A parallel processing method and platform for generator-transformer unit protection based on frequency-locked synchronization

Abstract

A kind of parallel processing method and platform of generator-transformer group protection based on frequency-locked synchronization, the generator-transformer group protection platform is divided into several protection processing subsystems according to protection object, each subsystem is connected to synchronization bus;Subsystem sends synchronization signal and the effective mark of signal to synchronization bus in sequence, and detects the synchronization signal on receiving bus, if effective synchronization signal can be received within preset delay time, then the subsystem enters frequency-locked synchronization operating mode, carries out generator-transformer group protection parallel processing, otherwise the subsystem enters autonomous operating mode.Each generator-transformer group protection processing subsystem in the application can not only frequency-locked synchronization load balancing operation, but also high-reliability autonomous operation.Both the synchronization, real-time performance and reliability of entire generator-transformer group protection processing are considered.

Description

Technical Field

[0001] This invention belongs to the field of power system relay protection technology, and relates to a parallel processing method and platform for generator-transformer group protection based on frequency locking synchronization. Background Technology

[0002] Large generator-transformer units are one of the most important components of modern power systems. With the continuous development of industrial technology, the capacity and automation level of individual units are constantly increasing, placing higher demands on the reliability of relay protection for generator-transformer units. The objects protected by large generator-transformer units include the main transformer, generator, high-voltage station service transformer, and excitation transformer. Furthermore, the diverse main wiring and operating conditions, along with the numerous protection function types and complex interfaces, place higher demands on the performance and reliability of the generator-transformer unit protection hardware platform.

[0003] Currently, the architecture of generator-transformer protection and processing platforms from mainstream domestic and international manufacturers mainly falls into the following two categories:

[0004] Option 1 involves a single processing system for all functions of the generator-transformer group protection, which is a multi-CPU serial processing system. This system includes an AD module for analog-to-digital conversion, a CPU module for protection logic processing, a digital input module, a trip / signal digital output module, a power supply module, etc., and the modules are connected serially.

[0005] Option two involves using multiple asynchronous sub-processing systems to handle the protection of the generator-transformer group, depending on the protected object. These sub-processing systems include a main transformer protection sub-processing system, a generator protection sub-processing system, and a high-voltage transformer protection sub-processing system. Each sub-processing system includes an independent AD module for analog-to-digital conversion and a CPU module for protection logic processing. The digital input module, trip / signal digital output module, and power supply module are shared by several sub-systems.

[0006] The advantage of Option 1 is that all analog quantities are acquired uniformly and all protection logic is completed in a single protection processing module. This ensures the synchronization and real-time performance of all protection processing in the generator-transformer unit, as well as the consistency of fault recordings. The disadvantage is that if the analog quantity conversion module or the protection logic processing module fails, all main transformer protection, generator protection, and high-voltage transformer protection will be lost, reducing the reliability of the entire protection system.

[0007] The advantage of Scheme 2 is that the generator protection system consists of a main transformer protection sub-processing system, a generator protection sub-processing system, and a power plant transformer protection sub-processing system. If the analog conversion module or protection logic processing module of one sub-processing system fails, only the affected sub-processing system exits, while other sub-systems can continue to operate normally. Compared to Scheme 1, the reliability of the entire protection system in Scheme 2 is greatly improved. The disadvantage is that each sub-system operates asynchronously; the analog acquisition and protection processing modules operate on their own cycles. It is difficult to use the analog acquisition results or protection processing results of other sub-systems for comprehensive judgment, or it increases the complexity of the platform design. Furthermore, it is difficult to merge the fault records of each sub-processing system, which is not conducive to fault analysis.

[0008] To ensure the reliability of protection for large generator-transformer units, it is urgent to improve the existing design methods for generator-transformer unit protection processing platforms and to study a design method for a highly reliable parallel processing platform for generator-transformer unit protection. Summary of the Invention

[0009] This invention provides a parallel processing method and platform for generator-transformer group protection based on frequency locking synchronization. Each generator-transformer group protection processing subsystem can operate in frequency locking synchronization load balancing mode, or operate autonomously with high reliability. This balances the synchronization, real-time performance, and reliability of the entire generator-transformer group protection processing.

