CN115642552B - Urban rail transit contact net direct current online anti-ice-melting system - Google Patents
Urban rail transit contact net direct current online anti-ice-melting system Download PDFInfo
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- CN115642552B CN115642552B CN202211233845.6A CN202211233845A CN115642552B CN 115642552 B CN115642552 B CN 115642552B CN 202211233845 A CN202211233845 A CN 202211233845A CN 115642552 B CN115642552 B CN 115642552B
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- 238000002844 melting Methods 0.000 title claims abstract description 50
- 238000012544 monitoring process Methods 0.000 claims abstract description 39
- 230000008018 melting Effects 0.000 claims abstract description 31
- 230000002265 prevention Effects 0.000 claims abstract description 16
- 238000004891 communication Methods 0.000 claims abstract description 10
- 230000002146 bilateral effect Effects 0.000 claims description 6
- 239000011248 coating agent Substances 0.000 claims description 6
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- 239000013307 optical fiber Substances 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 2
- 230000003137 locomotive effect Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 210000001367 artery Anatomy 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000002457 bidirectional effect Effects 0.000 description 1
- 239000013043 chemical agent Substances 0.000 description 1
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- 238000012806 monitoring device Methods 0.000 description 1
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Abstract
The invention discloses a direct-current online anti-ice melting system of an urban rail transit contact network. The common ice melting mode of the overhead line system cannot be continuously effective and is economical and easy to implement. In the monitoring system, front-end monitoring equipment monitors the icing condition of the overhead line system and transmits the icing condition to a monitoring host through a communication network; the monitoring host calculates ice melting current, wire temperature and ice melting time, and a background server is utilized to provide an auxiliary decision function for switching of the ice melting prevention system; the online anti-ice-melting system consists of rectifier units and medium-voltage feedback devices of different traction stations, and a current loop is formed between the medium-voltage ring network and the contact network by utilizing different working combination modes between the rectifier units and the medium-voltage feedback devices and between the medium-voltage feedback devices, so that the anti-ice-melting of the contact network is realized. According to the invention, through different combination modes among the rectifier unit, the medium-voltage feedback device and the medium-voltage feedback device, the anti-ice-melting current circularly flows between the medium-voltage ring network and the contact network, and the anti-ice-melting of the contact network is realized.
Description
Technical Field
The invention belongs to the technical field of railway traction power supply and distribution, and particularly relates to a direct-current online anti-ice-melting system of an urban rail transit contact network.
Background
The railway is one of the large arteries for economic development, and the safe, stable, rapid and efficient operation of the railway is not realized, so that the development of social economy and the requirements of civilians are greatly influenced. The contact net is used as key equipment for power supply of an electric locomotive, and is an important component of an urban rail transit traction power supply system. Because the overhead contact system is erected along the line and in the open air and has no standby characteristic, the working performance of the overhead contact system is easily influenced by external conditions, especially under the weather conditions of low temperature, rain, snow and the like in winter, the overhead contact system in the field section easily causes the problem of large-area icing, so that a locomotive cannot normally receive current, even leads to galloping and fracture, and the safe operation of urban rail transit is seriously influenced.
Aiming at the problem of ice coating of the overhead line system, the conventional deicing technology mainly comprises mechanical ice breaking, chemical agents, thermal deicing and the like, but the ice melting mode cannot be well and continuously effective, is economical and easy to implement, and has influence on the performance of the overhead line system.
Disclosure of Invention
In order to make up the defects of the prior art, the invention provides the direct current online anti-ice melting system of the urban rail transit overhead contact system, which is used for switching the rectifier units and the medium-voltage feedback devices of different traction stations by combining the ice covering condition and the position of the overhead contact system, so that a current loop is formed between the medium-voltage looped network and the overhead contact system, and the online anti-ice melting of the overhead contact system is realized.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
A DC online anti-ice-melting system of an urban rail transit contact net comprises an online monitoring system and an online anti-ice-melting system;
The on-line monitoring system comprises front-end monitoring equipment, a communication network, a monitoring host and a background server; the front-end monitoring equipment is used for monitoring surrounding environment data of the overhead line system and ice coating conditions, and data acquired by the front-end monitoring equipment are transmitted to the monitoring host through the communication network; the monitoring host computer analyzes and calculates to obtain the needed ice melting current, wire temperature and ice melting time, and a background server is utilized to provide an auxiliary decision function for switching the direct-current online ice melting prevention system of the rail transit;
The online anti-ice-melting system consists of rectifier units and medium-voltage feedback devices of different traction stations, and a current loop is formed between the medium-voltage ring network and the catenary by utilizing different working combination modes between the rectifier units and the medium-voltage feedback devices and between the medium-voltage feedback devices, so that online anti-ice-melting of the catenary is realized;
Specifically, the front-end monitoring equipment comprises a meteorological sensor and a high-definition camera, wherein the meteorological sensor is used for collecting temperature, humidity, wind speed and wind direction data of the surrounding environment of the overhead contact system, and the high-definition camera is used for monitoring the icing state of a wire of the overhead contact system;
specifically, the working combination mode of the online ice melting prevention system comprises energy circulation between two traction rectifying units and a medium-voltage feedback device, energy circulation between two traction medium-voltage feedback devices, bilateral energy circulation of three traction stations and unilateral energy circulation of three traction stations;
specifically, the communication network can be selected from GPRS/3G, ethernet and optical fiber network.
