A method and device for setting the protection value of a feeder line

Abstract

The embodiment of the application discloses a kind of feeder line adaptive protection setting method and device, in the method, obtain the protection table to be revised, execute first process until obtain the preset number of revised protection table, obtain the preset number of feeder operation data table and the preset number of revised protection table establish prediction model, update prediction model by subsequent line fault data, until the deviation of prediction model reaches preset threshold, then the expected prediction model is obtained.The application is added memory module in the original FTU, to realize the above-mentioned method, can replace the mode that line protection setting is set according to artificial experience in the original line protection process, improves the instability of artificial setting accuracy, personnel waste and so on.

Description

Technical Field

[0001] This invention relates to the field of power system automation technology, and in particular to a method and apparatus for setting adaptive protection settings for feeder lines. Background Technology

[0002] For power systems with voltage levels of 35kV and below, a neutral point not directly grounded system is generally adopted. Its line protection typically employs a three-stage current protection system that responds to voltage and current during faults. This three-stage current protection is completed in conjunction with a monitoring terminal for small-scale line protection. An FTU (Feeder Terminal Unit) is a common small-scale line protection terminal, which usually works in conjunction with a circuit breaker to protect a section of feeder.

[0003] Typically, the FTU protects the feeder according to the default protection settings table. When a fault occurs in the feeder operation, the FTU controls the circuit breaker to operate, and personnel go to the site to assess the circuit breaker's operation. When the circuit breaker malfunctions or delays, personnel will revise the original default protection settings table based on experience.

[0004] This correction method not only wastes manpower, but also has a high probability of causing correction errors, which is not in line with the development direction of power system automation. Summary of the Invention

[0005] This application discloses a method and device for setting adaptive protection settings for feeder lines, which solves the problem that the original line protection settings need to be set based on manual experience, resulting in unstable accuracy and easy errors in correction.

[0006] In a first aspect, this application discloses a method for setting adaptive protection settings for feeder lines, the method comprising:

[0007] Obtain the protection table of settings to be corrected;

[0008] Repeat the first process until a preset number of corrected protection settings are obtained:

[0009] The feeder operation data table and circuit breaker operation status detected by the FTU during a line fault are obtained. Based on the feeder operation data table and circuit breaker operation status, the protection setting table to be corrected is corrected to obtain the corrected protection setting table. The corrected protection setting table is the protection setting table to be corrected in the next first process.

[0010] A prediction model is established based on a preset number of the feeder operation data tables and a preset number of the corrected protection setting tables.

[0011] Repeat the second process until the deviation of the prediction model is less than a preset threshold:

[0012] The feeder operation data table detected by the FTU during the next line fault is added to the prediction model for prediction, and the current prediction value table is obtained. The current prediction value table is then used as a new corrected protection setting table and added to the current feeder operation data table in the prediction model to obtain a new prediction model.

[0013] In one possible implementation, the feeder operation data table includes remote measurement data, which includes three-phase voltage, three-phase current, zero-sequence current, total active power, total reactive power, total apparent power, power factor, frequency, and battery voltage.

[0014] The feeder operation data also includes environmental monitoring data, which includes temperature, atmospheric pressure, and altitude.

[0015] In one possible implementation, the feeder operation data is updated periodically at preset times; and the updated feeder operation data is synchronously transmitted to the master station.

[0016] In one possible implementation, the prediction model is established in the following manner:

[0017] S501, the first data in the preset number of feeder operation data tables is used as the input array, where the first data is any data in the feeder operation protection table;

[0018] S502, the second data in the preset number of protection setting value tables to be corrected is used as an output array, where the second data is the data in the protection setting value tables to be corrected that corresponds to the first data;

[0019] S503, establish a polynomial fitting model based on the input array and the output array;

[0020] S504, add the first data at the next line fault to the polynomial model to obtain the predicted value, add the first data to the input array, add the predicted value as the second data to the output array, and update the polynomial fitting model.

