High efficiency High endurance DC/DC Converter for HVDC application

摘要

The present invention relates to a DC/DC converter for high-efficiency ultra-high voltage direct current transmission that enables efficient conversion by operating and performing direct voltage conversion without using an AC transformer in order to implement a DC power system. _{The first switch element (S 1} ) and the second switch element (S 1) and the second are configured to be connected in series between the (+) terminals of the terminal and form a path to charge and discharge the capacitor module (VCM) by performing an on/off operation during operation of the converter. Switch element (S ₂ ); sequentially connected in series to the node of the first switch element (S ₁ ) and the second switch element (S ₂ ) and the node between the (-) terminal of the high-voltage end and the (-) terminal of the low-voltage end Inductor, capacitor module (VCM) that charges and discharges during the operation of the converter, the third switch element (S ₃ ); The node between the capacitor module (VCM) and the third switch element (S ₃ ) and the (+) of the low voltage terminal A fourth switch element (S ₄ ) connected between the terminals; a first capacitor configured between the (+) terminal and the (-) terminal of the high voltage end and the (+) terminal and the (-) terminal of the low voltage end. It includes a second capacitor.