Reference voltage selection method, device, equipment and system
By identifying the status of the line isolating switch, the phase-selecting switch device automatically selects the reference voltage, which solves the problem of different sources in the converter station with the system voltage and the interval voltage, reduces the impact of excitation inrush current on the converter transformer, and improves the safety of the equipment and stable operation.
Patent Information
- Application Number
- CN202411385383.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-30
- Publication Date
- 2025-01-03
AI Technical Summary
In a converter station with a 3/2 wiring method configured with a line isolating switch, the system voltage and this interval voltage cannot always remain the same, resulting in the inability to automatically select the optimal reference voltage, affecting the safe and stable operation of the equipment.
By identifying the status of the line isolating switch, the phase-selecting closing device can automatically select the line voltage or bus voltage as the reference voltage to reduce the impact of the excitation inrush current on the converter transformer.
It realizes automatic selection of reference voltage under different operating modes, reduces the impact of excitation inrush current on the converter transformer, and improves the safe and stable operation of the equipment.
Smart Images
Figure CN119253526A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of power systems, and in particular to a method, device, equipment and system for selecting a reference voltage. Background Art
[0002] In modern power systems, substations and converter stations are important hubs for power supply and power conversion. Due to their inherent physical characteristics, converter transformers in converter stations may generate inrush current or operational overvoltage during switching.
[0003] In order to avoid threats to the safe and stable operation of the entire system and equipment in the station, converter stations usually use phase-selective closing devices to control the opening and closing phases of circuit breakers. To a certain extent, this can effectively suppress the occurrence of transient processes such as excitation surge current and overvoltage, thereby providing technical guarantees for the safe and reliable commissioning of equipment.
[0004] However, the 3 / 2 wiring method of configuring the line disconnector outside the string, due to its flexible operation mode, causes the system voltage and the voltage of this interval to not always remain the same source, especially when the line disconnector is in the open position, it is impossible to automatically select the optimal reference voltage.
[0005] Therefore, there is an urgent need for a reference voltage determination method for a phase selection and closing device of a converter station that is suitable for a 3 / 2 wiring mode configured with a line disconnector. Summary of the invention
[0006] The present invention provides a method, device, equipment and system for selecting a reference voltage. By identifying whether a line disconnector is configured and the position of the line disconnector, a phase selection closing device can automatically select the line voltage or the bus voltage as the reference voltage, thereby reducing the influence of the excitation surge current on the converter transformer under different operating modes.
[0007] In a first aspect, an embodiment of the present invention provides a reference voltage selection method applicable to a reference voltage selection system, wherein the reference voltage selection system comprises: a first circuit breaker, a second circuit breaker, a third circuit breaker, a converter transformer, and a phase selection closing device;
[0008] The first circuit breaker is connected in series between the first bus and the converter transformer, the second circuit breaker is connected in series between the converter transformer and the high-voltage line, and the third circuit breaker is connected in series between the high-voltage line and the second bus;
[0009] The phase selection and closing device is connected to the first circuit breaker, the second circuit breaker and the third circuit breaker;
[0010] The method for selecting the reference voltage includes:
[0011] Identifying whether the high-voltage line is equipped with a line isolating switch;
[0012] If it is identified that the high-voltage line is equipped with a line isolating switch, identifying the state of the line isolating switch;
[0013] If it is identified that the line disconnector is in an open state, the reference voltage is selected as an adjacent bus voltage, and the adjacent bus voltage is the voltage of the first bus or the voltage of the second bus.
[0014] Optionally, after identifying whether the high-voltage line is equipped with a line isolating switch, the method further includes:
[0015] If it is identified that the high-voltage line is not equipped with a line isolating switch, the reference voltage is selected as the line voltage, and the line voltage is the voltage of the high-voltage line.
[0016] Optionally, if it is identified that the high-voltage line is equipped with a line isolating switch, after identifying the state of the line isolating switch, the method further includes:
[0017] If it is identified that the line isolating switch is in a closed state, the reference voltage is selected as the line voltage.
