Mobile ice melting device for overhead contact network in urban rail transit depots

Abstract

The present invention discloses a mobile de-icing device for overhead contact lines in urban rail transit vehicle depots. The device comprises a mobile de-icing vehicle with a self-powered power supply, a constant power voltage regulation system, an internal harmonic elimination transformer system, a DC de-icing rectifier system, an ice-melting circuit parameter measurement system, and an ice-melting access system. The output of the mobile de-icing vehicle with a self-powered power supply is connected to the input of the constant power voltage regulation system, the output of the constant power voltage regulation system is connected to the input of the internal harmonic elimination transformer system, the output of the internal harmonic elimination transformer system is connected to the input of the DC de-icing rectifier system, the output of the DC de-icing rectifier system is connected to the input of the ice-melting circuit parameter measurement system, the output of the ice-melting circuit parameter measurement system is connected to the input of the ice-melting access system, and the output of the ice-melting access system is connected to the contact wire to be de-iced in the overhead contact line of an urban rail transit vehicle depot. The present invention can meet the de-icing requirements for contact lines within a vehicle depot with a length of less than 1 km.

Description

Technical Field

[0001] The invention relates to a power grid ice melting device, in particular to a mobile ice melting device for an overhead contact network of an urban rail transit vehicle depot. Background Art

[0002] The overhead catenary is the main structure of urban rail transit electrification projects. It is a special form of transmission line erected above the tracks to supply power to electric locomotives such as subways, and is the power source for their reliable operation. Rain, snow, and freezing disasters are frequent in southern my country. When the overhead catenary of urban rail transit is covered with ice in winter, it is difficult for the traction system to obtain power, affecting the normal operation of subways and other vehicles, and causing significant impacts on urban residents' travel. In November 2020, heavy to severe snowstorms occurred in central and northern Jilin Province. The catenary of Changchun Rail Transit Lines 3, 4, and 8 was severely covered with ice, which could not be quickly de-iced. As a result, Lines 3, 4, and 8 were temporarily suspended, causing a large number of passengers to be stranded, with significant social impact.

[0003] Currently, a large number of high-efficiency AC / DC de-icing devices are in use in power grids. Every winter, numerous ice-covered lines undergo de-icing operations, providing a solid technical guarantee for the safe and stable winter operation of power grids. However, the conductor types, line structures, and power supply methods of power grids differ significantly from those of electrified railways or urban rail transit. Therefore, DC de-icing devices for power grids cannot be directly used for de-icing overhead catenaries. Existing DC de-icing devices for power grids are directly used to de-ice overhead catenaries in urban rail transit depots, but this presents the following problems: 1. Power grid de-icing devices are large in size, have high capacity, and require long ice-melting distances, making them difficult to meet the requirements for de-icing within 1 km of depot catenaries. 2. Power grid de-icing devices require in-station power supply, while depot catenaries are complex and widely distributed. Temporary power connection during de-icing is labor-intensive, making it difficult to meet the requirements for rapid de-icing within the limited operating time of the catenary. 3. Power grid lines can de-icing over distances of at least several kilometers, requiring no initial adjustment of the de-icing current. However, the de-icing distance of depot catenaries can be as short as tens of meters, requiring initial adjustment of the de-icing current, which complicates de-icing device design. Problem 4: The large number of wire clamps connecting the catenary and catenary cables necessitates dynamic monitoring of the impact of ice melting on the catenary to ensure rapid operation of subway and other rail transit systems after ice thaw. This significantly increases the difficulty of designing an ice-melting device. Therefore, given the unique characteristics of de-icing overhead catenary systems in vehicle depots, there is an urgent need to research dedicated, self-powered, mobile ice-melting devices for urban rail transit depots. These devices should meet the de-icing requirements of overhead catenary systems in vehicle depots and provide guidance for the design and final development of these devices, effectively addressing the de-icing issue. Summary of the Invention

[0004] The present invention provides a mobile ice-melting device for an overhead contact line of an urban rail transit vehicle depot, which is used to solve the technical problem of ice melting of the contact line of the vehicle depot.

