Power plant safety and stability control device line N-2 fault anti-misjudgment method and device, storage medium and electronic equipment

Abstract

The embodiment of the invention provides a power plant safety and stability control device line N-2 fault anti-misjudgment method and device, a storage medium and electronic equipment, and relates to the field of line fault judgment. The method comprises the following steps: judging whether the sub-line meets a tripping action condition or not based on a switch position signal on the sub-line and A, B and C three-phase position signals of each switch; according to the active power of the sub-line, judging whether the line N-2 meets a fault active power sudden change value anti-error condition or not; according to the generator tripping amount of the line N-2, judging whether the line N-2 meets a fault generator tripping amount anti-error condition or not; and when each sub-line satisfies a tripping action condition, the line N-2 satisfies a fault active power sudden change value anti-error condition and the line N-2 satisfies a fault generator tripping amount anti-error condition, judging that the line N-2 has a fault. According to the invention, the possibility of line N-2 fault misjudgment caused by abnormal related electric quantity of the line can be avoided, and the reliability of the safety and stability control device and the stability of the power system are improved.

Description

Technical Field

[0001] The present application relates to the technical field of line fault judgment, and in particular to a method, device, storage medium and electronic equipment for preventing misjudgment of line N-2 fault of a power plant safety and stability control device. Background Art

[0002] Safety and stability control devices are control devices installed in power plants or substations to ensure the stability of power systems in the event of large disturbances. They implement functions such as generator tripping, load shedding, rapid output reduction, and emergency DC power boost or drop, and are an important second line of defense for maintaining the safe and stable operation of power systems. The main functions of power plant safety and stability control devices include local functions and the function of receiving remote commands from the safety and stability control system. Local functions typically include line N-2 fault generator tripping, line overload generator tripping, high-frequency generator tripping, and so on. A line N-2 fault refers to the tripping of two lines at the same section of a power system under normal operation. At this time, the safety and stability control device will usually initiate generator tripping measures according to the preset strategy to ensure the safe and stable operation of the power system.

[0003] Safety and stability control devices collect line voltages and currents in real time, typically using electrical quantities like active power and RMS current to determine line operating status. However, due to factors such as failures in the voltage and current acquisition modules, secondary circuit faults, and external interference, using only simple electrical quantities to determine line operating status can lead to misjudgments, potentially compromising the safe and stable operation of the power system. Summary of the Invention

[0004] The embodiments of the present application provide a method, device, storage medium and electronic equipment for preventing misjudgment of a fault in line N-2 of a power plant safety and stability control device to solve the technical problems existing in the prior art.

[0005] Other features and advantages of the present application will become apparent from the following detailed description, or may be learned in part by practice of the present application.

[0006] According to a first aspect of an embodiment of the present application, a method for preventing misjudgment of a fault in line N-2 of a power plant safety and stability control device is provided, wherein the line N-2 includes at least three sub-lines, each sub-line is provided with a first switch and a second switch, each of the first switch and the second switch is provided with three phases A, B, and C, and the position signals of the phases A, B, and C of each switch are connected to the safety and stability control device, comprising: Determine whether the sub-circuit meets the tripping conditions based on the switch position signal on the sub-circuit and the A, B, and C three-phase position signals of each switch; Set the fault active power sudden change value error prevention condition according to the active power of the sub-line, and determine whether line N-2 meets the fault active power sudden change value error prevention condition; Set the fault tripping quantity error prevention condition based on the tripping quantity of line N-2, and determine whether line N-2 meets the fault tripping quantity error prevention condition; When each sub-line meets the tripping action conditions, and line N-2 meets the fault active power sudden change value prevention conditions and line N-2 meets the fault tripping amount prevention conditions, it is determined that line N-2 has a fault.

[0007] In some embodiments of the present application, based on the aforementioned solution, determining whether a sub-circuit meets a tripping condition based on the switch position signal on the sub-circuit and the A, B, and C three-phase position signals of each switch includes: When the first switch position signal access control word on any sub-line is set to "1" and the second switch position signal access control word is set to "1", and any phase of the position signal of the three phases A, B, and C of the first switch or the position signal of the three phases A, B, and C of the second switch changes from closed to open, it is judged that the sub-line meets the tripping action conditions.

