R. Araneo

R. Araneo
Sapienza University of Rome | la sapienza

Ph.D

About

302
Publications
33,449
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3,630
Citations
Additional affiliations
November 2015 - April 2017
Sapienza University of Rome
Position
  • Professor
January 2004 - present
Sapienza University of Rome
Position
  • Professor (Assistant)

Publications

Publications (302)
Chapter
This paper provides a survey of the basic principles of electromagnetic shielding. It discusses figures of merit for shielding configurations and presents the shielding effectiveness in electrostatics, magnetostatics, and electromagnetics. Starting from the plane wave formulation, advanced concepts about the behavior of stratified media, apertures,...
Article
Introduction The lithium-ion technology has revolutionized the energy storage market and the demand for highly performant devices is rapidly expanding, also capable of satisfying hard/challenging operative conditions required in many technological sectors. For instance, large-scale applications (particularly, deep-water drilling devices, gas/oil in...
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This article revises and updates the electromagnetic compatibility (EMC) challenges commonly encountered in utility-scale grid-connected photovoltaic (PV) systems in light of modern trends. This article examines the issues related to the conductive and radiated radio-frequency disturbances, in the range from 150 kHz to 1 GHz, of multi-MWp PV plants...
Article
A correspondence has been published to comment on the recently published paper “Transient Magnetic Shielding of a Planar Conductive Thin Screen via Exact Image Theory” by Lovat et al. (2023). The correspondence point out an error present in (Lovat et al., 2023) and put the main result of (Lovat et al., 2023) in the context of the (modified) Cagniar...
Conference Paper
This study investigates the impact of the frequency- and current-dependent behavior of concentrated tower grounding systems on the computed fast-front overvoltages across overhead transmission line (OHTL) insulation, the current flowing through line surge arresters (LSAs), and the energy absorbed by LSAs. This investigation is performed via ATP-EMT...
Conference Paper
Full-text available
This study investigates lightning current waveform effects on the fast-front overvoltages and critical currents that cause backflashover of the insulation of a 150 kV overhead line by means of ATP-EMTP simulations, considering frequency- and current-dependent effects of tower grounding systems. Τhe CIGRE waveform is used to simulate negative first...
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The Kingdom of Saudi Arabia is experiencing a surge in electricity demand, with power generation increasing 4 times in 25 years from 1990 to 2014. Despite the abundant primary renewable energy sources, the country has overlooked them in the past in national energy policies. However, in recent years, renewable energy has become a part of the Kingdom...
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The influence of the frequency- and current-dependent response of tower grounding systems on evaluating the backflash over performance of a typical 150 kV overhead transmission line is investigated in this study. This is achieved by adopting different tower grounding system modeling approaches in ATP-EMTP simulations: 1) a simple resistor (constant...
Article
This article reviews floating photovoltaics, mainly on techno-economical, environmental, and O&M issues. Floating PV is a promising technology that is expected to establish a new global market in the near future. Recent years have seen the deployment of an increasing power that exceeded 3 GWp worldwide in 2021, and market analysts expect it will re...
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The exact image theory is here applied to study the transient shielding effectiveness of a canonical shielding configuration, i.e., a small current loop in the presence of a parallel planar thin conductive sheet. In particular, the Green function providing the electromagnetic field produced by a pulsed vertical magnetic dipole in the whole space is...
Conference Paper
Indirect lightning causes power outages along overhead distribution lines. The installation of surge arresters (SAs) at the line towers/poles effectively reduces lightning-induced overvoltages. Among the types of SAs used in practice, nongapped line arresters (NGLAs) have been mainly used in the past for a long time, while externally gapped line ar...
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In this article, the effects of the variable height in overhead power lines are investigated with reference to the surges produced by direct and indirect lightning events. Simulations are carried out both by an implicit finite-difference time-domain scheme and by the commercial tool EMTP-RV. Differences in the waveforms computed by the two approach...
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The magnetic field transmitted through a circular aperture in an infinite magneto-conductive planar screen with finite thickness is studied, considering as a source a circular electric current loop coaxial with the aperture. The field source consists of a circular electric current loop coaxial with the aperture. First, the finite thickness of the a...
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The electromagnetic interaction between a circular disk with finite conductivity and finite thickness and a coaxial circular loop of constant current is addressed here. The finite conductivity and thickness of the material disk lead to the adoption of suitable generalized boundary conditions, and the problem is thereby reduced to the solution of tw...
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The computation of sea/seabed-return distributed parameters of subsea cables is a relevant topic due to the growing importance of submarine connections. This article presents for the first time new formulas for the computation of self and mutual ground impedances and admittances for submarine cables buried in the seabed. The original theory develop...
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Islands are facing significant challenges in meeting their energy needs in a sustainable, affordable, and reliable way. Traditionally, the primary source of electricity on the islands has been imported diesel fuel, with high financial costs for most utilities. In this context, even replacing part of the traditional production with renewable energy...
Article
