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130 results on '"Femia, N."'

2. Design of dc/dc converters for DMPPT PV applications based on the concept of energetic efficiency

Author

Adinolfi, G., Femia, N., Petrone, G., Spagnuolo, G., and Vitelli, M.

Subjects
Electric current converters -- Design and construction, Photovoltaic power generation -- Methods, Photovoltaic power generation -- Equipment and supplies, Circuit design -- Methods, Energy efficiency -- Research, Electric current converter, Circuit designer, Integrated circuit design, Engineering and manufacturing industries, Environmental issues
Abstract

Distributed maximum power point tracking (DMPPT) is one of the most promising solutions to overcome the drawbacks associated with mismatching phenomena in photovoltaic (PV) applications. DMPPT is based on the adoption of a dc/dc converter dedicated to each PV module. The design of the power stage of such a converter is a challenging task because of the very high efficiency requirements and of the continuous changes of the operating point during the day, depending on the sun irradiation conditions. In this paper the guidelines for the design of dc-dc converters for DMPPT applications are presented and discussed. [DOI: 10.1115/1.4001465]

Published
2010

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. 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., Bruna Romero, J., Laporta Puyal, E., Pichon, L., Freschi, F., Cirimele, V., Bauer, P., Dong, J., Maffucci, A., Ventre, S., Femia, N., Di Capua, G., Kuster, N., Liorni, I., DI CAPUA, Giulia, Istituto Nazionale di Ricerca Metrologica (INRiM), Laboratoire Génie électrique et électronique de Paris (GeePs), Université Paris-Sud - Paris 11 (UP11)-CentraleSupélec-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Politecnico di Torino = Polytechnic of Turin (Polito), Università degli studi di Cassino e del Lazio Meridionale (UNICAS), Dipartimento di Automazione Elettromagnetismo Ingegneria dell'Informazione Matematica Industriale (DAEIMI), Zucca M., Bottauscio O., Harmon S., Guilizzoni R., Schilling F., Schmidt M., Ankarson P., Bergsten T., Tammi K., Sainio P., Bruna Romero J., Laporta Puyal E., 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, Traceability, Computer science, 020209 energy, Dosimetry, Energy efficiency, Inductive charging, Magnetic fields, Metrology, Safety, FOS: Physical sciences, 02 engineering and technology, 7. Clean energy, Metrology Safety, Automotive engineering, [SPI]Engineering Sciences [physics], 0202 electrical engineering, electronic engineering, information engineering, Calibration, media_common.cataloged_instance, Electrical measurements, Instrumentation (computer programming), European union, media_common, 020208 electrical & electronic engineering, Instrumentation and Detectors (physics.ins-det), [SPI.ELEC]Engineering Sciences [physics]/Electromagnetism, Magnetic field, Electric power
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., 2019 AEIT International Conference of Electrical and Electronic Technologies for Automotive, 2-4 July 2019, Torino (Italy)

Published
2019
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5. 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

6. 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

7. 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

8. 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

10. A Technique for Improving P&O MPPT performances of Double Stage Grid-Connected Photovoltaic Systems

Author

FEMIA N., PETRONE G., SPAGNUOLO G., VITELLI, Massimo, Femia, N., Petrone, G., Spagnuolo, G., and Vitelli, Massimo

Subjects
Inverter, maximum power point tracking, photovoltaic power processing systems
Abstract

In double-stage grid-connected photovoltaic (PV) inverters, the dynamic interactions among the dc/dc and dc/ac stages and the maximum power point tracking (MPPT) controller may reduce the system performances. In this paper, the detrimental effects, particularly in terms of system efficiency and MPPT performances, of the oscillations of the PV array voltage, taking place at the second harmonic of the grid frequency are evidenced. The use of a proper compensation network acting on the error signal between a reference signal provided by theMPPT controller and a signal that is proportional to the PV array voltage is proposed. The guidelines for the proper joint design of the compensation network (which is able to cancel out the PV voltage oscillations) and of the main MPPT parameters are provided in this paper. Simulation results and experimental measurements confirm the effectiveness of the proposed approach.

Published
2009

14. Resistive losses of conductors carrying SMPS current waveforms

Author

Femia, N., Lamberti, P., Spagnuolo, G., Massimo Vitelli, N., Femia, P., Lamberti, G., Spagnuolo, and Vitelli, Massimo

Subjects
Engineering, Skin Effect, Proximity Effect, Resistance, Switch-Mode Power Supplies, Switched-mode power supply, business.industry, Electrical engineering, Electromagnetic coil, Frequency domain, Harmonics, Waveform, Skin effect, Magnetic potential, Proximity effect (electromagnetism), business
Abstract

Switch-mode power supplies (SMPS) generate distorted nonsinusoidal current waveforms flowing into conductors (wires, striplines, windings), which cause ohmic losses mainly ruled by the skin-effect. Skin effect is traditionally studied in the frequency domain; most studies on the effects of distorted SMPS current waveform are devoted to examine the so-called high-frequency effects, namely the behavior of components and systems at the switching frequency and its harmonics, considering a virtual sinusoidal steady-state operation at each frequency of the range under study. In this paper skin-effect has been studied in the time-domain by means of a formulation based on a magnetic vector potential A and on a scalar potential p. The obtained results show that the equivalent per-unit length resistance of conductors carrying typical SMPS nonsinusoidal current waveforms depend both on switching frequency and duty-cycle and is rather different from DC and AC sinusoidal equivalent resistances.

Published
2002

24. Experimental analysis of open-circuit voltage hysteresis in lithium-iron-phosphate batteries.

Author

Baronti, F., Zamboni, W., Femia, N., Roncella, R., and Saletti, R.

Abstract

This paper aims at investigating and modelling the hysteresis in the relationship between state-of-charge and open-circuit voltage of lithium-iron-phosphate batteries. A first-order charge relaxation equation was used to describe the hysteresis dynamics. This equation was translated into a voltage-controlled voltage source and included within an equivalent electric circuit of the battery used in online state-of-charge estimators. The effectiveness of the obtained battery model was verified comparing simulated and experimental data. [ABSTRACT FROM PUBLISHER]

Published
2013
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25. Stability limit analysis for peak-current-controlled Ćuk converter.

Author

Cantillo, A., Di Capua, G., Femia, N., Spagnuolo, G., and Zamboni, W.

Abstract

The goal of this paper is to derive the analytical stability boundaries for Ćuk converter and to highlight the joint impact of power stage passive components and current controller characteristics on the converter stability. Stability conditions are determined by means of a novel dynamic model of the Peak Current Controlled (PCC) Ćuk converter, taking into account the difference between the small signal ac components of the voltage across coupling capacitor and of the sum of input and output voltage. A reduced-order small model of PCC Ćuk converter is proposed. [ABSTRACT FROM PUBLISHER]

Published
2013
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