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

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Weimin Wu
  • Yunjie Sun
  • Min Huang
  • Xiongfei Wang
  • Huai Wang
  • Frede Blaabjerg
  • Marco Liserre

Detail(s)

Original languageEnglish
Article number6583977
Pages (from-to)3279-3289
Journal / PublicationIEEE Transactions on Power Electronics
Volume29
Issue number7
Online published22 Aug 2013
Publication statusPublished - Jul 2014

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. © 1986-2012 IEEE.

Research Area(s)

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

Citation Format(s)

A robust passive damping method for LLCL-filter-based grid-tied inverters to minimize the effect of grid harmonic voltages. / Wu, Weimin; Sun, Yunjie; Huang, Min et al.

In: IEEE Transactions on Power Electronics, Vol. 29, No. 7, 6583977, 07.2014, p. 3279-3289.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review