[0005] In order to solve the above technical problems, the technical solution proposed by the present invention is:

[0006] A mobile ice melting device for an overhead contact network in an urban rail transit vehicle depot, comprising:

[0007] Mobile ice-melting vehicle with its own power supply, constant power voltage regulation system, internal harmonic elimination transformer system, DC ice-melting rectification system, ice-melting circuit parameter measurement system and ice-melting access system;

[0008] The output end of the mobile ice-melting vehicle with its own power supply is connected to the input end of the constant power voltage regulation system, the output end of the constant power voltage regulation system is connected to the input end of the internal harmonic elimination transformer system, the output end of the internal harmonic elimination transformer system is connected to the input end of the DC ice-melting rectifier system, the output end of the DC ice-melting rectifier system is connected to the input end of the ice-melting circuit parameter measurement system, the output end of the ice-melting circuit parameter measurement system is connected to the input end of the ice-melting access system, and the output end of the ice-melting access system is connected to the contact line to be melted of the overhead contact network of the urban rail transit vehicle depot.

[0009] As a further improvement of the method of the present invention:

[0010] Preferably, the constant power voltage regulation system includes a detection module and three voltage comparators connected in parallel. The detection module is used to take the B phase from the generator output voltage at the output end of the mobile ice-melting vehicle with its own power supply, perform detection, and then send it to the three voltage comparators; the following voltage outputs are achieved through the three voltage comparators and the relay:

[0011] When the generator output voltage is between 242V and 180V, select the 220V gear;

[0012] When the generator output voltage is between 180V and 125V, select the 150V gear;

[0013] When the generator output voltage is between 125V and 85V, select the 100V gear;

[0014] When the generator output voltage is lower than 85V, select the 50V gear.

[0015] Preferably, the internal harmonic elimination transformer system adopts a winding method of multiple windings with segmented transposition so that the internal winding harmonics cancel each other out.

[0016] Preferably, the DC ice melting rectifier system comprises: two independent six-pulse air-cooled rectifiers; each six-pulse rectifier is connected to an AC power source, and after rectification, the positive and negative electrodes of the two six-pulse air-cooled rectifiers are connected in series or in parallel to form a series twelve-pulse rectifier or a parallel twelve-pulse rectifier;

[0017] Preferably, each six-pulse rectifier is equipped with a DC current transformer for displaying the output current of each bridge respectively; a voltage transformer and a DC current transformer are arranged on the ice-melting busbar for measuring the DC output voltage and the total DC output current of the twelve-pulse rectifier.

[0018] The present invention has the following beneficial effects:

[0019] 1. The mobile de-icing device for the overhead contact network of an urban rail transit vehicle depot of the present invention realizes internal cancellation of de-icing rectification harmonics, solves the problem of adding a huge filtering system to the rectification, and meets the miniaturization design requirements of the mobile de-icing device for the overhead contact network of an urban rail transit vehicle depot; adopts a mobile de-icing vehicle with its own power supply to solve the problem of obtaining power for de-icing in the vehicle depot, and meets the requirement of fast de-icing within a limited operating time of the contact lines with complex structures and a wide distribution range; adopts a constant power voltage regulation system to solve the problem of the de-icing current needing to be adjusted from zero, and meets the requirement that the de-icing distance of the contact line in the vehicle depot may be as short as tens of meters; utilizes the design of the de-icing circuit parameter measurement system to dynamically monitor the impact of de-icing on the contact network during de-icing, and achieves the requirement that the subway and other rail transit can be quickly put into operation after the de-icing. The present invention can meet the requirements for de-icing contact lines within a length of 1 km in a vehicle depot. The device is small in size, has its own power supply, and can adjust the de-icing current from zero. During de-icing, the insulation and resistance of the de-icing contact line can be dynamically monitored, and the impact of de-icing on the contact line can be judged in real time. It provides effective guidance for the design of a mobile de-icing device with its own power supply dedicated for overhead contact lines in vehicle depots, and can be widely applied to the design of DC de-icing devices for overhead contact lines.

