A real-time monitoring method and system for the inclination of a power transmission tower under the action of stable wind

Abstract

The application discloses a kind of real-time monitoring method and system of transmission tower tilt under the action of stable wind field, it is related to transmission tower monitoring technical field, its technical solution key points are: the fitting function between each axial vibration component and corresponding axial wind speed component is established;Real-time wind speed and real-time vibration data of target tower are obtained;Select the highest matching degree of historical wind speed as reference wind speed with real-time wind speed, and extract the corresponding reference vibration data;Theoretical vibration deviation of each axial is calculated;According to reference vibration data and real-time vibration data, the actual vibration deviation of each axial is determined;If there is the case that actual vibration deviation does not comply with the judgment logic of theoretical vibration deviation, then output early warning signal indicating that target tower is in tilt deformation.When transmission tower is in dynamic change tilt state after the action of wind speed, the application can also be accurately monitored, and real-time early warning can be carried out in the wind-induced vibration process of transmission tower.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of transmission tower monitoring, more particularly, it relates to a transmission tower inclination real-time monitoring method and system under stable wind field action. BACKGROUND

[0002] Transmission tower inclination is mainly caused by the overall inclination of the tower or the deformation and inclination of the partial structure due to factors such as loose tower foundation and severe weather. Since the position of the transmission tower carrying the transmission line is relatively high, under the action of a large wind field, the upper end of the transmission tower is prone to large amplitude shaking. The transmission towers at both ends of the transmission line are prone to cause the transmission line to break during the large amplitude shaking process. The transmission line is more prone to breakage after the transmission tower inclines. Therefore, monitoring the state of the transmission tower is beneficial to timely maintenance and emergency disposal for the safe operation of the transmission tower.

[0003] At present, for the transmission tower inclination caused by the static environment, such as the transmission tower inclination caused by the loose tower foundation, the inclination state of the transmission tower can be monitored by the inclination angle sensor. However, for the transmission tower inclination caused by the dynamic environment, such as wind-induced vibration, the transmission tower will shake under the action of the wind field, and the inclination angle and inclination direction are different under the influence of different wind fields. Therefore, the inclination state of the transmission tower cannot be directly judged by the angle value collected by the inclination angle sensor, whether it is self-inclination or wind-induced vibration.

[0004] Therefore, how to research and design a transmission tower inclination real-time monitoring method and system that can overcome the above defects is a problem we need to solve at present. SUMMARY

[0005] To solve the problems in the prior art, the purpose of the present application is to provide a transmission tower inclination real-time monitoring method and system under stable wind field action, which can accurately monitor when the transmission tower is in a dynamic change inclination state after the action of the wind speed, and can perform real-time early warning when the transmission tower is in the process of wind-induced vibration.

[0006] The above technical purpose of the present application is achieved by the following technical scheme:

[0007] In a first aspect, a transmission tower inclination real-time monitoring method under stable wind field action is provided, comprising the following steps:

[0008] A three-dimensional coordinate system is established with the target tower as the origin, and a fitting function between each axial vibration component and the corresponding axial wind speed component is established according to the historical vibration data of the target tower under the action of different wind speeds;

[0009] Real-time wind speed and real-time vibration data of the target tower are obtained;

[0010] selecting a historical wind speed with the highest matching degree from the historical database as a reference wind speed, and extracting historical vibration data corresponding to the reference wind speed as reference vibration data;

[0011] calculating a theoretical vibration deviation of each axial direction according to the fitting function, the historical wind speed and the real-time wind speed;

[0012] determining an actual vibration deviation of each axial direction according to the reference vibration data and the real-time vibration data;

[0013] performing logical judgment on the actual vibration deviation of each axial direction and the theoretical vibration deviation of each axial direction, and outputting a warning signal representing that the target tower is in a tilting deformation if there is a case that the actual vibration deviation does not conform to the judgment logic of the theoretical vibration deviation.

[0014] Further, the establishment process of the fitting function is specifically:

[0015] decomposing the wind speed acting on the target tower into axial wind speed components of each axial direction of a three-dimensional coordinate system;

[0016] extracting axial vibration components of each axial direction of the three-dimensional coordinate system from the historical vibration data;

[0017] fitting the axial vibration components and the corresponding axial wind speed components to obtain a fitting function with the axial wind speed components as the horizontal coordinates and the axial vibration components as the vertical coordinates.

