A traction converter bridge arm shoot-through fault identification and protection method and device

Abstract

The application provides a traction converter bridge arm shoot-through fault identification and protection method and device, and solves the problem that the driver cannot locate the fault cause in multiple fault information in the HMI screen. The traction converter bridge arm shoot-through fault identification and protection method comprises the following steps: detecting whether a fault occurs inside the converter; if a fault occurs inside the converter, judging whether the fault inside the converter meets the condition of the bridge arm shoot-through fault; if the condition of the bridge arm shoot-through fault is met, it is determined that the bridge arm shoot-through fault occurs; when the bridge arm shoot-through fault occurs, the network is reported, and the protection measure is started.

Description

Technical Field

[0001] This invention relates to the field of train traction control technology, specifically to a method and device for identifying and protecting against a traction converter arm shoot-through fault. Background Technology

[0002] The traction converter in the power system of a high-speed electric multiple unit (EMU) consists of multiple IGBT devices in its internal rectifier and inverter modules. If an IGBT fails, causing a bridge arm shoot-through fault in either the rectifier or inverter module, the converter's internal protection logic will identify multiple fault messages and send them to the vehicle's network control system. The network control system then transmits the fault information to the driver's HMI screen, where the driver responds based on the displayed fault information. Because a bridge arm shoot-through fault within the converter module is often accompanied by multiple faults, the driver may be unable to pinpoint the cause of the fault among the numerous fault messages on the HMI screen. This can prevent the driver from taking appropriate action and could lead to train delays. Summary of the Invention

[0003] In view of this, embodiments of the present invention provide a method and device for identifying and protecting traction converter arm shoot-through faults, which solves the problem that drivers cannot locate the cause of a fault among multiple fault messages on the HMI screen.

[0004] In a first aspect, an embodiment of the present invention provides a method for identifying and protecting a traction converter arm shoot-through fault, comprising:

[0005] Check for internal faults in the converter;

[0006] If a fault occurs inside the converter, determine whether the fault inside the converter meets the conditions for a bridge arm shoot-through fault.

[0007] If the conditions for a bridge arm shoot-through fault are met, then a bridge arm shoot-through fault is determined to have occurred.

[0008] When a bridge arm straight-through fault occurs, it is reported to the network and protection measures are activated.

[0009] In one implementation, determining whether an internal converter fault meets the criteria for a bridge arm shoot-through fault includes: the following faults occurring simultaneously constitute a bridge arm shoot-through fault:

[0010] Both the first and second quadrant rectifier modules experienced input overcurrent faults.

[0011] The intermediate DC voltage is lower than the preset value for bridge arm shoot-through fault protection;

[0012] The protection against faults of any one of the following modules: the first four-quadrant rectifier module, the second four-quadrant rectifier module, the first traction inverter module, the second traction inverter module, and the auxiliary inverter module.

[0013] In one implementation, it further includes:

[0014] When a bridge arm shoot-through derivative fault is detected, the bridge arm shoot-through derivative fault is filtered.

[0015] Determine whether the bridge arm straight-through fault is caused by the bridge arm straight-through. If so, do not report the bridge arm straight-through fault to the vehicle network; otherwise, report the bridge arm straight-through fault to the vehicle network.

[0016] In one implementation, determining whether the bridge arm shoot-through-derived fault is caused by a bridge arm shoot-through includes:

[0017] When a bridge arm through-through fault is detected, the bridge arm through-through fault is filtered for a preset time, and the bridge arm through-through fault is not reported to the vehicle network for the time being.

[0018] If a module arm shoot-through fault is detected in the converter within a preset time, it is considered that the shoot-through-derived fault is caused by the module arm shoot-through; or

[0019] If no module arm shoot-through fault is detected in the converter within a preset time, it is considered that the shoot-through fault is not caused by module arm shoot-through.

[0020] In one embodiment, the bridge arm shoot-through fault includes at least one of the following: overcurrent at the input of the first four-quadrant rectifier module, overcurrent at the input of the second four-quadrant rectifier module, overcurrent at the output of the first traction inverter module, overcurrent at the output of the second traction inverter module, and overcurrent in the auxiliary inverter module.