[0020] In addition to the above-described objects, features and advantages, the present invention has other objects, features and advantages. The present invention will be further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings, which constitute part of this application, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0022] Figure 1 1 is a structural schematic diagram of a mobile ice melting device for an overhead contact network of an urban rail transit vehicle depot according to a preferred embodiment of the present invention;

[0023] Figure 2 It is the schematic diagram of a mobile ice melting vehicle with its own power supply;

[0024] Figure 3 This is the schematic diagram of the constant power voltage regulation system;

[0025] Figure 4 This is the schematic diagram of the internal harmonic elimination transformer system;

[0026] Figure 5This is the schematic diagram of the DC ice melting rectifier system.

[0027] The numbers in the figure represent:

[0028] 1. Mobile ice-melting vehicle with its own power supply; 2. Constant power voltage regulation system; 3. Internal harmonic elimination transformer system; 4. DC ice-melting rectification system; 5. Ice-melting circuit parameter measurement system; 6. Ice-melting access system. DETAILED DESCRIPTION

[0029] The embodiments of the present invention are described in detail below with reference to the accompanying drawings. However, the present invention can be implemented in many different ways as defined and covered by the claims.

[0030] See also Figure 1 The mobile ice-melting device for the overhead contact network of an urban rail transit vehicle depot of the present invention comprises: a mobile ice-melting vehicle 1 with a self-powered power supply, a constant power voltage regulation system 2, an internal harmonic elimination transformer system 3, a DC ice-melting rectifier system 4, an ice-melting circuit parameter measurement system 5, and an ice-melting access system 6; wherein, the output end of the mobile ice-melting vehicle 1 with a self-powered power supply is connected to the input end of the constant power voltage regulation system 2, the output end 2 of the constant power voltage regulation system is connected to the input end of the internal harmonic elimination transformer system 3, the output end of the internal harmonic elimination transformer system 3 is connected to the input end of the DC ice-melting rectifier system 4, the output end of the DC ice-melting rectifier system 4 is connected to the input end of the ice-melting circuit parameter measurement system 5, the output end of the ice-melting circuit parameter measurement system 5 is connected to the input end of the ice-melting access system 6, and the output end of the ice-melting access system 6 is connected to the contact line to be de-iced of the overhead contact network of the urban rail transit vehicle depot.

[0031] The dedicated mobile ice-melting device with its own power supply for the overhead contact network of the urban rail transit vehicle depot realizes internal cancellation of ice-melting rectification harmonics through the internal harmonic elimination transformer system 3; the mobile ice-melting vehicle 1 with its own power supply meets the requirement of rapid ice melting within the limited operating time of the contact line of the vehicle depot; the constant power voltage regulation system 2 meets the requirement of ice melting of the contact line as short as tens of meters in the vehicle depot; and the ice-melting circuit parameter measurement system 5 realizes the requirement of dynamic monitoring of the impact of ice melting on the contact network during ice melting.

[0032] The components used in this embodiment are from the following sources: the ice melting circuit parameter measurement system 5 adopts a commercially available 10V-RBCLXT ice melting circuit parameter measurement system, and the ice melting access system 6 adopts a commercially available 1kV-RBJRQ ice melting access system.

[0033] In this embodiment, the mobile ice melting vehicle 1 with its own power supply has its own generator set, and its principle is as follows Figure 2 As shown; the output voltage is 380-420V, which meets the power output requirements for de-icing overhead contact lines in vehicle depots.

[0034] In this embodiment, the principle of the constant power voltage regulation system 2 is as follows Figure 3As shown in the figure, the constant power voltage regulation system takes the B phase from the voltage output after voltage regulation, performs detection and sends it to three voltage comparators. When the generator output voltage is 242V~180V, the 220V gear is selected; when it is 180V~125V, the 150V gear is selected; when it is 125V~85V, the 100V gear is selected; when it is lower than 85V, the 50V gear is selected to ensure that the three-phase voltage connected to the original generator controller is not lower than 180V and the shutdown occurs.

[0035] In this embodiment, the principle of the internal harmonic elimination transformer system 3 is as follows: Figure 4 As shown in the figure, the transformer internal winding harmonics are offset against each other, which can achieve internal offset of odd harmonics such as the 5th, 7th, and 9th during ice melting rectification, reducing the impact of harmonics on the generator set.

