Journal ArticleDOI
Classification and Comparative Evaluation of PV Panel-Integrated DC–DC Converter Concepts
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TLDR
Different concepts of PV panel integrated DC-DC converters are presented, comparative evaluation is given and the converter design process is shown for the buck-boost converter which is identified as the best suited concept.Abstract:
The strings of photovoltaic panels have a significantly reduced power output when mismatch between the panels occurs, as, e.g., caused by partial shading. With mismatch, either the panel-integrated diodes are bypassing the shaded panels if the string is operated at the current level of the unshaded panels, or some power of the unshaded panels is lost if the string current is reduced to the level of the shaded panels. With the implementation of dc-dc converters on panel level, the maximum available power can be extracted from each panel regardless of any mismatch. In this paper, different concepts of PV panel-integrated dc-dc converters are presented and their suitability for panel integration is evaluated. The buck-boost converter is identified as the most promising concept and an efficiency/power density ( η- ρ) Pareto optimization of this topology is shown. Based on the optimization results, two 275 W converter prototypes with either Silicon MOSFETs with a switching frequency of 100 kHz or gallium nitride FETs with a switching frequency of 400 kHz are designed for an input voltage range of 15 to 45 V and an output voltage range of 10 to 100 V. The theoretical considerations are verified by efficiency measurements which are compared to the characteristics of a commercial panel-integrated converter.read more
Citations
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An Overview of Recent Research and Emerging PV Converter Technology
TL;DR: An overview of the existing PV energy conversion systems, addressing the system configuration of different PV plants and the PV converter topologies that have found practical applications for grid-connected systems is presented in this paper.
Journal ArticleDOI
Grid-Connected Photovoltaic Systems: An Overview of Recent Research and Emerging PV Converter Technology
TL;DR: An overview of the existing PV energy conversion systems, addressing the system configuration of different PV plants and the PV converter topologies that have found practical applications for grid-connected systems is presented in this article.
Journal ArticleDOI
Dual active bridge based battery charger for plug-in hybrid electric vehicle with charging current containing low frequency ripple
TL;DR: In this paper, the operation of a battery charging system, which is comprised of one Full Bridge (FB) AC-DC stage and one Dual Active Bridge (DAB) DCDC stage, with charging current containing low frequency ripple at two times line frequency, designated as sinusoidal charging is investigated.
Journal ArticleDOI
Model Predictive Control of PV Sources in a Smart DC Distribution System: Maximum Power Point Tracking and Droop Control
TL;DR: In this article, a model predictive control-based maximum power point tracking (MPPT) and model predictive controller-based droop current regulator is presented to interface PV in smart dc distribution systems.
Journal ArticleDOI
A Digital Twin Approach for Fault Diagnosis in Distributed Photovoltaic Systems
TL;DR: A digital twin that estimates the measurable characteristic outputs of a PV energy conversion unit (PVECU) in real time is developed that demonstrates higher fault sensitivity than that of existing approaches.
References
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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
Evaluation of the Main MPPT Techniques for Photovoltaic Applications
M. A. G. de Brito,Luigi Galotto,Leonardo Poltronieri Sampaio,Guilherme de Azevedo e Melo,Carlos A. Canesin +4 more
TL;DR: Evaluations among the most usual maximum power point tracking techniques, doing meaningful comparisons with respect to the amount of energy extracted from the photovoltaic (PV) panel [tracking factor) in relation to the available power, PV voltage ripple, dynamic response, and use of sensors.
Journal ArticleDOI
Cascaded DC-DC converter connection of photovoltaic modules
Geoffrey R. Walker,Paul Sernia +1 more
TL;DR: In this paper, the authors proposed an alternative topology of nonisolated per-panel dc-dc converters connected in series to create a high voltage string connected to a simplified dc-ac inverter.
Proceedings ArticleDOI
Accurate prediction of ferrite core loss with nonsinusoidal waveforms using only Steinmetz parameters
TL;DR: An improved calculation of ferrite core loss for nonsinusoidal waveforms separates a flux trajectory into major and minor loops via a new recursive algorithm that is highly accurate and outperforms two previous methods for measured data.
Journal ArticleDOI
Highly Efficient Single-Phase Transformerless Inverters for Grid-Connected Photovoltaic Systems
TL;DR: This paper will propose a single-phase transformerless inverter circuit being composed of the association of two step-down converters, which is possible to achieve a high level of efficiency and reliability.