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Content Provider | IET Digital Library |
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Author | Dai, Ning Yi Zhang, Wen Chen Wong, Man Chung Guerrero, Josep M. Lam, Chi Seng |
Abstract | This study 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 the 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 analysed 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. |
Starting Page | 770 |
Ending Page | 782 |
Page Count | 13 |
ISSN | 17554535 |
Volume Number | 8 |
e-ISSN | 17554543 |
Issue Number | Issue 5, May (2015) |
Alternate Webpage(s) | https://digital-library.theiet.org/content/journals/iet-pel/8/5 |
Alternate Webpage(s) | https://digital-library.theiet.org/content/journals/10.1049/iet-pel.2014.0373 |
Journal | IET Power Electronics |
Publisher Date | 2015-02-11 |
Access Restriction | Open |
Rights Holder | © The Institution of Engineering and Technology |
Subject Keyword | AC Grid Active Power Transfer Alternative Interface Analysis Verification CGCI Control of Electric Power System Control Verification Cost Reduction Coupling Branch Current Control DC Voltage Selection Method DC-link Voltage Capacitor Distributed Power Generation Electric Current Control Energy Storage Experimental Verification Full-bridge Single-phase Inverter Fundamental-frequency Impedance IGCI Inductive-coupling Grid-connected Inverter Inductor Invertors Lagging Reactive Power Loss Low-voltage DC Microgrid Operational Loss Reduction Operational Voltage Other Power Apparatus And Electric Machine P-unit Current Controller Peak Grid Voltage Power Capacitor Power Grid Power Inductors Proportional-integral Controller Reactive Power Single-phase Capacitive-coupling Grid-connected Inverter System Initial Cost Reduction Transformer And Reactors |
Content Type | Text |
Resource Type | Article |
Subject | Electrical and Electronic Engineering |
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