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6. Nonlinear Analysis and Closed-Form Solution for Overhead Line Magnetic Energy Harvester Behavior.

Author

Abramovitz, Alexander, Shwartsas, Moshe, and Kuperman, Alon

Subjects
ENERGY harvesting, MAGNETIC cores, ENERGY development, MAGNETICS, MAGNETIC flux
Abstract

Featured Application: Magnetic energy harvesting of an overhead line. Recently, much attention has been given to the development of various energy harvesting technologies to power remote electronic sensors, data loggers, and communicators that can be installed on smart grid systems. Magnetic energy harvesting is, perhaps, the most straightforward way to capture a significant amount of power from a current-carrying overhead line. Since the harvester is expected to have a small size, the high currents of the distribution system easily saturate its magnetic core. As a result, the operation of the magnetic harvester is highly nonlinear and makes precise analytical modeling difficult. The operation of an overhead line magnetic energy harvester (OLMEH) generating significant DC power output into a constant voltage load was investigated in this paper. The analysis method was based on the Froelich equation to analytically model the nonlinearity of the core's BH characteristic. The main findings of this piecewise nonlinear analysis include a closed-form solution that accounts for both the core and rectifiers' nonlinearities and provides an accurate prediction of OLMEH transfer window length, output current, and harvested power. Continuous and discontinuous operational modes are identified and the mode transition boundary is obtained quantitatively. The theoretical investigation was concluded by comparison with a computer simulation and also verified by the experimental results of a laboratory prototype harvester. A good agreement was found. [ABSTRACT FROM AUTHOR]

Published
2024
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9. Advances in Supercapacitor Technology and Applications.

Author

Kuperman, Alon, Kuperman, Alon, and Lampasi, Alessandro

Subjects
History of engineering & technology
Abstract

Summary: Energy storage is a key topic for research, industry, and business, which is gaining increasing interest. Any available energy-storage technology (batteries, fuel cells, flywheels, and so on) can cover a limited part of the power-energy plane and is characterized by some inherent drawback. Supercapacitors (also known as ultracapacitors, electrochemical capacitors, pseudocapacitors, or double-layer capacitors) feature exceptional capacitance values, creating new scenarios and opportunities in both research and industrial applications, partly because the related market is relatively recent. In practice, supercapacitors can offer a trade-off between the high specific energy of batteries and the high specific power of traditional capacitors. Developments in supercapacitor technology and supporting electronics, combined with reductions in costs, may revolutionize everything from large power systems to consumer electronics. The potential benefits of supercapacitors move from the progresses in the technological processes but can be effective by the availability of the proper tools for testing, modeling, diagnosis, sizing, management and technical-economic analyses. This book collects some of the latest developments in the field of supercapacitors, ranging from new materials to practical applications, such as energy storage, uninterruptible power supplies, smart grids, electrical vehicles, advanced transportation and renewable sources.

10. Advances in Supercapacitor Technology and Applications Ⅱ

Author

Kuperman, Alon, Kuperman, Alon, and Lampasi, Alessandro

Subjects
History of engineering & technology, Technology: general issues, 5-methyl-1,3-dioxolan-4-one, EDLCs, Fourier transform, dimensioning, efficiency, electric traction drives, electrical vehicle, electrospinning, energy allocation, energy storage, energy storage system, equivalent circuit, green supercapacitor, grid code, hybrid energy storage system, internal resistance, ionic liquid, microgrid, non-aqueous electrolytes, perovskite, pullulan, renewable energies, renewable energy, stability, supercapacitor, supercapacitors, sustainable solvents, ultracapacitor, water processable polymer, wave energy
Abstract

Summary: Energy storage is a key topic for research, industry, and business, which is gaining increasing interest. Any available energy-storage technology (batteries, fuel cells, flywheels, and so on) can cover a limited part of the power-energy plane and is characterized by some inherent drawback. Supercapacitors (also known as ultracapacitors, electrochemical capacitors, pseudocapacitors, or double-layer capacitors) feature exceptional capacitance values, creating new scenarios and opportunities in both research and industrial applications, partly because the related market is relatively recent. In practice, supercapacitors can offer a trade-off between the high specific energy of batteries and the high specific power of traditional capacitors. Developments in supercapacitor technology and supporting electronics, combined with reductions in costs, may revolutionize everything from large power systems to consumer electronics. The potential benefits of supercapacitors move from the progresses in the technological processes but can be effective by the availability of the proper tools for testing, modeling, diagnosis, sizing, management and technical-economic analyses. This book collects some of the latest developments in the field of supercapacitors, ranging from new materials to practical applications, such as energy storage, uninterruptible power supplies, smart grids, electrical vehicles, advanced transportation and renewable sources.

11. On the Maximum Power of Passive Magnetic Energy Harvesters Feeding Constant Voltage Loads Under High Primary Currents

Author

Abramovitz, Alexander, Shvartsas, Moshe, and Kuperman, Alon

Abstract

The letter concerns clamped-type magnetic energy harvesters (MEH), supplying power to constant voltage (CV) loads via a diode rectifier. Presented analysis suggests that if primary current magnitude reflected to the secondary side is much higher than core saturation current, then optimal (in terms input MEH power maximization) transfer window length and corresponding load voltage-per-turn ratio become independent of primary current. As a result, certain unique value of load voltage maximizes the power of a given MEH irrespective of primary current magnitude. Moreover, mean magnetic flux path length, B–H curve shape and permeability of the core have no effect on either optimal load voltage-per-turn ratio or maximum harvested power under the above circumstances. Experimental results of MEH capable of harvesting 173 W from a conductor carrying 250 Arms validate the revealed findings.

Published
2024
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37. Unified Control of Three-Level PFC Rectifiers in 3-Wire and 4-Wire Configurations

Author

Schechter, Natan, Baimel, Dmitry, and Kuperman, Alon

Abstract

This article presents a comprehensive analysis of neutral wire disconnection event in active three-phase three-level neutral-point-clamped (NPC) power factor correction (PFC) rectifier operating as front-end of uninterruptible power supply (UPS). It is revealed that upon four-wire to three-wire configuration transition, partial DC link voltages control loops become positive-feedback, yielding operational stability loss. Consequently, it is proposed to reverse partial DC link voltage loop gain polarities (e.g., by swapping the feedback signals) upon the above-mentioned event detection. As a result, partial DC link voltage loops retain negative feedback and stable operation of the system is preserved. The proposed approach was verified experimentally on an off-the-shelf 25 kVA commercial UPS system.

Published
2024
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