Grid-connected control method and device of train auxiliary power supply system, electronic equipment, storage medium and computer program product

Abstract

The invention provides a grid-connected control method and device for a train auxiliary power supply system, electronic equipment, a storage medium and a computer program product. The method comprises the steps of controlling a medium-voltage bus controller to be closed when it is detected that a network voltage signal of any auxiliary inverter SIV is larger than a voltage threshold value and output contactors KMA of all the auxiliary inverters SIV are in an open state; after a state signal fed back by a first auxiliary converter ACU is received, a grid connection instruction is sent to the first auxiliary converter ACU, so that the first auxiliary converter ACU closes an output contactor KMA of an auxiliary inverter SIV, the state signal is generated after the auxiliary inverter SIV is started, and the state signal is generated after the auxiliary inverter SIV is started. The first auxiliary converter ACU is one of the at least one auxiliary converter ACU; and after a feedback signal which is sent by the first auxiliary converter ACU after the output contactor KMA is closed and represents successful grid connection is received, alternating current bus voltage synchronization is carried out on other auxiliary converters ACU, and grid connection starting is completed.

Description

Technical Field

[0001] The present application relates to grid-connected control technology, and in particular to a grid-connected control method, device, electronic equipment, storage medium and computer program product for a train auxiliary power supply system. Background Art

[0002] At present, the grid-connected control method for the train auxiliary power supply system is relatively complicated, and it is impossible to achieve fast and accurate grid-connected control. Summary of the invention

[0003] The embodiments of the present application provide a grid-connected control method, device, electronic device, storage medium and computer program product for a train auxiliary power supply system, which can achieve fast and accurate grid-connected control.

[0004] The technical solution of the embodiment of the present application is implemented as follows:

[0005] The embodiment of the present application provides a grid-connected control method for a train auxiliary power supply system, wherein the train auxiliary power supply system includes at least two auxiliary converters ACU, and the auxiliary converter ACU includes an auxiliary inverter SIV. The method includes:

[0006] When it is detected that the grid voltage signal of any auxiliary inverter SIV is greater than the voltage threshold and all auxiliary inverter SIV output contactors KMA are in the disconnected state, the medium voltage bus controller is controlled to close;

[0007] After receiving a state signal fed back by the first auxiliary converter ACU, sending a grid-connection instruction to the first auxiliary converter ACU so that the first auxiliary converter ACU closes the output contactor KMA of the auxiliary inverter SIV, wherein the state signal is generated after the auxiliary inverter SIV is started, and the first auxiliary converter ACU is one of the at least one auxiliary converter ACU;

[0008] After receiving the feedback signal indicating successful grid connection sent by the first auxiliary converter ACU after closing the output contactor KMA, the AC bus voltages of other auxiliary converters ACU are synchronized to complete grid connection startup.

[0009] In the above scheme, the method further includes:

[0010] If no feedback signal of the Nth auxiliary converter ACU is received within the target time after sending the grid-connection instruction to the Nth auxiliary converter ACU, a grid-connection instruction is sent to the N+1th auxiliary converter ACU until a feedback signal is received, and the sending of the grid-connection instruction is stopped, where N is a positive integer greater than or equal to 1.

[0011] In the above scheme, the method further includes:

[0012] If the at least two auxiliary converters ACU are both successfully connected to the grid and started, no load shedding is performed on the train load;

[0013] If a first number of the at least two auxiliary converters ACU fail to start up in grid connection, a target second number of train loads is shut down.

[0014] In the above scheme, the method further includes:

[0015] When a communication failure between the auxiliary converter ACU and the train control management system is detected, the train is assisted in load reduction.

[0016] In the above scheme, the method further includes:

[0017] When it is detected that at least one of the at least two auxiliary inverters SIV is short-circuited, the short-circuited auxiliary inverter SIV is connected to the grid and restarted.

