Unidirectional grounding fault feeder line identification method under sample imbalance

A single-phase-to-ground fault and identification method technology, applied in signal pattern recognition, neural learning method, character and pattern recognition, etc. Solve the problem of training overfitting, improve the recognition accuracy, and improve the effect of recognition performance

CN114218988APending Publication Date: 2022-03-22福建中试所电力调整试验有限责任公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2022-03-22

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Abstract

The invention provides a single-phase earth fault feeder line identification method under sample imbalance, aiming at the problems of lack and imbalance of single-phase earth fault data of a power distribution network, sufficient and balanced training data information can be provided for a data driving model, so that more accurate single-phase earth fault feeder line identification work is carried out. By utilizing the semi-supervised learning characteristic of the conditional generative adversarial network, through the game adversarial training of a generator and a discriminator, the generator generates a single-phase earth fault sample of which the data distribution characteristic is consistent with the real data distribution characteristic, thereby realizing the balance of fault feeder waveform data and sound feeder waveform data, increasing the basic number of training set samples, and improving the training efficiency. And the identification accuracy of the data-driven fault feeder line identification method is improved.
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Description

technical field

[0001] The invention relates to a one-way ground fault feeder identification method under unbalanced samples, aims at the lack and imbalance of single-phase ground fault data in distribution networks, and belongs to the technical field of comprehensive processing of distribution network ground faults. Background technique

[0002] As the system network closest to the user terminal in the power system, the distribution network plays a vital role in the power system. With the gradual increase of cable feeders, the line-to-ground capacitive current continues to increase, and the system is prone to ground faults. Due to lightning, bird damage, tree growth, equipment failure and other reasons, distribution network faults occur frequently, among which single-phase ground faults account for about 80% of the total faults. When a single-phase ground fault occurs in the distribution network, the fault current characteristics are weakened due to the use of the arc supp...

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Embodiment Construction

[0032] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention, and the described embodiments are only some of the embodiments of the present invention, not all of them.

[0033] see figure 1 , the present invention provides a single-phase ground fault feeder identification method under unbalanced samples, which specifically includes the following steps:

[0034] S1. On-site single-phase ground fault case screening, collect the first half-wave zero-sequence current signal of the first section of each feeder of the faulty main station, after a single-phase ground fault occurs, start collecting the first half-wave zero-sequence current signal of each feeder line, sampling The frequency is 10kHz, and the sampling time is 0.1s. Therefore, the first half-wave signal of the zero-sequence current in the first section of each feeder is ...