Capacitive-coupling inverter for PV integration: Analysis and implementation
Zheng,Chen Pei1; Dai,Ning Yi1; Wong,Man Chung1; Wong,Chi Kong1; Zhu,Miao2
Source PublicationProceedings of the 2014 9th IEEE Conference on Industrial Electronics and Applications, ICIEA 2014
AbstractThis paper presents a capacitive-coupling voltage source inverter (VSI) for single-phase grid connected photovoltaic (PV) system, which can achieve active power transfer and reactive power compensation simultaneously. The operation principle of the capacitive-coupling VSI was analyzed and compared with the conventional inductive-coupling VSI. Theoretical study indicates that capacitive-coupling grid-connected VSI can achieve the required power control with lower inverter voltage rating, which reduces the initial cost and operational losses. A single-phase PV integration system with capacitive-coupling VSI is implemented, in which a boost-half-bridge dc-dc converter is used. The boost-half-bridge dc-dc converter is selected due to its low cost, simple control method and high efficiency. The adaptive duty cycle control method for maximum power point tracking (MPPT) is used. The control system of the capacitive-coupling VSI is also implemented, which can transfer the active power from the dc converter to the ac grid and keep the dc-link voltage stable. Simulation results are provided to verify the validity of the capacitive-coupling VSI for PV integration. Comparison with inductive-coupling VSI is also done, which show that the capacitive-coupling VSI is able to transfer the same amount of power with a much lower dc-link voltage.
KeywordCapacitive-coupling voltage source inverter Inductive-coupling voltage source inverter Maximum Power Point Tracking (MPPT)
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Document TypeConference paper
CollectionUniversity of Macau
Affiliation1.Department of Electrical and Computer Engineering, University of Macau,Macao, SAR,Macao
2.Department of Electrical Engineering, State Energy Smart Grid R and D Center, Shanghai Jiao Tong University (SJTU),China
First Author AffilicationUniversity of Macau
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GB/T 7714
Zheng,Chen Pei,Dai,Ning Yi,Wong,Man Chung,et al. Capacitive-coupling inverter for PV integration: Analysis and implementation[C],2014:666-671.
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