PROJECT TITLE :
A Transformer less High-Voltage DC-DC Converter for DC grid Interconnection - 2017
This paper presents a transformerless high-voltage dc-dc converter primarily based on cascaded sub-modules. It's meant for interconnecting high-voltage or medium-voltage dc grids. The proposed dc-dc converter consists of two phase legs, each of which consists of an higher arm and a lower arm with their middle nodes crossly connected through a branch of active sub-modules. By properly controlling the output voltage of the cross-connected branch, a trapezoidal ac current is induced to interact with the ac voltage elements in the upper and lower arm for rebalancing the facility amongst converter arms. The features of modular design, single-stage power conversion, and transformerless structure make the proposed dc-dc converter gain the outstanding merits of wide voltage ratio vary, high system efficiency, and light-weight converter weight. A control theme is also elaborated for guaranteeing the traditional operation of the proposed dc-dc converter. A 100-kV a hundred-MW simulation model performed in MATLAB/Simulink verifies the feasibility of the proposed dc-dc converter. Experimental results obtained from a one hundred-V 1-kW laboratory setup additionally ensure the validation of the proposal.
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