In recent years the development of LVDC distribution networks is under consideration. DC electrical distributions offer several advantages compared to AC ones in many applications, in particular in the presence of energy storage systems and distributed generation like high efficacy, flexibility and simple integration of renewables. The DC distribut...
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Surface wave technology for high-speed communications is a current research topic aimed to respond to increasing data rate demands on existing copper infrastructures. Also, the topic of surface waves has recently gained importance in the modeling of transmission line towers hit by lightning strikes with spectral content in the megahertz band. The s...
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In recent years, the explosion of renewable energy sources, the increase in the demand for electrical energy, and several improvements in related technologies have fostered research in many relevant areas of interest [...]
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Statistical studies on the electromagnetic field distribution inside metallic cavities date back several decades. Statistical electromagnetics has received a strong boost from the use of reverberation chambers (RCs) and the most important impulse to this approach was given by the diffusion of RCs as test facilities designed to simulate an “expected...
Chapter
Actual shielding configurations present a number of intentional or unintentional apertures: the analysis of the EM field penetration through them is the goal of this chapter devoted mainly to the analysis of arbitrary apertures in planar configurations. Low‐frequency and small‐aperture approximations are presented, as well as the case of multiple a...
Chapter
In this appendix, the focus is on electrostatic shielding. Several electrostatic effects can in fact damage or cause failure in electronic components and assemblies. High‐ speed and high‐density electronic devices are especially vulnerable because of their high static sensitivity. In general, the presence of even a single very static sensitive devi...
Chapter
At low frequencies the magnetic field is due either to the electric current flowing in conductors of various geometries or to the magnetization of surrounding ferromagnetic materials. The classical strategy for reducing quasi‐static magnetic fields in a specific region consists in inserting a shield of appropriate material, whose properties are use...
Chapter
Electromagnetic plane waves are not only the simplest solution of the time‐harmonic Maxwell equations in a homogeneous and source‐free spatial region, but represent also the way to approach the problem of electromagnetic shielding in an efficient and compact methodology. Classical plane‐wave shielding theory is presented with reference to normal/ob...
Chapter
Alternatively, the screen might be designed to reflect the EM field in a given frequency interval only. The screens that are able to perform a frequency discrimination through their reflecting/transmitting properties are known as frequency selective surfaces (FSSs), and basically they work as EM filters. In this chapter, the analysis of periodic st...
Chapter
The design stage is much more difficult than the analysis stage, and shielding does not represent an exception for this rule. The reason is manifold: on one hand, the solution of a shielding design problem is generally not unique, and therefore a number of choices have to be made involving very different aspects, often very far from electromagnetic...
Chapter
This chapter deals with cables having coaxial shields, either solid or braided. Linear materials are considered because nonlinear shields are generally of interest only in very low‐frequency applications. The preliminary problem to be assessed in cable shielding is whether the concern is emission or immunity, since emission or immunity shielding is...
Chapter
In this chapter, adequate figures of merit are introduced for setting up an analysis or design problem and to facilitate the comparison between the performance of different shielding structures, in the frequency domain. Distinction between local and global quantities is thoroughly presented and discussed. Energy‐based and content‐oriented parameter...
Chapter
In this chapter, stratified media are studied in the complex case of excitation by a near‐field source. For simplicity, only the planar case is addressed. A rigorous derivation of the relevant Green functions is provided, adopting the so‐called spectral‐domain approach and equivalent network models for the TM and TE parts of the field. Canonical co...
Chapter
Abstract The formulation of actual shielding problems in mathematical form is the first step of any shielding analysis. In this chapter, the main electromagnetics equations and theorems in both the frequency and time domains are presented for formulating and solving shielding problems in the most convenient way. Basic shielding mechanisms and the r...
Chapter
This chapter provides a short but comprehensive survey of numerical methods that are usually applied to solve electromagnetic shielding problems. The goal is to enable the reader to gain a perspective on the variety of techniques currently available for a shielding investigation. The overview is selective and focused on the basic concepts, features...
Chapter
Although international organizations have produced documents providing recommendations for implementation of EMC requirements, each country has its own recommendations in its national standards, with its set of test instruments, test procedures, and test limits, resulting in differences. In this Appendix the most known standards are briefly listed...
Chapter
In this chapter a systematic investigation of the interaction between an EM field and an enclosure is presented. First, the field characteristics inside uncoupled enclosures (i.e., perfectly conducting EM cavities) are analyzed, then coupling effects (e.g., lossy walls and/or apertures) and small loadings are introduced. In fact, even in the absenc...
Chapter
The choice of adequate components and the selection of the best available installation conditions are key to any successful shielding procedure, and these factors are in strict correlation. Components affect shielding performance, and they can create a discontinuity in the shield integrity; installation conditions are important for both the main sh...
Chapter
Abstract This chapter provides a review of the main electromagnetic properties of materials whose technology is mature enough that they may be considered almost on the shelf. Materials that are still ongoing development or whose present costs discourage widespread use are considered in the last paragraph, in an ever‐changing scenario.
Chapter
