Bridge arm shoot-through protection method, device and electronic equipment for locomotive traction converter

Abstract

The present application provides a kind of locomotive traction converter bridge arm through protection method, device and electronic equipment.The method comprises: monitoring the characteristic current of the input or output of the measured circuit unit;In response to receiving the fault signal characterizing the overcurrent phenomenon of the characteristic current, determine the bridge arm in which the overcurrent phenomenon occurs in the measured circuit unit, and obtain the current value of the characteristic current and the current voltage value of the intermediate capacitor of traction converter;According to the bridge arm that appears overcurrent phenomenon, the current value and the voltage value, and the preset reference voltage and reference current, determine the target IGBT device that short-circuit fault occurs;According to the target IGBT device, control other IGBT devices that are upper tube or lower tube with the target IGBT device to open, to prevent bridge arm through.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of power electronics, and in particular to a locomotive traction converter bridge arm shoot-through protection method and device and electronic equipment. BACKGROUND

[0002] With the development of rail transit and high-speed rail, train safety, vehicle product reliability and availability are increasingly valued. As is known to all, a high-power traction converter, as the core of an electric locomotive, is responsible for the mutual conversion and transmission between electric energy and mechanical energy, in which an IGBT semiconductor device (IGBT, Insulated Gate Bipolar Transistor) as the core of the converter serves as a switching device to play a role in the conversion of electric energy. Although the reliability of IGBT devices is increasingly high with the development and upgrading of technology, there is still a certain failure rate. After the failure of an IGBT device, it will be in a short-circuit state, and the accumulation of heat is likely to cause device explosion and arc discharge, which further causes the failure of other devices in the same bridge arm, resulting in bridge arm shoot-through explosion. SUMMARY

[0003] In view of the above, the purpose of the present application is to provide a locomotive traction converter bridge arm shoot-through protection method, device and electronic equipment.

[0004] To achieve the above purpose, the present application provides a locomotive traction converter bridge arm shoot-through protection method, which comprises:

[0005] monitoring a characteristic current input or output by a measured circuit unit;

[0006] in response to receiving a fault signal representing an overcurrent phenomenon of the characteristic current, determining a bridge arm in which the overcurrent phenomenon occurs in the measured circuit unit, and obtaining a current value of the characteristic current and a voltage value of an intermediate capacitor of the traction converter at present;

[0007] determining a target IGBT device in which a short-circuit fault occurs according to the bridge arm in which the overcurrent phenomenon occurs, the current value and the voltage value, and a preset reference voltage and reference current;

[0008] controlling other IGBT devices which are upper or lower tubes together with the target IGBT device to be turned on according to the target IGBT device, so as to prevent bridge arm shoot-through.

[0009] In some embodiments, the measured circuit unit is a four-quadrant rectification unit or an inverter unit.

[0010] In some embodiments, the circuit unit under test is a four-quadrant rectifier unit; the four-quadrant rectifier unit comprises a first bridge arm and a second bridge arm; the first bridge arm and the second bridge arm each comprises two groups of IGBT devices corresponding to upper and lower IGBT devices in series respectively; each of the groups of IGBT devices comprises a plurality of IGBT devices in parallel;

[0011] The reference current comprises a positive reference current and a negative reference current;

[0012] The target IGBT device of the short circuit fault is determined according to the bridge arm in which the overcurrent phenomenon occurs, the current value and the voltage value, and preset reference voltage and reference current, and specifically comprises:

[0013] In response to determining that the voltage value is greater than the reference voltage, it is determined that a single IGBT device fails and bridge arm shoot-through does not occur, and further performing any one of the following:

[0014] In response to determining that the overcurrent phenomenon occurs in the first bridge arm and the current value is greater than the positive reference current, it is determined that the lower IGBT device of the first bridge arm is the target IGBT device;

[0015] In response to determining that the overcurrent phenomenon occurs in the first bridge arm and the current value is less than the negative reference current, it is determined that the upper IGBT device of the first bridge arm is the target IGBT device;

[0016] In response to determining that the overcurrent phenomenon occurs in the second bridge arm and the current value is greater than the positive reference current, it is determined that the upper IGBT device of the second bridge arm is the target IGBT device;

[0017] In response to determining that the overcurrent phenomenon occurs in the second bridge arm and the current value is less than the negative reference current, it is determined that the lower IGBT device of the second bridge arm is the target IGBT device.

