An alternative control synthesis for stability enhancement of digital-controlled LCL-filtered grid-connected inverter

Muhammad Talib Faiz, Muhammad Mansoor Khan, Yan Xuhui, Abdar Ali, Yongheng Yang, Saddam Aziz, Ka Hong Loo

Research output: Journal article publicationJournal articleAcademic researchpeer-review

8 Citations (Scopus)

Abstract

In distributed power generation systems, the inherent resonance phenomena of LCL-filtered grid-connected inverter is one of the major challenges faced by the integration of renewable energy resources with the electric power grid. In this context, the capacitor current based multi-loop active damping method is employed due to lossless resonance damping and flexible control design. However, the damping loop with the feedback compensation design suffers from relatively higher parameters sensitivity unless employed with the reduced digital delays. The filter parameters fluctuation causes a shift in resonance frequency, which leads to ineffective damping at the critical resonance frequency and may risk the control loop stability. Therefore, an alternative linear control synthesis is proposed to design the capacitor current damping loop in order to reduce the filter parameters sensitivity. The proposed design realizes the equivalent virtual impedance in an alternative manner to suppress the resonance peak and enhanced the stability characteristics of the grid-connected inverter. A detailed stability and performance analysis have been done to show the widened stable damping region and high parametric robustness of the suggested design as compared to the literature method. Simulations and experimental results are presented to confirm the theoretical findings.

Original languageEnglish
Article number108678
JournalElectric Power Systems Research
Volume213
DOIs
Publication statusPublished - Dec 2022

Keywords

  • Capacitor current damping
  • Distributed power generation system
  • Grid-connected inverter
  • LCL-filter
  • Parallel feedforward compensation

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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