Method, device and system for judging and alarming that ac-dc system exceeds operation boundary

Abstract

The application relates to a judgment and alarm method, device and system for an AC-DC system exceeding an operation boundary, computer equipment and a storage medium. The AC-DC system comprises a DC transmission line and an AC transmission line. The method comprises the following steps: obtaining a DC operation mode and a DC operation power of the DC transmission line; obtaining an AC connection mode and a number of generator start-up units in the AC transmission line; determining an operation boundary condition of the DC transmission line according to the DC operation mode, the AC connection mode and the number of generator start-up units; wherein the operation boundary condition is used to represent the boundary of a DC power operation interval in the AC-DC system; and outputting an alarm signal when the DC operation power exceeds the operation boundary condition. The method can output an alarm signal when the DC transmission line exceeds the operation boundary, timely remind an operation and maintenance personnel that the AC-DC system has an operation risk, so that the operation and maintenance personnel can timely troubleshoot the risk and avoid complementary resonance of the AC-DC system.

Description

Technical Field

[0001] This application relates to the field of AC / DC hybrid power grid technology, and in particular to a method, device, system, computer equipment, and storage medium for judging and alarming when an AC / DC system exceeds its operating boundaries. Background Technology

[0002] With the development of new electronic power technologies such as renewable energy generation, the application of AC / DC hybrid transmission systems is becoming increasingly widespread. DC transmission systems have the advantages of large transmission capacity, long transmission distance, and low energy loss. Interconnecting two AC transmission systems via a DC system allows for the connection of two AC transmission systems operating asynchronously at different frequencies or the same frequency. However, when complementary resonance occurs in an AC / DC hybrid system, it can lead to harmonic instability, affecting normal operation.

[0003] Currently, harmonic instability in AC / DC hybrid systems is often suppressed by operating DC transmission lines within their operating limits. However, corresponding alarm methods and devices are still lacking. Summary of the Invention

[0004] Therefore, it is necessary to provide a method, device, system, computer equipment, and computer-readable storage medium for judging and alarming when an AC / DC system exceeds its operating boundary, which can provide an alarm when a DC transmission line exceeds its operating boundary.

[0005] In a first aspect, this application provides a method for determining and alarming when an AC / DC system exceeds its operating boundaries, wherein the AC / DC system includes DC transmission lines and AC transmission lines, and the method includes:

[0006] Obtain the DC operating mode and DC operating power of the DC transmission line;

[0007] Obtain the AC wiring method of the AC transmission line and the number of generators running in the AC transmission line;

[0008] The operating boundary conditions of the DC transmission line are determined based on the DC operating mode, the AC connection mode, and the number of generators in operation; wherein, the operating boundary conditions are used to represent the boundary of the DC power operating range in the AC / DC system;

[0009] An alarm signal is output when the DC operating power exceeds the operating boundary conditions.

[0010] In one embodiment, obtaining the DC operating mode of the DC transmission line includes:

[0011] The system acquires the unlock signal of the converter and the status signals of each DC switch in the DC transmission line; wherein the DC transmission line and the AC transmission line are connected through the converter.

[0012] The DC operating mode is determined based on the unlocking signal and the status signals of each DC switch; wherein the DC operating mode includes bipolar operation, monopolar operation, and monopolar metal operation.

[0013] In one embodiment, obtaining the AC wiring method of the AC transmission line and the number of generators running in the AC transmission line includes:

[0014] Acquire the start and end switch signals of each AC line in the AC transmission line and the start-up signals of each generator in the AC transmission line;

[0015] The AC wiring method is determined based on the start and end switch signals of each AC line;

[0016] The number of units to be powered on is determined based on each of the aforementioned power-on signals.

[0017] In one embodiment, the step of outputting an alarm signal when the DC operating power exceeds the operating boundary condition includes:

[0018] When the DC operating power exceeds the operating boundary conditions, the neutral point current of the converter is obtained;

[0019] If the neutral point current is lower than or equal to the current threshold, a first alarm signal is output.

