CN106199056A - A kind of distributed wind speed on-line monitoring method in overhead transmission line corridor - Google Patents

Abstract

The present invention relates to the distributed wind speed on-line monitoring method in a kind of overhead transmission line corridor, utilize the optical signal of distributed optical fiber vibration monitor monitoring transmission line of electricity optical-fibre channel, then by using Generalized Morphological wave filter that sampled signal is filtered pretreatment denoising, the frequency of vibration at current time of this signal each particle of comprised optical-fibre channel, the Vibration Parameter of Oscillation Amplitude are obtained further；And then set up the relation between the lift force in the unit length of the vertical wind direction in power transmission line surface, wind speed and cable Vibration Parameter, and then realize air monitoring.

Description

A kind of distributed wind speed on-line monitoring method in overhead transmission line corridor

Technical field

The invention belongs to electric power O&M field, the distributed wind speed particularly to a kind of overhead transmission line corridor is supervised online Survey method.

Background technology

The wind-engaging excitation of overhead transmission line and vibrate, wave serious threat and the safe operation of transmission line of electricity.But due to Lacking related data, power department can not accurately grasp the wind-force level of circuit, it is difficult to assesses the tired of wire, gold utensil, steel tower etc. The labor life-span, it was predicted that the generation of windburn accident；Owing to transmission line of electricity distributed areas are wide, transmission range length, complicated topographical conditions are changeable, Affected greatly by amblent air temperature, patrolled and examined workload by human at periodic intervals completely big, and be difficult to round-the-clock, extensively cover.

Therefore, power department is in the urgent need to a kind of method that line corridor wind speed is carried out on-line monitoring, in order to assessment line The running status on road and degree of fatigue.And wish, by the data of existing field real-time measurement being analyzed and processing, to grasp in time Transmission line of electricity windburn situation changes；By the safe operation offer real-time early warning service being transmission line of electricity to wind-force information analysis, Improve the operational reliability of transmission line equipment and reduce maintenance cost.

Summary of the invention

The problem that the above-mentioned prior art that the invention aims to solve exists, it is provided that a kind of overhead transmission line is walked The distributed wind speed on-line monitoring method of corridor, the cable having optical fiber of overhead transmission line configuration.This monitoring method is without online Sensor is additionally installed, by detecting the vibrational state of transmission line of electricity mating optical passage, in conjunction with the vibration of transmission line of electricity on road With Wind speed model, it is achieved the distributed air monitoring of power transmission line corridor.

The technical scheme is that

The distributed wind speed in a kind of overhead transmission line corridor is configured with optical fiber at line method, described overhead transmission line Cable, it is characterised in that fiber-optic vibration the monitoring data of systematic survey, the distributed vibration equation of transmission line of electricity are in a distributed manner The wind speed size in computing electric power line corridor is carried out on basis.

Described overhead transmission line is OPGW optical, OPPC OPPC or all-dielectric, self-supporting Formula optical cable ADSS.

After blowing air over power transmission line, due to the viscous effect of air, bigger boundary region, limit can be produced on power transmission line surface Periodic Kalman's whirlpool is peeled off and then formed to interlayer because of power transmission line uneven surface.Kalman's whirlpool can cause power transmission line The lift force change of the vertical wind direction in surface and then generation air vibration, and then define power transmission line wind-induced vibration；The intensity of vibration Closely related with wind speed.Therefore, by monitoring the Vibration Condition of transmission line of electricity optical channel, it is possible to be finally inversed by power transmission line corridor Wind conditions.According to wind speed, unbalanced tensile force and the physical relationship of vibration, the distributed wind in a kind of overhead transmission line corridor Speed is at line method, it is characterised in that specifically follow the steps below:

