A method for monitoring conductor icing based on tension correction

Abstract

The present invention aims to provide a wire icing monitoring method based on tension correction, which can significantly improve the accuracy of ice thickness measurement by continuously correcting the original tension value. The method comprises the following steps: (1) installing a camera, a micro-meteorological sensor, two tension sensors and a simulated wire on a transmission wire tower on a transmission line; (2) the background server performs original tension correction according to the received temperature data and tension data; (3) the background server calculates the current simulated wire icing thickness according to the corrected original tension data and the newly uploaded tension data using an ice thickness calculation formula; (4) predicting the temperature change trend of the tower, and obtaining the final real wire icing value after comprehensive analysis based on the temperature change trend, the last simulated wire icing monitoring value and the simulated wire icing value monitored this time. The present invention can be applied to the technical field of icing monitoring of power transmission lines.

Description

Technical Field

[0001] The present invention relates to the technical field of ice-coating monitoring of power transmission lines, and in particular to a wire ice-coating monitoring method based on tension correction. Background Art

[0002] As the impact of climate change on the power transmission system becomes increasingly severe, ice monitoring of transmission lines has become one of the key technologies to ensure the stable operation of the power grid. The existing common solution is to calculate the ice thickness based on the ice weighing method. When the tension sensor is working normally, this method calculates the weight of the ice on the conductor by subtracting the original tension value from the current tension value. Then, the ice thickness can be calculated based on the ice weight and the conductor diameter and vertical span through the ice formula. However, as time goes by, the overload of ice will cause the tension sensor to creep and the tension value to be inaccurately measured, which will result in the weighing method failing to monitor the true ice thickness.

[0003] Therefore, it is urgent to design a method that can effectively solve the problem of wire ice thickness monitoring when the tension sensor fails, so as to solve the above problems. Summary of the invention

[0004] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a wire icing monitoring method based on tension correction, which significantly improves the accuracy of ice thickness measurement by continuously correcting the original tension value.

[0005] The technical solution adopted by the present invention is that the method comprises the following steps:

[0006] (1) A camera, a micro-meteorological sensor, two tension sensors and a section of simulated wire are installed on a transmission line tower, wherein the two tension sensors are arranged at two different positions on the simulated wire, wherein the camera is aimed at the simulated wire, and at a set frequency, the micro-meteorological sensor reads temperature data and transmits it back to a backend server, the tension sensor reads tension data and transmits it back to the backend server, and the camera captures a clear picture of the simulated wire and transmits it back to the backend server;

[0007] (2) the backend server performs original tension correction according to the received temperature data and tension data;

[0008] (3) The backend server calculates the current simulated conductor ice thickness based on the corrected original tension data and the newly uploaded tension data using the ice thickness calculation formula;

[0009] (4) Predict the temperature change trend of the tower, and obtain the final actual conductor icing value by comprehensive analysis based on the temperature change trend, the last simulated conductor icing monitoring value, and the simulated conductor icing value of this monitoring;

[0010] (5) The conductor ice thickness value obtained in step (4) and the conductor ice picture taken by the camera are transmitted back to the background. If the ice thickness reaches the threshold for manual de-icing, personnel are arranged to start the conductor ice melting mechanism; if the conductor ice thickness does not reach the set ice melting threshold, manual marking is performed.

[0011] Furthermore, in step (2), the specific steps of performing the original tension correction are:

[0012] The background server reads the temperature data from the micro-meteorological sensor. When the temperature is greater than 2 degrees, the current tension value is stored for accumulation. When the accumulation times reaches the set times, the average value is taken as the new original tension value. When the temperature is less than 2 degrees, no accumulation operation is performed, and the current tension value is used as the original tension value.