The invention has the beneficial effects that:
1) According to the invention, the meteorological data and the icing state of the contact network wire running environment are monitored in real time, so that the online automatic monitoring and early warning function of the contact network icing is realized, and the auxiliary decision function of the ice melting switching plan is provided for an operation maintenance unit;
2) According to the direct current online anti-ice-melting system, the characteristics of bidirectional energy flow and controllable output characteristics of the medium voltage feedback device are utilized, and the anti-ice-melting current circularly flows between the medium voltage ring network and the contact network through different working combination modes among the traction rectifying unit, the medium voltage feedback device and the medium voltage feedback device, so that online anti-ice of the contact network is realized;
3) The invention not only improves the utilization rate of the medium voltage feedback device, but also has the advantages of flexible control and high reliability without additional equipment.
Drawings
FIG. 1 is a schematic diagram of an energy circulation loop between two traction rectifying units and a medium voltage feedback device according to the present invention;
FIG. 2 is a schematic diagram of an energy circulation loop between two traction medium voltage feedback devices according to the present invention;
FIG. 3 is a schematic diagram of a three traction bilateral energy circulation loop of the present invention;
FIG. 4 is a schematic diagram of a three traction unilateral energy cycle loop of the present invention;
FIG. 5 is a schematic diagram of an on-line monitoring system of the present invention.
Detailed Description
The present invention will be described in detail with reference to the following embodiments.
The invention provides a direct-current online anti-ice melting system of an urban rail transit overhead line system by utilizing a high-current thermal ice melting mode and combining the structure and the composition of an urban rail transit power supply system; the system comprises an online monitoring system and an online ice melting prevention system;
As shown in fig. 5, the online monitoring system for ice coating of the overhead contact system realizes an online automatic monitoring and early warning function for ice coating of the overhead contact system, provides an auxiliary decision function for switching of the direct current online ice melting prevention system, and comprises front-end monitoring equipment, a communication network, a monitoring host and a background server;
The front-end monitoring device is used for monitoring surrounding environment data and icing conditions of the overhead line system and comprises a meteorological sensor and a high-definition camera, wherein the meteorological sensor is used for collecting surrounding environment temperature, humidity, wind speed and wind direction data of the overhead line system, and the high-definition camera is used for monitoring the icing conditions of wires of the overhead line system; the data collected by the front-end monitoring equipment is transmitted to the monitoring host through a communication network, wherein the communication network can be GPRS/3G, ethernet or optical fiber; the monitoring host computer uses a video intelligent analysis technology and expert analysis software to analyze and calculate the ice coating thickness to obtain the required ice melting current, wire temperature and ice melting time; finally, a background server is utilized to provide an auxiliary decision function for switching of the online ice melting prevention system;
The online anti-ice-melting system consists of rectifier units and medium-voltage feedback devices of different traction stations, and a current loop is formed between the medium-voltage ring network and the contact network by utilizing different working combination modes among the rectifier units, the medium-voltage feedback devices and the medium-voltage feedback devices, so that online anti-ice-melting of the contact network is realized.
According to the on-site traction power supply facility conditions and the actual icing condition, the working modes of the direct current online anti-icing system can be divided into 4 types, namely energy circulation between two traction rectifying units and a medium-voltage feedback device, energy circulation between two traction medium-voltage feedback devices, bilateral energy circulation between three traction stations and unilateral energy circulation between three traction stations.
Fig. 1 is an energy circulation mode between two traction station rectifier units and a medium voltage feedback device, wherein the traction station rectifier unit 1 operates in a rectification mode to provide a direct current power supply for a catenary, and the traction station medium voltage feedback device 2 operates in an inversion mode to feed current back to a medium voltage looped network to form a loop. The contact net ice prevention section is arranged between the traction station 1 and the traction station 2.
Fig. 2 is an energy circulation mode between two traction station medium voltage feedback devices, wherein the traction station 1 medium voltage feedback device operates in a rectifying mode to provide a direct current power supply for the catenary, and the traction station 2 medium voltage feedback device operates in an inverting mode to feed current back to the medium voltage looped network to form a loop. The contact net ice prevention section is arranged between the traction station 1 and the traction station 2.
Fig. 3 is a bilateral energy circulation mode of the three traction stations, and when the contact net ice preventing (melting) area is long, a large voltage drop occurs when the ice preventing (melting) current passes through the contact net, and normal operation of the medium voltage feedback device is affected. Therefore, a bilateral energy circulation scheme of the three traction stations is provided, the traction station 2 rectifier unit operates in a rectification mode to provide a direct current power supply for the overhead contact system, and the traction station 1 and the traction station 3 medium-voltage feedback devices operate in an inversion mode to feed current back to the medium-voltage looped network to form a loop. The contact net ice prevention section is arranged between the traction station 1 and the traction station 3.
