Journal ArticleDOI
Leakage Current Analytical Model and Application in Single-Phase Transformerless Photovoltaic Grid-Connected Inverter
Huafeng Xiao,Shaojun Xie +1 more
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TLDR
In this article, the leakage current suppressing method, in which all common-mode paths are considered, has been proposed, and the existing full-bridge and half-bridge type converters have been analyzed by using the developed model and rules, and then, a new fullbridge-type converter structure and a compensation strategy for half-branched inverter have been presented finally.Abstract:
Due to the characteristics of low cost and high efficiency, the transformerless photovoltaic (PV) grid-connected inverters have been popularized in the application of solar electric generation system in residential market. Unfortunately, the leakage current through the stray capacitors between the PV array and the ground is harmful. This paper focuses on the leakage current suppressing method, in which all common-mode paths are considered. First, the common-mode analytical model at switching frequency is developed, and the rules of eliminating switching frequency common-mode source are summarized based on this model. The existing full-bridge- and half-bridge-type converters have been analyzed by using the developed model and rules, and then, a new full-bridge-type converter structure and a compensation strategy for half-bridge-type inverter have been presented finally.read more
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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
Improved Transformerless Inverter With Common-Mode Leakage Current Elimination for a Photovoltaic Grid-Connected Power System
TL;DR: In this article, an improved single-phase inverter topology is presented to eliminate the common-mode leakage current in the transformerless photovoltaic grid-connected system, and the high efficiency and convenient thermal design are achieved thanks to the decoupling of two additional switches connected to the dc side.
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.
Journal ArticleDOI
A Family of Neutral Point Clamped Full-Bridge Topologies for Transformerless Photovoltaic Grid-Tied Inverters
TL;DR: In this paper, two types of basic switching cells, the positive neutral point clamped cell and the negative neutral point clamp cell, are proposed to build transformerless grid-tied PV inverters, with a systematic method of topology generation given.
References
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Journal ArticleDOI
Power-Electronic Systems for the Grid Integration of Renewable Energy Sources: A Survey
Juan Manuel Campos Carrasco,Leopoldo G. Franquelo,Jan T. Bialasiewicz,Eduardo de Teresa Galván,R.C.P. Guisado,Ma.A.M. Prats,Jose I. Leon,Narciso Moreno-Alfonso +7 more
TL;DR: New trends in power electronics for the integration of wind and photovoltaic (PV) power generators are presented and a review of the appropriate storage-system technology used for the Integration of intermittent renewable energy sources is introduced.
Journal ArticleDOI
A review of single-phase grid-connected inverters for photovoltaic modules
TL;DR: In this article, the authors focus on inverter technologies for connecting photovoltaic (PV) modules to a single-phase grid and categorize the inverters into four classifications: 1) the number of power processing stages in cascade; 2) the type of power decoupling between the PV module(s) and the single phase grid; 3) whether they utilizes a transformer (either line or high frequency) or not; and 4) the kind of grid-connected power stage.
Journal ArticleDOI
A Variable Step Size INC MPPT Method for PV Systems
TL;DR: A modified variable step size INC MPPT algorithm is proposed, which automatically adjusts the step size to track the PV array maximum power point and can effectively improve the MPPT speed and accuracy simultaneously.
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
Transformerless Single-Phase Multilevel-Based Photovoltaic Inverter
TL;DR: A new high-efficiency topology for transformerless systems is proposed, which does not generate common-mode currents and topologically guarantees that no dc is injected into the grid and has been verified in a 5-kW prototype with satisfactory results.