[0020] If the neutral point current is higher than the current threshold, a second alarm signal is output.

[0021] In one embodiment, the step of outputting an alarm signal when the DC operating power exceeds the operating boundary condition further includes:

[0022] When the DC operating power exceeds the operating boundary conditions, the audible and visual alarm device is controlled to output the first alarm signal or the second alarm signal, wherein the first alarm signal and the second alarm signal are presented in different ways.

[0023] In one embodiment, determining the operating boundary conditions of the DC transmission line based on the DC operating mode, the AC wiring mode, and the number of generators in operation includes:

[0024] Construct a matching relationship mapping table; the matching relationship mapping table is used to represent the matching relationship between the DC operation mode, the AC wiring mode, the number of generators in operation, and the DC operation power.

[0025] The operating boundary of the DC transmission system is determined based on the DC operating mode, the AC wiring mode, the number of generators in operation, and the matching relationship mapping table.

[0026] Secondly, this application also provides an alarm device for determining when an AC / DC system exceeds its operating limits, the device comprising:

[0027] A DC data acquisition module is used to acquire the DC operating mode and DC operating power of the DC transmission line;

[0028] An AC data acquisition module is used to acquire the AC wiring method of the AC transmission line and the number of generators running in the AC transmission line;

[0029] The operation boundary acquisition module is used to determine the operation boundary conditions of the DC transmission line based on the DC operation mode, the AC connection mode, and the number of generators in operation; wherein, the operation boundary conditions are used to represent the boundary of the power operation range of the AC / DC system;

[0030] The alarm detection module is used to output an alarm signal when the DC operating power exceeds the operating boundary conditions.

[0031] Thirdly, this application also provides an alarm system for determining when an AC / DC system exceeds its operating limits, comprising:

[0032] An AC-side host is connected to an AC transmission line and is used to obtain the AC wiring method of the AC transmission line and the number of generators running in the AC transmission line.

[0033] A DC-side main unit is connected to a DC transmission line and is used to obtain the DC operating mode and DC operating power of the DC transmission line;

[0034] The main controller is connected to the AC-side host and the DC-side host respectively, and is used to determine the operating boundary conditions of the DC transmission line according to the DC operation mode, the AC wiring mode and the number of generators in operation, and to determine whether to trigger an alarm signal according to the DC operating power and the operating boundary conditions.

[0035] An audible and visual alarm device is connected to the main controller and is used to output the alarm signal.

[0036] Fourthly, this application also provides a computer device, including a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to implement the steps of the method for judging and alarming when the AC / DC system exceeds the operating boundary as described in any of the above embodiments.

[0037] Fifthly, this application also provides a computer-readable storage medium having a computer program stored thereon, wherein when the computer program is executed by a processor, it implements the steps of the method for determining and alarming when an AC / DC system exceeds its operating boundary as described in any of the above embodiments.

[0038] Sixthly, this application may also provide a computer program, including a computer program that, when executed by a processor, implements the steps of the method for determining and alarming when an AC / DC system exceeds its operating boundary as described in any of the above embodiments.

[0039] The aforementioned method, device, system, computer equipment, computer-readable storage medium, and computer program product for judging and alarming when AC / DC systems exceed operating boundaries acquire the DC operating mode and DC operating power of the DC transmission line, the AC connection mode of the AC transmission line, and the number of generators in operation. Based on these parameters, the operating boundary conditions of the DC transmission line are determined. Furthermore, when the DC operating power of the DC transmission line exceeds the operating boundary conditions, an alarm signal is output. This method can issue an alarm signal when the DC transmission line exceeds its operating boundaries, promptly alerting maintenance personnel to the operational risks in the AC / DC system. This allows maintenance personnel to promptly identify and address these risks, preventing complementary resonance in the AC / DC system. Attached Figure Description

[0040] Figure 1 This is a schematic diagram of a structural alarm system for determining when an AC / DC system exceeds its operating boundary, as shown in one embodiment.

