[0018] Optionally, the transmission line contactless traveling wave terminal is installed on a tower of a real transmission line to obtain the distance between devices.

[0019] Optionally, step S4 includes the following specific steps:

[0020] S401: Selecting and comparing the recorded waveforms of non-contact traveling wave terminals of different transmission lines in pairs;

[0021] S402: Calculate the points t1 and t1' where the amplitude of the recorded waveform of two different transmission line non-contact traveling wave terminals is 10%, and calculate the points t2 and t2' where the amplitude of the recorded waveform of two different transmission line non-contact traveling wave terminals is 90%;

[0022] S403: Calculate the point difference Δt1 of 10% of the amplitude of the recorded waveform of two different transmission line non-contact traveling wave terminals, and calculate the point difference Δt2 of 90% of the amplitude of the recorded waveform of two different transmission line non-contact traveling wave terminals;

[0023] S404: Calculate (Δt1+Δt2) / 2-L / V, and obtain the correction error ΔT=(Δt1+Δt2) / 2-L / V, where L is the distance between the non-connected traveling wave terminals of two different transmission lines, and V is the wave velocity of the traveling wave.

[0024] Optionally, the contactless traveling wave terminal of the transmission line adopts Beidou and / or GPS timing modules for time synchronization.

[0025] Optionally, the recorded waveform collected in step S1 is a closing traveling wave.

[0026] Optionally, the recorded waveform collected in step S1 is an out-of-zone discharge traveling wave.

[0027] In the technical solution of the present invention, by collecting the fault information of the non-contact traveling wave terminal close to the suspected fault location in the high-voltage transmission line, and uploading the fault information to the main station, the main station obtains the correction error by comparing the fault information of the non-contact traveling wave terminal, synchronizes the error of the whole network, and eliminates the influence of the random error of the timing module. It can be understood that the technical solution of the present invention solves the problem of inaccurate positioning of the fault location caused by a small timing error, eliminates the influence of the random error of the timing module, synchronizes the timing module error of the whole network, and enables workers to accurately locate the location where the fault occurs. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0029] Figure 1 A diagram showing the steps of a method for correcting synchronization errors of a power transmission terminal in a whole network according to an embodiment of the present invention;

[0030] Figure 2 In the case of an analog line, an embodiment of the present invention is Figure 1 Specific step diagram of step S4;

[0031] Figure 3 This is an embodiment of the present invention in a real line situation Figure 1 Specific step diagram of step S4 in FIG.

[0032] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings in conjunction with the embodiments. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0035] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in the field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0036] In view of this, the main purpose of the present invention is to propose a method for correcting the synchronization error of the entire network of power transmission terminals, aiming to solve the problem of inaccurate fault location caused by tiny timing errors, eliminate the influence of random errors of the timing module, synchronize the timing module errors of the entire network, and enable workers to accurately find the location of the fault.

[0037] See also Figure 1 In one embodiment of the present invention, a method for correcting synchronization errors of a power transmission terminal network mainly includes the following steps:

[0038] S1: When a fault occurs, the non-connected traveling wave terminal of each transmission line triggers the fault information collection function. The collected fault information includes: recorded waveform and fault time;

[0039] S2: Upload the fault information to the main station;

[0040] S3: The master station receives the fault information of the non-contact traveling wave terminal of each transmission line, and marks the fault information of the non-contact traveling wave terminal of each transmission line;

[0041] S4: Select the recorded waveforms of the non-contact traveling wave terminals of different transmission lines for comparison to obtain the correction error.

[0042] S5: Output the correction error at the time of the fault and synchronize the correction error at the time of the fault of the entire network.

[0043] The technical solution of the present invention collects fault information of non-contact traveling wave terminals that are close to suspected fault locations in high-voltage transmission lines, and uploads the fault information to a main station. The main station obtains a fault time correction error by comparing the fault information of the non-contact traveling wave terminals, synchronizes the fault time error of the entire network, and eliminates the influence of random errors of the timing module.

[0044] It should be noted that in the high-voltage transmission line network mentioned in the present invention, when a fault occurs, the non-contact traveling wave terminal of the transmission line network node near the fault will be triggered to start, collect the waveform file at the moment of the fault, the time point of the fault and the location of the suspected fault, and because the timing module of the non-contact traveling wave terminal has a certain random error, the waveform file collected by the non-contact traveling wave terminal, the time point of the fault and the location of the fault have certain errors. Each non-contact traveling wave terminal near the fault uploads the collected fault information to the main station. After collecting the fault information collected by all non-contact traveling wave terminals near the fault, the main station sorts and marks according to the physical distance or network topological distance between each non-contact traveling wave terminal and the suspected fault location. The fault information with a closer physical distance or network topological distance between the non-contact traveling wave terminal and the suspected fault location has a higher priority for waveform comparison, and then selects the recorded waveforms of the non-contact traveling wave terminals of different transmission lines according to the marking order for comparison, and obtains the correction error, and finally outputs the correction error at the fault time, and synchronizes the fault time error of the entire network.

