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Title: Operation and control of hybrid HVDC system with LCC and full-bridge MMC connected in parallel

Journal Article · · IET Generation, Transmission, & Distribution
 [1];  [1];  [2];  [1]
  1. Univ. of Tennessee, Knoxville, TN (United States)
  2. ABB Corporate Research Raleigh, NC (United States)
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In this study, a new kind of hybrid high-voltage direct current (HVDC) system is proposed. Each terminal of the proposed system consists of one line commutated converter (LCC) and one full-bridge modular multilevel converter (FB-MMC). The LCC and FB-MMC are connected in parallel so that they can share the same transmission line. The active–reactive power capability of the hybrid HVDC system is extended compared with the conventional LCC-HVDC system, and power reversal control without power interruption can be achieved by the coordination control of LCC and FB-MMC. Besides, the proposed hybrid HVDC system is capable of handling DC fault, because both LCC and FB-MMC have DC fault blocking capability. Moreover, the power rating of FB-MMC can be designed to low value while keeping the bulk-power transmission capability of LCC. A two-terminal bipolar hybrid HVDC system is built in PSCAD/EMTDC. The simulation results verify the effectiveness and feasibility of the proposed hybrid topology and corresponding control strategies.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1665962
Journal Information:
IET Generation, Transmission, & Distribution, Vol. 14, Issue 7; ISSN 1751-8687
Publisher:
Institution of Engineering and TechnologyCopyright Statement
Country of Publication:
United States
Language:
English

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