[0041] Figure 2 This is a flowchart illustrating an alarm method for determining when an AC / DC system exceeds its operating boundaries in one embodiment.

[0042] Figure 3 This is an example of the operating boundary of a DC transmission line in one embodiment;

[0043] Figure 4 This is an example of a circuit diagram of a DC transmission line operating in a DC bipolar polarity mode, as shown in one embodiment.

[0044] Figure 5 This is a schematic diagram of the AC / DC system wiring in one embodiment;

[0045] Figure 6 This is a flowchart illustrating a method for determining and alarming when an AC / DC system exceeds its operating boundaries, as described in another embodiment.

[0046] Figure 7 This is a structural block diagram of an AC / DC system alarm device for determining if an AC / DC system exceeds its operating boundary, as shown in one embodiment.

[0047] Figure 8This is an internal structural diagram of a computer device in one embodiment. Detailed Implementation

[0048] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0049] AC / DC systems include DC transmission lines and AC transmission lines. Both ends of a DC transmission line can be connected to an AC transmission line via a converter. AC transmission lines include AC lines between hydropower stations, substations, and converter stations. When the harmonic impedances of the AC and DC transmission lines in an AC / DC system meet the resonance condition, AC / DC complementary resonance occurs, causing harmonic instability. To suppress AC / DC complementary resonance, the DC operating power of the DC transmission line can be limited, keeping it within its operating limits. However, in actual operation, the DC operating power may exceed these limits. Therefore, this application provides a method for judging and alarming when an AC / DC system exceeds its operating limits, which can be applied to applications such as... Figure 1 The AC / DC system shown is used to determine and alarm when it exceeds the operating boundary.

[0050] The AC / DC system exceeding its operating boundaries alarm system 100 includes a main controller 102, an AC-side host 104, a DC-side host 106, and an audible and visual alarm device 108. The main controller 102 establishes communication connections with the AC-side host 104, the DC-side host 106, and the audible and visual alarm device 108. The AC-side host 104 is connected to the AC transmission line 110 and can acquire AC operating information of the AC transmission line 110, including AC wiring methods and the number of generators in operation, and send this information to the main controller 102. The DC-side host 106 is connected to the DC transmission line 112 and can acquire DC operating information of the DC transmission line 112, including DC operating mode and DC operating power, and send this information to the main controller 102. The main controller 102 can be a computer device that stores specific data on the AC / DC system's operating boundary conditions. The main controller 102 can determine whether the DC transmission line 112 exceeds the operating boundary conditions based on the operating information of each transmission line. If the DC transmission line 102 exceeds the operating boundary conditions, the main controller 102 can control the audible and visual alarm device 108 to output an alarm signal to remind the maintenance personnel that there is an operational risk in the AC / DC system.

[0051] In one embodiment, such as Figure 2 As shown, this application provides a method for judging and alarming when an AC / DC system exceeds its operating boundary, including steps 202-208.

[0052] Step 202: Obtain the DC operating mode and DC operating power of the DC transmission line.

[0053] The DC operation modes of AC / DC systems include bipolar operation, unipolar grounded operation, and unipolar metallic operation. The DC operation mode, DC transmission voltage, and DC transmission current of the DC transmission line can be obtained through the substation management backend, and the DC operating power can be calculated based on the DC transmission voltage and current.

[0054] Step 204: Obtain the AC wiring method of the AC transmission line and the number of generators started in the AC transmission line.

[0055] AC transmission lines have various AC connection methods. Different connection methods result in different numbers of filters used in the AC transmission line, altering its harmonic impedance and thus disrupting the complementary resonance condition of the AC / DC system. Therefore, it is necessary to obtain the AC connection method of the AC transmission line. Furthermore, since changing the number of generators alters the harmonic impedance of the AC transmission line, which in turn changes the equivalent impedance on the AC side, disrupting the complementary resonance condition of the AC / DC system, it is also necessary to obtain the number of generators operating in the AC transmission line.

