18-STEP BACK-TO-BACK VOLTAGE SOURCE CONVERTER SYSTEM FOR HVDC APPLICATION

摘要

PURPOSE: a kind of back-to-back HVDC voltage source converters systems of 18-step are provided to for independently controlling idle and active power AC system, pass through the output voltage of control and phase. ;CONSTITUTION: AC power is raised and lowered in open Y-Y transformers (160). Auxiliary circuit (150) includes tri-level half-bridge (151) and single-phase transformer (155). First converter and the second converter (110,120) open Y-Y is connected in parallel to be connected in series in transformer and subsidiary loop. ;The 2011 of copyright KIPO submissions