CN107215246B - Intelligent ice melting system of contact network - Google Patents

Intelligent ice melting system of contact network Download PDF

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Publication number
CN107215246B
CN107215246B CN201710365417.1A CN201710365417A CN107215246B CN 107215246 B CN107215246 B CN 107215246B CN 201710365417 A CN201710365417 A CN 201710365417A CN 107215246 B CN107215246 B CN 107215246B
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CN
China
Prior art keywords
ice
control signal
current
converter
melting
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Application number
CN201710365417.1A
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Chinese (zh)
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CN107215246A (en
Inventor
张钢
胡志强
刘建
杨利强
徐树亮
刘志刚
牟富强
刘健
魏路
漆良波
吕海臣
邱瑞昌
杜军
路亮
陈杰
张馨予
孙星亮
Original Assignee
北京千驷驭电气有限公司
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Priority to CN201710365417.1A priority Critical patent/CN107215246B/en
Publication of CN107215246A publication Critical patent/CN107215246A/en
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Publication of CN107215246B publication Critical patent/CN107215246B/en

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60MPOWER SUPPLY LINES, AND DEVICES ALONG RAILS, FOR ELECTRICALLY- PROPELLED VEHICLES
    • B60M1/00Power supply lines for contact with collector on vehicle
    • B60M1/12Trolley lines; Accessories therefor
    • B60M1/28Manufacturing or repairing trolley lines
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02GINSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
    • H02G7/00Overhead installations of electric lines or cables
    • H02G7/16Devices for removing snow or ice from lines or cables

Abstract

The invention provides an intelligent catenary ice melting system which comprises an ice melting control device and N current transformation devices, wherein the N current transformation devices are connected with the ice melting control device; one end of the converter device is connected with a direct current contact network, and the other end of the converter device is connected with an alternating current power grid; the converter device is used for entering a rectification working condition according to a first control signal; entering an inversion working condition according to the second control signal; the ice melting control device is used for obtaining the first control signal and the second control signal and sending the first control signal and the second control signal to the current transformation device corresponding to the section to be melted; wherein the first control signal and the second control signal both comprise an ice-melting current value; energy circulation is formed among the converter device under the rectification working condition, the section to be ice-melted of the direct current catenary, the converter device under the inversion working condition and the corresponding section of the alternating current power grid, and the current of the section to be ice-melted of the direct current catenary is not less than the ice-melting current value.

Description

Intelligent ice melting system of contact network

Technical Field

The invention relates to the field of urban rail transit traction power supply, in particular to an intelligent overhead line system.

Background

The overhead line system is an important component of an urban rail transit traction power supply system and is a power transmission line which is suspended above a steel rail and provides electric energy for a train. The icing of the contact net refers to the phenomenon that water drops are condensed on a contact line after meeting cold air, so that the large-area contact line is wrapped by ice.

At present, the deicing method of the urban rail transit contact network mainly comprises an artificial deicing method, a contact network hot slip method and a thermal deicing method. Wherein, the manual deicing method is time-consuming and labor-consuming, has low deicing efficiency and has certain danger. The hot slip method of the contact net has certain damage to the contact net and can not completely remove the ice coating. The working principle of the thermal ice melting method is as follows: in the prior art, a set of large-capacity special direct-current adjustable power supply (thyristor controlled voltage regulation) is added in a substation, the contact net is in short circuit with a steel rail at a far-end place to form ice melting current, and then the purpose of melting ice is achieved through heat generated by the ice melting current.

However, in the existing equipment of the thermal ice melting method, a large-capacity direct-current adjustable power supply is controlled based on a thyristor, the harmonic content of alternating current is high, harmonic pollution can be caused to an alternating current power grid, and the equipment can only be used for melting ice, and has the advantages of single function, low utilization rate and poor cost performance.

Disclosure of Invention

The invention provides an intelligent ice melting system for an urban rail transit overhead line system, which aims to solve the problems of harmonic pollution and the like caused by a high-capacity direct-current adjustable power supply to an alternating-current power grid.

