Auxiliary stopping device of current conversion equipment and current conversion equipment

Abstract

The present invention provides an auxiliary shutdown device for a converter device, wherein the converter device comprises a converter unit and an emergency shutdown device, wherein the emergency shutdown device comprises an emergency shutdown trigger unit, wherein in response to the emergency shutdown trigger unit being triggered, the emergency shutdown device disconnects the DC side and the AC side of the converter unit, and wherein the auxiliary shutdown device comprises: a control unit, wherein the control unit obtains a status signal of the emergency shutdown trigger unit, wherein in response to the status signal of the emergency shutdown trigger unit indicating that the emergency shutdown trigger unit is triggered, the control unit blocks a driving signal of the converter unit to control the safe shutdown of the converter unit and synchronously records the operation information and fault information of the converter unit; and an auxiliary power supply, wherein the auxiliary power supply is used to supply power to the control unit, wherein in response to the emergency shutdown trigger unit being triggered, the auxiliary power supply stops supplying power to the control unit after a preset time delay.

Description

Technical Field

[0001] The present invention relates to the field of power electronics, and in particular to an auxiliary shutdown device of a current converter and a current converter comprising the auxiliary shutdown device. Background Art

[0002] When power conversion equipment such as inverters, rectifiers or frequency converters encounter serious faults or extremely urgent situations, they need to be shut down immediately and safely to prevent the fault or situation from escalating. Emergency shutdown can minimize losses and dangers.

[0003] Existing converter equipment is generally equipped with an emergency stop device, and the converter equipment can be manually and quickly stopped by triggering the emergency stop device by triggering an emergency stop button.

[0004] Conventional emergency stop devices can generally be used to directly or indirectly control the emergency disconnection of the input and output ends of the converter unit in the converter equipment. After the emergency stop button is triggered, the emergency stop device cuts off the input and output ends of the converter unit, thereby achieving the purpose of emergency shutdown of the converter equipment.

[0005] The indirect shutdown solution is generally achieved by cutting off the control power supply. Cutting off the control power supply will cause the control unit of the converter equipment to lose power immediately. The loss of power to the control unit will cause the contactor or circuit breaker of the main circuit to trip, thereby causing an emergency shutdown. The direct shutdown solution is to directly disconnect the contactor or circuit breaker of the main circuit through the interlocking mechanism unit and the control circuit, thereby causing an emergency shutdown.

[0006] From the above indirect shutdown method or direct shutdown scheme, it can be seen that the existing emergency shutdown scheme is simple and crude, and both are means to directly cut off the control power supply and the main circuit. Directly cutting off the control power supply will threaten the control unit in the converter equipment to execute fault recording and the safe operation of the system when the power is off; directly disconnecting the contactor or circuit breaker of the main circuit cannot guarantee the control unit in the converter equipment to execute fault recording and the safe operation of the system when the power is off.

[0007] In order to solve the above problems, the present invention aims to provide an auxiliary shutdown device for a converter device, which can assist the converter device in safely shutting down and simultaneously complete the recording of operating information and fault information after the emergency shutdown device is triggered. Summary of the invention

[0008] A brief summary of one or more aspects is given below to provide a basic understanding of these aspects. This summary is not an exhaustive overview of all conceived aspects, and is neither intended to identify the key or critical elements of all aspects nor to define the scope of any or all aspects. Its only purpose is to give some concepts of one or more aspects in a simplified form as a prelude to a more detailed description that will be given later.

[0009] According to one aspect of the present invention, there is provided an auxiliary shutdown device of a converter device, the converter device comprising a converter unit and an emergency shutdown device, the emergency shutdown device comprising an emergency shutdown trigger unit, in response to the emergency shutdown trigger unit being triggered, the emergency shutdown device disconnects the DC side and the AC side of the converter unit, the auxiliary shutdown device comprising: a control unit, the control unit acquiring a status signal of the emergency shutdown trigger unit, in response to the status signal of the emergency shutdown trigger unit indicating that the emergency shutdown trigger unit is triggered, the control unit blocking a drive signal of the converter unit to control the converter unit to shut down safely and synchronously record operating information and fault information of the converter unit; and an auxiliary power supply for supplying power to the control unit, in response to the emergency shutdown trigger unit being triggered, the auxiliary power supply stops supplying power to the control unit after a preset time delay.