[0008] In some embodiments of the present application, based on the aforementioned solution, setting a fault active power sudden change value error prevention condition according to the active power of the sub-line and determining whether line N-2 meets the fault active power sudden change value error prevention condition includes: When the line N-2 includes four sub-lines, the judgment formula for preventing the error condition of the fault active power sudden change value is set according to the real-time active power of the four sub-lines: ; in, Indicates the real-time active power of sub-line three, Indicates the real-time active power of sub-line 4, Indicates the active power of sub-line 3 200ms before sub-line 1 and sub-line 2 trip due to fault. Indicates the active power of sub-line 4 200ms before sub-line 1 and sub-line 2 trip due to fault. Indicates the active power of sub-line 1 200ms before sub-line 1 and sub-line 2 trip due to fault. Indicates the active power of sub-circuit 2 200ms before the fault trip of sub-circuit 1 and sub-circuit 2. x is the set threshold value, ranging from 0 to 100. When the active powers of the four sub-lines in line N-2 satisfy the judgment formula, it is determined that line N-2 meets the fault active power sudden change value error prevention condition.

[0009] In some embodiments of the present application, based on the aforementioned solution, setting a fault tripping amount error prevention condition based on the tripping amount of line N-2 and determining whether line N-2 meets the fault tripping amount error prevention condition includes: The judgment formula for setting the fault tripping amount error prevention condition based on the tripping amount of line N-2 is as follows: ; in, Indicates the amount of generator disconnection after line N-2 fault, which is automatically calculated by the safety and stability control device according to the preset strategy. Indicates the anti-error setting value of the safety and stability control device for the tripping amount, which is set above the total active power of the power plant; When the tripping amount after the fault of line N-2 satisfies the judgment formula, it is determined that line N-2 meets the fault tripping amount anti-error condition.

[0010] In some embodiments of the present application, based on the above solution, the method further includes: When the first switch or the second switch on any sub-line is under maintenance or testing, the switch position signal access control word is set to "0", and the switch position signal is not used as the basis for judging line tripping.

[0011] According to a second aspect of an embodiment of the present application, a device for preventing misjudgment of a fault in line N-2 of a power plant safety and stability control device is provided, which is applied to the method according to the first aspect, comprising: A first judgment unit is used to judge whether the sub-circuit meets the tripping action condition based on the switch position signal on the sub-circuit and the A, B, and C three-phase position signals of each switch; The second judgment unit is used to set a fault active power sudden change value error prevention condition according to the active power of the sub-line, and judge whether the line N-2 meets the fault active power sudden change value error prevention condition; a third judgment unit, configured to set a fault tripping amount error prevention condition according to the tripping amount of line N-2, and to judge whether line N-2 satisfies the fault tripping amount error prevention condition; The fourth judgment unit is used to judge that line N-2 has a fault when each sub-line meets the tripping action condition, line N-2 meets the fault active power sudden change value prevention condition, and line N-2 meets the fault tripping amount prevention condition.

[0012] According to a third aspect of an embodiment of the present application, a computer-readable storage medium is provided, wherein the storage medium stores computer instructions. When the computer instructions are executed on a computer, the computer executes the method according to the first aspect.

[0013] According to a fourth aspect of the embodiments of the present application, there is provided an electronic device, including: a memory and a processor; The memory is used to store computer instructions; The processor is configured to call the computer instructions stored in the memory so that the electronic device executes the method according to the first aspect.

[0014] The technical solution of the present application adopts the line switch position signal, the sudden change value of the line active power, etc. as the conditions for preventing misjudgment of the line N-2 fault, which can avoid the possibility of misjudgment of the line N-2 fault due to abnormalities in line-related electrical quantities, and improve the reliability of the safety and stability control device and the stability of the power system.

[0015] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings are incorporated into and constitute a part of the specification, illustrating embodiments consistent with the present application and, together with the specification, explaining the principles of the present application. Obviously, the drawings described below are only some embodiments of the present application, and those skilled in the art can derive other drawings based on these drawings without inventive effort. In the drawings: Figure 1 A flow chart showing a method for preventing misjudgment of a fault in line N-2 of a power plant safety and stability control device according to an embodiment of the present application is shown; Figure 2 FIG2 shows a schematic diagram of a line N-2 according to an embodiment of the present application; Figure 3 A block diagram of a device for preventing misjudgment of a power plant safety and stability control device line N-2 fault according to an embodiment of the present application is shown; Figure 4 A block diagram of an electronic device according to an embodiment of the present application is shown; Figure 5 A schematic diagram of the structure of a computer system suitable for implementing an electronic device according to an embodiment of the present application is shown. DETAILED DESCRIPTION

[0017] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this application will be thorough and complete and will fully convey the concepts of the example embodiments to those skilled in the art.

