Electric field detection method and system for resisting galloping of power transmission line, electronic equipment and storage medium

Abstract

The invention relates to the technical field of intelligent power grids, in particular to an electric field detection method and system for resisting power transmission line galloping, electronic equipment and a storage medium, and the method comprises the steps: obtaining a measurement electric field signal of a wire at an electric field sensor and related parameters of the wire; constructing a power transmission line electric field model based on wire related parameters, and extracting a power transmission line theoretical electric field signal; calculating a predicted electric field signal based on a filtering algorithm; and updating a filtering weighting coefficient according to an error between the measured electric field signal and a theoretical electric field signal, and calculating an electric field estimation value which is not influenced by galloping. The objective of the invention is to solve the technical problem of insufficient accuracy of an electric field detection result caused by power transmission line galloping and realize accurate and stable electric field measurement.

Description

Technical Field

[0001] The present invention relates to the field of smart grid technology, and in particular to an electric field detection method, system, electronic equipment and storage medium for resisting power transmission line galloping. Background Art

[0002] As an important part of the power system, the safe and stable operation of overhead transmission lines is directly related to the safety and reliability of the entire power grid. In recent years, with the continuous expansion of the power grid and the increase in voltage levels, the frequency of abnormal conditions in the operation of transmission lines has increased. These abnormal conditions not only affect the normal operation of the power system, but may also cause serious safety accidents and endanger the overall safety of the system. Therefore, in order to improve the safety and reliability of transmission lines, it is particularly important to accurately perceive the abnormal conditions of transmission lines in the early stage. Through timely manual intervention, the continued development of abnormal conditions can be effectively avoided, thereby preventing accidents.

[0003] At present, electric field sensors have been used in the field of electric field detection of overhead transmission lines due to their advantages such as small size and low power consumption. Specifically, electric field sensors are installed at the target location, and an electric field measurement model is constructed based on the spatial distance between the transmission line and the electric field sensor. However, due to factors such as foreign body intrusion, strong winds, and mechanical failures, transmission lines will inevitably experience short-term or long-term dancing. Since the dancing of the conductor will cause the spatial position of the conductor to change frequently, causing instability in the electric field distribution, the electric field sensor cannot accurately reflect the actual state of the conductor, thereby reducing the accuracy and effectiveness of the electric field measurement results of the electric field sensor. Summary of the invention

[0004] In order to solve the technical problem of insufficient accuracy of electric field detection results caused by transmission line galloping and realize accurate and stable electric field measurement, the purpose of the present invention is to provide an electric field detection method, system, electronic device and storage medium that are resistant to transmission line galloping. The technical solutions adopted are as follows:

[0005] The technical solution of the first aspect of the present invention provides an electric field detection method for resisting the galloping of a power transmission line, the method comprising:

[0006] Obtaining a measured electric field signal of the conductor at the electric field sensor and related parameters of the conductor;

[0007] Construct the electric field model of the transmission line based on the relevant parameters of the conductor and extract the theoretical electric field signal of the transmission line;

[0008] Calculate and predict electric field signals based on filtering algorithms;

[0009] The filter weight coefficient is updated according to the error between the measured electric field signal and the theoretical electric field signal, and the electric field estimation value not affected by the dancing is calculated.

[0010] Furthermore, the conductor related parameters include at least the voltage, height, radius of the conductor and the horizontal distance between the conductor and the electric field sensor.

[0011] Furthermore, based on the relevant parameters of the conductor, the electric field model of the transmission line is constructed, and the theoretical electric field signal of the transmission line is extracted, including:

[0012] Calculate the electric field contribution of the conductor based on the conductor related parameters;

[0013] The electric field contributions of all conductors of the transmission line are summed to obtain the theoretical electric field signal of the transmission line.

[0014] Furthermore, the expression of the theoretical electric field signal of the transmission line is:

[0015]

[0016] In the formula, e t (k) represents the theoretical electric field signal of the transmission line at time k; e i (k) represents the electric field contribution of the i-th conductor at time k; N represents the number of conductors in the transmission line; u i (k) represents the theoretical voltage of the i-th wire at time k; h i represents the height of the i-th wire; d i represents the horizontal distance between the i-th wire and the electric field sensor; r i0 represents the radius of the i-th wire.

