WO2020113600A1 - Emergency self-propelled motor vehicle traction system - Google Patents

Abstract

An emergency self-propelled motor vehicle traction system, comprising a four-quadrant rectifier (11), a traction inverter (12), a traction electric motor (13), a high-frequency isolated bidirectional DC/DC converter (14), a bidirectional DC/DC converter (15), and a power battery (16); when an external alternating-current grid is in a normal power supply state, the four-quadrant rectifier (11) converts the alternating current of the external alternating-current grid into a first direct current, and the traction inverter (12) converts the first direct-current power into a target alternating-current, so that the target alternating current supplies power to the traction electric motor (13); moreover, the first direct current is converted into a second direct current by the high-frequency isolated bidirectional DC/DC converter (14), and the second direct current supplies power to the power battery (16) via the bidirectional DC/DC converter (15); and when the external alternating-current power grid is in a power-off state, the power battery (16) supplies electrical energy to the traction inverter (12) via the bidirectional DC/DC converter (15) and the high-frequency isolated bidirectional DC/DC converter (14) so as to supply power to the traction electric motor (13). The above-mentioned emergency self-propelled motor vehicle traction system can maintain the running of the motor vehicle traction system when a contact network is powered off.

Description

Emergency self-walking motor vehicle traction system

This application is required to be submitted to the China Patent Office on December 5, 2018, with the application number 201811482759.2, the invention name is "an emergency self-propelled electric vehicle traction system" and the application number 201822038030.8, and the utility model name is "an emergency self-propelled 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 motor vehicles, in particular to an emergency self-walking motor vehicle traction system.

Background technique

At present, the traction system of the EMU obtains electric energy from the contact grid through the pantograph to drive the traction motor. The inventor found that in the event of a contact network power failure, the current EMU traction system only maintains emergency lighting, ventilation and other functions through the battery, and cannot maintain the normal operation of the EMU traction system.

Therefore, how to provide an emergency self-walking EMU traction system that can maintain the walking of the EMU traction system when the contact network is powered off is a major technical problem to be solved urgently by those skilled in the art.

Summary of the invention

In view of this, the embodiments of the present invention provide an emergency self-walking traction system for electric vehicles, which can maintain the walking of the traction system of the EMU when the contact network is powered off.

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

An emergency self-propelled motor vehicle traction system, including: four-quadrant rectifier, traction inverter, traction motor, high-frequency isolated bidirectional DC/DC converter, bidirectional DC/DC converter and power battery,

The input end of the four-quadrant rectifier is electrically connected to an external AC power grid, and the output end of the four-quadrant rectifier is respectively connected to the input end of the traction inverter and the first end of the bidirectional DC/DC converter. The second end of the bidirectional DC/DC converter is connected to the power battery;

The output end of the traction inverter is connected to the traction motor;

When the external AC power grid is in a normal power supply state, the four-quadrant rectifier converts the AC power of the external AC power grid into first DC power, and the traction inverter converts the first DC power into target AC power, so that The target alternating current powers the traction motor; and the first direct current is transformed into a second direct current through the high-frequency isolated bidirectional DC/DC converter, and the second direct current passes through the bidirectional DC/DC converter To power the power battery;

When the external AC power grid is in a power-off state, the power battery supplies power to the traction inverter through the bidirectional DC/DC converter and the high-frequency isolated bidirectional DC/DC converter. Traction motor power supply.

Optional, also includes: auxiliary inverter and auxiliary load,

The input terminal of the auxiliary inverter is connected to the second terminal of the high-frequency isolated bidirectional DC/DC converter, and the auxiliary load is connected to the output terminal of the auxiliary inverter.

Optional, it also includes: DC/DC converter, DC load and battery,

The input terminal of the DC/DC converter is connected to the output terminal of the four-quadrant rectifier, and the output terminal of the DC/DC converter is connected to the DC load and the battery, respectively.

Optionally, the first DC power is 2700V-3850V, the target AC power is 2800V, the second DC power is 700V, the external AC power grid is AC 25kV, and the output voltage of the power battery is 650V DC.

Optionally, the output voltage of the auxiliary inverter is AC 380V.

Optionally, the output voltage of the battery is 110V DC.

