Non-linear Control of the Power Injected Into a Weak Grid by a Self-Synchronized Inverter
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arXiv
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| Main Authors: | , , , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866916429528301568 |
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| author | Jorge, Sebastian Gomez Solsona, Jorge A. Busada, Claudio A. Aguirre-Larrayoz, Leire C. Martínez, M. Itsaso Tapia-Otaegui, Gerardo |
| author_facet | Jorge, Sebastian Gomez Solsona, Jorge A. Busada, Claudio A. Aguirre-Larrayoz, Leire C. Martínez, M. Itsaso Tapia-Otaegui, Gerardo |
| contents | 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2410_07102 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Non-linear Control of the Power Injected Into a Weak Grid by a Self-Synchronized Inverter Jorge, Sebastian Gomez Solsona, Jorge A. Busada, Claudio A. Aguirre-Larrayoz, Leire C. Martínez, M. Itsaso Tapia-Otaegui, Gerardo Systems and Control 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. |
| title | Non-linear Control of the Power Injected Into a Weak Grid by a Self-Synchronized Inverter |
| topic | Systems and Control |
| url | https://arxiv.org/abs/2410.07102 |