Enhancing Damping in Single-Phase Grid-Forming Virtual Oscillator Control Inverters: A Feedforward Strategy
The expansion of residential distributed generation systems relies heavily on single-phase inverters for grid integration. However, these inverter-based resources compromise grid stability, mainly due to a lack of inertia and grid strength. To address these issues, grid-forming inverters have been d...
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| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
IEEE
2025-01-01
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| Series: | IEEE Open Journal of the Industrial Electronics Society |
| Subjects: | |
| Online Access: | https://ieeexplore.ieee.org/document/11079266/ |
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| Summary: | The expansion of residential distributed generation systems relies heavily on single-phase inverters for grid integration. However, these inverter-based resources compromise grid stability, mainly due to a lack of inertia and grid strength. To address these issues, grid-forming inverters have been developed, with virtual oscillator control (VOC) emerging as a promising approach due to its superior dynamic performance. However, basic VOC-based inverters cannot provide inertial functionality. Attempts to incorporate virtual inertia into VOCs have significantly reduced the damping factor and led to severe dynamic oscillations. This article presents a novel technique to improve the dynamic response of single-phase VOC-based inverters by enhancing damping without affecting the virtual inertia and droop functionalities. The effectiveness of the proposed approach is validated through small-signal analysis and extensive experimental testing on a 2.5 kVA single-phase inverter. The results confirm the small-signal model with well-damped dynamic responses in grid-connected mode, without degrading system inertia during stand-alone operation. |
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| ISSN: | 2644-1284 |