A method for wire dancing parameter inversion based on ground electromagnetic signal

Abstract

This invention proposes a method for inverting conductor galloping parameters based on ground wire electromagnetic signals. The method involves acquiring the ground wire electromagnetic signal and performing spectral analysis to identify additional frequency components. Based on the number and distribution characteristics of these additional frequency components, the order and frequency of conductor galloping are preliminarily determined. Using the preliminarily determined galloping order and frequency, the galloping amplitude and phase of each phase conductor are inverted using the correspondence between characteristic frequency components and galloping amplitude. Based on the verification results of the characteristic frequency components, the specific order of conductor galloping is determined, and the galloping parameters are output. This invention can identify the order of conductor galloping and invert parameters such as galloping amplitude and frequency, effectively solving the problem that traditional ground wire electromagnetic monitoring methods can only analyze first-order galloping.

Description

Technical Field

[0001] This invention relates to the field of high voltage technology, and in particular to a method for inverting conductor galloping parameters based on ground electromagnetic signals. Background Technology

[0002] Transmission lines are a crucial component of the power grid, and transmission line faults are the leading cause of power grid failures. Online monitoring of transmission line galloping is a vital aspect of transmission line galloping prevention. Currently, galloping monitoring technologies mainly include conductor contact-type galloping monitoring devices, represented by displacement / accelerometers and BeiDou positioning terminals, and non-contact optical galloping monitoring devices, primarily based on video monitoring. However, conductor contact-type galloping monitoring devices require power outages for installation or live-line work, are prone to wear and tear, and are extremely inconvenient to maintain and repair. Furthermore, multiple devices need to be deployed over long spans to monitor galloping characteristics at different half-wave numbers, resulting in high overall costs. On the other hand, non-contact optical galloping monitoring devices, primarily based on video monitoring, are often affected by severe weather during galloping events and cannot effectively detect conductor galloping characteristics.

[0003] Previous methods for monitoring and locating transmission line galloping based on ground wire electromagnetic signals could only address first-order galloping of conductors. In reality, second-order and third-order galloping can also occur. The characteristics of galloping of conductors of different orders are not the same. The analysis method of first-order galloping cannot be simply applied to second-order and third-order galloping. Moreover, there is currently no method to identify the order of conductor galloping. Summary of the Invention

[0004] The present invention aims to at least partially solve one of the technical problems in the related art.

[0005] Therefore, the first objective of this invention is to propose a method for inverting conductor galloping parameters based on ground wire electromagnetic signals. By analyzing the spectral characteristics of ground wire electromagnetic signals, the method realizes the inversion of parameters such as the order, amplitude, and frequency of galloping conductors in transmission lines.

[0006] The second objective of this invention is to propose a conductor galloping parameter inversion system based on ground wire electromagnetic signals.

[0007] To achieve the above objectives, a first aspect of the present invention proposes a method for inverting conductor galloping parameters based on ground wire electromagnetic signals, comprising the following steps:

[0008] S1: Acquire the electromagnetic signal from the ground wire and perform spectrum analysis to identify additional frequency components in the signal; S2, Based on the number and distribution characteristics of the additional frequency components, the order and frequency of the conductor's galloping are preliminarily determined; S3. Based on the preliminary judgment of the galloping order and galloping frequency, the galloping amplitude and phase of each phase conductor are inverted by utilizing the correspondence between the characteristic frequency components and the galloping amplitude. S4, based on the verification results of the characteristic frequency components, determines the specific order of the conductor galloping and outputs the galloping parameters.

[0009] In one embodiment of the present invention, the step of acquiring the ground electromagnetic signal and performing spectrum analysis to identify additional frequency components in the signal includes: The electromagnetic signal of the ground wire is obtained by monitoring the induced current on the ground wire of each base and the voltage at both ends of the insulator of the segmented insulated ground wire. The spectrum of the signal is obtained by performing a Fourier transform on the ground wire electromagnetic signal; The 50Hz fundamental frequency component and additional frequency components relative to the 50Hz fundamental frequency are identified from the spectrum.

[0010] In one embodiment of the present invention, the step of acquiring the ground electromagnetic signal and performing spectrum analysis to identify additional frequency components in the signal further includes: Calculate the ratio of the amplitude of the additional frequency component to the amplitude of the 50Hz frequency component; When the ratio exceeds a preset threshold, it is determined that the monitoring file has experienced conductor galloping.