According to a first aspect of the invention, an intelligent catenary ice melting system is provided, which comprises an ice melting control device and N current transformation devices, wherein N is any integer greater than or equal to 2;

one end of the converter device is connected with a direct current contact network, and the other end of the converter device is connected with an alternating current power grid;

the converter device is used for entering a rectification working condition according to a first control signal; entering an inversion working condition according to the second control signal;

the ice melting control device is used for obtaining the first control signal and the second control signal and sending the first control signal and the second control signal to the current transformation device corresponding to the section to be melted; the first control signal and the second control signal both comprise an ice-melting current value;

so that one of the converter devices corresponding to the section to be melted with ice is in a rectification working condition, and the other converter device is in an inversion working condition; energy circulation is formed among the converter device under the rectification working condition, the section to be ice-melted of the direct current catenary, the converter device under the inversion working condition and the corresponding section of the alternating current power grid, and the current of the section to be ice-melted of the direct current catenary is not less than the ice-melting current value.

Optionally, the converter device is further configured to enter a reactive compensation working condition according to a third control signal.

Optionally, the system further includes:

the sensor network is used for acquiring monitoring information of the direct current contact network;

the ice melting control device is specifically configured to obtain the first control signal and the second control signal according to the monitoring information.

Optionally, the ice-melting current value is obtained according to the monitoring information.

Optionally, the monitoring information includes:

first information of an environment where the direct current contact network is located, and:

and second information of the direct current contact network image.

Optionally, the ice-melting control device is further configured to obtain an ice coating thickness according to the second information; and calculating the ice-melting current value according to the ice coating thickness and the first information.

Optionally, the ice melting control device is specifically configured to: and calculating to obtain the ice melting current value according to the first information, the ice coating thickness, the preset parameters of the direct current contact network and pre-input meteorological data.

Optionally, the first information includes at least one of:

(ii) temperature;

humidity;

wind speed.

Optionally, the converter device includes a transformer and a PWM converter;

the transformer is used for voltage conversion between the alternating current power grid and the alternating current side of the PWM converter. (ii) a

The PWM converter is used for:

receiving the first control signal or the second control signal;

entering a rectification working state according to the first control signal;

entering an inversion working state according to the second control signal;

and adjusting the output electric energy according to the ice melting current value so that the current of the section to be melted reaches the ice melting current value.

Optionally, the PWM converter includes a control circuit and a plurality of power switching devices;

the control circuit is used for generating a driving pulse according to the ice melting current value;

and the power switching devices are used for responding to the driving pulse and performing on or off action so as to adjust the size and/or direction of the output electric energy.

Optionally, the converter device further includes a first switch, a low-voltage circuit breaker, a pre-charging circuit, a second switch, and a disconnecting switch; the high-voltage side of the transformer is connected to the alternating-current power grid through the first switch, the low-voltage side of the transformer is connected to the alternating-current side of the PWM converter through the low-voltage circuit breaker, and the positive pole of the direct-current side of the PWM converter is connected to the direct-current contact net through the second switch; the negative electrode of the direct current side of the PWM converter is connected to a steel rail through the isolating switch; the pre-charging loop is connected in parallel to two ends of the low-voltage circuit breaker;

the first switch, the low-voltage circuit breaker, the second switch and the isolating switch are all used for responding to the first control signal or the second control signal and executing closing action.

In the intelligent ice melting system of the contact net, one end of the converter is connected with a direct current contact net, and the other end of the converter is connected with an alternating current power grid; the deflector is used for: entering a rectification working condition according to the first control signal; entering an inversion working condition according to the second control signal; the direct-current variable power supply ice melting device forms a path between an alternating-current power grid and a direct-current contact network, so that ice melting is realized, and because a high-capacity direct-current adjustable power supply is not adopted, and a variable-current device is adopted as a power supply for ice melting, the harmonic pollution to the alternating-current power grid is reduced. In the optional embodiment of the invention, when the ice melting requirement does not exist, the converter device can work in a rectification mode, an inversion mode and a reactive compensation mode according to the requirement, so that the power supply quality of a contact network is improved, the regenerative braking energy of the train is recycled, the power factor of the system is improved, and the multiple purposes of one machine are realized.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts;

fig. 1 is a schematic configuration diagram of a traction power supply system in the related art;

FIG. 2 is a schematic structural diagram of an intelligent ice melting system of a catenary of the invention;

FIG. 3 is a schematic control diagram of an intelligent ice melting system for a catenary of the present invention;

FIG. 4 is a schematic view of a deflector according to the present invention;

FIG. 5 is a flow diagram of an ice melting process in the present invention.

