Method and device for controlling main contactor of traction converter

Abstract

The invention relates to the technical field of high-power traction converters, in particular to a control method and device for a main contactor of a traction converter, and the method comprises the steps: obtaining a current intermediate voltage rising slope of the traction converter when a closing instruction of the main contactor of the traction converter is received; if the current intermediate voltage rising slope is smaller than the preset intermediate voltage rising slope, the pull-in current of the main contactor is increased through a current increasing auxiliary assembly, so that the main contactor is prevented from having a clamping fault; wherein the current increasing auxiliary assembly is integrated in the main contactor.

Description

Technical Field

[0001] The present disclosure relates to the technical field of high-power traction converters, and in particular to a control method and device for a main contactor of a traction converter. Background Art

[0002] Traction converters are widely used in traction transmission fields such as electric locomotives and EMUs. Their input usually uses a main contactor to switch on and off the power supply. During the operation of the electric locomotive, if the main contactor fails, the electric locomotive will lose the corresponding power, affecting the driving. Summary of the invention

[0003] The present disclosure provides a control method and device for a main contactor of a traction converter to solve the problems existing in the related art.

[0004] In a first aspect, the present disclosure provides a method for controlling a main contactor of a traction converter, comprising:

[0005] Upon receiving a closing instruction of a main contactor of a traction converter, obtaining a current rising slope of an intermediate voltage of the traction converter;

[0006] If the current intermediate voltage rising slope is less than the preset intermediate voltage rising slope, the current increasing auxiliary component is used to increase the pull-in current of the main contactor to avoid a stuck fault of the main contactor; wherein the current increasing auxiliary component is integrated in the main contactor.

[0007] In some embodiments, the current increasing auxiliary component includes at least a set of auxiliary control contacts and a boost capacitor.

[0008] In some embodiments, when the current increase auxiliary component is in a non-working state, the coil resistance in the main contactor is connected in parallel with the boost capacitor through the set of auxiliary control contacts; when the current increase auxiliary component is in a working state, the coil resistance is connected in series with the boost capacitor through the set of auxiliary control contacts.

[0009] In some embodiments, obtaining the current intermediate voltage rising slope of the traction converter includes:

[0010] collecting a current intermediate DC voltage of the traction converter and a historical intermediate DC voltage before a preset time period;

[0011] Calculating a rising slope of an intermediate voltage of the traction converter by using the current intermediate DC voltage and the historical intermediate DC voltage;

[0012] If the change rate of the intermediate voltage rising slope is less than the preset change rate, it is determined that the intermediate voltage rising slope is the current intermediate voltage rising slope of the traction converter.

[0013] In some embodiments, the method further comprises:

[0014] Acquiring an updated current intermediate voltage rising slope of the traction converter;

[0015] If the updated current intermediate voltage rising slope is less than the preset intermediate voltage rising slope, the current increasing auxiliary component is controlled to be in a working state.

[0016] In some embodiments, the method further comprises:

[0017] If the updated current intermediate voltage rising slope is greater than or equal to the preset intermediate voltage rising slope, the current increasing auxiliary component is controlled to be in a non-working state.

[0018] In a second aspect, the present disclosure provides a control device for a main contactor of a traction converter, comprising:

[0019] An acquisition module, configured to acquire a current rising slope of an intermediate voltage of the traction converter upon receiving a closing instruction of a main contactor of the traction converter;

[0020] A control module is used to increase the pull-in current of the main contactor by using a current increasing auxiliary component if the current intermediate voltage rising slope is less than the preset intermediate voltage rising slope, so as to avoid a stuck fault of the main contactor; wherein the current increasing auxiliary component is integrated in the main contactor.

[0021] In a third aspect, the present disclosure provides a computer device, including a memory, a processor, and a computer program stored in the memory, wherein the processor executes the computer program to implement the steps of the method described in the above aspects.

[0022] In a fourth aspect, the present disclosure provides a computer-readable storage medium having a computer program stored thereon, which implements the steps of the method described in the above aspects when executed by a processor.

[0023] In a fifth aspect, the present disclosure provides a computer program product, including a computer program / instructions, which implements the steps of the method described in the above aspects when the computer program is executed by a processor.

