Journal
IEEE SENSORS JOURNAL
Volume 21, Issue 12, Pages 13695-13703Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JSEN.2021.3071935
Keywords
Feature extraction; Transforms; Time-frequency analysis; Sensors; Transient analysis; Reliability; Power system reliability; Power quality detection; hyperbolic window s-transform; deep neural network; stacked autoencoder; classification
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This study developed a deep neural network for feature extraction and classification of power quality disturbances in electrical power system network, demonstrating high accuracy in classifying various PQ events. The framework proposed is practical for power quality monitoring in electrical power systems.
With the fast development of power grid the usage of electrical equipments is increased which led to importance of power quality disturbance sensing for reliable and smooth operation. In this paper, a deep neural network has been designed using stacked autoencoder (SAE) for deep feature extraction from time-frequency spectrum of single and combined PQ disturbances in electrical power system network. For this purpose, synthetic PQ signals are analyzed in time-frequency domain through hyperbolic window stockwell transform (HWST). Thereafter, PQ signal converted HWST time-frequency matrix has been grouped into time-frequency blocks and subsequently fed as input to 3-layer stacked autoencoder model (SAE) for deep feature learning. Finally, the extracted deep features are classified through several machine learning classifier. The results indicate that proposed framework using XGboost classifier can classify 18 different single and combined PQ event with a 99.86% accuracy. The proposed framework also yields satisfactory outcome with real life PQ data. Therefore, proposed framework can be implemented for Power quality monitoring in electrical power system.
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