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Abstract
Environmental conditions and operational modes may significantly impact the distortion level of the injected current from single-phase grid-connected inverter systems, such as photovoltaic (PV) inverters, which may operate in cloudy days with a maximum power point tracking, in a non-unity power factor, or in the low voltage ride through mode with reactive current injection. In this paper, the mechanism of the harmonic current injection from grid-connected single-phase inverter systems is thus explored, and the analysis is conducted on single-phase PV systems. In particular, the analysis is focused on the impacts of the power factor and the feed-in grid current level on the quality of the feed-in grid current from single-phase inverters. As a consequence, an internal model principle based high performance current control solution is tailor-made and developed for single-phase grid-connected systems to produce high quality currents in different operation conditions, where a design procedure is also provided. The developed current controller in this paper can achieve a minimum steady-state error while maintaining a relatively fast transient response, and also being feasible in other single-phase applications as a promising harmonic mitigation solution. Experiments on single-phase grid-connected systems have verified the correctness of the relevant analysis and also the effectiveness of the tailor-made control solution in terms of good harmonic mitigation.
Original language | English |
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Journal | I E E E Journal of Emerging and Selected Topics in Power Electronics |
Volume | 4 |
Issue number | 1 |
Pages (from-to) | 221-233 |
Number of pages | 13 |
ISSN | 2168-6777 |
DOIs | |
Publication status | Published - Mar 2016 |
Keywords
- Harmonics
- Low-voltage ride-through (LVRT)
- Photovoltaic (PV) systems
- Power quality
- Reactive power injection
- Repetitive control (RC)
- Resonant control
- Single-phase inverters
Fingerprint
Dive into the research topics of 'Current Harmonics from Single-Phase Grid-Connected Inverters: Examination and Suppression'. Together they form a unique fingerprint.Projects
- 1 Finished
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PV2GRID: A Next-Generation Grid Side Converter with Advanced Control and Power Quality Capabilities
Blaabjerg, F., Yang, Y. & Sangwongwanich, A.
01/01/2015 → 30/09/2017
Project: Research