[0018] The embodiment of the present application provides a grid-connected control device for a train auxiliary power supply system, wherein the train auxiliary power supply system includes at least two auxiliary converters ACU, wherein the auxiliary converter ACU includes an auxiliary inverter SIV, and the device includes:

[0019] The detection module is used to control the medium voltage bus controller to close when it is detected that the grid voltage signal of any auxiliary inverter SIV is greater than the voltage threshold and all the auxiliary inverter SIV output contactors KMA are in the disconnected state;

[0020] a sending module, configured to send a grid-connection instruction to the first auxiliary converter ACU after receiving a state signal fed back by the first auxiliary converter ACU, so that the first auxiliary converter ACU closes the output contactor KMA of the auxiliary inverter SIV, wherein the state signal is generated after the auxiliary inverter SIV is started, and the first auxiliary converter ACU is one of the at least one auxiliary converter ACU;

[0021] The receiving module is used to synchronize the AC bus voltages of other auxiliary converters ACU to complete grid-connected startup after receiving the feedback signal indicating successful grid connection sent by the first auxiliary converter ACU after closing the output contactor KMA.

[0022] In the above scheme, the sending module is also used to send a grid-connected instruction to the N+1th auxiliary converter ACU if no feedback signal of the Nth auxiliary converter ACU is received within the target time after sending the grid-connected instruction to the Nth auxiliary converter ACU, until the feedback signal is received, and stop sending the grid-connected instruction, where N is a positive integer greater than or equal to 1.

[0023] In the above scheme, the device also includes: a load processing module, which is used to not reduce the train load if the at least two auxiliary converters ACU are successfully connected to the grid and started; if a first number of auxiliary converters ACU among the at least two auxiliary converters ACU fail to start up the grid, shut down the target second number of train loads.

[0024] In the above solution, the load processing module is also used to assist the train in load reduction when a communication failure between the auxiliary converter ACU and the train control management system is detected.

[0025] In the above solution, the device further includes: a short circuit processing module, which is used to restart the short-circuited auxiliary inverter SIV when it is detected that at least one auxiliary inverter SIV among the at least two auxiliary inverters SIV is short-circuited.

[0026] An embodiment of the present application provides an electronic device, including:

[0027] A memory for storing executable instructions;

[0028] The processor is used to implement the grid-connected control method of the train auxiliary power supply system provided in the embodiment of the present application when executing the executable instructions stored in the memory.

[0029] An embodiment of the present application provides a computer-readable storage medium storing executable instructions for causing a processor to execute and implement the grid-connected control method of the train auxiliary power supply system provided in the embodiment of the present application.

[0030] An embodiment of the present application provides a computer program product storing a computer program for implementing the grid-connected control method of the train auxiliary power supply system provided in the embodiment of the present application when executed by a processor.

[0031] The embodiment of the present application controls the closing of the medium voltage bus controller when it is detected that the grid voltage signal of any auxiliary inverter SIV is greater than the voltage threshold and the output contactors KMA of all auxiliary inverters SIV are in the disconnected state; after receiving the status signal fed back by the first auxiliary inverter ACU, a grid-connected instruction is sent to the first auxiliary inverter ACU to make the first auxiliary inverter ACU close the output contactor KMA of the auxiliary inverter SIV, wherein the status signal is generated after the auxiliary inverter SIV is started, and the first auxiliary inverter ACU is one of the at least one auxiliary inverter ACU; after receiving the feedback signal indicating successful grid connection sent by the first auxiliary inverter ACU after closing the output contactor KMA, the AC bus voltage of other auxiliary inverters ACU is synchronized to complete the grid-connected startup, thereby realizing fast and accurate grid-connected control. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is an optional structural diagram of a grid-connected control system of a train auxiliary power supply system provided in an embodiment of the present application;

[0033] Figure 2 is an optional structural diagram of an electronic device provided in an embodiment of the present application;

[0034] Figure 3 It is an optional flow chart of a grid-connected control method of a train auxiliary power supply system provided in an embodiment of the present application;

[0035] Figure 4 It is an optional circuit diagram of the emergency traction mode provided in an embodiment of the present application. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings. The described embodiments should not be regarded as limiting the present application. All other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of this application.

[0037] In the following description, reference is made to “some embodiments”, which describe a subset of all possible embodiments, but it will be understood that “some embodiments” may be the same subset or different subsets of all possible embodiments and may be combined with each other without conflict.

