CN115128703B - Ice-coating monitoring method for overhead contact system of electrified railway based on atmospheric parameters of frozen environment - Google Patents
Ice-coating monitoring method for overhead contact system of electrified railway based on atmospheric parameters of frozen environment Download PDFInfo
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- CN115128703B CN115128703B CN202210926157.1A CN202210926157A CN115128703B CN 115128703 B CN115128703 B CN 115128703B CN 202210926157 A CN202210926157 A CN 202210926157A CN 115128703 B CN115128703 B CN 115128703B
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 40
- 238000000034 method Methods 0.000 title claims abstract description 29
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 33
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- 239000007788 liquid Substances 0.000 claims description 15
- 230000005540 biological transmission Effects 0.000 claims description 12
- 230000008878 coupling Effects 0.000 claims description 10
- 238000010168 coupling process Methods 0.000 claims description 10
- 238000005859 coupling reaction Methods 0.000 claims description 10
- 238000004088 simulation Methods 0.000 claims description 7
- 230000008014 freezing Effects 0.000 claims description 5
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- 239000002131 composite material Substances 0.000 claims description 3
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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
- B60M1/02—Details
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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
- B60M1/12—Trolley lines; Accessories therefor
- B60M1/28—Manufacturing or repairing trolley lines
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Abstract
The invention discloses an electrified railway overhead line system icing monitoring method based on frozen environment atmospheric parameters, which comprises the following steps: step 1, selecting atmospheric parameters of the frozen environment to be detected according to monitoring requirements; step 2, measuring atmospheric parameters of an ice-covered area of the overhead contact system of the electrified railway; step 3, equivalent of the physical model of the electrified railway contact network to a two-dimensional model; step 4, constructing an electrified railway overhead line system ice-covering area monitoring functional model based on the atmospheric parameters of the frozen environment; step 5, building a multidimensional icing shape model of the overhead line system of the electrified railway under the icing condition; step 6, optimizing the icing quality and the density function of the overhead contact system of the electrified railway according to the real-time atmospheric icing parameters, and calculating the icing result of the overhead contact system of the electrified railway; the technical problems that the prior art lacks of ice coating monitoring on an electrified railway contact net, normal operation of the electrified railway is difficult to ensure in winter, real-time online monitoring is difficult to treat ice coating accidents in rail transit in time and the like are solved.
Description
Technical Field
The invention belongs to the technical field of ice coating monitoring of overhead contact systems of electrified railways, and particularly relates to an ice coating monitoring method of overhead contact systems of electrified railways based on atmospheric parameters of frozen environments.
Background
In recent years, along with the further expansion of rail transit construction, particularly the continuous expansion of electrified railways, in high-latitude and high-cold areas and some low-latitude micro-terrain microclimate ice-covered areas, an electrified railway contact net is easily affected by ice-covered, the ice-covered problem of the electrified railway contact net can damage the safety stability of the transportation industry, unstable railway power supply is caused, even the direct power failure is caused, the power supply loop of the whole electrified rail is endangered, and train shutdown or personal safety accidents are caused in severe cases. In addition, the ice coating of the overhead contact system of the electrified railway can also cause local paralysis of a power grid, cause power supply fluctuation of the whole power system, influence the quality of life of industrial production and people, and effectively prevent the occurrence of line ice disaster by on-line monitoring of the ice coating area of the overhead contact system of the electrified railway, so that the safety and stability of traffic environment are ensured.
The electrified railway overhead line system icing relates to complex cross fusion processes of multiple physical and mathematical disciplines such as hydrodynamic, aerodynamic and thermodynamic, but the prior art lacks an electrified railway overhead line system icing monitoring method, so that normal operation and real-time online monitoring of an electrified railway are difficult to ensure in winter, and icing accidents of rail traffic are difficult to treat in time.
Disclosure of Invention
The invention aims to solve the technical problems that: the method for monitoring the ice coating of the overhead contact system of the electrified railway based on the atmospheric parameters of the frozen environment is provided to solve the technical problems that the existing technology lacks of monitoring the ice coating of the overhead contact system of the electrified railway, the normal operation of the electrified railway is difficult to ensure in winter, the real-time online monitoring is difficult to realize, the ice coating accident of the rail transit is difficult to treat in time, and the like.
