Small-signal synchronization stability enhancement of grid-following inverters via a feedback linearization controller

Milad Zarif Mansour, Mohammad Hasan Ravanji, Alireza Karimi, Behrooz Bahrani

Research output: Contribution to journalArticleResearchpeer-review

13 Citations (Scopus)

Abstract

This paper proposes a feedback linearization controller for a grid-following inverter (GFLI) that uses a conventional Phase-Locked Loop (PLL) as the synchronization unit. The proposed controller enhances the GFLI synchronization by expanding the PLL domain of attraction to the whole plane that is limited to a small region around the equilibrium point in a conventional PLL, provided that the grid impedance and voltage are known. Linearizing the overall closed-loop system, the proposed controller provides linear system attributes for the PLL, leading to an infinite domain of attraction and only one equilibrium point. Additionally, a state-feedback controller is integrated within the feedback linearization controller so that it enables the system to have an adjustable dynamic response. Finally, it is shown that the system is robust against parametric uncertainties. The performance of the proposed control design is validated in Matlab/Simulink and experiment. It is verified that the proposed controller expands the domain of attraction and enhances the system dynamic response.

Original languageEnglish
Pages (from-to)4335-4344
Number of pages10
JournalIEEE Transactions on Power Delivery
Volume37
Issue number5
DOIs
Publication statusPublished - Oct 2022

Keywords

  • Domain of Attraction
  • Feedback Linearization
  • Feedback linearization
  • Phase locked loops
  • Phase-Locked Loop
  • Power system stability
  • Stability criteria
  • State Feedback
  • Synchronization
  • Thermal stability
  • Vector Current Control
  • Voltage control

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