[0056] Step 206: Determine the operating boundary conditions of the DC transmission line based on the DC operation mode, AC connection mode, and number of generators in operation.

[0057] The operating boundary conditions are used to represent the boundaries of the DC power operating range of the AC / DC system. For example, when the AC connection is fully connected and the DC operation mode is bipolar, the relationship between the number of generators in operation and the DC operating power is as follows: Figure 3 As shown, the horizontal axis represents the number of generators in operation, in units (G), and the vertical axis represents the DC operating power, in megawatts (MW). The gray area represents the DC power operating range of the DC transmission line under different numbers of generators in operation.

[0058] The alarm system stores the operating boundary conditions of DC transmission lines under different DC operating modes, different AC wiring methods, and different numbers of generators in operation. Based on the currently acquired DC operating mode, AC wiring method, and number of generators in operation, the alarm system can look up the corresponding operating boundary conditions of the DC transmission line under the current state in a table.

[0059] Step 208: If the DC operating power exceeds the operating boundary conditions, an alarm signal is output.

[0060] The alarm system determines whether the DC operating power of the DC transmission line exceeds the operating boundary conditions by judging whether the DC operating power is within the DC power operating range indicated by the operating boundary conditions. If the DC operating power exceeds the operating boundary conditions, an alarm signal is output to alert maintenance personnel that there is an operational risk in the AC / DC system.

[0061] In this embodiment, the DC operating mode and DC operating power of the DC transmission line, the AC connection mode and the number of generators in operation of the AC transmission line are obtained, and the operating boundary conditions of the DC transmission line are determined based on the DC operating mode, AC connection mode and the number of generators in operation. Furthermore, when the DC operating power of the DC transmission line exceeds the operating boundary conditions, an alarm signal is output in a timely manner to remind the operation and maintenance personnel that there is an operational risk in the AC / DC system, so that the operation and maintenance personnel can promptly investigate the risk and avoid complementary resonance in the AC / DC system.

[0062] In one embodiment, obtaining the DC operating mode of a DC transmission line includes obtaining the unlocking signal of the converter and the status signals of each DC switch in the DC transmission line, and determining the DC operating mode based on the unlocking signal and the status signals of each DC switch.

[0063] Among them, DC operation modes include bipolar operation, monopolar operation, and monopolar metal operation.

[0064] The alarm system can obtain the unlocking signal of the converter and the status signals of each DC switch by interacting with the substation management backend. The converter includes a rectifier and an inverter; the rectifier converts AC to DC, and the inverter converts DC to AC. The unlocking signal indicates whether the converter is in use within the current AC / DC system. DC switches in DC transmission lines include DC circuit breakers and isolating switches.

[0065] For example, Figure 4 This is a DC transmission line operating in bipolar DC mode, where the arrows indicate the direction of DC current flow, and VSC represents the converter. The status signals of the DC switches on the transmission line can be changed, for example, by altering the status signals of the DC circuit breakers and isolating switches. Figure 4 The switching status (not shown in the diagram) changes the DC operating mode from bipolar to monopolar. Furthermore, the number of converters in operation varies depending on the DC operating mode. Therefore, the DC operating mode can be determined by acquiring the converter unlocking signal and the status signals of each DC switch in the return transmission line.

[0066] In this embodiment of the application, by acquiring the unlocking signal of the converter and the status signals of each DC switch in the DC transmission line, the judgment alarm system can accurately determine the DC operation mode based on the unlocking signal and the status signals of each DC switch.

[0067] In one embodiment, obtaining the AC wiring method of the AC transmission line and the number of generators started in the AC transmission line includes the steps of obtaining the start and end switch signals of each AC line and the start signal of each generator in the AC transmission line, determining the AC wiring method based on the start and end switch signals of each AC line, and determining the number of generators started based on each start signal.

