Journal ArticleDOI
Single-Stage Doubly Grounded Transformerless PV Grid-Connected Inverter With Boost Function
Zhilei Yao,Zhong Wang +1 more
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TLDR
A cooperative control method among different periods is proposed to reduce processing power of the boost converter and simplify the two-stage system to a single- stage system in each period, so efficiency of the system can be improved.Abstract:
Doubly grounded transformerless grid-connected inverters are widely used in the PV application because of no common mode leakage current. A boost converter should be added into the doubly grounded PV inverters under shading condition to have boost function. However, the inverter with boost capability is a two-stage system and all switches are operated at high frequency, which reduce efficiency of the system. In addition, processing power of the boost converter is high. Therefore, a single-stage doubly grounded transformerless PV grid-connected inverter with boost function is proposed. The proposed inverter consists of two boost and one buck converters. A cooperative control method among different periods is proposed to reduce processing power of the boost converter and simplify the two-stage system to a single-stage system in each period. In addition, only one switch is operated at high frequency in each period, so efficiency of the system can be improved. Operating principle of the proposed inverter is illustrated. Control strategy is designed. Filter design guidelines and example are given. Loss calculation of the proposed inverter is given. Simulation and experimental results of the proposed inverter verify the theoretical analysis. Finally, comparison among other inverters and the proposed inverter is provided.read more
Citations
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Journal ArticleDOI
A Novel Single-Stage Common-Ground Transformerless Buck–Boost Inverter
TL;DR: In this paper , a single-stage transformerless buck-boost inverter is introduced, which can share a common ground between the DC input side and the grid; this leads to having a zero-leakage current.
Journal ArticleDOI
A Single Stage Doubly Grounded Transformerless Inverter Topology With Buck-Boost Voltage Capability for Grid Connected PV Systems
TL;DR: In this article , a single-stage doubly grounded transformerless inverter configuration which can buck-boost the output voltage is proposed in which grid neutral is directly connected to PV panel negative rail which suppresses/eliminates the PV leakage currents.
A Single Stage Doubly Grounded Transformerless Inverter Topology With Buck-Boost Voltage Capability for Grid Connected PV Systems
Phani Kumar Chamarthi,Mohamed Shawky El Moursi,Vinod Khadkikar,Khalifa Al Hosani,Ahmed Al-Durra,Tarek H. M. EL-Fouly +5 more
TL;DR: In this article , a single-stage doubly grounded transformerless inverter configuration which can buck-boost the output voltage is proposed in which grid neutral is directly connected to PV panel negative rail which suppresses/eliminates the PV leakage currents.
Journal ArticleDOI
Topology review of doubly grounded transformer‐less single‐phase inverters
TL;DR: In this paper , the authors compared different topologies of doubly grounded transformer-less single-phase inverters, which can be divided into two categories, that is, hybrid topologies and topologies using energy storage elements.
Journal ArticleDOI
Design of a Half-Bridge Current-Source Inverter Topology for Avionic Systems
Eralp Şener,G. Ertasgin +1 more
TL;DR: In this article , a new half-bridge current-source inverter for avionic systems is proposed, where two 28 V batteries are used as inputs and two high-frequency switches are used to waveshape the positive and negative half-cycles.
References
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Journal ArticleDOI
Transformerless Inverter for Single-Phase Photovoltaic Systems
TL;DR: In this article, the authors proposed a new high-efficiency topology that generates no varying common-mode voltage and requires the same low-input voltage as the bipolar PWM full bridge.
Journal ArticleDOI
Topology Review and Derivation Methodology of Single-Phase Transformerless Photovoltaic Inverters for Leakage Current Suppression
TL;DR: The generation mechanism of leakage current is investigated and the concepts of dc-based and ac-based decoupling networks are proposed to not only cover the published symmetrical inductor-based topologies but also offer an innovative strategy to derive advanced inverters.
Journal ArticleDOI
Eliminating Ground Current in a Transformerless Photovoltaic Application
Oscar Lopez,Francisco D. Freijedo,Alejandro G. Yepes,P. Fernandez-Comesaa,Jano Malvar,Remus Teodorescu,Jesus Doval-Gandoy +6 more
TL;DR: In this paper, the ground current in a 1.5kW PV installation is measured under different conditions and used to build a simulation model, which allows the study of the influence of the harmonics injected by the inverter on the ground currents.
Journal ArticleDOI
H6 Transformerless Full-Bridge PV Grid-Tied Inverters
TL;DR: Experimental results show that the proposed H6 topology and the HERIC achieve similar performance in leakage currents, which is slightly worse than that of the H5 topology, but it features higher efficiency than that that of H5Topology.
Journal ArticleDOI
High Reliability and Efficiency Single-Phase Transformerless Inverter for Grid-Connected Photovoltaic Systems
TL;DR: In this article, a high-reliability single-phase transformerless grid-connected inverter that utilizes superjunction MOSFETs to achieve high efficiency for photovoltaic applications is presented.