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Prof. Dr. Guido Ala
Università degli studi di Palermo - Dipartimento di Ingegneria

Basic Info


Research Keywords & Expertise

0 Computational Electromagnetics
0 Electromagnetic Compatibility
0 EMI
0 Partial discharges
0 Transient electromagnetics

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EMI
Electromagnetic Compatibility
Computational Electromagnetics
grounding systems
Partial discharges

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Short Biography

Guido Ala (Senior Member, IEEE) was born in 1964. He received the “Laurea” degree (M.D.) (magna cum laude) in electrical engineering from the University of Palermo, Italy, in 1989, and the Ph.D. degree in electrical engineering from the Italian MIUR, Rome, Italy, in 1994. From 1992 to 1996, he was a Teacher (permanent staff) of electro-technique with the Italian Technical High Schools. In 1997, he was an Energy Engineer with the Municipal Gas Company, Palermo, Italy. From 1997 to 2004, he was a researcher with the University of Palermo, where he was appointed as an associate professor from 2005 to December 2020, with the Department of Engineering. Since December 2020, he is a full professor in Electrical Engineering at the same Department. His research interests include computational electromagnetics, grounding systems, electromagnetic transients, lightning, electromagnetic compatibility, partial discharge detection, bio-electromagnetic numerical modelling, and electrical analogies in viscoelasticity.

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Journal article
Published: 28 June 2021 in Fusion Engineering and Design
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The paper is focused on the optimal design of Fast Discharge Unit (FDU) for the quench protection of the Toroidal Field (TF) magnets of the Divertor Tokamak Test facility (DTT), an experimental facility under construction in ENEA Frascati Research Centre (Rome, Italy). The FDU is a safety key component that protects the superconducting magnets when a quench is detected through the fast extraction of the energy stored in the magnets by adding a discharge dump resistor (DR) in the TF magnets circuit. A comparison between a fixed DR and a switched variable DR has been implemented by changing resistor parameters and by using multiple current control of the power electronics components (IGCTs). The new configuration allows to reduce the maximum voltage and the thermal stresses both for superconducting magnets and for FDUs (Fast Discharge Units), so reducing the insulation level of all TF (Toroidal Field) coil circuits, including also the power supply, reducing the hotspot temperature on the TF coils and the specific energy through them. Another advantage of the proposed configuration is the reduction of the size of all electrical devices of TF coil circuits so achieving a more effective and reliable design, also decreasing the overall costs.

ACS Style

Carmelo Riccardo Lopes; Pietro Zito; Chiarasole Fiamozzi Zignani; Giuseppe Messina; Luigi Morici; Giordano Tomassetti; Alessandro Lampasi; Guido Ala; Gaetano Zizzo. Design optimization for the quench protection of DTT's superconducting toroidal field magnets. Fusion Engineering and Design 2021, 172, 112748 .

AMA Style

Carmelo Riccardo Lopes, Pietro Zito, Chiarasole Fiamozzi Zignani, Giuseppe Messina, Luigi Morici, Giordano Tomassetti, Alessandro Lampasi, Guido Ala, Gaetano Zizzo. Design optimization for the quench protection of DTT's superconducting toroidal field magnets. Fusion Engineering and Design. 2021; 172 ():112748.

Chicago/Turabian Style

Carmelo Riccardo Lopes; Pietro Zito; Chiarasole Fiamozzi Zignani; Giuseppe Messina; Luigi Morici; Giordano Tomassetti; Alessandro Lampasi; Guido Ala; Gaetano Zizzo. 2021. "Design optimization for the quench protection of DTT's superconducting toroidal field magnets." Fusion Engineering and Design 172, no. : 112748.

Journal article
Published: 29 October 2020 in Energies
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This paper deals with the reliability of the Pulsed Electro-Acoustic (PEA) technique in the case of a specimen containing an air layer. The first approach to this study has been proposed by the authors in previously published works. In these papers, the mathematical description, the PEA cell simulation model, and some experimental tests have been reported. In this work, a more accurate description of the acoustic wave behavior within the PEA cell and specimen with and without an air layer is given. Moreover, the comparison between simulation and experimental tests for both cases (specimen with and without air layer) allowed the validation of the previously developed PEA cell simulation model. The latter was previously validated only for a single layer specimen, here the good performances of the model have also been confirmed in the case of a multilayer specimen, also with an air layer. Experimental and simulation results show that the air layer acts as a barrier for the acoustic signal, due to the different acoustic impedance between the air and the solid dielectric material which constitute the specimen. Therefore, the aim of the present work is to demonstrate that in the case of a three-layers specimen, composed as dielectric-air-dielectric, the PEA cell is not able to provide the complete profile of the entire specimen under test.

ACS Style

Antonino Imburgia; Pietro Romano; Giuseppe Rizzo; Fabio Viola; Guido Ala; George Chen. Reliability of PEA Measurement in Presence of an Air Void Defect. Energies 2020, 13, 5652 .