[0018] In addition, described feature, structure or characteristic can be combined in one or more embodiments in any suitable manner.In the following description, many specific details are provided so as to provide a full understanding of the embodiments of the present application. However, it will be appreciated by those skilled in the art that the technical scheme of the present application can be put into practice without one or more of the specific details, or other methods, components, devices, steps etc. can be adopted. In other cases, known methods, devices, implementations or operations are not shown or described in detail to avoid blurring the various aspects of the application.

[0019] The block diagrams shown in the accompanying drawings are merely functional entities and do not necessarily correspond to physically separate entities. That is, these functional entities may be implemented in software, in one or more hardware modules or integrated circuits, or in different networks and / or processor devices and / or microcontroller devices.

[0020] The flowcharts shown in the accompanying drawings are for illustrative purposes only and do not necessarily include all contents and operations / steps, nor must they be executed in the order described. For example, some operations / steps may be decomposed, while others may be combined or partially combined. Therefore, the actual execution order may vary depending on the actual situation.

[0021] It should be noted that the terms "first," "second," and the like in the specification and claims of this application and the accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, such that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described.

[0022] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0023] The following will describe some embodiments of the present application in detail with reference to the accompanying drawings. In the absence of conflict, the following embodiments and features therein may be combined with each other.

[0024] See also Figure 1 , shows a flow chart of a method for preventing misjudgment of a fault in line N-2 of a power plant safety and stability control device according to an embodiment of the present application.

[0025] like Figure 1As shown, a method for preventing misjudgment of a fault in line N-2 of a power plant safety and stability control device is presented, specifically comprising steps S100 to S400.

[0026] It should be noted that, in this embodiment, the line N-2 includes at least three sub-lines, each sub-line is provided with a first switch and a second switch, the first switch and the second switch are both provided with three phases A, B, and C, and the A, B, and C phase position signals of each switch are connected to the safety and stability control device.

[0027] For example, Figure 2 As shown, a line N-2 is shown, in which sub-line 1, sub-line 2, sub-line 3 and sub-line 4 are set; each sub-line is provided with two line switches, such as sub-line 1 is provided with two line switches 1 and 2, and sub-line 2 is provided with two line switches 3 and 4, and each line switch is provided with three phases A, B and C.

[0028] Specifically, the method includes: refer to Figure 1 , step S100, based on the switch position signal on the sub-line and the A, B, and C three-phase position signals of each switch, it is determined whether the sub-line meets the tripping action conditions.

[0029] In some feasible embodiments, based on the above solution, step S100 specifically includes: When the first switch position signal access control word on any sub-line is set to "1" and the second switch position signal access control word is set to "1", and any phase of the position signal of the three phases A, B, and C of the first switch or the position signal of the three phases A, B, and C of the second switch changes from closed to open, it is judged that the sub-line meets the tripping action conditions.

[0030] For example, Figure 2 Take sub-circuit 1 and sub-circuit 2 in as an example.

[0031] If the sub-circuit 1 switch 1 position signal access control word is set to "1", the sub-circuit 1 switch 2 position signal access control word is set to "1", and any phase of the sub-circuit 1 switch 1 A, B, C phase position signal or the sub-circuit 1 switch 2 A, B, C phase position signal changes from the closed position to the open position, then it is judged that the sub-circuit 1 meets the tripping action conditions; If the position signal access control word of switch 3 of sub-circuit 2 is set to "1", the position signal access control word of switch 4 of sub-circuit 2 is set to "1", and any phase of the A, B, C phase position signal of switch 3 of sub-circuit 2 or the A, B, C phase position signal of switch 4 of sub-circuit 2 changes from the closed position to the open position, then it is judged that sub-circuit 2 meets the tripping action conditions.

[0032] Continue to refer Figure 1 In step S200, a fault active power mutation value error prevention condition is set according to the active power of the sub-line, and it is determined whether line N-2 meets the fault active power mutation value error prevention condition.

