State monitoring of switching power supply in power system based on time series voltage waveform and image analysis

The switching power supply is widely used in the secondary equipment of the power grid. The failure of the switching power supply will cause the protection device to malfunction, leading to a risk of large‐scale power failure. In this paper, a real‐time monitoring method based on only output voltage information is proposed. The experiment shows that this parameter‐reduced approach, relying only on voltage information, outperforms the existing method in detection accuracy. A real‐time monitoring method based on time series voltage waveform and image analysis for switching power supply is proposed and validated. The two methods, namely voltage waveform deviation assessment and voltage waveform image analysis, are integrated to further improve the fault detection performance for switching power supply by the D‐S evidence theory.