Stemming from the key roles that a shielding configuration plays in the protection from a transient electromagnetic threat, possible definitions of time‐domain alternative shielding effectiveness (SE) parameters are presented. Local and global points of view are also discussed. Transient plane waves and transient fields due to pulsed elemental dipo...
Chapter
Some rather uncommon ways of shielding are briefly described in this chapter. They are based on different principles that call for such means as resorting to an active compensation, applying partial shields, or exploiting special material properties.
Article
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Within the policy framework of the energy union strategy started in 2015, the European Union (EU) finalized the “Clean Energy for all Europeans Package” (CEP) in 2019 [...]
Article
The magnetic shielding effectiveness of a single planar screen of infinite extent against a parallel current loop source is evaluated through an analytic closed-form expression which is valid for arbitrarily thick screens and for any source-observation distance. The only assumption in the formulation consists in considering small loops having a con...
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Over the past decade, decarbonization and environmental issues have taken a key role in worldwide politics [...]
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The field penetration through a circular aperture in an infinite plane with a nonzero surface impedance excited by an axially symmetric source is analytically investigated. The problem is formulated in terms of an original dual-integral-equation approach and solved through the method of moments in the Hankel spectral domain. The proposed formulatio...
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Fast-front transients play an important role in the insulation design of any power system. When a stroke hits the shield wire or the tower of high-voltage overhead power lines, flashover may occur either along the span or across tower insulators, depending on the relevant voltages and insulation strength. As a result, backflashover may take place f...
Article
In the present work we assess the lightning performance against direct strokes of overhead distribution lines, making use of the theory of multiconductor transmission lines with periodical grounding, recently developed by the authors. We assume that the lightning protection is provided by shield wires that are placed both above and below (underbuil...
Article
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The ability of shield wires installed in overhead lines to mitigate lightning-induced overvoltages has been extensively investigated. Unfortunately, these studies came to different results, sometimes contradicting each other: some authors found that shield wires produce a significant overvoltage reduction, while others found the reduction negligibl...
Article
In the companion Part I, the theory relevant to the role of shield wires in mitigating lightning-induced overvoltages in overhead lines has been analyzed and clarified. A more consistent meaning has been assigned to the concept of Shielding Factor by introducing two innovations compared to the current literature: the first one concerning the distin...
Article
Accurate tower models for fast transients are essential for the insulation design of overhead lines, since lightning may produce temporary or even permanent faults. The aim of the work is to further investigate the nature of the electromagnetic modes supported by the tower, and on the applicability of the transmission line approaches, originally in...
Book
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A reference to designing and developing electrical systems connected to renewable energies Electrical Safety Engineering of Renewable Energy Systems is an authoritative text that offers an in-depth exploration to the safety challenges of renewable systems. The authors-noted experts on the topic-cover a wide-range of renewable systems including phot...
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Research on corona discharge, shared by physics, chemistry and electrical engineering, has not arrested yet. As a dissipative process, the development of corona increases the resistive losses of transmission lines and enhances the line capacitance locally. Introducing additional losses and propagation delay, along the line, non-linearity and non-un...
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Abstract In this study, the implementation of different corona discharge models in a transient program for overhead multiconductor lines based on the implicit Crank‐Nicolson Finite Difference Time Domain method is presented. Among different corona models available in the literature, two empirical models (Gary's and Suliciu's models) and a physics‐b...
Article
The modern revolutionary changes in power delivery systems with the advent of smart and flexible grids require systems interoperability, seamless integration of technologies and functionalities. This scenario is paving the way to new prospective of energy clusters that call for new methodologies for the dynamic energy management of distributed ener...
Article
This work is devoted to the analysis of voltages produced on overhead distribution lines hit by direct lightning. We will consider arbitrary terminations at both line ends and, also, arbitrary positioning of the pole being struck. We will deal with lines protected by shield wires, placed either above or below the phase conductors. The analytical to...
Article
This work investigates voltages on overhead distribution lines produced by direct strokes, protected by shield wires, placed both above and below phase conductors. An improved formulation based on transfer matrix method and theory of multiconductor transmission lines with periodic grounding allows to eliminate the need of two characteristic wave im...
Article
In this paper, that is an extended version of a work [1] presented at the 2019 International Symposium on Lightning Protection (XV SIPDA), a survey of analytical solutions available in the literature for the evaluation of the lightning-induced voltages in case of both step and linearly rising channel-base currents is presented. Two tools, CiLIV and...
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Full-text available
Here, we propose a new deep learning scheme to solve the energy time series prediction problem. The model implementation is based on the use of Long Short-Term Memory networks and Convolutional Neural Networks. These techniques are combined in such a fashion that interdependencies among several different time series can be exploited and used for fo...