[0033] In some feasible embodiments, based on the above solution, step S200 includes: When the line N-2 includes four sub-lines, the judgment formula for preventing the error condition of the fault active power sudden change value is set according to the real-time active power of the four sub-lines: ; in, Indicates the real-time active power of sub-line three, Indicates the real-time active power of sub-line 4, Indicates the active power of sub-line 3 200ms before sub-line 1 and sub-line 2 trip due to fault. Indicates the active power of sub-line 4 200ms before sub-line 1 and sub-line 2 trip due to fault. Indicates the active power of sub-line 1 200ms before sub-line 1 and sub-line 2 trip due to fault. Indicates the active power of sub-circuit 2 200ms before the fault trip of sub-circuit 1 and sub-circuit 2. x is the set threshold value, ranging from 0 to 100. When the active powers of the four sub-lines in line N-2 satisfy the judgment formula, it is determined that line N-2 meets the fault active power sudden change value error prevention condition.

[0034] It can be understood that in this embodiment, when sub-circuit 1 and sub-circuit 2 trip due to a fault, the active power of sub-circuit 1 and sub-circuit 2 will be transferred to sub-circuit 3 and sub-circuit 4. Therefore, before the safety and stability control device is activated to trip the generator, the increment of the sum of the real-time active power of sub-circuit 3 and sub-circuit 4 after the fault trip should be the sum of the active power of sub-circuit 1 and sub-circuit 2 before the trip, that is, ( + )-( + )=( + ). Therefore, when line N-2 fails, the error prevention condition of the active power sudden change value of line N-2 is met, that is, ( + )-( + )≥25%( + ), here 25% is an adjustable set value, which can be adjusted according to the actual situation. However, considering that this condition is an anti-error condition, this set value should not be set too large to avoid the anti-error condition being too strict and causing the condition to refuse to operate.

[0035] Continue to refer Figure 1 In step S300, a fault tripping amount preventing error condition is set according to the tripping amount of line N-2, and it is determined whether line N-2 meets the fault tripping amount preventing error condition.

[0036] In some feasible embodiments, based on the above solution, step S300 includes: The judgment formula for setting the fault tripping amount error prevention condition based on the tripping amount of line N-2 is as follows: ; in, Indicates the amount of generator disconnection after line N-2 fault, which is automatically calculated by the safety and stability control device according to the preset strategy. Indicates the anti-error setting value of the safety and stability control device for the tripping amount, which is set above the total active power of the power plant; When the tripping amount after the fault of line N-2 satisfies the judgment formula, it is determined that line N-2 meets the fault tripping amount anti-error condition.

[0037] It should be noted that when line N-2 fails, the number of disconnected generators is At 0 and safety and stability control device to prevent missetting of cutting amount If it exceeds this range, the cutting amount is considered invalid and will not be executed.

[0038] Continue to refer Figure 1 In step S400, when each sub-line meets the tripping action condition, and line N-2 meets the fault active power sudden change value error prevention condition and line N-2 meets the fault tripping amount error prevention condition, it is determined that line N-2 has a fault.

[0039] In some feasible embodiments, based on the above solution, the method further includes: When the first switch or the second switch on any sub-line is under maintenance or testing, the switch position signal access control word is set to "0", and the switch position signal is not used as the basis for judging line tripping.

[0040] For example, see Figure 2 When any of the switches 1 and 2 of sub-line 1 or switches 3 and 4 of sub-line 2 are under maintenance or testing, the corresponding switch position signal access control word is set to "0", and the corresponding switch position signal is not used as an auxiliary criterion for line tripping, so as to avoid the switch closing and opening position conversion during maintenance or testing affecting the function of the safety and stability control device.

[0041] In summary, the method provided by this application has the following advantages: 1. Connecting the A, B, and C phase position signals of the sub-circuit switches to the safety and stability control device as auxiliary criteria for sub-circuit tripping effectively prevents misjudgment of line operating status due to abnormalities in related electrical quantities when solely using electrical quantities to determine line operating status. Under normal circumstances, the auxiliary criteria for line tripping are met when any of the six phases of the two circuit breakers changes from the closed position to the open position. This condition is effective and not stringent, and meets the characteristics of a line tripping fault.

[0042] 2. Each sub-circuit switch has a separate position signal access control word, allowing for flexible switching. When the position signal access control word for a sub-circuit switch is set to "1," the position signal of that sub-circuit switch serves as an auxiliary criterion for line tripping. When the position signal access control word is set to "0," the position signal of that sub-circuit switch does not serve as an auxiliary criterion for line tripping. This prevents the circuit breaker's position switching during maintenance or testing from affecting the safety and stability control device.