The technical scheme of the invention is as follows:
an electrified railway overhead line system icing monitoring method based on frozen environment atmospheric parameters, the method comprising the following steps:
step 1, selecting atmospheric parameters of the frozen environment to be detected according to monitoring requirements;
step 2, measuring atmospheric parameters of an ice-covered area of the overhead contact system of the electrified railway;
step 3, equivalent of the physical model of the electrified railway contact network to a two-dimensional model;
step 4, constructing an electrified railway overhead line system ice-covering area monitoring functional model based on the atmospheric parameters of the frozen environment;
step 5, building a multidimensional icing shape model of the overhead line system of the electrified railway under the icing condition;
and 6, optimizing the icing quality and the density function of the overhead contact system of the electrified railway according to the real-time atmospheric icing parameters, and calculating the icing result of the overhead contact system of the electrified railway.
The atmospheric parameters of the frozen environment to be detected in the step 1 comprise: liquid water content, median volume diameter of water droplets, ambient temperature, and ambient wind speed and direction.
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 through a thermometer, an anemometer, an air measuring instrument and an atmosphere data tester;
the method for equivalent of the physical model of the electrified railway contact net into the two-dimensional model comprises the following steps: performing two-dimensional equivalent processing on a physical model of the electrified railway contact network, extracting and constructing a single electrified railway power transmission wire in comsol software, and performing grid division on the model by adopting a geometric segmentation method; and meanwhile, processing the overhead contact system formed by each wire into a two-dimensional icing plane model, and respectively performing ice shape simulation on the electrified railway icing overhead contact system through the composite influence factor coefficient and the atmospheric coefficient.
The construction method of the functional model for monitoring the ice-covered area of the overhead contact system of the electrified railway comprises the following steps: the functional model for monitoring the ice-covering area of the overhead contact system of the electrified railway is used for calculating the mass function m of ice-covering growth of each single electrified railway power transmission wire in the frozen environment 1 (t) speed v of increase in icing thickness 1 And (t) performing coupling calculation on the overhead contact system formed by the wires to obtain a functional model H (t) for the growth of the ice-covered area of the overhead contact system of the electrified railway.
The specific implementation method of the functional model H (t) for the growth of the ice-covered area of the overhead contact system 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 icing growth of a single electrified railway transmission conductor in a frozen environment 1 (t) speed v of increase in icing thickness 1 (t) calculating the icing function alpha 1 A function of (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 overhead contact system:
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) obtaining a function to calculate the freezing coefficient alpha 3 A function of (t);
α 3 (t)＝f(T(t),w(t),v(t),α 1 (t))
coupling calculation is carried out on the contact net formed by each electrified railway wire to obtain a functional model H (t) of the growth of the icing area:
H(t)＝f(f(m(t+Δt),α 3 (t))。
the method for optimizing the icing quality and the density function of the overhead contact system of the electrified railway and calculating the icing result of the overhead contact system of the whole electrified railway comprises the following steps: according to the real-time measured ambient temperature T (T), ambient wind speed v (T), liquid water content w (T) and water drop median volume diameter a (T), the ice coating quality and density function of the electrified railway overhead line system are optimized, the ice coating quality of a single electrified railway overhead line system is calculated, the ice coating quality calculation of the electrified railway overhead line system is completed, and finally all the ice coating growth ice simulation results obtained through the decentralized calculation are coupled to obtain the ice coating result of the whole electrified railway overhead line system.
The invention has the beneficial effects that:
according to the invention, through researching the icing change rule of a single electrified railway power transmission line, the movement track of water drops and the collision process of the water drops in the frozen atmospheric environment, the physical model of the electrified railway overhead line is equivalent to a two-dimensional model, and accurate monitoring is realized on the icing area of the contact network by combining with the icing coupling model, so that the icing numerical calculation model of the electrified railway grounding network is constructed.
The method optimizes the ice coating quality and the density function of the electrified railway overhead contact system, realizes the real-time monitoring of the ice coating quality and the ice shape of the electrified railway overhead contact system, and has great significance for providing a decision basis for the running scheme of the electrified railway overhead contact system in the ice coating period and improving the stability of the electrified railway.