[0024] The present invention provides a control method and device for a main contactor of a traction inverter. The method and device obtain the current rising slope of an intermediate voltage of the traction inverter when receiving a closing command of the main contactor of the traction inverter. If the current rising slope of the intermediate voltage is less than the preset rising slope of the intermediate voltage, a current increasing auxiliary component is used to increase the pull-in current of the main contactor to avoid a stuck fault of the main contactor. The current increasing auxiliary component is integrated in the main contactor, and can achieve a short-term drive current increase by using the current increasing auxiliary component integrated in the main contactor before a stuck fault occurs, thereby reducing the failure rate of the main contactor and improving the reliability of the main contactor, thereby ensuring the normal operation of the traction system and improving the operating reliability of the electric locomotive. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The present disclosure will be described in more detail below based on embodiments and with reference to the accompanying drawings:

[0026] Figure 1 It is a structural schematic diagram of a main contactor of a traction converter in the related art;

[0027] Figure 2 A schematic diagram of a pre-charging circuit of a traction converter in the related art;

[0028] Figure 3 A schematic flow chart of a control method for a main contactor of a traction converter provided in an embodiment of the present disclosure;

[0029] Figure 4 A schematic diagram of a control circuit of a main contactor provided in an embodiment of the present disclosure;

[0030] Figure 5 A schematic diagram of a control process of a main contactor of a traction converter provided by an embodiment of the present disclosure;

[0031] Figure 6 A schematic structural diagram of a control device for a main contactor of a traction converter provided in an embodiment of the present disclosure. DETAILED DESCRIPTION

[0032] In order to enable those skilled in the art to better understand the technical solution of the present disclosure, and to fully understand and implement how the present disclosure applies technical means to solve technical problems and achieve the corresponding technical effects, the technical solution in the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only embodiments of a part of the present disclosure, not all of the embodiments. The embodiments of the present disclosure and the various features in the embodiments can be combined with each other without conflict, and the technical solutions formed are all within the scope of protection of the present disclosure. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in this field without making creative work should fall within the scope of protection of the present disclosure.

[0033] It should be noted that the terms "first", "second", etc. in the specification and claims of the present disclosure and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present disclosure described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product, or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products, or devices.

[0034] It should be noted that the steps shown in the flowcharts of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and that, although a logical order is shown in the flowcharts, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0035] Traction converters are widely used in traction transmission fields such as locomotives and EMUs. Their input usually uses line contactors to switch on and off the power supply. The line contactors are powered on by the control coil, and then the main contacts are controlled by the electromagnetic effect. Since the voltage and current of such line contactors are large, the electromagnetic design and the coordination of various mechanical components become the key to contactor design. In actual use, it is found that most line contactors have the phenomenon of stuck, and it is difficult to suppress the failure rate through design.

[0036] Figure 1 FIG. 1 is a schematic diagram of the structure of a main contactor of a traction converter in the related art. Figure 1As shown, 101 is the arc extinguishing cover, which is mainly used for eliminating the arc when the main contactor is disconnected; 102 is the main contact (also called the moving contact), when the control command is closed, the main contact moves and combines with the static contact, and the circuit is connected at this time; 103 is the reaction spring, which is used to apply reaction force to the main contact to keep it disconnected when the control command is disconnected, that is, when the control level is low; 104 is the coil resistance, which generates electromagnetic force when the control voltage is applied to control the main contact to close; 105 is the auxiliary contact; 106 is the mounting bracket; 107 is the electrical interface, connecting the static contact and the main circuit of the traction converter.

[0037] Figure 2 FIG. 1 is a schematic diagram of a pre-charging circuit of a traction converter in the related art. Figure 2 As shown in the figure, when the traction converter needs to work, in order to prevent the impact of the circuit and avoid the main contactor from being stuck, it is necessary to pre-charge and charge first, that is, close KM4 to charge the intermediate circuit through the pre-charging resistor R1. When charged to a certain voltage, close KM1 and the DC voltage reaches a stable value.