[0011] In one embodiment of the present invention, the preliminary determination of the order and frequency of conductor galloping based on the number and distribution characteristics of the additional frequency components includes: When two additional frequency components are identified and are 50±df Hz, it is determined to be second-order galloping, and the galloping frequency of the three-phase conductors is the same. When four additional frequency components are identified and are 50±dfi Hz and 50±df Hz, if df equals 2×dfi, it is determined to be first-order or third-order galloping, and the galloping frequencies of the three-phase conductors are the same; if df is not equal to 2×dfi, it is determined to be second-order galloping, and the galloping frequencies of phase A and phase C conductors are different.

[0012] In one embodiment of the present invention, the step of preliminarily determining the order and frequency of conductor galloping based on the number and distribution characteristics of the additional frequency components further includes: When six additional frequency components are identified and are 50±dfi Hz, 50±df Hz, and 50±df3 Hz, and df equals 2×dfi, it is determined to be a first-order or third-order galloping. The galloping frequencies of phase A and phase C are the same but different from those of phase B. When eight additional frequency components are identified and are 50±df Hz, 50±df2 Hz, 50±df3 Hz, and 50±df4 Hz, and df equals 2×df1 and df4 equals 2×df2, it is determined to be a first-order or third-order galloping. The galloping frequency of phase A or phase C is the same as that of phase B, but different from that of the other phase. When 10 additional frequency components are identified, it is determined to be either first-order or third-order galloping, and the galloping frequencies of the three-phase conductors are all different.

[0013] In one embodiment of the present invention, the step of inverting the galloping amplitude and phase of each phase conductor based on the preliminarily determined galloping order and galloping frequency, and utilizing the correspondence between characteristic frequency components and galloping amplitude, includes: When initially determined to be first-order gobbling, a characteristic frequency component of 50±f is used. g The linear relationship between Hz and galloping amplitude is used to invert the galloping amplitude and phase of each phase conductor.

[0014] In one embodiment of the present invention, the step of inverting the galloping amplitude and phase of each phase conductor based on the preliminarily determined galloping order and galloping frequency, using the correspondence between characteristic frequency components and galloping amplitude, further includes: When initially determined to be second-order dancing, a characteristic frequency component of 50±2×f is used. g The relationship between Hz and the square of the galloping amplitude is used to invert the galloping amplitude and phase of each phase conductor.

[0015] In one embodiment of the present invention, in the inversion equation, m and n represent the induced signals 50±2×f in the ordinary ground wire GW and the fiber optic composite ground wire OPGW when only the corresponding conductors exhibit unit amplitude galloping. g The amplitude of the Hz characteristic frequency component; α and β represent the induced signals 50±2×f in GW and OPGW respectively when only the corresponding conductors exhibit unit amplitude galloping. g The phase of the Hz characteristic frequency component.

[0016] To achieve the above objectives, a second aspect of the present invention provides a refined inversion system for overhead line conductor galloping parameters, comprising: The signal recognition module is used to acquire the ground electromagnetic signal and perform spectrum analysis to identify additional frequency components in the signal. The feature determination module is used to preliminarily determine the order and frequency of conductor galloping based on the number and distribution characteristics of the additional frequency components. The data inversion module is used to invert the galloping amplitude and phase of each phase conductor based on the preliminary judgment of the galloping order and galloping frequency, using the correspondence between characteristic frequency components and galloping amplitude. The parameter determination module is used to determine the specific order of conductor galloping based on the verification results of characteristic frequency components, and output the galloping parameters.

[0017] The method of this invention, by analyzing the spectral characteristics of the ground wire electromagnetic signal, realizes the inversion of parameters such as the order, amplitude, and frequency of the galloping conductor of the transmission line, making the galloping monitoring scheme based on the ground wire electromagnetic signal more refined, and enabling maintenance personnel to have a more specific understanding of the line galloping situation.