AMA Style

Antonino Imburgia, Pietro Romano, Giuseppe Rizzo, Fabio Viola, Guido Ala, George Chen. Reliability of PEA Measurement in Presence of an Air Void Defect. Energies. 2020; 13 (21):5652.

Chicago/Turabian Style

Antonino Imburgia; Pietro Romano; Giuseppe Rizzo; Fabio Viola; Guido Ala; George Chen. 2020. "Reliability of PEA Measurement in Presence of an Air Void Defect." Energies 13, no. 21: 5652.

Journal article
Published: 15 September 2020 in Energies
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To date, it has been widespread accepted that the presence of space charge within the dielectric of high voltage direct current (HVDC) cables is one of the most relevant issues that limits the growing diffusion of this technology and its use at higher voltages. One of the reasons that leads to the establishment of space charge within the insulation of cables is the temperature dependence of its conductivity. Many researchers have demonstrated that high temperature drop over the insulation layer can lead to the reversal of the electric field profile. In certain conditions, this can over-stress the insulation during polarity reversal (PR) and transient over voltages (TOV) events accelerating the ageing of the dielectric material. However, the reference standards for the thermal rating of cables are mainly thought for alternating current (AC) cables and do not adequately take into account the effects related to high thermal drops over the insulation. In particular, the difference in temperature between the inner and the outer surfaces of the dielectric can be amplified during load transients or near sections with axially varying external thermal conditions. For the reasons above, this research aims to demonstrate how much the existence of “hot points” in terms of temperature drop can weaken the tightness of an HVDC transmission line. In order to investigate these phenomena, a two-dimensional numerical model has been implemented in time domain. The results obtained for some case studies demonstrate that the maximum electric field within the dielectric of an HVDC cable can be significantly increased in correspondence with variations along the axis of the external heat exchange conditions and/or during load transients. This study can be further developed in order to take into account the combined effect of the described phenomena with other sources of introduction, forming, and accumulation of space charge inside the dielectric layer of HVDC cables.

ACS Style

Giuseppe Rizzo; Pietro Romano; Antonino Imburgia; Fabio Viola; Guido Ala. The Effect of the Axial Heat Transfer on Space Charge Accumulation Phenomena in HVDC Cables. Energies 2020, 13, 4827 .

AMA Style

Giuseppe Rizzo, Pietro Romano, Antonino Imburgia, Fabio Viola, Guido Ala. The Effect of the Axial Heat Transfer on Space Charge Accumulation Phenomena in HVDC Cables. Energies. 2020; 13 (18):4827.

Chicago/Turabian Style

Giuseppe Rizzo; Pietro Romano; Antonino Imburgia; Fabio Viola; Guido Ala. 2020. "The Effect of the Axial Heat Transfer on Space Charge Accumulation Phenomena in HVDC Cables." Energies 13, no. 18: 4827.

Journal article
Published: 17 April 2020 in Energies
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Solar plants suffer of partial shading and mismatch problems. Without considering the generation of hot spots and the resulting security issues, a monitoring system for the health of a PV plant should be useful to drive a dynamic reconfiguration system (DRS) to solve bottlenecks due to different panels’ shading. Over the years different DRS architectures have been proposed, but no suggestions about costs and benefits have been provided. Starting from technical subjects such as differences of the topologies driving the hardware complexity and number of components, this paper identifies the cost of DRS and its lifetime, and based on these issues it provides an economic analysis for a 6 kWp PV plant in different European Union countries, in which the dissimilar incentive policies have been considered.

ACS Style

Giuseppe Schettino; Filippo Pellitteri; Guido Ala; Rosario Miceli; Pietro Romano; Fabio Viola. Dynamic Reconfiguration Systems for PV Plant: Technical and Economic Analysis. Energies 2020, 13, 2004 .

AMA Style

Giuseppe Schettino, Filippo Pellitteri, Guido Ala, Rosario Miceli, Pietro Romano, Fabio Viola. Dynamic Reconfiguration Systems for PV Plant: Technical and Economic Analysis. Energies. 2020; 13 (8):2004.

Chicago/Turabian Style

Giuseppe Schettino; Filippo Pellitteri; Guido Ala; Rosario Miceli; Pietro Romano; Fabio Viola. 2020. "Dynamic Reconfiguration Systems for PV Plant: Technical and Economic Analysis." Energies 13, no. 8: 2004.

Journal article
Published: 04 February 2020 in IEEE Transactions on Industry Applications
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In this paper, the authors discuss the legal liabilities of the professional engineer as both the engineer of record of a project and the construction site manager. In particular, this paper analyzes the case of a fire at the end-user Medium Voltage-Low Voltage (MV-LV) substation of a shopping center in Italy, which occurred a few years after the maintenance works on the electrical installation. The professional engineer who had designed and overseen the construction of the substation was accused of professional negligence. The authors through the examination of applicable technical standards, as well as of safety regulations, demonstrate that the professional engineer had acted diligently and that there was no ground for the negligence charges. The analysis of the substation fire is provided, and the importance of the chain of custody, the chronological documentation, and the secure storing of all the artifacts and fire-damaged evidence is discussed. The authors believe that this paper can be a useful reference for electrical forensics engineers, investigating similar accidents.