[0013] Furthermore, the specific steps of step (4) are:

[0014] S1: If the current temperature is lower than the previous temperature, but the ice coverage value calculated by the ice coverage formula becomes lower, the previous ice coverage monitoring value is used as the ice coverage value after this fusion;

[0015] S2: If the current temperature is higher than the previous temperature and the current temperature is less than 0 degrees, and the current value calculated by the ice covering formula is less than or equal to 0, then the previous ice covering value is multiplied by a weight coefficient as the ice covering value after this fusion;

[0016] S3: If the current temperature is higher than the previous temperature and the current temperature is greater than 0 degrees, and the current value calculated by the ice covering formula is less than or equal to 0, the ice covering value is set to 0 by slowly correcting the ice covering.

[0017] Furthermore, in step S2, if the current temperature is greater than or equal to 1 degree compared to the previous temperature, the current ice thickness = (last ice thickness * 0.95) mm, and the weight coefficient is 0.95 at this time; if the current temperature is less than 1 degree compared to the previous temperature, the current ice thickness = (last ice thickness * 0.98) mm, and the weight coefficient is 0.98 at this time.

[0018] Furthermore, the specific steps of step S3 are: if the last ice covering value is greater than 1 mm, the current ice covering thickness = (last ice covering thickness * 0.5) mm; if the last ice covering value is less than 1 mm, the current ice covering thickness is set to 0 mm.

[0019] Furthermore, in step (3), the ice coverage calculation formula is:

[0020] Where: f w is the wire diameter, f vis the vertical span of the conductor, f is the density of ice, and M is the weight of ice cover. M can be obtained by subtracting the original tension from the current tension.

[0021] More specifically, the number of accumulation times is set to 10 times.

[0022] The beneficial effects of the present invention are as follows: the present invention reads the temperature data in the micro-meteorological sensor. When the temperature is greater than 2 degrees, it is found through a large number of on-site picture observations that there is no ice cover; when the temperature is less than 2 degrees, a number of consecutive tension values ​​are averaged as the new original tension; when the tension sensor is inaccurate in tension oscillation, the current ice cover value is corrected by the temperature change trend and the last ice cover monitoring value; experiments have verified that the method of the present invention can effectively improve the accuracy of ice cover monitoring; by continuously correcting the original tension value, the accuracy of ice cover thickness measurement is significantly improved. The method of the present invention can effectively reduce errors and improve the accuracy of ice cover thickness monitoring values. It is of great significance to improve the operating safety of power systems under severe weather conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a flow chart of the method of the present invention. DETAILED DESCRIPTION

[0024] like Figure 1 As shown, the method of the present invention comprises the following steps:

[0025] (1) A camera, a micro-meteorological sensor, two tension sensors and a section of simulated wire are installed on a transmission line tower. The two tension sensors are arranged at two different positions on the simulated wire. The camera is aimed at the simulated wire. At a set frequency, the micro-meteorological sensor reads temperature data and transmits it back to a backend server. The tension sensor reads tension data and transmits it back to the backend server. The camera captures a clear picture of the simulated wire and transmits it back to the backend server.

[0026] (2) The background server performs original tension correction based on the received temperature data and tension data.

[0027] (3) The backend server calculates the ice thickness of the current simulated conductor based on the corrected original tension data and the newly uploaded tension data using the ice thickness calculation formula; the ice thickness calculation formula is:

[0028]

[0029] Where: f w is the wire diameter, f v is the vertical span of the conductor, f is the density of ice, and M is the weight of ice cover. M can be obtained by subtracting the original tension from the current tension.

[0030] (4) Predict the temperature change trend of the tower, and obtain the final actual conductor icing value through comprehensive analysis based on the temperature change trend, the last simulated conductor icing monitoring value, and the simulated conductor icing value of this monitoring.

[0031] (5) The conductor ice thickness value obtained in step (4) and the conductor ice picture taken by the camera are transmitted back to the background. If the conductor ice thickness reaches the threshold for manual de-icing, personnel are arranged to start the conductor ice melting mechanism; if the conductor ice thickness does not reach the set ice melting threshold, manual marking is performed.