[0018] Further, the axial vibration component adopts the maximum vibration amplitude, and the expression of the fitting function is:

[0019]

[0020] wherein, represents the maximum vibration amplitude of the target tower in the axial direction i under the action of the wind speed v; f i represents the fitting function of the vibration amplitude and the wind speed in the axial direction i; v i represents the axial wind speed component of the wind speed v in the axial direction i; x, y and z represent the three axial directions of the three-dimensional coordinate system.

[0021] Further, the axial vibration component adopts the maximum acceleration.

[0022] Further, the matching degree is determined by the sampling time interval between the real-time wind speed and the historical wind speed, the spatial angle between the real-time wind speed and the historical wind speed in the three-dimensional coordinate system, and the wind speed size difference between the real-time wind speed and the historical wind speed.

[0023] Further, the calculation formula of the matching degree is specifically:

[0024] P = f(t)f(θ)f(v)

[0025]

[0026]

[0027]

[0028] Where P represents the matching degree between real-time wind speed and historical wind speed; f(t) represents the time matching function determined by the sampling time interval; T0 represents the preset maximum sampling time interval; Δt represents the sampling time interval between real-time wind speed and historical wind speed; f(θ) represents the angle matching function determined by the spatial angle; θ represents the spatial angle between real-time wind speed and historical wind speed in the three-dimensional coordinate system; f(v) represents the wind speed matching function determined by the difference in wind speed magnitude; |v c | Represents historical wind speed v c Size; |v s | Represents real-time wind speed v s Size.

[0029] Furthermore, the expression for the logical judgment is specifically as follows:

[0030]

[0031] in, L represents the theoretical vibration deviation between the real-time wind speed and the reference wind speed along the axial direction i; i,w This represents the permissible vibration error along the axial direction i; This represents the actual vibration deviation between the real-time vibration data and the reference vibration data along the axial direction i.

[0032] Secondly, a real-time monitoring system for the tilt of transmission towers under stable wind conditions is provided, including:

[0033] The function fitting module establishes a three-dimensional coordinate system with the target tower as the origin, and establishes fitting functions between each axial vibration component and the corresponding axial wind speed component based on the historical vibration data of the target tower under different wind speeds.

[0034] The data acquisition module is used to acquire real-time wind speed and vibration data of the target tower.

[0035] The wind speed matching module is used to select the historical wind speed with the highest matching degree with the real-time wind speed from the historical database as the reference wind speed, and extract the historical vibration data corresponding to the reference wind speed as the reference vibration data.

[0036] The theoretical calculation module is used to calculate the theoretical vibration deviation of each axis by combining the fitting function of each axis, historical wind speed and real-time wind speed.

[0037] an actual analysis module, configured to determine actual vibration deviations of each axial direction according to the reference vibration data and the real-time vibration data;

[0038] a logical judgment module, configured to perform logical judgment on the actual vibration deviations of each axial direction and the theoretical vibration deviations of each axial direction, and output a pre-warning signal indicating that the target tower is in a tilting deformation state if there is a case that the actual vibration deviations do not conform to the judgment logic of the theoretical vibration deviations.

[0039] In a third aspect, a computer terminal is provided, which comprises a memory, a processor and a computer program stored in the memory and executable on the processor, and the processor implements the method for monitoring the tilting of a power transmission tower in a stable wind field in real time according to any one of the first aspect.

[0040] In a fourth aspect, a computer readable medium is provided, which stores a computer program, and the computer program is executable by a processor to implement the method for monitoring the tilting of a power transmission tower in a stable wind field in real time according to any one of the first aspect.

[0041] Compared with the prior art, the present application has the following beneficial effects:

[0042] 1. The method for monitoring the tilting of a power transmission tower in a stable wind field in real time provided by the present application can analyze the actual vibration differences and the alternate vibration differences of the power transmission tower under the action of different wind speeds, compare the actual vibration differences with the alternate vibration differences, judge whether the power transmission tower is in a tilting state caused by its own structural deformation or damage, and accurately monitor the tilting state of the power transmission tower when the power transmission tower is in a dynamic tilting state after being acted on by wind, and can perform real-time pre-warning when the power transmission tower is in a wind-induced vibration process.