Description of reference numerals:

1-main substation;

2-a substation;

3-a rectifier unit;

4-steel rail;

5-a train;

6-alternating current power grid;

7-a direct current contact network;

8-a deflector;

81-a first switch; 82-a transformer; 83-low voltage circuit breaker; 84-a pre-charge loop; 85-PWM current transformer; 86-a second switch; 87-a disconnecting switch;

9-energy circulation;

10-sections to be de-iced;

11-ice melting control means;

12-sensor network.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The terms "first," "second," "third," "fourth," and the like in the description and in the claims, as well as in the drawings, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

The technical solution of the present invention will be described in detail below with specific examples. The following several specific embodiments may be combined with each other, and details of the same or similar concepts or processes may not be repeated in some embodiments.

Fig. 1 is a schematic configuration diagram of a traction power supply system in the related art; in the prior art, a traction power supply system may include a main substation 1, substations 2, an ac power grid 6, and a dc overhead line system 7, wherein in one scheme, 110KV is stepped down to 35KV through the main substation 1, and then is respectively transmitted to each substation 2 through the ac power grid 6, a rectifier unit 3 is disposed in the substation 2, in a power supply state, the rectifier unit 3 is configured to rectify ac power into dc power and then transmit the dc power to the dc overhead line system 7, and a train 5 on a steel rail 4 obtains the dc power through the dc overhead line system 7. On the basis, in the prior art, a set of large-capacity special direct-current adjustable power supply (thyristor controlled voltage regulation) is added to the substation 2, and the direct-current contact net 7 is short-circuited to the steel rail 4 at a far end to form ice melting current, so that ice melting is performed.

The rectifier unit 3 can adopt a 24-pulse rectifier, and is used for converting 35kV three-phase alternating current into 1500V or 750V direct current and transmitting the direct current to a direct current contact network 7 for use by the train 5.

FIG. 2 is a schematic structural diagram of an intelligent ice melting system of a catenary of the invention; FIG. 3 is a schematic control diagram of an intelligent ice melting system for a catenary of the present invention; referring to fig. 3, and being understood in combination with fig. 2, the present embodiment provides an intelligent catenary ice melting system, including an ice melting control device 11 and N current transformers 8, where N is any integer greater than or equal to 2;

one end of the converter device 8 is connected with a direct current contact network 7, and the other end of the converter device is connected with an alternating current power grid 6; in a specific embodiment, the direct current contact system 7 can be connected through a switching device;

the converter device 8 is used for entering a rectification working condition according to a first control signal; entering an inversion working condition according to the second control signal;

the ice melting control device 11 is configured to obtain the first control signal and the second control signal, and send the first control signal and the second control signal to the current transformation device 8 corresponding to the to-be-melted ice section 10; the first control signal and the second control signal both comprise an ice-melting current value;

so that one of the converter devices 8 corresponding to the section to be melted with ice 10 is in a rectification working condition, and the other converter device is in an inversion working condition; energy circulation 9 is formed among the converter device 8 under the rectification working condition, the converter device 8 under the inversion working condition, the section to be ice-melted 10 of the direct current catenary 7 and the corresponding section of the alternating current power grid 6, and the current of the section to be ice-melted 10 of the direct current catenary 7 is not less than the ice-melting current value. The current reaches the ice-melting current value, joule heat can be generated, and the purpose of ice melting is achieved.

According to the scheme, a path is formed between the alternating current power grid 6 and the direct current contact network 7, so that ice melting is realized, and the harmonic pollution to the alternating current power grid 6 is reduced because a large-capacity direct current adjustable power supply is not adopted and the converter device 8 is adopted as the power supply for ice melting.

Wherein, the section to be melted by ice 10 can be understood as a section having ice coating to be melted. For said section, it is understood that: two ends of each section are respectively connected with one converter device 8, adjacent converter devices 8 can be divided into one section, and between two converter devices 8 which are separated by one or more converter devices 8, the section can also be divided into one section, and the division of the section aims to determine the section 10 to be melted. In all the sections, the section with the ice coating to be melted can be understood as the section to be melted 10, and the ice coating part can be only a part of the section to be melted 10 or the whole section. Wherein, the current transformation device 8 corresponding to the section to be ice-melted 10 refers to the current transformation device 8 connected to the two ends of the section to be ice-melted 10; the corresponding section of the ac power network 6 refers to the section of the ac power network 6 between the inverters 8 connected across the section to be ice-melted 10.