[0038] Based on this, the embodiment of the present disclosure provides a control method for the main contactor of a traction inverter. After accurately determining that the main contactor has a stuck fault, the method can utilize the current increasing auxiliary component integrated in the main contactor to increase the pull-in current of the main contactor, increase the pull-in force, overcome the original occasional excessive friction, and significantly reduce the stuck fault rate of the main contactor.

[0039] Embodiment 1

[0040] Figure 3 A flow chart of a control method for a main contactor of a traction converter provided by an embodiment of the present disclosure. Figure 3 As shown, a control method for a main contactor of a traction converter comprises:

[0041] S301, upon receiving a closing instruction of a main contactor of a traction converter, obtaining a current rising slope of an intermediate voltage of the traction converter;

[0042] S302, if the current intermediate voltage rising slope is less than the preset intermediate voltage rising slope, the current increasing auxiliary component is used to increase the pull-in current of the main contactor to avoid a stuck fault of the main contactor; wherein the current increasing auxiliary component is integrated in the main contactor.

[0043] Specifically, when a closing instruction of the main contactor of the traction converter is received, the current rising slope of the intermediate voltage of the traction converter can be obtained first; then, whether a stuck fault occurs in the main contactor can be determined based on the current rising slope of the intermediate voltage.

[0044] For example, the embodiment of the present disclosure can set a preset intermediate voltage rising slope and compare the current intermediate voltage rising slope with the preset intermediate voltage rising slope to determine whether the main contactor has a stuck fault. In the method of the embodiment of the present disclosure, it is considered that when the current intermediate voltage rising slope is less than the preset intermediate voltage rising slope, the main contactor has a stuck fault.

[0045] When it is monitored that the current intermediate voltage rising slope is less than the preset intermediate voltage rising slope, it indicates that the main contactor may have a stuck fault. Therefore, before the main contactor has a stuck fault, the current increasing auxiliary component can be used to increase the main contactor's pull-in current to avoid the main contactor from having a stuck fault.

[0046] Among them, the current increase auxiliary component can be integrated in the main contactor, so that the structure of the main contactor is highly integrated. Before the main contactor jams, the main contactor jam fault is handled through a small and simple circuit, achieving a short-term drive current increase, reducing the failure rate of the main contactor, and improving the reliability of the main contactor, thereby ensuring the normal operation of the traction system and improving the operation reliability of the electric locomotive.

[0047] According to the technical solution of the embodiment of the present disclosure, when receiving the closing command of the main contactor of the traction inverter, the current intermediate voltage rising slope of the traction inverter is obtained; if the current intermediate voltage rising slope is less than the preset intermediate voltage rising slope, the current increasing auxiliary component is used to increase the pull-in current of the main contactor to avoid a stuck fault of the main contactor; wherein the current increasing auxiliary component is integrated in the main contactor, and before a stuck fault occurs, the current increasing auxiliary component integrated in the main contactor can be used to achieve a short-term drive current increase, thereby reducing the failure rate of the main contactor and improving the reliability of the main contactor, thereby ensuring the normal operation of the traction system and improving the operating reliability of the electric locomotive.

[0048] Embodiment 2

[0049] Based on the above embodiment, the current increasing auxiliary component includes at least one group of auxiliary control contacts and a boost capacitor.

[0050] Specifically, the current increasing auxiliary component may include at least a group of auxiliary control contacts and a boost capacitor.

[0051] Figure 4 Schematic diagram of a control circuit of a main contactor provided in an embodiment of the present disclosure. Figure 4 As shown, BAT is the vehicle control battery and also the control power supply of the traction inverter; V1 is an anti-backflow diode; S1, S2, and S3 are a group of auxiliary control contacts; R is the coil resistance; and C is the boost capacitor.

[0052] Among them, the auxiliary control contacts S1, S2 and S3 and the boost capacitor C are the current increasing auxiliary components of the embodiment of the present disclosure, which are all newly added components of the embodiment of the present disclosure and are integrated in the following manner: Figure 1 In the main contactor shown, the main contactor has a small volume while ensuring the structural integration of the main contactor, thereby improving the reliability of the main contactor.

[0053] It is worth mentioning that the control circuit of the main contactor also has an expansion method. Through multiple groups of capacitors, a higher voltage attraction force can be provided, which can fundamentally solve the problem of main contactor jamming caused by insufficient attraction force.

