A fault-passing method and system for power transmission systems

Abstract

This invention provides a fault-passing method and system for an AC-AC frequency converter. The method includes: detecting the operating status of the main power modules on each bridge arm; obtaining the number of faulty main power modules on each bridge arm based on the operating status of the main power modules on each bridge arm; and executing a corresponding bypass mechanism based on the number of faulty main power modules and the number of redundant power modules on each bridge arm. The bypass mechanism includes a power module-level bypass mechanism, a frequency converter module-level bypass mechanism, and a system-level bypass mechanism. This enables three fault-passing modes for the AC-AC frequency converter: six-phase operation, nine-phase operation, or power frequency operation, when the number of main power modules is greater than, less than, or equal to the number of redundant power modules.

Description

Technical Field

[0001] This invention relates to the field of power transmission technology, and more specifically to a fault-crossing method and system for power transmission systems. Background Technology

[0002] Energy is a crucial material foundation for economic and social development. Accelerating the establishment of a safe, reliable, economical, efficient, clean, and environmentally friendly modern energy supply system has become a common strategic goal for countries worldwide. To effectively address energy depletion and environmental pollution, developing new energy sources has become the only way to meet the three major challenges of energy security, environmental pollution, and climate change, and to achieve sustainable development for human society. Wind power generation is one of the most mature and scalable new energy power generation technologies. In some regions, wind power resources and load centers are distributed inversely, requiring large-capacity, long-distance power transmission to optimize resource allocation.

[0003] To enable low-frequency power transmission, existing power transmission systems typically install frequency converters on the power frequency side of the AC grid. These frequency converters obtain power from the AC grid on the power frequency side. However, if the frequency converter malfunctions, low-frequency power transmission will be impossible. Summary of the Invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defect in the prior art that the failure of the frequency converter will lead to the inability to realize low frequency power transmission, thereby providing a fault crossing method and system for power transmission systems.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] In a first aspect, embodiments of the present invention provide a fault-crossing method for a power transmission system, characterized in that the power transmission system includes: an AC-AC frequency converter, the AC-AC frequency converter being composed of multiple frequency conversion modules, each frequency conversion module being composed of multiple bridge arms, each bridge arm being connected to a single-phase AC transmission bus, each bridge arm being composed of multiple power modules connected in series, the power modules including main power modules and redundant power modules, the fault-crossing method including: detecting the operating status of the main power modules on each bridge arm, obtaining the number of faulty main power modules on each bridge arm based on the operating status of the main power modules on each bridge arm; and executing a corresponding bypass mechanism based on the number of faulty main power modules and the number of redundant power modules on each bridge arm, the bypass mechanism including: a power module-level bypass mechanism, a frequency conversion module-level bypass mechanism, and a system-level bypass mechanism.

[0007] In one embodiment, the process of determining the fault type of the AC-AC inverter based on the number of faulty main power modules and the number of redundant power modules on each bridge arm includes: for each bridge arm, when the number of faulty main power modules on the bridge arm is not greater than the number of redundant power modules, the bridge arm is determined to be operating normally.

[0008] In one embodiment, the process of determining the fault type of the AC-AC inverter based on the number of faulty main power modules and the number of redundant power modules on each bridge arm further includes: for each bridge arm, when the number of faulty main power modules on the bridge arm is greater than the number of redundant power modules, the bridge arm is determined to be faulty.

[0009] In one embodiment, the process of determining the fault type of the AC-AC inverter based on the number of faulty main power modules and the number of redundant power modules on each bridge arm further includes: for each inverter module, when at least one bridge arm fails, the inverter module is determined to be faulty.

[0010] In one embodiment, the process of determining the fault type of the AC-AC inverter based on the number of faulty main power modules and the number of redundant power modules on each bridge arm further includes: for the AC-AC inverter, when only one inverter module fails, the power transmission system is determined to be a inverter module-level fault; when at least two inverter modules fail, the power transmission system is determined to be a converter fault.