[0021] In one embodiment, the opening protection measures include at least one of: disconnecting the vehicle VCB, isolating converter charging, and short-circuiting the contactor.

[0022] Secondly, an embodiment of the present invention provides a traction converter arm shoot-through fault identification and protection device, comprising:

[0023] First and second quadrant current sensors;

[0024] First and second quadrant rectifier modules;

[0025] First traction inverter module and second traction inverter module;

[0026] First traction inverter current sensor and second traction inverter current sensor;

[0027] The first unit consists of a first four-quadrant current sensor, a first four-quadrant rectifier module, a first traction inverter module, and a first traction inverter current sensor; the second unit consists of a second four-quadrant current sensor, a second four-quadrant rectifier module, a second traction inverter module, and a second traction inverter current sensor.

[0028] Auxiliary inverter module;

[0029] Auxiliary transformer output current sensor;

[0030] The auxiliary inverter module and the auxiliary inverter output current sensor constitute the third unit;

[0031] The first input terminal of the auxiliary inverter module is connected between the first four-quadrant rectifier module and the first traction inverter module; the second input terminal of the auxiliary inverter module is connected between the second four-quadrant rectifier module and the second traction inverter module.

[0032] In one embodiment, it further includes an intermediate voltage sensor connected in parallel with the first traction inverter module.

[0033] In one implementation, the first four-quadrant rectifier module, the second four-quadrant rectifier module, the first traction inverter module, the second traction inverter module, and the auxiliary inverter module share a common intermediate voltage circuit.

[0034] In one embodiment, the internal structure of the first four-quadrant rectifier module, the second four-quadrant rectifier module, the first traction inverter module, the second traction inverter module, and the auxiliary inverter module all include: multiple IGBT units, wherein two IGBT units are connected in series to form an upper and lower bridge arm, and the multiple upper and lower bridge arms are connected in parallel.

[0035] This invention provides a method for identifying and protecting traction converter arm shoot-through faults. The transmission control unit (TCU) inside the converter detects whether a fault has occurred within the converter. If a fault occurs, it determines whether the fault meets the conditions for an arm shoot-through fault. If the conditions are met, an arm shoot-through fault is identified. When an arm shoot-through fault occurs, it reports it to the network and activates protection measures. This invention does not rely on additional hardware. By utilizing existing fault information and intermediate voltage changes, it accurately identifies traction converter module arm shoot-through faults. Simultaneously, it displays numerous derivative faults accompanying the module arm shoot-through fault, filtering out unnecessary faults and reducing network pop-up errors. This allows train drivers to quickly identify the cause of the fault and take appropriate action. After the converter identifies the module arm shoot-through fault, it promptly disconnects the main circuit breaker, isolating the converter and preventing the faulty converter from being restarted, thus avoiding further escalation of the fault. Attached Figure Description

[0036] Figure 1 The diagram shown is a flowchart illustrating a method for identifying and protecting a traction converter arm shoot-through fault according to an embodiment of the present invention.

[0037] Figure 2 The diagram shown is a schematic diagram of the basic internal structure of a traction converter according to an embodiment of the present invention.

[0038] Figure 3 The diagram shown is a structural schematic of a four-quadrant rectifier module provided in an embodiment of the present invention.

[0039] Figure 4 The diagram shown is a structural schematic of an inverter module provided in an embodiment of the present invention.

[0040] Figure 5 The diagram shown is a flowchart illustrating a traction converter arm shoot-through fault identification and protection device according to an embodiment of the present invention.

[0041] Explanation of reference numerals in the attached drawings: 1-Main circuit breaker; 2-First and second windings of the secondary side of the traction transformer; 3-Charging contactor (including first and second charging contactors); 4-Short-circuit contactor (including first and second short-circuit contactors); 5-Four-quadrant current sensor (including first and second four-quadrant current sensors); 6-Four-quadrant rectifier module (including first and second four-quadrant modules); 7-Intermediate voltage sensor; 8-Traction inverter module (including first and second traction inverter modules); 9-Traction inverter current sensor (including first and second traction inverter current sensors); 10-Auxiliary inverter module; 11-Auxiliary transformer output current sensor; 12-Auxiliary transformer output contactor. Detailed Implementation

[0042] 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, and 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.