[0036] In this embodiment, the principle of the DC ice melting rectifier system 4 is as follows: Figure 5 As shown, the DC ice-melting rectifier system consists of two independent six-pulse air-cooled rectifiers. Each six-pulse rectifier is connected to an AC power source. After rectification, the positive and negative terminals are led out separately. Copper busbars are used outside the system to connect the positive and negative terminals of the two rectifiers in series or parallel, thus forming a series twelve-pulse rectifier or a parallel twelve-pulse rectifier. Each six-pulse rectifier is equipped with a DC current transformer to display the output current of each bridge. A voltage transformer and a DC current transformer are installed on the ice-melting busbar to measure the DC output voltage and total DC output current of the twelve-pulse rectifier.

[0037] In summary, the present invention can meet the requirements for de-icing contact lines within a length of 1 km in a vehicle depot. The device is small in size, has its own power supply, and can adjust the de-icing current from zero. During de-icing, the insulation and resistance of the de-icing contact line can be dynamically monitored, and the impact of de-icing on the contact line can be judged in real time. It provides effective guidance for the design of a mobile de-icing device with its own power supply dedicated to the overhead contact line in the vehicle depot, and can be widely applied to the design of DC de-icing devices for overhead contact lines.

[0038] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A mobile ice melting device for overhead contact network of urban rail transit vehicle depot, characterized in that: include: Mobile ice-melting vehicle with its own power supply, constant power voltage regulation system, internal harmonic elimination transformer system, DC ice-melting rectification system, ice-melting circuit parameter measurement system and ice-melting access system; The output end of the mobile ice-melting vehicle with its own power supply is connected to the input end of the constant power voltage regulation system, the output end of the constant power voltage regulation system is connected to the input end of the internal harmonic elimination transformer system, the output end of the internal harmonic elimination transformer system is connected to the input end of the DC ice-melting rectifier system, the output end of the DC ice-melting rectifier system is connected to the input end of the ice-melting circuit parameter measurement system, the output end of the ice-melting circuit parameter measurement system is connected to the input end of the ice-melting access system, and the output end of the ice-melting access system is connected to the contact wire to be melted of the overhead contact network of the urban rail transit vehicle depot; The constant power voltage regulation system includes a detection module and three voltage comparators connected in parallel. The detection module is used to take the B phase output voltage from the generator output terminal of the mobile ice-melting vehicle with its own power supply, perform detection, and then send it to the three voltage comparators. The following voltage outputs are achieved through the three voltage comparators and relays: When the generator output voltage is between 242V and 180V, select the 220V gear; When the generator output voltage is between 180V and 125V, select the 150V gear; When the generator output voltage is between 125V and 85V, select the 100V gear; When the generator output voltage is lower than 85V, select 50V gear; The ice melting circuit parameter measurement system is used to dynamically monitor the insulation and resistance of the contact line during ice melting to determine the impact of ice melting on the contact line in real time.

2. The mobile ice melting device for overhead contact network of urban rail transit vehicle depot according to claim 1 is characterized in that: The internal harmonic elimination transformer system adopts a winding method of multiple windings in segmented transposition to make the internal winding harmonics cancel each other out.

3. The mobile ice melting device for overhead contact network of urban rail transit vehicle depot according to claim 1 is characterized in that: The DC ice-melting rectifier system includes two independent six-pulse air-cooled rectifiers. Each six-pulse rectifier is connected to an AC power source. After rectification, the positive and negative poles of the two six-pulse air-cooled rectifiers are connected in series or in parallel to form a series twelve-pulse rectifier or a parallel twelve-pulse rectifier.

4. The mobile ice melting device for overhead contact network of urban rail transit vehicle depot according to claim 3 is characterized in that: Each six-pulse rectifier is equipped with a DC current transformer to display the output current of each bridge respectively; a voltage transformer and a DC current transformer are configured on the ice-melting bus to measure the DC output voltage and total DC output current of the twelve-pulse rectifier.

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