CN113092879A - Transmission line lightning stroke monitoring method, device, equipment and storage medium - Google Patents
Transmission line lightning stroke monitoring method, device, equipment and storage medium Download PDFInfo
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- CN113092879A CN113092879A CN202110351676.5A CN202110351676A CN113092879A CN 113092879 A CN113092879 A CN 113092879A CN 202110351676 A CN202110351676 A CN 202110351676A CN 113092879 A CN113092879 A CN 113092879A
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/08—Measuring electromagnetic field characteristics
- G01R29/0807—Measuring electromagnetic field characteristics characterised by the application
- G01R29/0814—Field measurements related to measuring influence on or from apparatus, components or humans, e.g. in ESD, EMI, EMC, EMP testing, measuring radiation leakage; detecting presence of micro- or radiowave emitters; dosimetry; testing shielding; measurements related to lightning
- G01R29/0842—Measurements related to lightning, e.g. measuring electric disturbances, warning systems
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- G01K11/32—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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Abstract
The invention discloses a lightning stroke monitoring method, a lightning stroke monitoring device, equipment and a storage medium for a power transmission line. The lightning stroke monitoring method for the power transmission line comprises the following steps: collecting a current curve of lightning stroke current flowing on the OPGW optical cable and a temperature change curve of the OPGW optical cable; determining the type of lightning stroke according to the current curve and the temperature change curve; determining the confidence coefficient of the lightning stroke according to the current curve, the temperature change curve and the lightning stroke type; and judging whether the lightning stroke occurs or not based on the confidence coefficient. By acquiring the lightning current size change and the temperature change flowing on the OPGW optical cable, the misjudgment caused by separately acquiring the lightning current size or the temperature change can be avoided, so that the judgment accuracy is further improved.
Description
Technical Field
The embodiment of the invention relates to a power transmission line safety technology, in particular to a power transmission line lightning stroke monitoring method, device, equipment and storage medium.
Background
High-voltage overhead lines are exposed in the field for a long time and are easy to be damaged by lightning, and lightning strike becomes an important cause for tripping of power transmission lines and faults of power transmission and transformation equipment.
At present, lightning stroke is mainly detected by a traveling wave method, namely, lightning stroke monitoring and fault positioning are realized by monitoring the transient traveling wave propagation time of voltage and current propagated from a fault point to two ends of a power transmission line and combining the traveling wave speed when a fault occurs.
However, when lightning strike is monitored by the traveling wave method, the problem that the guided wave signals are easy to distort exists, and different lightning strike faults and bus structures influence the speed of the traveling wave, so that the speed of the traveling wave has uncertainty, the unreliability of lightning strike monitoring is caused, and the misjudgment rate is high.
Disclosure of Invention
The invention provides a lightning stroke monitoring method, a lightning stroke monitoring device, equipment and a storage medium for a power transmission line, and aims to realize lightning stroke monitoring of the power transmission line.
In a first aspect, an embodiment of the present invention provides a power transmission line lightning strike monitoring method, including:
collecting a current curve of lightning stroke current flowing on an OPGW optical cable and a temperature change curve of the OPGW optical cable;
determining the type of lightning stroke according to the current curve and the temperature change curve;
determining the confidence coefficient of the occurrence of the lightning stroke according to the current curve, the temperature change curve and the lightning stroke type;
and judging whether the lightning stroke occurs or not based on the confidence coefficient.
In a second aspect, an embodiment of the present invention further provides a power transmission line lightning strike monitoring device, including:
the system comprises an acquisition module, a control module and a control module, wherein the acquisition module is used for acquiring a current curve of lightning strike current flowing on an OPGW optical cable and a temperature change curve of the OPGW optical cable;
the determining module is used for determining the type of lightning stroke according to the current curve and the temperature change curve;
the calculation module is used for determining the confidence coefficient of the occurrence of the lightning stroke according to the current curve, the temperature change curve and the lightning stroke type;
and the judging module is used for judging whether the lightning stroke occurs or not based on the confidence coefficient.
In a third aspect, an embodiment of the present invention further provides a power transmission line lightning strike monitoring device, where the device includes:
one or more processors;
a storage device for storing one or more programs,
when the one or more programs are executed by the one or more processors, the one or more processors are caused to implement the method for transmission line lightning strike monitoring according to the first aspect.
In a fourth aspect, an embodiment of the present invention further provides a storage medium containing computer-executable instructions, where the computer-executable instructions, when executed by a computer processor, are configured to perform the method for monitoring lightning strike on a power transmission line according to the first aspect.
According to the invention, by acquiring the lightning current size change and the temperature change flowing on the OPGW optical cable, the misjudgment caused by independently acquiring the lightning current size or the temperature change can be avoided, so that the judgment accuracy is further improved.