Wherein the first control signal may be understood as a signal to drive into a commutation regime; the second control signal may be understood as a signal to drive into an inversion condition; the ice-melting current value is included, and the ice-melting time can also be included. The first control signal may further include information indicating that a rectification condition is entered, and the second control signal may further include information indicating that an inversion condition is entered.

Forming an energy cycle 9 means that current can circulate among the converter device 8 in the rectification condition, the section 10 to be ice-melted of the dc link system 7, the converter device 8 in the inversion condition, and the corresponding section of the ac power grid 6, which is a working principle in the ice-melting state, but not in the power supply state.

The communication network between the ice melting control device 11 and the converter device 8 adopts a PSCADA network, and functions of data transmission, equipment control and the like are realized.

FIG. 3 is a schematic control diagram of an intelligent ice melting system for a catenary of the present invention; FIG. 5 is a schematic flow diagram of an ice melting process in the present invention; referring to fig. 3 in combination with fig. 5, in the present embodiment, the system further includes:

the sensor network 12 is used for acquiring monitoring information of the direct current contact network 7; the monitoring information may refer to any information that can be obtained by monitoring the dc link system 7; the corresponding monitoring information can be selected based on different purposes.

The above functions, correspondingly, can be understood that the ice-melting process includes step S51: the sensor network 12 obtains monitoring information of the direct current contact network 7;

in a specific embodiment, the sensor network 12 may adopt a wireless multimedia sensor, and may include a plurality of groups of sensor nodes having computing, storing and communicating capabilities, the sensor nodes form a distributed sensing network, information such as temperature, humidity, wind speed and an image of a catenary in an environment around the catenary is obtained by means of sensor sensing on the nodes, and data is uploaded to the ice-melting control device 11 through a wireless module; the method can realize effective and quick acquisition and management of the sensing data.

The ice-melting control device 11 is specifically configured to obtain the first control signal and the second control signal according to the monitoring information. And the ice-melting current value is obtained according to the monitoring information. In addition, the ice-melting control device 11 is further configured to determine an icing state of the catenary, and may specifically include determining whether the icing state is the state (which may be understood as a state that determines whether ice needs to be melted) and determining information of the section to be melted in the section to be melted 10. If the ice melting is judged to be needed and the section to be melted with ice is determined to be 10, calculating the corresponding ice melting current value.

The scheme links ice melting control with monitoring of the sensor network 12, automatic ice melting control can be achieved, compared with a scheme of manual intervention operation in the prior art, the scheme can effectively improve the intelligent degree, selects a more accurate ice melting opportunity, achieves more accurate quantitative control, further improves ice melting efficiency, and saves energy consumption.

In one embodiment, the monitoring information includes:

the first information of the environment where the direct current contact network 7 is located, and:

and second information of the image of the direct current contact network 7.

Through the second information, whether ice is coated or not and the degree of ice coating can be known, and a basis is provided for calculating the ice-melting current value and judging whether ice melting is needed or not; through the first information, the subsequent calculation can comprehensively consider environmental factors, so that the ice melting current value under the corresponding ice melting time is calculated more accurately. The first information may include at least one of: (ii) temperature; humidity; wind speed.

In one embodiment, the ice-melting control device 11 is further configured to obtain an ice coating thickness according to the second information; and calculating the ice-melting current value according to the ice coating thickness and the first information. In another specific embodiment, the ice-melting control device 11 is specifically configured to: and calculating to obtain the ice melting current value according to the first information, the ice coating thickness, the preset parameters of the direct current contact net 7 and pre-input meteorological data. The preset parameters may refer to the relevant electrical parameters; in one embodiment, the ice-melting time is obtained while the ice-melting current value is obtained, and it is understood that the ice-melting time is also included in both the first control signal and the second control signal.