[0043] 2. When analyzing the matching degree between the real-time wind speed and the historical wind speed, the present application comprehensively considers the sampling time interval, the spatial angle and the wind speed size difference, so as to reduce the influence of external factors such as the overhead line and the attachments on the power transmission tower on the monitoring accuracy, and reduce the influence of the vibration response deviation of the power transmission tower under the action of different wind speeds on the monitoring accuracy.

[0044] 3. The present application is suitable for a wind field in which the wind speed size and / or the wind speed direction change rate is small, and can meet the universality requirement of real-time monitoring of a large number of power transmission towers in a power grid. DETAILED DESCRIPTION

[0045] The accompanying drawings, which are included to provide a further understanding of the embodiments of the present application and constitute a part of the application, do not limit the embodiments of the present application. In the drawings:

[0046] Figure 1is a flow chart in embodiment 1 of the present application;

[0047] Figure 2 is a system block diagram in embodiment 2 of the present application. DETAILED DESCRIPTION

[0048] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application is further described in detail below with embodiments and drawings, the illustrative embodiments of the present application and their descriptions are only used to explain the present application, and do not limit the present application.

[0049] Embodiment 1: A real-time monitoring method for stabilizing the inclination of a power transmission tower under the action of wind, as shown in Figure 1 , comprising the following steps:

[0050] S1: Establishing a three-dimensional coordinate system with the target tower as the origin, and establishing a fitting function between each axial vibration component and the corresponding axial wind speed component according to the historical vibration data of the target tower under the action of different wind speeds;

[0051] S2: Obtaining real-time wind speed and real-time vibration data of the target tower;

[0052] S3: Selecting the historical wind speed with the highest matching degree with the real-time wind speed from the historical database as the reference wind speed, and extracting the historical vibration data corresponding to the reference wind speed as the reference vibration data;

[0053] S4: Calculating the theoretical vibration deviation of each axis by combining the fitting function of each axis, the historical wind speed and the real-time wind speed;

[0054] S5: Determining the actual vibration deviation of each axis according to the reference vibration data and the real-time vibration data;

[0055] S6: Making logical judgment on the actual vibration deviation of each axis and the theoretical vibration deviation of each axis, if there is a case that the actual vibration deviation does not conform to the judgment logic of the theoretical vibration deviation, outputting a warning signal representing that the target tower is in inclination deformation.

[0056] The establishment process of the fitting function is as follows: decomposing the wind speed acting on the target tower into axial wind speed components in each axis of the three-dimensional coordinate system; extracting axial vibration components in each axis of the three-dimensional coordinate system from the historical vibration data; fitting the axial vibration components with the corresponding axial wind speed components to obtain a fitting function with the axial wind speed components as the horizontal coordinates and the axial vibration components as the vertical coordinates. The fitting function can be a linear function or a nonlinear function, for example, a curve function fitting by using the least square method.

[0057] It should be noted that the historical vibration data can be measured by a vibration sensor to measure the vibration amplitude, and then the maximum vibration amplitude is selected as the historical vibration data; in addition, an acceleration sensor can also be used to measure the vibration acceleration.

[0058] For example, the axial vibration component adopts the maximum vibration amplitude, and the expression of the fitting function is:

[0059]

[0060] wherein, represents the maximum vibration amplitude of the target tower in the axial direction i under the action of the wind speed v; f i represents the fitting function of the vibration amplitude and the wind speed in the axial direction i; v i represents the axial wind speed component of the wind speed v in the axial direction i; x, y, z represent the three axial directions of the three-dimensional coordinate system.

[0061] For another example, the axial vibration component adopts the maximum acceleration, and in addition, the maximum vibration amplitude and the maximum acceleration can also be converted to each other.

[0062] The matching degree is determined by the sampling time interval between the real-time wind speed and the historical wind speed, the spatial angle between the real-time wind speed and the historical wind speed in the three-dimensional coordinate system, and the wind speed size difference between the real-time wind speed and the historical wind speed, that is, the influence of external factors such as attachments on overhead lines and transmission towers on monitoring accuracy can be reduced, and the influence of the vibration response deviation of the transmission tower under the action of different wind speeds on the monitoring accuracy can also be reduced.

