An Analysis of Multilevel Converter for Faster Current Control in a DC Microgrid with Extremely Low- Impedance Interconnections

Abstract

Improved power converter configurations and semiconductors innovation capable of driving the required power have emerged in response to the rising global need for energy. It is still a constant endeavour to create semiconductors with greater current or voltage power to propel high power systems. In this way, modern gadgets can handle high voltage or current with ease. Traditional high-voltage semiconductor-based power converter schemes face stiff opposition from innovative medium-voltage device-based alternatives. DC microgrids, with their very limited line impedance, are developing as the upcoming type of small-scale power transmission connections. Due to this phenomenon, even a little change in voltage can create significant currents in microgrids, making quick rapid reaction and accurate power flow regulation essential. In order to provide fast and precise power flow regulation in a dc microgrid, this research employs multi-level converters as the controllers. A multilevel converter allows for a compact output filter. In addition, the final LC filter of a MLC that satisfies a current ripple demand has been designed and is presented in this work. In comparison to traditional two-level converters, we were able to demonstrate that a multi-level converter with a more compact filter may provide high-speed & high-precision power flow regulation under low line impedance situations. Using the simulation results from MATLAB/Simulink, the overall performance of every output current is assessed in the system response, taking into account the transient variations in the power flow.