WO2020113602A1

WO2020113602A1 - Power car traction system supporting multiple power supply modes

Info

Publication number: WO2020113602A1
Application number: PCT/CN2018/120148
Authority: WO
Inventors: 徐萌; 哈大雷; 吕义; 陈天宇; 金文斌
Original assignee: 中车长春轨道客车股份有限公司
Priority date: 2018-12-05
Filing date: 2018-12-10
Publication date: 2020-06-11
Also published as: SG11201911894YA

Abstract

Provided in an embodiment of the present invention is a power car traction system supporting multiple power supply modes, comprising: an alternating current pantograph; a direct current pantograph; a disconnector; an alternating current high voltage compartment; a direct current high voltage compartment; a traction transformer; a traction auxiliary converter; and a traction motor. The alternating current high voltage compartment is connected to the alternating current pantograph. The disconnector is connected to the direct current pantograph. The direct current high voltage compartment is connected to the disconnector. The traction transformer is connected to the alternating current high voltage compartment and the direct current high voltage compartment. A primary side of the traction transformer is connected to a ground device. A current transformer is provided at each of the primary side and a grounding end of the traction transformer. The traction auxiliary converter has an input end connected to the traction transformer and an output end connected to the traction motor. The solution of the present invention can realize an alternating current power supply mode and a direct current power supply mode, thereby enhancing applicability of a power car. Moreover, a secondary side winding of the traction transformer can serve as a smoothing reactor, thereby reducing the space occupied by a circuit, and increasing economic benefits.

Description

Multi-standard power supply traction system

This application requires submission to the China Patent Office on December 5, 2018, the application number is 201811482748.4, the invention name is "a multi-standard power supply traction system" and the application number is 201822038028.0, the utility model name is "a multi-standard power supply The priority of the domestic application of "Motor Vehicle Traction System", the entire content of which is incorporated by reference in this application.

Technical field

The invention relates to the technical field of electric vehicles, and in particular to a multi-standard electric vehicle traction system.

Background technique

At present, the traction system of the EMU has only one power supply system. For example, a 25kV power supply system is adopted, and the voltage conversion is performed through the traction transformer on the EMU, and then the converted voltage is input to the traction converter, after rectification, inverter, and output To the traction motor, and then realize the power supply for the traction motor.

However, with the rapid development of EMUs, a single power supply system limits the diversity of EMUs. Therefore, how to provide a multi-standard power supply EMU traction system to improve the diversity of EMUs is urgently needed by those skilled in the art. A major technical problem.

Summary of the invention

In view of this, the embodiments of the present invention provide a multi-standard power supply traction system for an electric vehicle, which can improve the diversity of the EMU.

To achieve the above objectives, the embodiments of the present invention provide the following technical solutions:

A multi-system powered traction system for electric vehicles, including: AC pantograph, DC pantograph, isolation switch, AC high voltage tank, DC high voltage tank, traction transformer, traction auxiliary converter and traction motor,

The AC high-voltage tank is connected to the AC pantograph to detect whether the first voltage and the first current flowing through the AC pantograph are AC power supply parameters. If not, disconnect the AC high-voltage tank from the The AC pantograph;

The isolation switch is connected to the DC pantograph to determine whether the voltage system on the DC pantograph is a non-DC system, and if so, disconnect the isolation switch from the DC pantograph;

The DC high-voltage box is connected to the isolation switch to detect whether the second voltage flowing through the isolation switch and the second current are DC power supply parameters, and if not, disconnect the DC high-voltage box from the isolation switch ;

The traction transformer is connected to the AC high-voltage tank and the DC high-voltage tank, the primary side of the traction transformer is connected to the grounding device, and the primary side and grounding end of the traction transformer are provided with current transformers;

The input end of the traction auxiliary converter is connected to the traction transformer, and the output end is connected to the traction motor.

Optionally, the isolation switch includes: an overcurrent detection device and an overcurrent protection device,

The overcurrent detection device is connected to the DC pantograph to detect whether the first current on the DC pantograph is higher than a first current threshold, and if so, send an alarm message;

The overcurrent protection device is connected to the overcurrent detection device, and is used to disconnect the overcurrent protection device and the overcurrent detection device based on the alarm information.

Optionally, it also includes: an alarm device,

The alarm device is connected to the isolation switch and issues an alarm based on the alarm information.

