CN115128703A - Icing monitoring method for electrified railway contact net based on freezing environment atmospheric parameters - Google Patents
Icing monitoring method for electrified railway contact net based on freezing environment atmospheric parameters Download PDFInfo
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 43
- 230000008014 freezing Effects 0.000 title claims abstract description 36
- 238000007710 freezing Methods 0.000 title claims abstract description 36
- 239000011248 coating agent Substances 0.000 claims abstract description 20
- 238000000576 coating method Methods 0.000 claims abstract description 20
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- 238000005859 coupling reaction Methods 0.000 claims description 11
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60M—POWER SUPPLY LINES, AND DEVICES ALONG RAILS, FOR ELECTRICALLY- PROPELLED VEHICLES
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60M—POWER SUPPLY LINES, AND DEVICES ALONG RAILS, FOR ELECTRICALLY- PROPELLED VEHICLES
- B60M1/00—Power supply lines for contact with collector on vehicle
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Abstract
The invention discloses an icing monitoring method for an electrified railway contact net based on freezing environment atmospheric parameters, which comprises the following steps: step 1, selecting atmospheric parameters of a freezing environment to be detected according to monitoring requirements; step 2, measuring atmospheric parameters of an icing area of an electrified railway contact network; step 3, enabling the physical model of the electrified railway contact network to be equivalent to a two-dimensional model; step 4, constructing an electrified railway contact net icing area monitoring functional model based on freezing environment atmospheric parameters; step 5, building a multidimensional icing shape model of the electrified railway contact network under the icing condition; step 6, optimizing the icing quality and density function of the electrified railway contact network according to the real-time atmospheric icing parameters, and calculating the icing result of the whole electrified railway contact network; the method solves the technical problems that the ice coating monitoring on the contact network of the electrified railway is lacked, the normal operation and real-time on-line monitoring of the electrified railway are difficult to ensure in winter, the ice coating accident of the rail transit is difficult to timely handle and the like in the prior art.
Description
Technical Field
The invention belongs to the technical field of icing monitoring of an electrified railway contact network, and particularly relates to an icing monitoring method of the electrified railway contact network based on atmospheric parameters of a freezing environment.
Background
In recent years, with further expansion of rail transit construction, especially continuous expansion of electrified railways, in high-altitude and high-cold areas and in microtopography and microclimate ice-covered areas at low latitudes, electrified railway contact networks are easily affected by ice-covering, the problem of ice-covering of the electrified railway contact networks can destroy the safety and stability of the transportation industry, cause unstable railway power supply, even direct power failure, endanger the power supply circuit of the whole electrified railway, and seriously cause train shutdown or personal safety accidents. In addition, icing of the electrified railway contact network can also cause local paralysis of a power grid, power supply fluctuation of the whole power system is caused, industrial production and the life quality of people are influenced, the online monitoring of the icing area of the electrified railway contact network can effectively prevent ice disasters of lines, and the safety and the stability of traffic environments are guaranteed.
Icing of a contact network of an electrified railway relates to a complex cross fusion process of multiple physical and mathematical disciplines such as hydrodynamics, aerodynamics, thermodynamics and the like, but the prior art lacks a method for monitoring the icing of the contact network of the electrified railway, so that the normal operation and real-time online monitoring of the electrified railway are difficult to ensure in winter, and the icing accident of rail transit is difficult to deal with in time.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the method for monitoring the icing of the electrified railway contact network based on the atmospheric parameters of the freezing environment is provided, and the technical problems that the icing monitoring of the electrified railway contact network is lacked, the normal operation and the real-time online monitoring of the electrified railway are difficult to ensure in winter, the icing accident of the rail transit is difficult to deal with in time and the like in the prior art are solved.