[0010] Furthermore, the auxiliary power supply is a capacitor or an energy storage device.

[0011] Furthermore, the converter device also includes a DC support capacitor, which is connected across the DC end of the converter unit. The auxiliary power supply is a distribution unit. The input end of the auxiliary power supply is connected across the two ends of the DC support capacitor to draw power from the DC side of the converter unit. In response to the emergency shutdown trigger unit being triggered, the auxiliary power supply consumes the remaining power on the DC support capacitor to supply power to the control unit for the preset time.

[0012] Furthermore, the DC end of the auxiliary power supply is also bridged to the AC end of the converter unit to obtain power from the AC side of the converter unit.

[0013] Furthermore, the emergency stop device also includes a DC side distribution unit and an AC side distribution unit, the DC side distribution unit is connected to the DC end of the converter unit to control the conduction or disconnection of the DC side of the converter unit, and the AC side distribution unit is connected to the AC end of the converter unit to control the conduction or disconnection of the AC side of the converter unit, the DC side distribution unit and the AC side distribution unit are disconnected in response to the emergency stop trigger unit being triggered, and the auxiliary power supply is linked with the emergency stop trigger unit, the DC side distribution unit and the AC side distribution unit through a linkage mechanism, and in response to the emergency stop trigger unit being triggered, the linkage mechanism is linked to disconnect the DC side distribution unit and the AC side distribution unit.

[0014] Furthermore, the linkage mechanism includes a first shunt release, a second separation release and an intermediate action mechanism, the first shunt release and the second shunt release are respectively arranged in the DC side distribution unit and the AC side distribution unit to respectively trigger the disconnection of the DC side distribution unit and the AC side distribution unit, the auxiliary power supply is connected to the coils of the first shunt release and the second shunt release through the intermediate action mechanism, in response to the emergency shutdown trigger unit being triggered, the intermediate action mechanism is closed so that the auxiliary power supply supplies power to the coils of the first shunt release and the second shunt release, and the DC side distribution unit and the AC side distribution unit are disconnected.

[0015] Furthermore, the intermediate action mechanism is a relay or a contactor, the auxiliary power supply is connected to the coil of the intermediate action mechanism through the emergency stop trigger unit, and the auxiliary power supply is also connected to the coils of the first shunt release and the second shunt release through the normally open switch of the intermediate action mechanism. In response to the emergency stop trigger unit being triggered, the auxiliary power supply supplies power to the coil of the intermediate action mechanism, and the normally open switch of the intermediate action mechanism is closed so that the auxiliary power supply supplies power to the coils of the first shunt release and the second shunt release.

[0016] Furthermore, the control unit is an original control unit of the converter device.

[0017] Furthermore, the control unit is a processor.

[0018] According to another aspect of the present invention, a converter device is also provided, which includes a converter unit, an emergency stop device and the auxiliary stop device described in any one of the above items, the emergency stop device is used to achieve emergency disconnection of the DC end and the AC end of the converter unit, and the auxiliary stop device is used to assist the emergency stop device to control the safe shutdown of the converter unit and synchronously record the operating information and fault information of the converter unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above features and advantages of the present invention will be better understood after reading the detailed description of the embodiments of the present disclosure in conjunction with the following drawings.

[0020] Figure 1 is a schematic structural diagram of a current conversion device in an embodiment according to one aspect of the present invention;

[0021] Figure 2 is a schematic structural diagram of a current conversion device in another embodiment according to another aspect of the present invention;

[0022] Figure 3is a schematic structural diagram of a current conversion device in another embodiment according to another aspect of the present invention;

[0023] Figure 4 is a schematic structural diagram of a current conversion device in another embodiment according to another aspect of the present invention;

[0024] Figure 5 is a schematic structural diagram of a linkage mechanism in another embodiment according to another aspect of the present invention.

