CN115800169B - Non-split-phase-area sectionally adjustable direct-current ice melting system applicable to overhead contact line and carrier cable ice coating - Google Patents
Non-split-phase-area sectionally adjustable direct-current ice melting system applicable to overhead contact line and carrier cable ice coating Download PDFInfo
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- CN115800169B CN115800169B CN202211683098.6A CN202211683098A CN115800169B CN 115800169 B CN115800169 B CN 115800169B CN 202211683098 A CN202211683098 A CN 202211683098A CN 115800169 B CN115800169 B CN 115800169B
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Abstract
The invention discloses a non-split-phase-area sectionally-adjustable direct-current ice melting system suitable for overhead lines and carrier ropes to cover ice, which is used for sectionally melting ice through different non-split-phase areas on two sides of a split-phase area, and adopts different ice melting currents for different types of ice cover by combining natural environment detection and environmental condition feedback control, so that the generalization capability of an ice melting technology is enhanced, the ageing of overhead lines and carrier ropes and the electric consumption cost of ice melting are reduced, and the safety and reliability of railway transportation are improved.
Description
Technical neighborhood
The invention belongs to the technical field of electrified rail transit, and particularly relates to a non-split-phase-area sectionally adjustable direct-current ice melting system suitable for overhead contact systems and catenary ice coating.
Background
In recent years, along with the rapid development of electrified railways in China, a large number of high-speed railways are put into operation, and the advantages of safety, high efficiency, convenience, environmental protection and the like are achieved, so that the economic development of the whole country is greatly promoted. However, some new electrified railways can cross some areas with low temperature, high humidity and high altitude and wind speed, when the areas are in the empty window period of a transportation line, as no current flows through a contact net and a pantograph of a train in running slides over, different types of ice coating are easy to generate under different natural conditions, and a carrier cable and the ice coating on the contact net can cause the line to be collapsed by the ice coating with excessive quality if not cleaned timely, and can cause the whole transportation network to be paralyzed when serious. The ice coating on the contact net can also have adverse effect on the electric power taking action of the pantograph when the train passes through, and the misoperation of train protection can be caused due to poor contact between the pantograph and the contact net when the electric power taking action is serious, so that the transportation capacity of the whole line is finally affected.
According to the mechanism and the formation process of ice coating, the growth process of ice coating can be divided into dry growth and wet growth, and the damage to a power transmission line is larger due to the larger density of ice coating due to the wet growth. At present, the ice coating mechanism of the power transmission line and the insulator is mainly studied internationally from the aspects of meteorology, hydrodynamics and thermodynamics, and the core of the ice coating mechanism is a power transmission line airflow field process, a water drop capturing process and a heat balance process, wherein the water drop track and the collision rate of water drops and wires are determined by the airflow field process, the water drop capturing process determines the quantity of water drops which participate in the conversion of water and ice, and the heat balance process determines the conversion rate of water and ice, so that the ice coating mechanism is not only a base of ice coating, but also a base of ice melting.
Thermodynamic deicing is a method for preventing and melting ice coating by applying high current to a power transmission line to generate heat. For the local power industry, thermodynamic deicing is the most effective deicing scheme with better application effect due to the characteristics of long line, simple structure, single environment and the like. The method can realize remote, automatic and controllable online deicing and greatly improve deicing efficiency. The thermodynamic deicing method mainly comprises three modes of direct current short circuit deicing and high-frequency excitation deicing and alternating current short circuit deicing. The high-frequency excitation deicing method is to apply a high-frequency alternating current power supply on a transmission line to generate a wave blocking, and the deicing effect is achieved by utilizing the principle of high skin effect and dielectric loss of the line. The method is relatively complex, equipment investment cost is relatively high, and related researches are less. The alternating current short circuit deicing is a method for taking a power transmission line as a load, forming larger short circuit current by shorting different phase sequence lines, and heating the power transmission line so as to achieve the deicing effect. The power supply has the advantages of no need of accessing a new power supply and reduction of equipment investment, but has the disadvantage that the alternating current is easy to cause unnecessary transmission loss if the conditions such as inductance and the like are considered. The DC short circuit deicing method is a method for converting an AC power supply provided by a bus of a substation into DC power through a rectifying device, and heating an icing circuit serving as a load to achieve a deicing effect.
In the current direct current ice melting technology, most of the ice melting technologies have poor generalization capability and are difficult to implement in changeable and complex natural environments in China; meanwhile, the existing direct-current deicing technology is used for integrally deicing in a large range without dividing into small sections, but the deicing method can aggravate the aging degree of a contact net and a carrier cable, increase the cost for equipment maintenance, and in addition, the same deicing current is adopted for different types of icing, so that the electric energy resource is wasted greatly.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a non-split-phase-area sectionally adjustable direct-current ice melting system suitable for overhead contact systems and carrier ropes to cover ice so as to strengthen the generalization capability of the ice melting technology, reduce the ageing of the overhead contact systems and the carrier ropes and the power consumption cost of ice melting, and improve the safety and reliability of railway transportation.