Drawings
FIG. 1 is a flowchart of a lightning strike monitoring method for a power transmission line according to a first embodiment of the invention;
FIG. 2a is a flowchart of a lightning strike monitoring method for a power transmission line according to a first embodiment of the invention;
FIG. 2b is a diagram of a lightning strike monitor of a transmission line according to a first embodiment of the invention;
FIG. 3 is a structural diagram of a lightning strike monitoring device of a power transmission line according to a first embodiment of the invention;
fig. 4 is a structural diagram of a lightning strike monitoring device for a power transmission line according to a first embodiment of the invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Example one
Fig. 1 is a flowchart of a lightning strike monitoring method for a power transmission line according to an embodiment of the present invention, where this embodiment is applicable to a lightning strike monitoring situation of a power transmission line with an OPGW optical cable, and the method may be executed by the lightning strike monitoring device for a power transmission line according to the embodiment of the present invention. The method specifically comprises the following steps:
and 110, collecting a current curve of lightning current flowing on the OPGW optical cable and a temperature change curve of the OPGW optical cable.
An OPGW Optical cable (Optical Fiber Composite Overhead Ground Wire) is a Composite Overhead Ground Wire integrating Ground Wire and communication functions, and an Optical Fiber is placed in a Ground Wire of an Overhead high-voltage transmission line to form an Optical Fiber communication network on a transmission line.
Lightning stroke mainly means that overvoltage caused by thundercloud discharge establishes a discharge channel through a line tower, so that insulation breakdown of a line can be caused, and the safe operation of the line is damaged. In the embodiment of the invention, the lightning current is conducted through the outer conductor of the OPGW optical cable in the lightning discharging process, and the current curve of the lightning current required to be collected is the condition that the size of the lightning current applied to the outer conductor of the OPGW optical cable after lightning stroke changes along with the time. If lightning directly strikes on the OPGW optical cable, the surface of the OPGW optical cable is rapidly heated, so that temperature change can be detected on the OPGW optical cable, and the temperature change curve in the embodiment of the invention refers to temperature change information of each point along the OPGW optical cable.
In a specific embodiment, as for the acquisition of the current curve and the temperature change curve, the detection light may be sent to the OPGW optical cable by an optical time domain reflectometer, and the scattered light reflected and returned from the inside of the OPGW optical cable is collected to realize the information collection of the current and the temperature change on the surface of the OPGW optical cable, that is, the current curve and the temperature change curve described in the embodiment of the present invention may be obtained. In other embodiments, the current curve of the lightning strike current flowing through the OPGW optical cable and the temperature change curve of the OPGW optical cable may also be collected by other methods, for example, a current collecting device and a temperature collecting device are disposed on the OPGW optical cable for collection.
And 120, determining the lightning stroke type according to the current curve and the temperature change curve.
In the embodiment of the invention, when lightning strike occurs, the lightning strike current acts on different positions of the OPGW optical cable, the magnitude of the lightning strike current flowing on the OPGW optical cable, the frequency change state of the lightning strike current and the temperature change of the OPGW optical cable are different, and the lightning strike current flowing on the OPGW optical cable, the frequency change and the temperature change of the OPGW optical cable can be simultaneously combined to comprehensively judge whether the lightning strike directly acts on the OPGW optical cable, a tower or a tower top conductor.
And step 130, determining the confidence coefficient of the lightning stroke according to the current curve, the temperature change curve and the lightning stroke type.
In the embodiment of the present invention, the lightning strike type determined in the foregoing step 120 is a lightning strike type to which the detected current curve and temperature variation curve may correspond, and a lightning strike may not actually occur, but only the current variation or the temperature variation meets the preset condition, so that in this step, whether a lightning strike actually occurs is further determined, and the confidence coefficient of the occurrence of a lightning strike of the corresponding type is finally obtained by calculating the weight and the confidence coefficient of each parameter by combining the current curve, the temperature variation curve, and the lightning strike type.
And step 140, judging whether the lightning stroke occurs or not based on the confidence coefficient.
When the confidence coefficient obtained by the calculation in the previous step exceeds a preset threshold value, the occurrence of the lightning stroke at the moment can be judged, and the type of the lightning stroke can be determined to be consistent with the type of the lightning stroke determined in the step 120.
According to the technical scheme of the embodiment, by acquiring the lightning current size change and the temperature change flowing on the OPGW optical cable, the misjudgment caused by the fact that the lightning current size or the temperature change is acquired independently can be avoided, and therefore the accuracy of judgment is further improved.
Example two
Fig. 2a is a flowchart of a lightning strike monitoring method for a power transmission line according to a second embodiment of the present invention, and fig. 2b is a structural diagram of a lightning strike monitor for a power transmission line according to a second embodiment of the present invention.
