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http://dx.doi.org/10.6113/TKPE.2013.18.3.270

Control of HVDC-MMC Considering the Switching Device's Current Capacity and Circulating Current under Unbalanced Voltage Conditions  

Moon, Ji-Woo (Power Conversion & Control Research Center, Korea Electrotechnology Research institute)
Pae, Deuk-Woo (Department of Electrical Engineering, Pusan National University)
Park, Jung-Woo (Power Conversion & Control Research Center, Korea Electrotechnology Research Institute)
Kang, Dea-Wook (Power Conversion & Control Research Center, Korea Electrotechnology Research institute)
Yoo, Dong-Wook (Power Conversion & Control Research Center, Korea Electrotechnology Research Institute)
Kim, Jang-Mok (Department of Electrical Engineering, Pusan National University)
Publication Information
The Transactions of the Korean Institute of Power Electronics / v.18, no.3, 2013 , pp. 270-278 More about this Journal
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.
Keywords
modular multilevel converter(MMC); circulating current; unbalance; current limit; high voltage direct current(HVDC);
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