The technical scheme of the invention is as follows:
an icing monitoring method for an electrified railway contact network based on freezing environment atmospheric parameters comprises the following steps:
step 1, selecting atmospheric parameters of a freezing environment to be detected according to monitoring requirements;
step 2, measuring atmospheric parameters of an icing area of an electrified railway contact network;
step 3, enabling the physical model of the electrified railway contact network to be equivalent to a two-dimensional model;
step 5, building a multidimensional icing shape model of the electrified railway contact network under the icing condition;
and 6, optimizing the icing quality and density function of the electrified railway contact network according to the real-time atmospheric icing parameters, and calculating the icing result of the whole electrified railway contact network.
Step 1, the atmospheric parameters of the freezing environment to be detected comprise: liquid water content, water drop median volume diameter, ambient temperature and ambient wind speed and direction.
Measuring the liquid water content w (t) at the ambient temperature, the median volume diameter a (t) of water drops, the ambient temperature T (t) and the ambient wind speed v (t) by a thermometer, an anemometer, an air gauge and an atmospheric data tester;
the method for enabling the physical model of the electrified railway contact network to be equivalent to the two-dimensional model comprises the following steps: performing two-dimensional equivalent processing on a physical model of an electrified railway contact network, extracting and modeling a single electrified railway transmission wire in comsol software, and performing grid division on the model by adopting a geometric partitioning method; and meanwhile, processing a contact network formed by each lead into a two-dimensional ice-coated plane model, and respectively carrying out ice shape simulation on the ice-coated contact network of the electrified railway through a composite influence factor coefficient and an atmospheric coefficient.
The construction method of the icing zone monitoring functional model of the electrified railway contact network comprises the following steps: the method is characterized in that a mass function m of each single electrified railway transmission conductor, which is subjected to icing growth in a freezing environment, is calculated by an electrified railway contact network icing area monitoring functional model 1 (t) and icing thickness growth velocity v 1 And (t) carrying out coupling calculation on contact networks formed by all the wires to obtain a functional model H (t) for the growth of the icing zone of the contact network of the electrified railway.
The specific realization method of the functional model H (t) for the icing zone growth of the contact network of the electrified railway comprises the following steps: according to the ambient wind speed v (t), the median volume diameter a (t) of water drops and the mass function m of the ice coating growth of the single electrified railway transmission line in the freezing environment 1 (t) and the icing thickness growth velocity v 1 (t) calculating the icing function α 1 (t);
α 1 (t)＝f(v(t),a(t),m 1 (t),v 1 (t))
calculating to obtain the real-time icing weight m (t + delta t) of the electrified railway contact network:
m(t+Δt)＝m(t)+Δm(t)；
according to the ambient temperature T (t), the liquid water content w (t), the wind speed v (t) and the icing function alpha 1 (t) calculating the freezing coefficient alpha as a function 3 (t);
α 3 (t)＝f(T(t),w(t),v(t),α 1 (t))
calculating the coupling of contact networks formed by electrified railway wires to obtain a functional model H (t) of icing zone growth:
H(t)＝f(f(m(t+Δt),α 3 (t))。
the method for optimizing the icing quality and density function of the electrified railway contact network and calculating the icing result of the whole electrified railway contact network comprises the following steps: according to the environmental temperature T (t), the environmental wind speed v (t), the liquid water content w (t) and the water drop median volume diameter a (t) measured in real time, optimizing the icing quality and density function of the electrified railway contact net, calculating the icing quality of a single electrified railway, completing the calculation of the icing quality of the electrified railway contact net, and finally coupling all the ice coating growth ice shape simulation results obtained through distributed calculation to obtain the icing result of the whole electrified railway contact net.
The invention has the beneficial effects that:
according to the method, the icing change rule of the electric transmission line of the electrified railway, the movement track of water drops in a frozen atmosphere environment and the collision process of the water drops are researched, the physical model of the contact net of the electrified railway is equivalent to a two-dimensional model, and the icing coupling model is combined to realize accurate monitoring on the icing area of the contact net, so that the icing numerical calculation model of the grounding net of the electrified railway is constructed.
The method has the advantages that the icing quality and the density function of the electrified railway contact network are optimized, the real-time monitoring of the icing quality and the icing shape of the electrified railway contact network is realized, and the method has great significance for providing a decision basis for the operation scheme of the electrified railway contact network in the icing period and improving the stability of the electrified railway.