[0043] The inventors of this application have discovered shortcomings in current methods for identifying, protecting against, and displaying faults in rectifier and inverter module arm shoot-through of traction converters:

[0044] 1) The traction control system cannot accurately identify the bridge arm straight-through fault and send it to the train network control system. Bridge arm straight-through is often accompanied by module faults and overcurrent faults. The traction system sends many faults to the train network system at the same time, making it impossible for the driver to identify the cause of the fault, and making it impossible or improper sampling to take measures, which can easily cause train delays and other adverse effects.

[0045] 2) Once a bridge arm shoot-through fault occurs inside the traction converter, the traction converter must be isolated immediately so that it is no longer put into operation. Since the traction converter cannot accurately identify the module bridge arm shoot-through fault at present, the traction converter itself cannot take timely and correct protection measures, which may cause the traction converter to be restarted multiple times due to the fault, resulting in the fault being amplified.

[0046] To address the aforementioned problems, this invention proposes a method and device for identifying and protecting against traction converter arm shoot-through faults. This invention can quickly identify the corresponding module arm shoot-through fault, filter out derivative fault information after locating the fault, and simultaneously implement appropriate protection measures. This helps the driver quickly pinpoint the cause of the fault and take correct handling measures, reducing the impact on driving. Specific implementation methods are described in the following embodiments.

[0047] In one embodiment of the present invention, when a bridge arm shoot-through fault occurs inside the four-quadrant rectifier module 6, traction inverter module 8, and auxiliary inverter module 10 during the operation of a traction converter with a common intermediate circuit (meaning that the traction converter has at least two traction inverters inside, and multiple traction inverters share a common intermediate circuit), it will cause a rapid drop in the intermediate voltage. The unstable intermediate voltage will cause control misalignment of the traction inverter and auxiliary inverter at the downstream end of the converter, leading to the transmission control unit (TCU) inside the converter detecting peak overcurrent faults in the traction inverter and auxiliary inverter, and reporting the fault information to the network. Since a bridge arm shoot-through is equivalent to a short circuit in the intermediate DC link of the converter, it will cause an increase in the front-end four-quadrant current, leading the TCU to detect four-quadrant peak overcurrent and report the fault information to the network; simultaneously, due to damage to the IGBT unit module, the TCU itself will receive IGBT fault information and report it to the network. Therefore, when a module bridge arm shoot-through fault occurs inside the converter, the following fault will be reported to the vehicle network:

[0048] 1. A four-quadrant input overcurrent

[0049] 2. Two-frame four-quadrant input overcurrent

[0050] 3. Auxiliary inverter overcurrent

[0051] 4. Overcurrent output of one traction inverter

[0052] 5. Overcurrent at the output of the two traction inverters

[0053] 6. Module A component protection (A represents the module that has failed, including the first and second four-quadrant inverters and the first and second traction inverter auxiliary inverters)

[0054] Among the reported network faults, apart from the component protection fault of module A, the overcurrent of the four-quadrant input of the first and second racks, the overcurrent of the auxiliary inverter, and the overcurrent of the output of the first and second traction inverters are all faults that occur when the module bridge arm is shot-through. These are defined as derivative faults of bridge arm shot-through.

[0055] This embodiment provides a method for identifying and protecting against shoot-through faults in the arm of a traction converter, such as... Figure 1 As shown, the method for identifying and protecting against shoot-through faults in the traction converter arm includes:

[0056] Step 01: Detect internal faults in the converter. When the traction system starts running, the traction converter drive control unit (TCU) detects internal faults in the converter based on detected four-quadrant overcurrent faults, IGBT module faults, and changes in intermediate voltage.