[0018] In some embodiments, the control of other IGBT devices which are upper or lower IGBT devices together with the target IGBT device according to the target IGBT device specifically comprises:

[0019] In response to determining that the lower IGBT device of the first bridge arm is the target IGBT device, at least part of the IGBT devices of the lower IGBT device of the second bridge arm are controlled to be turned on;

[0020] In response to determining that the upper IGBT device of the first bridge arm is the target IGBT device, at least part of the IGBT devices of the upper IGBT device of the second bridge arm are controlled to be turned on;

[0021] In response to determining that the upper IGBT device of the second bridge arm is the target IGBT device, at least part of the IGBT devices of the upper IGBT device of the first bridge arm are controlled to be turned on;

[0022] in response to determining that the lower arm of the second bridge arm is the target IGBT device, controlling at least part of the IGBT devices of the lower arm of the first bridge arm to turn on.

[0023] In some embodiments, the controlling other IGBT devices which are upper arms or lower arms with the target IGBT device to turn on according to the target IGBT device specifically includes:

[0024] controlling other IGBT devices which are in the same IGBT device group with the target IGBT device to turn on according to the target IGBT device.

[0025] In some embodiments, the obtaining the current value of the characteristic current and the voltage value of the intermediate capacitor of the traction converter specifically includes:

[0026] obtaining the current value through a current sensor on an input line or an output line of the measured circuit unit;

[0027] obtaining the voltage value through a voltage sensor connected to the intermediate capacitor.

[0028] In some embodiments, the controlling other IGBT devices which are upper arms or lower arms with the target IGBT device to turn on further includes:

[0029] blocking the driving signal transmitted to the measured circuit unit.

[0030] In some embodiments, the controlling other IGBT devices which are upper arms or lower arms with the target IGBT device to turn on further includes:

[0031] in response to determining that the high-voltage circuit breaker of the traction converter completes breaking, blocking the driving signal transmitted to the measured circuit unit and controlling all the IGBT devices to return to the normal working state.

[0032] Based on the same inventive concept, the present application also provides a bridge arm direct-through protection device of a locomotive traction converter, comprising:

[0033] a monitoring module configured to monitor a characteristic current input or output by a measured circuit unit;

[0034] an obtaining module configured to, in response to receiving a fault signal representing an overcurrent phenomenon of the characteristic current, determine a bridge arm in which the overcurrent phenomenon occurs in the measured circuit unit, and obtain a current value of the characteristic current and a voltage value of an intermediate capacitor of a traction converter;

[0035] The determining module is configured to determine a target IGBT device that has a short circuit fault according to the bridge arm in which the overcurrent phenomenon occurs, the current value and the voltage value, and preset reference voltage and reference current.

[0036] The executing module is configured to control other IGBT devices that are upper or lower devices of the target IGBT device to be turned on according to the target IGBT device, so as to prevent the bridge arm from being directly passed through.

[0037] Based on the same inventive concept, the application further provides an electronic device comprising a memory, a processor, and a computer program stored in the memory and capable of running on the processor, and the processor implements the method according to any one of the above embodiments when executing the program.

[0038] As can be seen from the above, the method, device and electronic device for protecting the bridge arm directly passed through of the locomotive traction converter provided by the application can determine a target IGBT device that has a short circuit fault according to the current value of the characteristic current and the voltage value of the intermediate capacitor when the current input or output by the measured circuit unit appears overcurrent, and turn on other IGBT devices that are upper or lower devices of the target IGBT device based on the determined target IGBT device, so as to limit the explosion of the device or the explosion of the bridge arm directly passed through caused by the overcurrent of the target IGBT device that has a fault. BRIEF DESCRIPTION OF DRAWINGS

[0039] In order to more clearly illustrate the technical solutions in the application or the related art, the following will briefly introduce the drawings needed to be used in the embodiments or the related art descriptions. Obviously, the drawings in the following description are only embodiments of the application, and for those skilled in the art, other drawings can also be obtained without creative labor based on these drawings.

