A distribution network protection method, device and storage medium

Abstract

The present invention discloses a distribution network protection method, device and storage medium, the method comprising: determining a protection criterion and a confidence interval of the protection criterion, wherein the number of protection criteria is an integer greater than or equal to 2; constructing a criterion action situation analysis model according to the confidence interval of the protection criterion; and protecting the distribution network according to the criterion action situation analysis model. Through the technical solution of the present invention, a distribution network protection method integrating multiple criteria can be constructed, and the distribution network protection can be carried out comprehensively, accurately and efficiently.

Description

Technical Field

[0001] Embodiments of the present invention relate to the technical field of power distribution networks, and in particular to a power distribution network protection method, device, and storage medium. Background Art

[0002] With the development of distributed power sources and a high proportion of renewable energy, the energy flow of distribution networks has changed from the traditional one-way flow to two-way flow. While improving the performance of distribution networks, the network topology has also become more complex. Therefore, the protection method of distribution networks is an important research topic at present.

[0003] The existing distribution network protection method mainly uses three-stage current protection as the criterion, and adopts a single criterion to make protection decisions for faults. In some upgraded nodes, directional current protection, distance protection or differential protection is used to implement distribution network protection decisions, and different criteria are implemented in a primary-backup manner. However, each protection criterion operates independently and generates fault judgments independently, which reduces the reliability of the distribution network protection system. Summary of the invention

[0004] The present invention provides a distribution network protection method, device and storage medium, and constructs a distribution network protection method integrating multiple criteria for comprehensive, accurate and efficient distribution network protection.

[0005] In a first aspect, an embodiment of the present invention provides a distribution network protection method, the method comprising:

[0006] Determining protection criteria and confidence intervals of the protection criteria, wherein the number of protection criteria is an integer greater than or equal to 2;

[0007] According to the confidence interval of the protection criterion, a criterion action situation analysis model is constructed;

[0008] The distribution network is protected according to the criterion action situation analysis model.

[0009] Optionally, the protection criterion includes at least two of a distance protection criterion, a directional protection criterion, an overcurrent protection and a differential protection criterion.

[0010] Optionally, if the protection criteria include a distance protection criterion, the confidence interval of the distance protection criterion in, Z calc is the calculated impedance calculated using the voltage and current measurements of the line, Z set It is the action impedance setting value of distance protection criterion.

[0011] Optionally, if the protection criteria include a directional protection criterion, the confidence interval of the directional protection criterion Among them, the voltage measurement value of the bus is measured and current measurement The angle between arg(·) represents the angle between the calculated vectors, and the power factor of the distribution network line is between 0 and θ.

[0012] Optional, if the protection criteria include overcurrent protection and differential protection criteria, the confidence intervals of the overcurrent protection and differential protection criteria Among them, the fault condition reflected by the overcurrent or unbalanced current K and p are constants, and the rated current I is the line current at the measurement location, I pickup It is the starting current setting value of the measurement location.

[0013] Optionally, if the number of protection criteria is 2, the criterion action analysis model is Where S1 is the decision signal of protection criterion 1, S2 is the decision signal of protection criterion 2, x is the number of confidence intervals of protection criterion 1, P 1i represents the confidence interval of the i-th protection criterion 1, y is the number of confidence intervals of the protection criterion 2, P 2j represents the confidence interval of the j-th protection criterion 2, i = 1, 2, …, x, j = 1, 2, …, y.

[0014] Optionally, if the number of protection criteria is 3, the criterion action analysis model is Where S1 is the decision signal of protection criterion 1, S2 is the decision signal of protection criterion 2, S3 is the decision signal of protection criterion 3, x is the number of confidence intervals of protection criterion 1, P 1i represents the confidence interval of the i-th protection criterion 1, y is the number of confidence intervals of the protection criterion 2, P 2j represents the confidence interval of the jth protection criterion 2, z is the number of confidence intervals of the protection criterion 3, P 3k represents the confidence interval of the kth protection criterion 3, i = 1, 2, ..., x, j = 1, 2, ..., y, k = 1, 2, ..., z.