[0025] For the sake of clarity, a brief description of the reference numerals is given below:

[0026] 110 Converter Unit

[0027] 120 Emergency stop device

[0028] 121 Emergency stop trigger unit

[0029] 122 DC side power distribution unit

[0030] 123 AC side power distribution unit

[0031] 130 Auxiliary stop device

[0032] 131 Control unit

[0033] 132 Auxiliary power supply

[0034] 140 DC support capacitor

[0035] 151 First shunt release

[0036] 152 Second shunt release

[0037] 153 Intermediate Action Mechanism DETAILED DESCRIPTION

[0038] The following description is given to enable those skilled in the art to implement and use the invention and incorporate it into a specific application context. Various modifications, as well as various uses in different applications will be readily apparent to those skilled in the art, and the general principles defined herein are applicable to a wide range of embodiments. Thus, the present invention is not limited to the embodiments given herein, but should be granted the broadest scope consistent with the principles and novel features disclosed herein.

[0039] In the following detailed description, many specific details are set forth to provide a more thorough understanding of the present invention. However, it will be apparent to those skilled in the art that the practice of the present invention need not be limited to these specific details. In other words, known structures and devices are shown in block diagram form without detailed display to avoid obscuring the present invention.

[0040] The reader is reminded of all documents and literature filed simultaneously with this specification and open to public inspection, and the contents of all such documents and literature are incorporated herein by reference. Unless otherwise directly stated, all features disclosed in this specification (including any attached claims, abstracts and drawings) can be replaced by alternative features for achieving the same, equivalent or similar purposes. Therefore, unless otherwise explicitly stated, each feature disclosed is only an example of a group of equivalent or similar features.

[0041] Note that, where used, the symbols left, right, front, back, top, bottom, forward, reverse, clockwise and counterclockwise are used only for convenience and do not imply any specific fixed direction. In fact, they are used to reflect the relative position and / or direction between the various parts of the object. In addition, the terms "first" and "second" are used only for descriptive purposes and should not be understood as indicating or implying relative importance.

[0042] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0043] Note that, in the case of use, further, preferably, further and more preferably are simple beginnings for explaining another embodiment based on the previous embodiment, and the content of further, preferably, further or more preferably followed by the above embodiment is combined with the previous embodiment as a complete composition of another embodiment. Several further, preferably, further or more preferably settings followed by the same embodiment can be arbitrarily combined to form another embodiment.

[0044] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. Note that the aspects described below in conjunction with the accompanying drawings and specific embodiments are only exemplary and should not be construed as limiting the scope of protection of the present invention in any way.

[0045] In order to facilitate understanding of the inventive concept of the present invention, a converter device and an emergency shutdown device of the converter device in the prior art are briefly introduced first.

[0046] The current conversion device described in the present invention refers to a device including a current conversion unit, wherein the current conversion unit refers to a circuit that converts AC power into DC power or DC power into AC power, and may include an inverter circuit and a rectifier circuit, etc. Correspondingly, the current conversion device may include but is not limited to an inverter, a rectifier, and a frequency converter.

[0047] Generally speaking, one end of the converter is connected to a power supply grid, and the other end is connected to a load. The power supply grid may be a DC power supply grid or an AC power supply grid, and the load may be an AC load or a DC load. Therefore, the present invention refers to the two ports of the converter unit as a DC end and an AC end, respectively, and does not limit whether the DC end or the AC end is used as the input end or the output end of the converter unit.

[0048] That is, the DC end of the converter device can be used as the input end or the output end, and the corresponding AC end is the output end or the input end. For example, for an inverter, the power supply grid of the converter unit is a DC power supply grid, and the DC end of the converter unit is connected to the DC power supply grid, that is, the DC end serves as the input end of the converter unit, and the AC end of the converter unit is connected to the AC load; for a rectifier, the power supply grid of the converter unit is an AC power supply grid, and the AC end of the converter unit is connected to the AC power supply grid, that is, the AC end serves as the input end of the converter unit, and the DC end of the converter unit is connected to the DC load.

