Power electronic loss models of DC-DC converters in photovoltaic applications

Photovoltaic (PV) energy has been competitive in power generation as an alternative to fossil energy resources over the past decades. The installation of grid-connected solar energy systems is expected to increase rapidly with the fast development of the power electronics technology. As the key to the interface of the PV energy and the grid, power converters should be reliable, efficient and comply with the grid requirements. Considering the nature of PV energy, the power conversion should be flexible (e.g., high step-up DC-DC conversion and harmonic-free DC-AC conversion). Accordingly, many power electronic converters have been reported in literature. Compared with isolated inverters, transformerless inverters show great advantages. This paper thus presents an overview of the transformerless step-up single-phase inverters for PV applications based on the dc-link configurations. Grid-connected PV inverters are classified as constant dc-link voltage structures, pseudo-dc-link voltage structures, pulsating dc-link voltage structures and integrated dc-link voltage structures. The discussion on the composition of different dc-link structures is presented, which provides guidance to select appropriate transformerless inverter topologies for PV applications.

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An Overview into the Effects of Nonlinear Phenomena in Power Electronic Converters for Photovoltaic Applications

2019 IEEE 46th Photovoltaic Specialists Conference (PVSC) ◽

10.1109/pvsc40753.2019.8980933 ◽

2019 ◽

Author(s):

Rachid Darbali-Zamora ◽

Eduardo I. Ortiz-Rivera

Keyword(s):

Nonlinear Phenomena ◽

Power Electronic ◽

Power Electronic Converters ◽

Photovoltaic Applications

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Impact of harmonic distortion on the supraharmonic emission of pulsewidth modulated single-phase power electronic devices

Renewable Energy and Power Quality Journal ◽

10.24084/repqj19.352 ◽

2021 ◽

Vol 19 ◽

pp. 577-582

Author(s):

E. Kaufhold ◽

◽

J. Meyer ◽

P. Schegner

Keyword(s):

Single Phase ◽

Electronic Devices ◽

Harmonic Distortion ◽

Power Electronic ◽

Frequency Range ◽

Pulse Width Modulated ◽

Current State ◽

Photovoltaic Applications ◽

Frequency Coupling ◽

Single Phase Inverter

This study demonstrates the frequency coupling in pulse width modulated (PWM) single-phase converters and inverters. As current state of the art, the harmonic frequency range, e.g. from fundamental frequency up to 2 kHz, is typically assessed separately from the so-called supraharmonic frequency range, i.e. above 2 kHz up to 150 kHz. The frequency coupling between the harmonic and supraharmonic frequency range has not been thoroughly studied and is currently often neglected in the design process as well as for the analysis of the emission of power electronic devices. The aim of this study is to analyse the behaviour of the frequency coupling between the harmonic and the supraharmonic range. In addition, laboratory measurements of a commercially available single-phase inverter for photovoltaic applications are shown to verify the findings.

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Analytical core loss models for electrical steel in power electronic applications

2012 13th International Conference on Optimization of Electrical and Electronic Equipment (OPTIM) ◽

10.1109/optim.2012.6231805 ◽

2012 ◽

Cited By ~ 6

Author(s):

Dennis Kampen ◽

Michael Owzareck ◽

Stefan Beyer ◽

Nejila Parspour ◽

Stefan Schmitt

Keyword(s):

Electrical Steel ◽

Core Loss ◽

Power Electronic ◽

Loss Models

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Formation of high temperature phase in flash-evaporated SnSe films

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100176629 ◽

1990 ◽

Vol 48 (4) ◽

pp. 698-699

Author(s):

J.P.S. Hanjra

Keyword(s):

Thin Films ◽

Electrical Properties ◽

Energy Gap ◽

Dominant Role ◽

Fine Powder ◽

High Temperature Phase ◽

Temperature Phase ◽

Water Mixture ◽

Flash Evaporation ◽

Photovoltaic Applications

Tin mono selenide (SnSe) with an energy gap of about 1 eV is a potential material for photovoltaic applications. Various authors have studied the structure, electronic and photoelectronic properties of thin films of SnSe grown by various deposition techniques. However, for practical photovoltaic junctions the electrical properties of SnSe films need improvement. We have carried out investigations into the properties of flash evaporated SnSe films. In this paper we report our results on the structure, which plays a dominant role on the electrical properties of thin films by TEM, SEM, and electron diffraction (ED).Thin films of SnSe were deposited by flash evaporation of SnSe fine powder prepared from high purity Sn and Se, onto glass, mica and KCl substrates in a vacuum of 2Ø micro Torr. A 15% HF + 2Ø% HNO3 solution was used to detach SnSe film from the glass and mica substrates whereas the film deposited on KCl substrate was floated over an ethanol water mixture by dissolution of KCl. The floating films were picked up on the grids for their EM analysis.

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Ultrahigh Energy Storage Performances of Polymer-based Nanocomposite via Interfaces Engneering

Journal of Materials Chemistry A ◽

10.1039/d0ta10044g ◽

2020 ◽

Author(s):

Peng Wang ◽

Zhongbin Pan ◽

Weilin Wang ◽

Jianxu Hu ◽

Jinjun Liu ◽

...

Keyword(s):

Dielectric Constant ◽

Energy Storage ◽

High Performance ◽

Breakdown Strength ◽

Composite Films ◽

Power Electronic ◽

Ultrahigh Energy

High-performance electrostatic capacitors are in urgent demand owing to the rapidly development of advanced power electronic applications. However, polymer-based composite films with both high breakdown strength (Eb) and dielectric constant...

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