Step 1: after utilizing distributed optical fiber vibration monitor to send light beam pulse in optical fiber, uses high-speed data to adopt Truck gathers phase place and the polarization information of the back-scattering light in optical fiber；Then with Generalized Mathematical Morphologic filters to collection Optical signal is filtered computing, the noise in eliminating tolerancing signal, obtain further this signal each particle of comprised optical-fibre channel The frequency of vibration of current time, Oscillation Amplitude parameter；

Step 2: according to the monitoring result in step 1, obtains transmission line of electricity optical-fibre channel each particle when wind-engaging encourages and exists The immediate movement U of off-center point during vibration, counted the time t determined by sample frequency and collection, and then is calculated wire body Second-order partial differential coefficient on time tSecond-order partial differential coefficient on space length xAnd then wire body upper and lower surface unit is long Unbalanced tensile force on degree i.e. shows as lift force F_l, expressed according to the partial differential equation of second order of immediate movement U:

$F_l=m\frac{{\∂}^{2}U}{\∂t^2}-T_0\frac{{\∂}^{2}U}{\∂x^2}---\left(1\right)$

In formula, the cable weight in m unit length, it is considered as constant, kg/m；

The distance that x particle to be calculated exports with strain clamp, m；

The t time, s；

The displacement of off-center point, m during the vibration of U particle to be calculated；

T₀The Horizontal Tension of power transmission cable, the construction of line well is considered as a constant, N later；

Step 3: according to the monitoring result in step 1, obtains transmission line of electricity optical-fibre channel each particle when wind-engaging encourages and exists Angle of throw frequencies omega=2 π f during vibration, wherein f is the frequency of vibration on institute's survey line road, according to hydromechanical theory, power transmission line Lift force F in the unit length of surface_l, it is also possible to being expressed as following formula by wind speed and frequency of vibration, unit is N/m

F_i=0.5 ρ V²DC_lsin(ωt) (2)

In formula, ρ atmospheric density, kg/m³；

V wind speed, m/s；

The diameter of D optical fiber place cable, m；

C_lLift coefficient, is considered as constant, dimensionless for given system；

The angular frequency during vibration of ω power transmission line, rad/s；

The t time, s.

Step 4: just can set up the relation between wind speed V and cable Vibration Parameter by formula (1), (2):

$0.5{\mathrm{\ρV}}^2{\mathrm{DC}}_l\sin \left(\mathrm{\ω}t\right)=m\frac{{\∂}^{2}U}{\∂t^2}-T_0\frac{{\∂}^{2}U}{\∂x^2}---\left(3\right)$

In formula, ρ, D, C_l、m、T₀For circuit design parameters or constant, for known quantity or by the data scaling of early stage Obtaining, ω, t, U, x are the monitoring of distributed optical fiber vibration monitor, can value measured directly；

According to formula (3), just calculate with strain clamp outlet distance x at wind speed V:

$V=\sqrt{\frac{(m\frac{{\∂}^{2}U}{\∂t^2}-T_0\frac{{\∂}^{2}U}{\∂x^2})}{0.5{\mathrm{\ρDC}}_l\sin \left(\mathrm{\ω}t\right)}}---\left(4\right)$

Step 5: identical algorithm extends to each locus of transmission line of electricity, then be achieved that whole piece power transmission line corridor Wind speed calculates.

The present invention can be in conjunction with the parameter (linear mass, Horizontal Tension etc.) of transmission line of electricity self or pass through early stage The demarcation of some data, it is achieved the distributed wind speed on-line monitoring of power transmission line corridor.This system and method can be to transmission of electricity The wind speed of line corridor carries out real-time, online monitoring, effectively promotes the operational reliability of transmission line of electricity system, reduces manpower thing Power consumes.