[0011] In one embodiment, the power module-level bypass mechanism is as follows: when the number of faulty main power modules on the bridge arm is not greater than the number of redundant power modules, the faulty main power modules are bypassed; based on the number of faulty main power modules, the same number of redundant power modules are switched from hot standby state to normal operation state.

[0012] In one embodiment, the frequency converter module-level bypass mechanism includes bypassing the faulty frequency converter module when a frequency converter module-level fault occurs in the power transmission system.

[0013] In one embodiment, the system-level bypass mechanism includes: when a converter failure occurs in the power transmission system, all frequency converter modules are bypassed, and the power transmission system switches to power frequency operation.

[0014] Secondly, embodiments of the present invention provide a fault-crossing system for a power transmission system, comprising: a detection module for detecting the operating status of the main power modules on each bridge arm and obtaining the number of faulty main power modules on each bridge arm based on the operating status of the main power modules on each bridge arm; and a bypass module for executing a corresponding bypass mechanism based on the number of faulty main power modules and the number of redundant power modules on each bridge arm, the bypass mechanism including: a power module-level bypass mechanism, a frequency converter module-level bypass mechanism, and a system-level bypass mechanism.

[0015] Thirdly, embodiments of the present invention provide a computer device, including: at least one processor, and a memory communicatively connected to the at least one processor, wherein the memory stores instructions executable by the at least one processor, the instructions being executed by the at least one processor to cause the at least one processor to perform the fault crossing method of the power transmission system according to the first aspect of the present invention.

[0016] Fourthly, embodiments of the present invention provide a computer-readable storage medium storing computer instructions for causing a computer to execute the fault-crossing method for a power transmission system according to the first aspect of the present invention.

[0017] The technical solution of this invention has the following advantages:

[0018] 1. The fault-passing method and system for AC-AC frequency converters provided by this invention detects the operating status of the main power modules on each bridge arm, and obtains the number of faulty main power modules on each bridge arm based on the operating status of the main power modules on each bridge arm; based on the number of faulty main power modules and the number of redundant power modules on each bridge arm, a corresponding bypass mechanism is executed. The bypass mechanism includes: power module-level bypass mechanism, frequency converter module-level bypass mechanism, and system-level bypass mechanism, thereby realizing three fault-passing modes for AC-AC frequency converters: six-phase operation, nine-phase operation, or power frequency operation, when the number of main power modules is greater than, less than, or equal to the number of redundant power modules.

[0019] 2. The fault-crossing method for AC-AC frequency converters provided by this invention, for each bridge arm, when the number of faulty main power modules on the bridge arm is not greater than the number of redundant power modules, bypasses the faulty main power modules, and switches the same number of redundant power modules from hot standby state to normal operating state, and the AC-AC frequency converter operates in nine phases; when the number of faulty main power modules on the bridge arm is greater than the number of redundant power modules, the bridge arm is determined to be faulty; for each frequency converter module, when at least one bridge arm is faulty, the frequency converter module is determined to be faulty; for the AC-AC frequency converter, when only one frequency converter module is faulty, the power transmission system is determined to be a frequency converter module-level fault, the faulty frequency converter module is bypassed, and the AC-AC frequency converter operates in six phases; when at least two frequency converter modules are faulty, the power transmission system is determined to be a converter fault, all frequency converter modules are bypassed, and the power transmission system switches to power frequency operation. Attached Figure Description

[0020] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0021] Figure 1 A composition diagram of a specific example of a power transmission system provided in an embodiment of the present invention;

[0022] Figure 2 A composition diagram of a specific example of a frequency converter module provided in an embodiment of the present invention;

[0023] Figure 3 A composition diagram of a specific example of a power module provided in an embodiment of the present invention;

[0024] Figure 4 A flowchart illustrating a specific example of the fault-crossing method provided in an embodiment of the present invention;

[0025] Figure 5 A composition diagram of a specific example of a fault crossing system provided in an embodiment of the present invention;

[0026] Figure 6 This is a composition diagram of a specific example of a computer device provided in an embodiment of the present invention. Detailed Implementation

[0027] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can also refer to the internal connection of two components; and they can refer to a wireless connection or a wired connection. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0029] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0030] Example 1

[0031] This invention provides a fault transit method for power transmission systems, applicable to situations involving fault transit of AC-AC converters, such as... Figure 1 As shown, the power transmission system includes: an AC-AC converter 1 composed of multiple frequency conversion modules 11. The input terminal of each frequency conversion module is connected to the three-phase AC transmission bus output by AC system #1, and the output terminal of each frequency conversion module is connected to any one phase AC transmission bus of AC system #2. The AC-AC converter realizes frequency conversion power transmission between AC system #1 and AC system #2, so that AC system #1 operates at power frequency and AC system #2 operates at low frequency.

