A control method and device of a short-circuit isolating switch for a train traction converter

Abstract

The application discloses a control method and device of a short-circuiting isolating switch for a train traction system, and relates to the technical field of train traction.The technical scheme points are as follows: real-time state information of a traction converter and an input current value of the traction converter are acquired;an action execution signal of the short-circuiting isolating switch is determined according to the real-time state information of the traction converter;whether the short-circuiting isolating switch is allowed to execute the action execution signal is judged according to the input current value;if allowed, the short-circuiting isolating switch is controlled to execute the action execution signal, and an action execution state of the short-circuiting isolating switch within a preset time is detected;and the running state of the traction converter is adjusted according to the action execution state of the short-circuiting isolating switch.Through the control method, the need of live closing of the short-circuiting isolating switch can be met, the service life and the use safety of the short-circuiting isolating switch are improved in time according to the state of the short-circuiting isolating switch, and the safety of the whole device is improved.

Description

Technical Field

[0001] This invention relates to the field of train traction technology, and specifically to a control method and device for a short-circuit isolating switch used in a train traction converter. Background Technology

[0002] This section is intended to provide background or context for the embodiments set forth in the claims. The description herein is not an admission that it is prior art simply because it is included in this section.

[0003] Traditional train traction converters are typically equipped with a charging contactor, a charging resistor, and a short-circuit contactor on the input side. When the main circuit breaker is closed, to prevent the high voltage of the traction transformer secondary winding (or the contact network voltage in DC power supply mode) from directly impacting the intermediate support capacitor of the converter, the charging contactor is usually closed first to charge the capacitor located in the intermediate DC circuit through the charging resistor. When the charging reaches a specified threshold, the short-circuit contactor is closed and the charging contactor is disconnected to avoid energy loss and resistor burnout caused by continuous operation of the charging resistor.

[0004] In existing technologies, to reduce the weight of rail transit vehicle traction systems, electrically operated disconnect switches are used instead of short-circuit contactors. At the positive terminal of each traction circuit, an electrically operated disconnect switch is added to control the opening and closing of the traction converter, achieving on / off control and isolation during severe faults. However, existing electrically operated disconnect switches typically control the opening and closing of the switch motor. Limited by the motor's driving capacity, the switch operates slowly. If a large current is applied to the switch, it may malfunction, causing damage. Furthermore, abnormal closure due to incomplete switch operation cannot be adjusted in time, introducing uncertainty into the traction converter and affecting equipment safety. Summary of the Invention

[0005] To address the aforementioned technical problems, this invention proposes a control method and device for a short-circuit disconnecting switch used in a train traction converter. This method allows the short-circuit disconnecting switch to operate under appropriate current and adjusts it promptly according to its status, thereby improving the service life and safety of the short-circuit disconnecting switch and enhancing the overall safety of the equipment.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by the present invention includes five aspects.

[0007] Firstly, a control method for a short-circuit isolating switch used in a train traction converter is provided, including the following steps:

[0008] Obtain real-time status information of the traction converter and the input current value of the traction converter;

[0009] The action execution signal of the short-circuit disconnect switch is determined based on the real-time status information of the traction converter.

[0010] Determine whether the action execution signal is allowed to be executed by short-circuiting the isolating switch based on the input current value;

[0011] If operation is permitted, control the short-circuit isolating switch to execute the action execution signal, and detect the action execution status of the short-circuit isolating switch within a preset time.

[0012] The operating state of the traction converter is adjusted according to the operational status of the short-circuit isolating switch.

[0013] In some embodiments, determining whether to allow short-circuiting the isolating switch to execute the action execution signal based on the input current value includes:

[0014] Select the current threshold value that allows the short-circuit disconnector to perform its operation;

[0015] The input current value is compared with a pre-selected current threshold value;

[0016] When the input current value is less than or equal to the current threshold value, the short-circuit isolating switch is allowed to execute the action execution signal.

[0017] In some embodiments, detecting the action execution status of the short-circuit disconnector switch within a preset time period includes:

[0018] Obtain the execution time required for the short-circuit disconnect switch to complete one action execution signal;

[0019] The execution time is increased by a reserved time to obtain a preset duration for which the short-circuit isolating switch is allowed to perform its action;

[0020] After the preset time period is reached, it is detected whether the short-circuit isolating switch has been executed in place.

[0021] In some embodiments, during the execution of the action execution signal by the short-circuit disconnecting switch within a preset time period, the input current value of the traction converter is monitored in real time and compared with a current threshold value. If the input current value is detected to be greater than the current threshold value, the current action execution signal is cancelled after the preset time period is reached.

