Mobile QR Code QR CODE : The Korean Institute of Power Electronics
Title Control of HVDC-MMC Considering the Switching Device’s Current Capacity and Circulating Current under Unbalanced Voltage Conditions
Authors Ji-Woo Moon ; Deuk-Woo Pae ; Jung-Woo Park ; Dea-Wook Kang ; Dong-Wook Yoo ; Jang-Mok Kim
DOI 10.6113/TKPE/2013.18.3.270
Page pp.270-278
ISSN 1229-2214
Keywords modular multilevel converter(MMC); circulating current; unbalance; current limit; high voltage direct current(HVDC)
Abstract This paper proposes a control method for high voltage direct current(HVDC) with modular multilevel converter (MMC) under unbalanced voltage conditions considering the submodule(SM)’s current capacity and circulating current. It is aimed to propose a control method in which the current peak value does not exceed the maximum value of HVDC-MMC by considering the current capacity of the SM under unbalance voltage conditions. And it analyzes the effect of the unbalanced voltage on circulating currents in MMC and then proposes a control method considering each component of circulating currents under unbalanced voltages. The effectiveness of the proposed controlling method is verified through simulation results using PSCAD/EMTDC.