As shown in fig. 2b, the power transmission line lightning strike monitor comprises an optical host, an upper computer and an OPGW optical cable as a composite overhead ground wire. The optical host comprises a Raman scattering module (ROTDR), a polarization-sensitive Rayleigh scattering module (POTDR) and a wavelength division multiplexer.
Specifically, the raman scattering module (ROTDR) includes a pulse code modulator, a distributed feedback laser (DFB laser), an erbium-doped amplifier (EDFA1), a circulator, a filter, two photodetectors, and a data acquisition card. The distributed feedback laser (DFB laser) emits coded laser according to the coded signal to an erbium-doped amplifier (EDFA1), the coded laser enters a port 1 of the circulator after being amplified by the EDFA1 and is transferred to a port 2 in the circulator to be sent to the wavelength division multiplexer, meanwhile, the circulator transfers the signal received by the port 2 from the wavelength division multiplexer to a port 3 to be input into a filter to be filtered to leave stokes light and anti-stokes light, the stokes light and the anti-stokes light are respectively sent into a photoelectric detector to be converted into photoelectric signals, and the returned light signals are converted into electric signals which can be read by an upper computer through a data quantization acquisition card.
The polarization sensitive Rayleigh scattering module (POTDR) comprises an electro-optical modulator, a semiconductor Laser (LD), an erbium-doped amplifier (EDFA2), a distributed Raman amplifier (FRA), a polarizer, a circulator, a polarization beam splitter, two photoelectric detectors and a data acquisition card. The electro-optical modulator is used for loading electrical information on an optical carrier, so that optical parameters are changed along with the change of the electrical parameters, so that an optical wave is used as the carrier of the information, the semiconductor Laser (LD) is used for emitting a laser signal according to a signal from the electro-optical modulator, the erbium-doped amplifier (EDFA2) is used for amplifying the optical signal, the distributed Raman amplifier (FRA) is used for carrying out secondary amplification processing on the optical signal, the optical signal after secondary amplification enters the polarizer, the polarizer is used for adjusting the polarization state of the optical signal to be consistent, so that the polarization state of the output optical signal is unified, then the optical signal enters the port 1 of the circulator and is transferred to the port 2 in the circulator to be sent to the wavelength division multiplexer, meanwhile, the circulator transfers the signal received by the port 2 from the wavelength division multiplexer to the port 3 to be input to the polarization beam splitter to divide the received optical signal into o light and e light, and then, the o light and the e light are respectively input into the two photoelectric detectors and converted into electric signals, and the upper computer quantitatively reads the converted electric signals through a data acquisition card.
The wavelength division multiplexer is used for combining optical signals sent by the Raman scattering module (ROTDR) and the polarization sensitive Rayleigh scattering module (POTDR) and sending the optical signals to the interior of the OPGW optical cable, and decoupling the optical signals returned in the OPGW and respectively sending the optical signals to the Raman scattering module (ROTDR) and the polarization sensitive Rayleigh scattering module (POTDR) for photoelectric conversion.
The Raman amplifier utilizes the stimulated Raman scattering principle, and when signal light with weak power and Raman pump light with strong power are transmitted in the optical fiber at the same time, as long as the frequency of the weak signal light is within the gain bandwidth of the Raman pump light, the weak signal light can receive the amplification effect. The purpose of the two-stage amplification of the signal light is to increase the monitoring distance. Both o and e light are linearly polarized light, but their polarization directions are different. The o light is ordinary light, and the refractive index of the light is fixed and unchanged when the light propagates in the crystal; e light is light that vibrates perpendicular to o light because its vibration direction is perpendicular to o light, resulting in different refractive indices when propagating in different directions.
The method specifically comprises the following steps:
step 201, collecting first characteristic information of the reverse Rayleigh scattering light scattered and returned by the OPGW optical cable.
Rayleigh scattering is an optical phenomenon, and is one case of scattering. When the particle size is much smaller than the wavelength of the incident light (less than one tenth of the wavelength), the intensity of the scattered light in each direction is different, the intensity of the scattered light is inversely proportional to the fourth power of the wavelength of the incident light, this phenomenon is called rayleigh scattering, and the degree of the scattered light in the forward and reverse directions of the light is the same. Meanwhile, the Rayleigh scattering light is sensitive to an electromagnetic field outside the OPGW optical cable, and the polarization state of the Rayleigh scattering light can be changed under the action of the Faraday effect, so that the change of the electromagnetic field outside the OPGW optical cable can be judged according to the change of the polarization state of the Rayleigh scattering light, and the current magnitude loaded on the OPGW optical cable, namely the lightning current magnitude in the embodiment of the invention, can be further known.
In the embodiment of the present invention, the reverse rayleigh scattered light, which is transmitted back to the polarization-sensitive rayleigh scattering module (POTDR) in the reverse direction of the input light in the rayleigh scattering due to the local fluctuation change of the refractive index caused by the random fluctuation of the optical fiber density, is mainly collected. The reverse Rayleigh scattered light is converted into an electric signal through the photoelectric detector, and the electric signal is quantitatively acquired through the data acquisition card, so that the data can be read and called by an upper computer conveniently.
