Self-checking test method for medium-voltage bus contactor of full-automatic unmanned train

Abstract

The application provides a self-checking test method for a medium-voltage bus contactor in a full-automatic unmanned train, which comprises a medium-voltage bus contactor self-checking test circuit. During the self-checking test of the medium-voltage bus contactor, the train network control system outputs a closing instruction and a disconnecting instruction in sequence after judging that the closing condition is met, controls the medium-voltage bus contactor to complete the closing and disconnecting actions, and simultaneously performs fault diagnosis according to the feedback state of the contactor. If the self-checking test of the medium-voltage bus contactor fails or the contactor fails, the train network control system will report the vehicle wake-up failure to the operation control center (OCC), the train cannot enter the main line in the unmanned mode, and the starting of the auxiliary inverter will not be performed, so that the reliability of the train and the availability of the auxiliary power supply system are ensured during the full-automatic unmanned operation.

Description

Technical Field

[0001] This invention relates to the field of rail train networks, and more particularly to train network control systems. Background Technology

[0002] The auxiliary power supply system is an important component of rail vehicles, providing power to the air conditioning, braking, various system control units, and ventilation equipment of the entire train. Grid-connected power supply is a widely adopted power supply method for auxiliary systems in recent years. Grid-connected power supply systems using multiple auxiliary inverters have strong redundancy and can greatly improve the stability and reliability of train operation.

[0003] In order to reduce the impact of the short circuit fault on the train and other medium-voltage loads when a medium-voltage busbar short circuit fault occurs in the grid-connected power supply system, the train is equipped with a medium-voltage busbar contactor. The medium-voltage busbar contactor can divide the train's medium-voltage busbar into different independent sections for power supply when a short circuit fault occurs.

[0004] Since fully automated driverless vehicles operate without a driver, the medium-voltage bus contactor should be tested before the vehicle is put into operation in fully automated driverless mode to ensure its availability and reliability.

[0005] Existing trains only control the opening and closing of the medium-voltage busbar contactor during operation, without testing the function of the medium-voltage busbar contactor. Since the fully automated driverless project has no driver, it is particularly important to test the function of the medium-voltage busbar contactor before the fully automated driverless vehicle is put into operation on the main line. Summary of the Invention

[0006] The purpose of this invention is to test the function of the medium-voltage busbar contactor before the train is put into full-automatic unmanned operation on the main line, to ensure the availability and reliability of the medium-voltage busbar contactor, and to realize the opening and closing control test of the medium-voltage busbar contactor through hard-wired circuit design and software command control of the train network control system, and to perform fault diagnosis and alarm of the medium-voltage busbar contactor, so as to ensure that the busbar contactor can work normally during the fully automatic unmanned operation of the train and improve the availability of the train auxiliary power supply system.

[0007] To achieve the above objectives, the present invention provides a self-testing method for medium-voltage busbar contactors in fully automated driverless trains, including a self-testing circuit for medium-voltage busbar contactors, specifically comprising the following steps:

[0008] Step 1: When performing a self-test on the medium-voltage bus contactor, the train network control system determines the conditions under which the medium-voltage bus contactor can operate. When all conditions are met, a closing command is output to the self-test circuit of the medium-voltage bus contactor.

[0009] The specific conditions for determining whether the medium-voltage busbar contactor is operational are as follows:

[0010] 1) No pantograph holding signal;

[0011] 2) No high voltage;

[0012] 3) No bow-raising command;

[0013] 4) None of the auxiliary inverters were in operation;

[0014] Step 2: Complete the closing of the medium-voltage busbar contactor and simultaneously check the status of the medium-voltage busbar contactor. If the feedback status is consistent with the test command, the medium-voltage busbar contactor is considered to be able to close normally.

[0015] If the collected feedback status is inconsistent with the test command, or if no status signal is received from the medium-voltage bus contactor within 2 seconds, the self-test of the medium-voltage bus contactor is considered to have failed, the medium-voltage bus contactor is considered to have a closing fault, and the train network control system will feed back the test failure result to the signal system and record and display the fault.