Accompanying drawing explanation

Fig. 1 is the method step flow chart of the present invention；

Detailed description of the invention

In conjunction with accompanying drawing, the invention will be further described.A kind of distributed wind speed on-line monitoring in overhead transmission line corridor Method, including step as shown in Figure 1:

Step 1: utilize the optical signal of distributed optical fiber vibration monitor monitoring transmission line of electricity optical-fibre channel, then use wide Justice Morphologic filters is filtered pretreatment to sampled signal, and the concrete grammar of pretreatment is: distributed optical fiber vibration is monitored After instrument sends light beam pulse in optical fiber, high-speed data acquisition card is used to gather the phase place and partially of back-scattering light in optical fiber The information such as shake, and for subsequent treatment；Owing to the sampled signal in reality usually contains the noise of variety classes, different frequency, Therefore, the structural element of short-scale can preferably filter the radio-frequency component in noise, has an effect of smooth waveform, and long chi The structural element then low pass effect of degree is obvious, need to choose according to actual signal waveform and conventional experience, use Generalized Mathematical shape State wave filter is filtered computing to the optical signal gathered, and can obtain this signal institute further with the noise in eliminating tolerancing signal Comprise the frequency of vibration at current time of each particle of optical-fibre channel, Oscillation Amplitude parameter.

Step 2: according to the monitoring result in step 1, obtains transmission line of electricity optical-fibre channel each particle when wind-engaging encourages and exists The immediate movement U of off-center point during vibration, counted the time t determined by sample frequency and collection, and then is calculated wire body Second-order partial differential coefficient on time tSecond-order partial differential coefficient on space length xAnd then wire body upper and lower surface unit is long Unbalanced tensile force on degree i.e. lift force F_lCan also be expressed according to the partial differential equation of second order of immediate movement U:

$F_l=m\frac{{\∂}^{2}U}{\∂t^2}-T_0\frac{{\∂}^{2}U}{\∂x^2}---\left(1\right)$

In formula, the cable weight in m unit length, can be considered constant, kg/m；

The distance that x particle to be calculated exports with strain clamp, m；

The t time, s；

The displacement of off-center point, m during the vibration of U particle to be calculated；

T₀The Horizontal Tension of power transmission cable, the construction of line well can be considered a constant, N later；

Step 3: according to the monitoring result in step 1, it is also possible to obtain transmission line of electricity optical-fibre channel each when wind-engaging encourages The particle angle of throw frequencies omega=2 π f when vibration, wherein f is the frequency of vibration on institute's survey line road.According to hydromechanical theory, Lift force in the unit length of power transmission line surface can also be expressed as (unit: N/m) by wind speed and frequency of vibration:

F_l=0.5 ρ V²DC_lsin(ωt) (2)

In formula, ρ atmospheric density, kg/m³；

V wind speed, m/s；

The diameter of D optical fiber place cable, m；

C_lLift coefficient, for given system, can be considered constant, dimensionless；

The angular frequency during vibration of ω power transmission line, rad/s；

The t time, s.

Step 4: just can set up the relation between wind speed V and cable Vibration Parameter by formula (1) (2):

$0.5{\mathrm{\ρV}}^2{\mathrm{DC}}_l\sin \left(\mathrm{\ω}t\right)=m\frac{{\∂}^{2}U}{\∂t^2}-T_0\frac{{\∂}^{2}U}{\∂x^2}---\left(3\right)$

In formula, ρ, D, C_l、m、T₀For circuit design parameters or constant, for known quantity or can be by the data mark of early stage Fixed acquisition, ω, t, U, x are that the monitoring of distributed optical fiber vibration monitor can measured directly be worth.

According to formula (3), it is possible to calculate with strain clamp outlet distance x at wind speed V:

$V=\sqrt{\frac{(m\frac{{\∂}^{2}U}{\∂t^2}-T_0\frac{{\∂}^{2}U}{\∂x^2})}{0.5{\mathrm{\ρDC}}_l\sin \left(\mathrm{\ω}t\right)}}---\left(4\right)$

Step 5: identical algorithm extends to each locus of transmission line of electricity, then be achieved that whole piece power transmission line corridor Wind speed calculates.

