Open AccessSeamless mode transfer control for master–slavemicrogrid
Author(s) -
Chen Jiawei,
Hou Shuaicheng,
Chen Jie
Publication year - 2019
Publication title -
iet power electronics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.637
H-Index - 77
eISSN - 1755-4543
pISSN - 1755-4535
DOI - 10.1049/iet-pel.2018.6286
Subject(s) - islanding , voltage droop , microgrid , inverter , grid , mode (computer interface) , voltage , computer science , control theory (sociology) , control (management) , transfer (computing) , automatic frequency control , engineering , electronic engineering , electrical engineering , distributed generation , telecommunications , voltage source , mathematics , geometry , artificial intelligence , renewable energy , parallel computing , operating system
This study proposes a simple mixeddroop‐ v / f control strategy for the master inverter of a microgrid to achieve seamless modetransfer between grid‐connected and autonomous islanding modes. The proposedcontrol utilises (i) a modified droop control in grid‐connected mode to achieveseamless transfer from grid‐connected mode to islanding mode in case ofintentional and unintentional islanding events, and (ii) v / f controlin islanding mode, which is realised by simply reducing the droop coefficient tozero gradually after islanding, to provide voltage and frequency references tothe slave inverters. Pre‐synchronisation on the voltage and frequency betweenmicrogrid and utility grid is used for the reconnection of them in a seamlessmanner. The rationale and detailed design of the system with the proposedcontrol strategy are elaborated, after which its effectiveness is proved bysimulations and experiments.