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    Grid-voltage-feedforward active damping for grid-connected inverter with LCL filter

    Access Status
    Fulltext not available
    Authors
    Lu, M.
    Wang, X.
    Blaabjerg, F.
    Muyeen, S.M.
    Al-Durra, A.
    Leng, S.
    Date
    2016
    Type
    Conference Paper
    
    Metadata
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    Citation
    Lu, M. and Wang, X. and Blaabjerg, F. and Muyeen, S.M. and Al-Durra, A. and Leng, S. 2016. Grid-voltage-feedforward active damping for grid-connected inverter with LCL filter, in Proceedings of the Applied Power Electronics Conference and Exposition (APEC) conference, Mar 20-24 2016, pp. 1941-1946. Long Beach, CA: IEEE.
    Source Title
    Conference Proceedings - IEEE Applied Power Electronics Conference and Exposition - APEC
    DOI
    10.1109/APEC.2016.7468134
    ISBN
    9781467383936
    School
    Department of Electrical and Computer Engineering
    URI
    http://hdl.handle.net/20.500.11937/21942
    Collection
    • Curtin Research Publications
    Abstract

    For the grid-connected voltage source inverters, the feedforward scheme of grid voltage is commonly adopted to mitigate the current distortion caused by grid background voltages harmonics. This paper investigates the grid-voltage-feedforward active damping for grid connected inverter with LCL filter. It reveals that proportional feedforward control can not only fulfill the mitigation of grid disturbance, but also offer damping effects on the LCL filter resonance. Digital delays are intrinsic to digital controlled inverters; with these delays, the feedforward control can be equivalent to a damping resistor and a reactance paralleled with filter capacitor. The damping performance in different frequency regions are discussed through Bode diagrams. Compared to other widely used active damping strategies, no extra sensor is needed because the Point of Common Coupling (PCC) voltage is sampled for Phase Locked Loop (PLL). Simulation and experiment results are provided for verifying the theoretical analyses.

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