Device and method for studying tower stress deformation and wind response

Abstract

The present invention discloses a device and method for studying the stress deformation and wind response of a tower. The device includes an equipment box, which is respectively arranged on a number of iron towers. A power supply component is arranged on the equipment box, and a signal processing component is arranged inside the equipment box. The power supply component is electrically connected to the signal processing component, and the signal processing component is communicatively connected to a monitoring center, and the monitoring center is communicatively connected to a mobile terminal. A number of fiber Bragg grating stress sensors for monitoring the stress changes in different parts of the iron tower are arranged on the iron tower, and an auxiliary monitoring component for comprehensively judging the state of the iron tower by combining the stress changes in different parts is also arranged on the iron tower. By arranging fiber Bragg grating stress sensors at key parts of the iron tower to monitor the stress change values in real time, and at the same time transmitting various data to the monitoring center in real time, the operating condition of the iron tower is analyzed according to the current iron tower model and operating parameters, so as to realize the real-time monitoring of the safety state of the iron tower efficiently and accurately.

Description

Technical Field

[0001] The present invention relates to the technical field of transmission line tower status monitoring, and particularly to a device and method for researching tower stress deformation and wind response. Background Art

[0002] Transmission lines are not only extremely critical facilities in the power grid system but also the main arteries for the safe and reliable operation of the power grid. Among them, transmission towers play an important supporting role for conductors and ground wires, and the safety of towers is the basis for the reliable operation of the power grid. However, with the increase in the scale of the power grid and the improvement of the line voltage level, the operating conditions of the power grid will become more complex. Transmission towers often operate under harsh conditions such as icing, wind load, and conductor galloping, which are extremely likely to cause faults such as tower body inclination, tower foundation settlement, and tower member deformation. Tower faults are typical "invisible faults". During normal manual inspections of transmission lines, they are often not detected in time. When tower faults are discovered, the transmission line is already in a dangerous state, seriously threatening the reliable operation of the line.

[0003] Currently, the most widely used in the safety monitoring of transmission towers is the on-line monitoring system for the inclination of transmission towers designed based on inclination sensors. By collecting the inclination angles of the tower in the line direction and the cross direction, a tower inclination model is established, and the inclination degrees of the tower in the cross direction and the line direction as well as the comprehensive inclination degree are calculated. By obtaining the tower inclination information, although it can predict the safety state of the tower to a certain extent, the accuracy of the tower inclination state obtained only through inclination sensors is relatively low, and there are certain errors in predicting the safety state of the tower, which is not conducive to the overall line scheduling and maintenance plan arrangement. Summary of the Invention

[0004] Aiming at the technical problem that currently only using inclination sensors to monitor the inclination of transmission towers to judge the tower inclination state has relatively low accuracy and there are certain errors in predicting the safety state of the tower, the present application discloses a device and method for researching tower stress deformation and wind response.

[0005] The present invention realizes the above object through the following technical solutions:

[0006] This application proposes a research device for tower stress deformation and wind response, including an equipment box, which is respectively arranged on several iron towers. A power supply component is arranged on the equipment box, and a signal processing component is arranged inside the equipment box. The power supply component is electrically connected to the signal processing component, the signal processing component is communicatively connected to a monitoring center, and the monitoring center is communicatively connected to a mobile terminal. A number of fiber Bragg grating stress sensors for monitoring stress changes in different parts of the iron tower are arranged on the iron tower. An auxiliary monitoring component for comprehensively judging the state of the iron tower by combining stress changes in different parts is also arranged on the iron tower. Both the fiber Bragg grating stress sensors and the auxiliary monitoring component are electrically connected to the signal processing component.

[0007] Preferably, the power supply component includes a solar panel, an MPPT controller, a PWM controller, a current converter, and a storage battery. The solar panel is electrically connected to the current converter, the current converter is electrically connected to the storage battery, the storage battery is electrically connected to the signal processing component, the MPPT controller is electrically connected to the output side of the solar panel, the MPPT controller is electrically connected to the PWM controller, and the PWM controller is electrically connected to the current converter.

[0008] Preferably, the signal processing component includes a fiber Bragg grating demodulator and a stress state monitor. The fiber Bragg grating demodulator is electrically connected to the fiber Bragg grating stress sensors, the fiber Bragg grating demodulator is electrically connected to the stress state monitor, and the stress state monitor is communicatively connected to the monitoring center through an optical fiber. The stress state monitor is electrically connected to the auxiliary monitoring component.