[0021] S505, Repeat step S504 until the deviation of the first data and the second data of the polynomial fitting model is less than 5%, then the prediction model is obtained.

[0022] In one possible implementation, the master station acquires the feeder operation data table of each feeder branch through GPS time synchronization.

[0023] Secondly, this application discloses a feeder line adaptive protection setting device, the device comprising:

[0024] The memory module is used to record the feeder operation data table and circuit breaker operation status detected by the FTU when the line fault occurs, and to record the corrected protection setting table obtained by correcting the protection setting table to be corrected according to the feeder operation data table and circuit breaker operation status. The corrected protection setting table is the protection setting table to be corrected when the next line fault occurs.

[0025] The transmission module is used to transmit the feeder operation data table and the corrected protection setting table back to the master station;

[0026] The control module is configured to establish a prediction model based on a preset number of feeder operation data tables and a preset number of corrected protection setting tables; and to update the prediction model until the deviation of the prediction model is less than a preset threshold, including: adding the feeder operation data table detected by the FTU at the next line fault to the prediction model for prediction, obtaining a current prediction value table, and adding the current prediction value table as a new corrected protection setting table and the current feeder operation data table to the prediction model to fit and obtain a new prediction model.

[0027] In one possible implementation, the feeder operating data includes telemetry data, which includes three-phase voltage, three-phase current, zero-sequence current, total active power, total reactive power, total apparent power, power factor, frequency, and battery voltage.

[0028] The feeder operation data also includes environmental monitoring data, which includes temperature, atmospheric pressure, and altitude.

[0029] In one possible implementation, the FTU acquires feeder operation data at preset time intervals.

[0030] In one possible implementation, the prediction model is established in the following manner:

[0031] S501, the first data in the preset number of feeder operation data tables is used as the input array, where the first data is any data in the feeder operation protection table;

[0032] S502, the second data in the preset number of target protection setting tables is used as an output array, where the second data is the data in the target protection setting table that corresponds to the first data;

[0033] S503, establish a polynomial fitting model based on the input array and the output array;

[0034] S504, add the first data at the next line fault to the polynomial model to obtain the predicted value, add the first data to the input array, add the predicted value as the second data to the output array, and update the polynomial fitting model.

[0035] S505, Repeat step S504 until the deviation of the first data and the second data of the polynomial fitting model is less than 5%, then the prediction model is obtained.

[0036] In one possible implementation, the device further includes a GPS time synchronization module to ensure that data from each feeder branch is transmitted synchronously to the master station.

[0037] This application discloses a method and apparatus for setting adaptive protection settings for feeder lines. The method involves obtaining a protection setting table to be corrected, executing a first process until a preset number of corrected protection setting tables are obtained, acquiring a preset number of feeder operation data tables and a preset number of corrected protection setting tables to establish a prediction model, updating the prediction model using subsequent line fault data, and continuing until the deviation of the prediction model reaches a preset threshold, thus obtaining the expected prediction model. This application achieves the above method by adding a memory module to the existing FTU, which can replace the original method of setting line protection settings based on manual experience during line protection, improving the problems of unstable accuracy and wasted personnel associated with manual settings. Attached Figure Description

[0038] To more clearly illustrate the technical solution of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0039] Figure 1 A flowchart illustrating a method for setting adaptive protection settings for feeder lines, provided in an embodiment of this application;

[0040] Figure 2 A schematic diagram illustrating the prediction model establishment process for a feeder line adaptive protection setting method provided in this application embodiment;

[0041] Figure 3 A schematic diagram of the architecture of a feeder line adaptive protection setting device provided in this application embodiment;

[0042] Figure 4 This is a schematic diagram of the external line layout of a feeder line adaptive protection setting device provided in an embodiment of this application. Detailed Implementation

[0043] To address the issue that the original line protection settings need to be set based on manual experience, which leads to unstable accuracy and is prone to correction errors, this application provides a method and apparatus for setting adaptive protection settings for feeder lines through the following embodiments.

