A robust passive damping method for LLCL-filter-based grid-tied inverters to minimize the effect of grid harmonic voltages

Weimin Wu, Yunjie Sun, Min Huang, Xiongfei Wang, Huai Wang, Frede Blaabjerg, Marco Liserre, Henry Shu Hung Chung

    Research output: Contribution to journalArticlepeer-review

    119 Scopus citations

    Abstract

    In order to minimize the effect of the grid harmonic voltages, harmonic compensation is usually adopted for a grid-tied inverter. However, a large variation of the grid inductance challenges the system stability in case a high-order passive filter is used to connect an inverter to the grid. Although in theory, an adaptive controller can solve this problem, but in such a case the grid inductance may need to be detected online, which will complicate the control system. This paper investigates the relationship between the maximum gain of the controller that still keeps the system stable and the Q-factor for a grid-tied inverter with an RL series or an RC parallel damped high-order power filter. Then, a robust passive damping method for LLCL-filter-based grid-tied inverters is proposed, which effectively can suppress the possible resonances even if the grid inductance varies in a wide range. Simulation and experimental results are in good agreement with the theoretical analysis.

    Original languageBritish English
    Article number6583977
    Pages (from-to)3279-3289
    Number of pages11
    JournalIEEE Transactions on Power Electronics
    Volume29
    Issue number7
    DOIs
    StatePublished - Jul 2014

    Keywords

    • $Q$-factor
    • Grid-tied inverter
    • LLCL-filter
    • passive damping
    • RC parallel damper
    • RL series damper
    • robust

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