[0049] Generally, the emergency shutdown device may include an emergency shutdown trigger unit, a DC side distribution unit, and an AC side distribution unit. The DC end of the converter unit is connected to the DC power supply network or DC load through the DC side distribution unit, and the AC end of the converter unit is connected to the AC load or AC power supply network through the AC distribution unit. When the converter equipment is working normally, the DC side distribution unit and the AC side distribution unit are in a conducting state, and the DC end and AC end of the converter unit are in a connected state with the corresponding power grid or load. The emergency shutdown trigger unit may have a linkage mechanism that is linked with the DC side distribution unit and the AC side distribution unit. In response to the emergency shutdown trigger unit being triggered, the DC side distribution unit and the AC side distribution unit are switched from the conducting state to the disconnected state, and the DC end and AC end of the converter unit are disconnected from the corresponding power grid or load, thereby realizing the emergency shutdown of the converter equipment.

[0050] The emergency stop trigger unit may be a conventional manual trigger button or a virtual key or other device that can realize control signal input. The DC side distribution unit and the AC side distribution unit may be devices such as contactors or circuit breakers that can realize circuit closing or opening.

[0051] According to one aspect of the present invention, an auxiliary shutdown device for a converter device and a converter device including the auxiliary shutdown device are provided. The auxiliary shutdown device can prevent system safety problems and loss of operation information and fault information caused by sudden power failure caused by the emergency shutdown mechanism of the emergency shutdown device.

[0052] like Figure 1 As shown, the converter device includes a converter unit 110 , an emergency stop device 120 and an auxiliary stop device 130 .

[0053] The emergency stop device 120 includes an emergency stop trigger unit 121. In response to the emergency stop trigger unit 121 being triggered, the emergency stop device 120 disconnects the DC side and the AC side of the converter unit 110, that is, disconnects the converter unit 110 from the power supply grid and the load.

[0054] The auxiliary stopping device 130 includes a control unit 131 and an auxiliary power source 132 .

[0055] The control unit 131 can be connected to the driving end of the converter unit 110 in a direct or indirect manner to control the driving signal of the converter unit 110. The control unit 131 can also obtain the state signal of the emergency stop trigger unit 121, and in response to the state signal indicating that the emergency stop trigger unit 121 is triggered, the control unit 131 blocks the driving signal of the converter unit 110 to control the converter unit 110 to shut down safely and simultaneously record the operation information and fault information of the converter unit 110.

[0056] The auxiliary power supply 132 is used to supply power to the control unit 131 to support the operation of the control unit 131. In response to the emergency stop trigger unit 121 being triggered, the auxiliary power supply 132 stops supplying power to the control unit 131 after a preset time delay.

[0057] The preset time is greater than or equal to the time required for the control unit 131 to block the driving signal of the converter unit 110 and to record the operation information and fault information of the converter unit 110 .

[0058] The auxiliary power supply 132 may be an existing or future energy storage device or capacitor, etc. It is understandable that based on different implementations of the auxiliary power supply 132 , different other units or modules may be configured as needed to realize the function of linkage with the emergency stop trigger unit 121 .

[0059] In one embodiment, the auxiliary power supply 132 is a conventional energy storage device. The auxiliary power supply 132 may be configured with a unit having a timing function, and the unit having the timing function may at least complete the timing of the above-mentioned preset time. The emergency stop trigger unit 121 may be connected to the timing unit of the auxiliary power supply 132, and in response to the emergency stop trigger unit 121 being triggered, the timing unit of the auxiliary power supply 132 is started, and the auxiliary power supply 132 may continue to supply power to the control unit 131 within the preset time.