[0022] In some embodiments, the train traction system includes a main circuit breaker, a traction transformer connected to the main circuit breaker, and a traction converter connected to the traction transformer; the traction converter includes a short-circuit disconnect switch connected to the traction transformer and a charging contactor and a charging resistor connected in parallel with the short-circuit disconnect switch.

[0023] The action execution signal includes a closing execution signal and a opening execution signal; determining the action execution signal for the short-circuit disconnecting switch based on the real-time status information of the traction converter includes:

[0024] When the traction converter is in a state where both the main circuit breaker and the charging contactor are closed, the DC voltage value of the traction converter is obtained.

[0025] Determine whether the DC voltage value has reached the threshold value; if it has reached the voltage threshold value, then obtain the closing execution signal for the short-circuit isolating switch.

[0026] In some embodiments, determining whether to allow short-circuiting the isolating switch to execute the action execution signal based on the input current value includes:

[0027] When the input current value determines that the short-circuit isolating switch is not allowed to execute the action execution signal, if the action execution signal of the short-circuit is closed, the short-circuit is controlled not to operate; if the action execution signal of the short-circuit is open, the main circuit breaker is controlled to open.

[0028] Based on the new action execution signal of the short-circuit isolating switch, the steps of obtaining the real-time status information of the traction converter and the input current value of the traction converter are re-executed.

[0029] In some embodiments, adjusting the operating state of the traction converter according to the operating state of the short-circuit disconnector includes:

[0030] When the action execution signal of the short-circuit is closed, it is determined whether the action of the short-circuit is properly executed; if it is not properly executed, the short-circuit is controlled to open.

[0031] When the action execution signal of the short-circuit is disconnected, it is determined whether the action of the short-circuit is disconnected. If it is not disconnected, the main circuit breaker is controlled to disconnect.

[0032] Secondly, this application provides a control device for a train traction system, the train traction system including a main circuit breaker, a traction transformer connected to the main circuit breaker, and a traction converter connected to the traction transformer; the traction converter includes a short-circuit isolating switch connected to the traction circuit breaker and a charging contactor and a charging resistor connected in parallel with the short-circuit isolating switch; the control device includes:

[0033] The acquisition unit is used to acquire real-time status information of the traction converter and the input current value of the traction converter.

[0034] The determining unit, connected to the acquisition unit, is used to determine the action execution signal of the short-circuit disconnecting switch based on the real-time status information of the traction converter.

[0035] The comparison unit connected to the determining unit determines, based on the input current value, whether it is permissible to short-circuit the isolating switch to execute the action execution signal.

[0036] The control unit connected to the comparison unit controls the short-circuit disconnector and the main circuit breaker, and controls the traction system status according to the action execution status of the short-circuit disconnector within a preset time.

[0037] Thirdly, this application provides an electronic device including a memory and a processor, wherein the memory stores a computer program that, when executed by the processor, performs the steps of the aforementioned control method.

[0038] Fourthly, this application provides a computer-readable storage medium storing a computer program that can be executed by one or more processors, the computer program being able to implement the steps of the control method described above.

[0039] Fifthly, this application provides a computer program product, including a computer program / instructions, characterized in that, when the computer program / instructions are executed by a processor, they implement the steps of the aforementioned control method.

[0040] Compared with the prior art, one or more embodiments of the above solutions may have the following advantages or beneficial effects:

[0041] This application provides a control method and device for a short-circuit disconnector switch used in a train traction system. The control method includes the following steps: acquiring real-time status information of the traction converter and the input current value of the traction converter; determining the action execution signal of the short-circuit disconnector switch based on the real-time status information of the traction converter; determining whether the short-circuit disconnector switch is allowed to execute the action execution signal based on the input current value; if so, controlling the short-circuit disconnector switch to execute the action execution signal and detecting the action execution status of the short-circuit disconnector switch within a preset time; adjusting the operating status of the traction converter based on the action execution status of the short-circuit disconnector switch. This control method enables the short-circuit disconnector switch to operate energized within the allowable current range, meets the requirement for energized closure of the short-circuit disconnector switch, and allows for timely adjustment based on the status of the short-circuit disconnector switch, thereby improving the service life and safety of the short-circuit disconnector switch and enhancing the overall safety of the equipment. Attached Figure Description

[0042] The present application will be described in more detail below based on embodiments and with reference to the accompanying drawings;

[0043] Figure 1 This is a flowchart illustrating a control method for a short-circuit isolating switch in a train traction system according to an embodiment of the present invention.

