An Improved Second-Order Generalized Integrator Based Quadrature Signal Generator

Zhen Xin, Xiongfei Wang, Zian Qin, Minghui Lu, Poh Chiang Loh, Frede Blaabjerg

Research output: Contribution to journalJournal articleResearchpeer-review

85 Citations (Scopus)


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.
Original languageEnglish
JournalI E E E Transactions on Power Electronics
Issue number12
Pages (from-to)8068 - 8073
Number of pages6
Publication statusPublished - Dec 2016


  • Quadrature signal generator
  • DC offset
  • First-order system
  • Harmonic attenuation
  • Second-order generalized integrator
  • Second-order system

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