Frequency adaptive selective harmonic control for grid-connected inverters

Yongheng Yang, Keliang Zhou, Huai Wang, Frede Blaabjerg, Danwei Wang, Bin Zhang

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    153 Scopus citations

    Abstract

    In this paper, a frequency adaptive selective harmonic control (FA-SHC) scheme is proposed. The FA-SHC method is developed from a hybrid SHC scheme based on the internal model principle, which can be designed for grid-connected inverters to optimally mitigate feed-in current harmonics. The hybrid SHC scheme consists of multiple parallel recursive (nk ± m)-order (k = 0, 1, 2,⋯, and m≤n/2 ) harmonic control modules with independent control gains, which can be optimally weighted in accordance with the harmonic distribution. The hybrid SHC, thus, offers an optimal tradeoff among cost, complexity, and also performance in terms of high accuracy, fast response, easy implementation, and compatible design. The analysis and synthesis of the hybrid SHC are addressed. More important, in order to deal with the harmonics in the presence of grid frequency variations, the hybrid SHC is transformed into the FA-SHC, being the proposed fractional-order controller, when it is implemented with a fixed sampling rate. The FA-SHC is implemented by substituting the fractional-order elements with the Lagrange-polynomial-based interpolation filters. The proposed FA-SHC scheme provides fast on-line computation and frequency adaptability to compensate harmonics in grid-connected applications, where the grid frequency is usually varying within a certain range (e.g., 50 ± 0.5 Hz). Experimental tests have demonstrated the effectiveness of the proposed FA-SHC scheme in terms of accurate frequency adaptability and also fast transient response.

    Original languageBritish English
    Article number6868312
    Pages (from-to)3912-3924
    Number of pages13
    JournalIEEE Transactions on Power Electronics
    Volume30
    Issue number7
    DOIs
    StatePublished - 1 Jul 2015

    Keywords

    • Frequency variation
    • grid-connected inverters
    • harmonic control
    • harmonics
    • repetitive control (RC)
    • resonant control (RSC)

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