[0018] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0019] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, wherein: Figure 1 A flowchart illustrating a method for inverting conductor galloping parameters based on ground wire electromagnetic signals, provided as an embodiment of the present invention; Figure 2 A schematic diagram of the ground wire operation mode and ground wire induction signal provided in an embodiment of the present invention; Figure 3 This is a schematic diagram of conductor galloping provided in an embodiment of the present invention; Figure 4 A schematic diagram of a tower structure provided for illustration of an embodiment of the present invention; Figure 5 The following are spectrum diagrams of ground wire induced signals during different orders of dancing, provided in embodiments of the present invention. Figure 6 Provided for embodiments of the present invention A graph showing the relationship between the amplitude of frequency components and the amplitude and frequency of conductor galloping. Figure 7 A detailed logic diagram of the conductor galloping parameter inversion method based on ground wire electromagnetic signals provided in this embodiment of the invention; Figure 8 This is a structural diagram of a conductor galloping parameter inversion system based on ground wire electromagnetic signals, provided in an embodiment of the present invention. Detailed Implementation

[0020] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0021] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0022] The following describes, with reference to the accompanying drawings, a method and system for inverting conductor galloping parameters based on ground wire electromagnetic signals, according to an embodiment of the present invention.

[0023] Example 1 Figure 1 This is a flowchart of a conductor galloping parameter inversion method based on ground wire electromagnetic signals, according to an embodiment of the present invention. Figure 1 As shown, the method includes the following steps: S1: Acquire the electromagnetic signal from the ground wire and perform spectrum analysis to identify additional frequency components in the signal; S2, Based on the number and distribution characteristics of the additional frequency components, the order and frequency of the conductor's galloping are preliminarily determined; S3. Based on the preliminary judgment of the galloping order and galloping frequency, the galloping amplitude and phase of each phase conductor are inverted by utilizing the correspondence between the characteristic frequency components and the galloping amplitude. S4, based on the verification results of the characteristic frequency components, determines the specific order of the conductor galloping and outputs the galloping parameters.

[0024] Specifically, taking the operation mode of grounding one ground wire base by base and segmented insulation and single-point grounding of one ground wire as an example, the technical solution of the present invention is explained. The monitored electromagnetic signals of the ground wire at this time are specifically: the induced current on the ground wire grounded base by base and the voltage across the insulator of the segmented insulation ground wire, as shown in the schematic diagram below. Figure 2 As shown.

[0025] When considering the order of conductor galloping, equation (1) can be used to characterize the motion characteristics of the conductor. Where x and y are as follows: Figure 3 As shown. The subscript 'i' represents the A / B / C phase conductors. Represents the frequency of dancing. Represents the dancing phase. The wavelength represents the arcing of the conductor. When the arcing wavelength is twice the span length, the conductor is in first-order arcing; when the arcing wavelength is equal to the span length, the conductor is in second-order arcing; and when the arcing length is two-thirds of the span length, the conductor is in third-order arcing.

[0026]

[0027] For details on the calculation method of the ground wire electromagnetic signal during galloping, please refer to "A Method and Device for Positioning Galloping Overhead Lines Based on Ground Wire Electromagnetic Signals". When describing the scheme, the selected overhead line structure is as follows: Figure 4 As shown.

[0028] The spectrum of ground wire induced signal under the vibration of conductors of different orders is as follows: Figure 5 As shown. Figure 5 In the diagram, (a) represents the goblin spectrum corresponding to the second-order goblin motion. Figure 5 (b) in the figure represents the dance spectrum corresponding to the first and third order dances.

[0029] according to Figure 5 Simulation results show that there are significant differences in the additional frequency components of the ground wire induced signal caused by odd-order and even-order conductor galloping. When the conductor gallops at an odd order, the superimposed additional frequency components are... Hz and Hz; while even-order dancing only adds up. The Hz component. This phenomenon is caused by the opposite motion of the two parts of the conductor during second-order galloping, thus canceling each other out in the electromagnetic coupling between the conductor and ground. It can also be seen that, at the same galloping amplitude, the third-order galloping... The amplitude of the Hz frequency component is significantly smaller than that of the first order, but The amplitude of the Hz frequency component is roughly equivalent in both galloping orders, which can be used to distinguish between first-order and third-order galloping. Conductor galloping amplitude, frequency, and... The linear relationship between the amplitudes of the Hz frequency components has been shown and analyzed previously. Figure 6 Showing The relationship between the amplitude of the Hz frequency component and the amplitude and frequency of conductor galloping. It can be seen that the galloping frequency has virtually no effect on the amplitude of the frequency component, and the amplitude of the frequency component is approximately proportional to the square of the conductor galloping amplitude. Based on this relationship, it is possible to inversely deduce the second-order galloping amplitude of the conductor from the ground wire induced signal, as shown in equation 2. In the equation, m and n represent the distributions of GW (ordinary ground wire, corresponding to) when only the corresponding conductor undergoes unit amplitude galloping. Figure 5 ) and OPGW (optical fiber composite ground wire, corresponding to Figure 5 Induction signal in ) The amplitude of the Hz characteristic frequency component; , This means that GW (ordinary ground wire, corresponding to) only occurs when the corresponding conductor experiences a unit amplitude gallop. Figure 5 ) and OPGW (optical fiber composite ground wire, corresponding to Figure 5 Induction signal in ) The phase of the Hz characteristic frequency component, with the right side of the equation representing the amplitude and phase of the monitoring result. For For the Hz frequency component, the inverse equation can be found in "A Method for Identifying Galloping Conductors in Transmission Lines Based on Ground Wire Electromagnetic Signals".

