A matching method and related devices based on multiple setting schemes for distribution networks

Abstract

This application discloses a matching method and related apparatus for multiple setting schemes in a distribution network, comprising: determining the setting principle form of a rule base; classifying the setting principles and inputting setting data to generate an expert rule base; configuring setting schemes according to the requirements of the relay protection site based on the expert rule base, resulting in multiple setting schemes containing major and minor principles; when the distribution network line switching equipment needs to perform single calculations, setting corresponding major and minor principles according to the actual needs of the line based on the multiple setting schemes, thereby generating a setting scheme for the line relay protection equipment. This application not only enables the selection of different setting schemes for different types of distribution network lines, improving the efficiency of the distribution network in preventing and handling faults, but also ensuring the operational stability of relay protection equipment.

Description

Technical Field

[0001] This application relates to the field of relay protection device setting technology, and in particular to a matching method and related device based on multiple setting schemes in a distribution network. Background Technology

[0002] With the current development of power distribution networks, the continuous expansion of power supply scale has led to increasingly complex line laying. In the current power system, three-stage protection is the most commonly used and widely adopted form, and the coordination between the protection stages is closely related to voltage-time type (i.e., switching logic). Therefore, to ensure the timely, effective, and correct operation of relay protection devices during power system operation and prevent incorrect actions such as failure to operate or maloperation, one or more sets of setting principles are needed to meet the needs of the large-scale lines in the current power distribution network. By setting correct and complete setting values ​​for relay protection devices, fault actions can be promptly disconnected or isolated when power faults occur, preventing the chain reaction of faults from further expanding the impact range.

[0003] Current distribution networks have numerous segmented lines and a large number of load switches. To achieve accurate fault isolation and reduce fault location time, the local feeder automation configuration scheme for distribution networks adopts a combination of voltage-type and current-type functions. Therefore, in the case of large-scale distribution networks, multiple scheme principles may arise, such as "calculate the main line switches first, then the branch line switches" or "calculate sequentially." However, the current distribution network system does not meet these requirements. Therefore, it is necessary to provide an operational method for setting calculation schemes that can be selected by the setting calculation personnel to meet the requirements and ensure that the relay protection devices meet the four requirements of selectivity, speed, sensitivity, and reliability under the grid rules for stable operation of the power system. Summary of the Invention

[0004] This application provides a matching method and related device based on multiple setting schemes for distribution networks, which provides an operating mode for a set of setting calculation schemes that can be selected by setting calculation personnel to meet the requirements and ensure that the relay protection device meets the stable operation of the power system.

[0005] In view of this, the first aspect of this application provides a matching method based on multiple setting schemes for a distribution network, the method comprising:

[0006] The rules base is defined by determining the format of the tuning principles, classifying the tuning principles and entering the tuning data, thereby generating an expert rule base.

[0007] Based on the expert rule base, setting schemes are configured according to the requirements of the relay protection site, resulting in multiple setting schemes containing major and minor principles.

[0008] When the switching equipment of the distribution network line needs to be calculated, the corresponding major and minor principles are set according to the actual needs of the line based on multiple sets of the aforementioned setting schemes, thereby generating the setting scheme of the line relay protection equipment.

[0009] Optionally, the process of determining the form of the tuning principles in the rule base, classifying the tuning principles and entering tuning data to generate an expert rule base, specifically includes:

[0010] Determine the form of the tuning principles in the rule base, classify the tuning principles into rule category I, and then perform derivative classification on each rule category I to obtain derivative rules i that include devices or switches; input the tuning data of each derivative rule i to generate the expert rule base.

[0011] Each of the rule categories I specifically includes:

[0012] Rules for reactors, rules for external lines, rules for station service transformers, rules for tortuous transformers, rules for capacitors, and rules for internal lines.

