Auxiliary power supply system for dual-electric trains.

Abstract

Invention details;

Description

A dual-current train auxiliary power supply system

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to the Chinese patent application with application number 2023116386133 filed with the Chinese Patent Office on December 1, 2023, entitled “A Dual-current Train Auxiliary Power Supply System”, the entire contents of which are incorporated by reference into this application. Technical Field

[0003] The present application relates to the field of rail transportation, and in particular to a dual-current train auxiliary power supply system. Background Art

[0004] With the rapid development of urban rail transit and the gradual interconnection of intercity rail networks, dual-flow trains have emerged. These trains are different from traditional urban trains. Specifically, traditional urban trains generally use either DC or AC power, while dual-flow trains use either DC or AC power, depending on local conditions.

[0005] Although the power supply differs, dual-flow trains, like traditional city trains, utilize a power supply not only for the traction system but also for other components involved in train operation. Power-consuming components during train operation can be categorized into three main categories: air conditioning systems, AC load components, and DC load components. Therefore, dual-flow trains, like traditional city trains, require an auxiliary power supply system to power these components.

[0006] Summary of the Invention

[0007] In view of this, the purpose of this application is to provide a dual-current train auxiliary power supply system, which has a simpler power conversion link, higher conversion efficiency and lighter weight than the traditional auxiliary power supply system.

[0008] In an embodiment of the present application, a dual-current train auxiliary power supply system is provided, comprising a pantograph, a traction transformer, a traction converter, and a fusion power supply module;

[0009] The pantograph input side is connected to the power grid and the output side is connected to the traction transformer;

[0010] The output side of the traction transformer is connected to the traction converter;

[0011] The output side of the traction converter is connected to the fusion power supply module;

[0012] The output side of the integrated power supply module is connected to the air conditioner input side, the DC load input side, and the AC load input side.

[0013] Furthermore, the traction transformer is used to convert high voltage AC voltage into medium voltage AC voltage.

[0014] Furthermore, the traction converter is used to convert the medium voltage AC voltage into a high voltage DC voltage.

[0015] Furthermore, the fusion power supply module is used to convert the high-voltage direct current voltage into a low-voltage alternating current voltage and convert the high-voltage direct current voltage into a low-voltage direct current voltage.

[0016] Furthermore, the low-voltage DC voltage can be used to power a DC load, and the low-voltage AC voltage includes an AC voltage that can be used to power an air conditioner and an AC voltage that can be used to power an AC load.

[0017] Furthermore, the pantograph can receive AC 25kV alternating voltage or DC 1500V direct voltage.

[0018] Furthermore, the voltage range of the high voltage AC voltage is AC 22kV to AC 29kV, the voltage range of the medium voltage AC voltage is AC 900V to AC 1200V, the voltage range of the high voltage DC voltage is DC 1000V to DC 1950V, the voltage range of the low voltage AC voltage is AC 0V to AC 380V, and the voltage range of the low voltage DC voltage is DC 0V to DC 110V.

[0019] Furthermore, each vehicle is provided with at least two of the integrated power supply modules, which are redundant with each other.

[0020] Furthermore, after the fusion power supply module converts the high-voltage DC voltage into a low-voltage DC voltage, the low-voltage DC voltage is only output at the front of the vehicle; after the fusion power supply module converts the high-voltage DC voltage into a load low-voltage AC voltage, the load low-voltage AC voltage is only output at the middle vehicle.

[0021] Furthermore, a battery is connected between the fusion power supply module and the DC load input side.

[0022] The beneficial effects that this application can achieve:

[0023] 1. Compared with traditional auxiliary power supply systems, this system eliminates the need for electric heaters, auxiliary converters, and three-phase 380V busbars, reducing the weight of each train by approximately 4,200 kg and lowering energy consumption by 1.2%.

[0024] 2. After adopting the integrated power supply module, the train reduces the inverter link and the air conditioner eliminates the intermediate rectification link, and the overall system efficiency can be improved by about 9%;

[0025] 3. Since each train has two integrated power supply modules, they are mutually redundant, improving the stability and reliability of the power supply system;

[0026] 4. Compared with the traditional AC auxiliary power supply solution, the integrated power supply module adopts a DC1500V power supply system and forms multiple microgrid systems. The DC grid will not generate AC harmonic problems.

[0027] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] FIG1 is a schematic diagram of the auxiliary power supply system for dual-current trains according to the present invention.

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0030] Explanation of main component symbols: 1- pantograph; 2- traction transformer; 3- traction converter; 4- integrated power supply module. DETAILED DESCRIPTION

[0031] The term "comprising" in the specification, claims, and drawings of this application is synonymous with "including," "containing," or "characterized by," and is inclusive or open-ended and does not exclude additional unrecited elements or method steps. "Comprising" is a technical term used in claim language to mean that the recited elements are present, but other elements may be added and still form a structure or method within the scope of the claim.

[0032] In order to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention is described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, in the absence of conflict, the embodiments of the present application and the features therein may be combined with each other.

[0033] The following description sets forth numerous specific details to facilitate a thorough understanding of the present invention. The embodiments described are merely some, not all, of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are intended to fall within the scope of protection of the present invention.

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in this specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0035] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0036] Referring to Figure 1, a dual-current train auxiliary power supply system includes a pantograph 1, a traction transformer 2, a traction converter 3 and a fusion power supply module 4; the input side of the pantograph 1 is connected to the power grid, and the output side of the pantograph 1 is connected to the traction transformer 2 via a high-voltage box and a high-voltage distribution box; the output side of the traction transformer 2 is connected to the traction converter 3; the output side of the traction converter 3 is connected to the fusion power supply module 4; the output side of the fusion power supply module 4 is connected to the air conditioning input side, the DC load input side, and the AC load input side.