Optionally, the DC high voltage box includes: a DC voltage sensor, a DC current sensor, and a DC circuit breaker,

The DC voltage sensor is connected to the isolation switch, and is used to detect whether the second voltage flowing through the isolation switch meets the DC voltage requirements, and if not, send a DC voltage warning signal;

The DC current sensor is connected to the isolation switch and the DC voltage sensor, and is used to detect whether the second current flowing through the isolation switch meets the DC current requirement, and if not, send a DC current warning signal;

The DC circuit breaker is connected to the DC current sensor, and is used to disconnect the DC high-voltage tank and the isolation switch based on the DC voltage early warning signal and/or the DC current early warning signal.

Optionally, the AC high-voltage box includes: an AC voltage transformer, an AC current transformer, and an AC circuit breaker,

The AC voltage transformer is connected to the AC pantograph to detect whether the first voltage flowing through the AC pantograph meets the AC voltage requirements, and if not, to send an AC voltage warning signal;

The AC current transformer is connected to the AC pantograph and the AC voltage transformer, and is used to detect whether the first current flowing through the AC pantograph meets the AC current requirement, if not, send AC current warning signal;

The AC circuit breaker is connected to the AC current transformer and used to disconnect the AC high-voltage tank and the AC pantograph based on the AC voltage early warning signal and/or the AC current early warning signal.

Optionally, the overcurrent protection device includes a DC surge arrester.

Optionally, it also includes: a reminder device,

The reminder device is connected to the isolation switch, and sends a reminder signal based on the type of the alarm information.

Optionally, the AC pantograph is an AC 25KV pantograph, and the DC pantograph is a DC 750V pantograph, a DC 1.5KV pantograph or a DC 3KV pantograph.

Based on the above technical solution, an embodiment of the present invention provides a multi-standard power supply traction system for electric vehicles, including: AC pantograph, DC pantograph, disconnector, AC high voltage box, DC high voltage box, traction transformer, traction auxiliary transformer Flow controller and traction motor. Wherein, the AC high-voltage tank is connected to the AC pantograph to detect whether the first voltage and the first current flowing through the AC pantograph are AC power supply parameters, and if not, disconnect the AC high-voltage The box and the AC pantograph. The isolating switch is connected to the DC pantograph to determine whether the voltage system on the DC pantograph is a non-DC system, and if so, disconnect the isolating switch from the DC pantograph. The DC high-voltage box is connected to the isolation switch to detect whether the second voltage flowing through the isolation switch and the second current are DC power supply parameters, and if not, disconnect the DC high-voltage box from the isolation switch . The traction transformer is connected to the AC high-voltage tank and the DC high-voltage tank, the primary side of the traction transformer is connected to a grounding device, and the primary side and grounding end of the traction transformer are provided with current transformers. The input end of the traction auxiliary converter is connected to the traction transformer, and the output end is connected to the traction motor. It can be seen that the scheme provides a multi-standard power supply traction system for EMUs to increase the diversity of EMUs. In addition to this, the secondary winding of the traction transformer can also be used as smoothing reactance, which saves circuit space and improves economic performance.

BRIEF DESCRIPTION

In order to more clearly explain the embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings used in the embodiments or the description of the prior art. Obviously, the drawings in the following description are only This is an embodiment of the present invention. For a person of ordinary skill in the art, without paying any creative labor, other drawings may be obtained according to the provided drawings.

1 is a schematic structural diagram of a multi-standard power supply traction system provided by an embodiment of the present invention;

2 is a schematic diagram of a specific implementation structure of an isolating switch provided in this embodiment;

3 is a schematic diagram of a specific implementation structure of a DC high-voltage tank provided in this embodiment;

4 is a schematic diagram of a specific implementation structure of an AC high-voltage tank provided in this embodiment;

FIG. 5 is a schematic structural diagram of a multi-standard power supply traction system provided by this embodiment;

FIG. 6 is another schematic structural diagram of a multi-standard power supply traction system provided by this embodiment;

FIG. 7 is a specific circuit diagram of a multi-standard power supply traction system for an electric vehicle provided by this embodiment.

detailed description

The inventor found that the current EMU traction system only has one power supply system. For example, a 25 kV power supply system is adopted to perform voltage conversion through the traction transformer on the EMU, and then input the converted voltage into the traction converter, after rectification, Inverter, output to traction motor, and then realize power supply for traction motor.

However, with the rapid development of EMUs, a single power supply system limits the diversity of EMUs, and the power supply network with multiple power supply systems cannot meet the needs of transportation across power supply systems.

Based on this, this embodiment provides a multi-system powered traction system for electric vehicles. Please refer to FIG. 1, which is a schematic structural diagram of a multi-system powered traction system for electric vehicles provided by an embodiment of the present invention. The multi-system powered traction system includes: AC pantograph 11, DC pantograph 12, isolating switch 13, AC high voltage box 14, DC high voltage box 15, traction transformer 16, traction auxiliary converter 17 and traction motor 18 .