In a specific embodiment, the ice-melting control device 11 is specifically configured to extract a boundary contour of an ice-coated image of the catenary in the second information, calculate diameter information (number of pixels occupied) in the image after ice coating and diameter information (number of pixels occupied) when ice coating is not performed, and calculate the ice coating thickness of the contact line and the catenary by using a difference between pixels occupied before and after ice coating and a ratio between a diameter pixel value and an actual size. And (3) substituting related parameters such as temperature, wind speed, ice coating thickness, wire radius, contact line resistance, catenary resistance, ice melting expected time and the like into a preset calculation formula to obtain the ice melting current value of the catenary corresponding to the ice melting time.

Wherein, the meteorological data can be obtained from the Internet; the relevant electrical parameters, such as the direct current resistance of the contact wire and the catenary, and the like, can be input by a user through an input device.

The above functions, correspondingly, can be understood that the ice melting process includes:

s52: the ice melting control device 11 receives monitoring information sent by the sensor network 12;

s53: the ice melting control device judges whether ice melting is needed or not; if not, returning to step S51; if yes, go to step S54;

s54: the ice-melting control device 11 calculates the ice-melting current value at the corresponding ice-melting time;

s55; the ice melting control device 11 obtains the first control signal and the second control signal;

then, the two inverters 8 corresponding to the section to be melted with ice 10 respectively proceed to steps S56 and S57.

S56: one converter device 8 receives the first control signal and enters a rectification working condition;

s57: and the other converter device 8 receives the second control signal and enters an inversion working condition.

In order to realize the above-mentioned functions of the ice-melting control device 11, in one embodiment, the ice-melting control device 11 may specifically include a monitoring module, a calculating module, and a control module:

the monitoring module is configured to receive monitoring information sent by the sensor network 12, and determine an icing state of the catenary of the direct current catenary 7; when the icing state of the overhead contact system is a state needing ice melting, sending an ice melting instruction and the monitoring information to the computing module; the ice melting instruction can comprise information of the section to be melted 10;

the calculating module is used for responding to the ice melting instruction, calculating the ice melting current value of the corresponding section to be ice-melted 10 at the corresponding ice melting time according to the monitoring information, and sending the ice melting current value and the ice melting time to the control module;

and the control module is configured to receive the ice-melting current value and the ice-melting time, and send the first control signal or the second control signal to the current converting device 8 corresponding to the section to be ice-melted 10.

Further, the system may further include:

the network module is used for acquiring the meteorological data from the internet and sending the meteorological data to the computing module;

the setting module is used for receiving the electric parameters input by a user and sending the electric parameters to the calculating module;

a display module: the system is used for displaying real-time meteorological conditions, collected information, the working state of the ice melting system and the like;

a data module: for data analysis, storage and processing, the user can manage the data as required.

The monitoring module, the calculating module and the control module may be program modules which are recorded in the memory and are called by the processor to realize corresponding functions, or may be circuit modules which are used for realizing corresponding functions.

In one embodiment, the converter device 8 may further have a reactive compensation working condition besides an inversion working condition and a rectification working condition, and in this embodiment, the converter device 8 is further configured to enter the reactive compensation working condition according to a third control signal. The third control signal may be understood as a signal intended to change the operating condition of the converter device 8 into a reactive compensation operating condition. Through reactive compensation working condition, can carry out reactive compensation to exchanging the looped netowrk to realize a tractor serves several purposes, improve deflector 8's utilization ratio.

As for the rectification working condition, the inversion working condition and the reactive compensation working condition, it can be understood that they are all the circuits of the converter device 8 itself, and corresponding to different working conditions, different working states that the PWM converter 85 can realize, for example, the rectification working condition corresponds to the rectification working state, the inversion working condition corresponds to the inversion working state, and by controlling the switching devices therein, the functions of different working conditions can be realized respectively, and it does not depart from the description of the current converter device 8 or the general functions of the converter in the related art.

For the reactive compensation condition, in an embodiment, it may be understood that reactive compensation for the ac power grid 6 is implemented by using a reactive power generation function of the converter device 8, and in a specific implementation process, it may be understood that zero power factor pure inductive operation (equivalently, an inductance with an adjustable batvalue) or zero power factor pure capacitive operation (equivalently, an amplitude-adjustable capacitor) of the converter device 8 is performed to compensate for an influence of a capacitive load or an inductive load on a power factor of the ac power grid 6. The control logic for reactive power compensation may be written in the controller or determined according to preset quantization data.