[0044] Figure 2 This is a schematic diagram of the circuit topology of the traction system in an embodiment of the present invention;

[0045] Figure 3 In the embodiments of the present invention, corresponding to Figure 1 An exemplary flowchart of step S2 shown;

[0046] Figure 4 In the embodiments of the present invention, corresponding to Figure 1 An exemplary flowchart of step S3 shown;

[0047] Figure 5 In the embodiments of the present invention, corresponding to Figure 1 A further exemplary flowchart of step S4 shown;

[0048] Figure 6 In the embodiments of the present invention, corresponding to Figure 1 A further exemplary flowchart of step S5 shown;

[0049] Figure 7 In the embodiments of the present invention, corresponding to Figure 1 Another exemplary flowchart further illustrating step S5 shown;

[0050] Figure 8 This is a schematic block diagram of a control device for a train traction system provided in an embodiment of the present invention;

[0051] Figure 9 This is a schematic block diagram of a control device provided in an embodiment of the present invention;

[0052] Figure 10 This is a schematic diagram of a computer-readable storage medium provided in an embodiment of the invention.

[0053] In the diagram: 1. Main circuit breaker; 2. Traction transformer; 3. Charging contactor; 4. Charging resistor; 5. Short-circuit isolating switch; 6. Rectifier; 7. Supporting capacitor; 8. Supporting resistor; 9. Inverter; 10. Traction motor; 11. Current sensor; 12. Traction converter; 101. Acquisition unit; 102. Determination unit; 103. Comparison unit; 104. Control unit; 21. Memory; 22. Processor; 31. Computer program.

[0054] In the accompanying drawings, the same parts are referred to by the same reference numerals, and the drawings are not drawn to scale. Detailed Implementation

[0055] The present disclosure will be further described below with reference to the embodiments shown in the accompanying drawings.

[0056] The existing control of electric disconnect switches usually involves regulating the opening and closing of the electric disconnect switch motor. However, due to the limited capacity of the electric disconnect switch drive motor, the electric disconnect switch operates relatively slowly. If the current value passing through the electric disconnect switch is large, it is easy for the disconnect switch to fail to operate normally, which can lead to damage. Furthermore, the abnormal closure caused by the disconnect switch not operating properly cannot be adjusted in time, which brings uncertainty to the traction converter and affects equipment safety.

[0057] This application discloses a control method for a short-circuit isolating switch used in a train traction system, such as... Figure 1 As shown, the system acquires the real-time status information and input current value of the traction converter; determines the action execution signal of the short-circuit disconnector based on the real-time status information of the traction converter; determines whether the short-circuit disconnector is allowed to execute the action execution signal based on the input current value; if so, controls the short-circuit disconnector to execute the action execution signal and detects the action execution status of the short-circuit disconnector within a preset time; adjusts the operating state of the traction converter based on the action execution status of the short-circuit disconnector. This control method enables the short-circuit disconnector to operate energized within the allowable current range, meets the requirement for energized closure of the short-circuit disconnector, protects the service life of the short-circuit disconnector, and improves equipment safety.

[0058] In some embodiments, such as Figure 2 As shown, this control method is applied to a train traction system, which includes a main circuit breaker 1, a traction transformer 2 connected to the main circuit breaker 1, and a traction converter 12 connected to the traction transformer 2. The traction converter 12 includes a short-circuit isolating switch 5 connected to the traction transformer 2, and a charging contactor 3 and a charging resistor 4 connected in parallel with the short-circuit isolating switch 5. The main circuit breaker 1 is connected to the train network-side equipment, and the side of the traction converter 12 away from the traction transformer 2 is connected to the traction motor 10. This control method can control the main circuit breaker 1 and the short-circuit isolating switch 5, and adjust the state of the traction converter 12 in a timely manner, thereby improving the operational safety of the traction system.

[0059] Some embodiments of this disclosure also provide control devices, electronic devices, storage media, and computer program products corresponding to the short-circuit disconnect switches for the above-described train traction systems.

[0060] This disclosure provides at least one embodiment of a control method for a short-circuit disconnector in a train traction system. This control method can be implemented in software, hardware, firmware, or any combination thereof, and can be loaded and executed by a processor in a device such as a mobile phone, tablet computer, laptop computer, desktop computer, or network server. This enables the short-circuit disconnector to operate under energized conditions within the allowable current range, meets the requirement for energized closure of the short-circuit disconnector, protects the service life of the short-circuit disconnector, and improves the safety of the equipment.