[0009] Preferably, the auxiliary monitoring component includes a micro-meteorological sensor, which is arranged on the iron tower. The micro-meteorological sensor is electrically connected to the stress state monitor through an RS485 communication bus.

[0010] Preferably, the auxiliary monitoring component includes an inclination sensor, which is arranged on the iron tower. The inclination sensor is electrically connected to the stress state monitor through an RS485 communication bus.

[0011] Preferably, the auxiliary monitoring component includes an infrared thermal imaging camera, which is arranged on the iron tower. The infrared thermal imaging camera is electrically connected to the stress state monitor.

[0012] This application also proposes a research method for tower stress deformation and wind response, including the following steps:

[0013] S1. Establish a finite element model of the tower-line system and determine the distribution of key members of the iron tower;

[0014] S2. Establish a failure tower database based on the data of tower collapses or damaged towers over the years;

[0015] S3. Calculate the parameters of the tower and guy wires under the limit of wind load according to the failure tower database, combined with the current transmission line design standards and the wind resistance design grades of transmission towers;

[0016] S4. Obtain the limit effect of the tower under the action of wind and the boundary conditions of damage according to the parameters of the tower and guy wires under the limit of wind load;

[0017] S5. Obtain the stress change parameters at different positions of the iron tower;

[0018] S6. Judge the state of the iron tower according to the stress change parameters at different positions of the iron tower, combined with the finite element model of the tower-line system and the limit effect of the tower under the action of wind and the boundary conditions of damage.

[0019] Preferably, the method for obtaining the stress change parameters in step S5 includes installing fiber Bragg grating stress sensors at the key member parts of the iron tower and using the fiber Bragg grating stress sensors to obtain the stress change values at the fixed installation positions.

[0020] Compared with the prior art, the beneficial effects are as follows:

[0021] 1. By arranging fiber Bragg grating stress sensors at the key parts of the iron tower to monitor the stress change values in real time, and at the same time transmitting various data to the monitoring center in real time, analyzing the operating conditions of the iron tower according to the current iron tower model and operating parameters, so as to efficiently and accurately realize the real-time monitoring of the safety state of the iron tower;

[0022] 2. By real-time monitoring of the stress parameters of the line iron tower, and through the remote 4G communication method, transmitting the data to the monitoring center in real time remotely, and combining the line transmission capacity transmitted from the power grid main station system, conducting dynamic health data analysis of the line, providing scientific measurement values for line dispatching personnel, which can not only enable system operators to seize the opportunity to improve the transmission capacity of the line during peak power consumption, but also avoid unnecessary load reduction operations in case of unexpected situations. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0024] Figure 1 It is the overall working principle block diagram of the present invention.

[0025] Figure 2 It is a work flow chart of the present invention.

[0026] The following are the descriptions of the reference numerals: DETAILED DESCRIPTION

[0027] The following is combined with Figure 1-2 , the technical solution of the present invention is further explained:

[0028] Embodiment 1

[0029] like Figure 1 As shown, the present application discloses a research device for pole tower profit deformation and wind response, including an equipment box, which is respectively arranged on several iron towers, and a power supply component is arranged on the equipment box, and the power supply component includes a solar panel, an MPPT controller, a PWM controller, a current converter and a battery. The solar panel is electrically connected to the current converter, the current converter is electrically connected to the battery, the battery is electrically connected to the signal processing component, the MPPT controller is electrically connected to the outgoing line side of the solar panel, the MPPT controller is electrically connected to the PWM controller, and the PWM controller is electrically connected to the current converter. That is to say, the power supply component is used to provide power for the entire device, wherein solar energy is converted into electrical energy and stored in batteries through solar panels and current converters. At the same time, the power supply component is also equipped with an MPPT controller and a PWM controller. The MPPT controller is a maximum power point tracking controller, which is a core technology in photovoltaic power generation systems. It can adjust the output power of the photovoltaic array according to different external ambient temperatures, light intensity and other characteristics, so that the photovoltaic array always outputs maximum power. When working, the MPPT controller continuously detects the current and voltage changes of the photovoltaic array, and adjusts the duty cycle of the PWM controller drive signal of the current converter according to the changes.

[0030] The device box is provided with a signal processing component, the power supply component is electrically connected to the signal processing component, the signal processing component is connected to the monitoring center for communication, and the monitoring center is connected to the mobile terminal for communication; the iron tower is provided with a number of fiber grating stress sensors for monitoring stress changes in different parts of the iron tower, the signal processing component includes a fiber grating demodulator and a stress state monitor, the fiber grating demodulator is electrically connected to the fiber grating stress sensor, the fiber grating demodulator is electrically connected to the stress state monitor, and the stress state monitor is connected to the monitoring center for communication via optical fiber; the stress state monitor is electrically connected to the auxiliary monitoring component. In other words, the fiber grating demodulator is used to receive the stress signal fed back by the fiber grating stress sensor in real time, the fiber grating demodulator forwards the demodulated stress signal to the stress state monitor, and the stress state monitor transmits the monitoring data remotely to the monitoring center via optical fiber.