[0016] Step 3: Assuming the medium-voltage busbar contactor's closing function is normal, the train network control system determines the conditions under which the medium-voltage busbar contactor can operate. When all conditions are met, the medium-voltage busbar contactor's self-test circuit cancels the closing command.

[0017] The specific conditions for determining whether the medium-voltage busbar contactor is operational are as follows:

[0018] 1) No pantograph holding signal;

[0019] 2) No high voltage;

[0020] 3) No bow-raising command;

[0021] 4) None of the auxiliary inverters were in operation;

[0022] Step 4: Complete the disconnection of the medium-voltage busbar contactor and check the status of the medium-voltage busbar contactor. If the feedback status is consistent with the test command, it is considered that the medium-voltage busbar contactor can disconnect normally.

[0023] If the collected feedback status is inconsistent with the test command, or if no status signal is received from the medium-voltage bus contactor within 2 seconds, the self-test of the medium-voltage bus contactor is considered to have failed, the medium-voltage bus contactor is considered to have disconnected, and the train network control system will feed back the test failure result to the signal system and record and display the fault.

[0024] Step 5: When the medium-voltage bus contactor can both close and open normally, the self-test of the medium-voltage bus contactor is considered to have passed. The train network control system will feed back the successful self-test result to the signal system as one of the conditions for the train to enter the fully automatic unmanned driving mode.

[0025] During the self-test of the medium-voltage busbar contactor, after the train network control system determines that the closing conditions are met, it sequentially outputs a closing command and a closing command, controlling the medium-voltage busbar contactor to complete one closing and opening action. Simultaneously, it performs fault diagnosis based on the contactor's feedback status. If the medium-voltage busbar contactor self-test fails or the contactor malfunctions, the train network control system will report to the Operations Control Center (OCC) that the vehicle wake-up has failed, preventing it from entering unmanned driving mode and entering the main line. Furthermore, the auxiliary inverter will not be started, thus ensuring the reliability of the train and the availability of the auxiliary power supply system during fully automated unmanned operation. Attached Figure Description

[0026] Figure 1 This is the self-test circuit for the medium-voltage busbar contactor in this invention;

[0027] Figure 2 This is a flowchart of the self-test process for medium-voltage busbar contactors. Detailed Implementation

[0028] After the train network control system is powered on, a self-test is performed on the medium-voltage bus contactor. The train network control system controls the medium-voltage bus contactor to be energized and de-energized by outputting a closing command and an opening command once each, thereby achieving a forced closing and opening of the medium-voltage bus contactor. At the same time, the train network control system collects the status of the auxiliary contacts of the medium-voltage bus contactor, and determines the self-test status of the medium-voltage bus contactor by comparing the consistency between the feedback status and the output command.

[0029] The control principle of the medium-voltage busbar contactor is to avoid live operation (closing and opening). Therefore, the judgment condition for the train network control system to perform self-test on the medium-voltage busbar contactor is as follows:

[0030] 1) No pantograph holding signal;

[0031] 2) No high voltage;

[0032] 3) No bow-raising command;

[0033] 4) None of the auxiliary inverters were in operation.

[0034] When all the above conditions are met and the contactor is in the open state, the train network control system outputs a closing command for the medium-voltage bus contactor and simultaneously collects the feedback status of the auxiliary contacts of the medium-voltage bus contactor. When the feedback signal is closed, it indicates that the medium-voltage bus contactor's closing function is normal. When all self-test conditions are met and the contactor is in the closed state, the train network control system cancels the closing command for the medium-voltage bus contactor and simultaneously collects the feedback status of the auxiliary contacts of the medium-voltage bus contactor. When the feedback signal is open, it indicates that the medium-voltage bus contactor's opening function is normal. When both the opening and closing functions are normal, the medium-voltage bus contactor's self-test passes, and the train network control system feeds back the self-test result to the signal system as one of the criteria for the train to enter fully automatic unmanned driving mode.