[0015] In a second aspect, an embodiment of the present invention further provides a distribution network protection device, which includes: a determination module, a processing module and a protection module; the determination module is used to determine the protection criterion and the confidence interval of the protection criterion, wherein the number of protection criteria is an integer greater than or equal to 2; the processing module is used to construct a criterion action situation analysis model according to the confidence interval of the protection criterion; the protection module is used to protect the distribution network according to the criterion action situation analysis model.

[0016] In a third aspect, an embodiment of the present invention further provides a distribution network protection device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor is used to implement a distribution network protection method as described in any one of the embodiments of the present invention when executing the computer program.

[0017] In a fourth aspect, an embodiment of the present invention further provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements a distribution network protection method as described in any one of the embodiments of the present invention.

[0018] The present invention determines the protection criterion and the confidence interval of the protection criterion, wherein the number of the protection criterion is an integer greater than or equal to 2; constructs a criterion action situation analysis model according to the confidence interval of the protection criterion; and protects the distribution network according to the criterion action situation analysis model. The problem of low performance of the distribution network protection system caused by the independent operation and independent fault judgment of each protection criterion in the prior art is solved, and a distribution network protection method integrating multiple criteria can be constructed to comprehensively, accurately and efficiently protect the distribution network. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a flow chart of a distribution network protection method in Embodiment 1 of the present invention;

[0020] Figure 2 It is a schematic diagram of the architecture of a distribution network protection method in Embodiment 1 of the present invention;

[0021] Figure 3 is a flow chart of another distribution network protection method in Embodiment 1 of the present invention;

[0022] Figure 4 It is a structural schematic diagram of a distribution network protection device in Embodiment 2 of the present invention;

[0023] Figure 5 It is a structural schematic diagram of a distribution network protection device in embodiment 3 of the present invention. DETAILED DESCRIPTION

[0024] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0025] Embodiment 1

[0026] Figure 1A flow chart of a distribution network protection method provided in Embodiment 1 of the present invention is provided. This embodiment is applicable to the situation of fault location and protection isolation of distribution network. The method can be executed by the distribution network protection device in the embodiment of the present invention. The device can be implemented in software and / or hardware. Figure 1 As shown, the method specifically comprises the following steps:

[0027] S101. Determine protection criteria and confidence intervals of the protection criteria, wherein the number of protection criteria is an integer greater than or equal to 2.

[0028] The confidence interval is an estimated range of error of the population average value, and specifically, the interval includes the credibility of the result of the population average value. Specifically, the protection criterion includes at least two of the distance protection criterion, the direction protection criterion, the overcurrent protection and the differential protection criterion; the confidence interval of the protection criterion is the calculated interval of the protection criterion failure.

[0029] S102: construct a criterion action situation analysis model based on the confidence interval of the protection criterion.

[0030] Among them, each protection criterion has its corresponding confidence interval, and the confidence intervals of each protection criterion are different. The confidence interval of the protection criterion can be calculated using the setting value of the criterion; by combining the confidence intervals of different protection criteria, a comprehensive judgment of the protection criterion can be made, and a criterion action situation analysis model can be constructed.

[0031] Specifically, the protection criteria include distance protection criteria, directional protection criteria, overcurrent protection and differential protection criteria, wherein the calculation methods of the overcurrent protection and differential protection criteria are the same.

[0032] Optionally, when the protection criterion is a distance protection criterion, the confidence interval is calculated as shown in formula (1):

[0033]

[0034] in, Z calc is the calculated impedance calculated using the voltage and current measurements of the line, Z set It is the action impedance setting value of distance protection criterion.

[0035] Specifically, when the calculated impedance is outside the action area of ​​the distance protection, the confidence interval P of the protection criterion is 0. As the calculated impedance enters the setting range, the confidence interval becomes non-zero. According to the deviation ratio between the calculated impedance and the setting impedance value, the confidence interval is 0.5 to 1.

[0036] Optionally, when the protection criterion is a directional protection criterion, the confidence interval is calculated as shown in formula (2):

[0037]

[0038] Among them, the voltage measurement value of the bus is measured and current measurement The angle between arg(·) represents the angle between the calculated vectors, and the power factor of the distribution network line is between 0 and θ.