The technical problems that the prior art lacks of ice coating monitoring on an electrified railway contact net, normal operation of the electrified railway is difficult to ensure in winter, real-time online monitoring is difficult to treat ice coating accidents in rail transit in time and the like are solved.
Drawings
FIG. 1 is a flow chart of the present invention;
fig. 2 is a flow chart of the calculation of the ice coating of the overhead contact system of the electrified railway.
Detailed Description
The invention (see fig. 1) comprises the following steps:
s1, determining atmospheric parameters to be detected according to monitoring requirements;
specifically: according to the method, according to a physical model of ice coating development of the electrified railway overhead line system, firstly, an icing function and an ice coating weight increment are calculated, then a freezing coefficient is calculated, an overhead line system coupling calculation formed by a plurality of electrified railway wires is calculated to obtain a functional model of ice coating area growth, and then an electrified railway overhead line system ice coating quality monitoring model is constructed. The icing function is calculated by at least 4 typically related environmental parameters including the environmental temperature, wind speed and direction, liquid water content and water drop median volume diameter, and since the influence of some parameters on the monitoring result is relatively small, in order to increase the calculation speed, the calculation can be simplified, for example, the aerodynamic coefficient of viscosity can be approximated to a fixed value under the condition of not considering qualitative temperature change of the boundary layer caused by temperature rise.
In addition, the monitoring functional model of the ice coating area of the overhead contact system of the electrified railway needs to calculate the mass function m of ice coating growth of a plurality of single electrified railway power transmission wires in a frozen environment 1 (t) speed v of increase in icing thickness 1 And (t) respectively obtaining by a multi-cylinder ice accumulator and an atmospheric parameter measuring instrument, and performing coupling calculation on the overhead line system formed by a plurality of wires to obtain a functional model H (t) for the growth of the ice-covered area of the overhead line system of the electrified railway. And building a multidimensional icing shape model of the overhead line system of the electrified railway under the icing condition according to the atmospheric parameters of the freezing environment and by combining the icing growth rule of the cylindrical lead.
Further, different atmospheric parameters required for ice coating monitoring can be measured by different combinations of measuring devices. Further, the measuring apparatus is not limited to only: high accuracy thermometer, anemometer, air gauge and atmospheric data tester. Taking an atmospheric data tester as an example. And installing and fixing the atmosphere data tester on the top of a pole tower above or nearby the electrified railway contact net. The contact net supplies power to the atmosphere data tester in an energy taking mode through the ground wire
S2, measuring the atmospheric parameters of an ice-covered area of the overhead contact system of the electrified railway;
specifically: the measured ambient temperature T (T), the ambient wind speed v (T), the liquid water content w (T) and the water drop median volume diameter a (T) are respectively collected.
According to the invention, most of meteorological parameters of the electrified railway overhead contact system are subjected to statistical investigation, and in combination with the actual situation of ice coating of the railway traffic overhead contact system, in order to improve the calculation efficiency, the values of the environment temperature T, the environment wind speed v, the liquid water content w and the water drop median diameter a are set as follows. The value range of the ambient temperature T is set at-12-8 ℃ and the value accuracy is 0.3 ℃; the value range of the wind speed v is set to be 0-30 m/s, and the value accuracy is 0.4m/s; the liquid water content w is set to be 0.1-2.4 g/m 3 The value accuracy is 0.25g/m 3 The method comprises the steps of carrying out a first treatment on the surface of the The median volume diameter a of the water drop is 10-100 mu m, and the value accuracy is 5 mu m. The coupling coefficient between two ice-covered power transmission wires of the electrified railway contact net is 0.2-0.5, and error quantity caused by a 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: and (3) carrying out two-dimensional equivalent processing on the physical model of the electrified railway overhead contact system, extracting and building a model of a single electrified railway power transmission wire in com software, carrying out grid division on the model by adopting a geometric segmentation method, limiting the number of grids within 20 ten thousand, improving the calculation speed, ensuring the convergence of the calculation result, simultaneously not affecting the accuracy of the model, and simultaneously generating a two-dimensional icing plane model of the overhead contact system formed by each wire. The ice coating influence law in the frozen environment is mainly influenced by a composite atmosphere influence factor, wherein the influence factor comprises temperature, humidity, wind speed, water molecular content in air and the like. The ice shape simulation can better reflect the ice coating growth form of the electrified railway ice coating contact net under different atmosphere parameter environments, and is beneficial to realizing timely online monitoring of ice coating. And (3) performing ice shape simulation on the electrified railway icing contact net by compounding the atmospheric influence factors according to a CFD (computational fluid dynamics) method based on ANSYS software.