[0061] The following is for reference. Figure 1 As shown, a control method for a short-circuit isolating switch of a train traction system provided in at least one embodiment of the present disclosure will be described, the control method including steps S1 to S5.

[0062] S1. Obtain the real-time status information of the traction converter and the input current value of the traction converter.

[0063] In some embodiments, the traction converter includes a charging contactor, a charging resistor, a short-circuit isolating switch, a rectifier, a supporting capacitor, a supporting resistor, and an inverter. One side of the charging contactor is connected to the traction transformer, and the other side is connected to a current sensor to detect the input current value of the traction converter. The charging contactor and the charging resistor are connected in parallel to the short-circuit isolating switch. The other side of the current sensor is connected to the rectifier, and the other side of the rectifier is connected to the supporting capacitor in the middle. The supporting capacitor and the supporting resistor are connected in parallel and connected to the inverter to form an integral traction converter.

[0064] After the main circuit breaker is closed, to prevent high voltage from impacting the intermediate support capacitor of the converter, the charging contactor is usually closed first to charge the capacitor located in the intermediate DC circuit through the charging resistor. At this time, the short-circuit isolating switch is in the open state. When the charging reaches the specified threshold, the short-circuit isolating switch needs to be closed and the charging contactor disconnected to avoid power loss and resistor burnout caused by continuous operation of the charging resistor.

[0065] S2. Determine the action execution signal of the short-circuit isolating switch based on the real-time status information of the traction converter.

[0066] In some embodiments, the short-circuit disconnector is an electrically operated disconnector with two control commands (i.e., action execution signals). The action execution signals include a closing execution signal and a opening execution signal. The closing execution signal drives the electrically operated disconnector to the closed state, and the opening execution signal drives it to the open state. When the charging contactor of the traction converter closes, the DC voltage during the charging process is monitored in real time. When the DC voltage reaches a voltage threshold, it is determined that the short-circuit disconnector should close, i.e., the action execution signal for the short-circuit disconnector is determined to be the closing execution signal.

[0067] In some embodiments, such as Figure 3 As shown, determining the action execution signal for the short-circuit disconnector based on the real-time status information of the traction converter includes:

[0068] S21. When the traction converter is in a state where both the main circuit breaker and the charging contactor are closed, obtain the DC voltage value of the traction converter.

[0069] S22. Determine whether the DC voltage value has reached the threshold value; if it has reached the voltage threshold value, then obtain the closing execution signal of the short-circuit isolating switch.

[0070] S3. Determine whether the action execution signal is allowed to be executed by shorting the isolating switch based on the input current value.

[0071] In some embodiments, such as Figure 4 As shown, step S3 includes:

[0072] S31. Select the current threshold value that allows the short-circuit disconnector to perform its operation;

[0073] S32. Compare the input current value with a pre-selected current threshold value;

[0074] S33. When the input current value is less than or equal to the current threshold value, the short-circuit isolating switch is allowed to execute the action execution signal.

[0075] In some embodiments, a pre-selected current threshold value is obtained through short-circuit disconnector and traction converter tests. The maximum current value that allows the short-circuit disconnector to perform its operation is determined through multiple tests, ensuring that energized operation below this maximum current value will not damage the short-circuit disconnector and improving safety in use.

[0076] In some embodiments, determining whether to allow short-circuiting the isolating switch to execute the action execution signal based on the input current value further includes:

[0077] When the input current value determines that the short-circuit isolating switch is not allowed to execute the action execution signal; if the action execution signal of the short-circuit is closed, the short-circuit is controlled not to operate; if the action execution signal of the short-circuit is open, the main circuit breaker is controlled to open.

[0078] Based on the new action execution signal of the short-circuit isolating switch, the steps of obtaining the real-time status information of the traction converter and the input current value of the traction converter are re-executed.

[0079] If the input current value is greater than the current threshold value, the short-circuit disconnector is not allowed to execute the action execution signal. That is, it is determined that the input current value does not allow the short-circuit disconnector to execute the action execution signal. Then, the short-circuit disconnector or the main circuit breaker is controlled by the action execution signal of the short-circuit disconnector. After that, according to the new round of action execution signal of the short-circuit disconnector, the steps of obtaining the real-time status information of the traction converter and the input current value of the traction converter are re-executed to ensure the safe use of the traction converter.