Wherein, the AC high-voltage tank is connected to the AC pantograph to detect whether the first voltage and the first current flowing through the AC pantograph are AC power supply parameters; if not, disconnect the AC high-voltage The box and the AC pantograph.

The isolating switch is connected to the DC pantograph to determine whether the voltage system on the DC pantograph is a non-DC system, and if so, disconnect the isolating switch from the DC pantograph.

The DC high-voltage box is connected to the isolation switch to detect whether the second voltage flowing through the isolation switch and the second current are DC power supply parameters, and if not, disconnect the DC high-voltage box from the isolation switch .

The traction transformer is connected to the AC high-voltage tank and the DC high-voltage tank, the primary side of the traction transformer is connected to a grounding device, and the primary side and grounding end of the traction transformer are provided with current transformers.

Specifically, the pantograph is an electrical device that obtains electrical energy from the power supply contact network for electric traction locomotives including high-speed rail and electric trains, and is usually installed on the roof of the locomotive or the electric train. The pantograph can be divided into two types: single arm bow and double arm bow, which are composed of skateboard, upper frame, lower arm rod (lower frame for double arm bow), underframe, bow spring, transmission cylinder, supporting insulator and other components.

Among them, the DC pantograph is used to obtain DC power supply from the power supply contact network. The AC pantograph is used to obtain AC power supply from the power supply contact network. In this embodiment, the AC pantograph and the DC pantograph are provided at the same time, so that the traction system of the electric vehicle can provide multi-standard power supply.

It should be noted that, in this embodiment, the AC pantograph and the DC pantograph can be set in tandem, or on the same horizontal line, which is not specifically limited here, and can be set arbitrarily according to the actual situation.

Wherein, the AC pantograph may be an AC 25KV pantograph, and the DC pantograph may be a DC 750V pantograph, a DC 1.5KV pantograph or a DC 3KV pantograph. Specifically, in the AC system, the power supply of 25KV AC is generally used. In the DC system, a 750V DC pantograph, a 1.5KV DC pantograph, a 3KV DC pantograph, and an AC 25KV pantograph are generally used. Among them, different voltages represent that the pantograph can withstand the corresponding power supply voltage for a long time.

The isolating switch is connected to the DC pantograph, used to judge whether the power supply of the non-DC system is flowing, and when the judgment result is yes, disconnect the connection to the DC pantograph.

As shown in FIG. 2, a specific implementation structure of an isolation switch is provided in this embodiment. The isolation switch includes: an overcurrent detection device 21 and an overcurrent protection device 22.

Wherein, the overcurrent detection device is connected to the DC pantograph, and is used to detect whether the first current on the DC pantograph is higher than a first current threshold, and if so, send an alarm message.

Illustratively, the overcurrent detection device is connected to the DC pantograph, and is used to detect whether the flowing current exceeds a preset range, and if it exceeds, a overcurrent alarm signal is sent. The over-current protection device is connected to the over-current detection device, and is used to disconnect the over-current detection device after receiving the over-current alarm signal.

The isolation switch including the overcurrent detection device and the overcurrent protection device is connected to the DC pantograph, and the overcurrent detection device is used to determine whether the current from the DC pantograph exceeds the current range provided by the original DC power supply. And when it detects that the current flowing through it exceeds the preset range of the current, an overcurrent alarm signal is issued to use the overcurrent protection device to automatically disconnect the overcurrent detection device when receiving the overcurrent alarm signal .

When the AC power supply is introduced into the DC pantograph, the AC power supply current is much larger than the DC power supply current. Therefore, it can be judged whether the power supply is wrong by performing an overcurrent detection. Specifically, there are various components that can assume the overcurrent detection function, and the most suitable component can be flexibly selected. Overcurrent protection devices can use similar components such as DC surge arresters.

The DC high-voltage box is connected to the isolating switch to detect whether the voltage and current flowing through meet the requirements of the DC power supply, and disconnect the connection to the isolating switch when it does not meet the requirements of the DC power supply.

The AC high-voltage box is connected to the AC pantograph to detect whether the flowing voltage and current meet the AC power supply requirements, and disconnect the AC pantograph when it does not meet the AC power supply requirements.

Among them, the main function of the DC high-voltage box and the AC high-voltage box is to detect whether the voltage and current flowing through it meet the power supply requirements of the corresponding standards, and disconnect the connection to the upper layer when the power supply requirements are not met. Non-compliance means that the transmitted power is abnormal. There may be many reasons for the abnormality, such as a component failure in the middle, abnormal upper power supply, etc., because the power supply that does not meet the requirements may not be able to pass the subsequent processing steps normally, and finally be driven The traction of the train forward.