[0040] Figure 1 The structure schematic diagram of the traction converter to which the method of the embodiment of the application is applied;

[0041] Figure 2 The flowchart of the bridge arm directly passed through protection method of the locomotive traction converter of the embodiment of the application;

[0042] Figure 3 The structure schematic diagram of the bridge arm directly passed through protection device of the locomotive traction converter of the embodiment of the application;

[0043] Figure 4 The structure schematic diagram of the electronic device of the embodiment of the application. DETAILED DESCRIPTION

[0044] In order to make the objects, technical solutions and advantages of the present application clearer, the following further describes the present application in detail with reference to the embodiments and the accompanying drawings.

[0045] It should be noted that, unless otherwise defined, technical terms or scientific terms used in the embodiments of the present application should be understood as their common meanings to those skilled in the art to which the present application pertains. The terms "first", "second" and similar terms used in the embodiments of the present application do not denote any order, quantity or importance, but are only used to distinguish different components. The terms "comprise", "include" and similar terms mean that the elements or objects before the terms encompass the elements or objects listed after the terms and their equivalents, and do not exclude other elements or objects. The terms "connect" or "connected" and similar terms do not mean only physical or mechanical connections, but can include electrical connections, whether direct or indirect. The terms "upper", "lower", "left", "right" and the like are only used to indicate relative positional relationships, and when the absolute positions of the described objects are changed, the relative positional relationships can also be changed accordingly.

[0046] As described in the background section, the IGBT device in a short-circuit state after failure is prone to explosion, which further causes a bridge arm shoot-through explosion. In a traction inverter, although a main circuit breaker (High Voltage Circuit Breaker, HVB) is arranged in an energy transmission path to play a protective role, the main circuit breaker cannot be immediately disconnected due to its inherent mechanical disconnection time (which requires tens to hundreds of microseconds). During the above-mentioned inherent mechanical disconnection time, energy will flow through the failed short-circuit device to form an overcurrent. When the excessive current flows through the device, the accumulation of heat will cause the device to explode and arc discharge, which will further cause other devices in the bridge arm to fail, resulting in a bridge arm shoot-through short circuit. At the same time, since the intermediate circuit supporting capacitor (also referred to as an intermediate capacitor) stores a huge amount of energy, it will be rapidly released in the bridge arm shoot-through circuit, resulting in serious explosion and impact. In the prior art, there are some schemes for IGBT device short-circuit protection, such as short-circuit drive board protection or inverter overcurrent control unit detection implementation pulse blocking protection, but these schemes can only perform protection when the IGBT device is in a normal state and a control command can be executed. When the IGBT device in the traction inverter is in a failed short-circuit state, protection and suppression cannot be performed.

[0047] To solve the above problems, the embodiment of the present application provides a locomotive traction converter bridge arm through protection method, device and electronic equipment. When overcurrent of input or output current of a measured circuit unit is determined, a target IGBT device of short circuit failure is determined by current value of a characteristic current and voltage value of an intermediate capacitor, and other IGBT devices which are upper or lower tubes with the target IGBT device are turned on based on the determined target IGBT device, so as to limit device explosion or bridge arm through explosion caused by overcurrent of the target IGBT device of failure.

[0048] The scheme of the present application is further described in detail through specific embodiments.

[0049] Firstly, the embodiment of the present application provides a bridge arm through protection method of a locomotive traction converter. Referring to Figure 1 , a structure schematic diagram of the traction converter to which the method of the embodiment is applied. The components mainly involved in the method of the embodiment include a control unit, a pulse distribution and fault processing unit, an IGBT driving unit and a measured circuit unit. The control unit is a logic processing component of the traction converter, and mainly realizes logic judgment on voltage signals, current signals and fault signals and sends corresponding control instructions. The pulse distribution and fault processing unit is used for receiving the signal processed by the control unit and sending to the driving unit to control the turning on and turning off of the IGBT device, and receiving the fault signal fed back by the driving unit and sending the fault signal to the control unit. The driving unit, as shown in driving 1 to driving 10 in Figure 1 , can generate driving signals for driving the IGBT device under the control of the pulse distribution and fault processing unit, and correspondingly transmit to the corresponding IGBT device. The measured circuit unit is composed of IGBT devices, and is the object monitored and protected by the method of the embodiment, and can be a four-quadrant rectifier unit or an inverter unit. In the following embodiment, based on the hardware structure of the traction converter, the measured circuit unit is taken as a four-quadrant rectifier unit as an example for specific description.

