Small-Signal Synchronization Stability Enhancement of Grid-Following Inverters via a Feedback Linearization Controller

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 li...

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Bibliographic Details
Published in:IEEE transactions on power delivery 2022-10, Vol.37 (5), p.4335-4344
Main Authors: Mansour, Milad Zarif, Ravanji, Mohammad Hasan, Karimi, Alireza, Bahrani, Behrooz
Format: Article
Language:English
Subjects:
Attraction
Control systems
Controllers
Domain of attraction
Domains
Dynamic response
Feedback control
Feedback linearization
Inverters
Phase locked loops
phase-locked loop
Power system stability
Stability criteria
State feedback
Synchronism
Synchronization
Thermal stability
vector current control
Voltage control
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Summary: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.
ISSN:0885-8977
1937-4208
DOI:10.1109/TPWRD.2022.3149842