NDLI: Strong dynamic interactions between multi-terminal DC network and AC power systems caused by open-loop modal coupling

Content Provider	IET Digital Library
Author	Du, Wenjuan Fu, Qiang Wang, Haifeng
Abstract	This study examines the AC/DC dynamic interactions in an AC power system with an integrated multi-terminal DC network (MTDC) based on a closed-loop interconnected model of the MTDC/AC power system, wherein, the MTDC and the AC system are modelled as two interconnected open-loop subsystems. Analysis in this study indicates that when a complex pole of the open-loop MTDC subsystem is close to an electromechanical oscillation mode (EOM) of concern in the open-loop AC subsystem on the complex plane, this open-loop modal coupling may cause strong dynamic interactions between the MTDC and the AC system. It is very likely that when the open-loop modal coupling occurs, the small-signal stability of the MTDC/AC power system may considerably degrade. In this study, New England test system integrated with an MTDC for wind power transmission is used to demonstrate and validate analysis and conclusions made. Both the master–slave control and the DC voltage droop control for the MTDC are examined. Study cases show that the open-loop modal coupling caused considerable damping degradation of EOM of concern, imposing serious threat to power system small-signal stability.
Starting Page	2362
Ending Page	2374
Page Count	13
ISSN	17518687
Volume Number	11
e-ISSN	17518695
Issue Number	Issue 9, Jun (2017)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-gtd/11/9
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-gtd.2016.1920
Journal	IET Generation, Transmission & Distribution
Publisher Date	2017-03-24
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	AC-DC Dynamic Interaction Closed-loop Interconnected Model Control of Electric Power System DC Voltage Droop Control Electromechanical Oscillation Mode EOM Integrated Multiterminal DC Network Interconnected Open-loop MTDC Subsystem Master–slave Control Modal Analysis MTDC-AC Power System New England Test System Open-loop AC Subsystem Open-loop Modal Coupling Oscillation Power Generation Control Power System Control Power System Economics Power System Interconnection Power System Managemen Power System Operation Power System Small-signal Stability Power System Stability Power Transmission Control Power Transmission, Distribution And Supply Stability in Control Theory Voltage Control Wind Power Plant Wind Power Transmission
Content Type	Text
Resource Type	Article
Subject	Control and Systems Engineering Energy Engineering and Power Technology Electrical and Electronic Engineering

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