[0057] Step 02: If a fault occurs inside the converter, determine whether the fault meets the conditions for a bridge arm shoot-through fault. A bridge arm shoot-through fault is met when the following faults occur simultaneously:

[0058] 1. Both the first four-quadrant rectifier module 6 and the second four-quadrant rectifier module 6 experienced input overcurrent faults;

[0059] 2. The intermediate DC voltage is lower than the preset value for bridge arm shoot-through fault protection;

[0060] 3. Any one of the following modules is protected against a fault: the first four-quadrant rectifier module 6, the second four-quadrant rectifier module 6, the first traction inverter module 8, the second traction inverter module 8, and the auxiliary inverter module 10.

[0061] Step 03: If the conditions for a bridge arm straight-through fault are met, then a bridge arm straight-through fault is determined to have occurred.

[0062] Step 04: When a bridge arm shoot-through fault occurs, report it to the network and activate protection measures. These protection measures include: disconnecting the vehicle's VCB, isolating converter charging, and short-circuiting the contactor. Therefore, when a bridge arm shoot-through fault occurs inside the converter, it indicates a short circuit in the intermediate DC link of the converter, which can trigger serious faults such as four-quadrant overcurrent. In this case, immediate protective measures should be taken, including disconnecting the vehicle's VCB (vacuum circuit breaker), isolating converter charging, and short-circuiting the contactor.

[0063] In addition to the steps mentioned above, a new fault definition, "Traction Converter Module Arm Shot-Through Fault," is added in agreement with the vehicle network. When the converter identifies any module arm shot-through fault, it directly reports the fault to the network. When a fault derived from arm shot-through occurs, it is filtered. If the fault is determined to be caused by arm shot-through, it is not reported to the network; otherwise, it is reported to the network. The specific process is as follows:

[0064] Step 05: When a bridge arm shoot-through derivative fault is detected, the bridge arm shoot-through derivative fault is filtered. The bridge arm shoot-through derivative fault includes at least one of the following: overcurrent at the input of the first four-quadrant rectifier module 6, overcurrent at the input of the second four-quadrant rectifier module 6, overcurrent at the output of the first traction inverter module 8, overcurrent at the output of the second traction inverter module 8, and overcurrent in the auxiliary inverter module 10.

[0065] Step 06: Determine whether the bridge arm straight-through fault is caused by bridge arm straight-through. If so, do not report the bridge arm straight-through fault to the vehicle network; if not, report the bridge arm straight-through fault to the vehicle network.

[0066] Specifically, determining whether the bridge arm shoot-through-derived fault is caused by bridge arm shoot-through includes:

[0067] Step 061: When a bridge arm through-through fault is detected, the bridge arm through-through fault is filtered for a preset time, and the bridge arm through-through fault is not reported to the vehicle network for the time being.

[0068] Step 062: If a module arm shoot-through fault is detected in the converter within a preset time, it is considered that the shoot-through fault is caused by the module arm shoot-through; or

[0069] Step 063: If no module arm shoot-through fault is detected in the converter within a preset time, it is considered that the arm shoot-through derivative fault is not caused by module arm shoot-through.

[0070] In summary, when a bridge arm shoot-through fault is detected in any of the four-quadrant rectifier or inverter modules within the converter, the accompanying derivative faults will no longer be reported to the network; only the following fault information will be uploaded to the network:

[0071] Traction converter module arm shoot-through fault

[0072] Module A Component Protection (Note: Reporting Module A Component Protection is to allow the driver and maintenance personnel to locate the module that caused the bridge arm straight-through).

[0073] This embodiment provides a traction converter arm shoot-through fault identification and protection device, such as... Figure 2 As shown, the traction converter includes:

[0074] The first four-quadrant current sensor 5 and the second four-quadrant current sensor 5; the first four-quadrant rectifier module 6 and the second four-quadrant rectifier module 6; the first traction inverter module 8 and the second traction inverter module 8; the first traction inverter current sensor 9 and the second traction inverter current sensor 9; the first four-quadrant current sensor 5, the first four-quadrant rectifier module 6, the first traction inverter module 8 and the first traction inverter current sensor 9 form a first unit; the second four-quadrant current sensor 5, the second four-quadrant rectifier module 6, the second traction inverter module 8 and the second traction inverter current sensor 9 form a second unit; the auxiliary inverter module 10; the auxiliary transformer output current sensor 11; the auxiliary inverter module 10 and the auxiliary transformer output current sensor 11 are connected in series to form a third unit; the first input terminal of the auxiliary inverter module 10 is connected between the first four-quadrant rectifier module 6 and the first traction inverter module 8; the second input terminal of the auxiliary inverter module 10 is connected between the second four-quadrant rectifier module 6 and the second traction inverter module 8.

