An Improved Second-Order Generalized Integrator Based Quadrature Signal Generator

The second-order generalized integrator based quadrature signal generator (SOGI-QSG) is able to produce in-quadrature signals for many applications, such as frequency estimation, grid synchronization, and harmonic extraction. However, the SOGI-QSG is sensitive to input dc and harmonic components wit...

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Bibliographic Details
Published in:IEEE transactions on power electronics 2016-12, Vol.31 (12), p.8068-8073
Main Authors: Zhen Xin, Xiongfei Wang, Zian Qin, Minghui Lu, Poh Chiang Loh, Blaabjerg, Frede
Format: Article
Language:English
Subjects:
Attenuation
Damping
DC offset
Electric currents
Filtering
first-order system
Frequencies
Generators
Harmonic analysis
harmonic attenuation
Power harmonic filters
Power supply
quadrature signal generator
second-order generalized integrator
second-order system
Transfer functions
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Summary:The second-order generalized integrator based quadrature signal generator (SOGI-QSG) is able to produce in-quadrature signals for many applications, such as frequency estimation, grid synchronization, and harmonic extraction. However, the SOGI-QSG is sensitive to input dc and harmonic components with unknown frequencies (e.g., interharmonics). To overcome the drawback, this letter begins by analyzing the dynamic response of SOGI-QSG from the first-order system (FOS) perspective. A second-order SOGI-QSG (SO-SOGI-QSG) with a fourth-order transfer function is then proposed, after referring to the relationship between standard FOS and second-order system. The proposed method is subsequently found to inherit the simplicity of the SOGI-QSG, while demonstrates better disturbance attenuation. Its parameter design procedure is also easy to understand, and can be followed step-by-step without difficulty. Performance of the proposed SO-SOGI-QSG is finally validated by experimental results presented in this letter.
ISSN:0885-8993
1941-0107
DOI:10.1109/TPEL.2016.2576644