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Paolo Attilio Pegoraro, Carlo Sitzia, Antonio Vincenzo Solinas, Sara Sulis
Characterization of a method for transmission line parameters estimation with respect to PMU measurement error modeling

The line parameters available to the System Operator can be quite different from actual values because of different reasons, such as aging, manufacturing tolerance, environmental conditions, etc. Proposals have been presented in literature to estimate line parameters and monitor their changes. Synchrophasor measurements from PMUs have appeared as a possible breakthrough for accurate estimation. A novel algorithm has been recently proposed to estimate line parameters in presence of realistic systematic errors in PMU-based measurement chains. This paper aims at characterizing the robustness of the algorithm with respect to possible mismatches of the models associated to PMU measurement errors. Systematic and random contributions are considered at different levels. Simulations on an IEEE test network help in investigating method robustness and possible limits.

Jianbo Liu, Wenqiang Li, Mei Yang, Xiao Liu, Bin Deng, Weizhao Wang, Xuefeng Ma
Design of integrated multi-user electric energy meter

In this paper, an integrated multi-user energy meter was designed, which achieves accurate measurement of multi-user energy through circuit sharing and current sampling respectively. The integrated design has the advantages of small size, low cost, easy installation and use, and easy implementation of remote data transmission and intelligent control.

Stefano Emilio Caria, Paolo Emilio Roccato
Improvement of calibration capabilities with an a posteriori evaluation of the lighting impulse international comparison EURAMET.EM-S42

By the evaluation of the EURAMET.EM-S42 intercomparison results, the Laboratorio Alte Tensioni e Forti Correnti (LATFC) of Istituto Nazionale di Ricerca Metrologica (INRiM, Italy NMI) starts an analysis of the calibration capabilities with the developed measuring system for lightning impulse voltages. This paper addresses the issue of the expanded uncertainty re-evaluation for the INRiM’s CMCs up to 200 kV according to a new analysis of the comparison reference value (CRV), without affecting the results of the other participants in the comparison for all the involved lighting impulse parameters. A validation of the new uncertainty values has been performed by means the calculation, for some test data waveforms extract for reference standard IEC 61083 - 2, of the convolution with the measured divider step response.

Leopoldo Angrisani, Pasquale Arpaia, Egidio De Benedetto, Nicola Donato, Luigi Duraccio
Latest Advancements in SSVEPs Classification for Single-Channel, Extended Reality-based Brain-Computer Interfaces

This work details the latest advancements on a single-channel, reactive Brain-Computer Interfaces developed at the Interdepartmental Research Center in Health Management and Innovation in Healthcare (CIRMIS) of the University of Naples Federico II. The proposed instrumentation is based on Extended Reality (XR) and exploits the acquisition and classification of the Steady-State Visually Evoked Potentials (SSVEPs). In particular, an XR headset is employed for generating the flickering stimuli necessary to the SSVEP elicitation. The users brain signals are captured by means of a highly wearable and portable electroencephalografic acquisition unit, which is connected to a portable processing unit in charge of processing in real time the incoming data. In this way, a deeper interaction between users and external devices with respect to traditional architectures is guaranteed. The classification capability of the proposed instrument has been significantly improved over the years. Currently, in fact, a classification accuracy up to 90% is obtained with at least 2 s of acquisition time.

Leopoldo Angrisani, Andrea Apicella, Pasquale Arpaia, Andrea Cataldo, Anna Della Calce, Allegra Fullin, Ludovica Gargiulo, Luigi Maffei, Nicola Moccaldi, Andrea Pollastro
Instrumentation for EEG-based monitoring of the executive functions in a dual-task framework

Instrumentation for electroencephalographic (EEG)-based monitoring of the executive functions in a dual-task framework is proposed. The proposed system integrates in a single solution (i) the administration of the cognitive task, (ii) the EEG signal acquisition and processing, (iii) the data storage synchronized whit an external Gait Analysis system. The system is based on a wearable passive brain computer interface solution that allows EEG monitoring during gait, by means of acoustic stimuli. The centralized platform guarantees the synchronization of all the processes, and therefore, improves the state of the art accuracy in measurements related to executive functions and gait. An experimental validation demonstrated the feasibility of the proposed solution in terms of execution of cognitive tasks during gait, real-time monitoring of EEG signals, and synchronized storage of EEG data, gait and cognitive task performances.