[0032] The specific structure of each frequency converter module in this embodiment of the invention is as follows: Figure 2 As shown, each frequency converter module consists of multiple bridge arms 111, each bridge arm is connected to a phase AC transmission bus, and each bridge arm consists of multiple power modules 1111 connected in series. The power modules include a main power module and a redundant power module. When the main power module is not faulty, the redundant power module is in a hot standby state.

[0033] It should be noted that, Figure 2 To simplify the structure of the frequency converter module, other modified structures can be obtained according to actual needs, which will not be elaborated here.

[0034] The main power module and the redundant power module in this embodiment of the invention have the same circuit structure and function, and their specific circuit structures can be as follows: Figure 3 As shown, Figure 3 The power module in the example uses a full-bridge circuit based on an IGBT with anti-parallel diodes, but this is only an example and not a limitation. Furthermore, [the following text appears to be incomplete and requires further context: "by..."] Figure 2 and Figure 3 It can be seen that the AC-AC inverter in this embodiment of the invention is a nine-phase AC-AC inverter, which includes three inverter modules, and each inverter module includes three bridge arms.

[0035] like Figure 4 As shown, the fault crossing method of this invention includes:

[0036] Step S1: Detect the operating status of the main power module on each bridge arm, and obtain the number of faulty main power modules on each bridge arm based on the operating status of the main power module on each bridge arm.

[0037] Step S2: Based on the number of faulty main power modules and the number of redundant power modules on each bridge arm, execute the corresponding bypass mechanism. The bypass mechanisms include: power module-level bypass mechanism, frequency converter module-level bypass mechanism, and system-level bypass mechanism.

[0038] Specifically, in this embodiment of the invention, for each bridge arm, the main power module and the redundant power module are connected in series. When the main power module on the bridge arm is not faulty, the redundant power module is in a hot standby state, that is, the redundant power module is in a bypass state. The number of main power modules and the number of redundant power modules can be set according to actual conditions. Therefore, the number of faulty main power modules can be greater than, less than, or equal to the number of redundant power modules. These three situations will result in different operating states. For example, when the number of faulty main power modules is less than or equal to the number of redundant modules, the same number of redundant power modules can be switched from hot standby to hot standby. The system switches from a normal operating state to a normal operating state, bypassing the faulty main power module so that a redundant power module can take over its work. However, when the number of faulty main power modules is greater than the number of redundant modules, some faulty main power modules do not have a redundant power module to replace them, so the entire bridge arm fails. In addition, when at least one bridge arm in a frequency converter fails, the entire frequency converter fails and can no longer perform frequency conversion, i.e., the frequency converter fails. When at least two frequency converter modules fail, the AC-AC frequency converter fails and can no longer perform frequency conversion, so as to realize frequency conversion power transmission between AC system #1 and AC system #2.

[0039] Therefore, as can be seen from the above, based on the number of faulty main power modules and the number of redundant power modules on each bridge arm, three fault transit methods can be obtained, of which the power module level bypass mechanism is the first-level fault transit method, the frequency converter module level bypass mechanism is the second-level fault transit method, and the system level bypass mechanism is the third-level fault transit method.

[0040] It should be noted that the methods for determining the fault of the main power module based on its operating status are not limited to the following: detecting the voltage, current, electrical parameters of components, and trigger pulses of the main power module.

[0041] In one specific embodiment, the process by which the AC-AC inverter determines the fault type based on the number of faulty main power modules and the number of redundant power modules on each bridge arm is as follows:

[0042] (1) For each bridge arm, if the number of faulty main power modules on the bridge arm is not greater than the number of redundant power modules, the bridge arm is considered to be operating normally.