[0050] Based on the hardware structure of the traction converter, referring to Figure 2 , the bridge arm through protection method of the locomotive traction converter comprises the following steps:

[0051] Step S201, monitoring the characteristic current input or output by the measured circuit unit.

[0052] In the embodiment, whether the IGBT device in the measured circuit unit has short circuit failure is judged by monitoring the characteristic current input or output by the measured circuit unit. Specifically, referring to Figure 1For the four-quadrant rectifier unit, the monitoring of the characteristic current of the four-quadrant rectifier unit can be achieved by monitoring the sensor signal of the current sensor on the input line of the four-quadrant rectifier unit.

[0053] In step S202, in response to receiving the fault signal representing that the overcurrent phenomenon occurs in the input current, a bridge arm in which the overcurrent phenomenon occurs in the measured circuit unit is determined, and the current value of the input current at present and the voltage value of the intermediate capacitor of the traction converter at present are obtained.

[0054] In the embodiment, the four-quadrant rectifier unit comprises a first bridge arm and a second bridge arm; referring to Figure 1 , the series path on the left side is the first bridge arm, and the series path on the right side is the second bridge arm. The first bridge arm and the second bridge arm each comprise a series of two IGBT device groups corresponding to upper and lower tubes respectively; specifically, the first bridge arm comprises two IGBT device groups S1 and S2, and the second bridge arm comprises two IGBT device groups S3 and S4; wherein S1 and S3 are upper tubes, and S2 and S4 are lower tubes, and each IGBT device group comprises a plurality of parallel IGBT devices.

[0055] In specific implementation, in the working process of the four-quadrant rectifier unit, the voltage signals and current signals of the input and output thereof are detected and saved in real time by the corresponding driving unit. The driving unit has a fault feedback function, and when an IGBT device in the four-quadrant rectifier unit fails, the driving unit will feed back the fault information to the pulse distribution and fault processing unit according to the change of the detected voltage signals and current signals, and make logical judgment to generate and send a fault signal to the control unit.

[0056] In the embodiment, when an IGBT device in the four-quadrant rectifier unit fails, the driving unit detects the fault and feeds back the fault information to the pulse distribution and fault processing unit. At the same time, due to the short-circuit failure of the IGBT device, the current sensor on the input line of the four-quadrant rectifier unit will detect an overcurrent phenomenon. In response to receiving the fault signal, the control unit will control the pulse distribution and fault processing unit to lock all input driving signals of the four-quadrant rectifier unit. Then, the control unit judges whether to perform specific protection processing, that is, whether to enter the anti-bridge arm through protection mode in the embodiment.

[0057] In specific implementation, the control unit obtains the input current of the four-quadrant rectifier unit as the characteristic current, and specifically, the current value of the characteristic current can be obtained by obtaining the sensor signal of the current sensor on the input line of the four-quadrant rectifier unit, that is, the current value A1 in Figure 1 . At the same time, referring to Figure 1 , the control unit also obtains the voltage value V1 of the intermediate capacitor C DC at present. Specifically, the voltage value V1 of the intermediate capacitor C DC at present can be obtained by obtaining the voltage signal of the intermediate capacitor C DC .DC The voltage sensor signal of the connected voltage sensor is acquired to obtain a voltage value V1.

[0058] In step S203, the target IGBT device that has a short-circuit fault is determined according to the bridge arm in which the overcurrent phenomenon occurs, the current value and the voltage value, and preset reference voltage and reference current.

[0059] In this embodiment, after receiving the fault signal, the control unit performs logical judgment according to the bridge arm in which the overcurrent phenomenon occurs indicated by the fault signal and the current value A1 and the voltage value V1 obtained in the foregoing steps, and determines whether to enter the anti-bridge-arm-through protection mode according to the result of the logical judgment.

[0060] In this embodiment, the specific logical judgment process is as follows:

[0061] First, the voltage value V1 of the intermediate capacitor is compared with the preset reference voltage V ref in the traction inverter. If V1>V ref , it is determined that the IGBT device single tube fails without bridge-arm-through. Then, the current value A1 is further compared with the preset reference current (including the positive reference current I ref+ and the negative reference current I ref- ) in the traction inverter, and the IGBT device that has a short-circuit fault is determined according to the comparison result. In this embodiment, the foregoing IGBT device that has a short-circuit fault is referred to as a target IGBT device.