[0063] For example, the calculation formula of the matching degree is specifically:

[0064] P=f(t)f(θ)f(v)

[0065]

[0066]

[0067]

[0068] wherein, P represents the matching degree between the real-time wind speed and the historical wind speed; f(t) represents a time matching function determined by the sampling time interval; T0 represents a preset maximum sampling time interval; Δt represents the sampling time interval between the real-time wind speed and the historical wind speed; f(θ) represents an angle matching function determined by the spatial angle; θ represents the spatial angle between the real-time wind speed and the historical wind speed in the three-dimensional coordinate system; f(v) represents a wind speed matching function determined by the wind speed size difference; |v c | represents the size of the historical wind speed v c ; |v s | represents the size of the real-time wind speed vs the size of the target tower.

[0069] The expression of logical judgment is specifically:

[0070]

[0071] wherein, represents the theoretical vibration deviation of real-time wind speed and reference wind speed in the axial direction i; L i,w represents the allowed vibration deviation in the axial direction i; represents the actual vibration deviation of real-time vibration data and reference vibration data in the axial direction i.

[0072] It should be noted that the allowed vibration deviation in the axial direction can be adaptively adjusted according to the monitoring sensitivity, and the vibration deviations corresponding to the upper limit value and the lower limit value can also be different.

[0073] Embodiment 2: A real-time monitoring system for the inclination of a power transmission tower under the action of stable wind, which is used to realize the real-time monitoring method for the inclination of a power transmission tower under the action of stable wind as recorded in Embodiment 1, as shown in Figure 2 The system includes a function fitting module, a data acquisition module, a wind speed matching module, a theoretical calculation module, an actual analysis module, and a logical judgment module.

[0074] The function fitting module establishes a three-dimensional coordinate system with the target tower as the origin, and establishes a fitting function between the vibration component of each axial direction and the corresponding axial wind speed component according to the historical vibration data of the target tower under the action of different wind speeds. The data acquisition module is used to obtain the real-time wind speed and real-time vibration data of the target tower. The wind speed matching module is used to select the historical wind speed with the highest matching degree with the real-time wind speed from the historical database as the reference wind speed, and extract the historical vibration data corresponding to the reference wind speed as the reference vibration data. The theoretical calculation module is used to calculate the theoretical vibration deviation of each axial direction in combination with the fitting function of each axial direction, the historical wind speed, and the real-time wind speed. The actual analysis module is used to determine the actual vibration deviation of each axial direction according to the reference vibration data and the real-time vibration data. The logical judgment module is used to logically judge the actual vibration deviation of each axial direction and the theoretical vibration deviation of each axial direction. If there is a case that the actual vibration deviation does not conform to the judgment logic of the theoretical vibration deviation, an early warning signal indicating that the target tower is in inclination deformation is output.

[0075] Working principle: the actual vibration difference and the turn vibration difference of the power transmission tower under the action of different wind speeds are analyzed, and the actual vibration difference is compared with the turn vibration difference, whether the power transmission tower is in the tilting state caused by the structural deformation or damage of the power transmission tower is judged, when the power transmission tower is in the dynamic change tilting state after the action of the wind speed, it can also be accurately monitored, and real-time early warning can be carried out in the wind-induced vibration process of the power transmission tower.

