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A Novel Method to Determine Droop Coefficients of DC Voltage Control for VSC-MTDC System.

Authors :
Li, Bin
Li, Qingquan
Wang, Yizhen
Wen, Weijie
Li, Botong
Xu, Lie
Source :
IEEE Transactions on Power Delivery. Oct2020, Vol. 35 Issue 5, p2196-2211. 16p.
Publication Year :
2020

Abstract

For droop control in voltage source converter based multi-terminal HVDC systems, the determination of droop coefficients is a key issue, which directly affects both power distribution and DC control performances. This paper proposes a novel design of droop coefficients considering the requirements of power distribution, DC voltage control and system stability. Considering the power margins of different converters, the ratio relationship among droop coefficients is established. Converters with larger power margins take bigger portion of power mismatch to avoid overload problem. Furthermore, the integral square error of converters DC voltage is adopted as the DC voltage control performance index, and optimization of droop coefficients to achieve coordinated DC voltage control of steady-state deviation and transient variation, is derived. Finally, the constraint of droop coefficients is established to guarantee the DC system stability after power disturbance. Case studies are conducted on the Nordic 32 system with an embedded 4-terminal DC grid to demonstrate the feasibility and effectiveness of the proposed droop control scheme. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
08858977
Volume :
35
Issue :
5
Database :
Academic Search Index
Journal :
IEEE Transactions on Power Delivery
Publication Type :
Academic Journal
Accession number :
146080056
Full Text :
https://doi.org/10.1109/TPWRD.2019.2963447