In order to achieve the above object, the invention is applicable to a non-split-phase-area sectionally adjustable direct-current ice melting system for overhead contact lines and messenger wire ice coating, which is characterized by comprising the following components:
the two environment monitoring modules are respectively arranged at two sides of the phase separation area and are used for detecting real-time environment wind speed, temperature and humidity on different non-phase separation area sections at two sides of the phase separation area, wherein one side of the non-phase separation area is called as a section 1, and the other side of the non-phase separation area is called as a section 2;
the system comprises a section 1 control center and a section 2 control center, wherein an environment monitoring module for monitoring the real-time environment wind speed, temperature and humidity of the section 1 transmits the current environment wind speed, temperature and humidity to the section 1 control center, and an environment monitoring module for monitoring the real-time environment wind speed, temperature and humidity of the section 2 transmits the current environment wind speed, temperature and humidity to the section 2 control center; the section 1 control center and the section 2 control center are all received by environmental signalsThe device and a section PLC (programmable logic controller ) control system, wherein the environmental signal receiver is used for receiving the environmental wind speed, the temperature and the humidity, and then sending the environmental signal receiver to the section PLC control system for judgment, and when the environmental temperature is lower than 0 ℃, the air humidity is higher than 85%, the wind speed is higher than 1m/s, the section PLC control system receives the air window period signal f at the same time 0 Then, the section PLC control system sends out a section ice melting enabling signal, and the section ice melting enabling signal sent out by the section 1 control center is recorded as f 1 The section ice-melting enabling signal sent by the section 2 control center is recorded as f 2 ；
A master PLC control system in the traction substation;
section 1 ice melting current on-off control module, section 1 main switch control circuit and section 1 ice melting current backflow switch circuit, and a main PLC control system in a traction substation is used for controlling the current on-off control module according to a section ice melting enabling signal f 1 The ice-melting current on-off control module of the control section 1 controls the main switch control circuit of the section 1 and the ice-melting current reflux switch circuit of the section 1 to be conducted;
after the section 1 main switch control circuit is conducted, alternating current output by the section 1 three-phase transformer is transmitted to the section 1 step-down transformer through the section 1 main switch control circuit to be step down, then rectified by the section 1 rectifying circuit, filtered by the section 1 filtering circuit and then inverted by the section 1 inverting circuit to become ice melting current within the bearing range of the section 1 contact net and the section 1 carrier cable;
the system comprises a section 1 ice melting current control module, a section 1 contact network current adjustable circuit and a section 1 carrier cable current adjustable circuit, wherein the section 1 environment monitoring module monitors the environment wind speed, the temperature and the humidity, and sends the section 1 control center, after the section PLC control system of the section 1 control center judges the ice coating type, the ice coating type is sent to a total PLC control system in a traction substation, the total PLC control system calculates the proper ice melting current at the moment according to the ice coating type through real-time environment data, sends the ice melting current to the section 1 ice melting current control module, sends an ice melting current analog control signal to a driving circuit after D/A conversion of a digital-to-analog circuit, amplifies the analog control signal to meet the value required by the section 1 contact network current adjustable circuit and the section 1 carrier cable current adjustable circuit, and adjusts the ice melting current of the contact network output by the section 1 inverter circuit according to the required value to obtain the section 1 ice melting current and the carrier cable ice melting current, and loads the ice melting current of the section 1 contact network and the carrier cable into the section 1 contact network and the section 1 carrier cable respectively;
carrier cable ice melting current reflux switch of section 1 and carrier cable bidirectional conduction control switch between section 1 and section 2, and the total PLC control system is used for controlling the switch according to section ice melting enabling signal f 1 The control section 1 ice melting current on-off control module controls the conduction of a carrier cable ice melting current reflux switch of the section 1, and simultaneously turns off a carrier cable bidirectional conduction control switch between the section 1 and the section 2, so that ice melting current loops of a step-down transformer-contact net-step-down transformer and a step-down transformer-carrier cable ice melting current reflux circuit-step-down transformer are formed in the section 1; the bidirectional conduction control switch of the carrier cable is used for providing a passage for current on the carrier cable in a non-empty window period;
the section 1 ice melting condition judging module is used for sending tension and angle change information of the overhead line and the overhead line to the section 1 ice melting condition judging module through the overhead line tension, the angle sensor, the overhead line tension and the angle sensor of the section 1 in the ice melting process, judging whether the section 1 is ice-melted at the moment after receiving and processing of a tension angle receiver and a PLC (programmable logic controller) control system, if so, sending a section 1 ice-melting end signal to a total PLC control system in a traction substation, and controlling a section 1 ice-melting current on-off control module to control a section 1 total switch control circuit, a section 1 ice-melting current backflow switch circuit and a section 1 overhead line ice-melting current backflow switch to be disconnected;
section 2 ice melting current on-off control module, section 2 main switch control circuit and section 2 ice melting current backflow switch circuit, and a main PLC control system in a traction substation is used for controlling the current backflow switch circuit according to a section ice melting enabling signalf 2 The control section 2 ice melting current on-off control module controls the section 2 main switch control circuit and the section 2 ice melting current reflux switch circuit to be conducted;
after the section 2 main switch control circuit is conducted, alternating current output by the section 2 three-phase transformer is transmitted to the section 2 step-down transformer through the section 2 main switch control circuit for step-down, then rectified by the section 2 rectifying circuit, filtered by the section 2 filtering circuit and inverted by the section 2 inverting circuit to become ice melting current within the bearing range of the section 2 contact net and the section 2 carrier cable;
the system comprises a section 2 ice melting current control module, a section 2 catenary current adjustable circuit and a section 2 catenary current adjustable circuit, wherein the section 2 environment monitoring module monitors the environment wind speed, the temperature and the humidity, and sends the section 2 control center, a section PLC control system of the section 2 control center judges the ice coating type and then sends the ice coating type to a total PLC control system in a traction substation, the total PLC control system calculates the proper ice melting current at the moment according to the ice coating type through real-time environment data, sends the ice melting current to the section 2 ice melting current control module, sends an ice melting current analog control signal to a driving circuit after D/A conversion of a digital-to-analog circuit, amplifies the analog control signal to meet the value required by the section 2 catenary current adjustable circuit and the section 2 catenary current adjustable circuit, and adjusts the ice melting current output by a section 2 inverter circuit according to the required value to obtain the section 2 ice melting current and the catenary ice melting current, and loads the ice melting current onto the section 2 catenary and the section 2 catenary respectively.
