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Control Strategy of MMC-HVDC under Unbalanced Grid Voltage Conditions
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  • Journal title : Journal of Power Electronics
  • Volume 15, Issue 6,  2015, pp.1499-1507
  • Publisher : The Korean Institute of Power Electronics
  • DOI : 10.6113/JPE.2015.15.6.1499
 Title & Authors
Control Strategy of MMC-HVDC under Unbalanced Grid Voltage Conditions
Zhang, Jianpo; Zhao, Chengyong;
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 Abstract
High voltage direct current transmission based on modular multilevel converter (MMC-HVDC) is one of the most promising power transmission technologies. In this study, the mathematical characteristics of MMC-HVDC are analyzed in a synchronous rotational reference frame. A hybrid current vector controller based on proportional integer plus resonant is used to uniformly control the DC and double-base frequency AC currents under unbalanced grid voltage conditions. A corresponding voltage dependent current order limiter is then designed to solve the overcurrent problems that may occur. Moreover, the circulating current sequence components are thoroughly examined and controlled using a developed circulating current suppressor. Simulation results verify the correctness and effectiveness of the proposed control schemes.
 Keywords
Circulating current;HCVC;MMC;VDCOL;
 Language
English
 Cited by
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