Current harmonics from single-phase grid-connected inverters – examination and suppression

Yang, Y., Zhou, K. and Blaabjerg, F. (2016) Current harmonics from single-phase grid-connected inverters – examination and suppression. IEEE Journal of Emerging and Selected Topics in Power Electronics, 4(1), pp. 221-233. (doi: 10.1109/JESTPE.2015.2504845)

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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 gridconnected 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.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Zhou, Dr Keliang
Authors: Yang, Y., Zhou, K., and Blaabjerg, F.
College/School:College of Science and Engineering > School of Engineering > Systems Power and Energy
Research Group:System Power and Energy
Journal Name:IEEE Journal of Emerging and Selected Topics in Power Electronics
Publisher:Institute of Electrical and Electronics Engineers
Data DOI:10.1109/JESTPE.2015.2504845

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