Open AccessMechanism and elimination of harmonic current injection from single‐phase grid‐connected PWM converters
Author(s) -
Zhou Keliang,
Qiu Zhipeng,
Watson Neville R.,
Liu Yonghe
Publication year - 2013
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.2012.0291
Subject(s) - converters , pulse width modulation , current (fluid) , mechanism (biology) , harmonic , three phase , grid , phase (matter) , computer science , electronic engineering , control theory (sociology) , electrical engineering , voltage , physics , engineering , mathematics , acoustics , geometry , control (management) , quantum mechanics , artificial intelligence
The mechanism of harmonic current injection from single‐phase grid‐connected converters is comprehensively investigated. The measurable impacts from grid voltage, converter commutation, power factor, PWM modulation and control strategy are demonstrated on the harmonic current injection. According to the mechanism, a tailor‐made control solution which employs a low pass voltage‐loop filter and internal model principle‐based hybrid current controller, is proposed to eliminate the harmonic current injection from the single‐phase grid‐connected converters. Experiments are performed to verify the validity of the mechanism and the proposed control method. It not only presents an effective tailor‐made solution to the elimination of harmonic current injection from grid‐connected power converters, but also provides a mechanism‐based benchmark tool to further develop rational grid requirements on the harmonic injection levels in the grid integration of distributed generation units.