Based on the above technical solution, an embodiment of the present invention provides an emergency self-propelled motor vehicle traction system, including: a four-quadrant rectifier, a traction inverter, a traction motor, a high-frequency isolated bidirectional DC/DC converter, and a bidirectional DC/DC converter Device and power battery. Wherein, the input end of the four-quadrant rectifier is electrically connected to an external AC power grid, and the output end of the four-quadrant rectifier is respectively connected to the input end of the traction inverter and the first end of the bidirectional DC/DC converter , The second end of the bidirectional DC/DC converter is connected to the power battery. The output end of the traction inverter is connected to the traction motor. When the external AC power grid is in a normal power supply state, the four-quadrant rectifier converts the AC power of the external AC power grid into first DC power, and the traction inverter converts the first DC power into target AC power, so that The target alternating current powers the traction motor; and the first direct current is transformed into a second direct current through the high-frequency isolated bidirectional DC/DC converter, and the second direct current passes through the bidirectional DC/DC converter To power the power battery. When the external AC power grid is in a power-off state, the power battery supplies power to the traction inverter through the bidirectional DC/DC converter and the high-frequency isolated bidirectional DC/DC converter. Traction motor power supply. That is, the emergency self-driving EMU traction system provided by the embodiment of the present invention can maintain the walking of the EMU traction system when the contact network is powered off.

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.

FIG. 1 is a schematic structural diagram of an emergency self-propelled motor vehicle traction system provided by an embodiment of the present invention;

2 is another schematic structural diagram of an emergency self-propelled motor vehicle traction system provided by an embodiment of the present invention;

3 is another schematic structural diagram of an emergency self-propelled motor vehicle traction system provided by an embodiment of the present invention;

FIG. 4 is a specific structural schematic diagram of an emergency self-propelled motor vehicle traction system provided by an embodiment of the present invention.

detailed description

Please refer to FIG. 1, which is a schematic structural diagram of an emergency self-propelled motor vehicle traction system according to an embodiment of the present invention. The motor vehicle traction system includes a four-quadrant rectifier 11, a traction inverter 12, a traction motor 13, a high-frequency isolated bidirectional DC/DC converter 14, a bidirectional DC/DC converter 15, and a power battery 16.

Wherein, the input end of the four-quadrant rectifier is electrically connected to an external AC power grid, and the output end of the four-quadrant rectifier is respectively connected to the input end of the traction inverter and the first end of the bidirectional DC/DC converter , The second end of the bidirectional DC/DC converter is connected to the power battery;

The output end of the traction inverter is connected to the traction motor.

When the external AC power grid is in a normal power supply state, the four-quadrant rectifier converts the AC power of the external AC power grid into first DC power, and the traction inverter converts the first DC power into target AC power, so that The target alternating current powers the traction motor; and the first direct current is transformed into a second direct current through the high-frequency isolated bidirectional DC/DC converter, and the second direct current passes through the bidirectional DC/DC converter To power the power battery;

When the external AC power grid is in a power-off state, the power battery supplies power to the traction inverter through the bidirectional DC/DC converter and the high-frequency isolated bidirectional DC/DC converter. Traction motor power supply.

That is, the emergency self-driving EMU traction system provided by the embodiment of the present invention can maintain the walking of the EMU traction system when the contact network is powered off.

It should be noted that in this implementation, the first DC power is 2700V-3850V, the target AC power is 2800V, the second DC power is 700V, the external AC power grid is AC 25kV, and the output of the power battery The voltage is 650V DC.

Based on the above embodiment, as shown in FIG. 2, the emergency self-propelled traction system provided by this embodiment further includes an auxiliary inverter 21 and an auxiliary load 22.

Wherein, the input end of the auxiliary inverter is connected to the second end of the high-frequency isolated bidirectional DC/DC converter, and the auxiliary load is connected to the output end of the auxiliary inverter. The output voltage of the auxiliary inverter may be AC 380V.

Based on the above embodiment, as shown in FIG. 3, the emergency self-propelled traction system provided by this embodiment further includes a DC/DC converter 31, a DC load 32, and a battery 33.

Wherein, the input end of the DC/DC converter is connected to the output end of the four-quadrant rectifier, and the output end of the DC/DC converter is connected to the DC load and the battery, respectively. The output voltage of the battery may be 110V DC.