[0060] In another embodiment, the auxiliary power supply 132 is a capacitor, and the capacitor can maintain the power supply voltage for at least the above preset time after being fully charged. Under normal conditions, the two ends of the auxiliary power supply 132 are normally connected to a power supply end, and the auxiliary power supply 132 and the power supply end can be connected through a switch device, and the emergency stop trigger unit 121 can have a linkage relationship with the switch device, then in response to the emergency stop trigger unit 121 being triggered, the switch device is disconnected, and the auxiliary power supply 132 consumes its remaining power to supply power to the control unit 131. When the remaining power is consumed or the voltage at both ends of the auxiliary power supply is less than the power supply voltage of the control unit 131, the control unit 131 is powered off and shut down. It can be understood that the duration for which the auxiliary power supply 132 can maintain the operation of the control unit 131 is related to the voltage of the power supply end of the auxiliary power supply 132 and the capacity of the capacitor, so the voltage of the power supply end and the capacity of the capacitor can be set based on the preset time.

[0061] In a more preferred embodiment, the auxiliary power supply 132 is a power distribution unit, that is, it has the function of converting the input voltage into the working voltage of the control unit 131. Correspondingly, the input end of the auxiliary power supply 132 is connected across the two ends of the DC support capacitor 140 in the converter device, such as Figure 2 As shown, the DC support capacitor 140 is connected across the DC end of the converter unit 110. Then, the auxiliary power supply 132 draws power from the DC side of the converter unit 110. When the DC side and AC side of the converter unit are input or output, the auxiliary power supply 132 can consume the remaining power on the DC support capacitor 140 to supply power to the control unit 110 for a preset time. When the remaining power on the DC support capacitor 140 is consumed, the control unit 131 has completed the work of recording the operation information and fault information of the converter unit 110 and controlling the safe shutdown of the converter unit. At this time, the control unit 131 will also stop working, so that the entire converter equipment is safely and reliably shut down, disconnected from the outside and completely powered off.

[0062] Those skilled in the art can understand that the DC support capacitor is a conventional component in the converter device, and the setting that the auxiliary power supply 132 draws power from the conventional component in the converter device can reduce the device scale of the converter device and save costs.

[0063] Furthermore, the control unit 131 may be an original control module of the converter device, and the auxiliary power supply 132 may also be a power supply of the original control module of the converter device.

[0064] In a more preferred embodiment, Figure 3 As shown, the auxiliary power supply 132 can have both AC and DC power distribution functions, that is, the auxiliary power supply 132 can also convert the AC power at the input end into the working voltage required by the control unit 131 and transmit it to the control unit 131. Furthermore, the input end of the auxiliary power supply 132 can also cross the AC end of the converter unit 110 at the same time to draw power from the AC side of the converter unit 110. Then, when the converter device is in normal working state, when the connection between the auxiliary power supply 132 and any side (the DC side or the AC side of the converter unit 110) fails, such as disconnection, the auxiliary power supply 132 can still output the power supply voltage of the control unit 131 normally to ensure the normal operation of the control unit 131.

[0065] Furthermore, in order to improve the response time between the emergency stop device 120 and the auxiliary stop device 130, a linkage mechanism may be provided between the emergency stop mechanism 120 and the auxiliary stop device 130 to achieve a rapid response from the emergency stop to the auxiliary stop.

[0066] Those skilled in the art can understand that the linkage mechanism can be implemented by conventional electronic devices with linkage functions, such as any combination of shunt release, undervoltage release, electric opening coil, contactor, relay, IO interface or other linkage switches. The linkage mechanism in a specific embodiment is described below by taking the shunt release as an example.

[0067] Specific examples include Figure 4 As shown, the emergency shutdown device 120 further includes a DC side power distribution unit 122 and an AC side power distribution unit 123 .

[0068] The DC side power distribution unit 122 is connected to the DC end of the converter unit 110 to control the on or off of the DC side of the converter unit 110 .

[0069] The AC side power distribution unit 123 is connected to the AC end of the converter unit 110 to control the on or off of the AC side of the converter unit 110 .

