Abstract
This paper presents a comprehensive investigation of several configurations and control strategies adopted for Smart Transformer (ST). The ST structure is composed of three stages, namely, input stage, isolation stage, and output stage. The latter are implemented using different power conversion topologies. These topologies operate under variant voltage and current levels, which leads to the generation of high conduction and switching power losses. To overcome these issues, multilevel converters are proposed in this paper for the input stage. Particularly, the cascaded H-bridge (CHB), and neutral point clamped converters are used. Furthermore, the ST's dynamic performance is considered and a Sliding Mode Controller is introduced. Numerical simulations of the proposed structures are performed using Matlab/Simulink under disturbed operating modes. A comparative evaluation of the different topologies is, then, established. The obtained results show that the CHB is the most adequate configuration and the improved performance of the proposed controller are verified.
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