Section 2 carrier cable ice melting current reflux switch, and the total PLC control system is used for controlling the signal f according to section ice melting 2 The control section 2 ice melting current on-off control module controls the conduction of the section 2 catenary ice melting current reflux switch, and simultaneously turns off the catenary bidirectional conduction control switch between the section 1 and the section 2, so that a step-down transformer-catenary-step-down transformer and a step-down transformer are formed in the section 2An ice melting current loop of the voltage transformer, the carrier rope ice melting current return circuit and the step-down transformer;
the section 2 ice melting condition judging module is used for sending tension and angle change information of the overhead line and the overhead line to the section 2 ice melting condition judging module through the overhead line tension, the angle sensor, the overhead line tension and the angle sensor of the section 2 in the ice melting process, judging whether the section ice melting is finished at the moment after receiving and processing of the tension angle receiver and the PLC control system, and sending a section 2 ice melting finishing signal to a total PLC control system in a traction substation if the section 2 ice melting is finished, wherein the total PLC control system controls a section 2 ice melting current on-off control module to control a section 2 total switch control circuit, a section 2 ice melting current backflow switch circuit and a section 2 overhead line ice melting current backflow switch to be disconnected;
after the total PLC control system receives the ice melting ending signal of the section 1 and the ice melting ending signal of the section 2, the carrier rope bidirectional conduction control switch is conducted to prepare for the end of the empty window period, and at the moment, the ice melting is ended and the normal state is recovered.
The invention aims at realizing the following steps:
the invention is suitable for the non-split-phase-area sectionally-adjustable direct-current ice melting system of the overhead line and the carrier cable ice, performs sectionally ice melting through different non-split-phase areas on two sides of the split-phase area, combines natural environment detection and environmental condition feedback control, adopts different ice melting currents for different types of ice coating, strengthens the generalization capability of the ice melting technology, reduces the aging of the overhead line and the carrier cable and the power consumption cost of the ice melting, and improves the safety and reliability of railway transportation.
The invention has the following beneficial effects:
1. according to the invention, when a high-speed railway passes through a region with low temperature, large humidity change and high altitude and high wind speed and is in a window period of a transportation line, as no current flows on a contact net and a pantograph slides, different types of ice coating are easy to generate under special natural conditions, and the phenomenon that the line is collapsed by excessive quality of ice coating can be caused by excessive load bearing ropes and the ice coating on the contact net, and paralysis of the whole transportation network can be caused in severe cases. The conventional ice melting technology is often used for carrying out integral ice melting in a large range without dividing into small sections, but the ice melting method can aggravate the aging degree of the overhead line and the carrier cable and increase the cost of equipment maintenance. According to the invention, the ice melting loops of different sections are selected and conducted according to the environmental conditions of the different sections, so that the pertinence and the flexibility of ice melting are improved, meanwhile, the excessive electric energy loss caused by indiscriminate long-distance ice melting is reduced, the energy is saved, meanwhile, the negative influence of long-term heating ice melting of resistances of the overhead contact line and the carrier cable on the service life of the overhead contact line is reduced, the service life of the overhead contact line can be prolonged by reducing the ice melting current flowing of the non-ice-covered section, and the cost for equipment maintenance is reduced.
2. The non-split-phase-division direct-current ice melting technology adopts a mode which can be suitable for ice coating currents of different ice coating types. The ice-melting current of the same type is adopted, so that the electric energy waste is caused, and unnecessary loss is caused to the contact network and the carrier cable, so that the proper ice-melting current of the section is calculated according to different ice-melting types, the electric energy waste is reduced, and the generalization capability of the ice-melting system is enhanced, and the ice-melting system can cope with more natural environments.
