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Bimodal Transformerless Inverter With Three Switches
IEEE Transactions on Industrial Electronics, 2022The semi-Z-source inverter with least switch count (only two switches) eliminates the leakage current due to the doubly grounded structure. However, the main disadvantage is the high voltage stresses of the switches (the sum of double PV output voltages and the amplitude grid voltage). This paper proposed an improved inverter based on the SZSI.
Yonglu Liu +6 more
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Evaluation of Three-Phase Transformerless DC-Bypass PV Inverters for Leakage Current Reduction [PDF]
IEEE Transactions on Power Electronics, 2020 In transformerless photovoltaic (PV) systems, the leakage current reduction is one of the most important issues. Many interesting single-phase dc-bypass transformerless PV inverters have been proposed for the leakage current reduction, and there is a ...
Frede Blaabjerg +2 more
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An integrated transformerless photovoltaic inverter
IECON 2015 - 41st Annual Conference of the IEEE Industrial Electronics Society, 2015Transformerless inverters are widely used in grid-tied photovoltaic (PV) generation systems, due to the benefits of achieving high efficiency and low cost. The transformerless photovoltaic inverter may generate a leakage current between the inverter and the grid, through a parasitic capacitance.
Jeziel Vázquez +5 more
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Transformerless Topologies for Grid-Connected Single-Phase Photovoltaic Inverters [PDF]
Renewable and Sustainable Energy Reviews, 2011 NOTICE: this is the author’s version of a work that was accepted for publication in . Changes resulting from the publishing process, such as peer review, editing, corrections,structural formatting, and other quality control mechanisms may not be ...
Iván Patrao +2 more
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Synchronverter-based transformerless PV inverters
IECON 2014 - 40th Annual Conference of the IEEE Industrial Electronics Society, 2014In this paper, a transformerless PV inverter is proposed, which is formed by adding a neutral leg into conventional half bridge inverter. It consists of one neutral leg and one inverter leg. The presence of the neutral leg enables the direct connection between the ground of PV panels and the ground. Two main benefits are then obtained.
Wen-Long Ming, Qing-Chang Zhong
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Transformerless audio amplifier
The Journal of the Acoustical Society of America, 1997A transformerless solid state audio amplifier which exhibits the superior linearity and saturation characteristics of a triode vacuum tube amplifier, and which has an output impedance which nominally matches the impedance of a speaker is disclosed in which the gate of a low impedance transistor having triode-like current-voltage I-V characteristics is ...
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Design of Transformerless Modulator-Demodulator
IEEE Journal of Solid-State Circuits, 1967A transformerless modulator-demodulator that operates over a wide range of frequencies is described. The circuit is designed to exhibit symmetrical full wave rectification, to eliminate offset voltages at the output, and to lack the necessity of being fed from a voltage source. The equations to achieve these features are developed. To satisfy all these
N. Freiman, Z. Peled
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DC systems with transformerless converters
IEEE Transactions on Power Delivery, 1995A technical and economic feasibility study of HVDC power systems without power converter transformers is presented. The presentation includes proposed solutions to the drawbacks related to the absence of galvanic separation between the AC and DC power systems, if the power converter transformers are eliminated.
J.J. Vithayathil +2 more
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Transformer or transformerless UPS?
Power Engineer, 2003In this article, the author describes how choosing between a transformer or transformerless UPS for your needs is rather like deciding between a diesel and petrol car. When selecting the right technology to employ, the user has to balance short and long term benefits against budget and overall life cycle costs.
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Transformerless dynamic voltage restorer
IEE Proceedings - Generation, Transmission and Distribution, 2002The feasibility of achieving dynamic voltage restoration without the use of the injection transformer is investigated. The configuration of a proposed transformerless dynamic voltage restorer (DVR) features separate energy storage capacitors for phase-to-phase isolation, cascaded switches/inverters for the voltage boosting functions and a dynamic ...
B.H. Li, S.S. Choi, D.M. Vilathgamuwa
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