As shown in FIG. 3, this embodiment provides a specific implementation structure of a DC high-voltage tank. The DC high-voltage tank includes a DC voltage sensor 31, a DC current sensor 32, and a DC circuit breaker 33.

Wherein, the DC voltage sensor is connected to the isolating switch, and is used to detect whether the second voltage flowing through the isolating switch meets the DC voltage requirement, and if not, send a DC voltage warning signal;

Correspondingly, the components contained in the corresponding AC high-voltage box under the AC standard power supply are similar to those in the DC high-voltage box, and only need to replace the components with the AC standard. As shown in FIG. 4, the AC high-voltage tank includes an AC voltage transformer 41, an AC current transformer 42 and an AC circuit breaker 43.

Wherein, the AC voltage transformer is connected to the AC pantograph to detect whether the first voltage flowing through the AC pantograph meets the AC voltage requirements, and if not, to send an AC voltage warning signal;

The traction transformer is connected to the AC voltage box, and the primary side of the traction converter is returned to the substation from the steel rail through the grounding device, which is used to reduce the power supply voltage of the AC system transmitted. Current transformers are provided on the primary side and grounding end of the traction transformer for differential protection of the traction transformer.

In the DC mode, the traction winding of the traction transformer is used as the smoothing reactance, which effectively reduces the weight of the locomotive and saves the space for equipment layout. It is realized by the multi-level transfer switch inside the converter.

The input end of the traction auxiliary converter is connected to the traction transformer, and the output end is connected to the traction motor, which is used for auxiliary conversion processing of the power supply transmitted by the traction transformer to obtain the traction voltage used by the traction motor.

Traction motor, used to convert traction voltage into corresponding traction force.

It can be seen that the scheme provides a multi-standard power supply traction system for EMUs to increase the diversity of EMUs. In addition to this, the secondary winding of the traction transformer can also be used as smoothing reactance, which saves circuit space and improves economic performance.

On the basis of the above-mentioned embodiment, as shown in FIG. 5, this embodiment provides a multi-standard powered electric vehicle traction system, which further includes: an alarm device 51.

Wherein, the alarm device is connected to the isolating switch and issues an alarm based on the alarm information.

That is, the overcurrent alarm signal can be transmitted to the train driver's cab, so that the train driver can change the power supply system in time after receiving the overcurrent alarm signal, and change the wrong power supply system from the source in time, so that the DC pantograph does not Withstand the high-voltage power supply of AC system for a long time, which can increase the service life of components.

On the basis of the above-mentioned embodiment, as shown in FIG. 6, this embodiment provides a multi-standard power supply electric vehicle traction system, further comprising: a reminder device 61.

Wherein, the reminder device is connected to the isolation switch, and sends a reminder signal based on the type of the alarm information.

That is, the reminder device sends different reminder signals according to the type of the received warning signal, which is more convenient for the driver to judge and avoid distracted driving errors.

Specifically, as shown in FIG. 7, this embodiment provides a specific circuit diagram of a multi-standard powered electric vehicle traction system.

To sum up, the embodiments of the present invention provide a multi-system powered traction system for electric vehicles, including: AC pantograph, DC pantograph, disconnector, AC high voltage box, DC high voltage box, traction transformer, traction auxiliary converter And traction motor. Wherein, the AC high-voltage tank is connected to the AC pantograph to detect whether the first voltage and the first current flowing through the AC pantograph are AC power supply parameters, and if not, disconnect the AC high-voltage The box and the AC pantograph. The isolating switch is connected to the DC pantograph to determine whether the voltage system on the DC pantograph is a non-DC system, and if so, disconnect the isolating switch from the DC pantograph. The DC high-voltage box is connected to the isolation switch to detect whether the second voltage flowing through the isolation switch and the second current are DC power supply parameters, and if not, disconnect the DC high-voltage box from the isolation switch . The traction transformer is connected to the AC high-voltage tank and the DC high-voltage tank, the primary side of the traction transformer is connected to a grounding device, and the primary side and grounding end of the traction transformer are provided with current transformers. The input end of the traction auxiliary converter is connected to the traction transformer, and the output end is connected to the traction motor. It can be seen that the scheme provides a multi-standard power supply traction system for EMUs to increase the diversity of EMUs. In addition to this, the secondary winding of the traction transformer can also be used as smoothing reactance, which saves circuit space and improves economic performance.

