Open AccessUnified decentralised control for both grid‐connected and islanded operation of cascaded‐type microgrid
Author(s) -
Li Lang,
Sun Yao,
Hou Xiaochao,
Su Mei,
Zhang Xin,
Wang Peng,
Guerrero Josep M.
Publication year - 2020
Publication title -
iet renewable power generation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.005
H-Index - 76
eISSN - 1752-1424
pISSN - 1752-1416
DOI - 10.1049/iet-rpg.2019.0990
Subject(s) - microgrid , grid , computer science , control (management) , control theory (sociology) , control engineering , engineering , mathematics , artificial intelligence , geometry
In order to ensure the uninterrupted power supply, it is necessary for the microgrid to operate in both grid‐connected mode and islanded mode. To address this concern, this study proposes a unified decentralised control strategy for both grid‐connected and islanded operation of the cascaded‐type microgrid (CMG). It can realise the smooth mode switching without the need of changing controllers. In terms of the proposed scheme, the system always holds a unique equilibrium point regardless of the grid‐connected or islanded operation. Since the CMG is performed in a decentralised manner without any communication, it is a reliable and cost‐effective solution. Moreover, the self‐synchronisation of each DG is obtained under both the resistance–inductance (RL) and resistance–capacitance (RC) loads. The small‐signal stability is proved and the design of control parameters is given. Finally, the feasibility of the proposed method is verified by simulation and OPAL‐RT‐based real‐time simulation results.