ACS Style

Guido Ala; Salvatore Favuzza; Massimo Mitolo; Rossano Musca; Gaetano Zizzo. Forensic Analysis of Fire in a Substation of a Commercial Center. IEEE Transactions on Industry Applications 2020, 56, 3218 -3223.

AMA Style

Guido Ala, Salvatore Favuzza, Massimo Mitolo, Rossano Musca, Gaetano Zizzo. Forensic Analysis of Fire in a Substation of a Commercial Center. IEEE Transactions on Industry Applications. 2020; 56 (3):3218-3223.

Chicago/Turabian Style

Guido Ala; Salvatore Favuzza; Massimo Mitolo; Rossano Musca; Gaetano Zizzo. 2020. "Forensic Analysis of Fire in a Substation of a Commercial Center." IEEE Transactions on Industry Applications 56, no. 3: 3218-3223.

Journal article
Published: 11 January 2020 in Sustainability
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The diffusion of electric vehicles in Italy has started but some complications weight its spread. At present, hybrid technology is the most followed by users, due particularly to socioeconomic factors such as cost of investment and range anxiety. After a deep discussion of the Italian scenario, the aim of the paper is to recognize whether fuel cell technology may be an enabling solution to overcome pollution problems and respect for the environment. The opportunity to use fuel cells to store electric energy is quite fascinating—the charging times will be shortened and heavy passenger transport should be effortless challenged. On the basis of the present history and by investigating the available information, this work reports the current e-mobility state in Italy and forecasts the cities in which a fuel cell charging infrastructure should be more profitable, with the intention of granting a measured outlook on the plausible development of this actual niche market.

ACS Style

Guido Ala; Gabriella Di Filippo; Fabio Viola; Graziella Giglia; Antonino Imburgia; Pietro Romano; Vincenzo Castiglia; Filippo Pellitteri; Giuseppe Schettino; Rosario Miceli. Different Scenarios of Electric Mobility: Current Situation and Possible Future Developments of Fuel Cell Vehicles in Italy. Sustainability 2020, 12, 564 .

AMA Style

Guido Ala, Gabriella Di Filippo, Fabio Viola, Graziella Giglia, Antonino Imburgia, Pietro Romano, Vincenzo Castiglia, Filippo Pellitteri, Giuseppe Schettino, Rosario Miceli. Different Scenarios of Electric Mobility: Current Situation and Possible Future Developments of Fuel Cell Vehicles in Italy. Sustainability. 2020; 12 (2):564.

Chicago/Turabian Style

Guido Ala; Gabriella Di Filippo; Fabio Viola; Graziella Giglia; Antonino Imburgia; Pietro Romano; Vincenzo Castiglia; Filippo Pellitteri; Giuseppe Schettino; Rosario Miceli. 2020. "Different Scenarios of Electric Mobility: Current Situation and Possible Future Developments of Fuel Cell Vehicles in Italy." Sustainability 12, no. 2: 564.

Journal article
Published: 27 November 2019 in Energies
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This work presents the design, simulation, and experimental validation of new B-Spline-based modulation techniques applied to a Multilevel Power Inverter (MPI), particularly focusing the attention on the harmonic content of the output voltages of the inverter. Simulation and experimental results are proposed and discussed, mainly describing the potential benefits, such as the increase of the multi-level operation of the converter, and drawbacks (low-order harmonics) related to the adoption of B-Spline functions for multilevel inverters applied in the field of electrical drives.

ACS Style

Giuseppe Schettino; Guido Ala; Massimo Caruso; Vincenzo Castiglia; Filippo Pellitteri; Marco Trapanese; Fabio Viola; Rosario Miceli. Experimental Study on B-Spline-Based Modulation Schemes Applied in Multilevel Inverters for Electric Drive Applications. Energies 2019, 12, 4521 .

AMA Style

Giuseppe Schettino, Guido Ala, Massimo Caruso, Vincenzo Castiglia, Filippo Pellitteri, Marco Trapanese, Fabio Viola, Rosario Miceli. Experimental Study on B-Spline-Based Modulation Schemes Applied in Multilevel Inverters for Electric Drive Applications. Energies. 2019; 12 (23):4521.

Chicago/Turabian Style

Giuseppe Schettino; Guido Ala; Massimo Caruso; Vincenzo Castiglia; Filippo Pellitteri; Marco Trapanese; Fabio Viola; Rosario Miceli. 2019. "Experimental Study on B-Spline-Based Modulation Schemes Applied in Multilevel Inverters for Electric Drive Applications." Energies 12, no. 23: 4521.