[0039] Specifically, under normal circumstances, the power factor of the distribution network line is between 0 and θ; in the case of overload, the power factor of the distribution network line can be as high as Power factor close to The confidence interval of the directional protection criterion can be calculated by formula (2); when the phase angle is greater than When the angle is , the confidence interval P becomes non-zero. When the distribution network has no fault, the confidence interval P is 0. When , the confidence interval is 0.5, and the confidence interval changes as the angle increases.

[0040] Optionally, when the protection criterion is overcurrent protection and differential protection criterion, the confidence interval is calculated as shown in formula (3):

[0041]

[0042] Among them, the fault condition reflected by the overcurrent or unbalanced current K and p are constants, and the rated current I is the line current at the measurement location, I pickup It is the starting current setting value of the measurement location.

[0043] Specifically, if the line current I obtained from the measurement position is less than the starting current, the confidence interval P is 0. If the current is greater than the starting value, the confidence interval is non-zero and increases with the increase of the overcurrent condition and the unbalanced current condition.

[0044] Optionally, after obtaining the confidence interval of each protection criterion, the confidence interval of each protection criterion may be processed to construct a criterion action situation analysis model.

[0045] The protection criteria include at least two. Specifically, the protection criteria may be two, three, four, etc., which is not limited in the embodiment of the present invention.

[0046] Optionally, if the number of protection criteria is 2, the construction method of the criterion action situation analysis model is as shown in formula (4):

[0047]

[0048] Where S1 is the decision signal of protection criterion 1, S2 is the decision signal of protection criterion 2, x is the number of confidence intervals of protection criterion 1, P 1i represents the confidence interval of the i-th protection criterion 1, y is the number of confidence intervals of the protection criterion 2, P 2j represents the confidence interval of the j-th protection criterion 2, i = 1, 2, …, x, j = 1, 2, …, y.

[0049] Wherein, protection criterion 1 can be any one of distance protection criterion, directional protection criterion, overcurrent protection and differential protection criterion, and protection criterion 2 can be any one of distance protection criterion, directional protection criterion, overcurrent protection and differential protection criterion except protection criterion 1. Specifically, Figure 2 is a schematic diagram of the architecture of a distribution network protection method in the first embodiment of the present invention, from Figure 2 It can be seen that the architecture of the distribution network protection method contains many protection criterion units, wherein each criterion unit contains multiple protection criteria, and the data judgment results of each protection criterion can be used interactively. The number of confidence intervals of protection criterion 1 is the number of protection criterion 1 contained in the distribution network, the number of confidence intervals of protection criterion 2 is the number of protection criterion 2 contained in the distribution network, and so on.

[0050] Optionally, the action results of the criteria may be subjected to multi-criteria fusion verification to eliminate erroneous criteria and identify correct criteria.

[0051] Specifically, S is a decision signal from a specific criterion, and the subscripts represent different types of criteria, such as distance protection criteria, directional protection criteria, overcurrent protection criteria, and differential protection criteria. The allocation of S values ​​depends on the independent judgment results of the criterion itself. For example, S=1 indicates that the criterion is in action, and S=0 indicates that the criterion is not in action.

[0052] Specifically, when the S value is 1, and the confidence intervals P1, P2, and P3 are 0, the second term of the expression is -1, the first term of the expression is 1, and the criterion action analysis model F is a negative value. At this time, it can be determined that the criterion is erroneous; when the S value is 0, the confidence interval is between 0.5 and 1, the second term of the expression is a positive number, and the first term of the expression is a negative number, and the criterion action analysis model F is a negative value. At this time, it can be determined that the criterion refuses to act; when the S value is 1, the confidence intervals P1, P2, and P3 are non-0, the criterion action analysis model F is a positive value, and at this time, it can be determined that the criterion is correctly acted. The action results of the criterion can be verified by multi-criteria fusion, excluding the criteria of refusal and erroneous action, retaining the correct criteria, and improving the accuracy of the system's fault judgment.