[0018] In a second aspect, an embodiment of the present invention further provides a reference voltage selection device, comprising:
[0019] A line isolating switch identification module is used to identify whether a high-voltage line is equipped with a line isolating switch;
[0020] A line isolating switch state identification module, used for identifying the state of the line isolating switch if the line isolating switch identification module identifies that the high-voltage line is equipped with a line isolating switch;
[0021] The reference voltage selection module is used to select the reference voltage as the adjacent bus voltage if the line disconnector state identification module identifies that the line disconnector is in the disconnected state, and the adjacent bus voltage is the voltage of the first bus or the voltage of the second bus.
[0022] Optionally, the reference voltage selection module is further used to select the reference voltage as the line voltage if the line isolating switch identification module identifies that the high-voltage line is not equipped with a line isolating switch, and the line voltage is the voltage of the high-voltage line.
[0023] Optionally, the reference voltage selection module is further configured to select the reference voltage as the line voltage if the line isolating switch state identification module identifies that the line isolating switch is in a closed state.
[0024] In a third aspect, an embodiment of the present invention further provides a reference voltage selection device, the reference voltage selection device comprising: at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores a computer program executable by the at least one processor, and the computer program is executed by the at least one processor so that the at least one processor can execute the reference voltage selection method as described in the first aspect.
[0025] In a fourth aspect, an embodiment of the present invention further provides a reference voltage selection system, comprising: the reference voltage selection device as described in the third aspect, a first circuit breaker, a second circuit breaker, a third circuit breaker, a converter transformer, and a phase selection closing device;
[0026] The first circuit breaker is connected in series between the first bus and the converter transformer, the second circuit breaker is connected in series between the converter transformer and the high-voltage line, and the third circuit breaker is connected in series between the high-voltage line and the second bus;
[0027] The phase selection and closing device is connected to the first circuit breaker, the second circuit breaker and the third circuit breaker.
[0028] Optionally, it also includes: a first bus voltage transformer, a second bus voltage transformer, a line voltage transformer and a plurality of isolating switches;
[0029] The first bus voltage transformer is configured on the first bus; the second bus voltage transformer is configured on the second bus; the line voltage transformer is configured on the high-voltage line;
[0030] The isolating switch is connected in series at both ends of the first circuit breaker, the second circuit breaker and the third circuit breaker.
[0031] Optionally, it also includes: a line isolating switch;
[0032] The line isolating switch is connected in series to the high-voltage line, and the line isolating switch is located between the line voltage transformer, the second circuit breaker and the third circuit breaker.
[0033] The present invention provides a method, device, equipment and system for selecting a reference voltage, the method comprising: identifying whether a high-voltage line is equipped with a line disconnector; if it is identified that the high-voltage line is equipped with a line disconnector, then identifying the state of the line disconnector; if it is identified that the line disconnector is in an open state, then selecting the reference voltage as the adjacent bus voltage, the adjacent bus voltage being the voltage of the first bus or the voltage of the second bus. In the embodiment of the present invention, by identifying whether a line disconnector is configured and the position of the line disconnector, the phase selection and closing device can automatically select the line voltage or the bus voltage as the reference voltage, thereby reducing the influence of the excitation inrush current on the converter transformer under different operating modes.
[0034] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS
[0035] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.
[0036] Figure 1 A schematic diagram of the structure of a reference voltage selection system provided by an embodiment of the present invention;
[0037] Figure 2 A flow chart of a method for selecting a reference voltage provided by an embodiment of the present invention;
[0038] Figure 3 A flow chart of another method for selecting a reference voltage provided by an embodiment of the present invention;
[0039] Figure 4 A schematic diagram of the structure of a reference voltage selection device provided by an embodiment of the present invention;
[0040] Figure 5 A schematic diagram of the structure of a reference voltage selection device provided by an embodiment of the present invention. DETAILED DESCRIPTION
[0041] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.
[0042] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention 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 interchanged where appropriate, so that the embodiments of the present invention 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.