[0054] Embodiment 3

[0055] Based on the above embodiment, when the current increase auxiliary component is in a non-working state, the coil resistance in the main contactor is connected in parallel with the boost capacitor through a group of auxiliary control contacts; when the current increase auxiliary component is in a working state, the coil resistance is connected in series with the boost capacitor through a group of auxiliary control contacts.

[0056] Specifically, in the normal operation of the main contactor, the current increase auxiliary component is in a non-working state, S1 is closed, S2 is disconnected, and S3 is closed. At this time, the boost capacitor is connected in parallel with the coil resistance R. As a parallel device, the boost capacitor can be suitable for fast and large current discharge scenarios and can be used repeatedly.

[0057] When the main contactor is stuck, the current increase auxiliary component is in working state, S1 is disconnected, S2 is closed, and S3 is disconnected. At this time, the boost capacitor is connected in series with the vehicle control battery, and together they become the power source of the coil resistor R. The DC voltage is increased to twice the original value, thereby increasing the pull-in current and pull-in force, and avoiding the main contactor from being stuck.

[0058] Based on this, after accurately determining that the main contactor has a stuck fault, the disclosed embodiment can use the current increase auxiliary component to achieve series boost by switching the circuit topology, thereby increasing the contactor coil current, increasing the pull-in force, overcoming the original occasional excessive friction, and significantly reducing the contactor's stuck fault rate.

[0059] Embodiment 4

[0060] Based on the above embodiment, obtaining the current rising slope of the intermediate voltage of the traction converter may include:

[0061] collecting the current intermediate DC voltage of the traction converter and the historical intermediate DC voltage before a preset time period;

[0062] Calculate the rising slope of the intermediate voltage of the traction converter by using the current intermediate DC voltage and the historical intermediate DC voltage;

[0063] If the change rate of the intermediate voltage rising slope is less than the preset change rate, it is determined that the intermediate voltage rising slope is the current intermediate voltage rising slope of the traction converter.

[0064] Specifically, when receiving the closing command of the main contactor of the traction converter, the intermediate voltage rising slope is monitored in real time. Obviously, there is a large difference in the intermediate DC voltage rising slope when KM4 is closed and KM1 is closed, which is used as the criterion for the main contactor to be blocked.

[0065] Exemplarily, the embodiment of the present disclosure can collect the current intermediate DC voltage of the traction converter and the historical intermediate DC voltage before a preset time period to calculate the intermediate voltage rising slope. Here, the intermediate voltage rising slope can be calculated by the following formula:

[0066]

[0067] Wherein, λ represents the rising slope of the intermediate voltage, T0 represents the preset time interval, U1 represents the historical intermediate DC voltage, and U2 represents the current intermediate DC voltage.

[0068] After the intermediate voltage rising slope is calculated by the above formula, a certain filter is used to compare the change rate of the intermediate voltage rising slope. If the change rate of the intermediate voltage rising slope is less than the preset change rate, the intermediate voltage rising slope is determined to be the current intermediate voltage rising slope of the traction converter. Here, the preset change rate can be set according to actual needs, and the embodiment of the present disclosure does not specifically limit this.

[0069] Embodiment 5

[0070] Based on the above embodiment, the method may further include:

[0071] Obtaining an updated current intermediate voltage rising slope of the traction converter;

[0072] If the updated rising slope of the current intermediate voltage is less than the preset rising slope of the intermediate voltage, the current increasing auxiliary component is controlled to be in a working state.

[0073] Specifically, after using the current increasing auxiliary component to increase the pull-in current of the main contactor, the updated current intermediate voltage rising slope of the traction inverter can also be obtained; then, through the updated current intermediate voltage rising slope, it is determined whether the main contactor still has a stuck fault.

[0074] When it is monitored that the updated current intermediate voltage rising slope is less than the preset intermediate voltage rising slope, the current increase auxiliary component is controlled to be in a working state, and the current increase auxiliary component continues to be used to increase the pull-in current of the main contactor to avoid a stuck fault of the main contactor, thereby reducing the stuck fault rate of the main contactor.

