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 language | English |
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Pages (from-to) | 4335-4344 |
Number of pages | 10 |
Journal | IEEE Transactions on Power Delivery |
Volume | 37 |
Issue number | 5 |
DOIs | |
Publication status | Published - 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