[0043] Figure 1 A schematic diagram of a reference voltage selection system provided by an embodiment of the present invention, referring to Figure 1 The system includes: a first circuit breaker S1, a second circuit breaker S2, a third circuit breaker S3, a converter transformer 110 and a phase selection closing device 120; the first circuit breaker S1 is connected in series between the first bus 1M and the converter transformer 110, the second circuit breaker S2 is connected in series between the converter transformer 110 and the high-voltage line L, and the third circuit breaker S3 is connected in series between the high-voltage line L and the second bus 2M; the phase selection closing device 120 is connected to the first circuit breaker S1, the second circuit breaker S2 and the third circuit breaker S3.
[0044] It is understandable that for a 500kV AC field, a 3 / 2 wiring method is generally adopted, including two busbars, two busbar side circuit breakers and one circuit breaker, a total of three circuit breakers. Each circuit breaker is equipped with a phase selection closing device. The high-voltage line L in the embodiment of the present invention can be a 500kV line. The 500kv AC field in the embodiment of the present invention also adopts a 3 / 2 wiring method, including a first busbar 1M, a second busbar 2M, a first circuit breaker S1, a second circuit breaker S2 and a third circuit breaker S3. The first circuit breaker S1, the second circuit breaker S2 and the third circuit breaker S3 are all connected to the phase selection closing device 120.
[0045] Optionally, based on the above embodiment, continue to refer to Figure 1The reference voltage selection system also includes: a first bus voltage transformer PT1, a second bus voltage transformer PT2, a line voltage transformer PT3 and a plurality of disconnectors (S11, S12, S21, S22, S31, S32). The first bus voltage transformer PT1 is configured on the first bus 1M; the second bus voltage transformer PT2 is configured on the second bus 2M; the line voltage transformer PT3 is configured on the high-voltage line L. Disconnectors are connected in series at both ends of the first circuit breaker S1, the second circuit breaker S2 and the third circuit breaker S3.
[0046] Optionally, based on the above embodiment, continue to refer to Figure 1 The reference voltage selection system also includes: a line isolating switch S4; the line isolating switch S4 is connected in series to the high voltage line L, and the line isolating switch S4 is located between the line voltage transformer PT3, the second circuit breaker S2 and the third circuit breaker S3.
[0047] It can be understood that in the 500kV AC field in the embodiment of the present invention, each bus and line is equipped with a voltage transformer, and each line is equipped with an isolating switch. The phase selection and closing device 120 collects the position information of the isolating switch, and collects the voltage of the first bus 1M, the second bus 2M and the high-voltage line L, and can control the moving and static contacts of the first circuit breaker S1, the second circuit breaker S2 and the third circuit breaker S3 to open and close at the specified phase angle of the system voltage waveform.
[0048] Figure 2 A flowchart of a reference voltage selection method provided in an embodiment of the present invention. This embodiment is applicable to a reference voltage selection system. The method can be executed by a reference voltage selection device, and the reference voltage selection device can be implemented in the form of hardware and / or software.
[0049] refer to Figure 2 , the reference voltage selection methods include:
[0050] S210. Identify whether the high-voltage line is equipped with a line isolating switch.
[0051] It is understandable that, to identify whether a high-voltage line is configured with a line isolating switch, a suitable reference voltage may be selected according to whether the line isolating switch is configured.
[0052] S220: If it is identified that the high-voltage line is equipped with a line isolating switch, the state of the line isolating switch is identified.
[0053] The state of the line isolating switch can be an open state or a closed state.
[0054] S230: If it is identified that the line disconnector is in the disconnected state, the reference voltage is selected as the adjacent bus voltage, and the adjacent bus voltage is the voltage of the first bus or the voltage of the second bus.
[0055] Among them, the first bus voltage and the second bus voltage are between 525-540kV.
[0056] It can be understood that if it is identified that the line disconnector is in the disconnected state, the reference voltage is selected as the voltage of the busbar that is closest to the converter transformer in electrical distance.
[0057] In the embodiment of the present invention, by identifying whether a line disconnector is configured and the position of the line disconnector, the phase selection and closing device can automatically select the line voltage or the bus voltage as the reference voltage, thereby reducing the influence of the excitation inrush current on the converter transformer under different operating modes.
[0058] Figure 3 A flowchart of another method for selecting a reference voltage provided by an embodiment of the present invention, referring to Figure 3 , the method comprises the following steps:
[0059] S310. Identify whether the high-voltage line is equipped with a line isolating switch.
