NDLI: Coordinated control strategy of multi-terminal VSC-HVDC system considering frequency stability and power sharing

Content Provider	IET Digital Library
Author	Liu, Yingpei Xie, Sai Liang, Haiping Cui, Hanyang
Abstract	Aiming at the power sharing among converter stations and the frequency stability of weak AC system connected by converter stations in multi-terminal voltage source converter high-voltage direct current (VSC-HVDC) system, a coordinated control strategy without communication is proposed, which can realise the bidirectional active power support between DC system and weak AC system. The strategy divides the voltage of DC system and the frequency of weak AC system into open-time operation area and time-limited operation area, respectively. When DC voltage and AC frequency are in the open-time operation area, respectively, unbalanced power in the system can be flexibly allocated according to the power margins of converter stations, which reduces DC voltage fluctuation and the influence of DC voltage errors (line length and other factors) among the converter stations on power regulation. When the AC frequency is in the time-limited operation area, the DC system can provide power support for the weak AC system to maintain frequency stability. When the DC voltage is in the time-limited operation area, the weak AC system loses part of the frequency quality to provide short-term power support for the DC system to maintain the stability of VSC-HVDC system as far as possible. The simulation results have verified the feasibility and effectiveness of the proposed control strategy.
Starting Page	5188
Ending Page	5196
Page Count	9
ISSN	17518687
Volume Number	13
e-ISSN	17518695
Issue Number	Issue 22, Nov (2019)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-gtd/13/22
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-gtd.2018.7102
Journal	IET Generation, Transmission & Distribution
Publisher Date	2019-10-15
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	AC Frequency Bidirectional Active Power Support Control of Electric Power System Converter Stations Coordinated Control Strategy D.C. Transmission DC System DC Voltage Error DC Voltage Fluctuation Frequency Stability HVDC Power Converter HVDC Power Transmission Multiterminal Voltage Source Converter High-voltage Multiterminal VSC-HVDC System Open-time Operation Area Power Converter Power Generation Control Power Grid Power Sharing Power Supplies to Apparatus Power System Control Power Transmission Control Time-limited Operation Area Voltage Control Weak AC System
Content Type	Text
Resource Type	Article
Subject	Control and Systems Engineering Energy Engineering and Power Technology Electrical and Electronic Engineering

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