Combining the above-mentioned embodiments, as shown in FIG. 4, FIG. 4 is a specific structural schematic diagram of a motor vehicle traction system provided by an embodiment of the present invention to respond to an emergency. The emergency self-propelled motor vehicle traction system provided by this embodiment can provide power to the traction motor and auxiliary equipment when the power is cut off. The bidirectional charger is connected to the high-frequency auxiliary DC/AC module and then to the intermediate DC link of the converter Connected to power the traction inverter and permanent magnet traction motor with higher efficiency.

It is worth mentioning that the use of high-frequency bidirectional auxiliary inverters can give full play to the advantages of soft switching and reduce system losses. In addition, the high-frequency auxiliary inverter is more efficient, and the permanent magnet traction motor is used. In the low-speed section, the efficiency of the traction system is higher, thereby saving energy.

In summary, an embodiment of the present invention provides an emergency self-propelled traction system for a motor vehicle, including: a four-quadrant rectifier, a traction inverter, a traction motor, a high-frequency isolated bidirectional DC/DC converter, a bidirectional DC/DC converter, and Power Battery. Wherein, the input end of the four-quadrant rectifier is electrically connected to an external AC power grid, and the output end of the four-quadrant rectifier is respectively connected to the input end of the traction inverter and the first end of the bidirectional DC/DC converter , The second end of the bidirectional DC/DC converter is connected to the power battery. The output end of the traction inverter is connected to the traction motor. When the external AC power grid is in a normal power supply state, the four-quadrant rectifier converts the AC power of the external AC power grid into first DC power, and the traction inverter converts the first DC power into target AC power, so that The target alternating current powers the traction motor; and the first direct current is transformed into a second direct current through the high-frequency isolated bidirectional DC/DC converter, and the second direct current passes through the bidirectional DC/DC converter To power the power battery. When the external AC power grid is in a power-off state, the power battery supplies power to the traction inverter through the bidirectional DC/DC converter and the high-frequency isolated bidirectional DC/DC converter. Traction motor power supply. That is, the emergency self-driving EMU traction system provided by the embodiment of the present invention can maintain the walking of the EMU traction system when the contact network is powered off.

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 executed 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 (6)

1. An emergency self-propelled motor vehicle traction system is characterized by comprising: a four-quadrant rectifier, a traction inverter, a traction motor, a high-frequency isolated bidirectional DC/DC converter, a bidirectional DC/DC converter, and a power battery,

   The input end of the four-quadrant rectifier is electrically connected to an external AC power grid, and the output end of the four-quadrant rectifier is respectively connected to the input end of the traction inverter and the first end of the bidirectional DC/DC converter. The second end of the bidirectional DC/DC converter is connected to the power battery;

   The output end of the traction inverter is connected to the traction motor;

   When the external AC power grid is in a normal power supply state, the four-quadrant rectifier converts the AC power of the external AC power grid into first DC power, and the traction inverter converts the first DC power into target AC power, so that The target alternating current powers the traction motor; and the first direct current is transformed into a second direct current through the high-frequency isolated bidirectional DC/DC converter, and the second direct current passes through the bidirectional DC/DC converter To power the power battery;

   When the external AC power grid is in a power-off state, the power battery supplies power to the traction inverter through the bidirectional DC/DC converter and the high-frequency isolated bidirectional DC/DC converter. Traction motor power supply.
2. The emergency self-propelled motor vehicle traction system according to claim 1, further comprising: an auxiliary inverter and an auxiliary load,

   The input terminal of the auxiliary inverter is connected to the second terminal of the high-frequency isolated bidirectional DC/DC converter, and the auxiliary load is connected to the output terminal of the auxiliary inverter.
3. The emergency self-propelled motor vehicle traction system according to claim 1, further comprising: a DC/DC converter, a DC load and a battery,

   The input terminal of the DC/DC converter is connected to the output terminal of the four-quadrant rectifier, and the output terminal of the DC/DC converter is connected to the DC load and the battery, respectively.
4. The emergency self-propelled motor vehicle traction system according to claim 1, characterized in that

   The first DC power is 2700V-3850V, the target AC power is 2800V, the second DC power is 700V, the external AC power grid is AC 25kV, and the output voltage of the power battery is 650V DC.
5. The emergency self-propelled motor vehicle traction system according to claim 2, wherein the output voltage of the auxiliary inverter is AC 380V.
6. The emergency self-propelled motor vehicle traction system of claim 3, wherein the output voltage of the battery is 110V DC.

Images