The first characteristic information of the reverse rayleigh scattering light may include a receiving time of the reverse rayleigh scattering light, light intensity information, and polarization state information, and the light intensity information and the polarization state information may be converted into corresponding electrical signals by the photodetector.
Step 202, collecting second characteristic information of the back Raman scattering light scattered and returned by the OPGW optical cable.
Raman scattering is a light scattering technique, which refers to scattering in which the frequency of light changes due to the interaction between incident light and molecular motion when the light passes through a medium, and is also called the raman effect. And the Raman scattering is sensitive to the temperature change of the OPGW optical cable, and due to the thermal vibration of optical fiber molecules in the OPGW optical cable easily caused by the temperature change, the reverse Raman scattering light is composed of two lights with different wavelengths, namely anti-Stokes (anti-Stokes) light and Stokes (Stokes) light, the former is particularly sensitive to the temperature, and the latter has a small relation with the temperature. The optical fiber is influenced by the external temperature, so that the light intensity of anti-Stokes light in the optical fiber is changed, the temperature difference between the Stokes light and the anti-Stokes light provides absolute indication of the temperature, and the distributed measurement of the temperature field of the OPGW optical cable can be realized by utilizing the principle.
The second characteristic information for the reverse raman scattering light in the embodiment of the present invention may include a reception time of the reverse raman scattering light, light intensity information, light frequency, and the like, and the light intensity information and the light frequency may be converted into corresponding electrical signals by the photodetector.
And 203, acquiring a current curve of the lightning stroke current of the OPGW optical cable based on the first characteristic information.
In a specific implementation, the reverse rayleigh scattering light is sensitive to an electromagnetic field acting outside the OPGW optical cable, and the polarization state of the reverse rayleigh scattering light is changed under the action of the faraday effect, so that the magnitude of the lightning current attached to the OPGW optical cable can be calculated according to the change of the polarization state of the reverse rayleigh scattering light. And the distance between the position where the polarization state changes and the optical host can be calculated according to the attenuation of the reverse Rayleigh scattering light, so that the lightning stroke position of the OPGW optical cable and the change relation between the lightning stroke current and the time are obtained, and the required current curve between the lightning stroke current and the time of the OPGW optical cable is obtained.
In an alternative embodiment, the first characteristic information includes at least a first receiving time and a polarization angle of the reverse rayleigh scattered light, and step 203 may include:
step 2031, calculating the lightning stroke point distance d of the OPGW optical cable by using the formula (1).
Where c is the speed of light, t1For the first receive time, n is the refractive index of the OPGW cable.
The distance between the lightning stroke point and the optical host can be calculated and obtained through the formula (1).
Step 2032, calculating lightning strike current I of the OPGW optical cable by using the formulas (2) and (3):
I＝σBS (3)
wherein θ is a polarization angle, V is a verdet constant, B is an electric field intensity of a lightning strike point, σ is an electric conductivity of the OPGW optical cable, and S is a cross-sectional area of the OPGW optical cable.
The electric field intensity at the lightning stroke point can be calculated and obtained through the formula (2), and then the current flowing on the OPGW optical cable after the lightning stroke can be obtained through conversion through the formula (3).
Step 2033, generating a current curve of the lightning strike current of the OPGW optical cable based on the lightning strike current and the first receiving time.
And calculating the size of the lightning current on the OPGW optical cable in the steps, and drawing and generating a current curve of the lightning current and the time of the OPGW optical cable by combining the lightning current with the first receiving time in the step.
And 204, acquiring a temperature change curve of the OPGW optical cable based on the second characteristic information.
In a specific implementation, the second characteristic information includes stokes light frequency and anti-stokes light frequency of the reverse raman scattering light, and the second receiving time. The reverse Raman scattering light is composed of two kinds of light with different wavelengths, namely anti-Stokes light and Stokes light, wherein the former is particularly sensitive to temperature, and the latter has a small relation with the temperature. The optical fiber is influenced by the external temperature, so that the anti-Stokes light intensity in the optical fiber is changed, the temperature difference between the Stokes light and the anti-Stokes light provides absolute temperature indication, the distributed measurement of the temperature field of the OPGW optical cable can be realized by utilizing the principle, and the temperature change of the OPGW optical cable is further determined according to the measured temperature.
In one possible embodiment, step 204 may include:
2041, calculating the lightning stroke point distance d of the OPGW optical cable by using a formula (4);
where c is the speed of light, t2For the second receive time, n is the refractive index of the OPGW cable.
The manner of calculating the distance to the lightning strike point is consistent with step 2031 above. The distance of the lightning strike point may also be determined in other ways in other embodiments, for example by calculating the distance of the lightning strike point through attenuation of the optical signal.