Claims (3)

1. the distributed wind speed in overhead transmission line corridor is configured with optical fiber at a line method, described overhead transmission line Cable, it is characterised in that the fiber-optic vibration monitoring data of systematic survey, the distributed vibration equation of transmission line of electricity are base in a distributed manner Plinth carrys out the wind speed size in computing electric power line corridor.

The most according to claim 1, the distributed wind speed in overhead transmission line corridor is at line method, it is characterised in that described Overhead transmission line is OPGW optical, OPPC OPPC or All Dielectric self-support ADSS.

The distributed wind speed in overhead transmission line corridor the most according to claim 1 or claim 2 is at line method, it is characterised in that concrete Follow the steps below:

Step 1: after utilizing distributed optical fiber vibration monitor to send light beam pulse in transmission line of electricity optical fiber, uses high speed number According to phase place and the polarization information of the back-scattering light in capture card collection transmission line of electricity optical fiber, and use Generalized Morphological wave filter Sampled signal is filtered computing, the noise in eliminating tolerancing signal, obtain this signal each particle of comprised optical-fibre channel further The frequency of vibration at current time, Oscillation Amplitude parameter；

Step 2: according to the monitoring result in step 1, obtains transmission line of electricity optical-fibre channel each particle when wind-engaging encourages and is vibrating Time off-center point immediate movement U, counted the time t determined by sample frequency and collection, and then be calculated wire body time Between second-order partial differential coefficient on tSecond-order partial differential coefficient on space length xAnd then in wire body upper and lower surface unit length Unbalanced tensile force i.e. shows as lift force F_l, expressed according to the partial differential equation of second order of immediate movement U:

$F_l=m\frac{{\∂}^{2}U}{\∂t^2}-T_0\frac{{\∂}^{2}U}{\∂x^2}---\left(1\right)$

In formula, the cable weight in m unit length, it is considered as constant, kg/m；

The distance that x particle to be calculated exports with strain clamp, m；

The t time, s；

The displacement of off-center point, m during the vibration of U particle to be calculated；

T₀The Horizontal Tension of power transmission cable, the construction of line well is considered as a constant, N later；

Step 3: according to the monitoring result in step 1, obtains transmission line of electricity optical-fibre channel each particle when wind-engaging encourages and is vibrating Time angle of throw frequencies omega=2 π f, wherein f is the frequency of vibration on institute's survey line road, according to hydromechanical theory, power transmission line body surface Lift force F in the unit length of face_l, it being expressed as following formula by wind speed and frequency of vibration, unit is N/m

F_i=0.5 ρ V²DC_lsin(ωt) (2)

In formula, ρ atmospheric density, kg/m³；

V wind speed, m/s；

The diameter of D optical fiber place cable, m；

C_lLift coefficient, is considered as constant, dimensionless for given system；

The angular frequency during vibration of ω power transmission line, rad/s；

The t time, s；

Step 4: set up the relation between wind speed V and cable Vibration Parameter by formula (1), (2):

$0.5{\mathrm{\ρV}}^2{\mathrm{DC}}_l\sin \left(\mathrm{\ω}t\right)=m\frac{{\∂}^{2}U}{\∂t^2}-T_0\frac{{\∂}^{2}U}{\∂x^2}---\left(3\right)$

In formula, ρ, D, C_l、m、T₀For circuit design parameters or constant, obtain for known quantity or by the data scaling of early stage, ω, t, U, x are the monitoring of distributed optical fiber vibration monitor, can value measured directly；

According to formula (3), just calculate with strain clamp outlet distance x at wind speed V:

$V=\sqrt{\frac{\left(m\frac{{\∂}^{2}U}{\∂t^2}-T_0\frac{{\∂}^{2}U}{\∂x^2}\right)}{0.5{\mathrm{\ρDC}}_l\sin \left(\mathrm{\ω}t\right)}}---\left(4\right)$

Step 5: identical algorithm extends to each locus of transmission line of electricity, the most just realizes the anemometer of whole piece power transmission line corridor Calculate.