[0060] S320: If it is identified that the high-voltage line is equipped with a line isolating switch, the state of the line isolating switch is identified.
[0061] S330: If it is identified that the line disconnector is in the disconnected state, the reference voltage is selected as the adjacent bus voltage, and the adjacent bus voltage is the voltage of the first bus or the voltage of the second bus.
[0062] Optionally, based on the above embodiment, continue to refer to Figure 3 , after step S310, further comprising:
[0063] S321. If it is identified that the high-voltage line is not equipped with a line isolating switch, the reference voltage is selected as the line voltage, and the line voltage is the voltage of the high-voltage line.
[0064] Optionally, based on the above embodiment, continue to refer to Figure 3 , after step S320, further comprising:
[0065] S331. If it is identified that the line isolating switch is in a closed state, the reference voltage is selected as the line voltage.
[0066] In the embodiment of the present invention, by identifying whether a line disconnector is configured and the position of the line disconnector, the phase selection and closing device can automatically select the line voltage or the bus voltage as the reference voltage, thereby reducing the influence of the excitation inrush current on the converter transformer under different operating modes.
[0067] Figure 4 A schematic diagram of a reference voltage selection device provided by an embodiment of the present invention, referring to Figure 4 The device includes: a line isolating switch identification module 410, a line isolating switch state identification module 420 and a reference voltage selection module 430.
[0068] In the embodiment of the present invention, the line isolating switch identification module 410 is used to identify whether the high-voltage line is equipped with a line isolating switch. The line isolating switch state identification module 420 is used to identify the state of the line isolating switch if the line isolating switch identification module 410 identifies that the high-voltage line is equipped with a line isolating switch. The reference voltage selection module 430 is used to select the reference voltage as the adjacent bus voltage if the line isolating switch state identification module 420 identifies that the line isolating switch is in the disconnected state, and the adjacent bus voltage is the voltage of the first bus or the voltage of the second bus.
[0069] Optionally, based on the above embodiment, the reference voltage selection module 430 is also used to select the reference voltage as the line voltage if the line isolating switch identification module 420 identifies that the high-voltage line is not equipped with a line isolating switch, and the line voltage is the voltage of the high-voltage line.
[0070] Optionally, based on the above embodiment, the reference voltage selection module 430 is further configured to select the reference voltage as the line voltage if the line isolating switch state identification module 420 identifies that the line isolating switch is in a closed state.
[0071] The reference voltage selection device provided in the embodiment of the present invention can execute the reference voltage selection device method provided in any embodiment of the present invention, and has functional modules and beneficial effects corresponding to the execution method. For contents not described in detail in the embodiment of the present invention, reference can be made to the reference voltage selection provided in the above embodiment.
[0072] Figure 5 A schematic diagram of the structure of a reference voltage selection device provided by an embodiment of the present invention, Figure 5 A schematic diagram of a reference voltage selection device 10 that can be used to implement an embodiment of the present invention is shown. The reference voltage selection device is intended to represent various forms of digital computers, such as laptop computers, desktop computers, workbenches, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. The reference voltage selection device can also represent various forms of mobile devices, such as personal digital processing, cellular phones, smart phones, wearable devices (such as helmets, glasses, watches, etc.) and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely examples and are not intended to limit the implementation of the present invention described and / or required herein.
[0073] like Figure 5 As shown, the reference voltage selection device 10 includes at least one processor 11, and a memory connected to the at least one processor 11, such as a read-only memory (ROM) 12, a random access memory (RAM) 13, etc., wherein the memory stores a computer program that can be executed by at least one processor, and the processor 11 can perform various appropriate actions and processes according to the computer program stored in the read-only memory (ROM) 12 or the computer program loaded from the storage unit 18 to the random access memory (RAM) 13. In the RAM 13, various programs and data required for the operation of the reference voltage selection device 10 can also be stored. The processor 11, the ROM 12, and the RAM 13 are connected to each other through a bus 14. An input / output (I / O) interface 15 is also connected to the bus 14.
