Pietro Romano - Academia.edu (original) (raw)

Papers by Pietro Romano

Research paper thumbnail of Technical and economical evaluation on the use of a reconfiguration systems in some EU countries for PV plants

IEEE Transactions on Industry Applications, 2016

Research paper thumbnail of (5) A Dynamic Electrical Scheme Applied M 2012

Research paper thumbnail of Insulation Systems in High Power Motors Fed by Inverters: a New Approach by Thermal and Electrical Investigations

Research paper thumbnail of Algoritmi DI Ottimizzazione Delle Connessioni DI Sistemi Fotovoltaici

Article CITATIONS 0 READS 8 7 authors, including: Some of the authors of this publication are als... more Article CITATIONS 0 READS 8 7 authors, including: Some of the authors of this publication are also working on these related projects: Simultaneous measurements of space charges and partial discharges View project R. Candela Prysmian Group

Research paper thumbnail of Dynamic programming and Munkres algorithm for optimal photovoltaic arrays reconfiguration

Research paper thumbnail of Switching Apparatus for Photovoltaic Panels

Research paper thumbnail of Apparato di commutazione

Research paper thumbnail of Finite Difference Time Domain simulation of towers cascade under lightning surge conditions

IEEE Transactions on Industry Applications, 2015

Research paper thumbnail of Performances of rainfall energy harvester

In this paper the performances of rainfall energy harvesting by means of piezoelectric transducer... more In this paper the performances of rainfall energy harvesting by means of piezoelectric transducers is presented. Diverse studies agree on the level of suitable generated voltage on the electrodes of a piezoelectric transducer subjected to rainfall, but a complete characterization on the supplied power is still missing. This work, in order to limit optimistic forecasts, takes into account the behavior of the transducers subjected to real and also artificial rainfall, condition that has shown promising behavior in laboratory. In order to increase the energy harvesting and also define its limits different loads have been taken into account. Only commercial transducers have been considered: a lead zirconate titanate and polyvinylidene difluoride transducer.

Research paper thumbnail of Caratterizzazione Elettromagnetica DI Igbt in Presenza DI Scariche Parziali

Research paper thumbnail of Proof of Concept of an Irradiance Estimation System for Reconfigurable Photovoltaic Arrays

Research paper thumbnail of Analysis of partial discharge activity at different temperatures through an heuristic algorithm

1999 Annual Report Conference on Electrical Insulation and Dielectric Phenomena (Cat. No.99CH36319), 1999

Research paper thumbnail of Optimisation of a numerical model for analysis of partial discharge phenomena in a flat cavity

2001 Annual Report Conference on Electrical Insulation and Dielectric Phenomena (Cat. No.01CH37225), 2001

The failure probability of the insulation in H V components can be studied through Partial Discha... more The failure probability of the insulation in H V components can be studied through Partial Discharge (PD) measurements to detect defects. In this paper a numerical model, previously developed by the authors for the simulation of PD activity in a spherical void embedded in epoxy resin, is implemented to a flat cavity under divergent electric field. This situation simulates very well the real working conditions encountered in the insulation of electrical machines. The model is developed taking into account all the geometric and electrical parameters, indeed it is carried out a fine examination on physical parameters playing a fundamental role on the PD phenomenon. In particular, a more accurate formulation of the work function and a Finite Elements Analysis (FEA) of electric field inside the cavity has been applied. Indeed a new approach is investigated to reproduce the uncertainty of the discharge phenomenon. A probability fimction distribution, obtained by Weibull analysis, gains the best results. In order to obtain the best fitting o f the model output to the experimental PD data, a strong procedure based on an heuristic algorithm has been performed. This algorithm detects the minimum of a quality function that evaluates the distance between the PD patterns of the numerical model and of the experimental data. After a description of the numerical model adopted, a comparison between the experimental and the simulated data are presented together with comments and remarks.

Research paper thumbnail of Supply Chain Coordination

Wiley Encyclopedia of Management, 2015

Research paper thumbnail of Vendor-Managed Inventory

Wiley Encyclopedia of Management, 2015

Research paper thumbnail of Continuous Replenishment Programs

Wiley Encyclopedia of Management, 2015

Research paper thumbnail of Numerical simulation of PD activity in a spherical cavity embedded in the stator winding insulation of an inverter-fed induction motor

2001 Annual Report Conference on Electrical Insulation and Dielectric Phenomena (Cat. No.01CH37225), 2001

Research paper thumbnail of Un Nuovo Approccio Per L’Identificazione DI Segnali DI Scariche Parziali Multisorgente Attraverso Decomposizione Wavelet Multirisoluzione

Il nuovo metodo di riconoscimento proposto, sfruttando le conoscenze acquisite nel campo dell'ela... more Il nuovo metodo di riconoscimento proposto, sfruttando le conoscenze acquisite nel campo dell'elaborazione di immagini, si basa sull'applicazione della decomposizione wavelet multirisoluzione (MWD) per l'identificazione di fenomeni di scarica sovrapposti.