[0062] Specifically, in response to determining that the first bridge arm is the bridge arm in which the overcurrent phenomenon occurs and A1>I ref+ , it is determined that the lower tube S2 of the first bridge arm is the target IGBT device; in response to determining that the first bridge arm is the bridge arm in which the overcurrent phenomenon occurs and A1<I ref- , it is determined that the upper tube S1 of the first bridge arm is the target IGBT device; in response to determining that the second bridge arm is the bridge arm in which the overcurrent phenomenon occurs and A1>I ref+ , it is determined that the upper tube S3 of the second bridge arm is the target IGBT device; in response to determining that the second bridge arm is the bridge arm in which the overcurrent phenomenon occurs and A1<I ref- , it is determined that the lower tube S4 of the second bridge arm is the target IGBT device.

[0063] The specific values of the reference voltage and the reference current can be set according to the specific circuit unit (four-quadrant rectification unit or inversion unit) to be measured and the specific application scenario of the traction inverter.

[0064] After the target IGBT device that has a short-circuit fault is determined, the control unit controls to enter the anti-bridge-arm-through protection mode.

[0065] Step S204, according to the target IGBT device, control the other IGBT devices which are the same as the target IGBT device in the upper or lower tube to turn on, to prevent the bridge arm shoot-through.

[0066] In this embodiment, the control unit controls to enter the anti-bridge arm shoot-through protection mode, and specifically controls the driving unit to issue a driving signal to turn on the other normal IGBT devices which are the same as the target IGBT device in the upper or lower tube and fail due to the short circuit fault. After the normal IGBT devices are turned on, the overcurrent flowing through the failed target IGBT device can be effectively limited, so as to prevent further triggering of the bridge arm shoot-through or even module explosion.

[0067] Specifically, in response to determining that the lower tube S2 of the first bridge arm is the target IGBT device, all or part of the IGBT devices of the lower tube S4 of the second bridge arm are controlled to turn on; in response to determining that the lower tube S1 of the first bridge arm is the target IGBT device, all or part of the IGBT devices of the upper tube S3 of the second bridge arm are controlled to turn on; in response to determining that the upper tube S3 of the second bridge arm is the target IGBT device, all or part of the IGBT devices of the upper tube S1 of the first bridge arm are controlled to turn on; in response to determining that the lower tube S4 of the second bridge arm is the target IGBT device, all or part of the IGBT devices of the lower tube S2 of the first bridge arm are controlled to turn on.

[0068] In this embodiment, to further limit the effect of overcurrent, for the target IGBT device which fails due to the short circuit fault, in addition to turning on the other normal IGBT devices which are in the same bridge arm and the same upper or lower tube, the other IGBT devices which are in the same IGBT device group as the target IGBT device are also turned on.

[0069] To more clearly show the logic judgment and corresponding execution mode of the foregoing step S203 and step S204, the following table can be specifically referred to:

[0070] Table 1 Anti-bridge arm shoot-through protection mode logic processing

[0071]

[0072] Reference Figure 1 The anti-bridge arm shoot-through protection mode of the embodiment works in the inherent mechanical breaking time of the main circuit breaker HVB, and can play an effective short circuit protection role when the main circuit breaker HVB has not realized breaking. Specifically, after the main circuit breaker HVB completes the breaking action, a circuit breaker state signal K is sent to the control unit. After the control unit receives the circuit breaker state signal K, the driving signal transmitted to the four-quadrant rectifier unit is blocked, and the anti-bridge arm shoot-through protection mode is controlled to be pushed out, that is, all the IGBT devices return to the normal working state.

[0073] As another optional embodiment, reference Figure 1The measured circuit unit is an inverter unit. The inverter unit includes three bridge arms, each of which includes two IGBT devices connected in series and corresponding to upper and lower tubes respectively, specifically as shown in Figure 1 S5, S7 and S9 are upper tubes, and S6, S8 and S10 are lower tubes. The inverter unit is connected to the traction motor through three-phase lead-out lines, and correspondingly, when the characteristic current of the inverter unit is obtained, it is specifically obtained by collecting three current sensors respectively arranged on the three three-phase lead-out lines, as shown in Figure 1 , that is, current sensor signals A2, A3 and A4.