[0075] Optionally, the first four-quadrant rectifier module 5, the second four-quadrant rectifier module 5, the first traction inverter module 8, the second traction inverter module 8, and the auxiliary inverter module 10 share a common intermediate voltage circuit.

[0076] Optionally, the internal structure of the four-quadrant rectifier module 5 (including the first four-quadrant rectifier module 5 and the second four-quadrant rectifier module 5), the traction inverter module 8 (including the first traction inverter module 8 and the second traction inverter module 8), and the auxiliary inverter module 10 all include: multiple IGBT units, wherein two IGBT units are connected in series to form an upper and lower bridge arm, and multiple upper and lower bridge arms are connected in parallel.

[0077] The four-quadrant rectifier module 6 and the inverter module are both composed of multiple IGBT units. Using the four-quadrant current sensor 5, the traction converter's internal drive control system (TCU) can detect primary and secondary four-quadrant overcurrent faults; using the traction inverter current sensor 9, it can identify overcurrent faults in the primary and secondary traction inverters; using the auxiliary transformer output current sensor 11, the traction converter drive control system can identify overcurrent faults in the auxiliary inverter; when a single IGBT unit fails, it transmits a fault signal to the TCU.

[0078] When multiple IGBT component failures occur within the four-quadrant module 6, traction inverter module 8, and auxiliary inverter module 10, the TCU will receive multiple module failure signals. However, according to the communication protocol between the traction system and the network system, only one module component protection information will be transmitted to the network. For example, if multiple IGBT component failures occur within the primary four-quadrant module, although the TCU will detect multiple four-quadrant IGBT component failures internally, it will only transmit and report the "primary four-quadrant module component protection" fault to the network.

[0079] In one embodiment of the present invention, such as Figure 3 As shown, the four-quadrant rectifier module 6 includes four IGBTs, which are connected in series in pairs and then in parallel.

[0080] In one embodiment of the present invention, such as Figure 4 As shown, the inverter module includes six IGBTs, which are connected in series in pairs and then in parallel.

[0081] In one embodiment of the present invention, the traction converter drive control system further includes: a first winding and a second winding of the traction transformer secondary transformer; the first winding 2 is connected to the input terminal of the first four-quadrant rectifier module 6; and the second winding 2 is connected to the input terminal of the second four-quadrant rectifier module 6.

[0082] In one embodiment of the present invention, the traction converter drive control system further includes: an auxiliary transformer output contactor 12, which is connected to the output terminal of the auxiliary transformer output current sensor 11.

[0083] In one embodiment of the present invention, the traction converter further includes: a first switching unit and a second switching unit; the first switching unit is connected between the first traction transformer 2 and the first four-quadrant rectifier module 6; the second switching unit is connected between the second traction transformer 2 and the second four-quadrant rectifier module 6. The first switching unit includes: a first charging contactor 3 and a second shorting contactor 4; the second switching unit includes: a second charging contactor 3 and a second shorting contactor 4.

[0084] In one embodiment of the present invention, the traction inverter drive control system further includes: an intermediate voltage sensor 7, which is connected in parallel with the first traction inverter module 8.

[0085] In one embodiment of the present invention, the traction converter drive control system further includes a main circuit breaker 1, which is disposed at the input end of the traction converter drive control system.

[0086] This embodiment provides a traction converter arm shoot-through fault identification and protection device 100, such as... Figure 5 As shown, the traction converter arm shoot-through fault identification and protection device 100 includes: a fault detection module 10, a fault judgment module 20, a fault reporting module 30, and a protection control module 40. Specifically, the fault detection module 10 is used to detect whether a fault has occurred inside the converter; the fault judgment module 20 is used to determine whether the fault inside the converter meets the conditions for an arm shoot-through fault when a fault occurs inside the converter, and if the conditions for an arm shoot-through fault are met, then an arm shoot-through fault is determined to have occurred; the fault reporting module 30 is used to report the arm shoot-through fault to the network when an arm shoot-through fault occurs; and the protection control module 40 is used to activate protection measures when an arm shoot-through fault occurs.

