Open AccessNon‐linear large‐signal stabiliser design for DC micro‐grids
Author(s) -
Azimi Seyed Mohammad,
Hamzeh Mohsen,
Mohamed Yasser AbdelRady I.
Publication year - 2019
Publication title -
iet generation, transmission and distribution
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.92
H-Index - 110
eISSN - 1751-8695
pISSN - 1751-8687
DOI - 10.1049/iet-gtd.2018.5701
Subject(s) - stabiliser , control reconfiguration , direct current , computer science , control theory (sociology) , signal (programming language) , phasor , small signal model , capacitor , electronic engineering , voltage , electric power system , power (physics) , engineering , electrical engineering , control (management) , materials science , physics , embedded system , nanotechnology , programming language , quantum mechanics , artificial intelligence
This study proposes a non‐linear stabiliser to suppress the current/voltage fluctuations of DC micro‐grids (DC‐MGs) caused by large transients. These transients typically occur following a reconfiguration of DC‐MGs, such as disconnection/reconnection of electrical sources, or rearrangement in the structure of DC‐MGs. In the DC‐MG under consideration, a number of the DC sources are implemented in the form of hybrid power conversion systems (HPCSs) consisting of a parallel combination of a super‐capacitor (SC), a fuel cell and a photovoltaic (PV) system. Due to the fast dynamics of the SC units, the stabilisation function of the DC‐MG during transients is performed by these units using a supplementary signal provided by the stabiliser. The proposed stabiliser is intended to operate in a decentralised manner. To this end, a novel Lyapunov function is proposed to adjust the stabiliser parameters based on local data relevant to each HPCS. The control scheme employed is based on a simple structure facilitating the implementation of the proposed stabiliser. Finally, time‐domain simulations are carried out demonstrating the effectiveness of the proposed control framework in a multisource DC‐MG.