Drawings
FIG. 1 is a schematic diagram of a railway traction power supply partial structure;
FIG. 2 is a schematic view of a catenary, and catenary ice-on cross-section;
FIG. 3 is a schematic circuit diagram of an embodiment of the non-split phase section adjustable DC ice melting system of the present invention suitable for catenary and catenary ice coating;
FIG. 4 is a schematic diagram of the control process of the non-split phase section sectionally adjustable DC ice melting system shown in FIG. 3 and suitable for catenary and catenary icing;
fig. 5 is a flow chart of the ice melting system of fig. 3 for a non-split phase section segment-adjustable direct current ice melting system suitable for catenary and catenary ice coating.
The explanation of the drawings: 1-vertical rod 2-cantilever support 3-insulating device 4-carrier cable 5-hanger 6-pantograph 7-contact net 8-phase separation section 9-A phase electricity 10-B phase electricity 11-icing 12-icing lower cross section 13-conducting wire 14-section 1 three-phase transformer 15-section 1 total switch control circuit 16-section 1 transformer 17-section 1 rectifying circuit 18-section 1 filter circuit 19-section 1 inverter circuit 20-section 1 contact net current adjustable circuit 21-section 1 carrier cable current adjustable circuit, 22-section 1 ice melting current reflux switch circuit, 23-section 1 environment detection module 24-total PLC control system 25-section 1 carrier cable ice melting current reflux switch 26-section 2 carrier cable bidirectional conduction control switch 28-section 1 control center 29-section 1 ice melting current on-off control module 30-section 1 ice melting current control module 31-section 1 ice melting condition judgment module 32-carrier cable tension, angle sensor 34-carrier cable contact net ice melting current
Detailed Description
The following description of the embodiments of the invention is presented in conjunction with the accompanying drawings to provide a better understanding of the invention to those skilled in the art. It is to be expressly noted that in the description below, detailed descriptions of known functions and designs are omitted here as perhaps obscuring the present invention.
The running condition of the train running, namely the railway traction power supply partial structure is shown in figure 1, a plurality of vertical rods 1 on the train running line play a role in supporting the whole traction power supply system, a cantilever support 2 is connected with the vertical rods 1 and an insulating device 3, and the insulating device 3 plays a role in keeping the vertical rods 1 electrically insulated from the power supply line. The insulating device 3 is connected with a carrier rope 4, and the carrier rope 4 is an important lead which plays the dual roles of power transmission and suspension locomotive slideway lines, namely a contact net 7. The function of the dropper 5 is to suspend the catenary 7 to the carrier cable 4. The contact net 7 has the function of supplying the electric energy output by the traction substation to the train for running through friction and electricity taking of the pantograph 6 on the train.
The phenomenon of overhead line and carrier cable icing is easy to occur in areas with low temperature, high altitude, high wind speed and large humidity change, the schematic diagrams of the overhead line and carrier cable icing section are shown in fig. 2, at the moment, the cross section of the wire covered by the icing is a cross section diagram when the wire is not melted, at the moment, the icing 11 in the sub-icing cross section 12 is covered around the wire 13, and the icing 11 above the wire 13 is melted faster than the melting below along with the continuous melting of the icing, so that the situation that the carrier cable 4 is broken down to the overhead line 7 is easy to occur.
Fig. 3 is a schematic circuit diagram of a specific embodiment of the non-split-phase section adjustable direct current ice melting system applicable to overhead contact systems and catenary ice coating.
In this embodiment, as shown in fig. 3, the invention is applicable to a non-split-phase-area sectionally adjustable direct-current ice melting system of overhead lines and catenary ice coating, and two environment monitoring modules composed of wind speed measuring sensors, temperature sensors and humidity sensors are respectively arranged at two sides of a split-phase area and used for detecting real-time environment wind speeds, temperatures and humidity on different non-split-phase-area sections at two sides of the split-phase area, wherein one non-split-phase-area section is called section 1, and the other non-split-phase-area section is called section 2. In this embodiment, for brevity, the constituent modules of the section 1 are completely labeled, the constituent modules of the section 2 are identical to the constituent modules of the section 1, and part of the constituent modules of the section 2 are not labeled, and in fig. 3, the environmental detection module of the section 1 is labeled 23.
As shown in fig. 4, the environmental monitoring module 23 monitoring the real-time environmental wind speed, temperature and humidity of the section 1 transmits the current environmental wind speed, temperature and humidity to the section 1 control center 28, and the environmental monitoring module monitoring the real-time environmental wind speed, temperature and humidity of the section 2 transmits the current environmental wind speed, temperature and humidity to the section 2 control center. As shown in fig. 4, the section 1 control center 28 and the section 2 control center are both composed of an environmental signal receiver and a section PLC control system, wherein the environmental signal receiver is used for receiving the environmental wind speed, the temperature and the humidity, and then sending the environmental signal receiver to the section PLC control system to judge, when the environmental temperature is lower than 0 ℃, the air humidity exceeds 85%, the wind speed is greater than 1m/s, and the section PLC control system receives the air window period signal f 0 Then, the section PLC control system sends out a section ice melting enabling signal, and the section ice melting enabling signal sent out by the section 1 control center is recorded as f 1 The section ice-melting enabling signal sent by the section 2 control center is recorded as f 2 。
As shown in fig. 4, the overall PLC control system 24 within the traction substation is based on the zone ice melting enable signal f 1 The ice-melting current on-off control module 29 of the control section 1 controls the total switch control circuit 15 of the section 1 and the ice-melting current reflux switch circuit 22 of the section 1 to be conducted.