Giorgia Fiori, Andrea Scorza, Maurizio Schmid, Jan Galo, Silvia Conforto, Salvatore A. Sciuto
A first approach to the registration error assessment in Quality Controls of Color Doppler ultrasound diagnostic systems

Color Doppler Imaging (CDI) is widely used in diagnostic imaging, although the Quality Control procedures for Doppler testing have not been standardized yet. Therefore, in the present study, a novel parameter, called Doppler Image Registration Error (DIRE), for the quantification of the color flow superimposition in duplex imaging of CDI diagnostic systems has been proposed. According to the definition, the registration error is expected to be 0% when no colored pixels associated to the flow are outside the flow region. Its estimation has been carried out through a novel semi-automatic method based on the postprocessing of ultrasound (US) images from a flow phantom tube. Two new US diagnostic systems, equipped with a linear array probe each, have been used to collect data at different settings. Based on the promising outcomes, further studies are going to be carried out, mainly to make the results independent on the operator subjectivity.

Gabriele Bocchetta, Giorgia Fiori, Andrea Scorza, Nicola Pio Belfiore, Salvatore Andrea Sciuto
First results on the functional characterization of two rotary comb-drive actuated MEMS microgripper with different geometry

Microgrippers (MGs) are Micro Electro-Mechanical System (MEMS) devices able to manipulate cells and micrometric objects. In order to carry out their functional characterization, a comparison between two electrostatic rotary combdrives actuated prototypes with different geometries through an image analysis-based method is proposed. This study aims at evaluating and comparing the MGs displacement as a function of the supply voltage. The two investigated geometries are equipped with a single rotary comb-drive and a double rotary comb-drive actuation. MGs data have been collected through a trinocular optical microscope with a digital camera and processed by means of an algorithm implemented ad hoc in MATLAB. Based on the promising results obtained, further studies are going to be carried out by including other geometries and improving the experimental setup and implemented method.

Dragana Naumovic-Vukovic, Slobodan Skundric, Marko Cukman, Darko Ivanovic, Ivan Novko, Miroslav Bonic
Regional Interlaboratory Comparison of Measuring Systems for Current Transformers Accuracy Testing

The paper describes an intercomparison of measuring systems for current transformers accuracy testing between three laboratories Koncar - Instrument Transformers, Koncar - Electrical Engineering Institute and Electrical Engineering Institute Nikola Tesla. All laboratories are accredited according to EN/ IEC 17025: 2017 standard. The obtained discrepancies in ratio and phase errors are within participant’s declared measurement uncertainties. All laboratories have confirmed their competence (|En|≤1) for the applied measurement methods, in accordance with EN ISO/ IEC 17043.

Giovanni Bucci, Fabrizio Ciancetta, Edoardo Fiorucci, Simone Mari, Andrea Fioravanti, Andrea Silvestri
Characterization of Energy Harvesting systems from AC power lines

In recent years, energy supply has been a worldwide issue. The energy demand has increased enormously and involves all the main areas: industrial, automotive, health, monitoring, home-system, etc. Therefore, using renewable energy sources or other techniques becomes essential to produce energy. Energy harvesting systems are an indispensable alternative for converting ambient energy from the surrounding environment into electrical energy in powering autonomous electronic devices or circuits. This paper presents the characterization of energy harvesting systems for high voltage power lines. The system can recover energy from a source (DC or AC) to supply a load and manage the excess energy to a storage system. Some tests have been performed, and results have been discussed mainly from the energy point of view and self-consumption.

Deng Bin, Xu Hailong, Ma Xuefeng, Liu Jianbo, Guan Zexin, Wang Weizhao, Wang Dalong, Sun Xiaoyan, Jia Ru, Sun Xiaojie
Research on online calibration method of refrigerator intelligent inspection line

In order to solve the problem of measuring and tracing the dynamic line and static line of the wireless intelligent detection line in the assembly line workshop of an enterprise, the on-line measurement method of refrigerator intelligent detection line was studied, and a set of on-line calibration device of refrigerator intelligent detector was established. The test results show that the on-line calibration device of the refrigerator intelligent detector designed in this paper can realize the minimum measuring AC power of 0.5 W and the lowest measuring temperature of -30 °C. This measurement method solves the real-time online automatic calibration of the refrigerator intelligent testing line, as well as the real-time online measurement supervision of the measured data.

Page 115 of 977 Results 1141 - 1150 of 9762