[0017] Further, calculating and predicting the electric field signal based on the filtering algorithm includes:

[0018] Obtain the theoretical electric field signal vector and filter weight vector, and calculate the electric field prediction value, which is expressed as:

[0019] e p (k) = E t T (k)W(k)

[0020] In the formula, e p (k) represents the predicted electric field signal of the transmission line at time k; E t (k) represents the theoretical electric field signal vector of the transmission line at time k, E t (k) = [e t (k),e t (k-1),…,e t (k-L+1)] T , L represents the tap length of the filter; T represents the transpose; W(k) represents the filter weight vector at time k, W(k) = [w(k), w(k-1), …, w(k-l+1)]T .

[0021] Furthermore, the expression for updating the filter weight coefficient according to the error between the measured electric field signal and the theoretical electric field signal is:

[0022]

[0023] Wherein, w(k) represents the filter weighting coefficient at time k; w(k-1) represents the filter weighting coefficient at time k-1; μ represents the fixed convergence factor for controlling the misalignment between 0 and 1; α represents the adjustment coefficient, α>0; ε(k) represents the difference between the measured electric field signal and the theoretical electric field signal at time k, ε(k)=e m (k)-e t (k), e m (k) represents the electric field signal measured at time k.

[0024] Further, updating the filter weighting coefficient according to the error between the measured electric field signal and the theoretical electric field signal and calculating the electric field estimation value not affected by the dancing also includes:

[0025] The optimal filter weight coefficient is extracted with the goal of minimizing the cost function. The expression of the cost function is:

[0026]

[0027] Where J(k) represents the cost function at time k; L represents the tap length of the filter; λ represents the forgetting factor; and j represents the index variable.

[0028] The technical solution of the second aspect of the present invention provides an electric field detection system for resisting the galloping of a power transmission line, adopting the electric field detection method for resisting the galloping of a power transmission line described in the technical solution of the first aspect of the present invention, and the system comprises:

[0029] A signal acquisition module, configured to obtain a measured electric field signal of the conductor at the electric field sensor and related parameters of the conductor;

[0030] A transmission line electric field simulation module, configured to construct a transmission line electric field model based on conductor related parameters and extract theoretical electric field signals of the transmission line;

[0031] The electric field estimation module is configured to calculate the predicted electric field signal based on the filtering algorithm; update the filtering weighting coefficient according to the error between the measured electric field signal and the theoretical electric field signal and calculate the electric field estimation value not affected by the dancing.

[0032] The technical solution of the third aspect of the present invention provides an electronic device, which includes: a processor and a memory communicatively connected to the processor; wherein the memory stores instructions executable by the processor, and the instructions are executed by the processor so that the processor can execute the steps of the electric field detection method for resisting power transmission line swaying described in the technical solution of the first aspect of the present invention.

[0033] The technical solution of the fourth aspect of the present invention provides a computer-readable storage medium, on which is stored a program for implementing an electric field detection method for resisting the galloping of a transmission line. The program for implementing an electric field detection method for resisting the galloping of a transmission line is executed by a processor to implement the steps of the electric field detection method for resisting the galloping of a transmission line described in the technical solution of the first aspect of the present invention.

[0034] The present invention has the following beneficial effects:

[0035] The electric field detection method, system, electronic device and storage medium for resisting the galloping of a transmission line provided by the present invention construct an electric field model of the transmission line through conductor-related parameters, and based on a filtering algorithm, update the filtering weighting coefficient according to the error between the measured electric field signal and the theoretical electric field signal, and finally calculate the electric field estimation value not affected by the galloping according to the updated filtering weighting coefficient and the theoretical electric field signal; by dynamically adjusting the filtering weighting coefficient and taking the conductor-related parameters as the basis, even when the conductor position changes frequently, it is possible to quickly respond to the electric field change, effectively reducing the measured electric field interference caused by the change in the spatial position of the conductor caused by the galloping of the transmission line, ensuring the accuracy and effectiveness of the electric field measurement results, and providing a basis for accurate perception of the operating status of the transmission line. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions and advantages in the embodiments of the present invention or the prior art, the drawings required for use in the embodiments or the prior art descriptions are 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 these drawings without paying creative work.

[0037] Figure 1 A method flow chart of an electric field detection method for resisting power transmission line galloping provided by an embodiment of the present invention;

[0038] Figure 2 A schematic diagram of the structure of an electric field detection system for resisting power transmission line galloping provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0039] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the following is a detailed description of the electric field detection method, system, electronic device and storage medium for resisting the galloping of transmission lines proposed by the present invention, its specific implementation method, structure, features and effects in combination with the accompanying drawings and preferred embodiments. In the following description, different "one embodiment" or "another embodiment" does not necessarily refer to the same embodiment. In addition, specific features, structures or characteristics in one or more embodiments may be combined in any suitable form.