[0032] In the above step (4), specifically, after integrating the temperature and the last ice monitoring value, the pseudo code for the ice monitoring result of this time is obtained comprehensively as follows:

[0033] IF current temperature <= previous temperature AND current temperature <= 0 THEN

[0034] IF the last ice thickness value >= current equivalent ice thickness THEN

[0035] Current equivalent ice thickness = last ice coverage value

[0036] END IF

[0037] END IF

[0038] IF current temperature > previous temperature AND current temperature <= 0 AND current equivalent ice thickness <= 0 THEN

[0039] IF current temperature - last temperature > 1THEN

[0040] Current equivalent ice thickness = last ice coverage value * 0.95

[0041] ELSE

[0042] Current equivalent ice thickness = last ice coverage value * 0.98

[0043] END IF

[0044] END IF

[0045] IF current temperature >= 0 OR current equivalent ice thickness < 0 THEN

[0046] IF the last ice cover value > 1THEN

[0047] Current equivalent ice thickness = last ice coverage value * 0.5

[0048] ELSE

[0049] Current equivalent ice thickness = 0

[0050] END IF

[0051] END IF

[0052] In step (2), the specific steps of performing the original tension correction are:

[0053] The background server reads the temperature data from the micro-meteorological sensor. When the temperature is greater than 2 degrees, the current tension value is stored for accumulation. When the accumulation times reach the set times, the average value is taken as the new original tension value. In this embodiment, the accumulation times are set to 10 times. When the temperature is less than 2 degrees, no accumulation operation is performed, and the current tension value is taken as the original tension value. Specifically, the pseudo code of this step is as follows:

[0054] IF current temperature >= 2THEN

[0055] Accumulated tension correction value + = tension value 1 + tension value 2

[0056] Tension counter += 1

[0057] PRINT "The current accumulated tension value is:", accumulated tension correction value

[0058] IF tension counter = 10THEN

[0059] New tension correction value = accumulated tension correction value / 10

[0060] PRINT"The average tension correction value is:", tension correction value

[0061] Tension counter = 0

[0062] Accumulated tension correction value = 0

[0063] END IF

[0064] END IF

[0065] The specific steps of step (4) are:

[0066] S1. If the current temperature is lower than the previous temperature, but the ice coverage value calculated by the ice coverage formula becomes lower, the last ice coverage monitoring value is used as the ice coverage value after this fusion;

[0067] S2. If the current temperature is higher than the previous temperature and the current temperature is less than 0 degrees, and the current value calculated by the ice covering formula is less than or equal to 0, then the previous ice covering value is multiplied by a weight coefficient as the ice covering value after this fusion; if the current temperature is greater than or equal to 1 degree than the previous temperature, then the ice covering thickness of this time = (the ice covering thickness of the last time * 0.95) mm, at this time, the weight coefficient is 0.95; if the current temperature is less than 1 degree than the previous temperature, then the ice covering thickness of this time = (the ice covering thickness of the last time * 0.98) mm, at this time, the weight coefficient is 0.98.

[0068] S3. If the current temperature is higher than the previous temperature and the current temperature is greater than 0 degrees, and the current value calculated by the ice covering formula is less than or equal to 0, the ice covering value is set to 0 by slowly correcting the ice covering value; if the previous ice covering value is greater than 1mm, the current ice covering thickness = (last ice covering thickness * 0.5) mm; if the last ice covering value is less than 1mm, the current ice covering thickness is set to 0mm.

[0069] The present invention introduces a tension correction technology based on the temperature change trend, uses a simulated wire for testing, reflects the ice coverage of the real wire, improves the safety of operation, and significantly improves the accuracy and reliability of ice thickness monitoring of transmission wires. The tension correction method based on temperature adjustment can effectively offset the impact of temperature changes, and when the tension sensor oscillates inaccurately, the correction algorithm based on the temperature and the last ice coverage monitoring value further ensures the accuracy of the ice coverage monitoring value. These innovations are of great value in improving the safety and stability of power systems under adverse weather conditions.