[0080] S4. If running, control the short-circuit isolating switch to execute the action execution signal, and detect the action execution status of the short-circuit isolating switch within a preset time.

[0081] In some embodiments, such as Figure 5 As shown, detecting the action execution status of the short-circuit disconnector within a preset time includes:

[0082] S41. Obtain the execution time required for the short-circuit isolating switch to complete one action execution signal;

[0083] S42. Add a reserved time to the execution time to obtain a preset time that allows the short-circuit isolating switch to perform its action;

[0084] S43. After the preset time period is reached, check whether the short-circuit isolating switch has been executed in place.

[0085] In some embodiments, the short-circuit disconnector is an electrically operated disconnector. Due to the limited capacity of the motor driving the electrically operated disconnector, the time required for the short-circuit disconnector to go from the open state to full closure is T1. Therefore, the execution time is denoted as T1 to ensure that the short-circuit disconnector does not remain in an unstable intermediate state, thus improving operational safety. Simultaneously, to accommodate situations where the time required for each action of the short-circuit disconnector is not entirely consistent, a reserved action time of T2 is provided. That is, a preset time for allowing the short-circuit disconnector to act is set as Tpreset = T1 + T2. This ensures that the short-circuit disconnector can complete its action within the preset time under normal conditions, avoiding lingering in an unstable intermediate state and improving operational safety.

[0086] In some embodiments, when the short-circuit isolating switch executes the action execution signal, it will provide real-time feedback on its working status. Therefore, after a preset time has elapsed, the working status feedback from the short-circuit isolating switch can be used to determine whether the action execution signal has been executed in place, so as to make adaptive adjustments and ensure operational safety.

[0087] In some embodiments, during the operation of the short-circuit isolator within a preset time, the input current value of the traction converter is monitored in real time, and the real-time input current value is compared with the current threshold value. If the input current value is detected to be greater than the current threshold value within the preset time, it does not affect the operation of the short-circuit isolator. The current operation signal should be cancelled after the preset time is reached to avoid the short-circuit isolator from remaining in an uncertain intermediate state.

[0088] S5. Adjust the operating state of the traction converter according to the operation status of the short-circuit isolating switch.

[0089] In some embodiments, such as Figure 6 and Figure 7 As shown, adjusting the operating state of the traction converter according to the operating state of the short-circuit disconnector includes:

[0090] S51. When the action execution signal of the short-circuit is closed, determine whether the action of the short-circuit isolating switch has been executed properly; if it has not been executed properly, control the short-circuit isolating switch to open, and end the current control process after opening; if it has been executed properly, end the current control process directly.

[0091] S52. When the action execution signal of the short-circuit is disconnected, determine whether the action of the short-circuit is disconnected. If it is not disconnected, control the main circuit breaker to disconnect and end the current control process after disconnection; if it is disconnected, end the current control process directly.

[0092] In some embodiments, by determining whether the short-circuit isolating switch has been properly operated, timely adjustments can be made to avoid the uncertainty caused by abnormal disconnection of the short-circuit isolating switch to the operation of the traction system. If the short-circuit isolating switch is abnormally disconnected, the main circuit may still be connected. By disconnecting the main circuit breaker, the power input of the entire traction system is cut off, achieving safety guidance and improving the safety of the traction system operation.

[0093] The control method for a short-circuit disconnector provided in this disclosure detects the input current value of the traction converter and compares it with the current threshold value that allows the short-circuit disconnector to operate. This determines whether the short-circuit disconnector is allowed to operate according to the operation execution signal. This ensures the short-circuit disconnector operates within the permissible current range, meeting the requirement for energized closure and guaranteeing its service life and operational safety. Furthermore, during the operation of the short-circuit disconnector, a preset time is allocated for its execution, and the state of the traction converter is adjusted based on the execution result. This ensures the safety of the train traction system and prevents the short-circuit disconnector from failing to operate properly and remaining in an uncertain intermediate state. This achieves safety guidance, protects the service life of the short-circuit disconnector, and improves equipment safety.

[0094] At least some embodiments of this disclosure also provide a control device for a train traction system, such as Figure 2 and Figure 8 As shown, the train traction system includes a main circuit breaker 1, a traction transformer 2 connected to the main circuit breaker 1, and a traction converter 12 connected to the traction transformer 2; the traction converter 12 includes a short-circuit isolating switch 5 connected to the traction circuit breaker, and a charging contactor 3 and a charging resistor 4 connected in parallel with the short-circuit isolating switch 5; the control device includes:

[0095] The acquisition unit 101 is used to acquire the real-time status information of the traction converter 12 and the input current value of the traction converter 12.