[0043] Specifically, each bridge arm in this embodiment of the invention is composed of multiple main power modules and redundant power modules connected in series. When the number of faulty main power modules on the bridge arm is less than or equal to the number of redundant power modules, since all faulty main power modules have redundant power modules to replace them, the first-level fault transit method is adopted to start the power module-level bypass mechanism.

[0044] The power module-level bypass mechanism of this invention includes: when only a bridge arm fault occurs in the power transmission system, the main power module that is faulty is bypassed; according to the number of faulty main power modules, the same number of redundant power modules are switched from hot standby state to normal working state. After the power module-level bypass mechanism is activated, the AC-AC inverter can still achieve nine-phase bridge arm operation.

[0045] (2) For each bridge arm, if the number of faulty main power modules on the bridge arm is greater than the number of redundant power modules, the bridge arm is determined to be faulty.

[0046] Specifically, in this embodiment of the invention, for each bridge arm, when the number of faulty main power modules is greater than the number of redundant power modules, since some faulty main power modules do not have redundant power modules to replace them, the entire bridge arm fails and can no longer operate normally, and the AC-AC frequency converter can no longer operate in nine phases.

[0047] (3) For each frequency converter module, when at least one bridge arm fails, the frequency converter module is determined to be faulty.

[0048] (4) For AC-AC converters, when only one converter module fails, the power transmission system is determined to be at the converter module level; when at least two converter modules fail, the power transmission system is determined to be at the converter level.

[0049] Specifically, when only one frequency converter module fails, the AC-AC frequency converter can achieve nine-phase to six-phase operation. The specific implementation methods are divided into the following two cases:

[0050] ①The three frequency conversion modules of the AC-AC frequency converter are labeled as frequency conversion module #1, frequency conversion module #2, and frequency conversion module #3. When the A-phase bridge arm of frequency conversion module #1 fails, and the bridge arms of frequency conversion modules #2 and #3 do not fail as a whole, or when the A-phase bridge arms of frequency conversion modules #1, #2, and #3 all fail, the A-phase bridge arms of frequency conversion modules #1, #2, and #3 are all bypassed. At this time, the AC-AC frequency converter switches from nine-phase operation to six-phase operation.

[0051] To achieve six-phase operation in scenario ① and low-frequency operation of AC system #2, the phase, amplitude, and frequency of phase A voltage and current can be virtually constructed based on the phase, amplitude, and frequency of voltage and current in phase B and phase C arms of the frequency converter module. Then, the operating state of the power modules in each phase B and phase C arm is controlled based on the three-phase arm voltage to achieve the frequency conversion function from power frequency to low frequency. The construction method can be a mature existing construction method, which will not be elaborated here.

[0052] ②The three frequency conversion modules of the AC-AC frequency converter are labeled as frequency conversion module #1, frequency conversion module #2, and frequency conversion module #3. When at least one phase arm of frequency conversion module #1 fails, and the bridge arms of frequency conversion modules #2 and #3 do not fail as a whole, the second-level fault transit method is adopted to start the frequency conversion module-level bypass mechanism, bypassing all three bridge arms of frequency conversion module #1. Frequency conversion modules #2 and #3 operate normally, and the AC-AC frequency converter switches from nine-phase operation to six-phase operation.

[0053] Specifically, in an AC-AC converter, when at least two converter modules fail, the power transmission system is determined to be a converter failure. Since the AC-AC converter cannot switch from nine-phase operation to six-phase operation, a third-level fault-passing method is adopted to activate the system-level bypass mechanism, bypassing all converter modules. The power transmission system then switches to power frequency operation, meaning that AC system #1 and AC system #2 no longer transmit power via frequency conversion, and both AC systems operate at power frequency.

[0054] Example 2

[0055] This invention provides a fault crossing system for a power transmission system, such as... Figure 5 As shown, it includes:

[0056] The detection module 2 is used to detect the operating status of the main power module on each bridge arm, and to obtain the number of faulty main power modules on each bridge arm based on the operating status of the main power module on each bridge arm. This module executes the method described in step S1 of embodiment 1, which will not be repeated here.