[0010] The present invention adopts the following technical solution:

[0011] A parallel processing method for generator-transformer group protection based on frequency locking synchronization, the method comprising the following steps:

[0012] Step 1: Divide the generator-transformer group protection into several protection processing subsystems according to the protected objects, and connect each subsystem to the synchronization bus;

[0013] Step 2: The subsystem sequentially sends synchronization signals and signal validity flags to the synchronization bus and detects the synchronization signals on the receiving bus. If a valid synchronization signal is received within the preset delay time, the subsystem enters the frequency-locked synchronization operation mode to perform parallel processing of generator-transformer group protection; otherwise, the subsystem enters the autonomous operation mode.

[0014] The present invention further includes the following preferred embodiments:

[0015] Preferably, the subsystem is an independent physical board or different functional areas on the same physical board.

[0016] Preferably, each subsystem includes an independent AD module for analog-to-digital conversion and a CPU module for protection logic processing.

[0017] Preferably, each subsystem can receive a synchronization signal on the synchronization bus and lock the synchronization signal frequency, and can also send a synchronization signal and a valid flag of the signal to the synchronization bus for parallel redundant real-time calculation, and exchange information in real time through the synchronization bus to output a unified output result.

[0018] Preferably, the synchronization bus is a multimode bus (SMBG).

[0019] Preferably, after the generator-transformer group protection is powered on, each subsystem determines its serial number through a pre-set identification mark ID;

[0020] The synchronization signal sent by a subsystem to the synchronization bus includes its own ID so that other subsystems can identify it.

[0021] Preferably, the preset time is (m+1)*△t, where m is the total number of subsystems and △t is the time of one minimum frequency cycle of the synchronization signal.

[0022] Preferably, step 2 specifically includes:

[0023] Step 21: After the generator-transformer group protection is powered on, the first subsystem sends the synchronization signal and the signal's validity flag to the synchronization bus;

[0024] Step 22: All subsystems detect the synchronization signal on the receiving bus and determine whether there is a valid synchronization signal. If there is, the synchronization signal is locked, and the AD module and CPU module of the subsystem work according to the rhythm of the synchronization signal and enter the frequency-locked synchronization operation mode.

[0025] Step 23: If the nth subsystem still does not receive a valid synchronization signal after waiting for n*Δt time, it sends the synchronization signal and signal validity flag of this subsystem to the synchronization bus and returns to step 22.

[0026] Where n is the subsystem number, m≥n≥2, and m is the total number of subsystems;

[0027] Step 24: If all subsystems still do not receive a valid synchronization signal after waiting for (m+1)*△t time, then perform analog quantity conversion and protection logic processing according to the working rhythm of this subsystem, enter the autonomous operation mode, and return to step 22.

[0028] Preferably, in step 22, if multiple valid synchronization signals exist simultaneously on the synchronization bus, the subsystem only receives the valid synchronization signal with the smallest ID number.

[0029] Upon receiving a valid synchronization signal, the subsystem locks the pulse edge and frequency of the synchronization signal, causing the AD module and CPU module of this subsystem to operate according to the rhythm of the synchronization signal, ensuring that the sampling and protection logic processing of the subsystem are in a synchronized working state with the system that issued the synchronization signal.

[0030] A parallel processing platform for generator-transformer group protection based on frequency locking synchronization is provided, comprising several protection processing subsystems and a synchronization bus.

[0031] The protection processing subsystems are divided according to the protected objects, and each subsystem is connected to the synchronization bus;

[0032] The protection processing subsystem is used to send synchronization signals and valid flags to the synchronization bus in sequence, and to detect the synchronization signals on the receiving bus. If a valid synchronization signal is received within a preset delay time, the subsystem enters the frequency-locked synchronization operation mode to perform parallel processing of generator-transformer group protection; otherwise, the subsystem enters the autonomous operation mode.

