CN115642552A - Direct-current online anti-ice melting system of urban rail transit overhead line system - Google Patents
Direct-current online anti-ice melting system of urban rail transit overhead line system Download PDFInfo
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- CN115642552A CN115642552A CN202211233845.6A CN202211233845A CN115642552A CN 115642552 A CN115642552 A CN 115642552A CN 202211233845 A CN202211233845 A CN 202211233845A CN 115642552 A CN115642552 A CN 115642552A
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- 230000008018 melting Effects 0.000 title claims abstract description 26
- 238000012544 monitoring process Methods 0.000 claims abstract description 39
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- 238000004891 communication Methods 0.000 claims abstract description 10
- 239000013307 optical fiber Substances 0.000 claims description 3
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Abstract
The invention discloses a direct-current online anti-ice melting system of an urban rail transit overhead line system. The ice melting mode commonly used by the overhead contact system cannot be considered continuously, effectively, economically and easily implemented. In the monitoring system, the front-end monitoring equipment monitors the icing condition of a contact network 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 used for providing an auxiliary decision function for switching of the ice melting prevention system; the online ice-melting preventing system consists of a rectifier unit and a medium-voltage feedback device of different tractors, and a current loop is formed between a medium-voltage ring network and a contact network by utilizing different working combination modes between the rectifier unit and the medium-voltage feedback device and between the medium-voltage feedback devices, so that the ice melting prevention of the contact network is realized. According to the invention, the ice-melting prevention current circularly flows between the medium-voltage ring network and the contact network through different combination modes among the rectifier unit, the medium-voltage feedback device and the medium-voltage feedback device, so that the ice-melting prevention 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 for an urban rail transit overhead contact system.
Background
The railway is one of the major arteries for economic development, safe, stable, rapid and efficient operation of the railway is not achieved, and development of social economy and demands of people can be greatly influenced. The contact net is used as key equipment for power supply of the electric locomotive and is an important component of the urban rail transit traction power supply system. Due to the characteristics of line and open erection without reserve, the working performance of the contact network is easily influenced by external conditions, particularly under the weather conditions of low temperature, rain, snow and the like in winter, the contact network between an overhead section and a field section easily causes the problem of large-area ice coating, so that a locomotive cannot normally receive current, even a lead is galloped and broken, and the safe operation of urban rail transit is seriously influenced.
Aiming at the problem of icing of a contact net, the conventional deicing technology mainly comprises mechanical ice breaking, chemical agents, thermal deicing and the like, but the deicing mode cannot well give consideration to continuity, effectiveness, economy and easiness in implementation and has influence on the performance of the contact net.
Disclosure of Invention
In order to make up for the defects of the prior art, the invention provides the direct-current online anti-ice melting system for the urban rail transit overhead line system, and the rectifier units and the medium-voltage feedback devices of different traction stations are switched by combining the ice coating condition and position of the overhead line system, so that a current loop is formed between a medium-voltage ring network and the overhead line system, and online anti-ice melting of the overhead line system is realized.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a direct-current online ice-melting prevention system for an urban rail transit overhead contact system comprises an online monitoring system and an online ice-melting prevention system;
the online 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 the surrounding environment data and the icing condition of the contact network, and the data collected by the front-end monitoring equipment is transmitted to the monitoring host computer through the communication network; the monitoring host analyzes and calculates the required ice melting current, the wire temperature and the ice melting time, and provides an auxiliary decision function for the switching of the rail transit direct current online ice melting prevention system by using the background server;
the online ice-melting prevention system consists of a rectifier unit and a medium-voltage feedback device of different tractors, and a current loop is formed between a medium-voltage ring network and an overhead line system by utilizing different working combination modes between the rectifier unit and the medium-voltage feedback device and between the medium-voltage feedback devices, so that online ice-melting prevention of the overhead line system 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 ambient temperature, humidity, wind speed and wind direction data of the contact network, and the high-definition camera is used for monitoring the icing state of the contact network wires;
specifically, the working combination mode of the online anti-ice melting system comprises energy circulation between a rectifier set of two traction stations and a medium-voltage feedback device, energy circulation between the medium-voltage feedback devices of the two traction stations, energy circulation on two sides of three traction stations and energy circulation on one side of the 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) The system monitors meteorological data and an icing state of a contact network wire operating environment in real time, realizes the functions of on-line automatic monitoring and early warning of contact network icing, and provides an auxiliary decision function of an ice melting switching plan for an operation maintenance unit;
2) According to the direct-current online anti-icing system, the characteristics of bidirectional energy flow and controllable output characteristic of the medium-voltage feedback device are utilized, and the anti-icing current circularly flows between the medium-voltage ring network and the contact network by drawing different working combination modes among the rectifier unit, the medium-voltage feedback device and the medium-voltage feedback device, so that online anti-icing of the contact network is realized;
3) The invention not only improves the utilization rate of the medium-voltage feedback device, but also does not need additional equipment, and has the advantages of flexible control and high reliability.
