CN-121983907-A - Intelligent relay protection system integrating relay protection knowledge and data

CN121983907ACN 121983907 ACN121983907 ACN 121983907ACN-121983907-A

Abstract

The invention discloses an intelligent relay protection system with relay protection knowledge and data fusion, wherein a data acquisition module acquires power system operation parameters required by first-third relay protection, a fault recognition module inputs the power system operation parameters into corresponding first-third relay protection fault recognition models respectively and obtains corresponding fault recognition results, a tripping module determines whether to output corresponding tripping information according to the fault recognition results, the first relay protection is line protection with distribution parameter characteristics, the second relay protection is main equipment protection with ferromagnetic characteristics, and the third relay protection is element protection with circuit relation only. The invention can adapt to the complex fault working condition of the novel power system, does not depend on numerous protection fixed values, pressing plates and the like, greatly reduces the workload of operation and maintenance personnel and the number of equipment, and greatly reduces the running operation risk.

Inventors

XING WU
CHEN QI
XUE MINGJUN
YANG LIMING
WANG ZHE
REN TING
WANG YUTING

Assignees

南京国电南自电网自动化有限公司

Dates

Publication Date: 20260505
Application Date: 20260408

Claims (10)

1. A relay protection system, comprising: the data acquisition module is used for respectively acquiring the first power system operation parameter required by the first relay protection type, the second power system operation parameter required by the second relay protection type and the third power system operation parameter required by the third relay protection type; the fault recognition module is used for inputting the first power system operation parameter, the second power system operation parameter and the third power system operation parameter into a first type relay protection fault recognition model, a second type relay protection fault recognition model and a third type relay protection fault recognition model respectively to obtain a first type relay protection fault recognition result, a second type relay protection fault recognition result and a third type relay protection fault recognition result respectively; The tripping module is used for determining whether to output corresponding tripping information according to the first type relay protection fault identification result, the second type relay protection fault identification result and the third type relay protection fault identification result respectively; The first relay protection is line protection with distributed parameter characteristics, and comprises long line protection; The second type of relay protection is main equipment protection with ferromagnetic characteristics, and comprises transformer protection, reactor protection, motor protection and generator protection; The third type of relay protection is element protection only with circuit relation, and comprises bus protection and short lead protection.
2. The relay protection system of claim 1, wherein the first power system operating parameter, the second power system operating parameter, and the third power system operating parameter each comprise corresponding current information, voltage information, switch position information, and line topology information.
3. The relay protection system of claim 2, wherein the first, second, and third types of relay protection fault identification models each comprise a temporal type model and an image identification type model; The time sequence type protection model is used for outputting two types of results of equipment failure or non-equipment failure, and is used for outputting two types of results of action time and non-action; the image recognition type model comprises an image recognition type main protection model and an image recognition type standby protection model, wherein the image recognition type main protection model is used for outputting two types of results of equipment failure or non-equipment failure, and the image recognition type standby protection model is used for outputting two types of results of action time and non-action.
4. The relay protection system according to claim 3, wherein the collected first power system operation parameter, second power system operation parameter and third power system operation parameter are converted into time sequence type data as input of a time sequence type model, wherein the current information and the voltage information are normalized to be data in a range of [ -1,1], and are arranged according to time sequence, the switch position information is represented as (0, 1) state data, and are also arranged according to time sequence, an M x N matrix is formed, M is the number of channels, N is the time sequence length, n=f x t, wherein F is the sampling frequency, t is the sampling time, and the rows of the matrix are the voltage information, the current information and the switch position information from top to bottom.
5. The relay protection system according to claim 3, wherein the collected first power system operation parameter, the collected second power system operation parameter and the collected third power system operation parameter are converted into image pixel data to be used as input of an image recognition type model, wherein the collected current and voltage quantity is directly converted into a pixel matrix of an image, no picture is generated, and meanwhile, the image pixel matrix adopts a gray level graph to reduce the image dimension, reduce the operation calculation amount of the model and accelerate the recognition speed; The calculation formula for converting the sampling data into the pixel matrix is as follows: Pixel values T xy = 0 for X rows and Y columns, where X = h X D n /(D max -D min ), Y = n, h is the total number of rows of the pixel matrix for the model design, D n is the nth sample data, D max is the sample data maximum, D min is the sample data minimum, and other row pixel values T jy = 255 for Y columns, where j is not equal to X.
6. The relay protection system according to claim 3, wherein the time sequence type main protection model and the image recognition type main protection model are used for performing fault recognition independently in a set protection area, and the time sequence type backup protection model and the image recognition type backup protection model are used for protecting a next-stage area according to input line topology information besides being responsible for protection of a current-stage area.
7. The relay protection system according to claim 3, wherein the time sequence model introduces relay protection knowledge by setting an impedance module, a difference flow module, a fourier algorithm module, a wavelet transformation module and/or a sequence component module, and takes an output result with the relay protection knowledge as a basis for fault identification of the time sequence model; The image recognition model introduces relay protection knowledge by setting an impedance module, a differential flow module, a harmonic module, a mutation module and/or a sequence component module, and takes an output result with the relay protection knowledge as a basis for fault recognition of the image recognition model.
8. The relay protection system according to claim 7, wherein the output result of the time sequence model is a voting result of multi-module identification, the time sequence model performs fault identification based on output results with relay protection knowledge output by the impedance module, the difference flow module, the fourier algorithm module, the wavelet transform module and/or the sequence component module respectively, counts the number of modules determined to be faulty, and when the number of modules determined to be faulty reaches a set value, the output result of the time sequence model is faulty; The output result of the image recognition type model is a voting result of multi-module recognition, the image recognition type model respectively carries out fault recognition based on the output result with relay protection knowledge output by the impedance module, the difference flow module, the harmonic module, the mutation module and/or the sequence component module, the number of modules judged to be faults is counted, and when the number of modules judged to be faults reaches a set value, the output result of the image recognition type model is faults.
9. The relay protection system of claim 8, wherein when the output results of the time sequence type model and the image recognition type model in the first type relay protection are both faults, the first type relay protection fault recognition result is a fault; When the output results of the time sequence type model and the image recognition type model in the second type relay protection are faults, the second type relay protection fault recognition result is a fault; and when the output results of the time sequence type model and the image recognition type model in the third type relay protection are faults, the third type relay protection fault recognition result is a fault.
10. The relay protection system of claim 1, further comprising a display module configured to display device model number, device operation information, input quantity information, fault identification model structure and version information, and model reasoning information for each start-up and operation of the device.

