Power Transmission Line Wind Disaster Monitoring System Based on Optical Fiber Sensing

Abstract

The present invention belongs to the field of monitoring, and discloses a transmission line wind disaster monitoring system based on optical fiber sensing, which includes a transmitting module, a receiving module, and a signal analysis module; the transmitting module is used to emit a laser beam into the optical fiber at an adaptive frequency; the receiving module is used to receive the laser beam from the optical fiber; the signal analysis module is used to process the laser beam received by the receiving module to obtain the vibration signal of the transmission line, and perform wind disaster monitoring on the transmission line based on the vibration signal; wherein, the transmitting module includes an effective duration calculation unit and an adaptive frequency calculation unit; the effective duration calculation unit is used to calculate the effective duration of the adaptive frequency; the adaptive frequency calculation unit is used to calculate the adaptive frequency. The present invention makes the monitoring process more energy-saving and can ensure that corresponding and sufficient vibration signals can be obtained in time when the state of the transmission line changes.

Description

Technical Field

[0001] The invention relates to the field of monitoring, and in particular to a wind disaster monitoring system for power transmission lines based on optical fiber sensing. Background Art

[0002] Optical fiber sensing includes two functions: sensing and transmitting external signals (measured). The so-called sensing (or sensitivity) means that the physical characteristic parameters of the light waves transmitted in the optical fiber, such as intensity (power), wavelength, frequency, phase and polarization state, change according to the law of change of external signals. Measuring the change of optical parameters is to "sense" the change of external signals.

[0003] Typhoons and other wind disasters have a great impact on transmission lines. During wind disasters, the risk of transmission line rupture increases. In order to achieve real-time monitoring of transmission lines, the existing technology uses distributed optical fiber sensing technology to obtain the vibration signal of the transmission line, and then analyzes the vibration signal to obtain the situation of the transmission line being affected by the wind disaster, so as to timely discover the location of the transmission line damaged by the wind disaster, which is conducive to improving the efficiency of emergency repairs.

[0004] In the prior art, when using optical fiber sensing technology to measure transmission lines, a fixed transmission frequency is generally used to emit laser beams. However, when the wind is weak, the vibration signal obtained will not change significantly within a certain period of time, which results in a vibration signal with little use value. The frequency of the laser beam generated within this period of time is obviously too high, resulting in excessive power consumption for wind disaster monitoring of transmission lines. Summary of the invention

[0005] The purpose of the present invention is to disclose a power transmission line wind disaster monitoring system based on optical fiber sensing, so as to solve the problem of how to reduce power consumption when using optical fiber sensing technology to monitor power transmission lines for wind disasters.

[0006] In order to achieve the above object, the present invention adopts the following technical solution:

[0007] A wind disaster monitoring system for power transmission lines based on optical fiber sensing, including a transmitting module, a receiving module and a signal analysis module;

[0008] The transmitting module is used to transmit a laser beam into the optical fiber using an adaptive frequency;

[0009] The receiving module is used for receiving the laser beam from the optical fiber;

[0010] The signal analysis module is used to process the laser beam received by the receiving module, obtain the vibration signal of the transmission line, and perform wind disaster monitoring on the transmission line based on the vibration signal;

[0011] Among them, the transmitting module includes an effective duration calculation unit and an adaptive frequency calculation unit;

[0012] The effective duration calculation unit is used to calculate the effective duration of the adaptive frequency;

[0013] The adaptive frequency calculation unit is used to calculate the adaptive frequency;

[0014] When trnsidx k -trnsidx k-1 ≥thsd, the calculation function of the adaptive frequency is as follows:

[0015]

[0016] When trnsidx k -trnsidx k-1 <thsd, the calculation function of the adaptive frequency is as follows:

[0017]

[0018] Among them, trnsidx k and trnsidx k-1 respectively represent the change coefficients of the vibration signal during the effective time of the k-th adaptive frequency and the (k - 1)-th adaptive frequency; rfrq k+1 and rfrq k respectively represent the (k + 1)-th adaptive frequency and the k-th adaptive frequency; thsd is the set comparison threshold, esip is the change amplitude of the adaptive frequency, and mavalue and mivalue are the maximum and minimum values of the adaptive frequency respectively.

[0019] Optionally, the calculation method of the effective duration of the adaptive frequency is:

[0020] Use cntime k+1 to represent the effective duration of the (k + 1)-th adaptive frequency, and use cntime k to represent the effective duration of the k-th adaptive frequency,

[0021] When trnsidx k -trnsidx k-1 ≥thsd,

[0022]

[0023] When trnsidx k -trnsidx k-1 <thsd,

[0024]

[0025] csdc std is the reference value of the set change coefficient, and δ is the set basic change value.