[0033] The beneficial effects of this invention are compared with those of the prior art:

[0034] This invention follows the principles of frequency locking synchronization and autonomous balancing, and designs the generator-transformer group protection architecture based on multi-cluster redundant parallel computing. It upgrades from previous serial or asynchronous parallel processing methods to synchronous parallel processing. The generator-transformer group protection is divided into multiple subsystems according to the protected object. When no system fault occurs, each subsystem operates synchronously with frequency locking, achieving collaborative work, maintaining subsystem load balance, and ensuring the synchronization, real-time performance, and consistency of fault recordings of the entire protection system. When a subsystem fails, only the faulty subsystem is affected; other subsystems can still operate synchronously with frequency locking. When other subsystems are all in a fault state or the synchronization bus fails, the non-faulty subsystems can still operate autonomously, significantly improving the safety and reliability of the entire generator-transformer group protection system.

[0035] This invention divides the generator-transformer protection platform into several parallel protection subsystems based on the protected objects. Each subsystem is connected to a synchronization bus. The subsystem detects the synchronization signal on the bus. If a valid synchronization signal is detected, it enters the frequency-locked synchronization operation mode; otherwise, it sends its own synchronization signal to the bus. If no valid synchronization signal is found on the bus after a preset delay time, all subsystems enter the autonomous operation mode. In the autonomous operation mode, the subsystem detects the synchronization signal on the bus in real time. Once a valid synchronization signal is detected, it immediately resumes the frequency-locked synchronization operation mode. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of the parallel processing platform architecture for generator sets of the present invention;

[0037] Figure 2 This is a schematic diagram of the parallel processing logic for generator group protection in this invention;

[0038] Figure 3 This is a schematic diagram of the parallel processing platform architecture for generator-transformer group protection used in this embodiment of the invention. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of this invention. The embodiments described in this application are merely some embodiments of this invention, and not all embodiments. Based on the spirit of this invention, other embodiments obtained by those skilled in the art without creative effort are all within the protection scope of this invention.

[0040] like Figure 1-2 As shown, Embodiment 1 of the present invention provides a parallel processing method for generator-transformer group protection based on frequency locking synchronization. In a preferred but non-limiting embodiment of the present invention, the method includes the following steps:

[0041] Step 1: Divide the generator-transformer group protection platform into several protection processing subsystems according to the protected objects, and connect each subsystem to the synchronization bus;

[0042] More preferably, the subsystem can be an independent physical board or different functional areas on the same physical board.

[0043] The synchronization bus is a Smart Multi-mode Bus Group (SMBG).

[0044] like Figure 3 The generator-transformer protection platform is divided into a generator protection processing subsystem, a main transformer protection processing subsystem, and a high-voltage transformer protection processing subsystem according to the different protected objects. Each subsystem is connected to the synchronization bus.

[0045] Each subsystem includes an independent AD module for analog-to-digital conversion, a CPU module for protection logic processing, etc. It can receive synchronization signals on the synchronization bus and lock the synchronization signal frequency. It can also send synchronization signals and valid flags of the signals to the synchronization bus for parallel redundant real-time calculation. It can also exchange information in real time through the synchronization bus and output a unified output result.

[0046] Step 2: The subsystem sequentially sends synchronization signals and signal validity flags to the synchronization bus and detects the synchronization signals on the receiving bus. If a valid synchronization signal is received within the preset delay time, the subsystem enters the frequency-locked synchronization operation mode to perform parallel processing of generator-transformer group protection; otherwise, the subsystem enters the autonomous operation mode.

[0047] More preferably, the preset time is (m+1)*△t, where m is the total number of subsystems and △t is the time of one minimum frequency cycle of the synchronization signal.

[0048] After the generator-transformer group protection platform is powered on, each subsystem determines its serial number through a pre-set identification mark ID;

[0049] The synchronization signal sent by a subsystem to the synchronization bus includes its own ID so that other subsystems can identify it.

[0050] Step 2 specifically includes:

[0051] Step 21: After the generator-transformer group protection platform is powered on, the first subsystem sends the synchronization signal and the signal validity flag to the synchronization bus;

[0052] According to the preset settings, the ID of the generator protection processing subsystem is 1, the ID of the main transformer protection processing subsystem is 2, and the ID of the high-voltage transformer protection processing subsystem is 3.

[0053] Therefore, the generator protection processing subsystem first sends the synchronization signal and the valid flag of the signal to the bus;

[0054] Step 22: All subsystems detect the synchronization signal on the receiving bus. After determining that the signal is valid, they lock the synchronization signal. The AD module and CPU module work according to the rhythm of the synchronization signal and enter the frequency-locked synchronization operation mode.