[0070] Finally, it should be emphasized that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various changes and modifications. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A wire ice monitoring method based on tension correction, characterized in that: The method comprises the following steps: (1) A camera, a micro-meteorological sensor, two tension sensors and a section of simulated wire are installed on a transmission line tower, wherein the two tension sensors are arranged at two different positions on the simulated wire, wherein the camera is aimed at the simulated wire, and at a set frequency, the micro-meteorological sensor reads temperature data and transmits it back to a backend server, the tension sensor reads tension data and transmits it back to the backend server, and the camera captures a clear picture of the simulated wire and transmits it back to the backend server; (2) the backend server performs original tension correction according to the received temperature data and tension data; (3) The backend server calculates the current simulated conductor ice thickness based on the corrected original tension data and the newly uploaded tension data using the ice thickness calculation formula; (4) Predict the temperature change trend of the tower, and obtain the final actual conductor icing value by comprehensive analysis based on the temperature change trend, the last simulated conductor icing monitoring value, and the simulated conductor icing value of this monitoring; (5) The conductor ice thickness value obtained in step (4) and the conductor ice picture taken by the camera are transmitted back to the background. If the ice thickness reaches the threshold for manual de-icing, personnel are arranged to start the conductor ice melting mechanism; if the conductor ice thickness does not reach the set ice melting threshold, manual marking is performed.

2. A wire ice monitoring method based on tension correction according to claim 1, characterized in that: In step (2), the specific steps of performing the original tension correction are: The background server reads the temperature data from the micro-meteorological sensor. When the temperature is greater than 2 degrees, the current tension value is stored for accumulation. When the accumulation times reaches the set times, the average value is taken as the new original tension value. When the temperature is less than 2 degrees, no accumulation operation is performed, and the current tension value is used as the original tension value.

3. The wire ice monitoring method based on tension correction according to claim 1 is characterized in that: The specific steps of step (4) are: S1. If the current temperature is lower than the previous temperature, but the ice coverage value calculated by the ice coverage formula becomes lower, the last ice coverage monitoring value is used as the ice coverage value after this fusion; S2. If the current temperature is higher than the previous temperature and the current temperature is less than 0 degrees, and the current value calculated by the ice covering formula is less than or equal to 0, then the previous ice covering value is multiplied by a weight coefficient as the ice covering value after this fusion; S3. If the current temperature is higher than the previous temperature and the current temperature is greater than 0 degrees, and the current value calculated by the ice covering formula is less than or equal to 0, the ice covering value is set to 0 by slowly correcting the ice covering.

4. The wire ice monitoring method based on tension correction according to claim 3 is characterized in that: In step S2, if the current temperature is greater than or equal to 1 degree higher than the previous temperature, the current ice thickness = (last ice thickness * 0.95) mm, and the weight coefficient is 0.95 at this time; if the current temperature is less than 1 degree higher than the previous temperature, the current ice thickness = (last ice thickness * 0.98) mm, and the weight coefficient is 0.98 at this time.

5. The wire ice monitoring method based on tension correction according to claim 3 is characterized in that: The specific steps of step S3 are: if the last ice covering value is greater than 1 mm, then the current ice covering thickness = (last ice covering thickness * 0.5) mm; If the last ice coverage value is less than 1mm, the ice coverage thickness this time will be set to 0mm.

6. The wire ice monitoring method based on tension correction according to claim 1 is characterized in that: In step (3), the ice coverage calculation formula is: Where: f w is the wire diameter, f v is the vertical span of the conductor, f is the density of ice, and M is the weight of ice cover. M can be obtained by subtracting the original tension from the current tension.

7. The wire ice monitoring method based on tension correction according to claim 2 is characterized in that: The cumulative number of times is set to 10 times.

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