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29 results on '"Femia, N."'

1. Metrology for Inductive Charging of Electric Vehicles (MICEV)

Author

Zucca, M., Bottauscio, O., Harmon, S., Guilizzoni, R., Schilling, F., Schmidt, M., Ankarson, P., Bergsten, T., Tammi, K., Sainio, P., Romero, J. B., Puyal, E. L., Pichon, L., Freschi, F., Cirimele, V., Bauer, P., Dong, J., Maffucci, A., Ventre, S., Femia, N., Di Capua, G., Kuster, N., and Liorni, I.

Subjects
Physics - Instrumentation and Detectors
Abstract

The European Union funded project MICEV aims at improving the traceability of electrical and magnetic measurement at charging stations and to better assess the safety of this technology with respect to human exposure. The paper describes some limits of the instrumentation used for electrical measurements in the charging stations, and briefly presents two new calibration facilities for magnetic field meters and electric power meters. Modeling approaches for the efficiency and human exposure assessment are proposed. In the latter case, electromagnetic computational codes have been combined with dosimetric computational codes making use of highly detailed human anatomical phantoms in order to establish human exposure modeling real charging stations. Detailed results are presented for light vehicles where, according to our calculations, the concern towards human exposure is limited. Currently, the project has reached half way point (about 18 months) and will end in August 2020., Comment: 2019 AEIT International Conference of Electrical and Electronic Technologies for Automotive, 2-4 July 2019, Torino (Italy)

Published
2019
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3. Optimal buck converter output filter design for point-of-load applications

Author

De Nardo, A., Femia, N., Petrone, G., and Spagnuolo, G.

Subjects
Electric current converters -- Design and construction, Electric current regulators -- Usage, Voltage regulators -- Usage, Electric current converter, Business, Computers, Electronics, Electronics and electrical industries
Published
2010

4. Predictive & adaptive MPPT perturb and observe method

Author

Femia, N., Granozio, D., Petrone, G., Spagnuolo, G., and Vitelli, M.

Subjects
Photovoltaic power generation -- Equipment and supplies, Analog to digital converters -- Design and construction, Adaptive control -- Methods, Circuit design -- Research, Circuit designer, Integrated circuit design, Aerospace and defense industries, Business, Computers, Electronics, Electronics and electrical industries
Abstract

The perturb and observe (P&O) best operation conditions are investigated in order to identify the edge efficiency performances of this most popular maximum power point tracking (MPPT) technique for photovoltaic (PV) applications. It is shown that P&O may guarantee top-level efficiency, provided that a proper predictive (by means of a parabolic interpolation of the last three operating points) and adaptive (based on the measure of the actual power) hill climbing strategy is adopted. The approach proposed is aimed at realizing, in addition to absolute best tracking performances, high robustness and promptness both in sunny and cloudy weather conditions. The power gain with respect to standard P&O technique is proved by means of simulation results and experimental measurements performed on a low power system. Besides the performance improvements, it is shown that the proposed approach allows possible reduction of hardware costs of analog-to-digital (A/D) converters used in the MPPT control circuitry.

Published
2007

5. Optimized one-cycle control in photovoltaic grid connected applications

Author

Femia, N., Granozio, D., Petrone, G., Spagnuolo, G., and Vitelli, M.

Subjects
Moving target indicator radar -- Research, Tracking radar -- Research, Aerospace and defense industries, Business, Computers, Electronics, Electronics and electrical industries
Abstract

The use of one-cycle control (OCC) for maximum power point tracking (MPPT) and power factor correction (PFC) in grid connected photovoltaic (PV) applications is discussed. Circuit and operating parameters of the one cycle-based controller of a cost-effective single-stage inverter are optimized in order to obtain the best performances of the system under different irradiance levels. Firstly, design constraints are formulated which allow to get a very efficient OCC operation in terms of power extracted from the PV array, stability, and PFC. Afterwards, such constraints are used to perform the parametric optimization of the one cycle controller by means of suitable heuristic approaches. Various selection criteria of the best parameters set under different conditions are discussed and applied. Finally, a customized perturb and observe (P&O) control is applied to the optimized one cycle controlled single-stage inverter in order to perform a real MPPT in presence of varying irradiance conditions. Subjects described here are covered by the Italian Patent Application SA2005A000014-13.07.2005 and PCT Application PCT/IT2005/000747-20.12.2005.

Published
2006

6. Understanding commutations in switching converters part II: analysis and synthesis of Dc-Dc regulators

Author

Femia, N. and Vitelli, M.

Subjects
Aerospace engineering -- Research, Avionics -- Research, Commutation (Electricity) -- Analysis, Equations -- Methods, Mathematical models -- Usage, Aerospace and defense industries, Business, Computers, Electronics, Electronics and electrical industries
Abstract

This paper illustrates a general method to formulate the equations for the analysis of commutations and of the effects caused by large step-wise perturbations, large change of parameters, and circuit failures in switching converters including transformers, feedback circuitry, and soft-switching cells. The matrix equations obtained by means of the modified nodal analysis--based method proposed in this work are useful for theoretical inspection of switching converters as well as for numerical simulations. The examples of applications concern the analysis and the synthesis of switching converters and show that the Compensation Theorem (CT)--based model may help in selecting circuit topologies valid for the circuit design.