[0074] Multiple components in the reference voltage selection device 10 are connected to the I / O interface 15, including: an input unit 16, such as a keyboard, a mouse, etc.; an output unit 17, such as various types of displays, speakers, etc.; a storage unit 18, such as a disk, an optical disk, etc.; and a communication unit 19, such as a network card, a modem, a wireless communication transceiver, etc. The communication unit 19 allows the reference voltage selection device 10 to exchange information / data with other devices through a computer network such as the Internet and / or various telecommunication networks.
[0075] The processor 11 may be a variety of general and / or special processing components with processing and computing capabilities. Some examples of the processor 11 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various dedicated artificial intelligence (AI) computing chips, various processors running machine learning model algorithms, a digital signal processor (DSP), and any appropriate processor, controller, microcontroller, etc. The processor 11 performs the various methods and processes described above, such as a method for selecting a reference voltage.
[0076] In some embodiments, the method for selecting a reference voltage may be implemented as a computer program, which is tangibly contained in a computer-readable storage medium, such as a storage unit 18. In some embodiments, part or all of the computer program may be loaded and / or installed on the reference voltage selection device 10 via the ROM 12 and / or the communication unit 19. When the computer program is loaded into the RAM 13 and executed by the processor 11, one or more steps of the method for selecting a reference voltage described above may be performed. Alternatively, in other embodiments, the processor 11 may be configured to perform the method for selecting a reference voltage in any other appropriate manner (e.g., by means of firmware).
[0077] Various implementations of the systems and techniques described above herein can be implemented in digital electronic circuit systems, integrated circuit systems, field programmable gate arrays (FPGAs), application specific integrated circuits (ASICs), application specific standard products (ASSPs), systems on chips (SOCs), load programmable logic devices (CPLDs), computer hardware, firmware, software, and / or combinations thereof. These various implementations can include: being implemented in one or more computer programs that can be executed and / or interpreted on a programmable system including at least one programmable processor, which can be a special purpose or general purpose programmable processor that can receive data and instructions from a storage system, at least one input device, and at least one output device, and transmit data and instructions to the storage system, the at least one input device, and the at least one output device.
[0078] Computer programs for implementing the methods of the present invention may be written in any combination of one or more programming languages. These computer programs may be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device, so that when the computer program is executed by the processor, the functions / operations specified in the flow chart and / or block diagram are implemented. The computer program may be executed entirely on the machine, partially on the machine, partially on the machine and partially on a remote machine as a stand-alone software package, or entirely on a remote machine or server.
[0079] In the context of the present invention, a computer-readable storage medium may be a tangible medium that may contain or store a computer program for use by or in combination with an instruction execution system, device or equipment. A computer-readable storage medium may include, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, devices or equipment, or any suitable combination of the foregoing. Alternatively, a computer-readable storage medium may be a machine-readable signal medium. A more specific example of a machine-readable storage medium may include an electrical connection based on one or more lines, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.
[0080] To provide interaction with a user, the systems and techniques described herein may be implemented on a reference voltage selection device having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to a user; and a keyboard and a pointing device (e.g., a mouse or trackball), through which a user can provide input to the reference voltage selection device. Other types of devices may also be used to provide interaction with a user; for example, the feedback provided to the user may be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user may be received in any form (including acoustic input, voice input, or tactile input).
[0081] The systems and techniques described herein may be implemented in a computing system that includes backend components (e.g., as a data server), or a computing system that includes middleware components (e.g., an application server), or a computing system that includes frontend components (e.g., a user computer with a graphical user interface or a web browser through which a user can interact with implementations of the systems and techniques described herein), or a computing system that includes any combination of such backend components, middleware components, or frontend components. The components of the system may be interconnected by any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include: a local area network (LAN), a wide area network (WAN), a blockchain network, and the Internet.
[0082] A computing system may include a client and a server. The client and the server are generally remote from each other and usually interact through a communication network. The client and server relationship is generated by computer programs running on the corresponding computers and having a client-server relationship with each other. The server may be a cloud server, also known as a cloud computing server or cloud host, which is a host product in the cloud computing service system to solve the defects of difficult management and weak business scalability in traditional physical hosts and VPS services.