[0053] Optionally, if the number of protection criteria is 3, the construction method of the criterion action situation analysis model is as shown in formula (5):

[0054]

[0055] Where S1 is the decision signal of protection criterion 1, S2 is the decision signal of protection criterion 2, S3 is the decision signal of protection criterion 3, x is the number of confidence intervals of protection criterion 1, P 1i represents the confidence interval of the i-th protection criterion 1, y is the number of confidence intervals of the protection criterion 2, P 2j represents the confidence interval of the jth protection criterion 2, z is the number of confidence intervals of the protection criterion 3, P 3k represents the confidence interval of the kth protection criterion 3, i = 1, 2, ..., x, j = 1, 2, ..., y, k = 1, 2, ..., z.

[0056] Specifically, protection criterion 1 may be any one of distance protection criterion, directional protection criterion, overcurrent protection and differential protection criterion, protection criterion 2 may be any one of distance protection criterion, directional protection criterion, overcurrent protection and differential protection criterion except protection criterion 1, and protection criterion 3 may be any one of distance protection criterion, directional protection criterion, overcurrent protection and differential protection criterion except protection criterion 1 and protection criterion 2. The number of confidence intervals of protection criterion 1 is the number of protection criterion 1 included in the distribution network, the number of confidence intervals of protection criterion 2 is the number of protection criterion 2 included in the distribution network, and the number of confidence intervals of protection criterion 3 is the number of protection criterion 3 included in the distribution network.

[0057] S103, analyzing the model according to the criterion action situation, and protecting the distribution network.

[0058] The protection of the distribution network is achieved by verifying the judgment results, eliminating the judgment criteria for refusal to operate and false operation, and forming a tripping plan to isolate the fault.

[0059] Specifically, Figure 3 is a flow chart of another distribution network protection method in the first embodiment of the present invention, from Figure 3 It can be seen that the method specifically includes the following steps:

[0060] S301, data collection and analysis.

[0061] Specifically, data collection and analysis mainly completes the information collection and analysis of electrical analog quantities and switch quantities.

[0062] S302: Setting the protection criterion confidence interval.

[0063] Specifically, the protection criterion confidence interval setting is mainly to upload the analyzed electrical analog quantity and switch quantity information after multiple criteria processing for protection criterion evaluation, and the protection criterion with complete sampling input conditions is activated; the multi-criteria protection evaluation unit gives the fault confidence interval for different protection criteria, and makes a comprehensive fault decision, and finally uploads the processed fault judgment result information to the fault location unit; after receiving the data information, the fault location unit feeds back the decision information to the primary system through the communication system for protection action

[0064] S303: Fault judgment based on fusion of multiple criteria.

[0065] Specifically, the fault judgment based on multi-criteria fusion is to give the confidence interval of the fault according to different protection criteria and make a comprehensive fault judgment.

[0066] S304, fault location and tripping.

[0067] Specifically, fault location and tripping is to locate the fault location based on fault judgment and isolate the fault to achieve the purpose of distribution network protection.

[0068] In the embodiment of the present invention, a protection method integrating multiple criteria can be designed according to the differences in sampling conditions, the fault judgment advantages of various criteria can be brought into play, the application defects of various criteria can be compensated, and the effects of distribution network protection and fault identification can be maximized.

[0069] The embodiment of the present invention provides a distribution network protection method, the method comprising: determining a protection criterion and a confidence interval of the protection criterion, wherein the number of protection criteria is an integer greater than or equal to 2; constructing a criterion action situation analysis model according to the confidence interval of the protection criterion; and protecting the distribution network according to the criterion action situation analysis model. The problem of low performance of the distribution network protection system caused by the independent operation and independent generation of fault judgment between the protection criteria in the prior art is solved, and a distribution network protection method integrating multiple criteria can be constructed to comprehensively, accurately and efficiently protect the distribution network.

[0070] Embodiment 2

[0071] The distribution network protection device provided in the second embodiment of the present invention can execute the distribution network protection method provided in any of the above embodiments of the present invention, and has the corresponding functional modules and beneficial effects of the execution method.

