Low-Frequency Common-Mode Voltage Control for Systems Interconnected With Power Converters.

In this paper, an active common-mode (CM) duty cycle injection method is proposed to control the dc and low-frequency CM voltage in grounded systems interconnected by power converters. Specifically, a 380-V dc nanogrid and a single-phase ac distribution system interfaced with a transformerless ac-dc converter is considered. In such architecture, the ac and dc CM quantities are coupled through the ...