CONTROLLING THE CURRENT IN A SMALL-SCALE DC MICROGRID REQUIRES THE USE OF A MULTI-LEVEL CONVERTER

Abstract

Multilevel converters are intriguing choices for small-scale DC power networks because they offer the advantages of low switching frequencies and strong harmonic performance. To improve dependability, replicated submodules could also be added to the cascaded converter chain. DC micro grids are emerging as the next generation of small-scale electrical power networks due to their extremely low line impedance. Because this phenomenon creates significant currents in the micro grids even for small voltage changes, a power flow controller must therefore have a rapid transient reaction and accurate power flow management. Multi-level converters are employed as the power flow controllers in this study in order to achieve high speed and high precision power flow management in a dc micro grid. It's possible that the output filter will be small since a multi-level converter is being used. This project also offers the design of an LC filter for the output of a multilevel converter, to meet the need of current ripple. We can verify that in low line impedance scenarios, a multi-level converter with a smaller filter can provide high-speed and high-precision power flow management, as opposed to conventional two-level converters. The control performance of each output current in the step response is evaluated using the results of MATLAB/Simulink simulations, taking into account transient variations in the power flow