[0038] In the following description, the terms "first\second\third" involved are merely used to distinguish similar objects and do not represent a specific ordering of the objects. It can be understood that "first\second\third" can be interchanged with a specific order or sequence where permitted, so that the embodiments of the present application described here can be implemented in an order other than that illustrated or described here.

[0039] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein are only for the purpose of describing the embodiments of this application and are not intended to limit this application.

[0040] The embodiments of the present application provide a grid-connected control method, device, electronic device and computer-readable storage medium for a train auxiliary power supply system, which can achieve fast and accurate grid-connected control.

[0041] First, the grid-connected control system of the train auxiliary power supply system provided in the embodiment of the present application is described. Figure 1 , Figure 1It is an optional structural diagram of the grid-connected control system 100 of the train auxiliary power supply system provided in the embodiment of the present application. In order to realize the grid-connected control application supporting a train auxiliary power supply system, the train control management system 101 is communicatively connected with the train auxiliary power supply system 102. Here, the train auxiliary power supply system 102 includes at least two auxiliary converters ACU, and the auxiliary converter ACU includes an auxiliary inverter SIV. The communication connection between the train control management system 101 and the train auxiliary power supply system 102 can be an electrical connection, or a CAN bus connection, etc.

[0042] Next, the electronic device for implementing the grid-connected control method of the train auxiliary power supply system provided in the embodiment of the present application is described. Figure 2 , Figure 2 is an optional structural diagram of an electronic device 200 provided in an embodiment of the present application. In practical applications, the electronic device 200 can be implemented as Figure 1 The train control management system 101 or server 101 in the embodiment of the present invention is a train control management system 101 or server 101, which is a train control management system 101 or server 101 in the embodiment of the present invention. Figure 1 Taking the train control management system 101 shown as an example, the electronic device for implementing the grid-connected control method of the train auxiliary power supply system of the embodiment of the present application is described.

[0043] Figure 2 The electronic device 200 shown includes: at least one processor 201 and a memory 202. The various components in the electronic device 200 are coupled together via a bus system 203. It is understood that the bus system 203 is used to achieve connection and communication between these components. In addition to the data bus, the bus system 203 also includes a power bus, a control bus, and a status signal bus. However, for the sake of clarity, the bus system 203 is not described in detail. Figure 2 Various buses are labeled as bus system 203.

[0044] The processor 201 can be an integrated circuit chip with signal processing capabilities, such as a general-purpose processor, a digital signal processor (DSP), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc., where the general-purpose processor can be a microprocessor or any conventional processor, etc.

[0045] The memory 202 may be removable, non-removable, or a combination thereof. Exemplary hardware devices include solid-state memory, hard disk drives, optical disk drives, etc. The memory 202 may optionally include one or more storage devices that are physically remote from the processor 201.

[0046] The memory 202 includes a volatile memory or a non-volatile memory, and may also include both volatile and non-volatile memories. The non-volatile memory may be a read-only memory (ROM), and the volatile memory may be a random access memory (RAM). The memory 202 described in the embodiments of the present application is intended to include any suitable type of memory.

[0047] In some embodiments, the memory 202 can store data to support various operations, examples of which include programs, modules, and data structures, or subsets or supersets thereof. In the embodiment of the present application, the memory 202 stores an operating system 2021 and a grid-connected control device 2022 based on a train auxiliary power supply system; specifically,

[0048] Operating system 2021, including system programs for processing various basic system services and performing hardware-related tasks, such as a framework layer, a core library layer, a driver layer, etc., for implementing various basic services and processing hardware-based tasks;

[0049] In some embodiments, the grid-connected control device based on the train auxiliary power supply system provided in the embodiments of the present application can be implemented in a software manner. Figure 2 The grid-connected control device 2022 based on the train auxiliary power supply system stored in the memory 202 is shown, which can be software in the form of programs and plug-ins, including the following software modules: a detection module 20221, a sending module 20222 and a receiving module 20223. These modules are logical, so they can be arbitrarily combined or further split according to the functions implemented. The functions of each module will be explained below.