Step 2042, calculating the ratio R (T) of the Stokes light to the anti-Stokes light by using the formula (5):
where h is Planckian constant, k is Boltzmann constant, Δ v is Raman frequency shift, T is absolute temperature, v isASIs the Stokes light frequency, vSIs the anti-stokes optical frequency.
Step 2043, determining the temperature value of the OPGW optical cable based on the ratio.
In the previous step, the ratio of the stokes light which is not sensitive to the temperature and the anti-stokes light which is sensitive to the temperature is obtained through calculation, and the ratio is in positive correlation with the temperature, so that the actual temperature value of the OPGW optical cable can be calculated.
And 2044, generating a temperature change curve of the OPGW optical cable based on the second receiving time and the temperature value.
And drawing and obtaining a temperature change curve of the OPGW optical cable based on the second receiving time obtained in the previous step and the calculated temperature value of the OPGW optical cable.
And step 205, acquiring the wave front time, the half-peak time, the current amplitude and the oscillation period of the lightning current based on the current curve.
Wherein, the wave front time refers to the lightning impulse wave front time which is 1.67 times of the time interval T between 30% peak and 90% peak of the lightning strike current, namely T1. If there is oscillation in the wavefront, an average curve of the oscillating wave is first made, and then the point at which the 30% peak corresponds to the 90% peak time is determined. The half-peak time is the time interval between the apparent origin of the lightning current, which is the time leading by 0.3T1 corresponding to 30% of the peak time, and the instant when the voltage drops to half the peak value. The current amplitude is the current magnitude, and the oscillation period is the current fluctuation period.
And step 206, determining the temperature variation of the OPGW optical cable based on the temperature variation curve.
And step 207, determining the lightning stroke type according to the wave front time, the half-peak time, the current amplitude, the oscillation period and the temperature variation.
For example, if the wave front time falls within a preset first wave front range, the half-peak time falls within a preset first peak range, the current amplitude falls within a preset first amplitude range, and the temperature variation falls within a preset first temperature range, it is determined that the lightning type is the lightning OPGW optical cable;
if the oscillation period falls into a preset first period, the current amplitude falls into a preset second amplitude range, and the temperature variation falls into a preset second temperature range, determining that the lightning stroke type is the lightning stroke tower;
and if the oscillation period falls into a preset second period, the current amplitude falls into a preset third amplitude range and the temperature variation falls into a preset third temperature range, determining that the lightning stroke type is a lightning shielding failure wire.
And step 208, normalizing the wavefront time, the half-peak time, the current amplitude, the oscillation period and the temperature variation.
The wavefront time, half-peak time, current amplitude, oscillation period and temperature variation are consistent with those obtained in the previous step, where the above parameters are normalized for subsequent calculation. Normalization is a simplified calculation mode, namely, a dimensional expression is transformed into a dimensionless expression to become a scalar.
In an optional embodiment, the temperature characteristic and the current signal characteristic during lightning strike can be selected as index quantities for evaluation, and normalization processing can be performed by using the following formula (6) for the temperature characteristic and the following formula (7) for the current signal characteristic.
Wherein x is the feature quantity after normalization, x ' is the feature value before normalization, and maxx ' and minx ' are the maximum value and the minimum value of the artificially specified index.
And step 209, determining the weight by using an entropy weight method based on the normalized wave front time, half peak time, current amplitude, oscillation period and temperature variation.
Where entropy is a measure of uncertainty. The larger the uncertainty is, the larger the entropy is, and the larger the amount of information contained; the smaller the uncertainty, the smaller the entropy and the smaller the amount of information contained. According to the characteristics of entropy, the randomness and the disorder degree of an event can be judged by calculating the entropy, or the dispersion degree of a certain index can be judged by using the entropy, and the larger the dispersion degree of the index is, the larger the influence (weight) of the index on comprehensive evaluation is. For example, if the values of the sample data are all equal under a certain index, the influence of the index on the overall evaluation is 0, and the weight is 0. The entropy weight method is an objective weighting method because it relies only on the discreteness of the data itself.
In an alternative embodiment, the entropy of the ith fuzzy relation evaluation index is defined as:
where n is the number of data of a certain index, xijAnd normalizing the value of certain index data. H is belonged to [0,1 ]]And stipulate when fijWhen equal to 0, fij ln fij0. Accordingly, the entropy weight of the ith index is defined as:
wherein w is more than or equal to 0iIs less than or equal to 1, and
step 210, modifying the weight by using a variable weight formula:
wherein
Is a constant weight value, xjAre evaluation values corresponding to the wavefront time, half-peak time, current amplitude, oscillation period, and temperature change amount.
In the evaluation of lightning stroke judgment, the greater the deviation degree of an index from a normal value, the greater the proportion of the value in state evaluation, so a variable weight formula is introduced to further improve the judgment accuracy.