[0070] The DC side power distribution unit 122 and the AC side power distribution unit 123 have a linkage relationship with the emergency shutdown trigger unit 121. In response to the emergency shutdown trigger unit 121 being triggered, the DC side power distribution unit 122 and the AC side power distribution unit 123 are disconnected so that the DC end and the AC end of the converter unit 110 are respectively disconnected from the power supply grid or the load of the converter device.

[0071] Furthermore, the auxiliary power supply 132 can realize a linkage relationship with the emergency shutdown trigger unit 121, the DC side distribution unit 122 and the AC side distribution unit 123 through an existing or future linkage mechanism. In response to the emergency shutdown trigger unit 121 being triggered, the linkage mechanism generates a linkage action to disconnect the DC side distribution unit 122 and the AC side distribution unit 123.

[0072] Specifically, Figure 5 As shown, the linkage mechanism may include a first shunt release 151 , a second separation release 152 and an intermediate action mechanism 153 .

[0073] The first shunt release 151 is disposed in the DC side power distribution unit 122 to trigger the disconnection of the DC side power distribution unit 122. The second shunt release 152 is disposed in the AC side power distribution unit 123 to trigger the disconnection of the AC side power distribution unit 123.

[0074] The auxiliary power supply 132 is connected to the coils of the first shunt release 151 and the second shunt release 152 through the intermediate action mechanism 153. In response to the emergency shutdown trigger unit 121 being triggered, the intermediate action mechanism 153 is closed so that the auxiliary power supply 132 supplies power to the coils of the first shunt release 151 and the second shunt release 152, thereby triggering the DC side distribution unit 122 and the AC side distribution unit 123 to disconnect.

[0075] Furthermore, the intermediate action mechanism 153 may be a relay or a contactor. Figure 5 As shown, the auxiliary power supply 132 is connected to the coil of the intermediate action mechanism 153 through the emergency stop trigger unit 121, and the auxiliary power supply 132 is connected to the coils of the first shunt release 151 and the second shunt release 152 through the normally open switch of the intermediate action mechanism 153.

[0076] Then, in response to the emergency shutdown trigger unit 121 being triggered, the auxiliary power supply 132 supplies power to the coil of the intermediate action mechanism 153, triggering the normally open switch of the intermediate action mechanism 153 to close so that the auxiliary power supply 132 supplies power to the coils of the first shunt release 151 and the second shunt release 152, thereby triggering the DC side distribution unit 122 and the AC side distribution unit 123 to disconnect.

[0077] Although Figure 5 A relay or a contactor is used as an example of the intermediate action mechanism, but in other embodiments, the intermediate action mechanism 153 may also be a digital output interface on the control unit 151 or other control panels.

[0078] Those skilled in the art can understand that, although the above embodiments take the normally open switch of the shunt release, relay or contactor as an example, based on different circuit structure designs and the selection of different linkage devices, the linkage mechanism can also be implemented by other corresponding combinations. For example, when an electric opening coil is used as the linkage switch device of the DC side distribution unit 122 and the AC side distribution unit 123, the corresponding intermediate action mechanism 153 can be implemented by the normally open contact of the relay or contactor; when an undervoltage release is used as the linkage switch device of the DC side distribution unit 122 and the AC side distribution unit 123, the corresponding intermediate action mechanism 153 can be implemented by the normally closed contact of the relay or contactor.

[0079] Furthermore, if Figure 5 The emergency shutdown process of the converter equipment shown is as follows:

[0080] The emergency stop trigger unit 121 is triggered, the connection circuit between the auxiliary power supply 132 and the coil of the intermediate action mechanism 132 is energized, the normally open switch of the intermediate action mechanism 132 is closed, and the connection circuit between the auxiliary power supply 132 and the coils of the first shunt release 151 and the second shunt release 152 is energized, triggering the DC side distribution unit 122 and the AC side distribution unit 123 to be disconnected, so that the DC end and the AC end of the converter unit 110 are respectively disconnected from the power supply grid or the load;

[0081] At the same time, the control unit 131 receives the status signal of the emergency shutdown trigger unit 121, and determines that the status signal indicates that the emergency shutdown trigger unit 121 is triggered. The control unit 131 immediately blocks the drive signal of the converter unit 110 so that the converter unit 110 shuts down safely and reliably, and simultaneously records and stores the current operation information and fault information.

