Dual source locomotive and auxiliary through compressor control circuit and method therefor

Abstract

The application discloses a double-source locomotive and an auxiliary through-compressor control circuit and method thereof. The double-source locomotive auxiliary through-compressor circuit comprises a power section and a power pack section. The power section is connected with a first compressor through the contact of an auxiliary inverter, an auxiliary transformer and a first contactor in sequence. The power pack section is connected with a second compressor through a DC-AC converter, an AC-DC converter, a compressor inverter and the contact of a fourth contactor in sequence. The input side of the first compressor and the input side of the second compressor are connected through an auxiliary through-line. In different power supply modes, the on-off of each contactor is controlled, so that the first compressor and the second compressor are started in the corresponding mode. The application can meet the power supply demand in different modes, ensure the normal work of the compressor, improve the power supply reliability and ensure the normal work of the compressor. In different modes, the reliable power supply configuration and the reliable work of the compressor can be realized.

Description

Technical Field

[0001] This invention relates to the field of power supply control technology for rail transit, and in particular to a dual-source locomotive and its auxiliary through-compressor control circuit and method. Background Technology

[0002] The dual-source locomotive is a new type of locomotive composed of an electric motor section and a power pack section (with energy storage devices such as diesel engines or batteries) connected in multiple units. The electric motor section provides traction power to the electric locomotive via an AC25 pantograph through the grid, and simultaneously provides power to the electric locomotive's auxiliary circuits. The power pack section's traction system is powered by its onboard diesel generator set or traction batteries.

[0003] With changing application requirements, dual-source locomotives can operate in three modes depending on the application scenario: single power supply mode, single power pack power supply mode, and simultaneous dual-source power supply mode. In all three modes, the compressors of both the electric locomotive and the power pack auxiliary system need to start simultaneously. In the electric power supply mode, the power pack compressor needs to operate, and in the power pack power supply mode, the electric locomotive compressor needs to operate. Therefore, the auxiliary power supplies of the compressors in both locomotives need to be connected. However, considering the different power supply capabilities of the electric mode and the power pack auxiliary system, the compressor starting methods also differ. How to control the compressor starting method according to the different power supply capabilities of the electric mode and the power pack auxiliary system to ensure reliable power supply and compressor operation of the dual-source locomotive is an urgent problem to be solved. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a dual-source locomotive and its auxiliary through-compressor control circuit and method to address the shortcomings of the prior art. The starting mode of the compressor is controlled according to the power supply capacity of the dual-source locomotive power supply to ensure power supply reliability and at the same time ensure the normal operation of the compressor.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a dual-source locomotive auxiliary through-compressor circuit, comprising a power section and a power pack section, wherein the power section is connected to the first compressor in sequence through an auxiliary inverter, an auxiliary transformer, and the contacts of a first contactor; the power pack section is connected to the second compressor in sequence through a DC-AC converter, an AC-DC converter, a compressor inverter, and the contacts of a fourth contactor; characterized in that the input side of the first compressor and the input side of the second compressor are connected through an auxiliary through-line;

[0006] Under different power supply modes, the on / off state of each contactor is controlled to start the first compressor and the second compressor in the corresponding mode.

[0007] The power supply modes include a single power supply mode, a single power pack power supply mode, and a dual-source simultaneous power supply mode;

[0008] In both the standalone power supply mode and the standalone power pack power supply mode, the first compressor and the second compressor start in the same way;

[0009] In the dual-source simultaneous power supply mode, the first compressor and the second compressor start up in different ways.

[0010] This invention enables two compressors to start in corresponding modes by controlling the on and off states of the contactor under different on / off modes, ensuring reliable power supply and normal operation of the compressors. This improves both power supply reliability and passenger comfort.

[0011] Preferably, in the present invention, under the separate power supply mode, both the first compressor and the second compressor adopt a forced start mode; the forced start mode means that the power supply provides full-frequency power to the first compressor and the second compressor, and the first compressor and the second compressor operate at the rated operating frequency.

[0012] In this invention, the forced start method means that the compressor does not need to consider the limitations of power supply when starting up, and the compressor starts working at the rated operating frequency after starting.

[0013] Preferably, in the present invention, in the separate power supply mode, both the first compressor and the second compressor adopt a soft start method; the soft start method means that the power frequency supplied to the first compressor and the second compressor gradually increases from 0Hz to full frequency. Initially, the operating frequency of the first compressor and the second compressor is lower than the rated operating frequency. When the power frequency gradually increases to full frequency, the first compressor and the second compressor operate at the rated operating frequency.

[0014] Preferably, in this invention, the auxiliary through-line includes a third contactor contact, one end of which is connected between the first contactor contact and the first compressor, and the other end of which is connected between the fourth contactor contact and the second compressor, and the other end of the third contactor contact is connected to one end of the second contactor contact; the other end of the second contactor contact is connected between the auxiliary transformer and the first contactor contact.

[0015] Preferably, in the present invention, in the standalone power supply mode, the contacts of the first contactor and the second contactor are both closed, while the contacts of the third contactor and the fourth contactor are both open.