Drawings
FIG. 1 is a schematic diagram of an energy circulation loop between two traction rectifier 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 stations of the present invention;
FIG. 3 is a schematic diagram of a three-tow station double sided energy cycle circuit of the present invention;
FIG. 4 is a schematic diagram of a three-traction single side energy cycle of the present invention;
FIG. 5 is a schematic view of an on-line monitoring system of the present invention.
Detailed Description
The present invention will be described in detail with reference to specific embodiments.
The invention provides a direct-current online anti-ice melting system of an urban rail transit overhead line system by utilizing a large-current thermal ice melting mode and combining the structure and the composition of the urban rail transit power supply system; the system comprises an online monitoring system and an online anti-ice melting system;
as shown in fig. 5, the online monitoring system for ice coating of the contact network realizes online automatic monitoring and early warning functions for ice coating of the contact network, and 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 equipment is used for monitoring ambient environment data and icing conditions of the contact network, and comprises a meteorological sensor and a high-definition camera, wherein the meteorological sensor is used for acquiring ambient temperature, humidity, wind speed and wind direction data of the contact network, and the high-definition camera is used for monitoring the icing state of a contact network wire; the data collected by the front-end monitoring equipment is transmitted to the monitoring host computer through a communication network, wherein the communication network can select GPRS/3G, ethernet and optical fiber; the monitoring host machine analyzes and calculates the icing thickness by using a video intelligent analysis technology and expert analysis software to obtain the required ice melting current, the required wire temperature and the required ice melting time; finally, a background server is utilized to provide an auxiliary decision function for the switching of the online anti-ice-melting system;
the online ice-melting prevention system consists of a rectifier unit and a medium-voltage feedback device of different tractors, and a current loop is formed between a medium-voltage ring network and a contact network by utilizing different working combination modes among the rectifier unit, the medium-voltage feedback device and the medium-voltage feedback device, so that online ice-melting prevention of the contact network is realized.
According to the conditions of a field traction power supply facility and the actual icing condition, the working modes of the direct-current online ice-melting preventing system can be divided into 4 types, namely energy circulation between the rectifier set of the two traction stations and the medium-voltage feedback device, energy circulation between the medium-voltage feedback devices of the two traction stations, energy circulation on two sides of the three traction stations and energy circulation on one side of the three traction stations.
Fig. 1 shows an energy circulation manner between a rectification unit and a medium-voltage feedback device of two traction stations, wherein the rectification unit of the traction station 1 operates in a rectification mode to provide a direct-current power supply for a contact network, and the medium-voltage feedback device of the traction station 2 operates in an inversion mode to feed current back to a medium-voltage ring network to form a loop. Wherein, the ice-melting prevention section of the contact net is arranged between the traction station 1 and the traction station 2.
Fig. 2 shows an energy circulation manner between medium-voltage feedback devices of two traction stations, wherein the medium-voltage feedback device of the traction station 1 operates in a rectification mode to provide a direct-current power supply for a contact network, and the medium-voltage feedback device of the traction station 2 operates in an inversion mode to feed current back to a medium-voltage ring network to form a loop. Wherein, the ice-melting prevention section of the contact net is arranged between the traction station 1 and the traction station 2.