[0043] 3. Set a condition to prevent false positives in active power changes for line N-2 faults. Compare the increment of the sum of the active power of the non-faulty lines with 25% of the sum of the active power of the faulty line. This condition is effective and not stringent, and meets the characteristics of the line N-2 fault. Furthermore, 25% is a configurable value that can be adjusted based on actual conditions, ensuring flexibility.

[0044] 4. Set the line N-2 fault tripping prevention condition to refuse to execute invalid or illegal tripping due to software calculation errors, program bugs, etc. of the safety and stability control device, further improving the reliability of the safety and stability control device.

[0045] The following describes an embodiment of the device of the present application, which can be used to implement a method for preventing misjudgment of a power plant safety and stability control device line N-2 fault described in the above embodiment of the present application. For details not disclosed in the embodiment of the device of the present application, please refer to the embodiment of the method described above.

[0046] Reference Figure 3 As shown, according to one embodiment of the present application, a power plant safety and stability control device line N-2 fault prevention misjudgment device 300 includes: The first judgment unit 301 is used to judge whether the sub-circuit meets the tripping action condition based on the switch position signal on the sub-circuit and the A, B, and C three-phase position signals of each switch; The second judgment unit 302 is configured to set a fault active power sudden change value error prevention condition according to the active power of the sub-line, and to judge whether the line N-2 satisfies the fault active power sudden change value error prevention condition; The third judgment unit 303 is configured to set a fault tripping error prevention condition based on the tripping amount of line N-2, and to judge whether line N-2 satisfies the fault tripping error prevention condition; The fourth judgment unit 304 is configured to judge that a fault occurs in line N-2 when each sub-line meets the tripping action condition, line N-2 meets the fault active power sudden change value error prevention condition, and line N-2 meets the fault tripping amount error prevention condition.

[0047] like Figure 4 As shown, an embodiment of the present application also provides an electronic device 400, including a memory 410, a processor 420, and a computer program 411 stored on the memory 410 and executable on the processor. When the processor 420 executes the computer program 411, the steps of the above-mentioned method for preventing misjudgment of the line N-2 fault of a power plant safety and stability control device are implemented.

[0048] Since the electronic device introduced in this embodiment is the device used to implement a power plant safety and stability control device line N-2 fault prevention and misjudgment device in the embodiment of this application, based on the method introduced in the embodiment of this application, technical personnel in this field can understand the specific implementation method of the electronic device of this embodiment and its various variations. Therefore, how the electronic device implements the method in the embodiment of this application will not be introduced in detail here. As long as the equipment used by technical personnel in this field to implement the method in the embodiment of this application falls within the scope of protection of this application.

[0049] During the specific implementation process, when the computer program 411 is executed by the processor, any implementation method in the embodiments corresponding to the first aspect can be implemented.

[0050] Figure 5 A schematic diagram of the structure of a computer system suitable for implementing an electronic device according to an embodiment of the present application is shown.

[0051] It should be noted that Figure 5 The computer system 500 of the electronic device shown is only an example and should not bring any limitation to the functions and scope of use of the embodiments of the present application.

[0052] like Figure 5As shown, computer system 500 includes a central processing unit (CPU) 501, which can perform various appropriate actions and processes, such as the methods described in the above embodiments, based on programs stored in read-only memory (ROM) 502 or programs loaded from storage 508 into random access memory (RAM) 503. RAM 503 also stores various programs and data required for system operation. CPU 501, ROM 502, and RAM 503 are interconnected via bus 504. An input / output (I / O) interface 505 is also connected to bus 504.

[0053] The following components are connected to the I / O interface 505: an input section 506 including a keyboard, mouse, and the like; an output section 507 including devices such as a cathode ray tube (CRT), a liquid crystal display (LCD), and speakers; a storage section 508 including devices such as a hard disk; and a communication section 509 including a network interface card such as a LAN (Local Area Network) card or a modem. The communication section 509 performs communication processing via a network such as the Internet. A drive 510 is also connected to the I / O interface 505 as needed. Removable media 511, such as a magnetic disk, an optical disk, a magneto-optical disk, or a semiconductor memory, is installed in the drive 510 as needed, so that computer programs read from the media can be installed in the storage section 508 as needed.

