An Efficient and Robust Hybrid Damper for LCL- or LLCL-Based Grid-Tied Inverter with Strong Grid-Side Harmonic Voltage Effect Rejection

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

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Author(s)

  • Yuan Liu
  • Weimin Wu
  • Yuanbin He
  • Zhe Lin
  • Frede Blaabjerg

Related Research Unit(s)

Detail(s)

Original languageEnglish
Article number7268896
Pages (from-to)926-936
Journal / PublicationIEEE Transactions on Industrial Electronics
Volume63
Issue number2
Publication statusPublished - 1 Feb 2016

Abstract

A high-order (LCL or LLCL) power filter with a small grid-side inductor is becoming more preferred for a grid-tied inverter due to less total inductance and reduced costs. In a microgrid, the background harmonic voltage (BHV) may distort the injected currents of the grid-tied inverters. In order to resist the effect of the BHV, a feedforward voltage compensator and a proportional resonant regulator with harmonic compensation are often adopted. However, they still have their own limitations, particularly when there are higher order BHVs at the point of common coupling and when the equivalent grid impedance widely varies due to the different numbers of grid-tied inverters in parallel. Thus, an extra damper should be inserted to keep the system stable. In this paper, the control bandwidth limitation of a multiloop control active damping (AD) method is analyzed and illustrated by the capacitor-current-feedback AD. Based on this, a single-loop current control with a hybrid damper is proposed for a single-phase LCL- or LLCL-filter-based grid-tied inverter. A step-by-step design of the controller method is also introduced in detail. Experiments on a 2-kW prototype fully demonstrate the strong robustness of the stability and the high harmonic rejection ability of the inverter using the proposed control method.

Research Area(s)

  • Background harmonic voltage, Grid impedance variation, Harmonic-rejection-ability, LCL-filter, LLCL-filter, Notch filter, RC parallel damper, Robustness, Single-loop

Citation Format(s)

An Efficient and Robust Hybrid Damper for LCL- or LLCL-Based Grid-Tied Inverter with Strong Grid-Side Harmonic Voltage Effect Rejection. / Liu, Yuan; Wu, Weimin; He, Yuanbin; Lin, Zhe; Blaabjerg, Frede; Chung, Henry Shu-Hung.

In: IEEE Transactions on Industrial Electronics, Vol. 63, No. 2, 7268896, 01.02.2016, p. 926-936.

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