[0040] Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

[0041] The following is a detailed description of a specific scheme of an electric field detection method, system, electronic device and storage medium for resisting power transmission line galloping provided by the present invention in conjunction with the accompanying drawings.

[0042] See also Figure 1 , which shows a method flow chart of an electric field detection method for resisting power transmission line galloping provided by an embodiment of the present invention, the method comprising:

[0043] Step S100: obtaining the measured electric field signal of the conductor at the electric field sensor and the related parameters of the conductor; specifically, using the electric field sensor to measure the electric field signal of the transmission line, the related parameters of the conductor at least include the voltage, height, radius of the conductor and the horizontal distance between the conductor and the electric field sensor; specifically, the electric field sensor continuously collects the electric field signal e around the transmission line for a period of time m (k) The electric field strength is converted into an electrical signal and transmitted to the signal processing center by wire or wireless means. The voltage of the conductor can be obtained by querying the archive value, or the voltage information of the conductor can be obtained through the power system's monitoring and signal acquisition system (SCADA). The height of the conductor and the distance between the conductor and the electric field sensor can be achieved by methods such as laser rangefinder, image processing recognition, and GPS positioning.

[0044] Step S200: constructing a transmission line electric field model based on conductor related parameters, and extracting a transmission line theoretical electric field signal;

[0045] Step S200 specifically includes:

[0046] Step S210: Calculate the electric field contribution of the conductor according to the relevant parameters of the conductor; specifically, on the one hand, the influence of the height and horizontal distance of the conductor on the electric field strength is considered, and on the other hand, the influence of the radius of the conductor on the electric field strength is considered. The electric field contribution of the conductor in combination of the two aspects can be expressed as:

[0047]

[0048] In the formula, e i (k) represents the electric field contribution of the i-th wire at time k; u i (k) represents the theoretical voltage of the i-th wire at time k; h i represents the height of the i-th wire; d i represents the horizontal distance between the i-th wire and the electric field sensor; r i0 represents the radius of the ith conductor; this embodiment accurately calculates the theoretical electric field contribution of each conductor at a specified position based on the actual parameters of the conductor, thereby ensuring the accuracy of the theoretical electric field signal, so as to better correct the measurement deviation caused by the conductor dancing in the subsequent adaptive filtering process, thereby improving the accuracy and effectiveness of the electric field detection results.

[0049] Step S220: summing up the electric field contributions of all conductors of the transmission line to obtain a theoretical electric field signal of the transmission line. The expression of the theoretical electric field signal of the transmission line is:

[0050]

[0051] In the formula, e t (k) represents the theoretical electric field signal of the transmission line at time k; e i (k) represents the electric field contribution of the i-th conductor at time k; N represents the number of conductors in the transmission line; u i (k) represents the theoretical voltage of the i-th wire at time k; h i represents the height of the i-th wire; d i represents the horizontal distance between the i-th wire and the electric field sensor; r i0 represents the radius of the i-th conductor; this formula obtains the overall theoretical electric field signal of the transmission line by summing the electric field contributions of all conductors to accurately reflect the electric field distribution of the entire transmission line at a specified position.

[0052] Step S300: Calculate and predict the electric field signal based on a filtering algorithm; specifically, the filtering algorithm may be a filtering algorithm such as an adaptive recursive least squares filtering algorithm, a Kalman filtering algorithm, a particle filtering algorithm, etc.;

[0053] Step S300 specifically includes:

[0054] Step S310: Obtain the theoretical electric field signal vector and the filter weight vector, and calculate the electric field prediction value, which is expressed as:

[0055] e p (k) = E t T (k)W(k)

[0056] In the formula, e p (k) represents the predicted electric field signal of the transmission line at time k; Et (k) represents the theoretical electric field signal vector of the transmission line at time k, E t (k) = [e t (k),e t (k-1),…,e t (k-L+1)] T , L represents the tap length of the filter; T represents the transpose; W(k) represents the filter weight vector at time k, W(k) = [w(k), w(k-1), …, w(k-L+1)] T ;

[0057] Step S400: updating the filter weighting coefficient according to the error between the measured electric field signal and the theoretical electric field signal and calculating the electric field estimation value not affected by the dancing; wherein, the expression for updating the filter weighting coefficient according to the error between the measured electric field signal and the theoretical electric field signal is:

[0058]