[0044] The first embodiment of this application discloses a method for setting adaptive protection settings for feeder lines. See also... Figure 1 The flowchart of a method for setting adaptive protection settings for feeder lines provided in this embodiment is shown in the figure. This method includes S1-S5.

[0045] S1, Obtain the protection setting table to be corrected. The protection setting table to be corrected is the original default protection setting table of the line when it is obtained for the first time. This table is used to protect the line in the original line protection scheme.

[0046] S2, Repeat the first process: Obtain the feeder operation data table and circuit breaker operation status detected by the FTU during a line fault. Based on the feeder operation data table and circuit breaker operation status, correct the protection setting table to be corrected to obtain the corrected protection setting table. The corrected protection setting table is the protection setting table to be corrected in the next first process.

[0047] The first process is as follows: When a line fault occurs, the circuit breaker trips the protection circuit according to the judgment parameters in the pre-set protection setting table to be corrected. During the first fault, the trip is performed based on the original default protection setting table. Personnel go to the FTU (Fault Tolerant Unit) to determine the correctness of the circuit breaker's tripping action and decide whether to correct the protection setting table based on the judgment result. If the protection setting table needs correction, a corrected protection setting table is obtained and stored in the FTU as a reference table for subsequent line protection. At this point, the corrected protection setting table becomes the new protection setting table to be corrected, awaiting correction for the next line fault.

[0048] In this embodiment, the data table to be corrected includes overcurrent judgment parameters, overvoltage judgment parameters, and reclosing execution parameters. The feeder operation data table includes telemetry data, which includes three-phase voltage, three-phase current, zero-sequence current, total active power, total reactive power, total apparent power, power factor, frequency, and battery voltage. In this embodiment, the feeder operation data also includes environmental monitoring data and control status data. Environmental monitoring data includes temperature, atmospheric pressure, and altitude. Control status data includes the circuit breaker's opening and closing status and circuit breaker parameters. The feeder operation data is updated periodically at preset intervals, and each updated feeder operation data is synchronously transmitted to the master station.

[0049] It is worth noting that, in addition to the data mentioned above, the feeder operation data table may also contain any other data related to the main content of this embodiment, which will not be illustrated in this embodiment.

[0050] S3, determine whether a preset number of corrected protection setting tables have been obtained. If obtained, execute S4; otherwise, continue executing S2.

[0051] S4. Establish a prediction model based on the acquired preset number of feeder operation data tables and preset number of corrected protection setting tables.

[0052] The feeder operation data is updated periodically at a preset time interval, and the updated feeder operation data is synchronously transmitted to the master station. This preset time interval is less than one second. It is worth noting that the feeder operation data table in this embodiment is the one obtained when a line fault occurs and the operator determines that the circuit breaker's opening and closing actions are incorrect, requiring correction of the protection setting table. The data in this feeder operation data table is the feeder operation data recorded in the FTU. Each feeder operation data table corresponds to a corrected protection setting table. Therefore, when a preset number of feeder operation data tables are obtained, a corresponding preset number of corrected protection setting tables can be obtained.

[0053] S5, repeat the second process: add the feeder operation data table detected by the FTU during the next line fault to the prediction model for prediction, obtain the current prediction value table, and add the current prediction value table as a new corrected protection setting table and the feeder operation data table of this time to the prediction model to fit and obtain a new prediction model.

[0054] S6. Determine whether the prediction model has reached the preset threshold. If it has, then the prediction model is the desired prediction model. If it has not, continue to execute the S5 process.

[0055] See Figure 2 The prediction model establishment process of the adaptive protection setting method for feeder lines provided in this embodiment includes steps S501-S505.