[0082] Since the execution action of the control unit 131 is faster than the response action of the linkage mechanism, the control unit 131 blocks the driving signal of the converter unit 110 earlier than the complete response time of the linkage mechanism, thereby enabling the converter unit 110 to shut down safely and reliably.

[0083] The remaining power on the DC link capacitor 140 can keep the control unit 131 working for a certain period of time, so the control unit 131 is sufficient to perform the action of recording and storing the current operation information and fault information.

[0084] Those skilled in the art will appreciate that information, signals, and data may be represented using any of a variety of different technologies and techniques. For example, data, instructions, commands, information, signals, bits, symbols, and chips cited throughout the above description may be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, optical fields or optical particles, or any combination thereof.

[0085] Those skilled in the art will further appreciate that the various illustrative logic blocks, modules, circuits, and algorithm steps described in conjunction with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or a combination of the two. To clearly illustrate this interchangeability of hardware and software, various illustrative components, blocks, modules, circuits, and steps are generally described above in terms of their functionality. Whether such functionality is implemented as hardware or software depends on the specific application and the design constraints imposed on the overall system. The technician may implement the described functionality in different ways for each specific application, but such implementation decisions should not be interpreted as resulting in a departure from the scope of the present invention.

[0086] The various illustrative logic modules and circuits described in conjunction with the embodiments disclosed herein may be implemented or executed with a general purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. A general purpose processor may be a microprocessor, but in the alternative, the processor may be any conventional processor, controller, microcontroller, or state machine. The processor may also be implemented as a combination of computing devices, such as a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in cooperation with a DSP core, or any other such configuration.

[0087] The steps of the method or algorithm described in conjunction with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. The software module may reside in a RAM memory, a flash memory, a ROM memory, an EPROM memory, an EEPROM memory, a register, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art. An exemplary storage medium is coupled to a processor so that the processor can read and write information from / to the storage medium. In an alternative, a storage medium may be integrated into a processor. The processor and the storage medium may reside in an ASIC. The ASIC may reside in a user terminal. In an alternative, the processor and the storage medium may reside in a user terminal as discrete components.

[0088] In one or more exemplary embodiments, the functions described may be implemented in hardware, software, firmware, or any combination thereof. If implemented as a computer program product in software, each function may be stored on or transmitted by a computer-readable medium as one or more instructions or codes. Computer-readable media include both computer storage media and communication media, including any medium that facilitates the transfer of a computer program from one place to another. Storage media may be any available medium that can be accessed by a computer. As an example and not limitation, such a computer-readable medium may include RAM, ROM, EEPROM, CD-ROM or other optical disk storage, disk storage or other magnetic storage device, or any other medium that can be used to carry or store the desired program code in the form of an instruction or data structure and can be accessed by a computer. Any connection is also properly referred to as a computer-readable medium. For example, if the software is transmitted from a website, a server, or other remote source using a coaxial cable, a fiber optic cable, a twisted pair, a digital subscriber line (DSL), or wireless technologies such as infrared, radio, and microwaves, the coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwaves are included in the definition of the medium. Disk and disc as used herein include compact disc (CD), laser disc, optical disc, digital versatile disc (DVD), floppy disk and Blu-ray disc, wherein disk often reproduces data magnetically, while disc reproduces data optically with lasers. Combinations of the above should also be included within the scope of computer-readable media.

[0089] The foregoing description is provided to enable any person skilled in the art to practice the various aspects described herein. However, it should be understood that the scope of protection of the present invention shall be subject to the appended claims and shall not be limited to the specific structures and components of the above-described embodiments. Those skilled in the art may make various changes and modifications to the embodiments within the spirit and scope of the present invention, and these changes and modifications also fall within the scope of protection of the present invention.