[0013] Optionally, the step of configuring setting schemes based on the expert rule base according to the requirements of the relay protection site results in multiple setting schemes containing major and minor principles, specifically including:

[0014] Based on the expert rule base, setting schemes are configured according to the requirements of the relay protection site, resulting in multiple setting schemes, specifically including:

[0015] Setting scheme i: The general principle is to set all main lines to current type, and the specific principle is to set them to voltage type when there are automated devices at the branch line.

[0016] Setting scheme i+1: The general principle is to set all equipment on the main line to current type, and the minor principle is to set the equipment on the branch line to voltage type when it is an automated device.

[0017] Setting scheme i+2: The general principle is to set all switches on the main line to current type, and the specific principle is to set the first automatic switch on the branch line to current type, the intermediate switches to voltage type, and the final switch to current type.

[0018] A second aspect of this application provides a matching system based on multiple setting schemes for a distribution network, the system comprising:

[0019] The generation unit is used to determine the form of the tuning principles of the rule base, classify the tuning principles and enter the tuning data, thereby generating the expert rule base;

[0020] The configuration unit is used to configure the setting scheme based on the expert rule base according to the requirements of the relay protection site, and obtain multiple setting schemes containing major principles and minor principles.

[0021] The setting unit is used to generate a setting scheme for the line relay protection equipment when the distribution network line switching equipment needs to be calculated. Based on multiple setting schemes, it sets the corresponding major and minor principles according to the actual needs of the line.

[0022] Optionally, the generation unit is specifically used for

[0023] Determine the form of the tuning principles in the rule base, classify the tuning principles into rule category I, and then perform derivative classification on each rule category I to obtain derivative rules i that include devices or switches; input the tuning data of each derivative rule i to generate the expert rule base.

[0024] Each of the rule categories I specifically includes:

[0025] Rules for reactors, rules for external lines, rules for station service transformers, rules for tortuous transformers, rules for capacitors, and rules for internal lines.

[0026] Optionally, the configuration unit is specifically used for:

[0027] Based on the expert rule base, setting schemes are configured according to the requirements of the relay protection site, resulting in multiple setting schemes, specifically including:

[0028] Setting scheme i: The general principle is to set all main lines to current type, and the specific principle is to set them to voltage type when there are automated devices at the branch line.

[0029] Setting scheme i+1: The general principle is to set all equipment on the main line to current type, and the minor principle is to set the equipment on the branch line to voltage type when it is an automated device.

[0030] Setting scheme i+2: The general principle is to set all switches on the main line to current type, and the specific principle is to set the first automatic switch on the branch line to current type, the intermediate switches to voltage type, and the final switch to current type.

[0031] A third aspect of this application provides a matching device based on multiple setting schemes in a distribution network, the device comprising a processor and a memory:

[0032] The memory is used to store program code and transmit the program code to the processor;

[0033] The processor is configured to execute the steps of the matching method based on multiple setting schemes of the distribution network as described in the first aspect above, according to the instructions in the program code.

[0034] The fourth aspect of this application provides a computer-readable storage medium for storing program code for executing the matching method based on multiple setting schemes of a distribution network as described in the first aspect above.

[0035] As can be seen from the above technical solutions, this application has the following advantages:

[0036] This application provides a matching method based on multiple setting schemes for distribution networks. Under the large-scale deployment of distribution network lines, it not only enables the selection of different setting schemes for different types of distribution network lines, but also fulfills the need for intelligent matching of setting values ​​based on setting principles. When the setting principles require consideration of the calculations of distribution network equipment at different levels, the system automatically acquires the data needed for setting value calculation and performs the calculations. This not only improves the efficiency of distribution networks in preventing and handling faults, but also ensures the operational stability of relay protection equipment. Furthermore, it ensures that the relay protection devices meet the four requirements of selectivity, speed, sensitivity, and reliability under the grid rules for stable operation of the power system.