Research paper thumbnail of Optimization of photovoltaic energy production through an efficient switching matrix

This work presents a preliminary study on the implementation of a new system for power output max... more This work presents a preliminary study on the implementation of a new system for power output maximization of photovoltaic generators under non-homogeneous conditions. The study evaluates the performance of an efficient switching matrix and the relevant automatic reconfiguration control algorithms. The switching matrix is installed between the PV generator and the inverter, allowing a large number of possible module configurations. PV generator, switching matrix and the intelligent controller have been simulated in Simulink. The proposed reconfiguration system improved the energy extracted by the PV generator under non-uniform solar irradiation conditions. Short calculation times of the proposed control algorithms allow its use in real time applications even where a higher number of PV modules is required.

Research paper thumbnail of PD performance of dielectric insulations in presence of low frequency conducted disturbances: a life model approach

2001 Annual Report Conference on Electrical Insulation and Dielectric Phenomena (Cat. No.01CH37225), 2001

The problem of how 50Hz power supply voltage distortions affect PD activity and the lifetime of e... more The problem of how 50Hz power supply voltage distortions affect PD activity and the lifetime of epoxy resin insulation systems, is addressed in this paper. In this aim, harmonics up to the 5'h were summed up to the voltage fundamental component changing the waveform from the sinusoidal into its peaked or flattened resulting shape. In a previous paper, life tests were performed using a sphere-plane electrode configuration, now the experimental research has been carried out in progress, and an analysis of the PD aging phenomena was carried out in both sinusoidal and non-sinusoidal life tests by a digital PD system. A good agreement has been found between the physical phenomena involved during -the aging and the obtained new related lifetimes. Finally, a life model is proposed to establish a functional relationship between the shape characteristics of the applied voltage and the failure times, thus providing a useful tool to evaluate the epoxy life changes due to the presence of voltage harmonics with respect to the sinusoidal supply.

Research paper thumbnail of Technical and economical evaluation on the use of a reconfiguration systems in some EU countries for PV plants

IEEE Transactions on Industry Applications, 2016

Research paper thumbnail of (5) A Dynamic Electrical Scheme Applied M 2012

Research paper thumbnail of Insulation Systems in High Power Motors Fed by Inverters: a New Approach by Thermal and Electrical Investigations

Research paper thumbnail of Algoritmi DI Ottimizzazione Delle Connessioni DI Sistemi Fotovoltaici

Article CITATIONS 0 READS 8 7 authors, including: Some of the authors of this publication are als... more Article CITATIONS 0 READS 8 7 authors, including: Some of the authors of this publication are also working on these related projects: Simultaneous measurements of space charges and partial discharges View project R. Candela Prysmian Group

Research paper thumbnail of Dynamic programming and Munkres algorithm for optimal photovoltaic arrays reconfiguration

Research paper thumbnail of Switching Apparatus for Photovoltaic Panels

Research paper thumbnail of Apparato di commutazione

Research paper thumbnail of Finite Difference Time Domain simulation of towers cascade under lightning surge conditions

IEEE Transactions on Industry Applications, 2015

Research paper thumbnail of Performances of rainfall energy harvester

In this paper the performances of rainfall energy harvesting by means of piezoelectric transducer... more In this paper the performances of rainfall energy harvesting by means of piezoelectric transducers is presented. Diverse studies agree on the level of suitable generated voltage on the electrodes of a piezoelectric transducer subjected to rainfall, but a complete characterization on the supplied power is still missing. This work, in order to limit optimistic forecasts, takes into account the behavior of the transducers subjected to real and also artificial rainfall, condition that has shown promising behavior in laboratory. In order to increase the energy harvesting and also define its limits different loads have been taken into account. Only commercial transducers have been considered: a lead zirconate titanate and polyvinylidene difluoride transducer.

