Solid-state transformer and magnetic properties with potential topologies

Solid-state transformers (SSTs) are widely used in the power transmission field owing to their flexible features and the development of power electronic technology. As a key component in SST, medium- and high-frequency transformers convert electromagnetic energy and dominate the overall performance of SSTs. However, the magnetic properties and loss of core material show many differences when the conditions change, including temperature, excitation waveform, and flux density. To improve the accuracy of loss assessments and the reliability of electrical equipment during operations, it is necessary to study the magnetic properties over a wide range of frequencies, temperatures, and excitation types. In this chapter, the general topology of SSTs and the classification of typical core materials are introduced, and their magnetic parameters, such as core loss, permeability, vibration, and noise during magnetization, are analyzed under different operating conditions. Their properties as functions of conditions are systematically compared. The comprehensive performance of core materials is discussed in combination with the experimental results.