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Institutional Repository [SANDBOX]
Technical University of Crete
Technical University of Crete
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| URI: | http://purl.tuc.gr/dl/dias/07AA3641-7F87-4850-A2C5-84197AB54BC6 | ||
| Year | 2021 | ||
| Type of Item | Peer-Reviewed Journal Publication | ||
| License |
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| Bibliographic Citation | S. Luo, W. Wu, E. Koutroulis, H. S. -H. Chung and F. Blaabjerg, "A new virtual oscillator control without third-harmonics injection for dc/ac inverter," in IEEE Trans. Power Electron., vol. 36, no. 9, pp. 10879-10888, Sept. 2021, doi: 10.1109/TPEL.2021.3066162. https://doi.org/10.1109/TPEL.2021.3066162 | ||
| Appears in Collections |
Virtual oscillator control (VOC) is a type of nonlinear grid-forming controller for dc/ac inverters. Compared with the droop control method, the original VOC has a faster transient response in islanded mode. However, its output voltage always contains a third-order harmonic, resulting in a significant third-harmonic current, especially in the grid-connected mode. In order to eliminate this harmonic, a notch-type filter is typically employed, but it affects the synchronization speed of multiple dc/ac inverters connected in parallel in an islanded mode. In this article, by analyzing the nonlinear dynamical equations of the oscillator and simplifying its nonlinear current source, a novel VOC for three-phase dc/ac inverters is proposed, which can successfully eliminate the third-order harmonic in the output voltage of the oscillator. Further, compared with the traditional VOC with notch filter, the grid-synchronization response of the proposed VOC-based dc/ac inverters can be significantly improved. A 3-kW/3-phase/120-V experimental prototype system designed on the DSPACE DS1202 platform has been developed to verify the feasibility of the proposed control strategy.
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