[0057] Bypass module 3 is used to execute the corresponding bypass mechanism based on the number of faulty main power modules and the number of redundant power modules on each bridge arm. The bypass mechanism includes: power module level bypass mechanism, frequency converter module level bypass mechanism, and system level bypass mechanism. This module executes the method described in step S2 of embodiment 1, which will not be repeated here.

[0058] Example 3

[0059] This invention provides a computer device, such as... Figure 6As shown, the system includes: at least one processor 401, such as a CPU (Central Processing Unit), at least one communication interface 403, a memory 404, and at least one communication bus 402. The communication bus 402 is used to enable communication between these components. The communication interface 403 may include a display screen or a keyboard; optionally, the communication interface 403 may also include a standard wired interface or a wireless interface. The memory 404 may be high-speed RAM (Random Access Memory) or non-volatile memory, such as at least one disk storage device. Optionally, the memory 404 may also be at least one storage device located remotely from the processor 401. The processor 401 can execute the fault-crossing method for the power transmission system of Embodiment 1. The memory 404 stores a set of program code, and the processor 401 calls the program code stored in the memory 404 to execute the fault-crossing method for the power transmission system of Embodiment 1.

[0060] The communication bus 402 can be a peripheral component interconnect (PCI) bus or an extended industry standard architecture (EISA) bus, etc. The communication bus 402 can be divided into an address bus, a data bus, and a control bus, etc. For ease of representation, Figure 6 The symbol is represented by only one line, but this does not mean that there is only one bus or one type of bus.

[0061] The memory 404 may include volatile memory, such as random-access memory (RAM); the memory may also include non-volatile memory, such as flash memory, hard disk drive (HDD) or solid-state drive (SSD); the memory 404 may also include a combination of the above types of memory.

[0062] The processor 401 can be a central processing unit (CPU), a network processor (NP), or a combination of CPU and NP.

[0063] The processor 401 may further include a hardware chip. This hardware chip may be an application-specific integrated circuit (ASIC), a programmable logic device (PLD), or a combination thereof. The PLD may be a complex programmable logic device (CPLD), a field-programmable gate array (FPGA), a generic array logic (GAL), or any combination thereof.

[0064] Optionally, the memory 404 is also used to store program instructions. The processor 401 can call the program instructions to implement the fault-crossing method of the power transmission system as described in Embodiment 1 of this application.

[0065] This invention also provides a computer-readable storage medium storing computer-executable instructions that can execute the fault-crossing method for the power transmission system of Embodiment 1. The storage medium can be a magnetic disk, optical disk, read-only memory (ROM), random access memory (RAM), flash memory, hard disk drive (HDD), or solid-state drive (SSD), etc.; the storage medium may also include combinations of the above types of memory.

[0066] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A fault-passing method for a power transmission system, characterized in that, The power transmission system includes: an AC-AC frequency converter, which is composed of multiple frequency conversion modules, each frequency conversion module being composed of multiple bridge arms, each bridge arm being connected to a single-phase AC transmission bus, and each bridge arm being composed of multiple power modules connected in series, the power modules including a main power module and redundant power modules; the fault crossing method includes: The operating status of the main power module on each bridge arm is detected, and the number of faulty main power modules on each bridge arm is obtained based on the operating status of the main power module on each bridge arm. Based on the number of faulty main power modules and the number of redundant power modules on each of the bridge arms, a corresponding bypass mechanism is executed. The bypass mechanism includes: power module-level bypass mechanism, frequency converter module-level bypass mechanism, and system-level bypass mechanism. The process of determining the fault type of the AC-AC inverter based on the number of faulty main power modules and the number of redundant power modules on each bridge arm includes: for each bridge arm, when the number of faulty main power modules on the bridge arm is not greater than the number of redundant modules, the bridge arm is determined to be operating normally; The process of determining the fault type of the AC-AC inverter based on the number of faulty main power modules and the number of redundant power modules on each bridge arm further includes: for each bridge arm, when the number of faulty main power modules on the bridge arm is greater than the number of redundant modules, the bridge arm is determined to be faulty. The process of determining the fault type of the AC-AC inverter based on the number of faulty main power modules and the number of redundant power modules on each of the bridge arms further includes: for each inverter module, when at least one bridge arm is faulty, the inverter module is determined to be faulty. The process of determining the fault type of the AC-AC inverter based on the number of faulty main power modules and the number of redundant power modules on each of the bridge arms further includes: for the AC-AC inverter, when only one inverter module fails, the power transmission system is determined to be a inverter module-level fault; when at least two inverter modules fail, the power transmission system is determined to be a converter fault. When only one frequency converter module fails, the AC-AC frequency converter achieves nine-phase to six-phase operation, i.e., a frequency converter module-level bypass mechanism is adopted. In the AC-AC frequency converter, when at least two frequency converter modules fail, the power transmission system is determined to be a converter failure, and a system-level bypass mechanism is adopted.

