Open AccessFrequency control of droop‐based low‐voltage microgrids with cobweb network topologies
Author(s) -
Yu Chang,
Zhou Hong,
Lu Xiaoqing
Publication year - 2020
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.2020.0151
Subject(s) - microgrid , voltage droop , topology (electrical circuits) , network topology , context (archaeology) , incidence matrix , inverse , computer science , transformation (genetics) , voltage , mathematics , control theory (sociology) , voltage source , control (management) , engineering , computer network , electrical engineering , node (physics) , paleontology , biochemistry , chemistry , geometry , structural engineering , combinatorics , artificial intelligence , gene , biology
When distributed generation (DG) technologies are implemented in an islanded low‐voltage microgrid (LVMG), the topological architecture directly affects the frequency synchronisability. Especially in cases of high DG penetration, the synchronisability of existing traditional topological architectures for LVMGs is very limited. However, a cobweb network topology, which combines the characteristics of several traditional topological architectures, has become a novel alternative for LVMGs. In this context, a compact criterion related to the Moore–Penrose inverse of the incidence matrix for the synchronisability of an LVMG is derived. Then, based on a linear transformation and Moore–Penrose inverse theory, a comparative analysis of the synchronisability of LVMG systems with different topological architectures is presented, the results of which indicate that the synchronisability can be significantly enhanced in a cobweb network topology and that the Braess paradox can also be effectively avoided during the corresponding topological transformation. The effectiveness of the proposed synchronisation criterion is validated based on the Iceland power network, modelled as a cobweb‐based LVMG with large‐scale DG integration, which exhibits excellent sychronisability.