Journal article
Published: 02 November 2019 in Energies
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Cable manufacturing industries are constantly trying to improve the electrical performance of power cables. During the years, it was found that one of the most relevant degradation factors influencing the cable lifetime is the presence of space charge in the insulation layer. To detect the accumulated charge, the pulsed electro-acoustic (PEA) method is the most used technique. Despite the wide use of the PEA cell, several issues are still present. In particular, the PEA output signal is strongly disturbed by the acoustic waves reflections within the PEA cell. This causes the distortion of the output signal and therefore the misinterpretation of the charge profiles. This, in turn, may result in an incorrect cable characterization from the space charge phenomenon point of view. In 2017, due to the proved degradation effect of the space charge accumulation phenomenon, the IEEE Std 1732 was developed. This standard describes the steps to be followed for the space charge measurement in cables specimens during pre-qualification or type tests. Therefore, cable manufacturing industries started to take a particular interest in these measures. In the light of this, the aim of the present work is to highlight that the enacted standard is not easily applicable since various problems are still present in the PEA method for cables. In particular, in this work, the effect of multiple reflected signals due to the different interfaces involved, but also the effect of the signal attenuation due to cable dielectric thickness, as well as the effect of the PEA cell ground electrode thickness in the output charge profile, are reported. These issues have been demonstrated by means of an experimental test carried out on a full-size cable in the Prysmian Group High Voltage laboratory. To better understand the PEA cell output signal formation, a PEA cell model was developed in a previous work and it has been experimentally validated here. In particular, simulations have been useful to highlight the effect of the reflection phenomena due to the PEA cell ground electrode thickness on the basis of the specimen under test features. Moreover, by analyzing the simulation results, it was possible to separate the main signal from the reflected waves and, in turn, to calculate the suitable ground electrode thickness for the cable specimen under test.

ACS Style

Antonino Imburgia; Pietro Romano; George Chen; Giuseppe Rizzo; Eleonora Riva Sanseverino; Fabio Viola; Guido Ala. The Industrial Applicability of PEA Space Charge Measurements, for Performance Optimization of HVDC Power Cables. Energies 2019, 12, 4186 .

AMA Style

Antonino Imburgia, Pietro Romano, George Chen, Giuseppe Rizzo, Eleonora Riva Sanseverino, Fabio Viola, Guido Ala. The Industrial Applicability of PEA Space Charge Measurements, for Performance Optimization of HVDC Power Cables. Energies. 2019; 12 (21):4186.

Chicago/Turabian Style

Antonino Imburgia; Pietro Romano; George Chen; Giuseppe Rizzo; Eleonora Riva Sanseverino; Fabio Viola; Guido Ala. 2019. "The Industrial Applicability of PEA Space Charge Measurements, for Performance Optimization of HVDC Power Cables." Energies 12, no. 21: 4186.

Review
Published: 12 September 2019 in Energies
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This review takes into account articles and standards published in recent years concerning the application of the Pulsed Electro Acoustic (PEA) method for space charge measurement on High Voltage Direct Current (HVDC) cables and mini-cables. Since the 80s, the PEA method has been implemented for space charge measurements on flat specimens in order to investigate space charge phenomena and to evaluate the ageing of dielectrics. In recent years, this technique has been adapted to cylindrical geometry. Several studies and experiments have been carried out on the use of the PEA method for full size cables and HVDC cable models. The experiments have been conducted using different arrangements of the measurement setup and focusing attention on different aspects of space charge phenomena. In this work, the importance of space charge measurement is highlighted and the state-of-the-art PEA method application to full size cables and mini-cables is described. The main aim of this paper is to offer a complete and current review of this technique. In addition, limits on the use of PEA method are examined and main possible directions of research are proposed in order to improve the applicability, reliability, and replicability of this method.

ACS Style

Giuseppe Rizzo; Pietro Romano; Antonino Imburgia; Guido Ala. Review of the PEA Method for Space Charge Measurements on HVDC Cables and Mini-Cables. Energies 2019, 12, 3512 .

AMA Style

Giuseppe Rizzo, Pietro Romano, Antonino Imburgia, Guido Ala. Review of the PEA Method for Space Charge Measurements on HVDC Cables and Mini-Cables. Energies. 2019; 12 (18):3512.

Chicago/Turabian Style

Giuseppe Rizzo; Pietro Romano; Antonino Imburgia; Guido Ala. 2019. "Review of the PEA Method for Space Charge Measurements on HVDC Cables and Mini-Cables." Energies 12, no. 18: 3512.

