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http://dx.doi.org/10.5370/KIEE.2015.64.2.232

Control Scheme Using Active Power Regulation for DC Voltage of VSC HVDC Under Unbalanced Voltage  

Park, Sang-In (Dept. of Electrical Engineering, Soongsil University)
Huh, Jae-Sun (Dept. of Electrical Engineering, Soongsil University)
Moon, Won-Sik (Dept. of Electrical Engineering, Soongsil University)
Kim, Doo-Hee (Dept. of Electrical Engineering, Soongsil University)
Kim, Jae-Chul (Dept. of Electrical Engineering, Soongsil University)
Publication Information
The Transactions of The Korean Institute of Electrical Engineers / v.64, no.2, 2015 , pp. 232-239 More about this Journal
Abstract
Faced with unbalanced grid operation mode, the high voltage direct current (HVDC) based on voltage source converter (VSC) can be properly controlled by a dual current control scheme. For the modular multilevel converter (MMC) controlling the AC side current is able to limit the arm current which flows along the IGBT of submodule (SM) to rated current. However the limitation of the arm current results in leaving the control range of active power at MMC confined to below the rated capacity. As a result, limiting the arm current causes the problem that the DC side voltage of the HVDC can not be controlled to the reference value since MMC HVDC adjusts the DC side voltage through the active power. In this paper, we propose the algorithm adjusting the active powers of both MMCs to resolve the problem. The back-to-back MMC HVDC applying the algorithm is modeled by PSCAD/EMTDC to verify the algorithm.
Keywords
Voltage source converter (VSC); Modular multilevel converter (MMC); High voltage direct current (HVDC); Unbalanced operation; DC link voltage; Circulating current;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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