F. Ruffa, G. Fulco, M. Lugarà, P. Filianoti, C. De Capua
This paper aims to describe an embedded Real Time measurement and control system, based on an innovative, dynamic circuital model for LiFePO4 batteries, which allows to improve the overall efficiency of charge processes and to extend battery life. In applications such as electric traction and stationary storage, where the battery performances are critical, it is essential to have a smart management of the energy flows to improve the Quality of Service and to reduce costs. The smart charge controller proposed in this paper uses a dynamical 2 nd order circuital model to simulate the battery...
Alessio De Angelis, Paolo Carbone, Antonio Moschitta, Marco Crescentini, Roberta Ramilli, Pier Andrea Traverso
The application of a low-complexity current generator circuit and multisine signals for Electrochemical Impedance Spectroscopy (EIS) of Li-Ion batteries is presented. The proposed system is comprised of a Howland current pump driven by a general-purpose multifunction DAQ, which provides the excitation signal and acquires current and voltage waveforms from the battery under test. The presented results show that the proposed system can provide comparable results with respect to a reference instrument and potentially obtain a reduction in measurement time with respect to a single sine...
Stanislav Mašlán
The paper describes design of a digital sampling impedance bridge dedicated for battery impedance spectroscopy. It suggests topologies capable of measurement of sub-milliohm impedances in full complex plane. Paper also shows measurement uncertainty contributions of the digitizer nonlinearity and coaxial network of the bridge including parasitic inductive and capacitive couplings in the network. Combined uncertainty of the bridge with common NI 9238 digitizer ranges from less than 20 μΩ/Ω to order of 0.01 % for voltage drop above 1 mV at the measured standard in a frequency range 0.01 Hz to 5...
Pasquale Daponte, Luca De Vito, Grazia Iadarola, Sergio Rapuano
High resolution Digital-to-Analog Converters (DACs) are known to be characterized by static testing procedures with a remarkable duration, due to the huge number of employed codes. This paper proposes a method that allows to reconstruct the Integral Non-Linearity through the Compressed Sensing, by measuring the DAC output on a reduced number of codes. The proposed reduced-code test is evaluated for several compression ratios, turning out well performing in terms of Root Mean Square Error.
T. Kowalski, G. P. Gibiino, P. Barmuta, J. Szewinski, P. A. Traverso
This work presents the experimental characterization and digital post-distortion (i.e., digital linearization) of a MHz-range ADC analog front-end for gamma radiation spectroscopy measurements. The front-end was firstly characterized by means of a conventional approach yielding Total Harmonic Distortion (THD) and Effective Number Of Bits (ENOB). Then, it was tested using μs-range pulsed excitations, which are the typical waveforms encountered in gamma spectroscopy. After applying digital post-distortion, the linearized receiver shows a THD reduced by more than 20 dB, a substantial...
Giovanni Artale, Giuseppe Caravello, Antonio Cataliotti, Valentina Cosentino, Dario Di Cara, Salvatore Guaiana, Nicola Panzavecchia, Giovanni Tinè
This work is focused on the arc faults phenomenon in DC photovoltaic (PV) systems. The paper gives an overview of arc detection methods proposed in literature and presents a preliminary experimental characterization of the arcing current, focusing the attention on series arcs, whose detection is particularly challenging. Experimental tests are carried out, both in laboratory and on field, in order to investigate some relevant characteristics in the arcing current, which can be feasible for the arc detection purpose. Both arcing and non-arcing current signals are acquired and compared in both...
Davide Aloisio, Giuseppe Campobello, Salvatore Gianluca Leonardi, Francesco Sergi, Giovanni Brunaccini, Marco Ferraro, Vincenzo Antonucci, Antonino Segreto, Nicola Donato
Ageing estimation of lithium ion (Li-Ion) batteries is a key point for their massive application in the market. In this work, different Machine Learning (ML) techniques were applied and compared to evaluate the State of Health (SoH) of a cobalt based Li-Ion battery, cycled under a stationary application profile. Experimental results show that ML can be profitably used for SoH estimation.
F. Cascetta, G. Cipolletta, A. Delle Femine, D. Gallo, D. Giordano, D. Signorino
Nowadays great interest is placed on the environmental issue. Greenhouse gas emissions are more than 50 % higher than in 1990. European energy policy has been supporting efficient energy management in order to reduce the railway transport emissions by 50 % within 2030. The railway stakeholders are encouraged to adopt technological solutions to foster energy efficiency. The electrodynamic braking combined with the adoption of reversible substations is one of the most promising solutions. In order to evaluate the impact of this innovative technology, a measurement campaign has been conducted...
Andrea Mariscotti
The work gives an overview of Power Quality phenomena of DC grids, relevant with respect to normative requirements and impact on equipment. The objective is defining the minimum requisites to define suitable PQ indexes that are able to quantify the severity of the impact (interference to equipment, network instability, stress and aging of components), fulfil existing normative exigencies and propose improvements to existing standards.
D. Giordano, D. Signorino, C. Landi, A. Delle Femine, M. Luiso, G. Crotti
The liberalization of the railway market and the aim of fostering the interoperability among European countries makes the monitoring of the quality of the power (PQ) exchanged between trains and supply system even more important. At the moment, definitions, procedures and techniques for DC railway systems are under development. In this contest, the paper proposes a reference generation system able to reproduce the voltage and current waveforms experienced at pantograph by a DC 3 kV locomotive. The system is able to generate simultaneously voltage and current signals up to 10 kV peak and 1.2...