[0037] Furthermore, this invention is easy to operate, facilitates calculation and verification by setting personnel within the system, has universal applicability, and can adapt to various situations by conducting open editing of setting schemes in different types of distribution network line laying, thus possessing diverse applicability. Therefore, after the technology is commercialized, it can be promoted and applied throughout the national power system, and has great market promotion value. Attached Figure Description

[0038] Figure 1 This is a flowchart illustrating an embodiment of a matching method based on multiple setting schemes in a distribution network provided in this application.

[0039] Figure 2 This is a schematic diagram illustrating a basic tuning principle for constructing a rule base, as provided in an embodiment of this application.

[0040] Figure 3 This is a schematic diagram of a tuning scheme configuration provided in an embodiment of this application;

[0041] Figure 4 This is a schematic diagram of a tuning scheme type provided in the embodiments of this application;

[0042] Figure 5 This is a schematic diagram of a modified tuning scheme provided in an embodiment of this application;

[0043] Figure 6 This is a schematic diagram of a matching system embodiment based on multiple setting schemes of a distribution network provided in this application. Detailed Implementation

[0044] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present application.

[0045] Please see Figure 1 The present application provides a matching method based on multiple setting schemes for a distribution network, comprising:

[0046] Step 101: Determine the form of the tuning principles of the rule base, classify the tuning principles and enter the tuning data to generate the expert rule base;

[0047] It should be noted that a rule library is a standardized and scientifically managed library of tuning rules. It allows for the rapid retrieval of specified setpoint rules when tuning principles are needed. Therefore, the first step is to standardize the tuning principle format of the rule library, followed by categorizing and storing the rules within the library. Next, algorithms are used to directly analyze the corresponding rules required for calculating setpoints, and finally, a selection process is performed.

[0048] The rule base's analysis system consists of category I (the classification of rules) and derived rules i under that category (the rule classification of the corresponding equipment or switch). For example, the formula for overcurrent protection of a 10kV distribution transformer is as follows:

[0049] (1) Distribution transformers of 800kVA and above should be set according to the primary value that avoids the maximum fault current on the low-voltage side of the distribution transformer:

[0050] I1=k×I kmax

[0051] In the formula, I kmax The maximum fault current for a three-phase metallic short circuit on the low-voltage side of the distribution transformer is given by K, which is a reliability coefficient of 1.5, and I1 is the primary value for overcurrent stage I.

[0052] (2) Distribution transformers below 800kVA should be set according to the primary value to avoid the inrush current of the distribution transformer:

[0053] I1=k u ×I e

[0054] In the formula, k u I is the inrush current coefficient, taken as 7~12. e This refers to the rated current of the distribution transformer.

[0055] Similarly, all basic setting principles (including overcurrent two-stage setting protection, time, etc.) and setting data are entered into an expert rule base. Then, based on this logical relationship, software algorithms can be applied to multiple setting schemes. As follows: Figure 2 The basic tuning principles for building a rule base are as follows.

[0056] Each of the rule categories I specifically includes:

[0057] Rules for reactors, rules for external lines, rules for station service transformers, rules for tortuous transformers, rules for capacitors, and rules for internal lines.

[0058] Step 102: Based on the expert rule base, configure the setting scheme according to the requirements of the relay protection site, and obtain multiple setting schemes containing major principles and minor principles;

[0059] It should be noted that after building the rule base and establishing the basic setting principles, the setting schemes need to be configured according to the actual needs of the relay protection site. First, the major and minor principles are set according to categories. For example, setting scheme 1: the major principle is to set all main lines to current-type, and the minor principle is to set them to voltage-type when there is automated equipment on the branch line. Setting scheme 2: the major principle is to set all main lines to current-type, and the minor principle is to set them to voltage-type when there is automated equipment on the branch line. Setting scheme 3: the major principle is to set all main lines to current-type, and the minor principle is to set the first automated switch on the branch line to current-type, the intermediate switches to voltage-type, and the final switch to current-type. And so on. The setting schemes are then improved by matching the basic setting principles from the expert rule base as follows: Figure 3 The tuning scheme configuration is shown below. After matching multiple tuning schemes, the result is as follows: Figure 4 The tuning scheme type is shown.