[0087] This invention can accurately identify module arm shoot-through faults in traction converter rectifiers or inverters by using module faults, intermediate voltage characteristics, and four-quadrant input overcurrent signals. No additional hardware is required; only software modifications are needed to quickly determine module arm shoot-through faults.

[0088] Furthermore, the traction converter arm shoot-through fault identification and protection device 100 also includes a filter module 50, which is used to filter the arm shoot-through derivative fault when an arm shoot-through derivative fault is detected.

[0089] Furthermore, the judgment module is also used to determine whether the bridge arm straight-through derivative fault is caused by bridge arm straight-through. If so, the fault reporting module 30 will not report the bridge arm straight-through derivative fault to the vehicle network; if not, the fault reporting module 30 will not report the bridge arm straight-through derivative fault to the vehicle network.

[0090] Furthermore, the protection control module 40 is used to disconnect the vehicle's VCB, isolate the inverter charging, and short-circuit the contactor.

[0091] This invention, after identifying a module bridge arm pass-through fault, processes derivative faults arising from the module bridge arm pass-through. Only the corresponding bridge arm pass-through fault and module fault information are sent to the network display. The fault information is simple and clear. When a module bridge arm pass-through fault occurs in the converter, it helps the driver to quickly locate the fault and take timely and accurate corrective measures for the entire vehicle. After identifying a module fault pass-through fault, the traction converter controller directly disconnects the train's main circuit, isolating the converter. The converter with the bridge arm pass-through fault will no longer be put into operation, preventing repeated fault occurrences and affecting train operation.

[0092] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this invention. It will be clearly understood by those skilled in the art that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0093] In the several embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative. For instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the shown or discussed mutual couplings, direct couplings, or communication connections may be through some interfaces; indirect couplings or communication connections between devices or units may be electrical, mechanical, or other forms. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units, i.e., they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0094] The basic principles of this application have been described above with reference to specific embodiments. However, it should be noted that the advantages, benefits, and effects mentioned in this application are merely examples and not limitations, and should not be considered as essential features of each embodiment of this application. Furthermore, the specific details disclosed above are for illustrative and facilitative purposes only, and are not limitations. These details do not limit the application to the necessity of employing the aforementioned specific details for implementation.

[0095] The block diagrams of devices, apparatuses, devices, and systems involved in this application are merely illustrative examples and are not intended to require or imply that they must be connected, arranged, or configured in the manner shown in the block diagrams. As those skilled in the art will recognize, these devices, apparatuses, devices, and systems can be connected, arranged, and configured in any manner.

[0096] It should also be noted that in the apparatus, equipment, and methods of this application, the components or steps can be disassembled and / or recombined. These disassemblies and / or recombinations should be considered as equivalent solutions of this application.

[0097] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use this application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein can be applied to other aspects without departing from the scope of this application. Therefore, this application is not intended to be limited to the aspects shown herein, but rather to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0098] In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified. All directional indications (such as up, down, left, right, front, back, top, bottom, etc.) in the embodiments of this application are only used to explain the relative positional relationships and movement of the components in a specific posture (as shown in the figures). If the specific posture changes, the directional indication will also change accordingly. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or devices.

[0099] Furthermore, the reference to "embodiment" herein means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0100] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims. The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for identifying and protecting against shoot-through faults in a traction converter arm, characterized in that, include: The transmission control system is used to detect whether a fault has occurred inside the converter. If a fault occurs inside the converter, determine whether the fault inside the converter meets the conditions for a bridge arm shoot-through fault. If the conditions for a bridge arm shoot-through fault are met, then a bridge arm shoot-through fault is determined to have occurred. When a bridge arm straight-through fault occurs, it is reported to the network and protection measures are activated; The criteria for determining whether an internal converter fault meets the conditions for a bridge arm shoot-through fault include: the following faults must occur simultaneously to meet the conditions for a bridge arm shoot-through fault: Both the first and second quadrant rectifier modules experienced input overcurrent faults. The intermediate DC voltage is lower than the preset value for bridge arm shoot-through fault protection; The protection against faults of any one of the following modules: the first four-quadrant rectifier module, the second four-quadrant rectifier module, the first traction inverter module, the second traction inverter module, and the auxiliary inverter module. The first input terminal of the auxiliary inverter module is connected between the first four-quadrant rectifier module and the first traction inverter module; the second input terminal of the auxiliary inverter module is connected between the second four-quadrant rectifier module and the second traction inverter module.