In addition, the converter device 8 can also be used for feeding back the regenerative braking energy of the train 5 to the ac medium-voltage power grid, and can also assist the rectifier unit 3 to perform traction rectification power supply, which can actually be understood as realizing inversion and rectification functions respectively, but the working output power and the control logic are different. It can further realize a tractor serves several purposes, improves the utilization ratio of deflector 8.

Therefore, when the ice melting requirement does not exist, the converter device 8 can work in a rectification mode, an inversion mode and a reactive compensation mode according to the requirement, so that the power supply quality of a contact network is improved, the recycling of the regenerative braking energy of the train 5 is realized, the power factor of the system is improved, and the multiple purposes of one machine are realized.

Fig. 4 is a schematic view of the construction of a deflector 8 according to the invention; referring to fig. 4, the inverter device 8 may include a transformer 82 and a PWM inverter 85;

the transformer 82 is used for performing voltage conversion between the alternating current power grid 6 and the alternating current side of the PWM converter 85;

the PWM converter 85 is configured to:

receiving the first control signal or the second control signal;

entering a rectification working state according to the first control signal;

entering an inversion working state according to the second control signal;

and adjusting the output electric energy according to the ice melting current value so that the current of the section to be ice-melted 10 reaches the ice melting current value.

In one embodiment, the PWM converter 85 includes a control circuit and a plurality of power switching devices;

the control circuit is used for generating a driving pulse according to the ice melting current value;

and the power switching devices are used for responding to the driving pulse and performing on or off action so as to adjust the size and/or direction of the output electric energy. The PWM converters 85 in the art generally include power switching devices, and the output power can be adjusted by turning on and off the power switching devices.

The converter device 8 may be a four-quadrant converter device, specifically a three-phase PWM converter, which is based on a pulse width modulation technique and current closed-loop control based on a synchronous rotating coordinate system, and can realize four-quadrant operation, and operate in working conditions such as rectification, inversion, reactive compensation, and the like.

The power switching devices in the PWM converter 85 may be fully-controlled power devices, such as IGBTs. When the first control signal and the second control signal are not received, the four-quadrant converter device is in an exit state, all the switches and the circuit breakers are in an off state, and the IGBT driving pulse is in a blocking state. After receiving the first control signal or the second control signal, the four-quadrant converter device is put into operation, all switches and the circuit breaker are closed, and according to the given value of the ice melting current, a PWM (pulse width modulation) technology is adopted to generate driving pulses to drive the IGBT (insulated gate bipolar translator) to work, so that the size and the direction of energy transmitted by the four-quadrant converter device are controlled.

Referring to fig. 4, in one embodiment, the converter device 8 further includes a first switch 81, a low-voltage circuit breaker 83, a pre-charge circuit 84, a second switch 86, and a disconnecting switch 87; the high-voltage side of the transformer 82 is connected to the ac power grid 6 through the first switch 81, the low-voltage side of the transformer 82 is connected to the ac side of the PWM converter 85 through the low-voltage circuit breaker 83, and the positive pole of the dc side of the PWM converter 85 is connected to the dc contact network 7 through the second switch 86; the negative electrode of the direct current side of the PWM converter 85 is connected to the steel rail 4 through an isolating switch 87; the pre-charging loop 84 is connected in parallel to two ends of the low-voltage circuit breaker 83; the first switch 81, the low-voltage circuit breaker 83, the second switch 86 and the isolating switch 87 are all used for responding to the first control signal or the second control signal and executing closing action. It is to be understood that the closing action is performed when the first control signal is received, and the closing action is performed when the second control signal is received, but not both, and the first control signal or the second control signal is referred to as "first control signal" or "second control signal" is intended to mean that only one control signal can be responded to.

In a specific use scene, when the urban rail transit is operated in daytime, the train 5 runs frequently, so that the probability of icing of a contact net is low. After the vehicle is stopped at night, no current flows on the contact net, and icing is easy to occur under severe meteorological conditions (such as the temperature is lower than 0 ℃, the relative humidity of air is higher than 80 percent, and the wind speed is higher than 1 m/s). Once the icing disaster of the contact network occurs, the ice melting control system can react, and the icing of the contact network is melted before the first train is on-line in the early morning. Under the condition that the ice melting current does not exceed the rated current, the larger the ice melting current is, the shorter the required ice melting time is, and the higher the efficiency is.