The method solves the technical problems that the ice coating monitoring on the contact network of the electrified railway is lacked, the normal operation and real-time on-line monitoring of the electrified railway are difficult to ensure in winter, the ice coating accident of the rail transit is difficult to timely handle and the like in the prior art.
Drawings
FIG. 1 is a flow chart of the present invention;
fig. 2 is a flow chart of ice coating calculation of an electrified railway contact network.
Detailed Description
The invention (see fig. 1) comprises the following steps:
s1, determining atmospheric parameters to be detected according to monitoring requirements;
specifically, the method comprises the following steps: according to a physical model of the icing development of the electrified railway contact network, firstly, an icing function and an icing weight increment are calculated, then, a freezing coefficient is calculated, a contact network coupling calculation formed by a plurality of electrified railway leads is calculated to obtain a functional model of the icing area growth, and then, an electrified railway contact network icing quality monitoring model is constructed. And at least 4 typically relevant environmental parameters including environmental temperature, wind speed and wind direction, liquid water content and water drop median volume diameter are needed for calculating the icing function, and because part of the parameters have relatively small influence on the monitoring result, in order to accelerate the calculation speed, simplified processing can be carried out, for example, the aerodynamic viscosity coefficient can be approximated to a constant value under the condition that the qualitative temperature change of a boundary layer is caused without considering temperature rise.
In addition, the icing area monitoring functional model of the electrified railway contact network needs to calculate the mass function m of icing growth of a plurality of single electrified railway transmission conductors in a freezing environment 1 (t) and the icing thickness growth velocity v 1 (t) obtaining the signals respectively by a multi-cylinder ice collector and an atmospheric parameter measuring instrument, and connecting a plurality of leadsAnd performing coupling calculation on the formed contact network to obtain a functional model H (t) of the increase of the icing zone of the contact network of the electrified railway. And (3) according to the atmospheric parameters of the freezing environment, combining the ice coating growth rule of the cylindrical conductor, and building a multidimensional icing shape model of the electrified railway contact net under the ice coating condition.
Further, different atmospheric parameters required by icing monitoring can be measured through different measuring equipment combinations. Further, the measuring device is not limited to: high accuracy thermometer, anemograph, air measuring apparatu and atmospheric data tester. Take an atmospheric data tester as an example. And (3) mounting and fixing the atmospheric data tester above or on the top of a tower near the overhead contact system of the electrified railway. By means of energy obtaining through ground wire, the contact net supplies power to the air data tester
S2, measuring atmospheric parameters of an icing area of an electrified railway contact network;
specifically, the method comprises the following steps: the actually measured environmental temperature T (t), the environmental wind speed v (t), the liquid water content w (t) and the median volume diameter a (t) of the water drops are collected respectively.
According to the method, most of meteorological parameters of the electrified railway contact net are counted and inspected, and the value ranges of the environmental temperature T, the environmental wind speed v, the liquid water content w and the water drop median diameter a are set as follows in order to improve the calculation efficiency by combining the actual ice coating condition of the rail transit contact net. The value range of the environmental temperature T is set to be-12-8 ℃, and the value precision is 0.3 ℃; the value range of the wind speed v is set to be 0-30 m/s, and the value precision is 0.4 m/s; the liquid water content w is set to be 0.1-2.4 g/m 3 The value precision is 0.25g/m 3 (ii) a The range of the water drop median volume diameter a is 10-100 mu m, and the value precision is 5 mu m. The coupling coefficient between two icing transmission conductors of the electrified railway contact net is 0.2-0.5, and the error caused by the two-dimensional equivalent physical model is ignored.