[0055] More preferably, if multiple valid synchronization signals exist simultaneously on the synchronization bus, the subsystem only receives the valid synchronization signal with the smallest ID number. This is a preventative measure in certain abnormal situations. Theoretically, there should not be multiple synchronization signals, but this judgment is added to prevent the subsystem from mistakenly sending synchronization signals to the bus after losing control.

[0056] Upon receiving a valid synchronization signal, the subsystem locks the pulse edge and frequency of the synchronization signal, causing the AD module and CPU module of this subsystem to operate according to the rhythm of the synchronization signal, ensuring that the sampling and protection logic processing of the subsystem are in a synchronized working state with the system that issued the synchronization signal.

[0057] If multiple valid synchronization signals exist on the bus at the same time, other rules can also be used, as long as the source of the synchronization signal can be uniquely selected.

[0058] Step 23: If the nth subsystem still does not receive a valid synchronization signal after waiting for n*Δt time, it sends the synchronization signal and signal validity flag of this subsystem to the synchronization bus and returns to step 22.

[0059] Where n is the subsystem number, m≥n≥2, and m is the total number of subsystems;

[0060] Step 23 can prevent multiple subsystems from sending synchronization signals to the bus simultaneously.

[0061] In this embodiment, if the generator protection processing subsystem fails and does not send the synchronization signal to the bus, the main transformer protection processing subsystem will send its own synchronization signal and signal validity flag to the bus after 2*Δt time. If the main transformer protection processing subsystem also fails and does not send the synchronization signal to the bus, the high-voltage transformer protection processing subsystem will send its own synchronization signal and signal validity flag to the bus after 3*Δt time.

[0062] Step 24: If all protection processing subsystems still do not receive a valid synchronization signal after waiting for 4*Δt time, they will perform analog quantity conversion, protection logic processing, and other tasks according to the working rhythm of their respective subsystems, enter autonomous operation mode, and return to step 22. That is, all subsystems will detect the synchronization signal on the receiving bus. If a valid synchronization signal is detected, the synchronization signal will be locked and the frequency-locked synchronization operation mode will be entered. Otherwise, the synchronization signal and valid flag of their respective subsystems will be sent to the bus.

[0063] Step 24 enables this subsystem to continue operating autonomously even when other subsystems are in a faulty state or the synchronization bus fails.

[0064] Embodiment 2 of the present invention provides a parallel processing platform for generator-transformer group protection based on frequency locking synchronization obtained according to the above method, including several protection processing subsystems and a synchronization bus:

[0065] The protection processing subsystems are divided according to the protected objects, and each subsystem is connected to the synchronization bus;

[0066] The protection processing subsystem is used to send synchronization signals and valid flags to the synchronization bus in sequence, and to detect the synchronization signals on the receiving bus. If a valid synchronization signal is received within a preset delay time, the subsystem enters the frequency-locked synchronization operation mode to perform parallel processing of generator-transformer group protection; otherwise, the subsystem enters the autonomous operation mode.

[0067] The beneficial effects of this invention are compared with those of the prior art:

[0068] This invention follows the principles of frequency locking synchronization and autonomous balancing, and designs the generator-transformer group protection architecture based on multi-cluster redundant parallel computing. It upgrades from previous serial or asynchronous parallel processing methods to synchronous parallel processing. The generator-transformer group protection is divided into multiple subsystems according to the protected object. When no system fault occurs, each subsystem operates synchronously with frequency locking, achieving collaborative work, maintaining subsystem load balance, and ensuring the synchronization, real-time performance, and consistency of fault recordings of the entire protection system. When a subsystem fails, only the faulty subsystem is affected; other subsystems can still operate synchronously with frequency locking. When other subsystems are all in a fault state or the synchronization bus fails, the non-faulty subsystems can still operate autonomously, significantly improving the safety and reliability of the entire generator-transformer group protection system.

[0069] This invention divides the generator-transformer protection platform into several parallel protection subsystems based on the protected objects. Each subsystem is connected to a synchronization bus. The subsystem detects the synchronization signal on the bus. If a valid synchronization signal is detected, it enters the frequency-locked synchronization operation mode; otherwise, it sends its own synchronization signal to the bus. If no valid synchronization signal is found on the bus after a preset delay time, all subsystems enter the autonomous operation mode. In the autonomous operation mode, the subsystem detects the synchronization signal on the bus in real time. Once a valid synchronization signal is detected, it immediately resumes the frequency-locked synchronization operation mode.

