NDLI: Adaptive backstepping droop controller design for multi-terminal high-voltage direct current systems

Content Provider	IET Digital Library
Author	Zhao, Xiaodong Li, Kang
Abstract	Wind power is one of the most developed renewable energy resources worldwide. To integrate offshore wind farms to onshore grids, the high-voltage direct current (HVDC) transmission cables interfaced with voltage source converters (VSCs) are considered to be a better solution than conventional approaches. Proper DC voltage indicates successive power transfer. To connect more than one onshore grid, the DC voltage droop control is one of the most popular methods to share the control burden between different terminals. However, the challenges are that small droop gains will cause voltage deviations, while higher droop gain settings will cause large oscillations. This study aims to enhance the performance of the traditional droop controller by considering the DC cable dynamics. Based on the backstepping control concept, DC cables are modelled with a series of capacitors and inductors. The final droop control law is deduced step-by-step from the original remote side. At each step the control error from the previous step is considered. Simulation results show that both the voltage deviations and oscillations can be effectively reduced using the proposed method. Further, power sharing between different terminals can be effectively simplified such that it correlates linearly with the droop gains, thus enabling simple yet accurate system operation and control.
Starting Page	975
Ending Page	983
Page Count	9
ISSN	17518687
Volume Number	9
e-ISSN	17518695
Issue Number	Issue 10, Jul (2015)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-gtd/9/10
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-gtd.2014.0582
Journal	IET Generation, Transmission & Distribution
Publisher Date	2015-02-05
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Adaptive Backstepping Droop Controller Design Backstepping Control Concept Capacitor Control Error Control of Electric Power System Control System Analysis Control System Synthesis D.C. Transmission DC Cable Dynamics DC Grid DC Voltage DC Voltage Droop Control Droop Control Law Droop Gain Settings HVDC Power Converter HVDC Power Transmission HVDC Transmission Cables Inductor Multiterminal High-voltage Direct Current System Offshore Wind Farm Onshore AC Grid Power Cables Power Sharing Power Transfer Power Transmission Control Renewable Energy ReSource Synthesis Method System Operation Traditional Droop Controller Design Voltage Control Voltage Deviation Voltage Source Converter VSC Wind Power Wind Power Plant
Content Type	Text
Resource Type	Article
Subject	Control and Systems Engineering Energy Engineering and Power Technology Electrical and Electronic Engineering

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