Development of a 100 kW, 12.5 kV, 22 kHz and 30 kV insulated medium frequency transformer for compact and reliable medium voltage power conversion

Sensitivity Analysis of Medium-Frequency Transformer Designs for Solid-State Transformers

“…Combining (2), (3),(4), (6), (8), (9) and (10), the reference parameters of the MFT within each SRC cell, leakage and magnetizing inductance refered to the primary side, can be expressed in function of the total converter ratings and the number of cells with (11) and 12, respectively.…”

“…Note that despite being an interesting design alternative, oil based designs have not been considered in this study as they in general require additional expansion vessels and radiators [11] or some other type of external heat exchanger [16] which make a fair design comparison very difficult, unless these are properly taken into account as well.…”

“…The research interest in the area has intensified recently, both in academic and industrial domain, dealing with modeling and overall design optimization of the MFT [5]- [9] and specific design challenges such as insulation coordination [10] or multi-winding design [11]. Several MFT prototype examples have been presented: litz wire / solid / metglas / 25 kW / 2 kHz [5], litz wire / nanocrystalline and ferrite / 166 kW/20 kHz [6], litz wire / nanocrystalline and ferrite /50 kW / 5 kHz [7], litz wire / ferrite / 100 kW / 10 kHz [8], litz wire / nanocrystalline / 240 kW / 10 kHz [10], litz wire / nanocrystalline / 100 kW / 15 − 22 kHz [11]. Even though these MFT prototypes have all been custom made for various technical requirements, it is possible to identify the most popular materials and design choices.…”

FEM-Based Statistical Data-Driven Modeling Approach for MFT Design Optimization

“…In solid state transformer (SST) [4] applications, a proper design of the MFT electric parameters, especially the MFT leakage inductance, is important for the proper converter operation [5]. While it is possible to quite accurately model the leakage inductance of the typical symmetric 2-winding transformer geometries, using light-weight analytic models [6]- [8], in case of frequently encountered asymmetric multiwinding structures [9], [10], such as shown in Fig. 3, all of the available methods (e.g.…”

Sensitivity Analysis of Medium Frequency Transformer Design

“…The research interest in the area has intensified recently, both in academic and industrial domain, dealing with modeling and optimization [2]- [5] and specific design challenges such as insulation coordination [6] or multi-winding design [7].…”