[0050] In other embodiments, the grid-connected control device based on the train auxiliary power supply system provided in the embodiments of the present application can be implemented in hardware. As an example, the grid-connected control device based on the train auxiliary power supply system provided in the embodiments of the present application can be a processor in the form of a hardware decoding processor, which is programmed to execute the grid-connected control method based on the train auxiliary power supply system provided in the embodiments of the present application. For example, the processor in the form of a hardware decoding processor can adopt one or more application-specific integrated circuits (ASICs), DSPs, programmable logic devices (PLDs), complex programmable logic devices (CPLDs), field programmable gate arrays (FPGAs) or other electronic components.

[0051] The following will explain the grid-connected control method of the train auxiliary power supply system provided in the embodiment of the present application in combination with the exemplary application and implementation of the train control management system provided in the embodiment of the present application.

[0052] See also Figure 3 , Figure 3 is an optional flow chart of a grid-connected control method for a train auxiliary power supply system provided in an embodiment of the present application, which will be combined with Figure 3 The train auxiliary power supply system includes at least two auxiliary converters ACU, the auxiliary converter ACU includes an auxiliary inverter SIV, and the method includes:

[0053] Step 301, when it is detected that the grid voltage signal of any auxiliary inverter SIV is greater than the voltage threshold and all the auxiliary inverter SIV output contactors KMA are in the open state, the medium voltage bus controller is controlled to close;

[0054] Step 302: after receiving a state signal fed back by the first auxiliary converter ACU, sending a grid connection instruction to the first auxiliary converter ACU so that the first auxiliary converter ACU closes the output contactor KMA of the auxiliary inverter SIV, wherein the state signal is generated after the auxiliary inverter SIV is started, and the first auxiliary converter ACU is one of the at least one auxiliary converter ACU;

[0055] Step 303: after receiving the feedback signal indicating successful grid connection sent by the first auxiliary converter ACU after closing the output contactor KMA, synchronizing the AC bus voltages of other auxiliary converters ACU to complete grid connection startup.

[0056] In actual implementation, the auxiliary inverter SIV is controlled by the train network, and the parallel power supply provides three-phase and single-phase AC power for the train load. TCMS sends the grid connection command "ACU Start" to the auxiliary inverter SIV of the first auxiliary converter ACU in sequence, and the auxiliary inverter SIV completes the parallel power supply after the automatic phase locking is successful. Specifically, after the train is activated, the train control management system TCMS starts, and when it detects that the grid voltage signal of any auxiliary inverter SIV is greater than DC900V, and all auxiliary inverter SIV output contactors KMA are disconnected, TCMS closes the medium-voltage bus contactor.

[0057] In the embodiment of the present application, there can be 4 auxiliary inverters SIV. When the DC1500V grid voltage and DC110V control power supply of the auxiliary inverter SIV are normal, each auxiliary inverter SIV starts automatically and disconnects the output contactor KMA, and sends a status signal "ACU Internal OK" to TCMS. After TCMS receives at least one "ACU Internal OK" signal, it issues a grid-connected instruction "ACU Start". Here, the grid-connected instruction has a pulse width of 3s. In the embodiment of the present application, the grid-connected instruction "ACU Start" is first sent to the first auxiliary inverter SIV1 by default to close the KMA load contactor. After the first auxiliary inverter SIV closes KMA, it sends a feedback signal "ACU Bus Active" to TCMS. If the feedback signal indicating successful grid connection is received from the first auxiliary converter ACU after closing the output contactor KMA, the AC bus voltage of other auxiliary converters ACU is synchronized to complete the grid-connected startup.

[0058] The embodiment of the present application controls the closing of the medium voltage bus controller when it is detected that the grid voltage signal of any auxiliary inverter SIV is greater than the voltage threshold and the output contactors KMA of all auxiliary inverters SIV are in the disconnected state; after receiving the status signal fed back by the first auxiliary inverter ACU, a grid-connected instruction is sent to the first auxiliary inverter ACU to make the first auxiliary inverter ACU close the output contactor KMA of the auxiliary inverter SIV, wherein the status signal is generated after the auxiliary inverter SIV is started, and the first auxiliary inverter ACU is one of the at least one auxiliary inverter ACU; after receiving the feedback signal indicating successful grid connection sent by the first auxiliary inverter ACU after closing the output contactor KMA, the AC bus voltage of other auxiliary inverters ACU is synchronized to complete the grid-connected startup, thereby realizing fast and accurate grid-connected control.