[0059] Wherein, w(k) represents the filter weighting coefficient at time k; w(k-1) represents the filter weighting coefficient at time k-1; μ represents the fixed convergence factor for controlling the misalignment between 0 and 1; α represents the adjustment coefficient, α>0; ε(k) represents the difference between the measured electric field signal and the theoretical electric field signal at time k, ε(k)=e m (k)-e t (k), e m (k) represents the electric field signal measured at time k; specifically, by combining the theoretical electric field signal and the actual measured electric field signal, the weight coefficient is dynamically adjusted using an adaptive filtering algorithm to minimize the error between the measured electric field signal and the theoretical electric field signal. The weight coefficient is dynamically updated over time and can reflect changes in the position of the conductor in real time, thereby enhancing the adaptive ability of the system, effectively reducing the measurement error caused by conductor dancing, and providing a more stable and reliable electric field estimate.

[0060] Step S400 also includes:

[0061] Step S410: extracting the optimal filter weight coefficient with the goal of minimizing the cost function, the expression of the cost function is:

[0062]

[0063] Wherein, J(k) represents the cost function at time k; L represents the tap length of the filter; λ represents the forgetting factor, 0<λ≤1; j represents the index variable; ε(kj) represents the error from time k to time k-L+1; in this embodiment, by adjusting the filter weighting coefficient to minimize the cost function, the error between the measured electric field signal and the theoretical electric field signal can be effectively reduced, thereby improving the accuracy of the electric field estimation; by utilizing the forgetting factor and the filter length, the weighting coefficient can be dynamically adjusted in different time periods to better adapt to the changes caused by the dancing of the wire, and by comprehensively considering the errors at multiple time points, the robustness of the system is improved, and a stable electric field estimation can be provided even in the presence of noise and interference; the recursive least squares adaptive filtering algorithm can converge quickly in real-time applications, thereby ensuring the timeliness and reliability of the electric field detection results.

[0064] To summarize, the electric field detection method for resisting the galloping of a transmission line provided by the present invention constructs an electric field model of the transmission line through conductor-related parameters, and based on a filtering algorithm, updates the filtering weighting coefficient according to the error between the measured electric field signal and the theoretical electric field signal, and finally calculates the electric field estimation value not affected by the galloping according to the updated filtering weighting coefficient and the theoretical electric field signal; by dynamically adjusting the filtering weighting coefficient and taking the conductor-related parameters as the basis, it is possible to quickly respond to electric field changes even when the conductor position changes frequently, effectively reducing the measured electric field interference caused by the change in the spatial position of the conductor caused by the galloping of the transmission line, ensuring the accuracy and effectiveness of the electric field measurement results, and providing a basis for accurate perception of the operating status of the transmission line.

[0065] See also Figure 2 The technical solution of the second aspect of the present invention provides an electric field detection system for resisting the galloping of a power transmission line, adopting the electric field detection method for resisting the galloping of a power transmission line described in the technical solution of the first aspect of the present invention, and the system comprises:

[0066] A signal acquisition module, configured to obtain a measured electric field signal of the conductor at the electric field sensor and related parameters of the conductor;

[0067] A transmission line electric field simulation module, configured to construct a transmission line electric field model based on conductor related parameters and extract theoretical electric field signals of the transmission line;

[0068] The electric field estimation module is configured to calculate the predicted electric field signal based on the filtering algorithm; update the filtering weighting coefficient according to the error between the measured electric field signal and the theoretical electric field signal and calculate the electric field estimation value not affected by the dancing.

[0069] The technical solution of the third aspect of the present invention provides an electronic device, which includes: a processor and a memory communicatively connected to the processor; wherein the memory stores instructions executable by the processor, and the instructions are executed by the processor so that the processor can execute the steps of the electric field detection method for resisting power transmission line swaying described in the technical solution of the first aspect of the present invention.

[0070] The technical solution of the fourth aspect of the present invention provides a computer-readable storage medium, on which is stored a program for implementing an electric field detection method for resisting the galloping of a transmission line. The program for implementing an electric field detection method for resisting the galloping of a transmission line is executed by a processor to implement the steps of the electric field detection method for resisting the galloping of a transmission line described in the technical solution of the first aspect of the present invention.

[0071] It should be noted that the sequence of the above embodiments of the present invention is only for description and does not represent the advantages and disadvantages of the embodiments. The processes depicted in the accompanying drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0072] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referenced to each other, and each embodiment focuses on the differences from other embodiments.