[0026] Optionally, the transmitting module further includes a light source unit,

[0027] The light source unit is used to generate a laser beam.

[0028] Optionally, the transmitting module further includes a transmitting unit,

[0029] The transmitting unit is used to transmit the laser beam into the optical fiber at an adaptive frequency.

[0030] Optionally, the signal analysis module includes a photoelectric detection unit;

[0031] The photoelectric detection unit is used to convert the laser beam received by the receiving module from an optical signal into an electrical signal.

[0032] Optionally, the signal analysis module further includes a signal amplification unit;

[0033] The signal amplification unit is used to amplify the electrical signal obtained by the photoelectric detection unit to obtain an amplified electrical signal.

[0034] Optionally, the signal analysis module further includes a filtering unit, and the filtering unit is used to filter the amplified electrical signal to obtain the vibration signal of the transmission line.

[0035] Optionally, the signal analysis module further includes a monitoring unit;

[0036] The monitoring unit is used to obtain the characteristic parameters of the vibration signal and perform wind disaster monitoring on the transmission line based on the characteristic parameters.

[0037] In the process of using the optical fiber sensing technology to monitor the wind disaster of the transmission line, the present invention uses an adaptive frequency to transmit the laser beam. When the vibration signal changes rapidly, that is, when the transmission line is blown by the wind and the vibration amplitude becomes larger and larger, the adaptive frequency will become larger and larger. The present invention will obtain the vibration signal of the transmission line more frequently per unit time. On the contrary, when the change amplitude of the vibration signal is small, the adaptive frequency will become smaller and smaller, thereby reducing the number of times of obtaining the vibration signal per unit time. Compared with setting a fixed acquisition frequency, when the transmission line is not blown by the wind, the present invention obtains fewer vibration signals per unit time, so that the monitoring process is more energy-saving. At the same time, the present invention can ensure that corresponding and sufficient vibration signals are obtained in time when the state of the transmission line changes. Description of the Drawings

[0038] The accompanying drawings forming a part of this application are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0039] Figure 1 It is a schematic diagram of a transmission line wind disaster monitoring system based on optical fiber sensing. Detailed implementation manners

[0040] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and in no way restrictive of the present invention and its application or use.

[0041] As Figure 1 shown in an embodiment, the present invention provides a transmission line wind disaster monitoring system based on optical fiber sensing, including a transmitting module 101, a receiving module 201, and a signal analysis module 301;

[0042] The transmitting module 101 is used to transmit a laser beam into the optical fiber at an adaptive frequency;

[0043] The receiving module 201 is used to receive the laser beam from the optical fiber;

[0044] The signal analysis module 301 is used to process the laser beam received by the receiving module 201, obtain the vibration signal of the transmission line, and monitor the wind disaster of the transmission line based on the vibration signal;

[0045] Among them, the transmitting module 101 includes an effective duration calculation unit and an adaptive frequency calculation unit;

[0046] The effective duration calculation unit is used to calculate the effective duration of the adaptive frequency;

[0047] The adaptive frequency calculation unit is used to calculate the adaptive frequency;

[0048] When |trnsidx k -trnsidx k-1 |≥thsd, the calculation function of the adaptive frequency is as follows:

[0049]

[0050] When |trnsidx k -trnsidx k-1 |<thsd, the calculation function of the adaptive frequency is as follows:

[0051]

[0052] Among them, trnsidx k and trnsidx k-1 respectively represent the change coefficients of the vibration signal during the effective time of the k-th adaptive frequency and the (k - 1)-th adaptive frequency; rfrq k+1 and rfrq k respectively represent the (k + 1)-th adaptive frequency and the k-th adaptive frequency; thsd is the set comparison threshold, esip is the change amplitude of the adaptive frequency, mavalue and mivalue are respectively the maximum value and the minimum value of the adaptive frequency.

[0053] In the process of using the optical fiber sensing technology to monitor the wind disasters of the transmission line, the present invention adopts an adaptive frequency to emit a laser beam. When the vibration signal changes rapidly, that is, when the transmission line is blown by the wind and the vibration amplitude becomes larger and larger, the adaptive frequency will become larger and larger. The present invention will obtain the vibration signal of the transmission line more frequently per unit time. On the contrary, when the change amplitude of the vibration signal is small, the adaptive frequency will become smaller and smaller, thereby reducing the number of times of obtaining the vibration signal per unit time. Compared with setting a fixed acquisition frequency, when the transmission line is not blown by the wind, the present invention obtains fewer vibration signals per unit time, so that the monitoring process is more energy-saving. At the same time, the present invention can ensure that corresponding and sufficient vibration signals can be obtained in time when the state of the transmission line changes.