After the section 1 main switch control circuit 15 is conducted, alternating current output by the section 1 three-phase transformer 14 is transmitted to the section 1 step-down transformer 16 through the section 1 main switch control circuit 15 for step-down, then rectified by the section 1 rectifying circuit 17, filtered by the section 1 filtering circuit 18, and inverted by the section 1 inverter circuit 19 to become ice melting current within the bearing range of the section 1 contact net 7 and the section 1 carrier cable 4.
The total PLC control system 24 generates a section ice melting enable signal f 1 The control section 1 ice melting current on-off control module 29 controls the conduction of the section 1 carrier cable ice melting current reflux switch 25, and the function of the section 1 carrier cable ice melting current reflux switch 25 is to convey the carrier cable ice melting current (38) of the section 1 back to the secondary side of the step-down transformer, so that an ice melting short circuit loop is formed. Simultaneously, a carrier rope bidirectional conduction control switch 27 between the section 1 and the section 2 is turned off, so that an ice melting current loop of a step-down transformer-contact net-step-down transformer and a step-down transformer-carrier rope ice melting current return circuit-step-down transformer is formed in the section 1; wherein the carrier cable bi-directional conduction control switch 27 functions to provide a path for current on the carrier cable during the non-empty window period.
The section 1 environment monitoring module monitors the environment wind speed, the temperature and the humidity, the section 1 control center 28 is sent, after the section PLC control system of the section 1 control center 28 judges the icing type, the icing type is sent to the total PLC control system 24 in the traction substation, the total PLC control system 24 calculates the appropriate ice melting current at the moment according to the icing type through real-time data, the appropriate ice melting current is sent to the section 1 ice melting current control module 30, the D/A conversion is carried out through the DAC0832 digital-analog conversion circuit, the ice melting current analog control signal is sent to the driving circuit, the analog control signal is amplified to meet the value required by the section 1 catenary current adjustable circuit 20 and the section 1 catenary current adjustable circuit 21, the ice melting current output by the section 1 inverter circuit is regulated according to the required value, and the section 1 catenary ice melting current and the catenary load on the section 1 catenary ice melting current and the section 1 catenary load on the section 1 catenary load cable respectively, and the size of the section 1 catenary ice melting current I1 and the catenary ice melting current I2 are controlled. In the embodiment, the control system judges the ice coating type, and when the temperature is-16 to-10 ℃, the wind speed is 1-3 m/s and the humidity is low, the Hou Rongyi ice is produced, and when the temperature is-8 to-3 ℃ and the wind speed is 2-8 m/s, the humidity is moderate, and the mixing rime is easy to produce. Specific judgment standards need to be determined according to the region where the specific section is located. Rime is easy to occur in areas with low altitude, low temperature and high humidity; the higher the altitude, the easier and thicker the ice coating; ice is more easily covered when the water source is close to the water source; the windward slope is easy to be covered with ice; and the urban suburbs are easy to be covered with ice and the like. Parameters such as the heat conductivity coefficient lambda and the like are adjusted according to the icing type, so that the proper deicing current under the current condition is obtained.
In the embodiment, after the icing type is judged, the resistance R of the catenary and the carrier cable wires is determined according to the temperature of 0 DEG C 0 Deicing time t r The difference delta t between the conductor temperature and the outside air temperature, the relative density g of the ice coating 0 The diameter D of the wire, the thickness b of the ice layer, the outer diameter D of the conductor after ice coating and the equivalent ice layer conduction thermal resistance R T0 Calculating the g under the corresponding natural environment (such as rime 0 Taking 0.9, the coefficient of heat conduction lambda is 2.27X10-2 when in rime, and the magnitude of ice melting current is 0.12X10-2 when in rime. Specifically, the wire resistance R 0 Thermal conductivity lambda and equivalent ice layer conduction thermal resistance R T0 The larger the deicing current is, the smaller the deicing time t is r The difference delta t between the conductor temperature and the outside air temperature, the relative density g of the ice coating 0 The larger the wire diameter D, the ice layer thickness b and the outer diameter D of the conductor after ice coating, the larger the ice melting current.
In the process of ice melting, the tension and angle change information of the catenary and the catenary is sent to the ice melting condition judging module 31 of the section 1 through the catenary tension and angle sensor 32 and the catenary tension and angle sensor 33 of the section 1, whether the ice melting of the section 1 is finished at the moment is judged after the tension angle receiver and the receiving processing of the PLC control system are carried out, if the ice melting is finished, a section 1 ice melting finishing signal is sent to the total PLC control system in the traction substation, and the total PLC control system 24 controls the section 1 ice melting current on-off control module 29 to control the section 1 total switch control circuit 15, the section 1 ice melting current backflow switch circuit 22 and the section 1 catenary ice melting current backflow switch to be disconnected 25.