Conference paper
Published: 01 September 2019 in 2019 IEEE 5th International forum on Research and Technology for Society and Industry (RTSI)
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The decarbonizing process of the transportation system and the spread of unplanned renewables energy source, such as photovoltaic and wind energies, brought the constant need of ever more efficient energy storage technologies. Among these technologies, batteries, particularly the li-ion chemistry, are widely used in automotive and energy storage applications. For an optimized management of the cell it is advisable to have models that can accurately describe cell behaviour. In this paper a battery model for performance simulation in automotive application is identified. The main shapes of battery cells with their own advantages and disadvantages are shown, and a roundup of the best available 18650 cells is given. Finally, a test-bench for the parameter estimation of the cells is implemented.

ACS Style

V. Castiglia; R. Miceli; Guido Ala; P. Romano; F. Viola; G. Giglia; A. Imburgia; G. Schettino. Modelling, simulation and characterization of Li-Ion battery cell. 2019 IEEE 5th International forum on Research and Technology for Society and Industry (RTSI) 2019, 400 -405.

AMA Style

V. Castiglia, R. Miceli, Guido Ala, P. Romano, F. Viola, G. Giglia, A. Imburgia, G. Schettino. Modelling, simulation and characterization of Li-Ion battery cell. 2019 IEEE 5th International forum on Research and Technology for Society and Industry (RTSI). 2019; ():400-405.

Chicago/Turabian Style

V. Castiglia; R. Miceli; Guido Ala; P. Romano; F. Viola; G. Giglia; A. Imburgia; G. Schettino. 2019. "Modelling, simulation and characterization of Li-Ion battery cell." 2019 IEEE 5th International forum on Research and Technology for Society and Industry (RTSI) , no. : 400-405.

Conference paper
Published: 01 September 2019 in 2019 IEEE 5th International forum on Research and Technology for Society and Industry (RTSI)
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Partial discharge (PD) activity in the insulation system of an electrical equipment can determine the failure of the whole apparatus. PD sensors are widely used in high-voltage electrical systems as the main elements of a detecting system oriented to real time monitoring. Recently, non-invasive sensors have been proposed in industrial applications for cable and other sensitive electrical parts: they are based both on capacitive and on the electromagnetic radiating coupling. In order to assess the real performance of a new sensor produced by a high voltage AC cables manufacturer, the paper proposes electromagnetic fullwave simulation results.

ACS Style

G. Giglia; Guido Ala; V. Castiglia; A. Imburgia; R. Miceli; Giuseppe Rizzo; P. Romano; G. Schettino; F. Viola. Electromagnetic Full-Wave Simulation of Partial Discharge Detection in High Voltage AC Cables. 2019 IEEE 5th International forum on Research and Technology for Society and Industry (RTSI) 2019, 166 -171.

AMA Style

G. Giglia, Guido Ala, V. Castiglia, A. Imburgia, R. Miceli, Giuseppe Rizzo, P. Romano, G. Schettino, F. Viola. Electromagnetic Full-Wave Simulation of Partial Discharge Detection in High Voltage AC Cables. 2019 IEEE 5th International forum on Research and Technology for Society and Industry (RTSI). 2019; ():166-171.

Chicago/Turabian Style

G. Giglia; Guido Ala; V. Castiglia; A. Imburgia; R. Miceli; Giuseppe Rizzo; P. Romano; G. Schettino; F. Viola. 2019. "Electromagnetic Full-Wave Simulation of Partial Discharge Detection in High Voltage AC Cables." 2019 IEEE 5th International forum on Research and Technology for Society and Industry (RTSI) , no. : 166-171.

Conference paper
Published: 01 September 2019 in 2019 IEEE 5th International forum on Research and Technology for Society and Industry (RTSI)
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The use of a discrete passive filter is the most attractive solution for EMI reduction in power conversion systems. This is due to its simplicity of concept and efficiency in the frequency range up to tens of megahertz and over. The common mode and differential mode sections of the EMI filter contain capacitors and soft magnetic chokes and, when they are used in the transportation context, their design has to satisfy further constraints in terms of low weight, low volume, low losses and low cost in adjoint to filtering efficiency. In this framework the authors, by using an EMI filter design procedure already setup by themselves, investigate, also with an experimental setup, the possibility of evaluating the performance of the soft ferrite components, from the losses point of view.

ACS Style

Guido Ala; A. G. Giglia; A. Imburgia; R. Miceli; Giuseppe Rizzo; P. Romano; F. Viola; Simone Quondam Antonio; Hari Prasad Rimal. Design of Soft Ferrite filters for EMI reduction in Power Conversion Systems. 2019 IEEE 5th International forum on Research and Technology for Society and Industry (RTSI) 2019, 394 -399.

AMA Style

Guido Ala, A. G. Giglia, A. Imburgia, R. Miceli, Giuseppe Rizzo, P. Romano, F. Viola, Simone Quondam Antonio, Hari Prasad Rimal. Design of Soft Ferrite filters for EMI reduction in Power Conversion Systems. 2019 IEEE 5th International forum on Research and Technology for Society and Industry (RTSI). 2019; ():394-399.