[0096] The determining unit 102, which is connected to the acquisition unit 101, is used to determine the action execution signal of the short-circuit disconnect switch 5 based on the real-time status information of the traction converter 12.

[0097] The comparison unit 103, connected to the determination unit 102, determines whether it is permissible to short-circuit the isolating switch 5 to execute the action execution signal based on the input current value.

[0098] The control unit 104, which is connected to the comparison unit 103, is used to control the short-circuit isolating switch 5 and the main circuit breaker 1, and to control the traction system state according to the action execution state of the short-circuit isolating switch 5 within a preset time.

[0099] In some embodiments, the comparison unit 103 is set with a current threshold value that allows the short-circuit disconnector 5 to execute the action execution signal. Then, when the short-circuit disconnector 5 needs to execute the action, the input current value of the traction converter 12 is obtained and compared with the current threshold value to determine whether the short-circuit disconnector 5 is allowed to operate. This ensures that the short-circuit disconnector 5 is energized and performs the action within the allowable current threshold value range, which satisfies the availability of the disconnector and improves the service life and safety of the short-circuit disconnector 5.

[0100] In some embodiments, the short-circuit disconnector 5 is an electrically operated disconnector with two control commands (i.e., action execution signals). The action execution signals include a closing execution signal and a opening execution signal. The closing execution signal drives the electrically operated disconnector to rotate to the closed state, and the opening execution signal drives the electrically operated disconnector to rotate to the open state. When the charging contactor 3 of the traction converter 12 is closed, the DC voltage during the charging process is monitored in real time. When the DC voltage reaches a threshold value, it is determined that the short-circuit disconnector 5 should be closed, that is, the action execution signal of the short-circuit disconnector 5 is determined to be the closing execution signal.

[0101] In some embodiments, the traction converter 12 further includes a rectifier 6, a supporting capacitor 7, a supporting resistor 8, and an inverter 9; one side of the charging contactor 3 is connected to the traction transformer 2, and the other side is connected to a current sensor 11 to detect the input current value of the traction converter 12; the charging contactor 3 and the charging resistor 4 are connected in parallel to the short-circuit isolating switch 5; the other side of the current sensor 11 is connected to the rectifier 6, the other side of the rectifier 6 is connected to the supporting capacitor 7 in the middle, the supporting capacitor 7 and the supporting resistor 8 are connected in parallel and connected to the inverter 9 to form the overall traction converter 12.

[0102] In some embodiments, the control unit 104 makes corresponding control signals in a timely manner based on the action status feedback of the short-circuit isolating switch 5. When the short-circuit isolating switch 5 is executed to the required position, the current control process ends. If the short-circuit isolating switch 5 is abnormally disconnected, the main circuit breaker 1 is controlled to disconnect to cut off the power input of the traction system and improve safety.

[0103] At least some embodiments of this disclosure also provide an electronic device, such as Figure 9 As shown, the electronic device includes a memory 21 and a processor 22. The memory 21 stores a computer program that, when executed by the processor, performs the steps of the control method provided in any embodiment of this disclosure.

[0104] In some embodiments, processor 22 is used to perform all or part of the steps in the control method as described in any embodiment of this disclosure. Memory 21 is used to store various types of data, which may include, for example, instructions for any application or method in an electronic device, as well as application-related data.

[0105] The processor 22 may be implemented as an application-specific integrated circuit (ASIC), a digital signal processor (DSP), a digital signal processing device (DSPD), a programmable logic device (PLD), a field-programmable gate array (FPGA), a controller, a microcontroller, a microprocessor, or other electronic components, and is used to execute the control method in Embodiment 1 above.

[0106] The memory 21 can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as Static Random Access Memory (SRAM), Electrically Erasable Programmable Read-Only Memory (EEPROM), Erasable Programmable Read-Only Memory (EPROM), Programmable Read-Only Memory (PROM), Read-Only Memory (ROM), magnetic storage, flash memory, magnetic disk, or optical disk.

[0107] At least some embodiments of this disclosure also provide a computer-readable storage medium, such as Figure 10 As shown, the readable storage medium stores a computer program 31, which, when executed by a processor, implements the steps of the control method provided in any embodiment of this disclosure.