[0060] Step 103: When the distribution network line switchgear needs to be calculated, based on multiple setting schemes, the corresponding setting schemes are set according to the actual needs of the line. Based on the expert rule base, the setting schemes are configured according to the requirements of the relay protection site, resulting in multiple setting schemes containing major principles and minor principles, thereby generating the setting scheme of the line relay protection equipment.

[0061] It should be noted that after the setting scheme is matched, when calculating the switching equipment of the distribution network line, the setting calculation personnel can select the appropriate setting scheme for the relay protection equipment of that distribution network line, as follows: Figure 5 The modified tuning scheme is shown below.

[0062] As long as the setting scheme is modified, the setting switches of all relay protection equipment on the line will automatically match the setting type (i.e., overcurrent, logic, etc.). This method matches multiple sets of setting principles for different types of line laying and relay protection equipment use under large-scale distribution network lines, thereby meeting the current distribution network needs.

[0063] This embodiment provides a matching method based on multiple setting schemes for distribution networks. It uses a unified module to manage an expert rule base and performs unified allocation and configuration of setting schemes. This allows for the management of multiple setting principle schemes and enables open editing of these schemes. Based on the advantages of establishing multiple setting principles, it can adapt setting principles to various applications across large-scale distribution network lines and relay protection equipment. This effectively addresses the combined use of different distribution network lines and equipment, improving the stability and reliability of power grid equipment operation. By establishing an expert rule base and enabling setting scheme editing, this method can analyze various factors affecting the performance of protection setting values ​​after changes in system operation modes. Further research is conducted on methods for online calculation and real-time updating of protection setting values, thereby improving the efficiency of setting value calculation and issuance for distribution networks.

[0064] The above is a matching method based on multiple setting schemes of a distribution network provided in the embodiments of this application. The following is a matching system based on multiple setting schemes of a distribution network provided in the embodiments of this application.

[0065] Please see Figure 6 The matching system based on multiple setting schemes of a distribution network provided in this application embodiment includes:

[0066] The generation unit 201 is used to determine the form of the tuning principles of the rule base, classify the tuning principles and enter the tuning data, thereby generating the expert rule base;

[0067] Configuration unit 202 is used to configure setting schemes based on the expert rule base according to the requirements of the relay protection site, and obtain multiple setting schemes containing major principles and minor principles;

[0068] The setting unit 203 is used to generate a setting scheme for the line relay protection equipment by setting the corresponding major and minor principles according to the actual needs of the line based on multiple setting schemes when the distribution network line switching equipment needs to be calculated.

[0069] Furthermore, this application embodiment also provides a matching device based on multiple setting schemes for a distribution network, the device including a processor and a memory:

[0070] The memory is used to store program code and transmit the program code to the processor;

[0071] The processor is used to execute the steps of the matching method based on multiple setting schemes of the distribution network as described in the above method embodiments, according to the instructions in the program code.

[0072] Furthermore, this application embodiment also provides a computer-readable storage medium for storing program code, which is used to execute the matching method based on multiple setting schemes of the distribution network described in the above method embodiment.

[0073] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working process of the system and unit described above can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0074] The terms “first,” “second,” “third,” “fourth,” etc. (if present) in the specification and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented, for example, in orders other than those illustrated or described herein. Furthermore, the terms “comprising” and “having,” and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0075] It should be understood that in this application, "at least one (item)" means one or more, and "more than" means two or more. "And / or" is used to describe the relationship between related objects, indicating that three relationships can exist. For example, "A and / or B" can represent three cases: only A exists, only B exists, and both A and B exist simultaneously, where A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. "At least one (item) of the following" or similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one (item) of a, b, or c can represent: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, and c can be single or multiple.

[0076] In the several embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection between apparatuses or units through some interfaces, and may be electrical, mechanical, or other forms.

[0077] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0078] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0079] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes: USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, optical disks, and other media capable of storing program code.