S4, constructing an electrified railway overhead line system ice-covering area monitoring functional model based on the atmospheric parameters of the frozen environment;
specific: the functional model for monitoring the ice-covering area of the overhead contact system of the electrified railway needs to calculate the mass function m of ice-covering growth of a plurality of single electrified railway power transmission wires in a frozen environment 1 (t) speed v of increase in icing thickness 1 And (t) respectively obtaining by a multi-cylinder ice accumulator and an atmospheric parameter measuring instrument, and performing coupling calculation on the overhead line system formed by a plurality of wires to obtain a functional model H (t) for the growth of the ice-covered area of the overhead line system 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 icing growth of a single electrified railway transmission conductor in a frozen environment 1 (t) speed v of increase in icing thickness 1 (t) calculating the icing function alpha 1 A function of (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 overhead contact system:
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) obtaining a function to calculate the freezing coefficient alpha 3 A function of (t);
α 3 (t)＝f(T(t),w(t),v(t),α 1 (t))
and (3) calculating the coupling of the contact net formed by a plurality of electrified railway wires to obtain a functional model H (t) for the growth of the ice-covered area.
H(t)＝f(f(m(t+Δt),α 3 (t))
S5, building a three-dimensional icing shape of the overhead line system of the electrified railway under the icing condition;
specifically: and (3) processing the contact net formed by combining each wire into a two-dimensional icing plane model by using a CFD (computational fluid dynamics) method based on ANSYS software, and constructing a multidimensional icing shape model of the contact net of the electrified railway under the icing condition according to the atmospheric parameters (liquid water content, water drop median volume diameter, ambient temperature and ambient wind speed and direction) of the frozen environment.
S6, optimizing the ice coating quality and the density function of the overhead contact system of the electrified railway according to the real-time atmospheric ice coating parameters.
Specifically: 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 water drop median volume diameter a (T), the icing quality and the density function of the electrified railway overhead contact system are optimized, the icing quality of a single electrified railway overhead contact system is calculated, the icing quality calculation of the electrified railway overhead contact system is completed, and finally all the icing growth ice simulation results obtained through the decentralized calculation are coupled to obtain the whole electrified railway overhead contact system icing result.
Claims (4)
1. An electrified railway overhead contact system icing monitoring method based on frozen environment atmospheric parameters is characterized by comprising the following steps of: the method comprises the following steps:
step 1, selecting atmospheric parameters of the frozen environment to be detected according to monitoring requirements;
step 2, measuring atmospheric parameters of an ice-covered area of the overhead contact system of the electrified railway;
step 3, equivalent of the physical model of the electrified railway contact network to a two-dimensional model;
the method for equivalent of the physical model of the electrified railway contact net into the two-dimensional model comprises the following steps: performing two-dimensional equivalent processing on a physical model of the electrified railway contact network, extracting and constructing a single electrified railway power transmission wire in comsol software, and performing grid division on the model by adopting a geometric segmentation method; meanwhile, the overhead line system formed by each wire is processed into a two-dimensional icing plane model, and ice shape simulation is respectively carried out on the electrified railway icing overhead line system through a composite influence factor coefficient and an atmospheric coefficient;
step 4, constructing an electrified railway overhead line system ice-covering area monitoring functional model based on the atmospheric parameters of the frozen environment;
the construction method of the functional model for monitoring the ice-covered area of the overhead contact system of the electrified railway comprises the following steps: the functional model for monitoring the ice-covering area of the overhead contact system of the electrified railway is used for calculating the mass function m of ice-covering growth of each single electrified railway power transmission wire in the frozen environment 1 (t) speed v of increase in icing thickness 1 (t) coupling calculation is carried out on the overhead contact system formed by each wire to obtain the growth of the ice-covered area of the overhead contact system of the electrified railwayFunctional model H (t);
the specific implementation method of the functional model H (t) for the growth of the ice-covered area of the overhead contact system 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 icing growth of a single electrified railway transmission conductor in a frozen environment 1 (t) speed v of increase in icing thickness 1 (t) calculating the icing function alpha 1 A function of (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 overhead contact system:
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) obtaining a function to calculate the freezing coefficient alpha 3 A function of (t);
α 3 (t)＝f(T(t),w(t),v(t),α 1 (t))
coupling calculation is carried out on the contact net formed by each electrified railway wire to obtain a functional model H (t) of the growth of the icing area:
H(t)＝f(f(m(t+Δt),α 3 (t))；
step 5, building a multidimensional icing shape model of the overhead line system of the electrified railway under the icing condition;
and 6, optimizing the icing quality and the density function of the overhead contact system of the electrified railway according to the real-time atmospheric icing parameters, and calculating the icing result of the overhead contact system of the electrified railway.