Published
2003

7. Understanding commutations in switching converters part I: basic theory and application of the compensation theorem

Author

Femia, N.

Subjects
Aerospace engineering -- Research, Avionics -- Research, Electric current converters -- Analysis, Mathematical models -- Usage, Electric current converter, Aerospace and defense industries, Business, Computers, Electronics, Electronics and electrical industries
Abstract

The analysis of synchronous commutations in switching converters is discussed. A reduced resistive circuit for the analysis of synchronous commutations is introduced by applying the Compensation Theorem. Based on a matrix model, a new method for the analysis of both hard and soft synchronous commutations is formulated, which permits a straightforward understanding operation of switching converters. The method of analysis is presented herein in its basic version, for the analysis of nonisolated hard-switching converters, while the general formulation and its applications to the analysis and synthesis of dc-dc regulators is presented in the companion paper Part II.

Published
2003

8. A layered software architecture with uncertainty handling capabilities for circuit computer-aided design

Author

Cernat, M, Margineanu, I, Nicolaide, A, ARCELLI FONTANA, F, De Santo, M, Femia, N, Spaguolo, G, ARCELLI FONTANA, FRANCESCA, De Santo M, Femia N, Spaguolo G., Cernat, M, Margineanu, I, Nicolaide, A, ARCELLI FONTANA, F, De Santo, M, Femia, N, Spaguolo, G, ARCELLI FONTANA, FRANCESCA, De Santo M, Femia N, and Spaguolo G.

Abstract

In this paper we propose a layered software architecture for Circuit-CAD (CCAD) with uncertainties handling capabilities, based on the utilization of heterogeneous software agents. The need of such approach comes from the increasing requests for integration-cooperation features in modern CCAD applications, whose simulation tasks are asked to go far beyond the mere and rigid application of presumed general purpose numerical methods. Indeed, solving some hard problems, like Tolerance and Sensitivity Analysis (TSA) for strongly non linear circuits in presence of large parameters' uncertainties, benefits much more from a clever preliminary choice of the best problem-tuned numerical method rather than from a blind number crunching approach. The software architecture we propose in this paper is built by intermediate and low level agents: Dbots (Domain Software Robots), operating at decision level, and Wbots (Working Software Robots), operating at computation level. We define the nature of such agents and describe their de-coupled manner of interaction, which enables implementing dynamic adaptive resolution schemes for given CCAD tasks. Furthermore, we present an example of use of the proposed architecture utilizing Java to specify agents as active objects. Some applications of the new strategy to TSA circuits-related problems are presented

Published
1998

12. Novel software architecture for computer-aided analysis of circuits with uncertain parameters

Author

De Santo, M, Femia, N, Spagnuolo, G, Arcelli Fontana, F, De Santo, M, Femia, N, Spagnuolo, G, and Arcelli Fontana, F

Abstract

In recent years much interest is grown about the possibility to apply novel software technologies (such as those ones coming from Artificial Intelligence) to the field of Scientific Calculus. There is an increasing need of such approaches due to the hard requests for integration-cooperation features in modern applications, whose simulation tasks are asked to go far beyond the mere and rigid application of presumed general purpose numerical methods. In this paper we explore the use of Software Agents for Circuit-CAD (CCAD) with uncertainties handling capabilities. In such a field, solving some hard problems, like Tolerance and Sensitivity Analysis (TSA) for strongly non-linear circuits in presence of large parameters' uncertainties, benefits much more from a clever preliminary choice of the best problem-tuned numerical method rather than from a blind number crunching approach. Software Agents seem to meet these constraints while introducing a high degree of flexibility, which enables the implementation of dynamic adaptive resolution schemes for given CCAD tasks. We present an example of use of the proposed architecture utilizing Java to specify agents as active objects. Some applications of the new strategy to TSA circuits-related problems are presented.

Published
1999

27. Analysis of Dynamic Wireless Power Transfer Systems Based on Behavioral Modeling of Mutual Inductance

Author

Fabio Freschi, Nicola Femia, Gennaro Di Mambro, Fabio Villone, Salvatore Ventre, Giulia Di Capua, Vincenzo Cirimele, Antonio Maffucci, Kateryna Stoyka, Di Capua, G., Maffucci, A., Stoyka, K., Di Mambro, G., Ventre, S., Cirimele, V., Freschi, F., Villone, F., Femia, N., Di Capua G., Maffucci A., Stoyka K., Di Mambro G., Ventre S., Cirimele V., Freschi F., Villone F., and Femia N.

