Design of Filter-Based Stabilizing Control for PLL-Synchronized Converters

Zhixiang Zou, Xingqi Liu, Wu Chen, Giampaolo Buticchi, Xiongfei Wang, Marco Liserre

Research output: Contribution to journalJournal articleResearchpeer-review

3 Citations (Scopus)

Abstract

The phase-locked loop (PLL) has an important effect on the system stability of grid-connected converters in weak grids. In the literature, parameter tuning methods and stabilizing control strategies have been proposed to deal with this problem. However, most of them target at tuning parameters of PLL or mitigating the negative damping as well as the phase lag introduced by the PLL, while the interactions between the PLL and the current control and the cross coupling effects are still not fully explored in the design procedure of stabilizing control. To address this issue, this article extends the study of the interaction between the PLL and the current control using a multiple-input multiple-output (MIMO) model, and then proposes a design criterion of the stabilizing control using design-oriented analysis from the perspective of MIMO impedance model. A category of stabilizing control schemes that uses different types of biquad filters is proposed following the criterion, which not only improves system stability but also removes the coupling between the PLL and the current control according to the sensitivity analysis. Hardware-in-the-loop and experimental results are provided to verify the effectiveness of the proposed control schemes.

Original languageEnglish
JournalIEEE Transactions on Industrial Electronics
Volume71
Issue number11
Pages (from-to)14208-14219
Number of pages12
ISSN0278-0046
DOIs
Publication statusPublished - 2024

Keywords

  • Analytical models
  • Control design
  • Current control
  • Impedance
  • PLL
  • Phase locked loops
  • Power system stability
  • Stability criteria
  • Synchronization
  • phase-locked loop (PLL)-synchronized converter
  • sensitivity analysis
  • stability

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