The ice melting control of the section 2 is the same as that of the section 1, and will not be described here.
After the total PLC control system 24 receives the ice melting end signal of the section 1 and the ice melting end signal of the section 2, the carrier rope bidirectional conduction control switch 27 is conducted to prepare for the end of the empty window period, and at the moment, the ice melting is ended and the normal state is recovered.
Fig. 5 is a flow chart of the ice melting system of fig. 3 for a non-split phase section segment-adjustable direct current ice melting system suitable for catenary and catenary ice coating.
In this embodiment, in the present invention, the ice melting process of the section 1 includes:
step S1: receiving a null window period signal f 0 ；
Step S2: the control center of the section 1 judges the icing threshold, and if the environmental temperature, the air temperature and the wind speed of the section 1 meet the icing threshold, a section ice melting enabling signal f is sent out 1 ；
Step S3: the total PLC control system in the traction substation judges whether a section ice melting enabling signal f is received or not 1 The method comprises the steps of carrying out a first treatment on the surface of the If the signal is received, the step S4 is entered;
step S4: the ice melting loop of the section 1 is conducted through the ice melting current on-off control module of the section 1;
step S5: judging the ice coating type according to the received environmental data;
step S6: calculating corresponding ice melting current according to the ice coating type;
step S7: combining the calculated ice melting current, outputting smaller current by the carrier cable current adjustable circuit Xiang Chengli cable, and outputting larger current to the contact network by the contact network current adjustable circuit;
step S8: is the determination of whether the tension and angle change values of the catenary and the catenary are greater than the set threshold value for the end of ice melting? If yes, go to step S9, if not, continue waiting until yes;
step S9: and after the ice melting is finished, the corresponding switch is disconnected, the carrier rope bidirectional conduction control switch is conducted, and the ice melting current is output in a system.
Because if the ice melting current of the carrier cable above the contact network is too large, the ice coating is possibly heated unevenly, so that the ice coating on the carrier cable falls on the contact network, the contact network is damaged in a receiving and unloading way, high equipment maintenance cost is generated, and the normal operation of the whole line is influenced when serious. Therefore, in this embodiment, according to the calculated ice melting current, the current output to the carrier cable is reduced appropriately, that is, the ice melting current on the carrier cable is reduced to make the ice covered on the carrier cable heated more uniformly, the phenomenon that the ice covered drops to the overhead line is avoided, the safety and stability of the ice melting system are improved, and at the same time, the current output to the overhead line is increased appropriately, that is, the ice melting current on the contact line is increased to melt the ice covered on the contact line as soon as possible, and the idle window period signal f is avoided 0 And (3) ending, the ice coating on the contact network is not completely melted, so that the safety risk of the train in the non-empty window period occurs when the train passes.
In the embodiment, whether the tension and angle change values on the contact net and the carrier rope in the ice melting process are larger than the ice melting ending threshold value or not is detected, if yes, the ice melting ending is judged, wherein the threshold value is set for preventing the misjudgment of a system caused by natural conditions such as wind blowing, rain falling and the like, so that the safety risk that the ice melting is not thorough and a train in a non-empty window period passes is reduced.
While the foregoing describes illustrative embodiments of the present invention to facilitate an understanding of the present invention by those skilled in the art, it should be understood that the present invention is not limited to the scope of the embodiments, but is to be construed as protected by the following claims insofar as various changes are within the spirit and scope of the present invention as defined and defined by the appended claims.
Claims (4)
1. The utility model provides a non-split phase district segmentation adjustable direct current ice-melt system suitable for contact net and carrier cable icing which characterized in that includes:
the two environment monitoring modules are respectively arranged at two sides of the phase separation area and are used for detecting real-time environment wind speed, temperature and humidity on different non-phase separation area sections at two sides of the phase separation area, wherein one side of the non-phase separation area is called as a section 1, and the other side of the non-phase separation area is called as a section 2;
the system comprises a section 1 control center and a section 2 control center, wherein an environment monitoring module for monitoring the real-time environment wind speed, temperature and humidity of the section 1 transmits the current environment wind speed, temperature and humidity to the section 1 control center, and an environment monitoring module for monitoring the real-time environment wind speed, temperature and humidity of the section 2 transmits the current environment wind speed, temperature and humidity to the section 2 control center; the section 1 control center and the section 2 control center are both composed of an environment signal receiver and a section PLC control system, wherein the environment signal receiver is used for receiving the environment wind speed, the temperature and the humidity, and then sending the environment signal receiver to the section PLC control system for judgment, when the environment temperature is lower than 0 ℃, the air humidity exceeds 85%, the wind speed is higher than 1m/s, and meanwhile, the section PLC control system receives the air window period signal f 0 Then, the section PLC control system sends out a section ice melting enabling signal, and the section ice melting enabling signal sent out by the section 1 control center is recorded as f 1 The section ice-melting enabling signal sent by the section 2 control center is recorded as f 2 ；
A master PLC control system in the traction substation;
section 1 ice melting current on-off control module, section 1 main switch control circuit and section 1 ice melting current backflow switch circuit, and a main PLC control system in a traction substation is used for controlling the current on-off control module according to a section ice melting enabling signal f 1 The ice-melting current on-off control module of the control section 1 controls the main switch control circuit of the section 1 and the ice-melting current reflux switch circuit of the section 1 to be conducted;
after the section 1 main switch control circuit is conducted, alternating current output by the section 1 three-phase transformer is transmitted to the section 1 step-down transformer through the section 1 main switch control circuit to be step down, then rectified by the section 1 rectifying circuit, filtered by the section 1 filtering circuit and then inverted by the section 1 inverting circuit to become ice melting current within the bearing range of the section 1 contact net and the section 1 carrier cable;