2. The method for identifying and protecting traction converter arm shoot-through faults according to claim 1, characterized in that, Also includes: When a bridge arm shoot-through derivative fault is detected, the bridge arm shoot-through derivative fault is filtered. Determine whether the bridge arm shoot-through fault is caused by bridge arm shoot-through. If so, do not report the bridge arm shoot-through fault to the vehicle network. If not, the bridge arm through-through fault will be reported to the vehicle network. The bridge arm shoot-through faults include at least one of the following: input overcurrent of the first four-quadrant rectifier module, input overcurrent of the second four-quadrant rectifier module, output overcurrent of the first traction inverter module, output overcurrent of the second traction inverter module, and overcurrent of the auxiliary inverter module.

3. The method for identifying and protecting traction converter arm shoot-through faults according to claim 2, characterized in that, The determination of whether the bridge arm shoot-through-derived fault is caused by bridge arm shoot-through includes: When a bridge arm through-through fault is detected, the bridge arm through-through fault is filtered for a preset time, and the bridge arm through-through fault is not reported to the vehicle network for the time being. If a module arm shoot-through fault is detected in the converter within a preset time, it is considered that the shoot-through-derived fault is caused by the module arm shoot-through; or If no module arm shoot-through fault is detected in the converter within a preset time, it is considered that the shoot-through fault is not caused by module arm shoot-through.

4. The method for identifying and protecting traction converter arm shoot-through faults according to claim 1, characterized in that, The opening protection measures include at least one of: disconnecting the vehicle VCB, isolating the converter charging, and short-circuiting the contactor.

5. A traction converter arm shoot-through fault identification and protection device, characterized in that, include: A transmission control system, wherein the transmission control system is configured to perform the method as described in any one of claims 1-4; First and second quadrant current sensors; First and second quadrant rectifier modules; First traction inverter module and second traction inverter module; First traction inverter current sensor and second traction inverter current sensor; The first unit consists of a first four-quadrant current sensor, a first four-quadrant rectifier module, a first traction inverter module, and a first traction inverter current sensor; the second unit consists of a second four-quadrant current sensor, a second four-quadrant rectifier module, a second traction inverter module, and a second traction inverter current sensor; the second unit is used to provide the detected fault signal to the drive control system. Auxiliary inverter module; Auxiliary transformer output current sensor; The auxiliary inverter module and the auxiliary inverter output current sensor constitute a third unit; the third unit is used to provide the detected fault signal to the drive control system. The first input terminal of the auxiliary inverter module is connected between the first four-quadrant rectifier module and the first traction inverter module; the second input terminal of the auxiliary inverter module is connected between the second four-quadrant rectifier module and the second traction inverter module.

6. The traction converter arm shoot-through fault identification and protection device according to claim 5, characterized in that, Also includes: An intermediate voltage sensor is connected in parallel with the first traction inverter module.

7. The traction converter arm shoot-through fault identification and protection device according to claim 5, characterized in that, The first four-quadrant rectifier module, the second four-quadrant rectifier module, the first traction inverter module, the second traction inverter module, and the auxiliary inverter module share a common intermediate voltage circuit.

8. The traction converter arm shoot-through fault identification and protection device according to claim 5, characterized in that, The internal structure of the first four-quadrant rectifier module, the second four-quadrant rectifier module, the first traction inverter module, the second traction inverter module, and the auxiliary inverter module all includes: multiple IGBT units, wherein two IGBT units are connected in series to form an upper and lower bridge arm, and multiple upper and lower bridge arms are connected in parallel.

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