[0068] The alarm system can acquire the start and end switch signals of each AC transmission line and determine the AC wiring method based on these signals. Specifically, if either the start or end switch signal of an AC line is open, the AC line is determined to be disconnected. If both the start and end switch signals of an AC line are closed, the AC line is determined to be connected. For example, such as... Figure 5 As shown, three lines, A, B, and C, are installed between the hydropower station and the rectifier station. In an AC / DC system, it is only necessary to ensure that there is at least one line connection between the hydropower station and the rectifier station. It can be understood that different line connections between the hydropower station and the rectifier station can represent different AC wiring methods.

[0069] The alarm system can also acquire the start-up signals of generators in AC transmission lines to determine the number of generators in operation. For example, the alarm system can acquire the start-up signals of each generator in a hydropower station through the station's management system.

[0070] In one embodiment, determining the operating boundary conditions of a DC transmission line based on the DC operating mode, AC connection mode, and number of generators in operation includes the steps of constructing a matching relationship mapping table and determining the operating boundary of the DC transmission system based on the DC operating mode, AC connection mode, number of generators in operation, and the matching relationship mapping table.

[0071] The matching relationship mapping table represents the matching relationships between DC operating mode, AC wiring mode, number of generators in operation, and DC operating power. The operating boundaries of the DC transmission line are calculated in advance under different DC operating modes, different AC wiring modes, and different numbers of generators in operation, and the matching relationship mapping table is constructed and stored in the memory of the judgment and alarm system. Furthermore, after determining the current DC operating mode, AC wiring mode, and number of generators in operation of the AC / DC system, the operating boundaries of the DC transmission line under the current operating state can be determined by querying the matching relationship mapping table.

[0072] In one embodiment, such as Figure 6 As shown, this application provides a method for judging and alarming when an AC / DC system exceeds its operating boundary, including steps 602-612.

[0073] Step 602: Obtain the DC operating mode and DC operating power of the DC transmission line.

[0074] Step 604: Obtain the AC wiring method of the AC transmission line and the number of generators started in the AC transmission line.

[0075] Step 606: Determine the operating boundary conditions of the DC transmission line based on the DC operating mode, AC connection mode, and number of generators in operation.

[0076] Steps 602-606 correspond one-to-one with steps 202-206, and will not be repeated here.

[0077] Step 608: When the DC operating power exceeds the operating boundary conditions, obtain the neutral point current of the converter.

[0078] If DC current flows into the neutral point of the converter, it will cause converter saturation, resulting in excitation current distortion and complementary resonance. DC operating power exceeding the operating boundary conditions will increase the probability of complementary resonance in the AC / DC system. To more accurately determine whether complementary resonance has occurred in the AC / DC system, it is also necessary to obtain the neutral point current of the converter.

[0079] Step 610: If the neutral point current is lower than or equal to the current threshold, output the first alarm signal.

[0080] Step 612: If the neutral point current is higher than the current threshold, output a second alarm signal.

[0081] If the neutral point current of the converter is lower than or equal to the current threshold, the converter is not saturated and outputs a first alarm signal, alerting maintenance personnel that there is an operational risk in the AC / DC system, but it can still continue to operate, and risk prevention is necessary. If the neutral point current of the converter is higher than the current threshold, the converter is saturated and outputs a second alarm signal, alerting maintenance personnel that there is an operational risk in the AC / DC system, and fault investigation is required immediately. For example, the current threshold can be set to 40A.

[0082] Furthermore, when the DC operating power exceeds the operating boundary conditions, the audible and visual alarm device can be controlled to output a first alarm signal or a second alarm signal.

[0083] The first and second alarm signals are presented differently. The audible and visual alarm device may include a buzzer, indicator light, etc. When the DC operating power exceeds the operating boundary conditions, the alarm system can control the audible and visual alarm device to output either a first or second alarm signal based on the comparison between the converter neutral point current and the current threshold. Specifically, when the neutral point current is lower than or equal to the current threshold, the alarm system controls the audible and visual alarm device to output the first alarm signal, for example, by controlling the indicator light of the audible and visual alarm device to turn yellow, or by controlling the buzzer to emit a short buzzing sound. When the neutral point current is higher than the current threshold, the alarm system controls the audible and visual alarm device to output the second alarm signal, for example, by controlling the indicator light of the audible and visual alarm device to turn red, or by controlling the buzzer to emit a long buzzing sound.