[0059] In some embodiments, the method also includes: if no feedback signal of the Nth auxiliary converter ACU is received within the target time after sending the grid-connected instruction to the Nth auxiliary converter ACU, then sending the grid-connected instruction to the N+1th auxiliary converter ACU until the feedback signal is received, and stopping sending the grid-connected instruction, where N is a positive integer greater than or equal to 1.

[0060] In actual implementation, if TCMS does not receive the feedback signal "ACU Bus Active" from the first auxiliary inverter SIV within the target duration (e.g. 7s), TCMS automatically sends an initial start command to the second auxiliary inverter ACU and executes the above steps until the feedback signal is received and the grid connection command is stopped. That is, TCMS stops sending the "ACU Start" signal after receiving the "ACU Bus Active".

[0061] In some embodiments, the method also includes: if the at least two auxiliary converters ACU are successfully connected to the grid and started, the train load is not reduced; if a first number of auxiliary converters ACU among the at least two auxiliary converters ACU fail to be connected to the grid and started, the target second number of train loads is shut down.

[0062] In actual implementation, the train load is, for example, an air conditioning compressor. For example, when TCMS receives 3 or more "ACUBus Active" signals, the load is not reduced. When TCMS receives only 2 "ACU Bus Active", half of the air conditioning compressors are reduced. When TCMS receives only 1 "ACU Bus Active", all air conditioning compressors are turned off, and the air conditioning only has ventilation function.

[0063] In some embodiments, the method further includes: when a communication failure between the auxiliary converter ACU and the train control management system is detected, auxiliary load reduction processing is performed on the train.

[0064] In actual implementation, when the auxiliary inverter SIV fails to communicate with TCMS, the auxiliary inverter SIV is maintained, the bus contactor is closed, the network defaults to the auxiliary inverter SIV loss and performs corresponding load shedding. When the train network is paralyzed, it switches to manual emergency traction mode.

[0065] In some embodiments, the method further includes: when it is detected that at least one of the at least two auxiliary inverters SIV is short-circuited, connecting the short-circuited auxiliary inverter SIV to the grid and restarting it.

[0066] In actual scenarios, the train is equipped with a medium-voltage bus contactor to divide the medium-voltage bus into two branches. The isolation contactor KMK is used to isolate the short-circuited branch. When a short-circuit fault occurs in the AC380V medium-voltage bus, TCMS is responsible for short-circuit location and isolation of the faulty branch, and the ACU should assist TCMS in this process. There are two types of short-circuit faults: internal short circuit and external short circuit. Among them, the internal section is, the short circuit is located at the front end of the auxiliary inverter SIV load contactor. The external short circuit is not, the short circuit occurs in the local branch, located between the auxiliary inverter SIV load contactor and the bus isolation contactor. When the above short-circuit protection occurs, the auxiliary inverter SIV automatically shuts down for protection, gives a 20OC fault signal, and cancels the "ACU Bus Active" signal.

[0067] The operating sequence of a short circuit fault is as follows:

[0068] 1) When 20OC occurs in 1 to 3 auxiliary inverters SIV, there are still auxiliary inverters SIV with normal output on the load bus (and ACU Bus Active signal), the faulty auxiliary inverter SIV automatically restarts and connects to the grid, and restarts once. If one of the auxiliary inverters SIV continues to have a 20OC fault, it is judged as an internal short circuit, and the auxiliary inverter SIV is locked and does not start automatically.