[0080] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A matching method based on multiple setting schemes of a power distribution network, characterized in that, The method comprises the following steps: determining the form of the setting principle of the rule base, classifying the setting principle and inputting the setting data, so as to generate an expert rule base; configuring the setting scheme according to the requirements of the relay protection site based on the expert rule base, to obtain multiple sets of setting schemes containing large principles and small principles; when the line switch equipment of the distribution network needs to be calculated, setting the corresponding large principle and small principle according to the actual requirements of the line based on the multiple sets of setting schemes, so as to generate the setting scheme of the line relay protection equipment; the method for determining the form of the setting principle of the rule base, classifying the setting principle and inputting the setting data, so as to generate an expert rule base, specifically comprises: determining the form of the setting principle of the rule base, classifying the setting principle for the first time to obtain rule classification I, and then classifying each rule classification I to obtain a derived rule i containing equipment or switches; inputting the setting data of the derived rule i to generate an expert rule base; each rule classification I specifically comprises: reactor rules, station line rules, station transformer rules, zigzag transformer rules, capacitor rules and station line rules; the method for configuring the setting scheme according to the requirements of the relay protection site based on the expert rule base, to obtain multiple sets of setting schemes containing large principles and small principles, specifically comprises: configuring the setting scheme according to the requirements of the relay protection site based on the expert rule base, to obtain multiple sets of setting schemes, specifically comprising: setting scheme i: the large principle is to set all current types on the main line, and the small principle is to set voltage types when there is automatic equipment on the branch line; setting scheme i+1: the large principle is to set all current types on the main line, and the small principle is to set voltage types when there is automatic equipment on the branch line; setting scheme i+2: the large principle is to set all current types on the main line, and the small principle is to set current types for the first automatic switch on the branch line, voltage types for the intermediate switches, and current types for the last switch.

2. A matching system based on multiple setting schemes of a power distribution network, characterized by, The method comprises the following steps: a generation unit is configured to determine the form of the setting principle of the rule base, classify the setting principle and input the setting data, so as to generate an expert rule base; a configuration unit is configured to configure the setting scheme according to the requirements of the relay protection site based on the expert rule base, to obtain multiple sets of setting schemes containing large principles and small principles; a setting unit is configured to, when the line switch equipment of the distribution network needs to be calculated, set the corresponding large principle and small principle according to the actual requirements of the line based on the multiple sets of setting schemes, so as to generate the setting scheme of the line relay protection equipment; the generation unit is specifically configured to determine the form of the setting principle of the rule base, classify the setting principle for the first time to obtain rule classification I, and then classify each rule classification I to obtain a derived rule i containing equipment or switches; input the setting data of the derived rule i to generate an expert rule base; each rule classification I specifically comprises: reactor rules, station line rules, station transformer rules, zigzag transformer rules, capacitor rules and station line rules; the configuration unit is specifically configured to: configure the setting scheme according to the requirements of the relay protection site based on the expert rule base, to obtain multiple sets of setting schemes, specifically comprising: Setting scheme I: the main principle is to set current type on all main lines, and the minor principle is to set voltage type when there is automatic equipment on branch lines; Setting scheme I+1: the main principle is to set current type on all main lines, and the minor principle is to set voltage type when there is automatic equipment on branch lines; Setting scheme I+2: the main principle is to set current type on all main lines, and the minor principle is to set current type on the first automatic switch on branch lines, set voltage type on intermediate switches, and set current type on the last switch.

3. A matching device based on multiple setting schemes of a power distribution network, characterized by, The device comprises a processor and a memory: The memory is used for storing program codes and transmitting the program codes to the processor; The processor is used for executing the matching method based on multiple setting schemes of distribution network according to instructions in the program codes.

4. A computer-readable storage medium, characterized in that, The computer readable storage medium is used for storing program codes, and the program codes are used for executing the matching method based on multiple setting schemes of distribution network.

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