[0074] For the specific implementation of the protection method of the bridge arm through of the inverter unit, reference can be made to the foregoing embodiments of the four-quadrant rectifier unit, and the contents of the logical judgment and the corresponding execution mode are similar, which will not be described in detail in this embodiment. For example, when it is determined according to the fault information that the IGBT device S5 is the target IGBT device that appears short-circuit fault failure, the anti-bridge arm through protection mode is entered, and the IGBT devices S7 and S9 are turned on to prevent the bridge arm through.

[0075] It can be seen that the bridge arm through protection method of the locomotive traction converter in this embodiment can quickly respond to faults after monitoring that a single IGBT device has a short-circuit fault failure, enter the anti-bridge arm through protection mode, quickly locate the position of the faulty IGBT device according to the logical processing rules of the anti-bridge arm through protection mode, and effectively limit the overcurrent flowing through the target IGBT device that has a short-circuit fault within the time from the occurrence of the fault to the disconnection of the main circuit breaker on the grid side, prevent the IGBT device from exploding and arcing after failure, and prevent the bridge arm through short-circuit explosion.

[0076] It should be noted that some embodiments of the present application have been described above. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recited in the claims can be performed in an order different than that described in the above embodiments and still achieve desirable results. In addition, the processes depicted in the figures do not necessarily require the particular order shown or sequential order to achieve desirable results. In certain implementations, multitasking and parallel processing can be advantageous or possible.

[0077] Based on the same inventive concept, the present application also provides a bridge arm through protection device of a locomotive traction converter corresponding to any of the above-mentioned embodiment methods.

[0078] Referring to Figure 3 , the bridge arm through protection device of the locomotive traction converter includes:

[0079] The monitoring module 301 is configured to monitor a characteristic current input or output by the circuit unit under test;

[0080] The acquisition module 302 is configured to, in response to receiving a fault signal representing that the characteristic current has an overcurrent phenomenon, determine a bridge arm in which the overcurrent phenomenon occurs in the circuit unit under test, and acquire a current value of the characteristic current and a voltage value of an intermediate capacitor of the traction converter at present;

[0081] The determination module 303 is configured to determine a target IGBT device that has a short-circuit fault according to the bridge arm in which the overcurrent phenomenon occurs, the current value and the voltage value, and preset reference voltage and reference current.

[0082] The execution module 304 is configured to control other IGBT devices that are upper or lower tubes together with the target IGBT device to be turned on according to the target IGBT device, so as to prevent bridge arm shoot-through.

[0083] For the convenience of description, the above apparatus is described in various modules according to functions. Of course, the functions of the modules can be implemented in one or more software and / or hardware when the present application is implemented.

[0084] The apparatus of the above embodiment is used to implement the bridge arm shoot-through protection method of the traction converter of the locomotive in any of the above embodiments, and has the beneficial effects of the corresponding method embodiments, which will not be described here.

[0085] Based on the same inventive concept, the present application also provides an electronic device corresponding to the method of any of the above embodiments, which comprises a memory, a processor and a computer program stored in the memory and executable on the processor, and the processor implements the bridge arm shoot-through protection method of the traction converter of the locomotive according to any of the above embodiments when executing the program.

[0086] Figure 4 A more specific hardware structure of an electronic device provided by the present embodiment is shown, which can include a processor 1010, a memory 1020, an input / output interface 1030, a communication interface 1040 and a bus 1050. The processor 1010, the memory 1020, the input / output interface 1030 and the communication interface 1040 are connected to each other through the bus 1050 for communication within the device.

[0087] The processor 1010 can be implemented by a general-purpose CPU (Central Processing Unit), a microprocessor, an ASIC (Application Specific Integrated Circuit), or one or more integrated circuits, etc., for executing relevant programs to implement the technical solutions provided by the embodiments of the present specification.

[0088] The memory 1020 can be implemented by a ROM (Read Only Memory), a RAM (Random Access Memory), a static storage device, a dynamic storage device, etc. The memory 1020 can store an operating system and other application programs, and when the technical solutions provided by the embodiments of the present specification are implemented by software or firmware, the relevant program codes are stored in the memory 1020 and called and executed by the processor 1010.