[0016] Preferably, in the present invention, in the standalone power pack power supply mode, the contacts of the third contactor and the fourth contactor are both closed, while the contacts of the first contactor and the second contactor are both open.

[0017] In the dual-source simultaneous power supply mode, the contacts of the first contactor and the fourth contactor are closed, while the contacts of the second contactor and the third contactor are open.

[0018] As an inventive concept, the present invention also provides a dual-source locomotive, which employs the auxiliary through-compressor circuit described above.

[0019] As an inventive concept, the present invention also provides a control method for a dual-source locomotive auxiliary through-type compressor, comprising a first compressor and a second compressor; the method includes:

[0020] When the dual-source locomotive is operating in independent power supply mode, both the first and second compressors adopt forced start mode;

[0021] When the dual-source locomotive is operating in the independent power pack power supply mode, both the first compressor and the second compressor adopt soft start mode;

[0022] When the dual-source locomotive is operating in the dual-source simultaneous power supply mode, the first compressor adopts the forced start method and the second compressor adopts the soft start method.

[0023] The forced start method refers to the power switch providing full-frequency power to the first compressor and the second compressor, and the first compressor and the second compressor operating at their rated operating frequencies.

[0024] The soft start method refers to the following: the power frequency supplied to the first compressor and the second compressor gradually increases from 0Hz to full frequency. Initially, the operating frequency of the first compressor and the second compressor is lower than the rated operating frequency. After the power frequency gradually increases to full frequency, the first compressor and the second compressor operate at the rated operating frequency.

[0025] In this invention, the power supply frequency increases from 0Hz to full frequency in steps of 1Hz / cycle. Setting the step size to 1Hz / cycle allows for precise adjustment of the compressor's operating frequency, enabling it to reach full frequency quickly without drastically increasing the power load.

[0026] Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention can meet the power supply requirements under different modes, while ensuring the normal operation of the compressor, improving the reliability of power supply, and ensuring the normal operation of the compressor; reliable power supply configuration and reliable operation of the compressor can be achieved in different modes. Attached Figure Description

[0027] Figure 1 This is a circuit diagram of the dual-source locomotive auxiliary through circuit according to an embodiment of the present invention.

[0028] Figure 2This is a diagram showing the power supply mode for two compressors in a separate power supply mode according to an embodiment of the present invention.

[0029] Figure 3 This is a power supply diagram for two compressors in the standalone power pack mode of this invention.

[0030] Figure 4 This is a diagram showing the power supply of two compressors in a dual-source simultaneous power supply mode according to an embodiment of the present invention. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] In this embodiment of the invention, the required power supply mode is selected from three working modes according to the application scenario. The three modes are single power supply mode, single power pack power supply mode, and dual-source simultaneous power supply mode.

[0033] In one implementation, under stand-alone power supply mode, the power supply section (overhead contact network) supplies power to compressor 1 (first compressor) of the power supply section via an auxiliary inverter and an auxiliary transformer. Then, contactor 1 (first contactor) is closed to provide power, and contactor 2 (second contactor) is closed to supply power to compressor 2 (second compressor) of the power package section via an auxiliary through-line. See the circuit diagram for details. Figure 2 .

[0034] In this mode, the two compressors are controlled as follows: Compressor 1 and Compressor 2 are started in a forced start mode, that is, the power supply after the power section passes through the auxiliary inverter and auxiliary transformer is directly used as the full-frequency power supply for the compressor to work, and the two compressors on the two locomotives work under full-frequency conditions.

[0035] In one implementation, under the standalone power pack power supply mode, the power pack (internal combustion engine, traction battery, or other energy storage device, etc.) supplies power to compressor 2 via a DC / AC module, an AC / DC module, and a compressor inverter, then closes contactor 4 (the fourth contactor). After passing through the compressor auxiliary through-line, contactor 3 (the third contactor) closes again to supply power to compressor 1. The circuit diagram is shown below. Figure 3 .

[0036] In this mode, the two compressors are controlled as follows: Compressor 1 and Compressor 2 start in a soft-start mode. That is, the power supply frequency of the AC / DC module and the compressor inverter gradually increases from 0Hz (with an increase step of 1Hz / cycle) to the full frequency (i.e., the rated operating frequency). During the increase, the compressor reaches its lowest frequency. At the initial moment (i.e., when the power supply frequency is 0Hz), the compressor operates at a reduced frequency. As the auxiliary power supply frequency gradually increases to the full frequency, the compressor can operate at full frequency.

[0037] In this embodiment of the invention, frequency reduction operation means that because the power supply does not reach the compressor's rated frequency, the compressor can only operate at a frequency lower than the rated frequency.

[0038] In one implementation, under dual-source simultaneous power supply mode, the power unit, after passing through an auxiliary inverter and an auxiliary transformer, provides power to compressor 1 of the power unit via contactor 1. The power unit, after passing through a DC / AC module, an AC / DC module, and a compressor inverter, provides power to compressor 2 via contactor 4. The circuit diagram is shown below. Figure 4 .