the system comprises a section 1 ice melting current control module, a section 1 contact network current adjustable circuit and a section 1 carrier cable current adjustable circuit, wherein the section 1 environment monitoring module monitors the environment wind speed, the temperature and the humidity, and sends the section 1 control center, after the section PLC control system of the section 1 control center judges the ice coating type, the ice coating type is sent to a total PLC control system in a traction substation, the total PLC control system calculates the proper ice melting current at the moment according to the ice coating type through real-time environment data, sends the ice melting current to the section 1 ice melting current control module, sends an ice melting current analog control signal to a driving circuit after D/A conversion of a digital-to-analog circuit, amplifies the analog control signal to meet the value required by the section 1 contact network current adjustable circuit and the section 1 carrier cable current adjustable circuit, and adjusts the ice melting current of the contact network output by the section 1 inverter circuit according to the required value to obtain the section 1 ice melting current and the carrier cable ice melting current, and loads the ice melting current of the section 1 contact network and the carrier cable into the section 1 contact network and the section 1 carrier cable respectively;
carrier cable ice melting current reflux switch of section 1 and carrier cable bidirectional conduction control switch between section 1 and section 2, and the total PLC control system is used for controlling the switch according to section ice melting enabling signal f 1 The control section 1 ice melting current on-off control module controls the conduction of a carrier cable ice melting current reflux switch of the section 1, and simultaneously turns off a carrier cable bidirectional conduction control switch between the section 1 and the section 2, so that ice melting current loops of a step-down transformer-contact net-step-down transformer and a step-down transformer-carrier cable ice melting current reflux circuit-step-down transformer are formed in the section 1; wherein the bidirectional conduction control switch of the carrier rope is used for providing a passage for current on the carrier rope in a non-empty window period；
The section 1 ice melting condition judging module is used for sending tension and angle change information of the overhead line and the carrier rope to the section 1 ice melting condition judging module through the carrier rope tension and angle sensor of the section 1 in the ice melting process, judging whether the section 1 is ice-melted at the moment after receiving processing of the tension angle receiver and the PLC control system, and sending a section 1 ice-melting ending signal to a total PLC control system in a traction substation if the section 1 is ice-melted, wherein the total PLC control system controls a section 1 ice-melting current on-off control module to control a section 1 total switch control circuit, a section 1 ice-melting current backflow switch circuit and a section 1 carrier rope ice-melting current backflow switch to be disconnected;
section 2 ice melting current on-off control module, section 2 main switch control circuit and section 2 ice melting current backflow switch circuit, and a main PLC control system in a traction substation is used for controlling the current backflow switch circuit according to a section ice melting enabling signal f 2 The control section 2 ice melting current on-off control module controls the section 2 main switch control circuit and the section 2 ice melting current reflux switch circuit to be conducted;
after the section 2 main switch control circuit is conducted, alternating current output by the section 2 three-phase transformer is transmitted to the section 2 step-down transformer through the section 2 main switch control circuit for step-down, then rectified by the section 2 rectifying circuit, filtered by the section 2 filtering circuit and inverted by the section 2 inverting circuit to become ice melting current within the bearing range of the section 2 contact net and the section 2 carrier cable;
the system comprises a section 2 ice melting current control module, a section 2 catenary current adjustable circuit and a section 2 catenary current adjustable circuit, wherein the section 2 environment monitoring module monitors the environment wind speed, the temperature and the humidity, and sends the section 2 control center, a section PLC control system of the section 2 control center judges the ice coating type and then sends the ice coating type to a total PLC control system in a traction substation, the total PLC control system calculates the proper ice melting current at the moment according to the ice coating type through real-time environment data and sends the proper ice melting current to the section 2 ice melting current control module, and sends an ice melting current analog control signal to a driving circuit after D/A conversion of a digital-to-analog circuit, the analog control signal is amplified to meet the value required by the section 2 catenary current adjustable circuit and the section 2 catenary current adjustable circuit, and the ice melting current output by a section 2 inverter circuit is regulated according to the required value to obtain the section 2 ice melting current and the catenary ice melting current and the section 2 catenary current and is respectively loaded on the section 2 catenary and the section 2 catenary;
section 2 carrier cable ice melting current reflux switch, and the total PLC control system is used for controlling the signal f according to section ice melting 2 The control section 2 ice melting current on-off control module controls the conduction of a carrier cable ice melting current reflux switch of the section 2, and simultaneously turns off a carrier cable bidirectional conduction control switch between the section 1 and the section 2, so that ice melting current loops of a step-down transformer-contact net-step-down transformer and a step-down transformer-carrier cable ice melting current reflux circuit-step-down transformer are formed in the section 2;
the section 2 ice melting condition judging module is used for sending tension and angle change information of the overhead line and the carrier rope to the section 2 ice melting condition judging module through the carrier rope tension and angle sensor of the section 2 in the ice melting process, judging whether the section ice melting is finished at the moment after receiving and processing of the tension angle receiver and the PLC control system, and sending a section 2 ice melting finishing signal to a total PLC control system in a traction substation if the section 2 ice melting is finished, wherein the total PLC control system controls a section 2 ice melting current on-off control module to control a section 2 total switch control circuit, a section 2 ice melting current backflow switch circuit and a section 2 carrier rope ice melting current backflow switch to be disconnected;
after the total PLC control system receives the ice melting ending signal of the section 1 and the ice melting ending signal of the section 2, the carrier rope bidirectional conduction control switch is conducted to prepare for the end of the empty window period, and at the moment, the ice melting is ended and the normal state is recovered.