[0072] Figure 4 A schematic diagram of the structure of a distribution network protection device provided in Example 2 is shown in FIG. Figure 4 As shown, it includes: a determination module 401, a processing module 402 and a protection module 403.

[0073] The determination module 401 is used to determine the protection criteria and the confidence interval of the protection criteria, wherein the number of the protection criteria is an integer greater than or equal to 2.

[0074] The processing module 402 is used to construct a criterion action situation analysis model according to the confidence interval of the protection criterion.

[0075] The protection module 403 is used to analyze the model according to the criterion action situation and protect the distribution network.

[0076] The distribution network protection device provided in this embodiment is for implementing the distribution network protection method in the above embodiments. The implementation principle and technical effect of the distribution network protection device provided in this embodiment are similar to those in the above embodiments, and will not be repeated here.

[0077] Optionally, the protection criterion includes at least two of a distance protection criterion, a directional protection criterion, an overcurrent protection and a differential protection criterion.

[0078] Optionally, if the protection criteria include a distance protection criterion, the confidence interval of the distance protection criterion in, Z calc is the calculated impedance calculated using the voltage and current measurements of the line, Z set It is the action impedance setting value of distance protection criterion.

[0079] Optionally, if the protection criteria include a directional protection criterion, the confidence interval of the directional protection criterion Among them, the voltage measurement value of the bus is measured and current measurement The angle between arg(·) represents the angle between the calculated vectors, and the power factor of the distribution network line is between 0 and θ.

[0080] Optional, if the protection criteria include overcurrent protection and differential protection criteria, the confidence intervals of the overcurrent protection and differential protection criteria Among them, the fault condition reflected by the overcurrent or unbalanced current K and p are constants, and the rated current I is the line current at the measurement location, I pickup It is the starting current setting value of the measurement location.

[0081] Optionally, if the number of protection criteria is 2, the criterion action analysis model is Where S1 is the decision signal of protection criterion 1, S2 is the decision signal of protection criterion 2, x is the number of confidence intervals of protection criterion 1, P 1irepresents the confidence interval of the i-th protection criterion 1, y is the number of confidence intervals of the protection criterion 2, P 2j represents the confidence interval of the j-th protection criterion 2, i = 1, 2, …, x, j = 1, 2, …, y.

[0082] Optionally, if the number of protection criteria is 2, the criterion action analysis model is Where S1 is the decision signal of protection criterion 1, S2 is the decision signal of protection criterion 2, x is the number of confidence intervals of protection criterion 1, P 1i represents the confidence interval of the i-th protection criterion 1, y is the number of confidence intervals of the protection criterion 2, P 2j represents the confidence interval of the j-th protection criterion 2, i = 1, 2, …, x, j = 1, 2, …, y.

[0083] Embodiment 3

[0084] Figure 5 This is a schematic diagram of the structure of a distribution network protection device in Embodiment 3 of the present invention. Figure 5 A block diagram of an exemplary power distribution network protection device 12 suitable for implementing embodiments of the present invention is shown. Figure 5 The distribution network protection device 12 shown is only an example and should not bring any limitation to the functions and scope of use of the embodiments of the present invention.

[0085] like Figure 5 As shown, the distribution network protection device 12 is in the form of a general computing device. The components of the distribution network protection device 12 may include but are not limited to: one or more processors or processing units 16, system memory 28, and a bus 18 connecting different system components (including system memory 28 and processing unit 16).

[0086] Bus 18 represents one or more of several types of bus structures, including a memory bus or memory controller, a peripheral bus, an accelerated graphics port, a processor or a local bus using any of a variety of bus architectures. By way of example, these architectures include, but are not limited to, an Industry Standard Architecture (ISA) bus, a Micro Channel Architecture (MAC) bus, an Enhanced ISA bus, a Video Electronics Standards Association (VESA) local bus, and a Peripheral Component Interconnect (PCI) bus.

[0087] The power distribution network protection device 12 typically includes a variety of computer system readable media. These media can be any available media that can be accessed by the power distribution network protection device 12, including volatile and non-volatile media, removable and non-removable media.