[0089] The input / output interface 1030 is configured to connect input / output modules to implement information input and output. The input / output modules can be configured as components in the device (not shown in the figure) or externally connected to the device to provide corresponding functions. The input devices can include a keyboard, a mouse, a touch screen, a microphone, various sensors, etc., and the output devices can include a display, a speaker, a vibrator, an indicator light, etc.

[0090] The communication interface 1040 is configured to connect a communication module (not shown in the figure) to implement the communication interaction between the device and other devices. The communication module can realize communication through a wired manner (such as USB, network cable, etc.) or through a wireless manner (such as mobile network, WIFI, Bluetooth, etc.).

[0091] The bus 1050 includes a channel for transmitting information between various components (such as the processor 1010, the memory 1020, the input / output interface 1030, and the communication interface 1040) of the device.

[0092] It should be noted that although the above device only shows the processor 1010, the memory 1020, the input / output interface 1030, the communication interface 1040, and the bus 1050, in the specific implementation process, the device can also include other components necessary for normal operation. In addition, those skilled in the art can understand that the above device can also only include the components necessary to implement the solutions of the embodiments of the present specification, and does not have to include all the components shown in the figure.

[0093] The electronic device of the above embodiment is used to implement the bridge arm shoot-through protection method of the corresponding locomotive traction converter in any of the foregoing embodiments, and has the beneficial effects of the corresponding method embodiment, which will not be described here again.

[0094] Those skilled in the art should understand that the discussion of any embodiment above is merely exemplary and is not intended to suggest that the scope of the application (including the claims) is limited to these examples; under the concept of the application, the above embodiments or technical features between different embodiments can also be combined, the steps can be implemented in any order, and there are many other changes of different aspects of the embodiments of the application as described above, which are not provided in details for the sake of brevity.

[0095] The embodiments of the application are intended to cover all such alternatives, modifications, and variations as fall within the broad scope of the appended claims. Accordingly, any one of the above-mentioned alternatives, modifications, equivalents, improvements, etc. made within the spirit and principle of the embodiments of the application should be included in the scope of the protection of the application.

Claims

1. A method for protecting a bridge arm shoot-through of a locomotive traction converter, characterized in that, The method comprises the following steps: monitoring a characteristic current of an input or output of a circuit unit under test; in response to receiving a fault signal indicating that an overcurrent phenomenon occurs in the characteristic current, determining a bridge arm in which the overcurrent phenomenon occurs in the circuit unit under test, and obtaining a current value of the characteristic current and a voltage value of an intermediate capacitor of a traction converter; determining a target IGBT device in which a short-circuit fault occurs according to the bridge arm in which the overcurrent phenomenon occurs, the current value and the voltage value, and preset reference voltage and reference current; controlling other IGBT devices which are upper or lower tubes together with the target IGBT device to be turned on according to the target IGBT device, so as to prevent bridge arm shoot-through; in the case that the circuit unit under test is a four-quadrant rectification unit, the four-quadrant rectification unit comprises a first bridge arm and a second bridge arm, the first bridge arm and the second bridge arm each comprise two groups of IGBT devices corresponding to upper and lower tubes respectively and connected in series, each of the groups of IGBT devices comprises a plurality of IGBT devices connected in parallel, the reference current comprises positive reference current and negative reference current, and the determination of the target IGBT device in which the short-circuit fault occurs according to the bridge arm in which the overcurrent phenomenon occurs, the current value and the voltage value, and the preset reference voltage and reference current specifically comprises: in response to determining that the voltage value is greater than the reference voltage, determining that a single IGBT device fails and bridge arm shoot-through does not occur, and further performing any one of the following: in response to determining that the overcurrent phenomenon occurs in the first bridge arm and the current value is greater than the positive reference current, determining that the lower tube of the first bridge arm is the target IGBT device; in response to determining that the overcurrent phenomenon occurs in the first bridge arm and the current value is less than the negative reference current, determining that the upper tube of the first bridge arm is the target IGBT device; in response to determining that the overcurrent phenomenon occurs in the second bridge arm and the current value is greater than the positive reference current, determining that the upper tube of the second bridge arm is the target IGBT device; and in response to determining that the overcurrent phenomenon occurs in the second bridge arm and the current value is less than the negative reference current, determining that the lower tube of the second bridge arm is the target IGBT device.

