Physics-Inspired Time-Frequency Feature Extraction and Lightweight Neural Network for Power Quality Disturbance Classification

Zhiwen Hou^1*Boyu Wang¹Jingrui Liu¹Yumeng He²Yuxuan Yao¹

• ¹Chongqing University, Chongqing, China
• ²Sichuan University, Chengdu, Sichuan Province, China

This study proposes a lightweight and efficient classification method for Power Quality Disturbances (PQDs) using the PowerMobileNet model, which combines the S-transform for time-frequency feature extraction and the MobileNetV3-CBAM neural network for enhanced classification performance. Extensive experiments demonstrate that PowerMobileNet achieves a prediction accuracy of 99.33%, significantly surpassing traditional Convolutional Neural Networks (CNNs) at 97.07% and MobileNetV3-SE at 98.58%. Compared to other state-of-the-art models, PowerMobileNet outperforms KELM (97.4%), SqueezeNet (99.0%), ShuffleNet V2(98.6%), and AlexNet (98.3%) in terms of classification accuracy. Additionally, it exhibits superior robustness under various signal-to-noise ratio (SNR) conditions, maintaining high accuracy even at low SNR levels (e.g., 90% accuracy at 20 dB). The model's parameter count is drastically reduced to 374,632 (1.43 MB), compared to the traditional CNN's 112,094,345 (427.61 MB), making it highly suitable for resource-constrained environments.Furthermore, PowerMobileNet demonstrates the shortest runtime, with a training duration of 925 seconds and a classification time of 0.57 seconds. These results validate the effectiveness and efficiency of PowerMobileNet for real-time PQD classification, offering significant potential for practical power quality monitoring applications.