[0030]

[0031] Based on the above specific principles, a flowchart of the technical solution for identifying galloping conductors can be formed as follows: Figure 7 As shown: The first step is to determine whether galloping has occurred in the monitoring section based on the spectrum of the ground wire induction signal. The basis for the judgment is the ratio of the amplitude of the additional frequency component to the amplitude of the 50 Hz frequency component. Second-order galloping usually results in a smaller frequency component, thus determining the threshold. The exact threshold value depends on the structure of the transmission line and the galloping amplitude of interest. The second step is to preliminarily determine the galloping frequency and galloping order based on the number of additional frequency components. Different numbers of additional frequency components represent different galloping situations. This invention assumes that the galloping frequencies of the three conductors do not differ by more than 50%. In this step, it is relatively difficult to distinguish between first-order and third-order galloping situations. The third step is to derive the galloping amplitude and phase based on the galloping situation obtained in the second step. In this step, it is assumed that all odd-numbered galloping patterns are first-order patterns. For first-order galloping, refer to "A method for identifying galloping conductors in transmission lines based on ground wire electromagnetic signals". For first-order galloping, the specific back-calculation equation is Equation (2). The last step is based on The Hz characteristic frequency component test specifically examines whether it's a first-order or third-order gallop. [Previously, an amplitude was derived under the assumption of first-order; if this assumption holds, then this amplitude will cause...] Equation (2) corresponding to the Hz characteristic frequency component also holds true; if the obtained dancing amplitude does not hold true when substituted into equation (2), it proves that it is a third-order dancing. Table 1 below shows the reverse calculation results of the dancing parameters, proving the feasibility of the present invention.

[0032] Table 1

[0033] According to an embodiment of the present invention, a method for inverting conductor galloping parameters based on ground wire electromagnetic signals is used to invert parameters such as the order, amplitude, and frequency of galloping conductors in transmission lines by analyzing the spectral characteristics of the ground wire electromagnetic signals.

[0034] To implement the method of the embodiments of the present invention, the present invention also proposes a conductor galloping parameter inversion system 10 based on ground wire electromagnetic signals, such as... Figure 8 As shown, it includes: The signal recognition module 100 is used to acquire the ground electromagnetic signal and perform spectrum analysis to identify additional frequency components in the signal. The feature judgment module 200 is used to preliminarily determine the order and frequency of the conductor galloping based on the number and distribution characteristics of the additional frequency components. The data inversion module 300 is used to invert the galloping amplitude and phase of each phase conductor based on the preliminary judgment of the galloping order and galloping frequency, using the correspondence between the characteristic frequency components and the galloping amplitude. The parameter determination module 400 is used to determine the specific order of conductor galloping based on the verification results of characteristic frequency components, and output the galloping parameters.

[0035] According to an embodiment of the present invention, a conductor galloping parameter inversion system based on ground wire electromagnetic signals is used to invert parameters such as the order, amplitude, and frequency of galloping conductors in transmission lines by analyzing the spectral characteristics of the ground wire electromagnetic signals.

[0036] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

[0037] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0038] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

Claims

1. A method for inverting conductor galloping parameters based on ground wire electromagnetic signals, characterized in that, Includes the following steps: S1: Acquire the electromagnetic signal from the ground wire and perform spectrum analysis to identify additional frequency components in the signal; S2, Based on the number and distribution characteristics of the additional frequency components, the order and frequency of the conductor's galloping are preliminarily determined; S3. Based on the preliminary judgment of the galloping order and galloping frequency, the galloping amplitude and phase of each phase conductor are inverted by utilizing the correspondence between the characteristic frequency components and the galloping amplitude. S4, based on the verification results of the characteristic frequency components, determines the specific order of the conductor galloping and outputs the galloping parameters.