[0054] Optionally, during the effective time of the k-th adaptive frequency, the calculation function of the change coefficient trnsidx k is:

[0055]

[0056] Among them, w1, w2, and w3 are the first calculation weight, the second calculation weight, and the third calculation weight respectively, N(k) is the number of times of emitting the laser beam during the effective time period of the k-th adaptive frequency, s i,1 is the amplitude of the first vibration signal obtained when the laser beam is emitted for the i-th time, s i,T is the amplitude of the T-th vibration signal obtained when the laser beam is emitted for the i-th time, zdfs is the set average vibration amplitude, s 1,j is the amplitude of the j-th vibration signal obtained when the laser beam is emitted for the first time, s N(k),j is the amplitude of the j-th vibration signal obtained when the laser beam is emitted for the N(k)-th time, fcd is a constant, sue is the set of vibration signals that satisfy |s 1,j -s N(k),j |≥Q during the effective time period of the k-th adaptive frequency, Q is the judgment threshold, t mis the serial number of element m in set sue, t m ∈ [1, T], and num_sue is the number of elements in sue.

[0057] In the process of calculating the variation coefficient of the vibration signal, the present invention performs weighted calculation from aspects such as the amplitude of the vibration signal obtained from all emission times, the numerical difference of the vibration signals with the same serial number between the first laser beam emission and the last laser beam emission, and the mean value between the serial numbers of the vibration signals with larger variation amplitude, so as to obtain the variation situation of the vibration signal within the effective time period of a single adaptive frequency, enabling the difference between the variation coefficients of two adjacent vibration signals to represent the variation of the vibration signal between two time periods, thereby facilitating the obtaining of a more accurate adaptive frequency.

[0058] Optionally, the calculation method of the effective duration of the adaptive frequency is as follows:

[0059] Use cntime k+1 to represent the effective duration of the (k + 1)-th adaptive frequency, and use cntime k to represent the effective duration of the k-th adaptive frequency.

[0060] When |trnsidx k - trnsidx k-1 | ≥ thsd,

[0061]

[0062] When |trnsidx k - trnsidx k-1 | < thsd,

[0063]

[0064] csdc std is the set variation coefficient reference value, and δ is the set basic variation value.

[0065] In the present invention, the effective time of each adaptive frequency also changes with the change of the state of the transmission line. The greater the difference between the variation coefficients of the vibration signals between two adaptive frequencies, the smaller the effective duration of the adaptive frequency, thereby improving the update speed of the adaptive frequency and ensuring that enough vibration signals are obtained for monitoring when the transmission line is affected by wind and the state changes rapidly. On the contrary, the longer the effective duration of the adaptive frequency, the lower the update speed of the adaptive frequency, so that the adaptive frequency can last for a longer time with fewer values, reducing the power consumption during the monitoring process.

[0066] Optionally, the transmitting module 101 further includes a light source unit.

[0067] The light source unit is used to generate a laser beam.

[0068] Optionally, the transmitting module 101 further includes a transmitting unit,

[0069] The transmitting unit is used to transmit the laser beam into the optical fiber with an adaptive frequency.

[0070] Optionally, the signal analysis module 301 includes a photoelectric detection unit;

[0071] The photoelectric detection unit is used to convert the laser beam received by the receiving module 201 from an optical signal into an electrical signal.

[0072] Optionally, the signal analysis module 301 further includes a signal amplification unit;

[0073] The signal amplification unit is used to amplify the electrical signal obtained by the photoelectric detection unit to obtain an amplified electrical signal.

[0074] Optionally, the signal analysis module 301 further includes a filtering unit, and the filtering unit is used to perform filtering processing on the amplified electrical signal to obtain the vibration signal of the transmission line.

[0075] Optionally, performing filtering processing on the amplified electrical signal includes:

[0076] Using a median filtering algorithm or a moving average filtering algorithm to perform filtering processing on the amplified electrical signal.

[0077] Optionally, the signal analysis module 301 further includes a monitoring unit;

[0078] The monitoring unit is used to obtain the characteristic parameters of the vibration signal and perform wind disaster monitoring on the transmission line based on the characteristic parameters.