In addition, the method shown in this embodiment can be correspondingly applied to implement the technical solution of the embodiment of the apparatus shown in fig. 2, and the implementation principle, technical effect and meaning of the terms are similar, which is not described herein again.

Those of ordinary skill in the art will understand that: all or a portion of the steps of implementing the above-described method embodiments may be performed by hardware associated with program instructions. The program may be stored in a computer-readable storage medium. When executed, the program performs steps comprising the method embodiments described above; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks.

Finally, it should be noted that: the above embodiments are only used for illustrating the technical solution of the present invention, and not for limiting the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (8)

1. An intelligent catenary ice melting system is characterized by comprising an ice melting control device and N current transformation devices, wherein N is any integer greater than or equal to 2;
one end of the converter device is connected with a direct current contact network, and the other end of the converter device is connected with an alternating current power grid;
the converter device is used for entering a rectification working condition according to a first control signal; entering an inversion working condition according to the second control signal;
the ice melting control device is used for obtaining the first control signal and the second control signal and sending the first control signal and the second control signal to the current transformation device corresponding to the section to be melted; wherein the first control signal and the second control signal both comprise an ice-melting current value;
so that one of the converter devices corresponding to the section to be melted with ice is in a rectification working condition, and the other converter device is in an inversion working condition; energy circulation is formed among the converter device under the rectification working condition, the section to be ice-melted of the direct current catenary, the converter device under the inversion working condition and the corresponding section of the alternating current power grid, and the current of the section to be ice-melted of the direct current catenary is not less than the ice-melting current value;
further comprising: the sensor network is used for acquiring monitoring information of the direct current contact network;
the ice melting control device is specifically configured to obtain the first control signal and the second control signal according to the monitoring information;
wherein the monitoring information comprises:
first information of an environment where the direct current contact network is located, and:
and second information of the direct current contact network image.
2. The system of claim 1, wherein the variable flow device is further configured to enter a reactive compensation mode based on a third control signal.
3. The system of claim 1, wherein the ice melting control device is further configured to obtain an ice coating thickness based on the second information; and calculating the ice-melting current value according to the ice coating thickness and the first information.
4. The system of claim 3, wherein the ice-melt control device is specifically configured to: and calculating to obtain the ice melting current value according to the first information, the ice coating thickness, the preset parameters of the direct current contact network and pre-input meteorological data.
5. The system of claim 1, wherein the first information comprises at least one of:
(ii) temperature;
humidity;
wind speed.
6. The system according to claim 1 or 2, wherein the current transformation device comprises a transformer and a Pulse Width Modulation (PWM) current transformer;
the transformer is used for performing voltage conversion between the alternating current power grid and the alternating current side of the PWM converter;
the PWM converter is used for receiving the first control signal or the second control signal; entering a rectification working state according to the first control signal; entering an inversion working state according to the second control signal;
and adjusting the output electric energy according to the ice melting current value so that the current of the section to be melted reaches the ice melting current value.
7. The system of claim 6, wherein the PWM converter comprises a control circuit and a plurality of power switching devices;
the control circuit is used for generating a driving pulse according to the ice melting current value;
and the power switching devices are used for responding to the driving pulse and performing on or off action so as to adjust the size and/or direction of the output electric energy.
8. The system of claim 7, wherein the variable current device further comprises a first switch, a low voltage circuit breaker, a pre-charge circuit, a second switch, and a disconnector; the high-voltage side of the transformer is connected to the alternating-current power grid through the first switch, the low-voltage side of the transformer is connected to the alternating-current side of the PWM converter through the low-voltage circuit breaker, and the positive pole of the direct-current side of the PWM converter is connected to the direct-current contact net through the second switch; the negative electrode of the direct current side of the PWM converter is connected to a steel rail through the isolating switch; the pre-charging loop is connected in parallel to two ends of the low-voltage circuit breaker;
the first switch, the low-voltage circuit breaker, the second switch and the isolating switch are all used for responding to the first control signal or the second control signal and executing closing action.
CN201710365417.1A 2017-05-22 2017-05-22 Intelligent ice melting system of contact network CN107215246B (en)

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