Chicago/Turabian Style

Guido Ala; A. G. Giglia; A. Imburgia; R. Miceli; Giuseppe Rizzo; P. Romano; F. Viola; Simone Quondam Antonio; Hari Prasad Rimal. 2019. "Design of Soft Ferrite filters for EMI reduction in Power Conversion Systems." 2019 IEEE 5th International forum on Research and Technology for Society and Industry (RTSI) , no. : 394-399.

Journal article
Published: 31 July 2019 in Photonics
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The sustainable development of our planet is considerably related to a relevant reduction of CO2 global emissions, with building consumption contributing more than 40%. In this scenario, new technological conceptions, such as building-integrated photovoltaic technology, emerged in order to satisfy the requirements of sustainability imposed by the European Union. Therefore, the aim of this work is to provide a technical and economical comparison of the performances of different vertical-mounted innovative photovoltaic systems, potentially integrated on a building instead of on traditional windows or glass walls. The proposed investigation was carried out by means of experimental tests on three different next-generation vertical structures. The related results are described and discussed, highlighting the advantages and the drawbacks of the proposed technologies.

ACS Style

Gianluca Acciari; Gabriele Adamo; Guido Ala; Alessandro Busacca; Massimo Caruso; Graziella Giglia; Antonino Imburgia; Patrizia Livreri; Rosario Miceli; Antonino Parisi; Filippo Pellitteri; Riccardo Pernice; Pietro Romano; Giuseppe Schettino; Fabio Viola. Experimental Investigation on the Performances of Innovative PV Vertical Structures. Photonics 2019, 6, 86 .

AMA Style

Gianluca Acciari, Gabriele Adamo, Guido Ala, Alessandro Busacca, Massimo Caruso, Graziella Giglia, Antonino Imburgia, Patrizia Livreri, Rosario Miceli, Antonino Parisi, Filippo Pellitteri, Riccardo Pernice, Pietro Romano, Giuseppe Schettino, Fabio Viola. Experimental Investigation on the Performances of Innovative PV Vertical Structures. Photonics. 2019; 6 (3):86.

Chicago/Turabian Style

Gianluca Acciari; Gabriele Adamo; Guido Ala; Alessandro Busacca; Massimo Caruso; Graziella Giglia; Antonino Imburgia; Patrizia Livreri; Rosario Miceli; Antonino Parisi; Filippo Pellitteri; Riccardo Pernice; Pietro Romano; Giuseppe Schettino; Fabio Viola. 2019. "Experimental Investigation on the Performances of Innovative PV Vertical Structures." Photonics 6, no. 3: 86.

Proceedings article
Published: 24 July 2019 in CENTRAL EUROPEAN SYMPOSIUM ON THERMOPHYSICS 2019 (CEST)
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In this paper we refer to the computational issues in solving Maxwell’s curl equations without using any connectivity among the points in which the problem domain is discretized. The adopted procedure is able to approximate the electric and magnetic vector fields making use of the derivatives of a kernel function at points arranged in the computational domain. In order to improve the numerical accuracy a suitable strategy is considered. The computational core of the overall process requires elementary linear algebra operations. In the paper the method is presented and the discussion is addressed to the computational issues. Moreover, some numerical simulations are presented to validate the numerical process.

ACS Style

Elisa Francomano; Guido Ala; Graziella Giglia; Marta Paliaga. Computational issues of an electromagnetics transient meshless method. CENTRAL EUROPEAN SYMPOSIUM ON THERMOPHYSICS 2019 (CEST) 2019, 2116, 450066 .

AMA Style

Elisa Francomano, Guido Ala, Graziella Giglia, Marta Paliaga. Computational issues of an electromagnetics transient meshless method. CENTRAL EUROPEAN SYMPOSIUM ON THERMOPHYSICS 2019 (CEST). 2019; 2116 (1):450066.

Chicago/Turabian Style

Elisa Francomano; Guido Ala; Graziella Giglia; Marta Paliaga. 2019. "Computational issues of an electromagnetics transient meshless method." CENTRAL EUROPEAN SYMPOSIUM ON THERMOPHYSICS 2019 (CEST) 2116, no. 1: 450066.

Journal article
Published: 09 July 2019 in IEEE Transactions on Industry Applications
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In the field of high voltage transmission systems, different degradation phenomena affect the reliability of the employed components. In particular, under DC stress, the space charge accumulation phenomenon is believed the most responsible of the dielectrics lifetime reduction. To measure the accumulated space charges in flat specimens, the PEA method is one of the most used techniques. The working principle of the PEA cell is based on the acoustic waves propagation and detection. As is well known, the acoustic waves propagating in different means are partially transmitted and partially reflected. Therefore, the piezoelectric sensor of the PEA cell is subjected of both direct and reflected waves. The latter, which are also present in the PEA cell output signal, if are not taken into account could be easily confused as a charge accumulation. For this reason, in this work the acoustic waves behavior within the PEA cell has been simulated in order to avoid incorrect interpretation of the PEA cell output charge profiles. In this paper, compared to other works present in literature in which only the surface charges were considered, the space charges accumulated in the insulation bulk are also considered for a complete analysis of the waves behavior during the PEA measures. The results found in the present work are very useful for cables manufacturing industries in which the choice of the dielectric materials is strongly influenced by the space charge accumulation phenomenon.