[0045] See also Figure 1 In one embodiment of the present invention, a method for correcting the synchronization error of the entire network of a power transmission terminal is provided. The contactless traveling wave terminal has a fault recorder, which is highly sensitive to the occurrence of faults. When a fault occurs, it can be triggered and started almost instantly to record the fault information, which can effectively reduce the inaccurate information caused by the startup delay and provide interference-free fault information for the correction of the timing error.

[0046] See also Figure 1 In one embodiment of the present invention, a method for correcting the synchronization error of the entire network of transmission terminals is provided. The fault information of the non-contact traveling wave terminal of the transmission line closest to the suspected fault location is selected for comparison according to the topological structure of the transmission line. That is, in the network topology of the transmission line, those non-contact traveling wave terminals that pass through fewer nodes to reach the suspected fault location are selected. The terminals that pass through fewer nodes are selected with higher priority. This can effectively reduce the errors caused by passing through nodes.

[0047] See also Figure 1 and Figure 2 In one embodiment of the present invention, a method for correcting the synchronization error of a transmission terminal in the entire network is provided. When performing a simulated line test, a contactless traveling wave terminal is installed directly below the simulated transmission line. Step S4 includes the following specific steps:

[0048] S401: Selecting and comparing the recorded waveforms of non-contact traveling wave terminals of different transmission lines in pairs;

[0049] S402: Calculate the points t1 and t1' where the amplitude of the recorded waveform of two different transmission line non-contact traveling wave terminals is 10%, and calculate the points t2 and t2' where the amplitude of the recorded waveform of two different transmission line non-contact traveling wave terminals is 90%;

[0050] S403: Calculate the point difference Δt1 of 10% of the amplitude of the recorded waveform of two different transmission line non-contact traveling wave terminals, and calculate the point difference Δt2 of 90% of the amplitude of the recorded waveform of two different transmission line non-contact traveling wave terminals;

[0051] S404: Simulation test without mesh, calculate (Δt1+Δt2) / 2, and obtain the correction error as ΔT=(Δt1+Δt2) / 2.

[0052] The master station compares the marked fault information in pairs, calculates the time points of 10% and 90% of the recorded waveform amplitude of the non-contact traveling wave terminals of two different transmission lines, and obtains the time points t1, t1' and t2, t2', and then calculates the difference of the time point of 10% of the recorded waveform amplitude Δt1 = t1-t1', and the difference of the time point of 90% of the recorded waveform amplitude Δt2 = t2-t2', and finally calculates the correction error of the recorded waveform of the non-contact traveling wave terminals of the two different transmission lines as ΔT = (Δt1+Δt2) / 2. Then, the correction errors of the non-contact traveling wave terminals of different transmission lines are calculated in pairs.

[0053] See also Figure 1 and Figure 3 In one embodiment of the present invention, a method for correcting the synchronization error of a transmission terminal in the entire network is provided. When performing a real line test, a contactless traveling wave terminal is installed on a tower of a real transmission line. Step S4 includes the following specific steps:

[0054] S401: Selecting and comparing the recorded waveforms of non-contact traveling wave terminals of different transmission lines in pairs;

[0055] S402: Calculate the points t1 and t1' where the amplitude of the recorded waveform of two different transmission line non-contact traveling wave terminals is 10%, and calculate the points t2 and t2' where the amplitude of the recorded waveform of two different transmission line non-contact traveling wave terminals is 90%;

[0056] S403: Calculate the point difference Δt1 of 10% of the amplitude of the recorded waveform of two different transmission line non-contact traveling wave terminals, and calculate the point difference Δt2 of 90% of the amplitude of the recorded waveform of two different transmission line non-contact traveling wave terminals;

[0057] S404: Calculate (Δt1+Δt2) / 2-L / V, and obtain the correction error ΔT=(Δt1+Δt2) / 2-L / V, where L is the distance between the non-connected traveling wave terminals of two different transmission lines, and V is the wave velocity of the traveling wave.

[0058] The master station compares the marked fault information in pairs, calculates the time points of 10% and 90% of the recorded waveform amplitude of the non-contact traveling wave terminals of two different transmission lines, and obtains the time points t1, t1' and t2, t2', and then calculates the time point difference of 10% of the recorded waveform amplitude Δt1 = t1-t1', and calculates the time point difference of 90% of the recorded waveform amplitude Δt2 = t2-t2', and finally calculates the correction error of the recorded waveform of the non-contact traveling wave terminals of the two different transmission lines as ΔT = (Δt1+Δt2) / 2-L / V, where L is the physical distance between the non-contact traveling wave terminals of the two different transmission lines, and V is the wave velocity of the traveling wave. Then, the correction errors of the non-contact traveling wave terminals of different transmission lines are calculated in pairs.