2. The fault-passing method for a power transmission system according to claim 1, characterized in that, The power module-level bypass mechanism is as follows: When the number of faulty main power modules on the bridge arm is not greater than the number of redundant power modules, the faulty main power modules are bypassed. Based on the number of faulty main power modules, the same number of redundant power modules are switched from hot standby to normal operation.

3. The fault-passing method for a power transmission system according to claim 1, characterized in that, The frequency converter module-level bypass mechanism includes: When a frequency converter module-level fault occurs in the power transmission system, the faulty frequency converter module is bypassed.

4. The fault-passing method for a power transmission system according to claim 1, characterized in that, The system-level bypass mechanism includes: When a converter failure occurs in the power transmission system, all frequency converter modules are bypassed, and the power transmission system switches to power frequency operation.

5. A fault transit system for a power transmission system, characterized in that, Based on the fault-passing method for a power transmission system according to claims 1-4, the system comprises: The detection module is used to detect the operating status of the main power modules on each bridge arm, and to obtain the number of faulty main power modules on each bridge arm based on the operating status of the main power modules on each bridge arm. The bypass module is used to execute the corresponding bypass mechanism based on the number of faulty main power modules and the number of redundant power modules on each bridge arm. The bypass mechanism includes: power module level bypass mechanism, frequency converter module level bypass mechanism, and system level bypass mechanism. The process of determining the fault type of the AC-AC inverter based on the number of faulty main power modules and the number of redundant power modules on each bridge arm includes: for each bridge arm, when the number of faulty main power modules on the bridge arm is not greater than the number of redundant modules, the bridge arm is determined to be operating normally. The process of determining the fault type of the AC-AC inverter based on the number of faulty main power modules and the number of redundant power modules on each bridge arm further includes: for each bridge arm, when the number of faulty main power modules on the bridge arm is greater than the number of redundant modules, the bridge arm is determined to be faulty. The process of determining the fault type of the AC-AC inverter based on the number of faulty main power modules and the number of redundant power modules on each of the bridge arms further includes: for each inverter module, when at least one bridge arm is faulty, the inverter module is determined to be faulty. The process of determining the fault type of the AC-AC inverter based on the number of faulty main power modules and the number of redundant power modules on each of the bridge arms further includes: for the AC-AC inverter, when only one inverter module fails, the power transmission system is determined to be a inverter module-level fault; when at least two inverter modules fail, the power transmission system is determined to be a converter fault. When only one frequency converter module fails, the AC-AC frequency converter achieves nine-phase to six-phase operation, i.e., a frequency converter module-level bypass mechanism is adopted. In the AC-AC frequency converter, when at least two frequency converter modules fail, the power transmission system is determined to be a converter failure, and a system-level bypass mechanism is adopted.

6. A computer device, characterized in that, include: At least one processor, and a memory communicatively connected to the at least one processor, wherein the memory stores instructions executable by the at least one processor, the instructions being executed by the at least one processor to cause the at least one processor to perform the fault crossing method for the power transmission system according to any one of claims 1-4.

7. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer instructions for causing the computer to perform the fault-crossing method for the power transmission system according to any one of claims 1-4.

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