Dynamic State Estimation Based Monitoring of High Frequency Transformer

Solid-state transformer (SST) is considered as a promising option for interfacing between different voltage levels in power systems. High frequency transformer (HFT), as the core of SST, needs to be continuously monitored to ensure its operating health. This paper presents a dynamic state estimation based approach that monitors the health status such as winding deformation of HFT. The proposed method is constructed upon the detailed high-fidelity HFT device model. With the device model and given measurements, an overall measurement model of the monitored HFT is formulated. Then, a dynamic state estimation algorithm is performed directly on the measurement model, and a health status observer is designed to check the consistency between the measurements and the HFT device model. A use case is applied in this paper for demonstration and it substantiates the proposed method by checking the health status of the monitored HFT.