2. The method as described in claim 1, characterized in that, The process of acquiring the ground wire electromagnetic signal and performing spectrum analysis to identify additional frequency components in the signal includes: The electromagnetic signal of the ground wire is obtained by monitoring the induced current on the ground wire of each base and the voltage at both ends of the insulator of the segmented insulated ground wire. The spectrum of the signal is obtained by performing a Fourier transform on the ground wire electromagnetic signal; The 50Hz fundamental frequency component and additional frequency components relative to the 50Hz fundamental frequency are identified from the spectrum.

3. The method as described in claim 2, characterized in that, The step of acquiring the ground wire electromagnetic signal and performing spectrum analysis to identify additional frequency components in the signal also includes: Calculate the ratio of the amplitude of the additional frequency component to the amplitude of the 50Hz frequency component; When the ratio exceeds a preset threshold, it is determined that the monitoring file has experienced conductor galloping.

4. The method as described in claim 1, characterized in that, The preliminary determination of the order and frequency of conductor galloping based on the quantity and distribution characteristics of the additional frequency components includes: When two additional frequency components are identified and are 50±df Hz, it is determined to be second-order galloping, and the galloping frequency of the three-phase conductors is the same. When four additional frequency components are identified and are 50±dfi Hz and 50±df Hz, if df equals 2×dfi, it is determined to be first-order or third-order galloping, and the galloping frequencies of the three-phase conductors are the same; if df is not equal to 2×dfi, it is determined to be second-order galloping, and the galloping frequencies of phase A and phase C conductors are different.

5. The method as described in claim 1, characterized in that, The preliminary determination of the order and frequency of conductor galloping based on the quantity and distribution characteristics of the additional frequency components also includes: When six additional frequency components are identified and are 50±dfi Hz, 50±df Hz, and 50±df3 Hz, and df equals 2×dfi, it is determined to be a first-order or third-order galloping. The galloping frequencies of phase A and phase C are the same but different from those of phase B. When eight additional frequency components are identified and are 50±df Hz, 50±df2 Hz, 50±df3 Hz, and 50±df4 Hz, and df equals 2×df1 and df4 equals 2×df2, it is determined to be a first-order or third-order galloping. The galloping frequency of phase A or phase C is the same as that of phase B, but different from that of the other phase. When 10 additional frequency components are identified, it is determined to be either first-order or third-order galloping, and the galloping frequencies of the three-phase conductors are all different.

6. The method as described in claim 1, characterized in that, The process of inverting the galloping amplitude and phase of each phase conductor based on the preliminary judgment of the galloping order and frequency, using the correspondence between characteristic frequency components and galloping amplitude, includes: When initially determined to be first-order gobbling, a characteristic frequency component of 50±f is used. g The linear relationship between Hz and galloping amplitude is used to invert the galloping amplitude and phase of each phase conductor.

7. The method as described in claim 1, characterized in that, The step of inverting the galloping amplitude and phase of each phase conductor based on the preliminary judgment of the galloping order and frequency, using the correspondence between characteristic frequency components and galloping amplitude, also includes: When initially determined to be second-order dancing, a characteristic frequency component of 50±2×f is used. g The relationship between Hz and the square of the galloping amplitude is used to invert the galloping amplitude and phase of each phase conductor.

8. The method as described in claim 7, characterized in that, In the inversion equation, m and n represent the induced signal 50±2×f in the ordinary ground wire GW and the fiber optic composite ground wire OPGW when only the corresponding conductor experiences unit amplitude galloping, respectively. g The amplitude of the Hz characteristic frequency component; α and β represent the induced signals 50±2×f in GW and OPGW respectively when only the corresponding conductors exhibit unit amplitude galloping. g The phase of the Hz characteristic frequency component.

9. A conductor galloping parameter inversion system based on ground wire electromagnetic signals, characterized in that, include: The signal recognition module is used to acquire the ground electromagnetic signal and perform spectrum analysis to identify additional frequency components in the signal. The feature determination module is used to preliminarily determine the order and frequency of conductor galloping based on the number and distribution characteristics of the additional frequency components. The data inversion module is used to invert the galloping amplitude and phase of each phase conductor based on the preliminary judgment of the galloping order and galloping frequency, using the correspondence between characteristic frequency components and galloping amplitude. The parameter determination module is used to determine the specific order of conductor galloping based on the verification results of characteristic frequency components, and output the galloping parameters.

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