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

Xiao, Huangqing; Sun, Kaiqi; Pan, Jiuping; Liu, Yilu

doi:10.1049/iet-gtd.2019.1336

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

Journal Article · Thu Mar 26 00:00:00 EDT 2020 · IET Generation, Transmission, & Distribution

DOI:https://doi.org/10.1049/iet-gtd.2019.1336· OSTI ID:1665962

Xiao, Huangqing ^[1]; Sun, Kaiqi ^[1]; Pan, Jiuping ^[2]; Liu, Yilu ^[1]

Univ. of Tennessee, Knoxville, TN (United States)
ABB Corporate Research Raleigh, NC (United States)

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.

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Research Organization:: Oak Ridge National Lab. (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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