S3, the physical model of the electrified railway contact network is equivalent to a two-dimensional model;
specifically, the method comprises the following steps: the method comprises the steps of performing two-dimensional equivalent processing on a physical model of the electrified railway contact network, extracting and building a model from a single electrified railway transmission wire in comsol software, performing grid division on the model by adopting a geometric partitioning method, limiting the number of grids within 20 ten thousand, improving the calculation speed, ensuring the convergence of a calculation result, not influencing the accuracy of the model, and generating a two-dimensional ice-coated plane model from the contact network formed by each wire. The ice coating influence law in the freezing environment is mainly influenced by composite atmospheric influence factors, wherein the influence factors comprise temperature, humidity, wind speed, water molecule content in air and the like. The ice shape simulation can better reflect the ice coating growth form of the ice coating contact net of the electrified railway under different atmospheric parameter environments, and is beneficial to realizing timely ice coating on-line monitoring. The CFD (computational fluid dynamics) method based on ANSYS software is used for respectively carrying out ice shape simulation on the ice-coated contact net of the electrified railway through composite atmospheric influence factors.
S4, constructing an electrified railway contact net icing area monitoring functional model based on the atmospheric parameters of the freezing environment;
specifically, the method comprises the following steps: the method is characterized in that an icing area monitoring functional model of an electrified railway contact network needs to calculate a mass function m of icing growth of a plurality of single electrified railway transmission conductors in a freezing environment 1 (t) and the icing thickness growth velocity v 1 And (t) respectively obtaining the ice accretion by a multi-cylinder ice accretion device and an atmospheric parameter measuring instrument, and carrying out coupling calculation on a contact network consisting of a plurality of leads to obtain a functional model H (t) of the increase of the ice coating area of the contact network of the electrified railway.
The method specifically comprises the following steps: according to the ambient wind speed v (t), the median volume diameter a (t) of water drops and the mass function m of the ice coating growth of the single electrified railway transmission line in the freezing environment 1 (t) and the icing thickness growth velocity v 1 (t) calculating the icing function α 1 (t);
α 1 (t)＝f(v(t),a(t),m 1 (t),v 1 (t))
calculating to obtain the real-time icing weight m (t + delta t) of the electrified railway contact network:
m(t+Δt)＝m(t)+Δm(t)。
according to the ambient temperature T (t), the liquid water content w (t), the wind speed v (t) and the icing function alpha 1 (t) calculating the freezing coefficient alpha as a function 3 (t);
α 3 (t)＝f(T(t),w(t),v(t),α 1 (t))
and (4) obtaining an icing area growth functional model H (t) by the coupled calculation of a contact network consisting of a plurality of electrified railway wires.
H(t)＝f(f(m(t+Δt),α 3 (t))
S5, building a three-dimensional icing shape of the electrified railway contact net under the ice coating condition;
specifically, the method comprises the following steps: and similarly, based on a CFD (computational fluid dynamics) method of ANSYS software, processing a contact network formed by combining each wire into a two-dimensional icing plane model, and building a multi-dimensional icing shape model of the contact network of the electrified railway under an icing condition according to the atmospheric parameters (liquid water content, water drop median volume diameter, ambient temperature and ambient wind speed and direction) of a freezing environment.
And S6, optimizing the icing quality and density function of the electrified railway contact net according to the real-time atmospheric icing parameters.
Specifically, the method comprises the following steps: according to the data parameters measured in real time, the environmental temperature T (t), the environmental wind speed v (t), the liquid water content w (t) and the median volume diameter a (t) of water drops, the icing quality and the density function of the electrified railway contact net are optimized, the icing quality of a single electrified railway is calculated, the icing quality of the electrified railway contact net is calculated, and finally all the ice coating growth ice shape simulation results obtained through distributed calculation are coupled to obtain the icing result of the whole electrified railway contact net.
Claims (7)
1. A method for monitoring icing of an electrified railway contact net based on freezing environment atmospheric parameters is characterized by comprising the following steps: the method comprises the following steps:
step 1, selecting atmospheric parameters of a freezing environment to be detected according to monitoring requirements;
step 2, measuring atmospheric parameters of an icing area of an electrified railway contact network;
step 3, enabling the physical model of the electrified railway contact network to be equivalent to a two-dimensional model;
step 4, constructing an electrified railway contact net icing area monitoring functional model based on freezing environment atmospheric parameters;
step 5, building a multidimensional icing shape model of the electrified railway contact network under the icing condition;
and 6, optimizing the icing quality and density function of the electrified railway contact network according to the real-time atmospheric icing parameters, and calculating the icing result of the whole electrified railway contact network.