[0035] A 2-second timeout is set in the self-test of the medium-voltage busbar contactor. If the feedback status collected during the medium-voltage busbar contactor closing or opening test is inconsistent with the control command, or if no status signal is received from the medium-voltage busbar contactor within 2 seconds, the self-test is considered a failure. The train network control system feeds back the failure result to the signal system and records and displays the fault. This enables functional testing and fault diagnosis of the medium-voltage busbar contactor before the fully automated driverless train is put into operation, ensuring the stability and reliability of train operation.

[0036] medium voltage busbar contactor self-test circuit as follows Figure 1 As shown, 31-K01 is the medium-voltage bus contactor, 31-K02 is the medium-voltage bus closing relay, contact 3-11 is the auxiliary contact of the medium-voltage bus closing relay 31-K02, and contacts C1-C2, C3-C4 and C5-C6 are auxiliary contacts of the medium-voltage bus contactor 31-K01 and are located on the medium-voltage bus. After the train network control system is powered on, it outputs a closing test command when it determines that the operating conditions of the medium-voltage bus contactor are met. In order to ensure the availability of the medium-voltage bus contactor, the closing command output by the train network control system is a redundant command to avoid the medium-voltage bus contactor failing to close due to a single output channel failure.

[0037] When the train network control system outputs a high-level closing test command, the medium-voltage busbar closing relay 31-K02 is energized. Figure 1 When the auxiliary contact 3-11 of the medium-voltage busbar closing relay 31-K02 closes, the medium-voltage busbar contactor 31-K01 is energized, and the medium-voltage busbar contactor 31-K02 completes the closing action.

[0038] When the train network control system cancels the high-level closing test command, the medium-voltage bus closing relay 31-K02 is de-energized. Figure 1When the auxiliary contact 3-11 of the medium-voltage busbar closing relay 31-K02 is opened, the medium-voltage busbar contactor 31-K01 is de-energized, and the medium-voltage busbar contactor completes the disconnection action.

[0039] The self-test flowchart for medium-voltage busbar contactors is as follows: Figure 2 As shown, during the self-test of the medium-voltage bus contactor, the train network control system determines the conditions under which the medium-voltage bus contactor can operate. The control principle of the medium-voltage bus contactor is to avoid energized operation (closing and opening). Therefore, the judgment conditions for the train network control system to perform self-test on the medium-voltage bus contactor are as follows:

[0040] 1) No pantograph holding signal;

[0041] 2) No high voltage;

[0042] 3) No bow-raising command;

[0043] 4) None of the auxiliary inverters were in operation.

[0044] When all conditions are met, a closing command is output to complete the closing of the medium-voltage bus contactor. At the same time, the status of the medium-voltage bus contactor is detected. If the status is consistent with the test command, the medium-voltage bus contactor is considered to be able to close normally; otherwise, the medium-voltage bus contactor is considered to have a closing fault. Similarly, under the premise that the medium-voltage bus contactor's closing function is normal, the train network control system determines the conditions under which the medium-voltage bus contactor can operate. When all conditions are met, the closing command is canceled (the medium-voltage bus contactor is disconnected), and the medium-voltage bus contactor is considered to be disconnected. At the same time, the status of the medium-voltage bus contactor is detected. If the status is consistent with the test command, the medium-voltage bus contactor is considered to be able to open and close; otherwise, the medium-voltage bus contactor is considered to have a disconnection fault.

[0045] The specific steps for the self-test method of the medium-voltage busbar contactor in a fully automated driverless train are as follows:

[0046] Step 1: When performing a self-test on the medium-voltage bus contactor, the train network control system determines the conditions under which the medium-voltage bus contactor can operate. When all conditions are met, a closing command is output.

[0047] The specific conditions for determining whether the medium-voltage busbar contactor is operational are as follows:

[0048] 1) No pantograph holding signal;

[0049] 2) No high voltage;

[0050] 3) No bow-raising command;

[0051] 4) None of the auxiliary inverters were in operation;

[0052] Step 2: Complete the closing of the medium-voltage busbar contactor and simultaneously check the status of the medium-voltage busbar contactor. If the feedback status is consistent with the test command, the medium-voltage busbar contactor is considered to be able to close normally.