[0054] In particular, according to embodiments of the present application, the processes described above with reference to the flowcharts can be implemented as computer software programs. For example, embodiments of the present application include a computer program product comprising a computer program carried on a computer-readable medium, the computer program containing program code for executing the methods illustrated in the flowcharts. In such embodiments, the computer program can be downloaded and installed from a network via the communication section 509 and / or installed from removable media 511. When executed by the central processing unit (CPU) 501, the computer program performs the various functions defined in the system of the present application.

[0055] It should be noted that the computer-readable medium described in the embodiments of this application may be a computer-readable signal medium or a computer-readable storage medium, or any combination thereof. A computer-readable storage medium may be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination thereof. More specific examples of computer-readable storage media may include, but are not limited to, an electrical connection having one or more conductors, a portable computer disk, a hard disk, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM), flash memory, optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination thereof. In this application, a computer-readable storage medium may be any tangible medium containing or storing a program that can be used by or in conjunction with an instruction execution system, apparatus, or device. In this application, a computer-readable signal medium may include a data signal transmitted in baseband or as part of a carrier wave, which carries computer-readable program code. Such propagated data signals may take various forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination thereof. A computer-readable signal medium may also be any computer-readable medium other than a computer-readable storage medium that can transmit, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device. Program code embodied on a computer-readable medium may be transmitted using any suitable medium, including but not limited to wireless, wired, or any suitable combination thereof.

[0056] The flowcharts and block diagrams in the accompanying drawings illustrate the possible implementation architecture, functions and operations of the systems, methods and computer program products according to various embodiments of the present application. Among them, each box in the flowchart or block diagram can represent a module, program segment, or part of the code, and the above-mentioned module, program segment, or part of the code contains one or more executable instructions for implementing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the box can also occur in an order different from that marked in the accompanying drawings. For example, two boxes represented in succession can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram or flowchart, and the combination of boxes in the block diagram or flowchart, can be implemented with a dedicated hardware-based system that performs the specified function or operation, or can be implemented with a combination of dedicated hardware and computer instructions.

[0057] The units involved in the embodiments described in this application may be implemented by software or hardware, and the units described may also be set in a processor. In some cases, the names of these units do not constitute limitations on the units themselves.

[0058] As another aspect, the present application further provides a computer program product or computer program, comprising computer instructions stored in a computer-readable storage medium. A processor of a computer device reads the computer instructions from the computer-readable storage medium and executes the computer instructions, causing the computer device to perform the method for preventing misjudgment of a power plant safety and stability control device line N-2 fault as described in the above-described embodiment.

[0059] As another aspect, the present application also provides a computer-readable medium, which may be included in the electronic device described in the above embodiments, or may exist independently and not incorporated into the electronic device. The computer-readable medium carries one or more programs, which, when executed by the electronic device, enable the electronic device to implement the method for preventing misjudgment of a power plant safety and stability control device line N-2 fault as described in the above embodiments.

[0060] It should be noted that, although several modules or units of the device for action execution are mentioned in the above detailed description, this division is not mandatory. In fact, according to the embodiment of the application, the features and functions of two or more modules or units described above can be concretized in one module or unit. On the contrary, the features and functions of one module or unit described above can be further divided into multiple modules or units to be concretized.

[0061] Through the description of the above embodiments, it is easy for those skilled in the art to understand that the example embodiments described herein can be implemented by software or by combining software with necessary hardware. Therefore, the technical solution according to the embodiments of the present application can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (which can be a CD-ROM, a USB flash drive, a mobile hard disk, etc.) or on a network, and includes a number of instructions to enable a computing device (which can be a personal computer, a server, a touch terminal, or a network device, etc.) to execute the method according to the embodiments of the present application.

[0062] Those skilled in the art will readily appreciate other embodiments of the present application after considering the specification and practicing the embodiments disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present application that follow the general principles of the present application and include common knowledge or customary techniques in the art that are not disclosed in this application. It should be understood that this application is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from the scope thereof. The scope of this application is limited only by the appended claims.