Research paper thumbnail of Caratterizzazione Elettromagnetica DI Igbt in Presenza DI Scariche Parziali

Research paper thumbnail of Proof of Concept of an Irradiance Estimation System for Reconfigurable Photovoltaic Arrays

Research paper thumbnail of Analysis of partial discharge activity at different temperatures through an heuristic algorithm

1999 Annual Report Conference on Electrical Insulation and Dielectric Phenomena (Cat. No.99CH36319), 1999

Research paper thumbnail of Optimisation of a numerical model for analysis of partial discharge phenomena in a flat cavity

2001 Annual Report Conference on Electrical Insulation and Dielectric Phenomena (Cat. No.01CH37225), 2001

The failure probability of the insulation in H V components can be studied through Partial Discha... more The failure probability of the insulation in H V components can be studied through Partial Discharge (PD) measurements to detect defects. In this paper a numerical model, previously developed by the authors for the simulation of PD activity in a spherical void embedded in epoxy resin, is implemented to a flat cavity under divergent electric field. This situation simulates very well the real working conditions encountered in the insulation of electrical machines. The model is developed taking into account all the geometric and electrical parameters, indeed it is carried out a fine examination on physical parameters playing a fundamental role on the PD phenomenon. In particular, a more accurate formulation of the work function and a Finite Elements Analysis (FEA) of electric field inside the cavity has been applied. Indeed a new approach is investigated to reproduce the uncertainty of the discharge phenomenon. A probability fimction distribution, obtained by Weibull analysis, gains the best results. In order to obtain the best fitting o f the model output to the experimental PD data, a strong procedure based on an heuristic algorithm has been performed. This algorithm detects the minimum of a quality function that evaluates the distance between the PD patterns of the numerical model and of the experimental data. After a description of the numerical model adopted, a comparison between the experimental and the simulated data are presented together with comments and remarks.

Research paper thumbnail of Supply Chain Coordination

Wiley Encyclopedia of Management, 2015

Research paper thumbnail of Vendor-Managed Inventory

Wiley Encyclopedia of Management, 2015

Research paper thumbnail of Continuous Replenishment Programs

Wiley Encyclopedia of Management, 2015

Research paper thumbnail of Numerical simulation of PD activity in a spherical cavity embedded in the stator winding insulation of an inverter-fed induction motor

2001 Annual Report Conference on Electrical Insulation and Dielectric Phenomena (Cat. No.01CH37225), 2001

Research paper thumbnail of Un Nuovo Approccio Per L’Identificazione DI Segnali DI Scariche Parziali Multisorgente Attraverso Decomposizione Wavelet Multirisoluzione

Il nuovo metodo di riconoscimento proposto, sfruttando le conoscenze acquisite nel campo dell'ela... more Il nuovo metodo di riconoscimento proposto, sfruttando le conoscenze acquisite nel campo dell'elaborazione di immagini, si basa sull'applicazione della decomposizione wavelet multirisoluzione (MWD) per l'identificazione di fenomeni di scarica sovrapposti.

Research paper thumbnail of Optimization of photovoltaic energy production through an efficient switching matrix

This work presents a preliminary study on the implementation of a new system for power output max... more This work presents a preliminary study on the implementation of a new system for power output maximization of photovoltaic generators under non-homogeneous conditions. The study evaluates the performance of an efficient switching matrix and the relevant automatic reconfiguration control algorithms. The switching matrix is installed between the PV generator and the inverter, allowing a large number of possible module configurations. PV generator, switching matrix and the intelligent controller have been simulated in Simulink. The proposed reconfiguration system improved the energy extracted by the PV generator under non-uniform solar irradiation conditions. Short calculation times of the proposed control algorithms allow its use in real time applications even where a higher number of PV modules is required.

Research paper thumbnail of PD performance of dielectric insulations in presence of low frequency conducted disturbances: a life model approach

2001 Annual Report Conference on Electrical Insulation and Dielectric Phenomena (Cat. No.01CH37225), 2001

The problem of how 50Hz power supply voltage distortions affect PD activity and the lifetime of e... more The problem of how 50Hz power supply voltage distortions affect PD activity and the lifetime of epoxy resin insulation systems, is addressed in this paper. In this aim, harmonics up to the 5'h were summed up to the voltage fundamental component changing the waveform from the sinusoidal into its peaked or flattened resulting shape. In a previous paper, life tests were performed using a sphere-plane electrode configuration, now the experimental research has been carried out in progress, and an analysis of the PD aging phenomena was carried out in both sinusoidal and non-sinusoidal life tests by a digital PD system. A good agreement has been found between the physical phenomena involved during -the aging and the obtained new related lifetimes. Finally, a life model is proposed to establish a functional relationship between the shape characteristics of the applied voltage and the failure times, thus providing a useful tool to evaluate the epoxy life changes due to the presence of voltage harmonics with respect to the sinusoidal supply.