[0076] The above specific embodiments further illustrate the purpose, technical scheme and beneficial effects of the present application. It should be understood that the above description is only a specific embodiment of the present application and is not used to limit the protection scope of the present application. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A method for real-time monitoring of the tilt of transmission towers under stable wind fields, characterized in that, Includes the following steps: A three-dimensional coordinate system is established with the target tower as the origin, and a fitting function between each axial vibration component and the corresponding axial wind speed component is established based on the historical vibration data of the target tower under different wind speeds. Acquire real-time wind speed and vibration data of the target tower; The historical wind speed with the highest matching degree with the real-time wind speed is selected from the historical database as the reference wind speed, and the historical vibration data corresponding to the reference wind speed is extracted as the reference vibration data. The theoretical vibration deviation for each axis is calculated by combining the fitting function of each axis, historical wind speed and real-time wind speed. The actual vibration deviation of each axis is determined based on reference vibration data and real-time vibration data; The actual vibration deviation of each axis is logically judged against the theoretical vibration deviation of each axis. If there is a case where the actual vibration deviation does not conform to the judgment logic of the theoretical vibration deviation, an early warning signal indicating that the target tower is in tilting deformation is output. The matching degree is determined by the sampling time interval between real-time wind speed and historical wind speed, the spatial angle between real-time wind speed and historical wind speed in the three-dimensional coordinate system, and the difference in wind speed between real-time wind speed and historical wind speed. The specific formula for calculating the matching degree is as follows: P = f(t)f(θ)f(v) Where P represents the matching degree between real-time wind speed and historical wind speed; f(t) represents the time matching function determined by the sampling time interval; T0 represents the preset maximum sampling time interval; Δt represents the sampling time interval between real-time wind speed and historical wind speed; f(θ) represents the angle matching function determined by the spatial angle; θ represents the spatial angle between real-time wind speed and historical wind speed in the three-dimensional coordinate system; f(v) represents the wind speed matching function determined by the difference in wind speed magnitude; |v c | Represents historical wind speed v c Size; |v s | Represents real-time wind speed v s Size.

2. The method for real-time monitoring of transmission tower tilt under stable wind field conditions according to claim 1, characterized in that, The process of establishing the fitting function is as follows: The wind speed acting on the target tower is decomposed into axial wind speed components along each axis of the three-dimensional coordinate system. Extract axial vibration components in each axis of the three-dimensional coordinate system from historical vibration data; A fitting function is obtained by fitting the axial vibration component with the corresponding axial wind speed component, with the axial wind speed component as the abscissa and the axial vibration component as the ordinate.

3. The method for real-time monitoring of transmission tower tilt under stable wind field conditions according to claim 2, characterized in that, The axial vibration component uses the maximum vibration amplitude, and the expression of the fitting function is: in, f represents the maximum vibration amplitude of the target tower along axis i under wind speed v; i (·) represents the fitting function of vibration amplitude and wind speed along axis i; v i The axial wind speed component of wind speed v along axis i is represented; x, y, and z represent the three axial directions of the three-dimensional coordinate system.

4. The method for real-time monitoring of transmission tower tilt under stable wind field conditions according to claim 2, characterized in that, The axial vibration component is based on the maximum acceleration.

5. The method for real-time monitoring of transmission tower tilt under stable wind field conditions according to claim 1, characterized in that, The expression for the logical judgment is as follows: in, L represents the theoretical vibration deviation between the real-time wind speed and the reference wind speed along the axial direction i; i,w This represents the permissible vibration error along the axial direction i; This represents the actual vibration deviation between the real-time vibration data and the reference vibration data along the axial direction i.

6. A real-time monitoring system for the tilt of transmission towers under stable wind fields, characterized in that, This system is used to implement a real-time monitoring method for the tilt of transmission towers under stable wind conditions as described in any one of claims 1-5, comprising: The function fitting module establishes a three-dimensional coordinate system with the target tower as the origin, and establishes fitting functions between each axial vibration component and the corresponding axial wind speed component based on the historical vibration data of the target tower under different wind speeds. The data acquisition module is used to acquire real-time wind speed and vibration data of the target tower. The wind speed matching module is used to select the historical wind speed with the highest matching degree with the real-time wind speed from the historical database as the reference wind speed, and extract the historical vibration data corresponding to the reference wind speed as the reference vibration data. The theoretical calculation module is used to calculate the theoretical vibration deviation of each axis by combining the fitting function of each axis, historical wind speed and real-time wind speed. The actual analysis module is used to determine the actual vibration deviation of each axis based on reference vibration data and real-time vibration data; The logic judgment module is used to make a logical judgment between the actual vibration deviation of each axis and the theoretical vibration deviation of each axis. If there is a case where the actual vibration deviation does not conform to the judgment logic of the theoretical vibration deviation, an early warning signal indicating that the target tower is in tilt deformation will be output.

7. A computer terminal comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the program, it implements a method for real-time monitoring of the tilt of transmission towers under stable wind conditions as described in any one of claims 1-5.

8. A computer-readable medium having a computer program stored thereon, characterized in that, The computer program, when executed by a processor, can realize a real-time monitoring method for the tilt of transmission towers under stable wind conditions as described in any one of claims 1-5.

Images