An Improved Droop Control Method for VSC- MTDC Considering Power Mismatch Allocation

Converter control of voltage-source-converter multi-terminal DC (VSC-MTDC) grids interconnecting offshore wind farms over long distance is an important research area grabbing much attention in academia and industry. When a converter outage happens in VSC-MTDC grids or the active power injected into...

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Bibliographic Details
Published in2019 4th IEEE Workshop on the Electronic Grid (eGRID) pp. 1 - 6
Main Authors Qian, Yihui, Wang, Zhen, Deng, Yinqiu
Format Conference Proceeding
LanguageEnglish
Published IEEE 01.11.2019
Subjects
droop control
power sharing
Vsc-mtdc
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Summary:Converter control of voltage-source-converter multi-terminal DC (VSC-MTDC) grids interconnecting offshore wind farms over long distance is an important research area grabbing much attention in academia and industry. When a converter outage happens in VSC-MTDC grids or the active power injected into DC grids varies, how to determine the power mismatch allocation is a critical issue. To overcome the problem of inaccurate estimation of power mismatch distribution based on local voltage measurements, this paper proposes an improved droop control method that can establishes a common DC voltage signal across the VSC-MTDC grids. Further, a method to determine the droop constants is also developed. The effectiveness of the proposed control strategy on power sharing of is verified by time-domain simulation studies of a four-terminal VSC-MTDC system in PSCAD/EMTDC.
DOI:10.1109/eGRID48402.2019.9092729