[0079] Specifically, the characteristic parameters include amplitude, peak value, average value, root mean square, etc.

[0080] For example, when the amplitude of the vibration signal at a certain position exceeds the set amplitude threshold, it indicates that the degree of influence of the wind on this position is relatively large and it is very likely to break, so it is necessary to strengthen the inspection of this position.

[0081] Those of ordinary skill in the art can also understand that all or part of the steps in implementing the methods of the above embodiments can be completed by instructing relevant hardware through a program, and the program can be stored in a computer-readable storage medium, and the storage medium includes ROM / RAM, disks, optical discs, etc.

[0082] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. Transmission line wind disaster monitoring system based on optical fiber sensing, characterized in that, It includes a transmitting module, a receiving module and a signal analysis module; The transmitting module is used to transmit a laser beam into the optical fiber at an adaptive frequency; The receiving module is used to receive the laser beam from the optical fiber; The signal analysis module is used to process the laser beam received by the receiving module to obtain the vibration signal of the transmission line, and monitor the wind disaster of the transmission line based on the vibration signal; Among them, the transmitting module includes an effective duration calculation unit and an adaptive frequency calculation unit; The effective duration calculation unit is used to calculate the effective duration of the adaptive frequency; The adaptive frequency calculation unit is used to calculate the adaptive frequency; When the calculation function of the adaptive frequency is as follows: When the calculation function of the adaptive frequency is as follows: Among them, and respectively represent the change coefficients of the vibration signal during the effective time of the k-th adaptive frequency and the (k - 1)-th adaptive frequency; and respectively represent the (k + 1)-th adaptive frequency and the k-th adaptive frequency; is the set comparison threshold, is the change amplitude of the adaptive frequency, and are respectively the maximum value and the minimum value of the adaptive frequency; During the k-th adaptive frequency effective time, the variation coefficient of the vibration signal The calculation function is as follows: Among them, , , are the first calculation weight, the second calculation weight, and the third calculation weight respectively. is the number of times of emitting the laser beam within the effective time period of the k-th adaptive frequency. is the amplitude of the first vibration signal obtained when the laser beam is emitted for the i-th time. is the amplitude of the T-th vibration signal obtained when the laser beam is emitted for the i-th time. is the set vibration amplitude mean value set. is the amplitude of the j-th vibration signal obtained when the laser beam is emitted for the first time. is the -th time when the laser beam is emitted, and it is the amplitude of the j-th vibration signal obtained. is a constant. is the set of vibration signals that satisfy within the effective time period of the k-th adaptive frequency, where Q is the judgment threshold. is the serial number of the element m in the set . , is the number of elements in.

2. The transmission line wind disaster monitoring system based on optical fiber sensing according to claim 1, wherein The calculation method of the effective duration of the adaptive frequency is: Use to represent the effective duration of the (k + 1)-th adaptive frequency, and use to represent the effective duration of the k-th adaptive frequency. When then When , is the reference value of the set change coefficient, is the set basic change value.

3. The transmission line wind disaster monitoring system based on optical fiber sensing according to claim 1, characterized in that, The transmitting module further includes a light source unit, The light source unit is used to generate a laser beam.

4. The transmission line wind disaster monitoring system based on optical fiber sensing according to claim 3, wherein, The transmitting module further includes a transmitting unit, The transmitting unit is used to transmit a laser beam into the optical fiber at an adaptive frequency.

5. The optical fiber sensing-based transmission line wind disaster monitoring system according to claim 1, wherein The signal analysis module includes a photoelectric detection unit; The photoelectric detection unit is used to convert the laser beam received by the receiving module from an optical signal into an electrical signal.

6. The transmission line wind disaster monitoring system based on optical fiber sensing according to claim 5, characterized in that, The signal analysis module further includes a signal amplification unit; The signal amplification unit is used to amplify the electrical signal obtained by the photoelectric detection unit to obtain an amplified electrical signal.

7. The transmission line wind disaster monitoring system based on optical fiber sensing according to claim 6, characterized in that, The signal analysis module further includes a filtering unit, and the filtering unit is used to filter the amplified electrical signal to obtain the vibration signal of the transmission line.

8. The transmission line wind disaster monitoring system based on optical fiber sensing according to claim 7, characterized in that, The signal analysis module further includes a monitoring unit; The monitoring unit is used to obtain the characteristic parameters of the vibration signal, and monitor the wind disaster of the transmission line based on the characteristic parameters.

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