An optimal reactive power control for isolated modular DC/DC converter system

This paper presents an optimal reactive power control in isolated modular DC/DC converter (IMDCC) system based on theoretical and simulated discussions. The system configuration ties two DC grids by using two modular multilevel converters (MMCs) via an AC transformer, which causes the reactive power consuming and will affect the transferrable active power. Then the discussions conclude that the maximum transferrable active power in IMDCC system can be achieved when the reactive power is equally distributed between both MMC stations, which have been ignored by previous research. Finally, the circuit configuration and the control method are described along with simulated and experimental results that verify the effectiveness.