[0088] The system memory 28 may include computer system readable media in the form of volatile memory, such as random access memory (RAM) 30 and / or cache memory 32. The power distribution network protection device 12 may further include other removable / non-removable, volatile / non-volatile computer system storage media. By way of example only, the storage system 34 may be used to read and write non-removable, non-volatile magnetic media ( Figure 5 not shown, usually called a "hard drive"). Although Figure 5 Not shown in the figure, a disk drive for reading and writing to a removable non-volatile disk (e.g., a "floppy disk"), and an optical disk drive for reading and writing to a removable non-volatile optical disk (e.g., a CD-ROM, a DVD-ROM, or other optical media) may be provided. In these cases, each drive may be connected to the bus 18 via one or more data medium interfaces. The memory 28 may include at least one program product having a set (e.g., at least one) of program modules that are configured to perform the functions of the various embodiments of the present invention.

[0089] A program / utility 40 having a set (at least one) of program modules 42 may be stored, for example, in the memory 28. Such program modules 42 include, but are not limited to, an operating system, one or more application programs, other program modules, and program data, each of which or some combination may include an implementation of a network environment. The program modules 42 generally perform the functions and / or methods of the embodiments described herein.

[0090] The distribution network protection device 12 may also communicate with one or more external devices 14 (such as a keyboard, a pointing device, a display 24, etc.), and may also communicate with one or more devices that enable a user to interact with the distribution network protection device 12, and / or communicate with any device that enables the distribution network protection device 12 to communicate with one or more other computing devices (such as a network card, a modem, etc.). Such communication may be performed through an input / output (I / O) interface 22. In addition, in the distribution network protection device 12 in this embodiment, the display 24 does not exist as an independent individual, but is embedded in the mirror surface. When the display surface of the display 24 is not displayed, the display surface of the display 24 is visually integrated with the mirror surface. In addition, the distribution network protection device 12 may also communicate with one or more networks (such as a local area network (LAN), a wide area network (WAN) and / or a public network, such as the Internet) through a network adapter 20. As Figure 5 As shown, the network adapter 20 communicates with other modules of the power distribution network protection device 12 via the bus 18. It should be understood that although Figure 5Not shown, other hardware and / or software modules may be used in conjunction with the distribution network protection device 12, including but not limited to: microcode, device drivers, redundant processing units, external disk drive arrays, RAID systems, tape drives, and data backup storage systems.

[0091] The processing unit 16 executes various functional applications and data processing by running the program stored in the system memory 28, for example, implementing the distribution network protection method provided in the embodiment of the present invention, the method comprising:

[0092] Determining protection criteria and confidence intervals of the protection criteria, wherein the number of protection criteria is an integer greater than or equal to 2;

[0093] According to the confidence interval of the protection criterion, a criterion action situation analysis model is constructed;

[0094] The distribution network is protected according to the criterion action situation analysis model.

[0095] Embodiment 4

[0096] Embodiment 4 of the present invention provides a computer-readable storage medium, on which a computer program is stored. When the program is executed by a processor, the distribution network protection method provided by all the embodiments of the present invention is implemented. The method includes:

[0097] Determining protection criteria and confidence intervals of the protection criteria, wherein the number of protection criteria is an integer greater than or equal to 2;

[0098] According to the confidence interval of the protection criterion, a criterion action situation analysis model is constructed;

[0099] The distribution network is protected according to the criterion action situation analysis model.

[0100] Any combination of one or more computer-readable media can be used. Computer-readable media can be computer-readable signal media or computer-readable storage media. Computer-readable storage media can be, for example, but not limited to, electrical, magnetic, optical, electromagnetic, infrared, or semiconductor systems, devices or devices, or any combination of the above. More specific examples (non-exhaustive list) of computer-readable storage media include: electrical connections with one or more wires, portable computer disks, hard disks, random access memories (RAM), read-only memories (ROM), erasable programmable read-only memories (EPROM or flash memory), optical fibers, portable compact disk read-only memories (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination of the above. In this document, computer-readable storage media can be any tangible medium containing or storing a program, which can be used by an instruction execution system, device or device or used in combination with it.

