Decentralised control method for DC microgrids with improved current sharing accuracy

Publication Type:
Journal Article
Citation:
IET Generation, Transmission and Distribution, 2017, 11 (3), pp. 696 - 706
Issue Date:
2017-02-16
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© The Institution of Engineering and Technology 2016. A decentralised control method that deals with current sharing issues in dc microgrids (MGs) is proposed in thisstudy. The proposed method is formulated in terms of 'modified global indicator' concept, which was originally proposedto improve reactive power sharing in ac MGs. In this work, the 'modified global indicator' concept is extended tocoordinate dc MGs, which aims to preserve the main features offered by decentralised control methods such as no need ofcommunication links, central controller or knowledge of the microgrid topology and parameters. This global indicator isinserted between current and voltage variables by adopting a virtual capacitor, which directly produces an output currentsharing performance that is less relied on mismatches of the multi-bus network. Meanwhile, a voltage stabiliser iscomplementary developed to maintain output voltage magnitude at steady state through a shunt virtual resistance. Theoperation under multiple dc-buses is also included in order to enhance the applicability of the proposed controller. Adetailed mathematical model including the effect of network mismatches is derived for analysis of the stability of theproposed controller. The feasibility and effectiveness of the proposed control strategy are validated by simulation andexperimental results.
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