2. The icing monitoring method for the electrified railway contact network based on the atmospheric parameters of the freezing environment according to claim 1, characterized by comprising the following steps: step 1, the atmospheric parameters of the freezing environment to be detected comprise: liquid water content, water drop median volume diameter, ambient temperature and ambient wind speed and direction.
3. The icing monitoring method for the electrified railway contact network based on the atmospheric parameters of the freezing environment according to claim 2, characterized by comprising the following steps: the measurement of the ambient temperature liquid water content w (t), the water drop median volume diameter a (t), the ambient temperature t (t) and the ambient wind speed v (t) is realized by a thermometer, an anemometer, an air gauge and an atmospheric data tester.
4. The icing monitoring method for the electrified railway contact network based on the atmospheric parameters of the freezing environment according to claim 1, characterized by comprising the following steps: the method for enabling the physical model of the electrified railway contact network to be equivalent to the two-dimensional model comprises the following steps: performing two-dimensional equivalent processing on a physical model of an electrified railway contact network, extracting and modeling a single electrified railway transmission wire in comsol software, and performing grid division on the model by adopting a geometric partitioning method; and meanwhile, processing a contact network formed by each lead into a two-dimensional ice-coated plane model, and respectively carrying out ice shape simulation on the ice-coated contact network of the electrified railway through a composite influence factor coefficient and an atmospheric coefficient.
5. The icing monitoring method for the electrified railway contact network based on the atmospheric parameters of the freezing environment according to claim 1, characterized by comprising the following steps: the construction method of the icing zone monitoring functional model of the electrified railway contact network comprises the following steps: the method is characterized in that each single electrified railway transmission conductor needs to be calculated by an electrified railway contact network icing area monitoring functional modelMass function m of icing growth in freezing environment 1 (t) and the icing thickness growth velocity v 1 And (t) carrying out coupling calculation on contact networks formed by all the wires to obtain a functional model H (t) for the growth of the icing zone of the contact network of the electrified railway.
6. The icing monitoring method for the electrified railway contact net based on the atmospheric parameters of the freezing environment according to claim 5, characterized by comprising the following steps: the specific realization method of the functional model H (t) for the icing zone growth of the contact network of the electrified railway comprises the following steps: according to the ambient wind speed v (t), the median volume diameter a (t) of water drops and the mass function m of the ice coating growth of the single electrified railway transmission line in the freezing environment 1 (t) and the icing thickness growth velocity v 1 (t) calculating the icing function α 1 (t);
α 1 (t)＝f(v(t),a(t),m 1 (t),v 1 (t))
calculating to obtain the real-time icing weight m (t + delta t) of the electrified railway contact network:
m(t+Δt)＝m(t)+Δm(t)；
according to the ambient temperature T (t), the liquid water content w (t), the wind speed v (t) and the icing function alpha 1 (t) calculating the freezing coefficient alpha as a function 3 (t);
α 3 (t)＝f(T(t),w(t),v(t),α 1 (t))
calculating the coupling of contact networks formed by electrified railway wires to obtain a functional model H (t) of icing zone growth:
H(t)＝f(f(m(t+Δt),α 3 (t))。
7. the icing monitoring method for the electrified railway contact network based on the atmospheric parameters of the freezing environment according to claim 1, characterized by comprising the following steps: the method for optimizing the icing quality and density function of the electrified railway contact network and calculating the icing result of the whole electrified railway contact network comprises the following steps: according to the environment temperature T (t), the environment wind speed v (t), the liquid water content w (t) and the water drop median volume diameter a (t) measured in real time, optimizing the icing quality and density function of the electrified railway contact network, calculating the icing quality of a single electrified railway, completing the calculation of the icing quality of the electrified railway contact network, and finally coupling all the ice coating growth ice shape simulation results obtained by the dispersive calculation to obtain the whole icing result of the electrified railway contact network.
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2022
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