[0084] In this embodiment, by acquiring the DC operating mode and DC operating power of the DC transmission line, the AC connection mode and the number of generators in operation of the AC transmission line, the operating boundary conditions of the DC transmission line can be accurately determined based on the DC operating mode, AC connection mode and the number of generators in operation. Furthermore, when the DC operating power of the DC transmission line exceeds the operating boundary conditions, the neutral point current of the converter is acquired, and the audible and visual alarm device is controlled to output a first alarm signal or a second alarm signal based on the comparison result between the neutral point current and the current threshold. This can more accurately remind maintenance personnel of the operational risks of the AC / DC system, enabling maintenance personnel to promptly investigate risks and avoid complementary resonance in the AC / DC system.

[0085] It should be understood that although the steps in the flowcharts of the above embodiments are shown in a certain order, these steps are not necessarily executed in that order. Unless otherwise expressly stated herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some steps in the flowcharts of the above embodiments may include multiple steps or multiple stages. These steps or stages are not necessarily completed at the same time, but can be executed at different times. The execution order of these steps or stages is not necessarily sequential, but can be performed alternately or in turn with other steps or at least some of the steps or stages in other steps.

[0086] Based on the same inventive concept, this application also provides an AC / DC system exceeding operating boundary judgment and alarm device for implementing the above-described AC / DC system exceeding operating boundary judgment and alarm method. The solution provided by this device is similar to the solution described in the above method. Therefore, the specific limitations of one or more AC / DC system exceeding operating boundary judgment and alarm device embodiments provided below can be found in the limitations of the AC / DC system exceeding operating boundary judgment and alarm method described above, and will not be repeated here.

[0087] In one embodiment, such as Figure 7 As shown, an alarm device for judging and detecting when an AC / DC system exceeds its operating boundary is provided, comprising: a DC data acquisition module 702, an AC data acquisition module 704, an operating boundary acquisition module 706, and a judgment and alarm module 708, wherein:

[0088] The DC data acquisition module 702 is used to acquire the DC operating mode and DC operating power of the DC transmission line;

[0089] The AC data acquisition module 704 is used to acquire the AC wiring method of the AC transmission line and the number of generators in operation in the AC transmission line;

[0090] The operating boundary acquisition module 706 is used to determine the operating boundary conditions of the DC transmission system based on the DC operating mode, AC connection mode, and number of generators in operation; wherein, the operating boundary conditions are used to represent the boundaries of the power operating range of the AC / DC system;

[0091] The alarm detection module 708 is used to output an alarm signal when the DC operating power exceeds the operating boundary conditions.

[0092] In one embodiment, the DC data acquisition module is further configured to acquire the unlocking signal of the converter and the status signals of each DC switch in the DC transmission line; wherein the DC transmission line and the AC transmission line are connected through the converter;

[0093] The DC operating mode is determined based on the unlocking signal and the status signals of each DC switch; among them, the DC operating modes include bipolar operation, monopolar operation, and monopolar metal operation.

[0094] In one embodiment, the AC data acquisition module is also used to acquire the start and end switch signals of each AC line in the AC transmission line and the start-up signals of each generator in the AC transmission line.

[0095] The AC wiring method is determined based on the switch signals at the beginning and end of each AC line;

[0096] The number of units to be powered on is determined based on each power-on signal.

[0097] In one embodiment, the alarm module is further configured to obtain the neutral point current of the converter when the DC operating power exceeds the operating boundary conditions.

[0098] If the neutral point current is lower than or equal to the current threshold, output the first alarm signal;

[0099] If the neutral point current is higher than the current threshold, a second alarm signal is output.

