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A fault area diagnosis method and system for AC/DC hybrid power grid based on LSTM

A technology of AC-DC hybrid connection and fault area, which is applied in the directions of fault location, neural learning method, information technology support system, etc. It can solve the problem of affecting the accuracy of fault diagnosis, difficulty in setting model parameters, and inability to effectively apply to AC-DC hybrid power grids, etc. question

Active Publication Date: 2021-05-18
HUAZHONG UNIV OF SCI & TECH +3
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  • Description
  • Claims
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Problems solved by technology

[0004] Aiming at the defects of the prior art, the purpose of the present invention is to provide an LSTM-based method and system for diagnosing fault areas of AC / DC hybrid power grids, aiming to solve the problem that existing power system fault diagnosis methods rely on expert knowledge and experience and require manual screening It is difficult to set the effective characteristics and model parameters, and it cannot be effectively applied to the AC-DC hybrid power grid, thus affecting the technical problems of the accuracy of fault diagnosis

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  • A fault area diagnosis method and system for AC/DC hybrid power grid based on LSTM
  • A fault area diagnosis method and system for AC/DC hybrid power grid based on LSTM
  • A fault area diagnosis method and system for AC/DC hybrid power grid based on LSTM

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Embodiment Construction

[0039] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not constitute a conflict with each other.

[0040] An embodiment of the present invention provides an LSTM-based method for diagnosing a fault region of an AC / DC hybrid power grid, including:

[0041] Step 1. Construct a time-domain simulation model of the AC-DC hybrid power grid, simulate and obtain the voltage amplitude data of the entire network nodes under various operating conditions, and mark the labels corresponding to the fault co...

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Abstract

The invention belongs to the technical field of electric power system transmission safety, and discloses an LSTM-based method and system for diagnosing a fault area of ​​an AC / DC hybrid power grid. Including: building a power system time-domain simulation model to simulate various working conditions to obtain the voltage amplitude of the entire network node and the corresponding label to obtain the basic sample set; using the sliding window method to intercept the basic sample to obtain the sample set for training the fault time judgment model and the fault area judgment model Carry out training and properly adjust the relevant parameters of the model; input the samples at the current sliding window time, the fault time judgment model judges whether a fault occurs, and if a fault is confirmed, input the samples into the fault area judgment model to obtain the fault location; finally output the current fault diagnosis information. The invention uses a deep neural network to quickly and effectively determine the time of fault occurrence in the power grid and determine the fault area, has better performance under different operating conditions and certain noise conditions, and can meet the needs of fault diagnosis in complex power systems.

Description

technical field [0001] The invention belongs to the technical field of electric power system transmission safety, and more specifically relates to an LSTM-based method and system for diagnosing a fault region of an AC / DC hybrid power grid. Background technique [0002] Fast and accurate fault diagnosis of power system after a fault occurs is of great significance for clearing faults, restoring power supply and maintaining system stability. With the large-scale access of the DC system, the AC-DC coupling of my country's power grid is becoming increasingly tight, and the failure of the AC system can easily cause commutation failure or even blockage of the DC system, thereby affecting the stability of the power system. The traditional diagnosis method based on the relay protection of AC system is difficult to be directly applied to the AC-DC hybrid power grid for effective fault diagnosis. Due to the nonlinearity of the DC system and the complexity of DC control in the AC-DC h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/08G06K9/62G06N3/04G06N3/08
CPCG01R31/086G01R31/088G06N3/049G06N3/08G06N3/045G06F18/24Y04S10/52
Inventor 姚伟李舟平曾令康艾小猛马士聪赵兵文劲宇
Owner HUAZHONG UNIV OF SCI & TECH
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