ACS Style

Antonino Imburgia; Pietro Romano; Guido Ala; Eleonora Riva Sanseverino; Graziella Giglia. The Role of Right Interpretation of Space Charge Distribution for Optimized Design of HVDC Cables. IEEE Transactions on Industry Applications 2019, 55, 7165 -7174.

AMA Style

Antonino Imburgia, Pietro Romano, Guido Ala, Eleonora Riva Sanseverino, Graziella Giglia. The Role of Right Interpretation of Space Charge Distribution for Optimized Design of HVDC Cables. IEEE Transactions on Industry Applications. 2019; 55 (6):7165-7174.

Chicago/Turabian Style

Antonino Imburgia; Pietro Romano; Guido Ala; Eleonora Riva Sanseverino; Graziella Giglia. 2019. "The Role of Right Interpretation of Space Charge Distribution for Optimized Design of HVDC Cables." IEEE Transactions on Industry Applications 55, no. 6: 7165-7174.

Conference paper
Published: 01 July 2019 in 2019 AEIT International Conference of Electrical and Electronic Technologies for Automotive (AEIT AUTOMOTIVE)
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ACS Style

Vincenzo Castiglia; R. Miceli; Guido Ala; C. Cecati; C. Buccella; M. G. Cimoroni. A 9-level three-phase multilevel converter with harmonic mitigation and integrated battery balancing. 2019 AEIT International Conference of Electrical and Electronic Technologies for Automotive (AEIT AUTOMOTIVE) 2019, 1 .

AMA Style

Vincenzo Castiglia, R. Miceli, Guido Ala, C. Cecati, C. Buccella, M. G. Cimoroni. A 9-level three-phase multilevel converter with harmonic mitigation and integrated battery balancing. 2019 AEIT International Conference of Electrical and Electronic Technologies for Automotive (AEIT AUTOMOTIVE). 2019; ():1.

Chicago/Turabian Style

Vincenzo Castiglia; R. Miceli; Guido Ala; C. Cecati; C. Buccella; M. G. Cimoroni. 2019. "A 9-level three-phase multilevel converter with harmonic mitigation and integrated battery balancing." 2019 AEIT International Conference of Electrical and Electronic Technologies for Automotive (AEIT AUTOMOTIVE) , no. : 1.

Conference paper
Published: 01 June 2019 in 2019 IEEE International Conference on Environment and Electrical Engineering and 2019 IEEE Industrial and Commercial Power Systems Europe (EEEIC / I&CPS Europe)
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In this paper, the authors discuss the legal liabilities of the professional engineer as both the engineer of record of a project and the construction site manager. In particular, this paper analyzes the case of a fire at an end-user MV/LV substation of a shopping center in Italy, occurred a few years after maintenance works on the electrical installation. The professional engineer who had designed and overseen the construction of the substation was accused of criminal negligence. The authors through the examination of applicable technical standards, as well as of safety regulations, demonstrate that the professional engineer had acted diligently and that there was no ground for the negligence charges. The forensic analysis of the substation fire is provided, and the importance of the chain of custody, the chronological documentation, and the secure storing of all the artefacts and fire-damaged evidence are stressed. The authors believe that this paper can be a useful reference for electrical forensics engineers, investigating similar accidents.

ACS Style

Guido Ala; Salvatore Favuzza; Rossano Musca; Gaetano Zizzo; Massimo Mitolo. Legal Liability of Professional Engineers: the Case of a Fire at a Shopping Center. 2019 IEEE International Conference on Environment and Electrical Engineering and 2019 IEEE Industrial and Commercial Power Systems Europe (EEEIC / I&CPS Europe) 2019, 1 -4.

AMA Style

Guido Ala, Salvatore Favuzza, Rossano Musca, Gaetano Zizzo, Massimo Mitolo. Legal Liability of Professional Engineers: the Case of a Fire at a Shopping Center. 2019 IEEE International Conference on Environment and Electrical Engineering and 2019 IEEE Industrial and Commercial Power Systems Europe (EEEIC / I&CPS Europe). 2019; ():1-4.

Chicago/Turabian Style

Guido Ala; Salvatore Favuzza; Rossano Musca; Gaetano Zizzo; Massimo Mitolo. 2019. "Legal Liability of Professional Engineers: the Case of a Fire at a Shopping Center." 2019 IEEE International Conference on Environment and Electrical Engineering and 2019 IEEE Industrial and Commercial Power Systems Europe (EEEIC / I&CPS Europe) , no. : 1-4.