[0075] Embodiment 6

[0076] Based on the above embodiment, the method may further include:

[0077] If the updated rising slope of the current intermediate voltage is greater than or equal to the preset rising slope of the intermediate voltage, the current increasing auxiliary component is controlled to be in a non-working state.

[0078] Specifically,

[0079] When the updated current intermediate voltage rising slope is greater than or equal to the preset intermediate voltage rising slope, it indicates that the main contactor will not have a stuck fault and the main circuit is successfully configured. At this time, the current increase auxiliary component can be controlled to be in a non-working state. Therefore, it is possible to reduce the stuck fault rate of the main contactor, save energy consumption, and improve the success rate of the main circuit configuration.

[0080] Embodiment 7

[0081] Based on the above embodiments, this embodiment provides an application example.

[0082] Figure 5 A schematic diagram of a control process of a main contactor of a traction converter provided by an embodiment of the present disclosure. Figure 5 As shown, when the control unit of the traction converter issues a pre-charging command, the control power supply issues a main contactor closing command, monitors the current intermediate voltage rising slope of the intermediate circuit of the traction converter in real time, and determines whether the current intermediate voltage rising slope meets expectations, such as whether the current intermediate voltage rising slope is less than the preset intermediate voltage rising slope. The determination of the current intermediate voltage rising slope and the determination of whether the current intermediate voltage rising slope meets expectations can be found in the previous text, and will not be repeated here.

[0083] If the current intermediate voltage rising slope meets expectations, the main circuit configuration is successful. If the current intermediate voltage rising slope does not meet expectations, it means that the main contactor has a stuck fault. At this time, the current increase auxiliary component can be controlled to be in working state, and S1~S3 are automatically configured, that is, S1 is disconnected, S2 is closed, and S3 is disconnected. If the main contactor passes 110V voltage normally, the capacitor originally connected in parallel on the control side of the contactor is connected in series with the control power supply through a certain topology switching, and together provide power for the coil resistor R, and the DC voltage is increased to twice the original, thereby increasing the pull-in current and pull-in force to avoid stuck faults.

[0084] Then, you can continue to monitor whether the current intermediate voltage rising slope meets expectations. If the current intermediate voltage rising slope still does not meet expectations, the configuration is maintained, and the current increase auxiliary component continues to be controlled to be in a working state to avoid a stuck fault in the main contactor; if the current intermediate voltage rising slope meets expectations, the main contactor is successfully energized and exits the S1-S3 automatic configuration, that is, S1 is closed, S2 is disconnected, and S3 is closed, the current increase auxiliary component is controlled to be in a non-working state, and the main circuit configuration is completed.

[0085] If the control unit of the traction converter does not issue a pre-charging command, it means that the charging has timed out and the traction converter is protected.

[0086] Based on this, the disclosed embodiment can process the main contactor card fault through a small volume and simple circuit, and because the parallel device is a capacitor, it is suitable for fast high current discharge scenarios and can be used repeatedly. The circuit configuration contactor can be implemented with an auxiliary contact that matches the main contactor, and its structure is highly integrated and has a low failure rate.

[0087] The embodiment of the present disclosure can achieve voltage boosting through circuit configuration. Therefore, based on the embodiment of the present disclosure, this function can also be achieved by switching multiple groups of capacitors or batteries in parallel.

[0088] The above mainly introduces the scheme provided by the embodiment of the present disclosure. It is understandable that in order to realize the above functions, the electronic device includes a hardware structure and / or software module corresponding to the execution of each function. Those skilled in the art should easily realize that, in combination with the units and algorithm steps of each example described in the embodiment disclosed in this article, the present disclosure can be implemented in the form of hardware or a combination of hardware and computer software. Whether a function is executed in the form of hardware or computer software driving hardware depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to exceed the scope of the present disclosure.

[0089] The disclosed embodiment can divide the electronic device into functional units according to the above method example. For example, each functional module can be divided according to each function, or two or more functions can be integrated into one processing module. The above integrated module can be implemented in the form of hardware or in the form of software functional modules. It should be noted that the division of modules in the disclosed embodiment is schematic and is only a logical function division. There may be other division methods in actual implementation.