[0069] 2) When 20OC faults occur in the four auxiliary inverters SIV at the same time, it indicates that there is an internal or external short circuit (load short circuit or bus short circuit). After the above fault occurs, the network starts the auxiliary inverter SIV according to the "normal start logic" and starts timing. In the subsequent 40s, it is determined whether any auxiliary inverter SIV sends an "ACU Bus Active" signal. If so, the whole vehicle operates normally. If more than 40s, none of the auxiliary inverters SIV sends an "ACU BusActive" signal, it is judged as an external short circuit and the bus contactor is disconnected. The network sends "independent power" to the auxiliary inverter SIV to operate in "independent operation mode". The four auxiliary inverters SIV automatically restart and connect to the grid. If the grid connection is successful, it means that the short-circuited load has been disconnected (the short circuit disappears). During the automatic recovery of the auxiliary inverter SIV, if one of the auxiliary inverters SIV has an internal short circuit, the auxiliary inverter SIV will be automatically cut off and locked, and the other auxiliary inverters SIV will start and connect to the grid normally, indicating that the removed auxiliary inverter SIV has an internal short circuit. During the automatic recovery of the auxiliary inverter SIV, if all auxiliary inverters SIV can start normally (indicating that there is no internal short circuit in the auxiliary inverter SIV); during the automatic grid connection of the 4 auxiliary inverters SIV, if the grid connection fails, all auxiliary inverters SIV will stop and wait. The network disconnects all bus contactors and switches to the independent power supply mode "independent power". The network sends an independent power command to the auxiliary inverter SIV. The auxiliary inverter SIV automatically closes the KMA and outputs to the outside again.

[0070] In some embodiments, if TCMS detects a bus contactor KMK card failure, the auxiliary inverters SIV at both ends of the KMK do not send a start signal and maintain the current state. And continue to give the KMK disconnection instruction. When a card failure is detected, all KMKs give a disconnection instruction and send an independent operation instruction to the auxiliary inverter SIV.

[0071] In some embodiments, when the network fails, the emergency traction button in the driver's cab is manually operated to be placed in "emergency traction mode". In this working mode, the auxiliary inverter SIV continues to work. The status signal of this mode is sent to all auxiliary inverters SIV, TCMS and medium voltage bus contactor box through hard wire. For example, see Figure 4 , Figure 4 This is an optional circuit diagram of the emergency traction mode provided in the embodiment of the present application. KMK is a bus contactor, K1 is a relay for closing the bus contactor under network control, K2 is a relay for disconnecting the bus contactor under network control, and KT is a time delay relay for manually controlling the removal of the bus contactor.

[0072] When the train enters the "emergency traction mode", the emergency traction button is manually pressed, and the bus contactor continues to remain in the closed state; if each auxiliary inverter SIV is already in the external output state, it will continue to be maintained; if each auxiliary inverter SIV has not completed the external output, it will complete the external output according to the following logic:

[0073] 1. After the internal startup of the auxiliary inverter SIV1 is completed, the load contactor KMA is immediately closed to complete the external output; other auxiliary inverters SIV automatically complete the phase lock and then output to the outside;

[0074] 2. If the auxiliary inverter SIV2 still fails to detect that the AC bus is powered after 10 seconds, the auxiliary inverter SIV2 closes the load contactor KMA to complete the external output; the other auxiliary inverters SIV automatically complete the phase lock and then output to the outside;

[0075] 3. If the auxiliary inverter SIV3 still fails to detect that the AC bus is powered after 20 seconds, the auxiliary inverter SIV3 closes the load contactor KMA to complete the external output; the other auxiliary inverters SIV automatically complete the phase lock and then output to the outside;

[0076] 4. If the auxiliary inverter SIV4 still fails to detect that the AC bus has power after 30 seconds, the auxiliary inverter SIV3 closes the load contactor KMA to complete the external output; the other auxiliary inverters SIV automatically complete the phase lock and then output to the outside.

[0077] After the train enters the "emergency traction mode", the emergency traction button is pressed again manually to cancel the emergency traction command. When the emergency traction command is canceled, all auxiliary inverters SIV disconnect the KMA contactors; after the network monitors that the KMA contactors of all auxiliary inverters SIV are disconnected, the bus contactor is reclosed and the grid-connected control is re-performed according to the method provided in the embodiment of the present application.