Claims

1. An electric field detection method for resisting power transmission line galloping, characterized in that: The method comprises Obtaining a measured electric field signal of the conductor at the electric field sensor and related parameters of the conductor; Construct the electric field model of the transmission line based on the relevant parameters of the conductor and extract the theoretical electric field signal of the transmission line; Calculate and predict electric field signals based on filtering algorithms; The filter weight coefficient is updated according to the error between the measured electric field signal and the theoretical electric field signal, and the electric field estimation value not affected by the dancing is calculated.

2. The electric field detection method for resisting power transmission line galloping according to claim 1, characterized in that: The conductor related parameters at least include the voltage, height, radius of the conductor and the horizontal distance between the conductor and the electric field sensor.

3. The electric field detection method for resisting power transmission line galloping according to claim 1, characterized in that: The electric field model of the transmission line is constructed based on the relevant parameters of the conductor, and the theoretical electric field signal of the transmission line is extracted, including: Calculate the electric field contribution of the conductor based on the conductor related parameters; The electric field contributions of all conductors of the transmission line are summed to obtain the theoretical electric field signal of the transmission line.

4. The electric field detection method for resisting power transmission line galloping as claimed in claim 3, characterized in that: The expression of the theoretical electric field signal of the transmission line is: In the formula, e t (k) represents the theoretical electric field signal of the transmission line at time k; e i (k) represents the electric field contribution of the i-th conductor at time k; N represents the number of conductors in the transmission line; u i (k) represents the theoretical voltage of the i-th wire at time k; h i represents the height of the i-th wire; d i represents the horizontal distance between the i-th wire and the electric field sensor; r i0 represents the radius of the i-th wire.

5. The electric field detection method for resisting power transmission line galloping according to claim 1, characterized in that: The electric field signal is calculated and predicted based on the filtering algorithm, including: Obtain the theoretical electric field signal vector and filter weight vector, and calculate the electric field prediction value, which is expressed as: and p (k)=E t T (k)In(k) In the formula, e p (k) represents the predicted electric field signal of the transmission line at time k; E t (k) represents the theoretical electric field signal vector of the transmission line at time k, E t (k) = [e t (k),e t (k-1),…,e t (k-L+1)] T , L represents the tap length of the filter; T represents the transpose; W(k) represents the filter weight vector at time k, W(k) = [w(k), w(k-1), …, w(k-L+1)] T .

6. The electric field detection method for resisting power transmission line galloping as claimed in claim 5, characterized in that: The expression for updating the filter weight coefficient according to the error between the measured electric field signal and the theoretical electric field signal is: Wherein, w(k) represents the filter weighting coefficient at time k; w(k-1) represents the filter weighting coefficient at time k-1; μ represents the fixed convergence factor for controlling the misalignment between 0 and 1; α represents the adjustment coefficient, α>0; ε(k) represents the difference between the measured electric field signal and the theoretical electric field signal at time k, ε(k)=e m (k)-e t (k), e m (k) represents the electric field signal measured at time k.

7. The electric field detection method for resisting power transmission line galloping according to any one of claims 1 to 6, characterized in that: Updating the filter weighting coefficient according to the error between the measured electric field signal and the theoretical electric field signal and calculating the electric field estimation value not affected by the dancing also includes: The optimal filter weight coefficient is extracted with the goal of minimizing the cost function. The expression of the cost function is: Where J(k) represents the cost function at time k; L represents the tap length of the filter; λ represents the forgetting factor; and j represents the index variable. 8.An electric field detection system for resisting power transmission line galloping, characterized in that: The electric field detection method for resisting the galloping of a transmission line according to any one of claims 1 to 7 is adopted, and the system comprises: A signal acquisition module, configured to obtain a measured electric field signal of the conductor at the electric field sensor and related parameters of the conductor; A transmission line electric field simulation module, configured to construct a transmission line electric field model based on conductor related parameters and extract theoretical electric field signals of the transmission line; The electric field estimation module is configured to calculate the predicted electric field signal based on the filtering algorithm; update the filtering weighting coefficient according to the error between the measured electric field signal and the theoretical electric field signal and calculate the electric field estimation value not affected by the dancing.

9. An electronic device, characterized in that: The electronic device includes: a processor and a memory communicatively connected to the processor; wherein the memory stores instructions executable by the processor, and the instructions are executed by the processor so that the processor can execute the steps of the electric field detection method for resisting power transmission line galloping as described in any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a program for implementing an electric field detection method for resisting the galloping of a transmission line, and the program for implementing an electric field detection method for resisting the galloping of a transmission line is executed by a processor to implement the steps of the electric field detection method for resisting the galloping of a transmission line as described in any one of claims 1 to 7.

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