[0108] In some embodiments, the storage medium may be a tangible medium that may contain or store a program for use by or in conjunction with an instruction execution system, apparatus, or device. A machine-readable medium may be a machine-readable signal medium or a machine-readable storage medium. Machine-readable media may include, but are not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, apparatus, or devices, or any suitable combination thereof. More specific examples of machine-readable storage media include electrical connections based on one or more wires, portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof.

[0109] To provide interaction with a user, the systems and techniques described herein can be implemented on a computer having: a display device for displaying information to the user (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor); and a keyboard and pointing device (e.g., a mouse or trackball) through which the user provides input to the computer. Other types of devices can also be used to provide interaction with the user; for example, feedback provided to the user can be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user can be received in any form (including sound input, voice input, or tactile input).

[0110] The systems and technologies described herein can be implemented in computing systems that include backend components (e.g., as a data server), or computing systems that include middleware components (e.g., an application server), or computing systems that include frontend components (e.g., a user computer with a graphical user interface or web browser through which a user can interact with embodiments of the systems and technologies described herein), or any combination of such backend, middleware, or frontend components. The components of the system can be interconnected via digital data communication of any form or medium (e.g., a communication network). Examples of communication networks include local area networks (LANs), wide area networks (WANs), and the Internet.

[0111] Computer systems can include clients and servers. Clients and servers are generally located far apart and typically interact via communication networks. Client-server relationships are created by computer programs running on the respective computers and having a client-server relationship with each other. Servers can be cloud servers, servers in distributed systems, or servers incorporating blockchain technology.

[0112] This invention also provides a computer program product, including a computer program / instructions that, when executed by a processor, implement the steps of the control method provided in any embodiment of this disclosure.

[0113] In summary, the control method, device, equipment, and storage medium for a short-circuit disconnector for a train traction converter provided in this application detect the input current value of the traction converter and compare it with the current threshold value that allows the short-circuit disconnector to operate according to the action execution signal. This enables the short-circuit disconnector to operate energized within the allowable current range, meets the requirement for energized closure of the short-circuit disconnector, and ensures the service life and safety of the short-circuit disconnector. Furthermore, during the execution of the short-circuit disconnector, a preset time is provided for its operation, and the state of the traction converter is adjusted based on the execution result. This ensures the safety of the train traction system operation and avoids situations where the short-circuit disconnector fails to operate properly and remains in an uncertain intermediate state, thus achieving safety guidance, protecting the service life of the short-circuit disconnector, and improving the safety of equipment operation.

[0114] The various embodiments in this disclosure are described in a progressive manner. The same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on describing the differences from other embodiments.

[0115] The scope of protection of this disclosure is not limited to the embodiments described above. Obviously, those skilled in the art can make various modifications and variations to this disclosure without departing from its scope and spirit. If such modifications and variations fall within the scope of the claims of this disclosure and their equivalents, then the intent of this disclosure also includes such modifications and variations.

Claims

1. A control method for a short-circuit isolating switch used in a train traction converter, characterized in that, Includes the following steps: Obtain real-time status information of the traction converter and the input current value of the traction converter; The action execution signal of the short-circuit is determined based on the real-time status information of the traction converter; the real-time status information of the traction converter includes the DC voltage value of the traction converter. Determine whether the action execution signal is allowed to be executed by short-circuiting the isolating switch based on the input current value; If operation is permitted, control the short-circuit isolating switch to execute the action execution signal, and detect the action execution status of the short-circuit isolating switch within a preset time. The operating state of the traction converter is adjusted according to the operational status of the short-circuit disconnector; The step of determining whether to allow the short-circuit disconnector to execute the action execution signal based on the input current value includes: selecting a current threshold value for allowing the short-circuit disconnector to execute the action; the current threshold value includes the maximum current value for allowing the short-circuit disconnector to execute the action; comparing the input current value with the pre-selected current threshold value; and allowing the short-circuit disconnector to execute the action execution signal when the input current value is less than or equal to the current threshold value. The detection of the action execution status of the short-circuit disconnector within a preset time includes: obtaining the execution time required for the short-circuit disconnector to complete one action execution signal; adding a reserved time to the execution time to obtain a preset duration for which the short-circuit disconnector is allowed to perform the action; and detecting whether the short-circuit disconnector has completed the action after the preset duration has been reached. The control method is applied to a train traction system, which includes a main circuit breaker, a traction transformer connected to the main circuit breaker, and a traction converter connected to the traction transformer. The traction converter includes a short-circuit isolating switch connected to the traction transformer and a charging contactor and a charging resistor connected in parallel with the short-circuit isolating switch. The action execution signals include a closing execution signal and a opening execution signal. The step of determining whether to allow short-circuiting the isolating switch to execute the action execution signal based on the input current value includes: When the input current value determines that the short-circuit isolating switch is not allowed to execute the action execution signal, if the action execution signal of the short-circuit is closed, the short-circuit is controlled not to operate; if the action execution signal of the short-circuit is open, the main circuit breaker is controlled to open. Based on the new action execution signal of the short-circuit isolating switch, the steps of obtaining the real-time status information of the traction converter and the input current value of the traction converter are re-executed.