The embodiments in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts between the embodiments may refer to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant part can be referred to the description in the method part.

Professionals can further realize that the units and algorithm steps of the examples described in conjunction with the embodiments disclosed herein can be implemented by electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the hardware and software Interchangeability, in the above description, the composition and steps of each example have been generally described according to function. Whether these functions are performed in hardware or software depends on the specific application of the technical solution and design constraints. Professional technicians can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the present invention.

The steps of the method or algorithm described in conjunction with the embodiments disclosed herein may be implemented directly by hardware, a software module executed by a processor, or a combination of both. Software modules can be placed in random access memory (RAM), memory, read-only memory (ROM), electrically programmable ROM, electrically erasable and programmable ROM, registers, hard disks, removable disks, CD-ROMs, or all fields of technology. Any other known storage medium.

The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown in this document, but should conform to the widest scope consistent with the principles and novel features disclosed in this document.

Claims

A multi-system powered traction system for electric vehicles, which is characterized by comprising: an AC pantograph, a DC pantograph, an isolating switch, an AC high voltage box, a DC high voltage box, a traction transformer, a traction auxiliary converter and a traction motor,

The AC high-voltage tank is connected to the AC pantograph to detect whether the first voltage and the first current flowing through the AC pantograph are AC power supply parameters. If not, disconnect the AC high-voltage tank from the The AC pantograph;

The disconnect switch is connected to the DC pantograph to determine whether the voltage standard on the DC pantograph is a non-DC standard, and if so, disconnect the disconnect switch from the DC pantograph;

The DC high-voltage box is connected to the isolation switch to detect whether the second voltage flowing through the isolation switch and the second current are DC power supply parameters, and if not, disconnect the DC high-voltage box from the isolation switch ;

The traction transformer is connected to the AC high-voltage tank and the DC high-voltage tank, the primary side of the traction transformer is connected to the grounding device, and the primary side and grounding end of the traction transformer are provided with current transformers;

The input end of the traction auxiliary converter is connected to the traction transformer, and the output end is connected to the traction motor.
The multi-system powered electric vehicle traction system according to claim 1, wherein the isolating switch includes: an overcurrent detection device and an overcurrent protection device,

The overcurrent detection device is connected to the DC pantograph to detect whether the first current on the DC pantograph is higher than a first current threshold, and if so, send an alarm message;

The overcurrent protection device is connected to the overcurrent detection device, and is used to disconnect the overcurrent protection device and the overcurrent detection device based on the alarm information.
The multi-system powered electric vehicle traction system according to claim 2, further comprising: an alarm device,

The alarm device is connected to the isolation switch and issues an alarm based on the alarm information.
The multi-system powered electric vehicle traction system according to claim 1, wherein the DC high voltage tank includes: a DC voltage sensor, a DC current sensor and a DC circuit breaker,

The DC voltage sensor is connected to the isolation switch, and is used to detect whether the second voltage flowing through the isolation switch meets the DC voltage requirements, and if not, send a DC voltage warning signal;

The DC current sensor is connected to the isolation switch and the DC voltage sensor, and is used to detect whether the second current flowing through the isolation switch meets the DC current requirement, and if not, send a DC current warning signal;

The DC circuit breaker is connected to the DC current sensor, and is used to disconnect the DC high-voltage tank and the isolation switch based on the DC voltage early warning signal and/or the DC current early warning signal.
The multi-system powered electric vehicle traction system according to claim 1, wherein the AC high-voltage tank includes: an AC voltage transformer, an AC current transformer, and an AC circuit breaker,

The AC voltage transformer is connected to the AC pantograph to detect whether the first voltage flowing through the AC pantograph meets the AC voltage requirements, and if not, to send an AC voltage warning signal;

The AC current transformer is connected to the AC pantograph and the AC voltage transformer, and is used to detect whether the first current flowing through the AC pantograph meets the AC current requirement, if not, send AC current warning signal;

The AC circuit breaker is connected to the AC current transformer and used to disconnect the AC high-voltage tank and the AC pantograph based on the AC voltage early warning signal and/or the AC current early warning signal.
The multi-system powered electric vehicle traction system according to claim 2, wherein the overcurrent protection device includes a DC surge arrester.
The multi-system powered electric vehicle traction system according to claim 2, further comprising: a reminder device,

The reminder device is connected to the isolation switch, and sends a reminder signal based on the type of the alarm information.
The multi-system powered traction system according to claim 1, wherein the AC pantograph is an AC 25KV pantograph, the DC pantograph is a DC 750V pantograph, and a DC 1.5KV pantograph Bow or DC 3KV pantograph.