[0083] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.
[0084] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims
1. A method for selecting a reference voltage, characterized in that: A system for selecting a reference voltage, the system comprising: a first circuit breaker, a second circuit breaker, a third circuit breaker, a converter transformer and a phase selection closing device; The first circuit breaker is connected in series between the first busbar and the converter transformer, the second circuit breaker is connected in series between the converter transformer and the high-voltage line, and the third circuit breaker is connected in series between the high-voltage line and the second busbar; The phase selection and closing device is connected to the first circuit breaker, the second circuit breaker and the third circuit breaker; The method for selecting the reference voltage includes: Identifying whether the high-voltage line is equipped with a line isolating switch; If it is identified that the high-voltage line is equipped with a line isolating switch, identifying the state of the line isolating switch; If it is identified that the line disconnector is in an open state, the reference voltage is selected as an adjacent bus voltage, and the adjacent bus voltage is the voltage of the first bus or the voltage of the second bus.
2. The method for selecting a reference voltage according to claim 1, characterized in that: After identifying whether the high-voltage line is equipped with a line isolating switch, the method further includes: If it is identified that the high-voltage line is not equipped with a line isolating switch, the reference voltage is selected as the line voltage, and the line voltage is the voltage of the high-voltage line.
3. The method for selecting a reference voltage according to claim 1, wherein: If it is identified that the high-voltage line is equipped with a line isolating switch, after identifying the state of the line isolating switch, the method further includes: If it is identified that the line isolating switch is in a closed state, the reference voltage is selected as the line voltage.
4. A reference voltage selection device, characterized in that: include: A line isolating switch identification module is used to identify whether a high-voltage line is equipped with a line isolating switch; A line isolating switch state identification module, used for identifying the state of the line isolating switch if the line isolating switch identification module identifies that the high-voltage line is equipped with a line isolating switch; The reference voltage selection module is used to select the reference voltage as the adjacent bus voltage if the line disconnector state identification module identifies that the line disconnector is in the disconnected state, and the adjacent bus voltage is the voltage of the first bus or the voltage of the second bus.
5. The reference voltage selection device according to claim 4, characterized in that: The reference voltage selection module is further configured to select the reference voltage as the line voltage if the line isolating switch identification module identifies that the high-voltage line is not equipped with a line isolating switch, and the line voltage is the voltage of the high-voltage line.
6. The reference voltage selection device according to claim 4, characterized in that: The reference voltage selection module is further configured to select the reference voltage as the line voltage if the line isolating switch state identification module identifies that the line isolating switch is in a closed state.
7. A reference voltage selection device, characterized in that: The reference voltage selection device comprises: at least one processor; and a memory connected to the at least one processor in communication; wherein, The memory stores a computer program executable by the at least one processor, and the computer program is executed by the at least one processor so that the at least one processor can perform the reference voltage selection method according to any one of claims 1 to 3.
8. A reference voltage selection system, characterized in that: include: The reference voltage selection device, the first circuit breaker, the second circuit breaker, the third circuit breaker, the converter transformer and the phase selection closing device as described in claim 7; The first circuit breaker is connected in series between the first busbar and the converter transformer, the second circuit breaker is connected in series between the converter transformer and the high-voltage line, and the third circuit breaker is connected in series between the high-voltage line and the second busbar; The phase selection and closing device is connected to the first circuit breaker, the second circuit breaker and the third circuit breaker.
9. The reference voltage selection system according to claim 8, characterized in that: Also includes: A first bus voltage transformer, a second bus voltage transformer, a line voltage transformer and a plurality of disconnecting switches; The first bus voltage transformer is configured on the first bus; the second bus voltage transformer is configured on the second bus; the line voltage transformer is configured on the high-voltage line; The isolating switch is connected in series at both ends of the first circuit breaker, the second circuit breaker and the third circuit breaker.
10. The reference voltage selection system according to claim 9, characterized in that: Also includes: Line isolating switch; The line isolating switch is connected in series to the high-voltage line, and the line isolating switch is located between the line voltage transformer, the second circuit breaker and the third circuit breaker.