[0031] An auxiliary monitoring component for comprehensively judging the state of the iron tower by combining stress changes in different parts is also arranged on the iron tower. The fiber grating stress sensor and the auxiliary monitoring component are both electrically connected to the signal processing component. The auxiliary monitoring component includes a micro-meteorological sensor. The micro-meteorological sensor is arranged on the iron tower and is electrically connected to the stress state monitor through an RS485 communication bus. That is to say, a six-parameter micro-meteorological sensor is also arranged on the iron tower. The micro-meteorological sensor can be used to monitor environmental temperature, humidity, wind speed, wind direction, pressure, and rainfall parameters around the iron tower, facilitating the provision of a large amount of data support for subsequent construction of the iron tower model.

[0032] In some embodiments, the auxiliary monitoring component includes an inclination sensor. The inclination sensor is arranged on the iron tower and is electrically connected to the stress state monitor through an RS485 communication bus. That is to say, an inclination sensor is also arranged on the iron tower. The inclination sensor can be used to more intuitively obtain the inclination state of the iron tower. At the same time, the obtained inclination parameters can be combined with stress parameters to comprehensively analyze and judge the safety state of the iron tower, avoiding a large error in a single state quantity.

[0033] In some embodiments, the auxiliary monitoring component includes an infrared thermal imaging camera. The infrared thermal imaging camera is arranged on the iron tower, and the infrared thermal imaging camera is electrically connected to the stress state monitor. That is to say, an infrared thermal imaging camera is also arranged on the iron tower. The infrared thermal imaging camera is used to obtain the infrared image of the iron tower, facilitating the modification and construction of the iron tower model on the basis of existing inclination parameters and stress parameters, and improving the accuracy of the iron tower model.

[0034] Embodiment 2

[0035] As Figure 2 shown, the present application also discloses a research method for tower stress deformation and wind response, including the following steps:

[0036] S1. Establish a finite element model of the tower-line system to determine the distribution of key members of the iron tower. That is to say, first establish a finite element model of the tower-line system through ANSYS software, study the stress characteristics of the transmission iron tower under different working conditions, and then the distribution of key members of the iron tower can be determined.

[0037] S2. Establish a database of faulty towers according to the data of fallen or damaged towers in previous years; that is to say, establish a database on different wind speed, wind direction, and comprehensive load according to the critical state parameters of fallen or damaged towers in recent years, study the data tables of different height positions, wind speed, wind direction, and comprehensive load, and for the data tables.

[0038] S3. Based on the faulty tower database, combined with the current transmission line design standards and the wind-resistant design grades of transmission towers, calculate the parameters of the tower and guy wires under the limit of wind load. That is to say, according to the critical parameter values of the faulty towers and combined with the wind-resistant grades of the existing transmission lines and transmission towers, calculate the force values on the towers under the limit state and the guy wire parameters; currently, the wind load of transmission towers is considered by multiplying the static wind load by a wind pressure adjustment coefficient, and the wind pressure adjustment coefficient is calculated by Equation (1):

[0039] (1)

[0040] In the formula, ξ is the pulsation amplification coefficient; ν is the pulsation influence coefficient; ϕ z is the mode shape coefficient; μ z is the wind pressure height change coefficient. Except for the pulsation amplification coefficient ξ, the other three coefficients are determined by the external dimensions of the tower. And to obtain ξ, the natural vibration period of the structure needs to be obtained. Usually, the natural vibration period of the tower is obtained according to empirical formulas. For towers with a height exceeding 60 m such as long-span and UHV towers, their natural vibration frequencies are close to the frequencies of pulsating wind and are prone to resonance, and more accurate natural vibration periods are required to determine the wind pressure adjustment coefficient.

[0041] S4. According to the parameters of the tower and guy wires under the limit of wind load, obtain the limit effect of the tower under the action of wind and the damaged boundary conditions; that is to say, calculate the relationship between the force on the tower and the wind force under different wind speeds and wind directions as shown in Table 1:

[0042]

[0043] According to the table of the relationship between the force on the tower and the wind force, the limit effect of the damaged tower, the boundary wind speed, wind direction, and load values can be obtained.