[0078] The following further describes an exemplary structure of the grid-connected control device 202 of the train auxiliary power supply system provided in the embodiment of the present application implemented as a software module. In some embodiments, for example Figure 2 As shown, the software modules stored in the grid-connected control device 2022 of the train auxiliary power supply system in the memory 202 may include:

[0079] The detection module 20221 is used to control the medium voltage bus controller to close when it is detected that the grid voltage signal of any auxiliary inverter SIV is greater than the voltage threshold and all the auxiliary inverter SIV output contactors KMA are in the disconnected state;

[0080] The sending module 20222 is used for sending a grid-connection instruction to the first auxiliary converter ACU after receiving a state signal fed back by the first auxiliary converter ACU, so that the first auxiliary converter ACU closes the output contactor KMA of the auxiliary inverter SIV, wherein the state signal is generated after the auxiliary inverter SIV is started, and the first auxiliary converter ACU is one of the at least one auxiliary converter ACU;

[0081] The receiving module 20223 is used to synchronize the AC bus voltages of other auxiliary converters ACU to complete grid-connected startup after receiving the feedback signal indicating successful grid connection sent by the first auxiliary converter ACU after closing the output contactor KMA.

[0082] In some embodiments, the sending module is also used to send a grid-connected instruction to the N+1th auxiliary converter ACU if no feedback signal from the Nth auxiliary converter ACU is received within the target time after sending the grid-connected instruction to the Nth auxiliary converter ACU, and stop sending the grid-connected instruction until the feedback signal is received, where N is a positive integer greater than or equal to 1.

[0083] In some embodiments, the device also includes: a load processing module, which is used to not reduce the train load if the at least two auxiliary converters ACU are successfully connected to the grid and started; if a first number of auxiliary converters ACU among the at least two auxiliary converters ACU fail to start up the grid, shut down the target second number of train loads.

[0084] In some embodiments, the load processing module is further used to assist the train in load reduction when a communication failure between the auxiliary converter ACU and the train control management system is detected.

[0085] In some embodiments, the device further includes: a short circuit processing module, configured to, when detecting that at least one of the at least two auxiliary inverters SIV has a short circuit, connect the short-circuited auxiliary inverter SIV to the grid and restart it.

[0086] It should be noted that the description of the device of the embodiment of the present application is similar to the description of the above-mentioned method embodiment, and has similar beneficial effects as the method embodiment, so it will not be repeated.

[0087] The embodiment of the present application provides a computer program product, which includes computer instructions, and the computer instructions are stored in a computer-readable storage medium. The processor of the computer device reads the computer instructions from the computer-readable storage medium, and the processor executes the computer instructions, so that the computer device executes the above-mentioned grid-connected control method of the train auxiliary power supply system in the embodiment of the present application.

[0088] An embodiment of the present application provides a computer-readable storage medium storing executable instructions, wherein executable instructions are stored. When the executable instructions are executed by a processor, the processor will execute the grid-connected control method of the train auxiliary power supply system provided in the embodiment of the present application.

[0089] In some embodiments, the computer-readable storage medium may be a memory such as FRAM, ROM, PROM, EPROM, EEPROM, flash memory, magnetic surface storage, optical disk, or CD-ROM; or it may be various devices including one or any combination of the above memories.

[0090] In some embodiments, executable instructions may be in the form of a program, software, software module, script or code, written in any form of programming language (including compiled or interpreted languages, or declarative or procedural languages), and may be deployed in any form, including as a stand-alone program or as a module, component, subroutine or other unit suitable for use in a computing environment.

[0091] As an example, executable instructions may, but need not, correspond to a file in a file system, may be stored as part of a file that stores other programs or data, such as in one or more scripts in a HyperText Markup Language (HTML) document, in a single file dedicated to the program in question, or in multiple coordinated files (e.g., files storing one or more modules, subroutines, or code portions).

[0092] By way of example, executable instructions may be deployed to be executed on one computing device, or on multiple computing devices located at one site, or on multiple computing devices distributed across multiple sites and interconnected by a communication network.

[0093] In summary, the embodiments of the present application can achieve fast and accurate grid connection control.

[0094] The above is only an embodiment of the present application and is not intended to limit the protection scope of the present application. Any modifications, equivalent substitutions and improvements made within the spirit and scope of the present application are included in the protection scope of the present application.