Conference paper
Published: 01 May 2019 in 2019 Fourteenth International Conference on Ecological Vehicles and Renewable Energies (EVER)
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In Italy the electric vehicle revolution is arrived but it still has difficulties to take off. At the moment hybrid technology would seem the most quoted, due especially to range anxiety. The aim of this work is to understand if the fuel cell technology can find place in Italy. The possibility to use fuel cell to storage electric energy is quite interesting: the charging times will be reduced, and heavy passenger transportation should be easily faced. Basing on the existing history and analysis of the information accessible, this paper addresses the existing e-mobility scenario in Italy and predicts the cities in which a hydrogen refuelling infrastructure should be more remunerative, in order to presents a measured outlook on the probable progress of this niche market

ACS Style

Fabio Viola; Dario Zaninelli; Guido Ala; Giuseppe Schettino; Vincenzo Castiglia; Rosario Miceli. Forecasting the Diffusion of Hydrogen EV Refuelling Infrastructures in Italy. 2019 Fourteenth International Conference on Ecological Vehicles and Renewable Energies (EVER) 2019, 1 -5.

AMA Style

Fabio Viola, Dario Zaninelli, Guido Ala, Giuseppe Schettino, Vincenzo Castiglia, Rosario Miceli. Forecasting the Diffusion of Hydrogen EV Refuelling Infrastructures in Italy. 2019 Fourteenth International Conference on Ecological Vehicles and Renewable Energies (EVER). 2019; ():1-5.

Chicago/Turabian Style

Fabio Viola; Dario Zaninelli; Guido Ala; Giuseppe Schettino; Vincenzo Castiglia; Rosario Miceli. 2019. "Forecasting the Diffusion of Hydrogen EV Refuelling Infrastructures in Italy." 2019 Fourteenth International Conference on Ecological Vehicles and Renewable Energies (EVER) , no. : 1-5.

Journal article
Published: 05 April 2019 in Applied Mathematics Letters
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In this paper improved fast summations are introduced to enhance a meshfree solver for the evolution of the electromagnetic fields over time. The original method discretizes the time-domain Maxwell’s curl equations via Smoothed Particle Hydrodynamics requiring many summations on the first derivatives of the kernel function and field vectors at each time step. The improved fast Gauss transform is properly adopted picking up the computational cost and the memory requirement at an acceptable level preserving the accuracy of the computation. Numerical simulations in two-dimensional domains are discussed giving evidence of improvements in the computation compared to the standard formulation.

ACS Style

Elisa Francomano; Guido Ala; Marta Paliaga. Improved fast Gauss transform for meshfree electromagnetic transients simulations. Applied Mathematics Letters 2019, 95, 130 -136.

AMA Style

Elisa Francomano, Guido Ala, Marta Paliaga. Improved fast Gauss transform for meshfree electromagnetic transients simulations. Applied Mathematics Letters. 2019; 95 ():130-136.

Chicago/Turabian Style

Elisa Francomano; Guido Ala; Marta Paliaga. 2019. "Improved fast Gauss transform for meshfree electromagnetic transients simulations." Applied Mathematics Letters 95, no. : 130-136.

Journal article
Published: 15 March 2019 in Energies
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The Field Programmable Gate Array (FPGA) represents a valid solution for the design of control systems for inverters adopted in many industry applications, because of both its high flexibility of use and its high-performance with respect to other types of digital controllers. In this context, this paper presents an experimental investigation on the harmonic content of the voltages produced by a three-phase, five level cascaded H-Bridge Multilevel inverter with an FPGA-based control board, aiming also to evaluate the performance of the FPGA through the implementation of the main common modulation techniques and the comparison between simulation and experimental results. The control algorithms are implemented by means of the VHDL programming language. The output voltage waveforms, which have been obtained by applying to the inverter the main PWM techniques, are compared in terms of THD%. Simulation and experimental results are analyzed, compared and finally discussed.

ACS Style

Guido Ala; Massimo Caruso; Rosario Miceli; Filippo Pellitteri; Giuseppe Schettino; Marco Trapanese; Fabio Viola. Experimental Investigation on the Performances of a Multilevel Inverter Using a Field Programmable Gate Array-Based Control System. Energies 2019, 12, 1016 .

AMA Style

Guido Ala, Massimo Caruso, Rosario Miceli, Filippo Pellitteri, Giuseppe Schettino, Marco Trapanese, Fabio Viola. Experimental Investigation on the Performances of a Multilevel Inverter Using a Field Programmable Gate Array-Based Control System. Energies. 2019; 12 (6):1016.

Chicago/Turabian Style

Guido Ala; Massimo Caruso; Rosario Miceli; Filippo Pellitteri; Giuseppe Schettino; Marco Trapanese; Fabio Viola. 2019. "Experimental Investigation on the Performances of a Multilevel Inverter Using a Field Programmable Gate Array-Based Control System." Energies 12, no. 6: 1016.