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

Abstract

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.

Authors:

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

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+ Show Author Affiliations

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

Publication Date:

2020-03-26

Research Org.:

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Org.:

USDOE

OSTI Identifier:

1665962

Grant/Contract Number:  

AC05-00OR22725

Resource Type:

Accepted Manuscript

Journal Name:

IET Generation, Transmission, & Distribution

Additional Journal Information:

Journal Volume: 14; Journal Issue: 7; Journal ID: ISSN 1751-8687

Publisher:

Institution of Engineering and Technology

Country of Publication:

United States

Language:

English

Subject:

42 ENGINEERING