Design and Optimization of a High-Frequency Six-Port Solid-State Transformer

This paper presents a novel design of a highfrequency, six-port multi-port Solid-State Transformer (MPSST), utilizing a toroidal magnetic core made of ferrite material. Unlike previous studies that focused on two-port and four-port SST designs, this work proposes a six-port configuration comprising three input ports and three output ports, each rated at 10 kW and operating at a frequency of 100 kHz. One input port operates at 400 V and is connected to the grid, while the remaining two input ports operate at 1 kV and are each connected to a separate PV system. The output ports are connected to local DC loads. The high-frequency transformer (HFT) is optimized to maximize efficiency while minimizing core losses, winding losses, and transformer volume, ensuring operation within the linear magnetic flux region. This optimization is achieved by determining the optimal core dimensions, winding radius, and number of turns for each winding. Additionally, this study investigates the impact of input and output port placement on MPSST efficiency and magnetic flux distribution. The MPSST is simulated and analyzed using COMSOL Multiphysics software, examining the system in both time and frequency domains. The results demonstrate that the efficiency of the system is significantly influenced by the configuration of the input and output ports, with alternating input and output ports around the core achieving higher efficiency compared to grouping all input ports on one side of the core.