[0100] In one embodiment, the alarm module is further configured to control the audible and visual alarm device to output a first alarm signal or a second alarm signal when the DC operating power exceeds the operating boundary conditions, wherein the first alarm signal and the second alarm signal are presented in different ways.

[0101] In one embodiment, the operation boundary acquisition module is also used to construct a matching relationship mapping table; the matching relationship mapping table is used to represent the matching relationship between DC operation mode, AC wiring mode, number of generators in operation, and DC operation power.

[0102] The operating boundary of the DC transmission system is determined based on the DC operation mode, AC connection mode, number of generators in operation, and matching relationship mapping table.

[0103] The modules in the aforementioned alarm device for determining when an AC / DC system exceeds its operating limits can be implemented entirely or partially through software, hardware, or a combination thereof. These modules can be embedded in the processor of a computer device in hardware form or independent of it, or stored in the memory of a computer device in software form, so that the processor can call and execute the corresponding operations of each module.

[0104] In one embodiment, a computer device is provided, which may be a server, and its internal structure diagram may be as follows: Figure 8 As shown, this computer device includes a processor, memory, input / output (I / O) interfaces, and a communication interface. The processor, memory, and I / O interfaces are connected via a system bus, and the communication interface is also connected to the system bus via the I / O interfaces. The processor provides computational and control capabilities. The memory includes non-volatile storage media and internal memory. The non-volatile storage media stores the operating system, computer programs, and a database. The internal memory provides the environment for the operation of the operating system and computer programs stored in the non-volatile storage media. The database stores operational boundary conditions. The I / O interfaces are used for information exchange between the processor and external devices. The communication interface is used for communication with external terminals via a network connection. When executed by the processor, the computer program implements an alarm method for determining when an AC / DC system exceeds its operational boundaries.

[0105] Those skilled in the art will understand that Figure 8 The structure shown is merely a block diagram of a portion of the structure related to the present application and does not constitute a limitation on the computer device to which the present application is applied. Specific computer devices may include more or fewer components than those shown in the figure, or combine certain components, or have different component arrangements.

[0106] In one embodiment, a computer device is provided, including a memory and a processor. The memory stores a computer program, and the processor executes the computer program to implement the alarm method for determining that an AC / DC system exceeds its operating boundary as provided in any of the above embodiments.

[0107] In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored, which, when executed by a processor, implements the method for determining and alarming when an AC / DC system exceeds its operating boundary as provided in any of the above embodiments.

[0108] In one embodiment, a computer program product is provided, including a computer program that, when executed by a processor, implements the method for determining and alarming when an AC / DC system exceeds its operating boundary as provided in any of the above embodiments.

[0109] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium. When executed, the computer program can include the processes of the embodiments of the above methods. Any references to memory, databases, or other media used in the embodiments provided in this application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM). The databases involved in the embodiments provided in this application may include at least one type of relational database and non-relational database. Non-relational databases may include, but are not limited to, blockchain-based distributed databases. The processors involved in the embodiments provided in this application may be general-purpose processors, central processing units, graphics processing units, digital signal processors, programmable logic devices, quantum computing-based data processing logic devices, etc., and are not limited to these.

[0110] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0111] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. A method for determining and alarming when an AC / DC system exceeds its operating boundaries, characterized in that, The AC / DC system includes DC transmission lines and AC transmission lines, and the method includes: Obtain the DC operating mode and DC operating power of the DC transmission line; The AC wiring method of the AC transmission line and the number of generators started in the AC transmission line are obtained; wherein, obtaining the AC wiring method of the AC transmission line includes: obtaining the start and end switch signals of each AC line in the AC transmission line, and determining whether each AC line is connected based on the start and end switch signals of each AC line, so as to determine the AC wiring method. The operating boundary conditions of the DC transmission line are determined based on the DC operating mode, the AC connection mode, and the number of generators in operation; wherein, the operating boundary conditions are used to represent the boundary of the DC power operating range in the AC / DC system; An alarm signal is output when the DC operating power exceeds the operating boundary conditions.