Fig. 4 is a single-side energy circulation mode of a three-traction station, under difficult conditions, the medium-voltage feedback device in the traction station is limited by capacity and cannot meet the requirement of the catenary on ice-preventing (melting) current, and a plurality of traction stations can be adopted to cooperatively work to meet the requirement of the catenary current on ice-preventing current. In the analysis of the three traction stations, the traction station 1 rectifier unit operates in a rectification mode to provide a direct current power supply for the contact net, and the traction station 2 and the traction station 3 medium voltage feedback devices operate in an inversion mode to feed back current to the medium voltage ring net to form a loop. The contact net ice prevention section is arranged between the traction station 1 and the traction station 3.
And the rail transit operation maintenance department combines the structure and the composition of the traction power supply system in combination with the ice covering condition and the position which are determined by the analysis of the online monitoring system of the overhead contact system, selects the optimal working combination mode according to the pre-formulated ice melting prevention scheme, and switches the rectifier units and the medium-voltage feedback devices of different traction stations so as to form a current loop between the medium-voltage ring network and the overhead contact system and realize online ice melting prevention of the overhead contact system.
The content of the invention is not limited to the examples listed, and any equivalent transformation to the technical solution of the invention that a person skilled in the art can take on by reading the description of the invention is covered by the claims of the invention.
Claims (4)
1. An urban rail transit contact net direct current online anti-icing system which is characterized in that: the system comprises an online monitoring system and an online ice melting prevention system;
The on-line monitoring system comprises front-end monitoring equipment, a communication network, a monitoring host and a background server; the front-end monitoring equipment is used for monitoring surrounding environment data of the overhead line system and ice coating conditions, and data acquired by the front-end monitoring equipment are transmitted to the monitoring host through the communication network; the monitoring host computer analyzes and calculates to obtain the needed ice melting current, wire temperature and ice melting time, and a background server is utilized to provide an auxiliary decision function for switching the direct-current online ice melting prevention system of the rail transit;
The online anti-ice-melting system consists of rectifier units and medium-voltage feedback devices of different traction stations, and a current loop is formed between the medium-voltage ring network and the catenary by utilizing different working combination modes between the rectifier units and the medium-voltage feedback devices and between the medium-voltage feedback devices, so that online anti-ice-melting of the catenary is realized.
2. The urban rail transit catenary direct current online anti-ice-melting system according to claim 1, wherein the system comprises the following components: the front-end monitoring equipment comprises a meteorological sensor and a high-definition camera, wherein the meteorological sensor is used for collecting temperature, humidity, wind speed and wind direction data of the surrounding environment of the overhead contact system, and the high-definition camera is used for monitoring the icing state of a wire of the overhead contact system.
3. The urban rail transit catenary direct current online anti-ice-melting system according to claim 2, wherein the system is characterized in that: the working combination mode of the online ice melting prevention system comprises energy circulation between the two traction rectifying units and the medium-voltage feedback device, energy circulation between the two traction medium-voltage feedback devices, bilateral energy circulation of the three traction sites and unilateral energy circulation of the three traction sites.
4. A direct current online ice melting prevention system for an urban rail transit catenary according to claim 3, wherein: the communication network can be GPRS/3G, ethernet or optical fiber network.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211233845.6A CN115642552B (en) | 2022-10-10 | 2022-10-10 | Urban rail transit contact net direct current online anti-ice-melting system |
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| CN202211233845.6A CN115642552B (en) | 2022-10-10 | 2022-10-10 | Urban rail transit contact net direct current online anti-ice-melting system |
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| CN115642552B true CN115642552B (en) | 2024-04-30 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105730248A (en) * | 2016-03-03 | 2016-07-06 | 南京南瑞继保电气有限公司 | Locomotive regenerative electric energy feedback system with ice melting function and control method |
| CN205632170U (en) * | 2016-05-13 | 2016-10-12 | 国网天津市电力公司 | Low pressure contravariant repayment formula traction power supply system who contains energy storage |
| CN207518265U (en) * | 2017-10-30 | 2018-06-19 | 镇江大全赛雪龙牵引电气有限公司 | Urban track traffic thyristor-type traction rectifier and feedback converter system |
| CN112260198A (en) * | 2020-09-28 | 2021-01-22 | 北京交通大学 | Multifunctional rail transit direct-current online ice melting system and method |
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- 2022-10-10 CN CN202211233845.6A patent/CN115642552B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105730248A (en) * | 2016-03-03 | 2016-07-06 | 南京南瑞继保电气有限公司 | Locomotive regenerative electric energy feedback system with ice melting function and control method |
| CN205632170U (en) * | 2016-05-13 | 2016-10-12 | 国网天津市电力公司 | Low pressure contravariant repayment formula traction power supply system who contains energy storage |
| CN207518265U (en) * | 2017-10-30 | 2018-06-19 | 镇江大全赛雪龙牵引电气有限公司 | Urban track traffic thyristor-type traction rectifier and feedback converter system |
| CN112260198A (en) * | 2020-09-28 | 2021-01-22 | 北京交通大学 | Multifunctional rail transit direct-current online ice melting system and method |
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| CN115642552A (en) | 2023-01-24 |
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