Claims

1. A method for preventing misjudgment of faults in line N-2 of a power plant safety and stability control device, wherein: The line N-2 includes at least three sub-lines, each of which is provided with a first switch and a second switch, each of which is provided with three phases A, B, and C, and the A, B, and C phase position signals of each switch are connected to a safety and stability control device, and is characterized by including: Determine whether the sub-circuit meets the tripping conditions based on the switch position signal on the sub-circuit and the A, B, and C three-phase position signals of each switch; Set the fault active power sudden change value error prevention condition according to the active power of the sub-line, and determine whether line N-2 meets the fault active power sudden change value error prevention condition; Set the fault tripping quantity error prevention condition based on the tripping quantity of line N-2, and determine whether line N-2 meets the fault tripping quantity error prevention condition; When each sub-line meets the tripping action conditions, and line N-2 meets the fault active power sudden change value prevention conditions and line N-2 meets the fault tripping amount prevention conditions, it is determined that line N-2 has a fault.

2. The method according to claim 1, characterized in that The determining whether the sub-circuit meets the tripping action condition based on the switch position signal on the sub-circuit and the A, B, and C three-phase position signals of each switch includes: When the first switch position signal access control word on any sub-line is set to "1" and the second switch position signal access control word is set to "1", and any phase of the position signal of the three phases A, B, and C of the first switch or the position signal of the three phases A, B, and C of the second switch changes from closed to open, the sub-line is judged to meet the tripping action conditions.

3. The method according to claim 1, characterized in that The step of setting a fault active power mutation value error prevention condition according to the active power of the sub-line and judging whether the line N-2 satisfies the fault active power mutation value error prevention condition includes: When the line N-2 includes four sub-lines, the judgment formula for preventing the error condition of the fault active power sudden change value is set according to the real-time active power of the four sub-lines: ； in, Indicates the real-time active power of sub-line three, Indicates the real-time active power of sub-line 4, Indicates the active power of sub-line 3 200ms before sub-line 1 and sub-line 2 trip due to fault. Indicates the active power of sub-line 4 200ms before sub-line 1 and sub-line 2 trip due to fault. Indicates the active power of sub-line 1 200ms before sub-line 1 and sub-line 2 trip due to fault. Indicates the active power of sub-circuit 2 200ms before the fault trip of sub-circuit 1 and sub-circuit 2. x is the set threshold value, ranging from 0 to 100. When the active powers of the four sub-lines in line N-2 satisfy the judgment formula, it is determined that line N-2 meets the fault active power sudden change value error prevention condition.

4. The method according to claim 1, wherein The step of setting a fault tripping amount error prevention condition based on the tripping amount of line N-2 and determining whether line N-2 satisfies the fault tripping amount error prevention condition includes: The judgment formula for setting the fault tripping amount error prevention condition based on the tripping amount of line N-2 is as follows: ； in, Indicates the amount of generator disconnection after line N-2 fault, which is automatically calculated by the safety and stability control device according to the preset strategy. Indicates the anti-error setting value of the safety and stability control device for the tripping amount, which is set above the total active power of the power plant; When the tripping amount after the fault of line N-2 satisfies the judgment formula, it is determined that line N-2 meets the fault tripping amount anti-error condition.

5. The method according to any one of claims 1 to 4, characterized in that The method further comprises: When the first switch or second switch on any sub-line is under maintenance or testing, the switch position signal access control word is set to "0", and the switch position signal is not used as the basis for judging line tripping.

6. A device for preventing misjudgment of faults in line N-2 of a power plant safety and stability control device, applied to the method according to any one of claims 1 to 5, characterized in that: include: A first judgment unit is used to judge whether the sub-circuit meets the tripping action condition based on the switch position signal on the sub-circuit and the A, B, and C three-phase position signals of each switch; The second judgment unit is used to set a fault active power sudden change value error prevention condition according to the active power of the sub-line, and judge whether the line N-2 meets the fault active power sudden change value error prevention condition; a third judgment unit, configured to set a fault tripping amount error prevention condition according to the tripping amount of line N-2, and to judge whether line N-2 satisfies the fault tripping amount error prevention condition; The fourth judgment unit is used to judge that line N-2 has a fault when each sub-line meets the tripping action condition, line N-2 meets the fault active power sudden change value prevention condition, and line N-2 meets the fault tripping amount prevention condition.

7. A computer-readable storage medium, characterized in that The storage medium stores computer instructions, which, when executed on a computer, enable the computer to execute the method according to any one of claims 1 to 5.

8. An electronic device, characterized in that: include: memory and processor; The memory is used to store computer instructions; The processor is configured to call the computer instructions stored in the memory so that the electronic device executes the method according to any one of claims 1 to 5.

Images