[0070] This disclosure can be a system, method, and / or computer program product. A computer program product may include a computer-readable storage medium having computer-readable program instructions loaded thereon for causing a processor to implement various aspects of this disclosure.

[0071] Computer-readable storage media can be tangible devices capable of holding and storing instructions for use by an instruction execution device. Computer-readable storage media can be, for example—but not limited to—electrical storage devices, magnetic storage devices, optical storage devices, electromagnetic storage devices, semiconductor storage devices, or any suitable combination of the foregoing. More specific examples (a non-exhaustive list) of computer-readable storage media include: portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), static random access memory (SRAM), portable compact disc read-only memory (CD-ROM), digital multifunction disc (DVD), memory sticks, floppy disks, mechanical encoding devices, such as punch cards or recessed protrusions storing instructions thereon, and any suitable combination of the foregoing. The computer-readable storage media used herein are not to be construed as transient signals themselves, such as radio waves or other freely propagating electromagnetic waves, electromagnetic waves propagating through waveguides or other transmission media (e.g., light pulses through fiber optic cables), or electrical signals transmitted through wires.

[0072] The computer-readable program instructions described herein can be downloaded from computer-readable storage media to various computing / processing devices, or downloaded via a network, such as the Internet, local area network, wide area network, and / or wireless network, to an external computer or external storage device. The network may include copper transmission cables, fiber optic transmission, wireless transmission, routers, firewalls, switches, gateway computers, and / or edge servers. A network adapter card or network interface in each computing / processing device receives the computer-readable program instructions from the network and forwards them to the computer-readable storage media in the respective computing / processing device.

[0073] Computer program instructions used to perform the operations of this disclosure may be assembly instructions, instruction set architecture (ISA) instructions, machine instructions, machine-dependent instructions, microcode, firmware instructions, status setting data, or source code or object code written in any combination of one or more programming languages, including object-oriented programming languages ​​such as Smalltalk, C++, etc., and conventional procedural programming languages ​​such as the "C" language or similar programming languages. The computer-readable program instructions may execute entirely on the user's computer, partially on the user's computer, as a standalone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving a remote computer, the remote computer may be connected to the user's computer via any type of network—including a local area network (LAN) or a wide area network (WAN)—or may be connected to an external computer (e.g., via the Internet using an Internet service provider). In some embodiments, electronic circuitry, such as programmable logic circuitry, field-programmable gate arrays (FPGAs), or programmable logic arrays (PLAs), is personalized by utilizing the status information of the computer-readable program instructions to implement various aspects of this disclosure.

[0074] Various aspects of this disclosure are described herein with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this disclosure. It should be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer-readable program instructions.

[0075] These computer-readable program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing apparatus to produce a machine such that, when executed by the processor of the computer or other programmable data processing apparatus, they create means for implementing the functions / actions specified in one or more blocks of the flowchart and / or block diagram. These computer-readable program instructions can also be stored in a computer-readable storage medium that causes a computer, programmable data processing apparatus, and / or other device to operate in a particular manner; thus, the computer-readable medium storing the instructions comprises an article of manufacture that includes instructions for implementing aspects of the functions / actions specified in one or more blocks of the flowchart and / or block diagram.

[0076] Computer-readable program instructions may also be loaded onto a computer, other programmable data processing apparatus, or other device to cause a series of operational steps to be performed on the computer, other programmable data processing apparatus, or other device to produce a computer-implemented process, thereby causing the instructions executed on the computer, other programmable data processing apparatus, or other device to perform the functions / actions specified in one or more boxes of a flowchart and / or block diagram.

[0077] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to various embodiments of the present disclosure. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of an instruction containing one or more executable instructions for implementing a specified logical function. In some alternative implementations, the functions marked in the blocks may occur in a different order than those shown in the drawings. For example, two consecutive blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in the block diagrams and / or flowcharts, and combinations of blocks in the block diagrams and / or flowcharts, may be implemented using a dedicated hardware-based system that performs the specified function or action, or using a combination of dedicated hardware and computer instructions.