[0037] Traction transformer 2 is used to convert high-voltage AC voltage to medium-voltage AC voltage. The high-voltage AC voltage ranges from AC22kV to AC29kV. The medium-voltage AC voltage ranges from AC900V to AC1200V.

[0038] The traction converter 3 is used to convert the medium voltage AC voltage into a high voltage DC voltage. The high voltage DC voltage has a voltage range of DC 1000V to DC 1950V.

[0039] Low voltage AC voltage includes AC voltage that can be used to power air conditioners and AC voltage that can be used to power AC loads. The power supply voltage range is 0V to 380V.

[0040] The pantograph 1 can receive AC25kV AC voltage or DC1500V DC voltage.

[0041] When pantograph 1 receives 25kV AC voltage, the 25kV AC voltage is input to traction transformer 2, which converts the 25kV AC voltage to 1000V AC voltage and outputs it to traction converter 3. Traction converter 3 includes a rectifier module that can convert the 1000V AC voltage to 1500V DC voltage.

[0042] The fusion power supply module 4 can convert the DC 1500V direct voltage output by the traction converter 3 into AC 380V, thereby powering the air-conditioning inverter; the fusion power supply module 4 can also convert the DC 600V direct voltage into AC 380V (i.e., load low-voltage AC voltage), thereby powering the AC load; the fusion power supply module 4 can also convert the DC 1500V direct voltage output by the traction converter 3 into DC 110V (i.e., load low-voltage DC voltage), thereby powering the DC load.

[0043] When the pantograph 1 receives a DC 1500V voltage, it directly outputs it to the fusion power supply module 4. The fusion power supply module 4 can convert the DC 1500V voltage into DC 110V (i.e., the load low-voltage DC voltage) to power the DC load; the fusion power supply module 4 can convert the DC 1500V voltage into AC 380V to power the air-conditioning inverter; the fusion power supply module 4 can convert the DC 1500V voltage into AC 380V (i.e., the load low-voltage AC voltage) to power the AC load.

[0044] In some other embodiments, each vehicle is provided with at least two integrated power supply modules 4 , which are redundant to each other.

[0045] In some other embodiments, after the fusion power supply module 4 converts the low-voltage DC voltage into a low-voltage DC voltage, the low-voltage DC voltage is only output at the front of the vehicle; after the fusion power supply module 4 converts the low-voltage AC voltage into a load low-voltage AC voltage, the load low-voltage AC voltage is only output at the middle vehicle.

[0046] In some other embodiments, a battery is connected between the integrated power supply module 4 and the DC load input side.

[0047] The above is a detailed introduction to the embodiments of the present application. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method and core idea of ​​the present application.

[0048] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the invention is defined by the appended claims rather than the above description, and it is intended that all changes that fall within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference to the accompanying figures in the claims should not be regarded as limiting the claims involved. In addition, it is obvious that the word "comprising" does not exclude other units or steps, and the singular does not exclude the plural. Multiple units or devices stated in the system claim may also be implemented by one unit or device through software or hardware. The words first, second, etc. are used to indicate names and do not indicate any particular order.

[0049] At the same time, for those skilled in the art, according to the concept of this application, there may be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting this application.

Claims

DEPCT691. An auxiliary power supply system for dual-voltage trains comprising a pantograph, thrust transformer, thrust converter, and integrated power supply module, where the input side of the pantograph is connected to the grid and the output side is connected to the thrust transformer; the output side of the thrust transformer is connected to the thrust converter; the output side of the thrust converter is connected to the integrated power supply module, and the output side of the integrated power supply module is connected to the input side of the air conditioner, the input side of the DC load, and the input side of the AC load.

2. An auxiliary power supply system for dual-voltage trains according to claim 1, where the thrust transformer is designed to convert high AC voltage to low AC voltage.

3. An auxiliary power supply system for dual-voltage trains according to claim 2, where the thrust converter is designed to convert low AC voltage to high DC voltage. 4.Auxiliary power supply system for dual-voltage trains under claim 3, where integrated power supply modules are designed to convert high-voltage DC voltage to low-voltage AC voltage and low-voltage DC voltage.

5. Auxiliary power supply system for dual-voltage trains under claim 4, where low-voltage DC voltage is designed to power DC loads and low-voltage AC voltage is incorporated with voltages used to power air conditioning and voltages used to power AC loads.

6. Auxiliary power supply system for dual-voltage trains under claim 1, where the pantograph can accept 25 kV AC or 1500 V DC voltage. 7.

8. An auxiliary power supply system for dual-voltage trains under claim 4 where the high-level AC voltage is in the range of AC 22 kV to AC 29 kV, the medium-level AC voltage is in the range of AC 900 V to AC 1,200 V, the high-level DC voltage is in the range of DC 1,000 V to DC 1,950 V, the low-level AC voltage is in the range of AC 0 V to AC 380 V, and the low-level DC voltage is in the range of DC 0 V to DC 110 V.

9. An auxiliary power supply system for dual-voltage trains under claim 1 where each train is provided with at least two integrated power supply modules, and at least two such integrated power supply modules have redundant operation with each other.

10. The auxiliary power supply system for dual-voltage trains under claim 4, where after the integrated power supply module converts the high-level DC voltage to a low-level DC voltage, the low-level DC voltage is output only at the front of the train, and after the integrated power supply module converts the high-level DC voltage to a low-level AC voltage for the load, the low-level AC voltage for the load is output only at the middle of the train.

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