[0090] In the case of dividing each functional module according to each function, an embodiment of the present disclosure provides a control device for a main contactor of a traction converter. Figure 6 A schematic diagram of the structure of a control device for a main contactor of a traction converter provided by an embodiment of the present disclosure. Figure 6 As shown, the device 600 includes:

[0091] An acquisition module 601 is used to acquire a current rising slope of the intermediate voltage of the traction converter when receiving a closing instruction of a main contactor of the traction converter;

[0092] The control module 602 is used to increase the pull-in current of the main contactor by using a current increase auxiliary component if the current intermediate voltage rising slope is less than the preset intermediate voltage rising slope, so as to avoid a stuck fault of the main contactor; wherein the current increase auxiliary component is integrated in the main contactor.

[0093] In some embodiments, the current increasing auxiliary component includes at least a set of auxiliary control contacts and a boost capacitor.

[0094] In some embodiments, when the current increase auxiliary component is in a non-working state, the coil resistance in the main contactor is connected in parallel with the boost capacitor through the set of auxiliary control contacts; when the current increase auxiliary component is in a working state, the coil resistance is connected in series with the boost capacitor through the set of auxiliary control contacts.

[0095] In some embodiments, the acquisition module 601 is also used to collect the current intermediate DC voltage of the traction inverter and the historical intermediate DC voltage before a preset time period; use the current intermediate DC voltage and the historical intermediate DC voltage to calculate the intermediate voltage rising slope of the traction inverter; if the change rate of the intermediate voltage rising slope is less than the preset change rate, determine that the intermediate voltage rising slope is the current intermediate voltage rising slope of the traction inverter.

[0096] In some embodiments, the method further comprises:

[0097] The acquisition module 601 is further used to acquire the updated current intermediate voltage rising slope of the traction converter;

[0098] The control module 602 is further configured to control the current increasing auxiliary component to be in a working state if the updated current intermediate voltage rising slope is less than the preset intermediate voltage rising slope.

[0099] In some embodiments, the control module 602 is further configured to control the current increasing auxiliary component to be in a non-working state if the updated current intermediate voltage rising slope is greater than or equal to the preset intermediate voltage rising slope.

[0100] On the basis of the above embodiments, this embodiment provides a computer device, including a memory, a processor, and a computer program stored in the memory, wherein the processor executes the computer program to implement the steps of the method described in the above embodiments.

[0101] In some implementations of this embodiment, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the steps of the method described in the above embodiment are implemented.

[0102] In some implementations of this embodiment, a computer program product is provided, including a computer program / instructions, and when the computer program is executed by a processor, the steps of the method described in the above embodiment are implemented.

[0103] The processor may include, but is not limited to, one or more processors or microprocessors, etc. Each processor may be 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 to execute the methods in the above embodiments.

[0104] The computer-readable storage medium may be implemented by any type of volatile or non-volatile storage device or a combination thereof, and the computer-readable storage medium may include but is not limited to, for example, random access memory (RAM), read-only memory (ROM), flash memory, EPROM memory, EEPROM memory, registers, computer storage media (e.g., hard disk, floppy disk, solid-state drive, removable disk, CD-ROM, DVD-ROM, Blu-ray disc, etc.).

[0105] The computer-readable storage medium may also store at least one computer executable program / instruction, which may be, for example, a computer-readable instruction. The computer-readable storage medium includes, but is not limited to, for example, a volatile memory and / or a non-volatile memory. The volatile memory may include, for example, a random access memory (RAM) and / or a cache memory (cache), etc. The computer-readable storage medium may include, for example, a read-only memory (ROM), a hard disk, a flash memory, etc. For example, a non-transitory computer-readable storage medium may be connected to a computing device such as a computer, and then, when the computing device runs the computer-readable instructions stored on the computer-readable storage medium, the various methods described above may be performed.

[0106] In addition, the computer device may also include (but not limited to) a data bus, an input / output (I / O) bus, a display, and input / output devices (eg, keyboard, mouse, speaker, etc.), etc.

[0107] The processor may communicate with external devices via an I / O bus via a wired or wireless network.