Claims

1. An auxiliary shutdown device for a converter device, the converter device comprising a converter unit and an emergency shutdown device, the emergency shutdown device comprising an emergency shutdown trigger unit, a DC side distribution unit and an AC side distribution unit, the DC side distribution unit is connected to the DC end of the converter unit to control the conduction or disconnection of the DC side of the converter unit, the AC side distribution unit is connected to the AC end of the converter unit to control the conduction or disconnection of the AC side of the converter unit, the DC side distribution unit and the AC side distribution unit are disconnected in response to the emergency shutdown trigger unit being triggered, The auxiliary stopping device comprises: A control unit, wherein the control unit obtains a status signal of the emergency stop trigger unit, and in response to the status signal of the emergency stop trigger unit indicating that the emergency stop trigger unit is triggered, the control unit blocks a drive signal of the converter unit to control the converter unit to shut down safely and simultaneously records operation information and fault information of the converter unit; as well as an auxiliary power supply for supplying power to the control unit, wherein the auxiliary power supply is linked with the emergency stop trigger unit, the DC side power distribution unit and the AC side power distribution unit through a linkage mechanism; in response to the emergency stop trigger unit being triggered, the linkage mechanism is linked to disconnect the DC side power distribution unit and the AC side power distribution unit, and the auxiliary power supply stops supplying power to the control unit after a preset time delay; wherein the linkage mechanism comprises a first shunt release, a second shunt release and an intermediate action mechanism; the first shunt release and the second shunt release are respectively arranged in the DC side power distribution unit and the AC side power distribution unit to respectively trigger the disconnection of the DC side power distribution unit and the AC side power distribution unit; the auxiliary power supply is connected with the coils of the first shunt release and the second shunt release through the intermediate action mechanism; in response to the emergency stop trigger unit being triggered, the intermediate action mechanism is closed to enable the auxiliary power supply to supply power to the coils of the first shunt release and the second shunt release, and the DC side power distribution unit and the AC side power distribution unit are disconnected.

2. The auxiliary stopping device according to claim 1, characterized in that: The auxiliary power supply is an energy storage device, wherein the energy storage device includes a capacitor.

3. The auxiliary stopping device according to claim 1, characterized in that: The current conversion device further includes a DC support capacitor, which is connected across the DC end of the current conversion unit. The auxiliary power supply is a power distribution unit, and the input end of the auxiliary power supply is connected across the two ends of the DC support capacitor to draw power from the DC side of the converter unit. In response to the emergency shutdown trigger unit being triggered, the auxiliary power supply consumes the remaining power on the DC support capacitor to supply power to the control unit for the preset time.

4. The auxiliary stopping device according to claim 3, characterized in that: The DC end of the auxiliary power supply is also connected across the AC end of the converter unit to obtain power from the AC side of the converter unit.

5. The auxiliary stopping device according to claim 1, characterized in that: The intermediate action mechanism is a relay or a contactor, the auxiliary power supply is connected to the coil of the intermediate action mechanism through the emergency stop trigger unit, and the auxiliary power supply is also connected to the coils of the first shunt release and the second shunt release through the normally open switch of the intermediate action mechanism. In response to the emergency stop trigger unit being triggered, the auxiliary power supply supplies power to the coil of the intermediate action mechanism, and the normally open switch of the intermediate action mechanism is closed so that the auxiliary power supply supplies power to the coils of the first shunt release and the second shunt release.

6. The auxiliary stopping device according to any one of claims 1 to 5, characterized in that: The control unit is an original control unit of the converter device.

7. The auxiliary stopping device according to any one of claims 1 to 5, characterized in that: The control unit is a processor.

8. A current conversion device, characterized in that: The converter device includes a converter unit, an emergency stop device, and an auxiliary stop device as described in any one of claims 1 to 7, wherein the emergency stop device is used to realize emergency disconnection of the DC end and the AC end of the converter unit, and the auxiliary stop device is used to assist the emergency stop device to control the safe shutdown of the converter unit and synchronously record the operation information and fault information of the converter unit.

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