[0044] S5. Obtain the stress change parameters at different positions of the iron tower. The method for obtaining the stress change parameters includes installing fiber Bragg grating stress sensors at key member parts of the iron tower and using the fiber Bragg grating stress sensors to obtain the stress change values at the fixed installation positions.

[0045] S6. According to the stress change parameters at different positions of the iron tower, combined with the finite element model of the tower-line system and the limit effect of the tower under the action of wind and the damaged boundary conditions, judge the state of the iron tower. That is to say, according to the stress values and parameters such as wind speed and wind direction at different member positions obtained by the fiber Bragg grating stress sensors in real time, combined with the finite element model and the limit boundary parameters of the tower, the current state change of the tower can be judged. When the stress change parameters gradually approach the limit damaged boundary conditions, early warning can be realized.

[0046] The foregoing has shown and described the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments, and what is described in the above embodiments and the specification is only to illustrate the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements fall within the scope of the present invention claimed.

Claims

1. A research method for tower stress deformation and wind response, characterized in that It includes the following steps: S1. Establish a finite element model of the tower-line system and determine the distribution of key tower members; S2. Establish a failure tower database based on the data of tower collapses or damaged towers over the years; S3. According to the failure tower database, combined with the current transmission line design standards and the wind-proof design grades of transmission towers, calculate the tower and guy wire parameters under the limit of wind load; S4. According to the tower and guy wire parameters under the limit of wind load, obtain the limit effect of the tower under the action of wind and the boundary conditions of damage; S5. Use the device for studying tower stress deformation and wind response to obtain the stress change parameters at different positions of the tower; S6. According to the stress change parameters at different positions of the tower, combined with the finite element model of the tower-line system and the limit effect of the tower under the action of wind and the boundary conditions of damage, judge the state of the tower; The device for studying tower stress deformation and wind response includes an equipment box, the equipment box is respectively arranged on a number of towers, a power supply component is arranged on the equipment box, a signal processing component is arranged in the equipment box, the power supply component is electrically connected to the signal processing component, the signal processing component is communicatively connected to a monitoring center, and the monitoring center is communicatively connected to a mobile terminal; A number of fiber Bragg grating stress sensors for monitoring the stress changes in different parts of the tower are arranged on the tower, and an auxiliary monitoring component for comprehensively judging the state of the tower by combining the stress changes in different parts is also arranged on the tower, and the fiber Bragg grating stress sensors and the auxiliary monitoring component are both electrically connected to the signal processing component.

2. The research method for tower stress deformation and wind response according to claim 1, characterized in that, The power supply component includes a solar panel, an MPPT controller, a PWM controller, a current converter and a storage battery, the solar panel is electrically connected to the current converter, the current converter is electrically connected to the storage battery, the storage battery is electrically connected to the signal processing component, the MPPT controller is electrically connected to the output side of the solar panel, the MPPT controller is electrically connected to the PWM controller, and the PWM controller is electrically connected to the current converter.

3. The research method for tower stress deformation and wind response according to claim 1 or 2, characterized in that The signal processing component includes a fiber Bragg grating demodulator and a stress state monitor, the fiber Bragg grating demodulator is electrically connected to the fiber Bragg grating stress sensors, the fiber Bragg grating demodulator is electrically connected to the stress state monitor, and the stress state monitor is communicatively connected to the monitoring center through an optical fiber; The stress state monitor is electrically connected to the auxiliary monitoring component.

4. The research method for tower stress deformation and wind response according to claim 3, characterized in that The auxiliary monitoring component includes a micro-meteorological sensor, the micro-meteorological sensor is arranged on the tower, and the micro-meteorological sensor is electrically connected to the stress state monitor through an RS485 communication bus.

5. The research method for tower stress deformation and wind response according to claim 4, characterized in that, The auxiliary monitoring component includes an inclination sensor, the inclination sensor is arranged on the tower, and the inclination sensor is electrically connected to the stress state monitor through an RS485 communication bus.

6. The research method for tower stress deformation and wind response according to claim 4 or 5, characterized in that, The auxiliary monitoring component includes an infrared thermal imaging camera, the infrared thermal imaging camera is arranged on the tower, and the infrared thermal imaging camera is electrically connected to the stress state monitor.

7. The research method for tower stress deformation and wind response according to claim 1, characterized in that, The method for obtaining the stress change parameter in step S5 includes installing fiber Bragg grating stress sensors at key member parts of the iron tower and using the fiber Bragg grating stress sensors to obtain the stress change values at the fixed installation positions.

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