[0053] If the collected feedback status is inconsistent with the test command, or if no status signal is received from the medium-voltage bus contactor within 2 seconds, the self-test of the medium-voltage bus contactor is considered to have failed, the medium-voltage bus contactor is considered to have a closing fault, and the train network control system will feed back the test failure result to the signal system and record and display the fault.

[0054] Step 3: Assuming the medium-voltage busbar contactor's closing function is normal, the train network control system determines the conditions under which the medium-voltage busbar contactor can operate. If all conditions are met, the closing command is revoked.

[0055] The specific conditions for determining whether the medium-voltage busbar contactor is operational are as follows:

[0056] 1) No pantograph holding signal;

[0057] 2) No high voltage;

[0058] 3) No bow-raising command;

[0059] 4) None of the auxiliary inverters were in operation;

[0060] Step 4: Complete the disconnection of the medium-voltage busbar contactor and check the status of the medium-voltage busbar contactor. If the feedback status is consistent with the test command, it is considered that the medium-voltage busbar contactor can disconnect normally.

[0061] If the collected feedback status is inconsistent with the test command, or if no status signal is received from the medium-voltage bus contactor within 2 seconds, the self-test of the medium-voltage bus contactor is considered to have failed, the medium-voltage bus contactor is considered to have disconnected, and the train network control system will feed back the test failure result to the signal system and record and display the fault.

[0062] Step 5: When the medium-voltage bus contactor can both close and open normally, the self-test of the medium-voltage bus contactor is considered to have passed. The train network control system will feed back the successful self-test result to the signal system as one of the conditions for the train to enter the fully automatic unmanned driving mode.

[0063] Through the circuit principles and logic processing of the train network control system described above, the self-testing of the medium-voltage bus contactor in the fully automated unmanned driving project can be realized, ensuring the availability and reliability of the medium-voltage bus contactor.

Claims

1. A self-testing method for a medium-voltage busbar contactor in a fully automatic driverless train, comprising a self-testing circuit for the medium-voltage busbar contactor, characterized in that, Specifically, the steps include the following: Step 1: When performing a self-test on the medium-voltage bus contactor, the train network control system determines the conditions under which the medium-voltage bus contactor can operate. When all conditions are met, a closing command is output to the self-test circuit of the medium-voltage bus contactor. The conditions for determining whether the medium-voltage busbar contactor is operational are as follows: 1) No pantograph holding signal; 2) No high voltage; 3) No bow-raising command; 4) None of the auxiliary inverters were in operation; Step 2: Complete the closing of the medium-voltage busbar contactor and simultaneously check the status of the medium-voltage busbar contactor. If the feedback status is consistent with the test command, the medium-voltage busbar contactor is considered to be able to close normally. If the collected feedback status is inconsistent with the test command, or if no status signal is received from the medium-voltage bus contactor within 2 seconds, the self-test of the medium-voltage bus contactor is considered to have failed, the medium-voltage bus contactor is considered to have a closing fault, and the train network control system will feed back the test failure result to the signal system and record and display the fault. Step 3: Assuming the medium-voltage busbar contactor's closing function is normal, the train network control system determines the conditions under which the medium-voltage busbar contactor can operate. When all conditions are met, the medium-voltage busbar contactor's self-test circuit cancels the closing command. The conditions for determining whether the medium-voltage busbar contactor is operational are as follows: 1) No pantograph holding signal; 2) No high voltage; 3) No bow-raising command; 4) None of the auxiliary inverters were in operation; Step 4: Complete the disconnection of the medium-voltage busbar contactor and check the status of the medium-voltage busbar contactor. If the feedback status is consistent with the test command, it is considered that the medium-voltage busbar contactor can disconnect normally. If the collected feedback status is inconsistent with the test command, or if no status signal is received from the medium-voltage bus contactor within 2 seconds, the self-test of the medium-voltage bus contactor is considered to have failed, the medium-voltage bus contactor is considered to have disconnected, and the train network control system will feed back the test failure result to the signal system and record and display the fault. Step 5: When the medium-voltage bus contactor can both close and open normally, the self-test of the medium-voltage bus contactor is considered to have passed. The train network control system will feed back the successful self-test result to the signal system as one of the conditions for the train to enter the fully automatic unmanned driving mode.

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