2. The method according to claim 1, characterized in that, The process of obtaining the DC operating mode of the DC transmission line includes: The system acquires the unlock signal of the converter and the status signals of each DC switch in the DC transmission line; wherein the DC transmission line and the AC transmission line are connected through the converter. The DC operating mode is determined based on the unlocking signal and the status signals of each DC switch; wherein the DC operating mode includes bipolar operation, monopolar operation, and monopolar metal operation.

3. The method according to claim 1, characterized in that, The step of obtaining the number of generators in operation in the AC transmission line includes: Obtain the start-up signals of each generator in the AC transmission line; The number of units to be powered on is determined based on each of the aforementioned power-on signals.

4. The method according to claim 2, characterized in that, When the DC operating power exceeds the operating boundary condition, an alarm signal is output, including: When the DC operating power exceeds the operating boundary conditions, the neutral point current of the converter is obtained; If the neutral point current is lower than or equal to the current threshold, a first alarm signal is output. If the neutral point current is higher than the current threshold, a second alarm signal is output.

5. The method according to claim 4, characterized in that, The method of outputting an alarm signal when the DC operating power exceeds the operating boundary condition also includes: When the DC operating power exceeds the operating boundary conditions, the audible and visual alarm device is controlled to output the first alarm signal or the second alarm signal, wherein the first alarm signal and the second alarm signal are presented in different ways.

6. The method according to claim 1, characterized in that, The determination of the operating boundary conditions of the DC transmission line based on the DC operating mode, the AC connection mode, and the number of generators in operation includes: Construct a matching relationship mapping table; the matching relationship mapping table is used to represent the matching relationship between the DC operation mode, the AC wiring mode, the number of generators in operation, and the DC operation power. The operating boundary of the DC transmission line is determined based on the DC operating mode, the AC wiring mode, the number of generators in operation, and the matching relationship mapping table.

7. A detection and alarm device for AC / DC systems exceeding operating boundaries, characterized in that, The device includes: A DC data acquisition module is used to acquire the DC operating mode and DC operating power of the DC transmission line; An AC data acquisition module is used to acquire the AC wiring method of the AC transmission line and the number of generators started in the AC transmission line; wherein, acquiring the AC wiring method of the AC transmission line includes: acquiring the start and end switch signals of each AC line in the AC transmission line, and determining whether each AC line is connected based on the start and end switch signals of each AC line, so as to determine the AC wiring method. The operation boundary acquisition module is used to determine the operation boundary conditions of the DC transmission line based on the DC operation mode, the AC connection mode, and the number of generators in operation; wherein, the operation boundary conditions are used to represent the boundary of the power operation range of the AC / DC system; The alarm detection module is used to output an alarm signal when the DC operating power exceeds the operating boundary conditions.

8. A judgment and alarm system for AC / DC systems exceeding operating boundaries, characterized in that, include: An AC-side host is connected to an AC transmission line and is used to obtain the AC wiring method of the AC transmission line and the number of generators started in the AC transmission line; wherein, obtaining the AC wiring method of the AC transmission line includes: obtaining the start and end switch signals of each AC line in the AC transmission line, and determining whether each AC line is connected based on the start and end switch signals of each AC line, so as to determine the AC wiring method; A DC-side main unit is connected to a DC transmission line and is used to obtain the DC operating mode and DC operating power of the DC transmission line; The main controller is connected to the AC-side host and the DC-side host respectively, and is used to determine the operating boundary conditions of the DC transmission line according to the DC operation mode, the AC wiring mode and the number of generators in operation, and to determine whether to trigger an alarm signal according to the DC operating power and the operating boundary conditions. An audible and visual alarm device is connected to the main controller and is used to output the alarm signal.

9. A computer device comprising a memory and a processor, wherein the memory stores a computer program, characterized in that, When the processor executes the computer program, it implements the steps of the method according to any one of claims 1 to 6.

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

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