[0078] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the protection scope of the claims of the present invention.

Claims

1. A parallel processing method for generator-transformer group protection based on frequency locking synchronization, characterized in that: The method includes the following steps: Step 1: Divide the generator-transformer group protection into several protection processing subsystems according to the protected objects, and connect each subsystem to the synchronization bus; Step 2: The subsystem sequentially sends synchronization signals and signal validity flags to the synchronization bus and detects the synchronization signals on the receiving bus. If a valid synchronization signal is received within a preset delay time, the subsystem enters the frequency-locked synchronization operation mode to perform parallel processing of generator-transformer group protection; otherwise, the subsystem enters the autonomous operation mode, which specifically includes: Step 21: After the generator-transformer group protection is powered on, the first subsystem sends the synchronization signal and the signal's validity flag to the synchronization bus; Step 22: All subsystems detect the synchronization signal on the receiving bus and determine whether there is a valid synchronization signal. If there is, the synchronization signal is locked, and the AD module and CPU module of the subsystem work according to the rhythm of the synchronization signal and enter the frequency-locked synchronization operation mode. Step 23: If the nth subsystem is waiting If no valid synchronization signal is received after a certain period of time, the synchronization signal and signal validity flag of this subsystem are sent to the synchronization bus, and the process returns to step 22. Where n is the subsystem number, m≥n≥2, m is the total number of subsystems, and Δt is the time of one minimum frequency cycle of the synchronization signal; Step 24: If all subsystems are waiting If no valid synchronization signal is received after a certain time, the analog quantity conversion and protection logic processing will be performed according to the working rhythm of this subsystem, and the system will enter the autonomous operation mode and return to step 22.

2. The parallel processing method for generator-transformer group protection based on frequency locking synchronization according to claim 1, characterized in that: The subsystem is an independent physical board or different functional areas on the same physical board.

3. The parallel processing method for generator-transformer group protection based on frequency locking synchronization according to claim 1, characterized in that: Each subsystem includes an independent AD module for analog-to-digital conversion and a CPU module for protection logic processing.

4. The parallel processing method for generator-transformer group protection based on frequency locking synchronization according to claim 1, characterized in that: Each subsystem can receive synchronization signals from the synchronization bus and lock the synchronization signal frequency. It can also send synchronization signals and valid flags of the signals to the synchronization bus for parallel redundant real-time calculations. It can also exchange information in real time through the synchronization bus and output a unified output result.

5. The parallel processing method for generator-transformer group protection based on frequency locking synchronization according to claim 1, characterized in that: The synchronization bus is a multimode bus (SMBG).

6. The parallel processing method for generator-transformer group protection based on frequency locking synchronization according to claim 1, characterized in that: After the generator-transformer unit protection is powered on, each subsystem determines its serial number through a pre-set identification mark ID; The synchronization signal sent by a subsystem to the synchronization bus includes its own ID so that other subsystems can identify it.

7. The parallel processing method for generator-transformer group protection based on frequency locking synchronization according to claim 1, characterized in that: In step 22, if multiple valid synchronization signals exist simultaneously on the synchronization bus, the subsystem will only receive the valid synchronization signal with the smallest ID number. Upon receiving a valid synchronization signal, the subsystem locks the pulse edge and frequency of the synchronization signal, causing the AD module and CPU module of this subsystem to operate according to the rhythm of the synchronization signal, ensuring that the sampling and protection logic processing of the subsystem are in a synchronized working state with the system that issued the synchronization signal.

8. The parallel processing platform for generator-transformer group protection based on frequency locking synchronization obtained by the method according to any one of claims 1-7, characterized in that: The platform includes several protection processing subsystems and a synchronization bus: The protection processing subsystems are divided according to the protected objects, and each subsystem is connected to the synchronization bus; The protection processing subsystem is used to send synchronization signals and valid flags to the synchronization bus in sequence, and to detect the synchronization signals on the receiving bus. If a valid synchronization signal is received within a preset delay time, the subsystem enters the frequency-locked synchronization operation mode to perform parallel processing of generator-transformer group protection; otherwise, the subsystem enters the autonomous operation mode.

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