Analysis, control and experimental verification of a single-phase capacitive-coupling grid connected inverter

Status	已發表Published
	Analysis, control and experimental verification of a single-phase capacitive-coupling grid connected inverter
	Dai, N. Y.; Zhang, W. C.; Wong, M. C.; Guerrero, J. M.; Lam, C. S.
	2015-05-01
Source Publication	IET Power Electronics
ISSN	1755-4535
Pages	770-782
Abstract	This paper proposes a capacitive-coupling grid-connected inverter (CGCI), which consists of a full bridge single-phase inverter coupled to a power grid via one capacitor in series with an inductor. The fundamental-frequency impedance of the coupling branch is capacitive. In contrast with the conventional inductive-coupling grid-connected inverter (IGCI), this structure provides an alternative interface for use between a low-voltage DC microgrid and an AC grid. A comparison between the CGCI and IGCI is performed. It is concluded that the CGCI is able to transfer active power and provide lagging reactive power at an operational voltage much lower than that of the IGCI. This reduces the system's initial cost and operational losses, as well as the energy stored in the DC-link capacitor. The CGCI has been analyzed and a DC voltage selection method is proposed. Using this method, the DC-link voltage of the CGCI remains at approximately of 50% of the peak grid voltage. In addition, a P-unit current controller is proposed for use with the CGCI, as a proportional-integral controller is not suitable. Finally, simulation and experiments show the effectiveness of the proposed approach.
Keyword	Capacitive-coupling grid connected inverter harmonics reactive power
Language	英語English
The Source to Article	PB_Publication
PUB ID	15020
Document Type	Journal article
Collection	University of Macau
Corresponding Author	Dai, N. Y.
Recommended Citation GB/T 7714	Dai, N. Y.,Zhang, W. C.,Wong, M. C.,et al. Analysis, control and experimental verification of a single-phase capacitive-coupling grid connected inverter[J]. IET Power Electronics, 2015, 770-782.
APA	Dai, N. Y.., Zhang, W. C.., Wong, M. C.., Guerrero, J. M.., & Lam, C. S. (2015). Analysis, control and experimental verification of a single-phase capacitive-coupling grid connected inverter. IET Power Electronics, 770-782.
MLA	Dai, N. Y.,et al."Analysis, control and experimental verification of a single-phase capacitive-coupling grid connected inverter".IET Power Electronics (2015):770-782.

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