Optimization Design of High-Frequency Matrix Transformer for Solid-State Transformer

As a key component of the solid-state transformer, high-frequency transformer (HFT) design is important to increase the efficiency and power density of the system. In order to enhance the thermal performance of HFTs, a novel matrix core structure is proposed without increasing volume. Modified calculation models are proposed for predicting electromagnetism and thermal characteristics more precisely. To achieve a balance among the total loss, leakage inductance, power density, insulation distance, and operation temperature of the HFT, a design methodology is established based on multiobjective nondominated sorting genetic algorithm II. A 1 kV, 50 kVA HFT has been manufactured, and experiments, as well as finite-element analysis simulations, have been conducted to validate the reliability of the design methodology. The optimal designed HFT can achieve a power density of 24 kW/dm3and an efficiency of 99.76%. The maximum temperature is 334 K under rated load.