[0039] In this mode, the two compressors are controlled as follows: Compressor 1 starts using a forced start method, where the power supply is directly supplied to compressor 1 at full frequency after passing through the auxiliary inverter and auxiliary transformer; Compressor 2 starts using a soft start method, where the power supply frequency of the power package passes through the DC / AC module, and the AC / DC module and compressor inverter gradually increases from 0Hz to full frequency. During the increase, the compressor reaches its lowest frequency and operates at reduced frequency. As the auxiliary power supply frequency gradually increases to full frequency, the compressor can operate at full frequency.

[0040] Although preferred embodiments of this application have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this application.

[0041] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.

Claims

1. A dual source locomotive auxiliary through compressor circuit comprising a power section and a power pack section, the power section connecting a first compressor through a contact of a first contactor, in sequence, through an auxiliary inverter, an auxiliary transformer; the power pack section connecting a second compressor through a contact of a fourth contactor, in sequence, through a DC-AC converter, an AC-DC converter, a compressor inverter; characterized in that, The input side of the first compressor and the input side of the second compressor are connected through an auxiliary through line; In different power supply modes, the on-off of each contactor is controlled to enable the first compressor and the second compressor to start in the corresponding mode; The power supply mode includes a single power supply mode, a single power pack supply mode and a dual-source simultaneous supply mode; In the single power supply mode and the single power pack supply mode, the starting modes of the first compressor and the second compressor are the same; In the dual-source simultaneous supply mode, the starting modes of the first compressor and the second compressor are different; When the dual-source locomotive works in the dual-source simultaneous supply mode, the first compressor adopts a strong starting mode, and the second compressor adopts a soft starting mode; The strong starting mode refers to that the power section provides full-frequency power for the first compressor and the second compressor, and the first compressor and the second compressor work at a rated working frequency; The soft starting mode refers to that the power frequency supplied to the first compressor and the second compressor gradually rises from 0Hz to full frequency, and at the initial moment, the working frequency of the first compressor and the second compressor is lower than the rated working frequency, and when the power frequency gradually rises to full frequency, the first compressor and the second compressor work at the rated working frequency.

2. The dual-source locomotive auxiliary cross compressor circuit of claim 1, wherein, In the single power supply mode, the first compressor and the second compressor both adopt the strong starting mode.

3. The dual-source locomotive auxiliary cross compressor circuit of claim 1, wherein, In the single power pack supply mode, the first compressor and the second compressor both adopt the soft starting mode.

4. The dual-source locomotive auxiliary cross compressor circuit of one of claims 1-3, wherein, The auxiliary through line includes a third contactor contact point, one end of the third contactor contact point is connected between the first contactor contact point and the first compressor, the other end of the third contactor contact point is connected between the fourth contactor contact point and the second compressor, and the other end of the third contactor contact point is connected to one end of the second contactor contact point; The other end of the second contactor contact point is connected between the auxiliary transformer and the first contactor contact point.

5. The dual-source locomotive auxiliary cross compressor circuit of claim 4, wherein, In the single power supply mode, the contacts of the first contactor and the contacts of the second contactor are closed, and the contacts of the third contactor and the contacts of the fourth contactor are open.

6. The dual-source locomotive auxiliary cross compressor circuit of claim 4, wherein, In the single power pack supply mode, the contacts of the third contactor and the contacts of the fourth contactor are closed, and the contacts of the first contactor and the contacts of the second contactor are open.

7. The dual-source locomotive auxiliary cross compressor circuit of claim 4, wherein, In the dual-source simultaneous supply mode, the contacts of the first contactor and the contacts of the fourth contactor are closed, and the contacts of the second contactor and the contacts of the third contactor are open.

8. A dual-source locomotive characterized by, It adopts the auxiliary through compressor circuit of any one of claims 1-7.

9. A dual-source locomotive auxiliary cross compressor control method, comprising a first compressor and a second compressor; characterized in that, The method comprises: When the dual-source locomotive works in the single power supply mode, the first compressor and the second compressor both adopt the strong starting mode; When the dual-source locomotive works in the single power pack supply mode, the first compressor and the second compressor both adopt the soft starting mode; When the dual-source locomotive works in the dual-source simultaneous supply mode, the first compressor adopts the strong starting mode, and the second compressor adopts the soft starting mode; The strong starting mode refers to that the power section provides full-frequency power for the first compressor and the second compressor, and the first compressor and the second compressor work at a rated working frequency; The soft start mode refers to that the power frequency supplied to the first compressor and the second compressor is gradually increased from 0 Hz to full frequency, at an initial moment, the working frequency of the first compressor and the second compressor is lower than the rated working frequency, and when the power frequency is gradually increased to full frequency, the first compressor and the second compressor work at the rated working frequency.

10. The dual-source locomotive auxiliary cross compressor control method of claim 9, wherein, The power frequency is increased from 0 Hz to full frequency at a step of 1 Hz per cycle.

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