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

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  • Mahdi Mosayebi, Shahed University
  • ,
  • Seyed Mohammad Sadeghzadeh, Shahed University
  • ,
  • Mohammad Hassan Khooban
  • Josep Guerrero, Aalborg University
This paper proposes a new decentralized nonlinear 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 light-load to the heavy-load conditions is achieved. Since only local information (the output voltage and output current of the DCNGs) is used, the proposed method is fully decentralized 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 asthe proposed method provides scalability and modularity for the DCNGs in a cluster. At the end, theoretical analysis and experimental results validate the effectiveness of the proposed control framework for different scenarios.
OriginalsprogEngelsk
TidsskriftIET Power Electronics
Vol/bind13
Nummer2
Sider (fra-til)248 – 255
Antal sider8
ISSN1755-4535
DOI
StatusUdgivet - feb. 2020

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