2. The non-split phase section adjustable for catenary and catenary icing of claim 1The direct-current ice melting system is characterized in that the proper ice melting current is calculated according to the ice coating type through real-time environment data, and the proper ice melting current is as follows: according to the resistance R of the contact net and the carrier cable wires at 0 DEG C 0 Deicing time t r The difference delta t between the conductor temperature and the outside air temperature, the relative density g of the ice coating 0 The diameter D of the wire, the thickness b of the ice layer, the outer diameter D of the conductor after ice coating and the equivalent ice layer conduction thermal resistance R T0 Calculating the ice melting current under the corresponding natural environment;
specifically, the wire resistance R 0 Thermal conductivity lambda and equivalent ice layer conduction thermal resistance R T0 The larger the ice melting current is, the smaller the ice melting current is, and the ice removing time t is r The difference delta t between the conductor temperature and the outside air temperature, the relative density g of the ice coating 0 The larger the wire diameter D, the ice layer thickness b and the outer diameter D of the conductor after ice coating, the larger the ice melting current.
3. The non-split-phase region sectionally adjustable direct-current ice melting system suitable for catenary and catenary ice coating according to claim 1, wherein whether ice melting is finished is judged whether tension and angle change values of the catenary and the catenary are larger than a set threshold value of ice melting finish, and if the tension and angle change values are met, the ice melting is finished.
4. The non-split phase section adjustable direct current ice melting system suitable for catenary and catenary ice coating according to claim 1, wherein the catenary current adjustable circuit Xiang Chengli is used for outputting smaller current and the catenary current adjustable circuit is used for outputting larger current to the catenary in combination with the calculated ice melting current.
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| CN202211683098.6A CN115800169B (en) | 2022-12-27 | 2022-12-27 | Non-split-phase-area sectionally adjustable direct-current ice melting system applicable to overhead contact line and carrier cable ice coating |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101640400A (en) * | 2009-07-23 | 2010-02-03 | 中铁第一勘察设计院集团有限公司 | Ice melting method for overhead contact system of electrified railway and ice melting system thereof |
| CN102431468A (en) * | 2011-10-25 | 2012-05-02 | 成都交大许继电气有限责任公司 | Icing preventing and ice melting method for high speed railway and system for realizing method |
| WO2012173517A1 (en) * | 2011-06-14 | 2012-12-20 | Открытое Акционерное Общество "Федеральная Сетевая Компания Единой Энергетической Системы" (Оао "Фск Еэс") | Method for melting ice on the wires of a three-phase overhead power transmission line |
| WO2013067754A1 (en) * | 2011-11-09 | 2013-05-16 | 南方电网科学研究院有限责任公司 | Multi-functional direct current ice melting automatic switching circuit and switching method thereof |
| CN103247992A (en) * | 2013-05-07 | 2013-08-14 | 陈广生 | DC deicing method for overhead ground wires and OPGWs in electric transmission lines |
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2022
- 2022-12-27 CN CN202211683098.6A patent/CN115800169B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101640400A (en) * | 2009-07-23 | 2010-02-03 | 中铁第一勘察设计院集团有限公司 | Ice melting method for overhead contact system of electrified railway and ice melting system thereof |
| WO2012173517A1 (en) * | 2011-06-14 | 2012-12-20 | Открытое Акционерное Общество "Федеральная Сетевая Компания Единой Энергетической Системы" (Оао "Фск Еэс") | Method for melting ice on the wires of a three-phase overhead power transmission line |
| CN102431468A (en) * | 2011-10-25 | 2012-05-02 | 成都交大许继电气有限责任公司 | Icing preventing and ice melting method for high speed railway and system for realizing method |
| WO2013067754A1 (en) * | 2011-11-09 | 2013-05-16 | 南方电网科学研究院有限责任公司 | Multi-functional direct current ice melting automatic switching circuit and switching method thereof |
| CN103247992A (en) * | 2013-05-07 | 2013-08-14 | 陈广生 | DC deicing method for overhead ground wires and OPGWs in electric transmission lines |
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