Open AccessResearch on smooth switching and islanding detection technology for ER system
Author(s) -
Zheng Xuemei,
Cui Tongfei,
Jiang Yuchao,
Cao Hannan
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.2019.0649
Subject(s) - islanding , voltage droop , control theory (sociology) , grid , computer science , voltage , observer (physics) , distributed generation , control (management) , engineering , voltage source , mathematics , electrical engineering , physics , geometry , quantum mechanics , artificial intelligence , renewable energy
For the energy router (ER) switching on/off frequently to select the optimal route, this study mainly solves the problem of on/off‐grid switching and islanding detection of grid‐connected inverters on the AC side of ERs. A control strategy based on disturbance observer is proposed to suppress the disturbance of the output current to the output voltage. At the same time, the improved pre‐synchronisation method is used to achieve fast synchronisation of voltage amplitude and phase. Then, an improved frequency‐shift method is proposed for islanding and non‐detection zone detection for droop control grid‐connected inverters. Finally, the proposed methods are verified by simulation and experiments.