Description

Intelligent relay protection system integrating relay protection knowledge and data Technical Field The invention belongs to the technical field of relay protection, and particularly relates to an intelligent relay protection system integrating relay protection knowledge and data. Background Relay protection is a first defense line for safe and stable operation of a power system, and has the core effects of monitoring the operation state of power equipment (such as a power transmission line, a transformer, a generator and the like) in real time through a relay protection device, and rapidly and accurately sending out instructions, isolating fault elements and triggering alarm signals when faults or abnormal working conditions are detected. This transient response mechanism is critical to prevent local faults from evolving into large-area power outage incidents. Relay protection needs to meet reliability, selectivity, sensitivity and rapidity. The reliability ensures that the protection device does not reject actions when the protection device should act and does not malfunction when the protection device should act, selectively ensures that the fault equipment is cut off only, maintains the normal operation of a non-fault part to the maximum extent, sensitively reflects the response capability of protection to the fault, and rapidly requires that the fault is cut off at the shortest time limit, thereby reducing the damage degree of the equipment and the risk of transient stable damage of the system. Therefore, relay protection is one of core infrastructures for guaranteeing energy safety and supporting social electrification process. With the expansion of the power grid scale, the access of new energy and the popularization of direct current transmission, fault characteristics tend to be complicated, a protection system faces adaptability and coordination challenges, and a protection principle realized by using specific characteristics traditionally has difficulty in adapting to the new challenges. Along with the rapid increase of the number of equipment, the new construction, the reconstruction and the reconstruction of a transformer substation and the like, once the topology of a network frame changes, hundreds of protection devices in the associated transformer substation are required to calculate protection fixed values, the setting and the modification are carried out, the workload is extremely large, errors are extremely easy to occur, the safe and stable operation of a power grid is seriously affected due to the occurrence of accidents caused by the fixed value errors, and at present, operation and maintenance staff are difficult to bear the operation and maintenance of the large-scale equipment, so that an intelligent relay protection device and system are needed to realize the autonomous identification of faults, and the manpower requirement is greatly reduced. Disclosure of Invention In order to solve the defects in the prior art, the intelligent relay protection system integrating relay protection knowledge and data can adapt to complex fault working conditions of a novel power system, meanwhile, the intelligent relay protection system does not depend on numerous protection fixed values, pressing plates and the like, the workload and the equipment quantity of operation and maintenance personnel are greatly reduced, and meanwhile, the operation risk is greatly reduced. The technical scheme includes that the relay protection system comprises a data acquisition module, a fault identification module, a tripping module and a relay protection module, wherein the data acquisition module is used for respectively acquiring a first type of relay protection required power system operation parameter, a second type of relay protection required power system operation parameter and a third type of relay protection required power system operation parameter, the fault identification module is used for respectively inputting the first type of relay protection fault identification model, the second type of relay protection fault identification model and the third type of relay protection fault identification model into the first type of relay protection operation parameter, the second type of relay protection fault identification model and the third type of relay protection fault identification model, respectively acquiring a first type of relay protection fault identification result, a second type of relay protection fault identification result and a third type of relay protection fault identification result, and determining whether to output corresponding tripping information according to the first type of relay protection fault identification result, the second type of relay protection fault identification result and the third type of relay protection fault identification result, wherein the first type of relay protection is line protection with distribution parameter characteristics, the second type of relay pr