Power flow control with cascaded transformer multilevel converter integrated with energy storage

This paper presents the real and reactive power flow control with cascaded multilevel converter (CMC) in the grid. A distribution static compensator (DSTATCOM) is connected at the point of common coupling (PCC) supported from CMC via cascaded transformers. Instantaneous symmetrical component scheme is used to generate the reference current for the compensator. In multilevel inverter the ramp comparison current control using phase displaced multi-carrier pulse width modulated scheme is used for injecting the current. The battery is connected through bidirectional dc-dc converter to provide support for plugin hybrid electric vehicle (PHEV) charging station. An optimized algorithm has been implemented to control the real and reactive power at the PCC and supply the required power to the charging station through a bidirectional dc-dc converter. To verify the proposed control strategy the simulation studies are carried out using PSCAD/EMTDC software.

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