NDLI: Decentralised non-linear I–V droop control to improve current sharing and voltage restoration in DCNG clusters

Content Provider	IET Digital Library
Author	Mosayebi, Mahdi Sadeghzadeh, Seyed Mohammad Khooban, Mohammad Hassan Guerrero, Josep M.
Abstract	This study proposes a new decentralised non-linear I–V droop control to achieve current sharing and voltage restoration for paralleled DC nanogrids (DCNGs) in a cluster. The performance of the conventional droop methods in current sharing among parallel converters degrades due to line impedances. The proposed method improves current sharing among the DCNGs with parallel-connected converters by considering the effect of line impedance, which is an important issue in practical applications. By the proposed method, desired current sharing from the light-load to heavy-load condition is achieved. Since only local information (the output voltage and output current of the DCNGs) is used, the proposed method is fully decentralised, and no communication infrastructure is required, which improves the reliability and stability of the overall system. Furthermore, Lyapunov stability theory is applied to investigate the stability of the proposed method. Additionally, the plug-and-play feature is achieved as an important desired functionality in the DCNGs as well as the proposed method provides scalability and modularity for the DCNGs in a cluster. In the end, theoretical analysis and experimental results validate the effectiveness of the proposed control framework for different scenarios.
Starting Page	248
Ending Page	255
Page Count	8
ISSN	17554535
Volume Number	13
e-ISSN	17554543
Issue Number	Issue 2, Feb (2020)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-pel/13/2
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-pel.2019.0263
Journal	IET Power Electronics
Publisher Date	2019-10-21
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Control of Electric Power System Current Control DC-DC Power Converter DCNGs Decentralised Control Decentralised Nonlinear I-V Droop Control Desired Current Sharing Distributed Power Generation Distribution Network Electric Current Control Invertors Line Impedance Lyapunov Method Lyapunov Stability Theorem Multivariable Control System Nonlinear Control System Output Voltage Parallel-connected Converter Paralleled DC Nanogrids Power Converter Power Distribution Control Power Electronics Power Generation Control Power Supply Stability Stability in Control Theory Supervisory Circuit Voltage Control Voltage Restoration
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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