Claims

1. A grid-connected control method for a train auxiliary power supply system, characterized in that: The train auxiliary power supply system includes at least two auxiliary converters ACU, the auxiliary converter ACU includes an auxiliary inverter SIV, and the method includes: When it is detected that the grid voltage signal of any auxiliary inverter SIV is greater than the voltage threshold and all auxiliary inverter SIV output contactors KMA are in the disconnected state, the medium voltage bus controller is controlled to close; After receiving a state signal fed back by the first auxiliary converter ACU, sending a grid-connection instruction to the first auxiliary converter ACU so that the first auxiliary converter ACU closes the output contactor KMA of the auxiliary inverter SIV, wherein the state signal is generated after the auxiliary inverter SIV is started, and the first auxiliary converter ACU is one of the at least one auxiliary converter ACU; After receiving the feedback signal indicating successful grid connection sent by the first auxiliary converter ACU after closing the output contactor KMA, the AC bus voltages of other auxiliary converters ACU are synchronized to complete grid connection startup.

2. The method according to claim 1, characterized in that: The method further comprises: If no feedback signal of the Nth auxiliary converter ACU is received within the target time after sending the grid-connection instruction to the Nth auxiliary converter ACU, a grid-connection instruction is sent to the N+1th auxiliary converter ACU until a feedback signal is received, and the sending of the grid-connection instruction is stopped, where N is a positive integer greater than or equal to 1.

3. The method according to claim 1, characterized in that The method further comprises: If the at least two auxiliary converters ACU are both successfully connected to the grid and started, no load shedding is performed on the train load; If a first number of the at least two auxiliary converters ACU fail to start up in grid connection, a target second number of train loads is shut down.

4. The method according to claim 1, characterized in that The method further comprises: When a communication failure between the auxiliary converter ACU and the train control management system is detected, the train is assisted in load reduction.

5. The method according to claim 1, characterized in that The method further comprises: When it is detected that at least one of the at least two auxiliary inverters SIV is short-circuited, the short-circuited auxiliary inverter SIV is connected to the grid and restarted.

6. A grid-connected control device for a train auxiliary power supply system, characterized in that: The train auxiliary power supply system includes at least two auxiliary converters ACU, the auxiliary converter ACU includes an auxiliary inverter SIV, and the device includes: The detection module is used to control the medium voltage bus controller to close when it is detected that the grid voltage signal of any auxiliary inverter SIV is greater than the voltage threshold and all the auxiliary inverter SIV output contactors KMA are in the disconnected state; a sending module, configured to send a grid-connection instruction to the first auxiliary converter ACU after receiving a state signal fed back by the first auxiliary converter ACU, so that the first auxiliary converter ACU closes the output contactor KMA of the auxiliary inverter SIV, wherein the state signal is generated after the auxiliary inverter SIV is started, and the first auxiliary converter ACU is one of the at least one auxiliary converter ACU; The receiving module is used to synchronize the AC bus voltages of other auxiliary converters ACU to complete grid-connected startup after receiving the feedback signal indicating successful grid connection sent by the first auxiliary converter ACU after closing the output contactor KMA.

7. The device according to claim 1, characterized in that The sending module is also used to send a grid-connected instruction to the N+1th auxiliary converter ACU if no feedback signal of the Nth auxiliary converter ACU is received within the target time after the grid-connected instruction is sent to the Nth auxiliary converter ACU, and stop sending the grid-connected instruction until the feedback signal is received, where N is a positive integer greater than or equal to 1.

8. An electronic device, characterized in that: include: A memory for storing executable instructions; The processor is used to implement the grid-connected control method of the train auxiliary power supply system as described in any one of claims 1 to 5 when executing the executable instructions stored in the memory.

9. A computer-readable storage medium, characterized in that: Executable instructions are stored, which are used to implement the grid-connected control method of the train auxiliary power supply system as described in any one of claims 1 to 5 when executed by a processor.

10. A computer program product, characterized in that A computer program is stored, which is used to implement the grid-connected control method of the train auxiliary power supply system as described in any one of claims 1 to 5 when executed by a processor.

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