[0056] S501, take the first data of a preset number of feeder operation data tables as the input array, where the first data is any data in the feeder operation protection table;

[0057] S502, take a preset number of second data from the protection setting table to be corrected as an output array, where the second data is the data in the protection setting table to be corrected that corresponds to the first data;

[0058] S503, establish a polynomial fitting model based on the input array and the output array;

[0059] S504: Add the first data at the next line fault to the multinomial model to obtain the predicted value, add the first data to the input array, add the predicted value as the second data to the output array, and update the multinomial fitting model.

[0060] S505, Repeat step S504 until the deviation between the first and second data of the polynomial fitting model is less than 5%, then the prediction model is obtained.

[0061] The process involves using the same element data from a predetermined number of feeder operation data tables as the first data to form an input array, and the same element data from the corrected protection setting table as the second data to form an output array. A polynomial fitting model is then established using these input and output arrays. When a line fault occurs again, this element data is added to the polynomial model to predict the value. This predicted value is then added to the input array as the first data, and the predicted value is added to the output array as the second data. The original polynomial fitting model is updated using the new input and output arrays. When a new line fault occurs, the polynomial fitting model is updated in the same way until the deviation of the polynomial fitting model is less than 5%, at which point the expected prediction model is obtained.

[0062] Examples are given below:

[0063] Assume the input array is represented as X(n), where X(n) contains elements X1, X2, X3...Xn, and the output array is represented as Y(n), where Y1, Y2, Y3...Yn. Through polynomial fitting, find the correspondence A between arrays X(n) and Y(n), obtain new feeder running data Xn+1, and calculate the prediction result Z1 using correspondence A. Add Xn+1 to the input array and Z1 to the output array, updating correspondence A to obtain A1. Repeat this process to obtain Z2, Z3, Z4...Zm. At this point, Z1, Z2, and Z3 correspond to Yn+1, Yn+2, Yn+3...Yn+m. Calculate the deviation. When E is less than 5%, the prediction model is complete.

[0064] It is worth noting that the data table to be corrected includes overcurrent judgment parameters, overvoltage judgment parameters, and reclosing execution parameters. The feeder operation data table includes telemetry data, which includes three-phase voltage, three-phase current, zero-sequence current, total active power, total reactive power, total apparent power, power factor, frequency, and battery voltage. In this embodiment, the feeder operation data also includes environmental monitoring data and control status data. The environmental monitoring data is obtained by the environmental monitoring module and includes temperature, atmospheric pressure, and altitude. The control status data includes the circuit breaker's opening and closing status and circuit breaker parameters.

[0065] It is worth noting that a corresponding prediction model can be built for each element in the feeder operation data table to predict the predicted value for each element. This predicted value is the data to be modified in the protection setting table to be corrected.

[0066] The main station obtains the feeder operation data tables of each feeder branch through GPS time synchronization.

[0067] The first embodiment of this application discloses a method for setting adaptive protection settings for feeder lines. In this method, a protection setting table to be corrected is obtained; a first process is executed until a preset number of corrected protection setting tables are obtained; a preset number of feeder operation data tables and a preset number of corrected protection setting tables are obtained to establish a prediction model; the prediction model is updated using subsequent line fault data until the deviation of the prediction model reaches a preset threshold, thus obtaining the expected prediction model. This application achieves the above method by adding a memory module to the existing FTU, which can replace the original method of setting line protection settings based on manual experience during line protection, improving the problems of unstable accuracy and wasted personnel associated with manual settings.

[0068] The second embodiment of this application discloses a feeder line adaptive protection setting device, see [link to relevant documentation]. Figure 3 A schematic diagram of the architecture of a feeder line adaptive protection setting device according to this embodiment is shown. The device includes:

[0069] The memory module records the feeder operation data table and circuit breaker operation status detected by the FTU during line faults. It also records the revised protection setting table obtained by correcting the protection setting table to be corrected based on the feeder operation data table and circuit breaker operation status. This revised protection setting table serves as the protection setting table to be corrected for the next line fault. In this embodiment, the memory module pre-acquires the protection setting table to be corrected. During each line fault, the memory module synchronously stores the feeder operation data table stored in the FTU at that time. When the protection setting table to be corrected is corrected, the memory module stores the revised protection setting table, which also serves as the protection setting table to be corrected for the next line fault.