And step 211, calculating the confidence degree of the lightning stroke corresponding to the lightning stroke type based on the weight.
And step 212, judging whether the lightning stroke occurs or not based on the confidence coefficient.
When the calculated confidence is greater than the preset threshold, it is considered that the lightning stroke of the lightning stroke type determined in step 207 is occurring at this time.
EXAMPLE III
Fig. 3 is a structural diagram of a lightning strike monitoring device for a power transmission line according to a third embodiment of the invention. The device includes: an acquisition module 301, a determination module 302, a calculation module 303 and a judgment module 304. Wherein:
the acquisition module 301 is configured to acquire a current curve of lightning strike current flowing on the OPGW optical cable and a temperature change curve of the OPGW optical cable;
a determining module 302, configured to determine a lightning stroke type according to the current curve and the temperature variation curve;
the calculation module 303 is configured to determine a confidence level of the occurrence of the lightning stroke according to the current curve, the temperature change curve, and the lightning stroke type;
and the judging module 304 is used for judging whether the lightning stroke occurs or not based on the confidence coefficient.
The acquisition module 301 includes:
the first acquisition sub-module is used for acquiring first characteristic information of the reverse Rayleigh scattering light scattered and returned by the OPGW optical cable;
the second acquisition sub-module is used for acquiring second characteristic information of the reverse Raman scattering light scattered and returned by the OPGW optical cable;
the first generation submodule is used for acquiring a current curve of lightning stroke current of the OPGW optical cable based on the first characteristic information;
and the second generation submodule is used for acquiring the temperature change curve of the OPGW optical cable based on the second characteristic information.
The first characteristic information comprises a first receiving time and a polarization angle of the reverse Rayleigh scattering light;
the first generation submodule includes:
a first calculating unit, configured to calculate a lightning strike point distance d of the OPGW optical cable by using the following formula:
where c is the speed of light, t1For a first receive time, n is the refractive index of the OPGW optical cable;
a second calculating unit, configured to calculate a lightning strike current I of the OPGW optical cable by using the following formula:
I＝σBS
wherein theta is a polarization angle, V is a Verdet constant, B is an electric field intensity of a lightning stroke point, sigma is the conductivity of the OPGW optical cable, and S is the cross-sectional area of the OPGW optical cable;
a first generating unit for generating a current profile of the lightning strike current of the OPGW optical cable based on the lightning strike current and the first reception time.
The second characteristic information comprises a Stokes light frequency and an anti-Stokes light frequency of the reverse Raman scattering light and a second receiving time;
the second generation submodule includes:
a third calculating unit, configured to calculate a lightning strike point distance d of the OPGW optical cable by using the following formula:
where c is the speed of light, t2For the second receive time, n is the refractive index of the OPGW optical cable;
a fourth calculation unit for calculating a ratio r (t) of the stokes light to the anti-stokes light using the following formula:
where h is Planckian constant, k is Boltzmann constant, Δ v is Raman frequency shift, T is absolute temperature, v isASIs the Stokes light frequency, vSIs the anti-stokes optical frequency;
a fifth calculating unit, configured to determine a temperature value of the OPGW optical cable based on the ratio;
and the second generating unit is used for generating a temperature change curve of the OPGW optical cable based on the second receiving time and the temperature value.
The determination module 302 includes:
the first obtaining submodule is used for obtaining the wave front time, the half peak time, the current amplitude and the oscillation period of the lightning current based on the current curve;
the first determining submodule is used for determining the temperature variation of the OPGW optical cable based on the temperature variation curve;
if the wave front time falls into a preset first wave front range, the half-peak time falls into a preset first peak range, the current amplitude falls into a preset first amplitude range, and the temperature variation falls into a preset first temperature range, determining the lightning type as a lightning OPGW optical cable;
if the oscillation period falls into a preset first period, the current amplitude falls into a preset second amplitude range, and the temperature variation falls into a preset second temperature range, determining that the lightning stroke type is the lightning stroke tower;
and if the oscillation period falls into a preset second period, the current amplitude falls into a preset third amplitude range and the temperature variation falls into a preset third temperature range, determining that the lightning stroke type is a lightning shielding failure wire.
The calculation module 303 includes:
the second obtaining submodule is used for obtaining the wave front time, the half-peak time, the current amplitude and the oscillation period of the lightning current according to the current curve;
the second determining submodule determines the temperature variation of the OPGW optical cable based on the temperature variation curve;
the normalization submodule is used for performing normalization processing on the wavefront time, the half-peak time, the current amplitude, the oscillation period and the temperature variation;
the entropy weight module is used for determining the weight by using an entropy weight method based on the normalized wave front time, the normalized half-peak time, the normalized current amplitude, the normalized oscillation period and the normalized temperature variation;
and the confidence submodule is used for calculating the confidence coefficient of the lightning stroke occurrence corresponding to the lightning stroke type based on the weight.
