Non-linear Control of the Power Injected Into a Weak Grid by a Self-Synchronized Inverter
<|reference_start|>Non-linear Control of the Power Injected Into a Weak Grid by a Self-Synchronized Inverter: In this work, a non-linear controller designed using non-linear transformation linearization and feedback is proposed for an inverter connected to a weak grid through a single-stage inductive filter. The proposed strategy is self-synchronized, so that it is not necessary to have a voltage sensor at the Point of Common Coupling (PCC). The strategy allows to robustify, in the presence of a weak grid, a strategy that has already been demonstrated to allow a significant reduction in the size of the DC-link capacitor of the converter. For this purpose, a state observer is designed that allows estimating the voltage at the PCC from the measurement of the output inductor current. A start-up controller is also included, which allows synchronization even in the case of system start-up. Simulation results are presented for different operating cases, including start-up, normal operation, and grid-voltage sags and swells. In all these cases, it is considered that the exact parameters of the grid to which the inverter is connected are unknown.<|reference_end|>
@article{jorge2024non-linear,
    title={Non-linear Control of the Power Injected Into a Weak Grid by a
  Self-Synchronized Inverter},
    author={Sebastian Gomez Jorge, Jorge A. Solsona, Claudio A. Busada, Leire C.
  Aguirre-Larrayoz, M. Itsaso Mart'inez and Gerardo Tapia-Otaegui},
    journal={arXiv preprint arXiv:2410.07102},
    year={2024},
    archivePrefix={arXiv},
    eprint={2410.07102},
    primaryClass={eess.SY cs.SY}
}