Open AccessMaster–slave current regulation of an LCL‐filter‐based grid‐connected inverter under variable grid condition
Author(s) -
He Yuanbin,
Peng Yuqi,
Wang Bangchao,
Hang Lijun
Publication year - 2019
Publication title -
the journal of engineering
Language(s) - English
Resource type - Journals
ISSN - 2051-3305
DOI - 10.1049/joe.2019.0099
Subject(s) - inverter , grid tie inverter , control theory (sociology) , grid , total harmonic distortion , harmonic , computer science , filter (signal processing) , voltage source , voltage , electronic engineering , engineering , electrical engineering , maximum power point tracking , physics , mathematics , control (management) , acoustics , geometry , artificial intelligence
To ease the heavy burden of inverter control, including line current regulation, harmonic current suppression, filter resonance suppression, grid distortion suppression, phase locked loop etc., the study proposes a master–slave current regulation method for an LCL‐filter‐based grid‐connected inverter operating under variable grid condition. The proposed system is composed of a grid‐connected voltage‐source inverter (GC‐VSI) in series with a bidirectional voltage‐source converter (B‐VSC) at the inverter output. The GC‐VSI is responsible for line current regulation, while the B‐VSC takes charge of harmonic current suppression and grid impedance cancellation. Owing to low volt‐ampere of the B‐VSC, the efficiency of the inverter system is not sacrificed. To confirm its validity, a simulation platform with the proposed inverter system has been built. The simulation results demonstrate the performance enhancement of the proposed inverter system operating under different grid conditions.