[0070] The device also includes a transmission module for transmitting the feeder operation data table and the revised protection setting table back to the master station.

[0071] The device also includes a control module, which is used to establish a prediction model based on a preset number of feeder operation data tables and a preset number of corrected protection setting tables; and to update the prediction model until the deviation of the prediction model is less than a preset threshold, including: adding the feeder operation data table detected by the FTU at the next line fault to the prediction model for prediction, obtaining the current prediction value table, and adding the current prediction value table as a new corrected protection setting table and the current feeder operation data table to the prediction model to fit and obtain a new prediction model.

[0072] The prediction model is established in the following way:

[0073] S501, take the first data of a preset number of feeder operation data tables as the input array, where the first data is any data in the feeder operation protection table;

[0074] S502, take a preset number of second data from the protection setting table to be corrected as an output array, where the second data is the data in the protection setting table to be corrected that corresponds to the first data;

[0075] S503, establish a polynomial fitting model based on the input array and the output array;

[0076] S504: Add the first data at the next line fault to the multinomial model to obtain the predicted value, add the first data to the input array, add the predicted value as the second data to the output array, and update the multinomial fitting model.

[0077] S505, Repeat step S504 until the deviation of the polynomial fitting model is less than 5%, then the prediction model is obtained.

[0078] The process of adding the feeder operation data table detected by the FTU at the next line fault to the prediction model to obtain the current prediction value table is as follows:

[0079] A pre-defined number of feeder operation data tables are used as the first data to form an input array, and the corrected data of the same element from the protection setting table to be corrected is used as the second data to form an output array. A polynomial fitting model is established using the input and output arrays. When the next line fault occurs, the same element data is added to the polynomial model to predict the value. The predicted value is then added to the input array as the first data, and the predicted value is added to the output array as the second data. The original polynomial fitting model is updated using the new input and output arrays. When a new line fault occurs, the polynomial fitting model is updated again in the aforementioned manner until the deviation of the polynomial fitting model is less than 5%, thus obtaining the expected prediction model. For an example, please refer to the specific description of a feeder line adaptive protection setting method disclosed in the embodiments of this application, which will not be repeated here.

[0080] In one implementation, the FTU acquires feeder operation data at preset time intervals.

[0081] In one implementation, the device also includes a GPS time synchronization module to ensure that data from each feeder branch is transmitted synchronously to the master station.

[0082] See Figure 4 The external line layout diagram of a feeder line adaptive protection setting device provided in this application embodiment is shown. The device realizes the synchronous transmission of data with each feeder branch to the main station through a GPS time synchronization module. Figure 4 The fault recording device is used to acquire feeder operation data when a line fault occurs on a branch line.

[0083] The effects of the above-mentioned device when applying the aforementioned method can be found in the description of the aforementioned method embodiments, and will not be repeated here.

[0084] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the application disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this application are indicated by the claims.

[0085] For similar or identical parts among the various embodiments in this specification, please refer to each other.