Further comprising:
and the correction submodule is used for correcting the weight by using the following variable weight formula:
wherein
Is a constant weight value, xjAre evaluation values corresponding to the wavefront time, half-peak time, current amplitude, oscillation period, and temperature change amount.
Example four
Fig. 4 is a schematic structural diagram of a lightning strike monitoring device for a power transmission line according to a fourth embodiment of the present invention. As shown in fig. 4, the electronic apparatus includes a processor 40, a memory 41, a communication module 42, an input device 43, and an output device 44; the number of the processors 40 in the electronic device may be one or more, and one processor 40 is taken as an example in fig. 4; the processor 40, the memory 41, the communication module 42, the input device 43 and the output device 44 in the electronic device may be connected by a bus or other means, and the bus connection is exemplified in fig. 4.
The memory 41 is a computer-readable storage medium, and can be used for storing software programs, computer-executable programs, and modules, such as the modules corresponding to the transmission line lightning strike monitoring method in the embodiment (for example, the acquisition module 301, the determination module 302, the calculation module 303, and the judgment module 304 in a transmission line lightning strike monitoring apparatus). The processor 40 executes various functional applications and data processing of the electronic device by executing software programs, instructions and modules stored in the memory 41, so as to implement the above-mentioned lightning strike monitoring method for the power transmission line.
The memory 41 may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function; the storage data area may store data created according to use of the electronic device, and the like. Further, the memory 41 may include high speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid state storage device. In some examples, memory 41 may further include memory located remotely from processor 40, which may be connected to the electronic device through a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
And the communication module 42 is used for establishing connection with the display screen and realizing data interaction with the display screen. The input device 43 may be used to receive input numeric or character information and generate key signal inputs related to user settings and function controls of the electronic apparatus.
The power transmission line lightning strike monitoring device provided by the embodiment can execute the power transmission line lightning strike monitoring method provided by any embodiment of the invention, and has corresponding functions and beneficial effects.
EXAMPLE five
Fifth, an embodiment of the present invention further provides a storage medium containing computer-executable instructions, where the computer-executable instructions are executed by a computer processor to perform a method for monitoring lightning strikes on a power transmission line, where the method includes:
collecting a current curve of lightning stroke current flowing on the OPGW optical cable and a temperature change curve of the OPGW optical cable;
determining the type of lightning stroke according to the current curve and the temperature change curve;
determining the confidence coefficient of the lightning stroke according to the current curve, the temperature change curve and the lightning stroke type;
and judging whether the lightning stroke occurs or not based on the confidence coefficient.
Of course, the storage medium provided by the embodiments of the present invention includes computer-executable instructions, and the computer-executable instructions are not limited to the operations of the method described above, and may also perform related operations in a lightning strike monitoring method for a power transmission line provided by any embodiment of the present invention.
From the above description of the embodiments, it is obvious for those skilled in the art that the present invention can be implemented by software and necessary general hardware, and certainly, can also be implemented by hardware, but the former is a better embodiment in many cases. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which can be stored in a computer-readable storage medium, such as a floppy disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a FLASH Memory (FLASH), a hard disk or an optical disk of a computer, and includes instructions for enabling a computer electronic device (which may be a personal computer, a server, or a network electronic device) to execute the methods according to the embodiments of the present invention.
It should be noted that, in the embodiment of the above power transmission line lightning strike monitoring device, each included unit and module are only divided according to functional logic, but are not limited to the above division, as long as corresponding functions can be implemented; in addition, specific names of the functional units are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present invention.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. A lightning stroke monitoring method for a power transmission line is characterized by comprising the following steps:
collecting a current curve of lightning stroke current flowing on an OPGW optical cable and a temperature change curve of the OPGW optical cable;
determining the type of lightning stroke according to the current curve and the temperature change curve;
determining the confidence coefficient of the occurrence of the lightning stroke according to the current curve, the temperature change curve and the lightning stroke type;
and judging whether the lightning stroke occurs or not based on the confidence coefficient.
2. The method according to claim 1, wherein the collecting a current curve of a lightning strike current flowing on the OPGW optical cable and a temperature change curve of the OPGW optical cable comprises:
collecting first characteristic information of reverse Rayleigh scattering light scattered and returned by the OPGW optical cable;
collecting second characteristic information of the reverse Raman scattering light scattered and returned by the OPGW optical cable;
acquiring a current curve of lightning stroke current of the OPGW optical cable based on the first characteristic information;
and acquiring a temperature change curve of the OPGW optical cable based on the second characteristic information.