[0108] In one embodiment, the at least one computer executable instruction may also be compiled into or constitute a software product / computer program product, wherein one or more computer executable instructions are executed by a processor to perform the various functions and / or method steps in the embodiments described in the present technology.

[0109] In the embodiments provided in the present disclosure, it should be understood that the disclosed devices and methods can also be implemented in other ways. The device embodiments described above are merely schematic. For example, the flowcharts and block diagrams in the accompanying drawings show the possible architecture, functions and operations of the devices, methods and computer program products according to multiple embodiments of the present disclosure. In this regard, each box in the flowchart or block diagram can represent a module, a program segment or a part of a code, and the above-mentioned module, program segment or a part of the code contains one or more executable instructions for implementing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the box can also occur in a different order from the order marked in the accompanying drawings. For example, two consecutive boxes can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram and / or flowchart, and the combination of boxes in the block diagram and / or flowchart can be implemented with a dedicated hardware-based system that performs a specified function or action, or can be implemented with a combination of dedicated hardware and computer instructions.

[0110] It should be noted that in the present disclosure, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element limited by the sentence "includes a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.

[0111] Although the embodiments disclosed in the present disclosure are as above, the above contents are only embodiments adopted for facilitating the understanding of the present disclosure and are not intended to limit the present disclosure. Any technician in the technical field to which the present disclosure belongs can make any modifications and changes in the form and details of the implementation without departing from the spirit and scope disclosed in the present disclosure, but the scope of patent protection of the present disclosure shall still be subject to the scope defined in the attached claims.

Claims

1. A control method for a main contactor of a traction converter, characterized in that: include: Upon receiving a closing instruction of a main contactor of a traction converter, obtaining a current rising slope of an intermediate voltage of the traction converter; If the current intermediate voltage rising slope is less than the preset intermediate voltage rising slope, the current increasing auxiliary component is used to increase the pull-in current of the main contactor to avoid a stuck fault of the main contactor; wherein the current increasing auxiliary component is integrated in the main contactor.

2. The method according to claim 1, characterized in that The current increasing auxiliary component comprises at least a group of auxiliary control contacts and a boost capacitor.

3. The method according to claim 2, characterized in that When the current increasing auxiliary component is in a non-operating state, the coil resistance in the main contactor is connected in parallel with the boost capacitor through the set of auxiliary control contacts; When the current increasing auxiliary component is in working state, the coil resistor is connected in series with the boost capacitor through the group of auxiliary control contacts.

4. The method according to claim 1, characterized in that The obtaining the current rising slope of the intermediate voltage of the traction converter comprises: collecting a current intermediate DC voltage of the traction converter and a historical intermediate DC voltage before a preset time period; Calculating a rising slope of an intermediate voltage of the traction converter by using the current intermediate DC voltage and the historical intermediate DC voltage; If the change rate of the intermediate voltage rising slope is less than the preset change rate, it is determined that the intermediate voltage rising slope is the current intermediate voltage rising slope of the traction converter.

5. The method according to any one of claims 1 to 4, characterized in that The method further comprises: Acquiring an updated current intermediate voltage rising slope of the traction converter; If the updated current intermediate voltage rising slope is less than the preset intermediate voltage rising slope, the current increasing auxiliary component is controlled to be in a working state.

6. The method according to claim 5, characterized in that The method further comprises: If the updated current intermediate voltage rising slope is greater than or equal to the preset intermediate voltage rising slope, the current increasing auxiliary component is controlled to be in a non-working state.

7. A control device for a main contactor of a traction converter, characterized in that: include: An acquisition module, configured to acquire a current rising slope of an intermediate voltage of the traction converter upon receiving a closing instruction of a main contactor of the traction converter; A control module is used to increase the pull-in current of the main contactor by using a current increasing auxiliary component if the current intermediate voltage rising slope is less than the preset intermediate voltage rising slope, so as to avoid a stuck fault of the main contactor; wherein the current increasing auxiliary component is integrated in the main contactor.

8. A computer device comprising a memory, a processor and a computer program stored in the memory, characterized in that: The processor executes the computer program to implement the steps of the method according to any one of claims 1 to 6.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 6 are implemented.

10. A computer program product comprising a computer program / instructions, characterized in that When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 6 are implemented.

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