2. The method for monitoring ice coating of an electrified railway overhead line system based on frozen environment atmospheric parameters according to claim 1, which is characterized by comprising the following steps: the atmospheric parameters of the frozen environment to be detected in the step 1 comprise: liquid water content, median volume diameter of water droplets, ambient temperature, and ambient wind speed and direction.
3. The method for monitoring ice coating of the overhead contact system of the electrified railway based on the atmospheric parameters of the frozen environment according to claim 2 is 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 through a thermometer, an anemometer, an air measuring instrument and an atmosphere data tester.
4. The method for monitoring ice coating of an electrified railway overhead line system based on frozen environment atmospheric parameters according to claim 1, which is characterized by comprising the following steps: the method for optimizing the icing quality and the density function of the overhead contact system of the electrified railway and calculating the icing result of the overhead contact system of the whole electrified railway comprises the following steps: according to the real-time measured ambient temperature T (T), ambient wind speed v (T), liquid water content w (T) and water drop median volume diameter a (T), the ice coating quality and density function of the electrified railway overhead line system are optimized, the ice coating quality of a single electrified railway overhead line system is calculated, the ice coating quality calculation of the electrified railway overhead line system is completed, and finally all the ice coating growth ice simulation results obtained through the decentralized calculation are coupled to obtain the ice coating result of the whole electrified railway overhead line system.
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| CN102721373A (en) * | 2012-06-26 | 2012-10-10 | 西安金源电气股份有限公司 | Online electrified railway overhead contact line icing monitoring system |
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| KR102136131B1 (en) * | 2020-02-04 | 2020-07-22 | 김용섭 | Automatic road ice prediction system and operation method of the Same |
| CN113836730A (en) * | 2021-09-28 | 2021-12-24 | 国网重庆市电力公司电力科学研究院 | Method for calculating diameter of rotating multi-circle conductor for icing monitoring |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| FI125286B (en) * | 2011-07-01 | 2015-08-14 | Teknologian Tutkimuskeskus Vtt Oy | Arrangement and method for detection of freezing |
| CN103673960B (en) * | 2012-08-30 | 2016-12-21 | 国际商业机器公司 | For the method and apparatus predicting the ice coating state on transmission line of electricity |
| US20160169761A1 (en) * | 2014-12-10 | 2016-06-16 | Uchicago Argonne, Llc | Method and system for icing condition detection |
| WO2016141477A1 (en) * | 2015-03-12 | 2016-09-15 | Universite Laval | System and method for determining an icing condition status of an environment |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102721373A (en) * | 2012-06-26 | 2012-10-10 | 西安金源电气股份有限公司 | Online electrified railway overhead contact line icing monitoring system |
| CN109143407A (en) * | 2018-07-30 | 2019-01-04 | 华云升达(北京)气象科技有限责任公司 | The data of automatic weather station unify collection system and its method |
| KR102136131B1 (en) * | 2020-02-04 | 2020-07-22 | 김용섭 | Automatic road ice prediction system and operation method of the Same |
| CN113836730A (en) * | 2021-09-28 | 2021-12-24 | 国网重庆市电力公司电力科学研究院 | Method for calculating diameter of rotating multi-circle conductor for icing monitoring |
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