2. The method of claim 1, wherein, The circuit unit under test can also be an inverter unit.

3. The method of claim 1, wherein, The control of other IGBT devices which are upper or lower tubes together with the target IGBT device to be turned on according to the target IGBT device specifically comprises: in response to determining that the lower tube of the first bridge arm is the target IGBT device, controlling at least part of the IGBT devices of the lower tube of the second bridge arm to be turned on; in response to determining that the upper tube of the first bridge arm is the target IGBT device, controlling at least part of the IGBT devices of the upper tube of the second bridge arm to be turned on; in response to determining that the upper tube of the second bridge arm is the target IGBT device, controlling at least part of the IGBT devices of the upper tube of the first bridge arm to be turned on; in response to determining that the lower tube of the second bridge arm is the target IGBT device, controlling at least part of the IGBT devices of the lower tube of the first bridge arm to be turned on.

4. The method of claim 3, wherein, The controlling other IGBT devices which are upper or lower tubes with the target IGBT device to turn on according to the target IGBT device, specifically includes: The controlling other IGBT devices which belong to one IGBT device group with the target IGBT device to turn on according to the target IGBT device.

5. The method of claim 1, wherein, The obtaining the current current value of the characteristic current and the current voltage value of the intermediate capacitor of the traction converter, specifically includes: The obtaining the current value through the current sensor on the input line or the output line of the measured circuit unit; The obtaining the voltage value through the voltage sensor connected with the intermediate capacitor.

6. The method of claim 1, wherein, The response to the fault signal representing that the overcurrent phenomenon occurs in the characteristic current, and then further includes: Blocking the driving signal transmitted to the measured circuit unit.

7. The method of claim 1, wherein, The controlling other IGBT devices which are upper or lower tubes with the target IGBT device to turn on, and then further includes: In response to determining that the high-voltage circuit breaker of the traction converter completes the breaking, blocking the driving signal transmitted to the measured circuit unit, and controlling all the IGBT devices to restore the normal working state.

8. A bridge arm shoot-through protection device for a locomotive traction converter, characterized by, It includes: The monitoring module is configured to monitor the characteristic current input or output by the measured circuit unit; The obtaining module is configured to determine the bridge arm in which the overcurrent phenomenon occurs in the measured circuit unit in response to receiving the fault signal representing that the overcurrent phenomenon occurs in the characteristic current, and to obtain the current current value of the characteristic current and the current voltage value of the intermediate capacitor of the traction converter; The determining module is configured to determine the target IGBT device in which the short circuit fault occurs according to the bridge arm in which the overcurrent phenomenon occurs, the current value and the voltage value, and the preset reference voltage and reference current. In the case that the circuit unit to be tested is a four-quadrant rectifier unit, the four-quadrant rectifier unit comprises a first bridge arm and a second bridge arm; the first bridge arm and the second bridge arm each comprise two groups of IGBT devices corresponding to upper and lower IGBT devices in series; each of the groups of IGBT devices comprises a plurality of IGBT devices in parallel; the reference current comprises a positive reference current and a negative reference current; the target IGBT device of the short-circuit fault is determined according to the bridge arm in which the overcurrent phenomenon occurs, the current value and the voltage value, and the preset reference voltage and reference current, and specifically comprises: in response to determining that the voltage value is greater than the reference voltage, determining that a single IGBT device fails and bridge arm shoot-through does not occur, and further performing any one of the following: in response to determining that the overcurrent phenomenon occurs in the first bridge arm and the current value is greater than the positive reference current, determining that the lower IGBT device of the first bridge arm is the target IGBT device; in response to determining that the overcurrent phenomenon occurs in the first bridge arm and the current value is less than the negative reference current, determining that the upper IGBT device of the first bridge arm is the target IGBT device; in response to determining that the overcurrent phenomenon occurs in the second bridge arm and the current value is greater than the positive reference current, determining that the upper IGBT device of the second bridge arm is the target IGBT device; in response to determining that the overcurrent phenomenon occurs in the second bridge arm and the current value is less than the negative reference current, determining that the lower IGBT device of the second bridge arm is the target IGBT device; The execution module is configured to control other IGBT devices which are the upper or lower IGBT devices of the target IGBT device to be turned on according to the target IGBT device, so as to prevent bridge arm shoot-through.

9. An electronic device comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, characterized in that, The processor executes the program to implement the method of any one of claims 1 to 7.

Images