2. The control method for a short-circuit isolating switch for a train traction converter according to claim 1, characterized in that, During the execution of the action execution signal within a preset time period, the short-circuit disconnecting switch monitors the input current value of the traction converter in real time and compares it with the current threshold value. If the input current value is detected to be greater than the current threshold value, the current action execution signal is canceled after the preset time period is reached.

3. The control method for a short-circuit isolating switch for a train traction converter according to claim 1, characterized in that, The step of determining the action execution signal for the short-circuit disconnector based on the real-time status information of the traction converter includes: When the traction converter is in a state where both the main circuit breaker and the charging contactor are closed, the DC voltage value of the traction converter is obtained. Determine whether the DC voltage value has reached the threshold value; if it has reached the voltage threshold value, then obtain the closing execution signal for the short-circuit isolating switch.

4. The control method for a short-circuit isolating switch for a train traction converter according to claim 3, characterized in that, The step of adjusting the operating state of the traction converter according to the operating state of the short-circuit disconnector includes: When the action execution signal of the short-circuit is closed, it is determined whether the action of the short-circuit is properly executed; if it is not properly executed, the short-circuit is controlled to open. When the action execution signal of the short-circuit is disconnected, it is determined whether the action of the short-circuit is disconnected. If it is not disconnected, the main circuit breaker is controlled to disconnect.

5. A control device for a train traction system, characterized in that, The train traction system includes a main circuit breaker, a traction transformer connected to the main circuit breaker, and a traction converter connected to the traction transformer; the traction converter includes a short-circuit disconnector connected to the traction circuit breaker and a charging contactor and a charging resistor connected in parallel with the short-circuit disconnector. The control device includes: The acquisition unit is used to acquire real-time status information of the traction converter and the input current value of the traction converter. The determining unit, connected to the acquisition unit, is used to determine the action execution signal of the short-circuit disconnect switch based on the real-time status information of the traction converter; the real-time status information of the traction converter includes the DC voltage value of the traction converter. The comparison unit connected to the determining unit determines, based on the input current value, whether it is permissible to short-circuit the isolating switch to execute the action execution signal. And a control unit connected to the comparison unit, used to control the short-circuit disconnector and the main circuit breaker, and to control the traction system status according to the action execution status of the short-circuit disconnector within a preset time. The step of determining whether to allow the short-circuit disconnector to execute the action execution signal based on the input current value includes: selecting a current threshold value for allowing the short-circuit disconnector to execute the action; the current threshold value includes the maximum current value for allowing the short-circuit disconnector to execute the action; comparing the input current value with the pre-selected current threshold value; and allowing the short-circuit disconnector to execute the action execution signal when the input current value is less than or equal to the current threshold value. Detecting the action execution status of the short-circuit disconnector within a preset time includes: obtaining the execution time required for the short-circuit disconnector to complete one action execution signal; adding a reserved time to the execution time to obtain a preset duration for allowing the short-circuit disconnector to perform the action; and after the preset duration is reached, detecting whether the short-circuit disconnector has completed the action. The action execution signal includes a closing execution signal and a disconnecting execution signal; The step of determining whether to allow short-circuiting the isolating switch to execute the action execution signal based on the input current value includes: When the input current value determines that the short-circuit isolating switch is not allowed to execute the action execution signal, if the action execution signal of the short-circuit is closed, the short-circuit is controlled not to operate; if the action execution signal of the short-circuit is open, the main circuit breaker is controlled to open. Based on the new action execution signal of the short-circuit isolating switch, the steps of obtaining the real-time status information of the traction converter and the input current value of the traction converter are re-executed.

6. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the steps of the control method according to any one of claims 1 to 4.

7. A computer-readable storage medium, characterized in that, When a computer program is executed by a processor, it implements the steps of the control method as described in any one of claims 1 to 4.

8. A computer program product comprising a computer program / instructions, characterized in that, When the computer program / instructions are executed by the processor, they implement the steps of the control method as described in any one of claims 1-4.

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