Claims

1. A method for setting adaptive protection settings for feeder lines, characterized in that, The method includes: Obtain the protection setting table to be corrected; Repeat the first process until a preset number of corrected protection settings are obtained: The feeder operation data table and circuit breaker operation status detected by the FTU during a line fault are obtained. Based on the feeder operation data table and circuit breaker operation status, the protection setting table to be corrected is corrected to obtain the corrected protection setting table. The corrected protection setting table is the protection setting table to be corrected in the next first process. A prediction model is established based on a preset number of the feeder operation data tables and a preset number of the corrected protection setting tables. Repeat the second process until the deviation of the prediction model is less than a preset threshold: The feeder operation data table detected by the FTU during the next line fault is added to the prediction model for prediction, and the current prediction value table is obtained. The current prediction value table is then used as a new corrected protection setting table and added to the current feeder operation data table for prediction model to obtain a new prediction model. The prediction model is established in the following way: S501, take the first data from a preset number of feeder operation data tables as an input array, where the first data is any data from the feeder operation protection table; S502, take a preset number of second data from the modified protection setting table as an output array, where the second data is the data in the modified protection setting table that corresponds to the first data; S503, establish a polynomial fitting model based on the input array and the output array; S504, add the first data at the next line fault to the polynomial fitting model to obtain the predicted value, add the first data to the input array, add the predicted value as the second data to the output array, and update the polynomial fitting model. S505, Repeat step S504 until the deviation of the first data and the second data of the polynomial fitting model is less than 5%, then the prediction model is obtained.

2. The method for setting adaptive protection settings for feeder lines according to claim 1, characterized in that, The feeder operation data table includes remote measurement data, which includes three-phase voltage, three-phase current, zero-sequence current, total active power, total reactive power, total apparent power, power factor, frequency, and battery voltage. The feeder operation data also includes environmental monitoring data, which includes temperature, atmospheric pressure, and altitude.

3. The method for setting adaptive protection settings for feeder lines according to claim 1, characterized in that, The feeder operation data is updated at a preset time interval; The updated feeder operation data is synchronously transmitted to the master station.

4. The method for setting adaptive protection settings for feeder lines according to claim 3, characterized in that, The main station obtains the feeder operation data tables of each feeder branch through GPS time synchronization.

5. A feeder line adaptive protection setting device, characterized in that, The device includes: The memory module is used to record the feeder operation data table and circuit breaker operation status detected by the FTU when the line fault occurs, and to record the corrected protection setting table obtained by correcting the protection setting table to be corrected according to the feeder operation data table and circuit breaker operation status. The corrected protection setting table is the protection setting table to be corrected when the next line fault occurs. The transmission module is used to transmit the feeder operation data table and the corrected protection setting table back to the master station; The control module is configured to establish a prediction model based on a preset number of feeder operation data tables and a preset number of corrected protection setting tables; and to update the prediction model until the deviation of the prediction model is less than a preset threshold, including: adding the feeder operation data table detected by the FTU at the next line fault to the prediction model for prediction, obtaining a current prediction value table, and adding the current prediction value table as a new corrected protection setting table and the current feeder operation data table to the prediction model to fit and obtain a new prediction model; The prediction model is established in the following way: S501, take the first data from a preset number of feeder operation data tables as an input array, where the first data is any data from the feeder operation protection table; S502, take a preset number of second data from the modified protection setting table as an output array, where the second data is the data in the modified protection setting table that corresponds to the first data; S503, establish a polynomial fitting model based on the input array and the output array; S504, add the first data at the next line fault to the polynomial fitting model to obtain the predicted value, add the first data to the input array, add the predicted value as the second data to the output array, and update the polynomial fitting model. S505, Repeat step S504 until the deviation of the first data and the second data of the polynomial fitting model is less than 5%, then the prediction model is obtained.

6. The adaptive protection setting device for feeder lines according to claim 5, characterized in that, The feeder operation data includes telemetry data, which includes three-phase voltage, three-phase current, zero-sequence current, total active power, total reactive power, total apparent power, power factor, frequency, and battery voltage. The feeder operation data also includes environmental monitoring data, which includes temperature, atmospheric pressure, and altitude.

7. The adaptive protection setting device for feeder lines according to claim 5, characterized in that, The FTU acquires feeder operation data at preset time intervals.

8. The adaptive protection setting device for feeder lines according to claim 5, characterized in that, The device also includes a GPS time synchronization module to ensure that data from each feeder branch is transmitted synchronously to the main station.

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