Subjects
mutual inductance, Computer science, Geography, Planning and Development, lcsh:TJ807-830, lcsh:Renewable energy sources, wireless power transfer, 02 engineering and technology, Management, Monitoring, Policy and Law, 01 natural sciences, Behavioral modeling, Inductive coupling, Mutual inductance, Wireless power transfer, behavioral modeling, inductive coupling, mutual inductance, wireless power transfer, Control theory, 0103 physical sciences, 0202 electrical engineering, electronic engineering, information engineering, Sensitivity (control systems), inductive coupling, lcsh:Environmental sciences, 010302 applied physics, lcsh:GE1-350, Renewable Energy, Sustainability and the Environment, lcsh:Environmental effects of industries and plants, 020208 electrical & electronic engineering, Finite element method, Power (physics), Inductance, lcsh:TD194-195, behavioral modeling, Electromagnetic coil
Abstract

This paper proposes a system-level approach suitable to analyze the performance of a dynamic Wireless Power Transfer System (WPTS) for electric vehicles, accounting for the uncertainty in the vehicle trajectory. The key-point of the approach is the use of an analytical behavioral model that relates mutual inductance between the coil pair to their relative positions along the actual vehicle trajectory. The behavioral model is derived from a limited training data set of simulations, by using a multi-objective genetic programming algorithm, and is validated against experimental data, taken from a real dynamic WPTS. This approach avoids the massive use of computationally expensive 3D finite element simulations, that would be required if this analysis were performed by means of look-up tables. This analytical model is here embedded into a system-level circuital model of the entire WPTS, thus allowing a fast and accurate analysis of the sensitivity of the performance as the actual vehicle trajectory deviates from the nominal one. The system-level analysis is eventually performed to assess the sensitivity of the power and efficiency of the WPTS to the vehicle misalignment from the nominal trajectory during the dynamic charging process.

Published
2021

28. Preisach modelling of lithium-iron-phosphate battery hysteresis

Author

Roberto Saletti, Ciro Visone, Nicola Femia, Federico Baronti, Walter Zamboni, Baronti, F, Femia, N, Saletti, R, Visone, C, and Zamboni, W

Subjects
Preisach model of hysteresis, Battery (electricity), Engineering, Open circuit voltage, Renewable Energy, Sustainability and the Environment, business.industry, Energy Engineering and Power Technology, Experimental data, Lithium-Iron-Phosphate (LiFePO4) batteries, Function (mathematics), State-of-charge, Hysteresis, State of charge, Control theory, Hysteresis modelling, Classical Preisach model, Open Circuit Voltage, State-of-Charge, Electrical and Electronic Engineering, business, Variable (mathematics), Voltage, Lithium-iron-phosphate (LiFePO4) batterie
Abstract

The hysteresis of the open-circuit voltage as a function of the state-of-charge in a 20 Ah lithium-iron-phosphate battery is investigated starting from pulsed-current experiments at a fixed temperature and ageing state, in order to derive a model that may reproduce well the battery behaviour. The hysteretic behaviour is modelled with the classical Preisach model used in magnetic materials. The paper shows that the Preisach model can successfully be applied to the lithium-ion battery hysteresis. First, the model is discretised by using the Everett function and identified by means of experiments, in which first-order reversal branches are measured. Then, the model is simulated and compared to some experimental data collected with different current profiles and to a one-state variable model previously used in the literature. The results show that the hysteresis is well reproduced with rms errors around 2%. The advantages of the Preisach-based method, when compared to other models, are the formal and repeatable identification procedure and the limited computational resources needed for the model simulation that makes it appropriate for the online implementation on low-complexity hardware platforms.

Published
2015

29. Distributed Maximum Power Point Tracking of Photovoltaic Arrays. Novel Approach and System Analysis

Author

G. Lisi, Giovanni Spagnuolo, Giovanni Petrone, Nicola Femia, Massimo Vitelli, Femia, N., Lisi, G., Petrone, G., Spagnuolo, G., and Vitelli, Massimo

Subjects
Engineering, Steady state, business.industry, Photovoltaic system, Stability (probability), Maximum power point tracking, Field (computer science), Distributed generation, maximum power point tracking (MPPT) techniques, photovoltaic (PV) systems, Electricity generation, Reliability (semiconductor), Control and Systems Engineering, Control theory, Distributed generation, Electronic engineering, Electrical and Electronic Engineering, business
Abstract

One of the major drawbacks of photovoltaic (PV) systems is represented by the effect of module mismatching and of partial shading of the PV field. Distributed maximum power point tracking (DMPPT) is a very promising technique that allows the increase of efficiency and reliability of such systems. Modeling and designing a PV system with DMPPT is remarkably more complex than implementing a standard MPPT technique. In this paper, a DMPPT system for PV arrays is proposed and analyzed. A dc and small-signal ac model is derived to analyze steady-state behavior, as well as dynamics and stability, of the whole system. Finally, simulation results are reported and discussed.

Published
2008

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