3. The power transmission line lightning strike monitoring method of claim 2, wherein the first characteristic information includes a first reception time and a polarization angle of the reverse rayleigh scattered light;
the obtaining of the current curve of the lightning strike current of the OPGW optical cable based on the first characteristic information comprises:
calculating the lightning stroke point distance d of the OPGW optical cable by using the following formula:
where c is the speed of light, t1For the first receive time, n is the refractive index of the OPGW optical cable;
calculating lightning stroke current I of the OPGW optical cable by using the following formula:
I＝σBS
wherein theta is a polarization angle, V is a Verdet constant, B is an electric field intensity of a lightning stroke point, sigma is the conductivity of the OPGW optical cable, and S is the cross-sectional area of the OPGW optical cable;
generating a current profile of a lightning strike current of the OPGW optical cable based on the lightning strike current and the first receive time.
4. The lightning strike monitoring method for the power transmission line according to claim 2, wherein the second characteristic information includes a stokes light frequency and an anti-stokes light frequency of the reverse raman scattering light, and a second receiving time;
the obtaining of the temperature change curve of the OPGW optical cable based on the second characteristic information includes:
calculating the lightning stroke point distance d of the OPGW optical cable by using the following formula:
where c is the speed of light, t2For the second receive time, n is the refractive index of the OPGW optical cable;
calculating a ratio R (T) of the Stokes light and the anti-Stokes light using the following formula:
where h is Planckian constant, k is Boltzmann constant, Δ v is Raman frequency shift, T is absolute temperature, v isASIs the Stokes light frequency, vSIs the anti-stokes optical frequency;
determining a temperature value for the OPGW optical cable based on the ratio;
and generating a temperature change curve of the OPGW optical cable based on the second receiving time and the temperature value.
5. The method for monitoring the lightning strike on the power transmission line according to claim 1, wherein the step of determining the type of the lightning strike according to the current curve and the temperature change curve comprises the following steps:
acquiring the wave front time, half-peak time, current amplitude and oscillation period of the lightning current based on the current curve;
determining the temperature variation of the OPGW optical cable based on the temperature variation curve;
if the wave front time falls into a preset first wave front range, the half-peak time falls into a preset first peak range, the current amplitude falls into a preset first amplitude range, and the temperature variation falls into a preset first temperature range, determining that the lightning stroke type is lightning stroke of the OPGW optical cable;
if the oscillation period falls into a preset first period, the current amplitude falls into a preset second amplitude range, and the temperature variation falls into a preset second temperature range, determining that the lightning stroke type is a lightning stroke tower;
and if the oscillation period falls into a preset second period, the current amplitude falls into a preset third amplitude range, and the temperature variation falls into a preset third temperature range, determining that the lightning stroke type is a lightning shielding failure wire.
6. The method for monitoring lightning strike on power transmission line according to claim 1, wherein the determining the confidence level of the occurrence of the lightning strike according to the current curve, the temperature change curve and the type of the lightning strike comprises:
acquiring the wave front time, half peak time, current amplitude and oscillation period of the lightning current according to the current curve;
determining the temperature variation of the OPGW optical cable based on the temperature variation curve;
normalizing the wavefront time, the half-peak time, the current amplitude, the oscillation period and the temperature variation;
determining a weight by an entropy weight method based on the normalized wavefront time, the half-peak time, the current amplitude, the oscillation period and the temperature variation;
calculating a confidence of occurrence of a lightning strike corresponding to the lightning strike type based on the weight.
7. The lightning strike monitoring method for the power transmission line according to claim 6, wherein after determining the weight based on the normalized wave front time, the half-peak time, the current amplitude, the oscillation period and the temperature variation by using an entropy weight method, the method further comprises:
the weights are modified using the following variable weight formula:
wherein
Is a constant weight value, xjIs an evaluation value corresponding to the wavefront time, the half-peak time, the current amplitude, the oscillation period, and the temperature change amount.
8. The utility model provides a transmission line monitoring devices that is struck by lightning which characterized in that includes:
the system comprises an acquisition module, a control module and a control module, wherein the acquisition module is used for acquiring a current curve of lightning strike current flowing on an OPGW optical cable and a temperature change curve of the OPGW optical cable;
the determining module is used for determining the type of lightning stroke according to the current curve and the temperature change curve;
the calculation module is used for determining the confidence coefficient of the occurrence of the lightning stroke according to the current curve, the temperature change curve and the lightning stroke type;
and the judging module is used for judging whether the lightning stroke occurs or not based on the confidence coefficient.
9. The utility model provides a transmission line thunderbolt monitoring facilities which characterized in that, equipment includes:
one or more processors;
a storage device for storing one or more programs,
when executed by the one or more processors, cause the one or more processors to implement the method of transmission line lightning strike monitoring according to any one of claims 1-7.
10. A storage medium containing computer executable instructions for performing the method of transmission line lightning strike monitoring according to any one of claims 1 to 7 when executed by a computer processor.
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