Fig. 3 shows a bilateral energy circulation mode of a three-traction station, when an ice-melting region is prevented by a contact network, a large voltage drop can occur when ice-melting current passes through the contact network, and normal operation of a medium-voltage feedback device is affected. Therefore, an energy circulation scheme of two sides of the three traction stations is provided, the rectifier unit of the traction station 2 operates in a rectification mode to provide a direct-current power supply for a contact network, and the medium-voltage feedback devices of the traction station 1 and the traction station 3 operate in an inversion mode to feed current back to a medium-voltage ring network to form a loop. Wherein, the ice-melting prevention section of the contact net is arranged between the traction station 1 and the traction station 3.
Fig. 4 shows a unilateral energy cycle mode of three traction stations, under difficult conditions, the capacity of a medium-voltage feedback device in a traction station is limited, so that the requirement of the contact network for preventing (melting) ice current cannot be met, and the requirement of the contact network for meeting the ice current can be met by adopting the cooperative work of a plurality of traction stations. Taking the three traction stations as an example for analysis, the rectifier set of the traction station 1 operates in a rectification mode to provide a direct-current power supply for the overhead line system, and the medium-voltage feedback devices of the traction station 2 and the traction station 3 operate in an inversion mode to feed current back to a medium-voltage ring network to form a loop. Wherein, the ice-melting prevention section of the contact net is arranged between the traction station 1 and the traction station 3.
The method is characterized in that the method is combined with the icing condition and position analyzed and determined by an online monitoring system for icing of the contact network, a rail transit operation maintenance department is combined with a traction power supply system structure and composition, an optimal working combination mode is selected according to an anti-ice-melting scheme formulated in advance, and rectifier units and medium-voltage feedback devices of different traction stations are switched to form a current loop between a medium-voltage ring network and the contact network, so that online anti-ice-melting of the contact network is realized.
The invention is not limited to the examples, and any equivalent changes to the technical solution of the invention by a person skilled in the art after reading the description of the invention are covered by the claims of the invention.
Claims (4)
1. The utility model provides an ice-melt system is prevented on line to urban rail transit contact net direct current which characterized in that: comprises an online monitoring system and an online ice-melting prevention system;
the online 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 the surrounding environment data and the icing condition of the contact network, and the data collected by the front-end monitoring equipment is transmitted to the monitoring host computer through the communication network; the monitoring host analyzes and calculates the required ice melting current, the wire temperature and the ice melting time, and provides an auxiliary decision function for the switching of the rail transit direct current online ice melting prevention system by using the background server;
the online ice-melting prevention system consists of a rectifier unit and a medium-voltage feedback device of different tractors, and a current loop is formed between a medium-voltage ring network and a contact network by utilizing different working combination modes between the rectifier unit and the medium-voltage feedback device and between the medium-voltage feedback devices, so that online ice-melting prevention of the contact network is realized.
2. The urban rail transit overhead line system direct current online anti-icing system according to claim 1, characterized in that: the front end monitoring device comprises a meteorological sensor and a high-definition camera, the meteorological sensor is used for collecting ambient temperature, humidity, wind speed and wind direction data of the contact net, and the high-definition camera is used for monitoring the icing state of the contact net wires.
3. The urban rail transit overhead line system direct-current online ice melting prevention system according to claim 2, characterized in that: the working combination mode of the online ice-melting prevention system comprises energy circulation between the two traction station rectifier units and the medium-voltage feedback device, energy circulation between the two traction station medium-voltage feedback devices, energy circulation on two sides of the three traction stations and energy circulation on one side of the three traction stations.
4. The urban rail transit overhead line system direct current online anti-icing system according to claim 3, characterized in that: the communication network can be selected from GPRS/3G, ethernet and 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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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 (5)
| 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 |
| US20190070964A1 (en) * | 2016-03-03 | 2019-03-07 | Nr Electric Co., Ltd | 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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