DESIGN AND DEVELOPMENT OF MODULAR MULTILEVEL CONVERTER FOR SOLID STATE TRANSFORMER APPLICATION
Publication Date : 30/12/2020
Unlike conventional line frequency transformer (LFT), solid state transformer (SST) is a power electronic device consisting of one or more converters that are based on semiconductor switches. However, the two-level and three-level voltage source converters (VSCs) used in SST lack scalability to higher voltage levels. This paper proposes a modular multilevel converter (MMC) based SST which allows the output voltage level to be varied without complexing the circuit. The proposed MMC based SST including the control method was validated in a detailed model of MMC with 20 SMs per arm in MATLAB® using Simulink® and PLECS® toolboxes. Experimental results are also presented on a scaled down laboratory prototype which validate the effectiveness of the proposed model. Simulation and experimental results show that multilevel voltage waveform can be conceived by adding more cells to the arms, thus allowing scalability to higher voltage and power levels.
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