[0101] Computer-readable signal media may include data signals propagated in baseband or as part of a carrier wave, which carry computer-readable program code. Such propagated data signals may take a variety of forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination of the above. Computer-readable signal media may also be any computer-readable medium other than a computer-readable storage medium, which may send, propagate, or transmit a program for use by or in conjunction with an instruction execution system, apparatus, or device.

[0102] The program code embodied on the computer readable medium may be transmitted using any appropriate medium, including but not limited to wireless, wireline, optical fiber cable, RF, etc., or any suitable combination of the foregoing.

[0103] Computer program code for performing the operation of the present invention may be written in one or more programming languages ​​or a combination thereof, including object-oriented programming languages ​​such as Java, Smalltalk, C++, and conventional procedural programming languages ​​such as "C" or similar programming languages. The program code may be executed entirely on the user's computer, partially on the user's computer, as a separate software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through 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).

[0104] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A distribution network protection method, characterized in that: include: Determining protection criteria and confidence intervals of the protection criteria, wherein the number of the protection criteria is an integer greater than or equal to 2; According to the confidence interval of the protection criterion, a criterion action situation analysis model is constructed; Protecting the distribution network according to the criterion action situation analysis model; The protection criterion includes at least two of the distance protection criterion, the direction protection criterion, the overcurrent protection and the differential protection criterion; If the protection criterion includes a distance protection criterion, the confidence interval of the distance protection criterion is in, Z calc is the calculated impedance calculated using the voltage and current measurements of the line, Z set is the action impedance setting value of the distance protection criterion; If the protection criterion includes a directional protection criterion, the confidence interval of the directional protection criterion is Among them, the voltage measurement value of the bus is measured and current measurement The angle between arg(g) represents the angle between the calculated vectors, the power factor of the distribution network line is between 0 and θ, and θ represents the maximum power factor of the distribution network line; If the protection criteria include overcurrent protection and differential protection criteria, the confidence intervals of the overcurrent protection and differential protection criteria are Among them, the fault condition reflected by the overcurrent or unbalanced current K and p are constants, and the rated current I is the line current at the measurement location, I pickup is the starting current setting value of the measuring position; If the number of protection criteria is 2, the criterion action analysis model is: Where S1 is the decision signal of protection criterion 1, S2 is the decision signal of protection criterion 2, x is the number of confidence intervals of protection criterion 1, P 1i represents the confidence interval of the i-th protection criterion 1, y is the number of confidence intervals of protection criterion 2, P 2j represents the confidence interval of the jth protection criterion 2, i = 1, 2, ..., x, j = 1, 2, ..., y; If the number of protection criteria is 3, the criterion action analysis model is: Where S1 is the decision signal of protection criterion 1, S2 is the decision signal of protection criterion 2, S3 is the decision signal of protection criterion 3, x is the number of confidence intervals of protection criterion 1, P 1i represents the confidence interval of the i-th protection criterion 1, y is the number of confidence intervals of protection criterion 2, P 2j represents the confidence interval of the jth protection criterion 2, z is the number of confidence intervals of the protection criterion 3, P 3k represents the confidence interval of the kth protection criterion 3, i = 1, 2, ..., x, j = 1, 2, ..., y, k = 1, 2, ..., z.

2. A distribution network protection device, characterized in that: The distribution network protection device is used to implement the distribution network protection method described in claim 1, and the distribution network protection device includes: a determination module, a processing module and a protection module; The determination module is used to determine the protection criteria and the confidence interval of the protection criteria, wherein the number of the protection criteria is an integer greater than or equal to 2; The processing module is used to construct a criterion action situation analysis model according to the confidence interval of the protection criterion; The protection module is used to protect the distribution network according to the criterion action situation analysis model.

3. A distribution network protection device, characterized in that: include: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor is configured to implement the distribution network protection method as claimed in claim 1 when executing the computer program.

4. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the power distribution network protection method as claimed in claim 1 is implemented.

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