[0059] See also Figure 1 , Figure 2 and Figure 3 In one embodiment of the present invention, a method for correcting the synchronization error of the entire network of a power transmission terminal is provided. The contactless traveling wave terminal of the transmission line adopts a Beidou timing module or a GPS timing module or uses both the Beidou timing module and the GPS timing module for timing. The method of the present application is applicable to the above three timing module usage schemes.

[0060] See also Figure 1 , Figure 2 and Figure 3 In one embodiment of the present invention, a method for correcting the synchronization error of the entire power transmission terminal network is provided. The recorded waveform collected in step S1 is a closing traveling wave. By correcting the fault time correction information of the closing traveling wave, the closing traveling wave can be used to more accurately locate the fault position.

[0061] See also Figure 1 , Figure 2 and Figure 3 In one embodiment of the present invention, a method for correcting the synchronization error of the entire transmission terminal network is provided. The recorded waveform collected in step S1 is an out-of-zone discharge traveling wave. By correcting the fault time correction information of the out-of-zone discharge traveling wave, potential insulation defects and equipment failures can be more accurately identified, providing a basis for preventive maintenance.

[0062] The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. All equivalent structural changes made using the contents of the present invention's specification and drawings, or directly / indirectly applied in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. A method for correcting synchronization errors of a power transmission terminal network, characterized in that: The following steps are involved: S1: When a fault occurs, the non-connected traveling wave terminal of each transmission line triggers the fault information collection function. The collected fault information includes: recorded waveform and fault time; S2: Upload the fault information to the main station; S3: The master station receives the fault information of the non-contact traveling wave terminal of each transmission line, and marks the fault information of the non-contact traveling wave terminal of each transmission line; S4: Select the recorded waveforms of the non-connected traveling wave terminals of different transmission lines for comparison to obtain the correction error; S5: Output the correction error at the time of the fault and synchronize the correction error at the time of the fault of the entire network; When performing a simulated line test, the transmission line contactless traveling wave terminal is installed directly below the simulated transmission line, and step S4 includes the following specific steps: S401: Selecting and comparing the recorded waveforms of non-contact traveling wave terminals of different transmission lines in pairs; S402: Calculate the points t1 and t1' where the amplitude of the recorded waveform of two different transmission line non-contact traveling wave terminals is 10%, and calculate the points t2 and t2' where the amplitude of the recorded waveform of two different transmission line non-contact traveling wave terminals is 90%; S403: Calculate the point difference Δt1 of 10% of the amplitude of the recorded waveform of two different transmission line non-contact traveling wave terminals, and calculate the point difference Δt2 of 90% of the amplitude of the recorded waveform of two different transmission line non-contact traveling wave terminals; S404: Simulation test without mesh, calculate (Δt1+Δt2) / 2, and obtain the correction error as ΔT=(Δt1+Δt2) / 2; When performing a real line test, the transmission line contactless traveling wave terminal is installed on a tower of the real transmission line, and step S4 includes the following specific steps: S401: Selecting and comparing the recorded waveforms of non-contact traveling wave terminals of different transmission lines in pairs; S402: Calculate the points t1 and t1' where the amplitude of the recorded waveform of two different transmission line non-contact traveling wave terminals is 10%, and calculate the points t2 and t2' where the amplitude of the recorded waveform of two different transmission line non-contact traveling wave terminals is 90%; S403: Calculate the point difference Δt1 of 10% of the amplitude of the recorded waveform of two different transmission line non-contact traveling wave terminals, and calculate the point difference Δt2 of 90% of the amplitude of the recorded waveform of two different transmission line non-contact traveling wave terminals; S404: Calculate (Δt1+Δt2) / 2-L / V, and obtain the correction error ΔT=(Δt1+Δt2) / 2-L / V, where L is the distance between the non-connected traveling wave terminals of two different transmission lines, and V is the wave velocity of the traveling wave.

2. A method for correcting synchronization errors of a power transmission terminal network as claimed in claim 1, characterized in that: The contactless traveling wave terminal has a fault recorder.

3. A method for correcting synchronization errors of a power transmission terminal network as claimed in claim 2, characterized in that: The fault information also includes: a suspected fault location, and the fault information of the non-contact traveling wave terminal of the transmission line closest to the suspected fault location is selected according to the topological structure of the transmission line for comparison.

4. A method for correcting synchronization errors of a power transmission terminal network as claimed in claim 1, characterized in that: The contactless traveling wave terminal of the transmission line adopts Beidou and / or GPS timing modules for time synchronization.

5. A method for correcting synchronization errors of a power transmission terminal network as claimed in claim 1, characterized in that: The recorded waveform collected in step S1 is a closing traveling wave.

6. A method for correcting synchronization errors of a power transmission terminal network as claimed in claim 1, characterized in that: The recorded waveform collected in step S1 is a traveling wave of discharge outside the zone.

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