Andrea Mariscotti

Andrea Mariscotti
Università degli Studi di Genova | UNIGE · Dipartimento di Ingegneria Navale, Elettrica, Elettronica e delle Telecomunicazioni (DITEN)

MS, PhD

About

206
Publications
86,753
Reads
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2,310
Citations
Additional affiliations
June 2019 - present
Università degli Studi di Genova
Position
  • Professor (Assistant)
March 2015 - June 2019
ASTM Sagl
Position
  • Managing Director
Description
  • Development test & measurement products; Site activity; Consultancy projects management (EMC, safety, earthing, stray currents, lightning protection).
December 2005 - June 2014
Università degli Studi di Genova
Position
  • Professor (Assistant)
Description
  • Electrical and electronic measurements; modeling and simulation of power systems and electric transportation systems; electromagnetic compatibility
Education
October 1993 - September 1996
Università degli Studi di Genova
Field of study
  • Electrical Engineering - Supply networks, Converters and Power Quality
October 1986 - December 1991
Università degli Studi di Genova
Field of study
  • Electronic Engineering

Publications

Publications (206)
Article
Full-text available
The FSV method is a recognized validation tool that initially assesses the similarity between data sets for electromagnetic measurements and models. Its use may be extended to many problems and applications, and in particular, with relation to electrical systems, but it should be characterized in terms of its uncertainty, as for measurement tools....
Article
Waveform distortion in general represent a widespread problem in electrified transports due to interference, service disruption, increased losses and ageing of components. Given the multitude of moving sources and the extremely variable operating conditions, short time records must be considered for analysis, and this increases in turn its complexi...
Article
Full-text available
Power converters for wireless power transfer (WPT) and, in general, for electrical vehicle charging are evolving in terms of nominal power and performance, bringing along non negligible emissions in the supraharmonic range (2 kHz to 150 kHz). The large installed power and the high concentration with a relatively short separation distance can be add...
Article
Full-text available
Non-intrusive load monitoring takes place in residential and industrial contexts to disaggregate and identify loads connected to a distribution grid. This work studies the applicability and effectiveness for AC railways, considering the highly dynamic behavior of rolling stock as an electric load, immersed in varying contexts of moving loads. Both...
Article
Full-text available
Electric vehicle (EV) charging represents a relevant electric load with a rapid evolution in terms of number, power rating and distortion, in particular, considering the connection to the low-voltage public grid: available short-circuit power may be limited and particularly susceptible loads may co-exist in the same grid portion. Standards can part...
Article
The measurement of conducted emissions of Switched Mode Power Supplies (SMPSs) is discussed for the 2-1000 kHz frequency range, analyzing variability caused by setup elements and test conditions. The tested SMPSs have 12 VDC output and about 20 W nominal power. They are fed by a controlled AC power supply, instead of mains, through a Line Impedance...
Article
Full-text available
Receiver position sensing is investigated in a dynamic wireless power transfer (DWPT) system for electric vehicle (EV) charging. Exploiting the peculiar behaviour of the resonator arrays input impedance, it is possible to identify the position of the receiver coil by exciting the first array resonator with a signal at a proper frequency and measuri...
Article
Full-text available
Switched-mode power supplies (SMPSs) are a relevant and widespread source of unsymmetrical conducted emissions, as they feed various electrical appliances and information technology equipment in office and residential contexts and, despite their low power rating, the limits are the same as those of larger equipment. Given the peculiar emission wave...
Article
Stray current causes inevitable corrosion to structures near electric transportation systems, especially in DC urban rail transit. The paper considers the issue of stray current mitigation discussing what can be done for design and existing systems, sticking to applicable standards and consolidated protection practice. Mitigation measures may be de...
Article
Full-text available
Electromagnetic field emissions of modern power systems have increased in complexity if the many power conversion forms by means of power electronics and static converters are considered. In addition, the installed electric power has grown in many everyday applications such as wireless charging of vehicles, home integrated photovoltaic systems, hig...
Article
Full-text available
This work addresses the problem of power quality (PQ) metrics (or indexes) suitable for DC grids, encompassing low and medium voltage applications, including electric transports, all-electric ships and aircrafts, electric vehicles, distributed generation and microgrids, modern data centers, etc. The two main pillars on which such PQ indexes are dis...
Article
Full-text available
Modern electrified transportation systems feature increasing installed power and performance and correspondingly stray current phenomena and corrosion are receiving more attention in terms of contractual specifications and request of final validation of proposed solutions, as well as a maintenance program that can actively tackle stray current issu...
Conference Paper
The paper presents a study of the influence of the measurement setup to the variability and uncertainty of conducted emissions of Switched Mode Power Supplies (SMPS) in the 2-1000 kHz frequency range. The range was selected to cover supraharmonics and the most relevant RF conducted emissions. Tests were carried out on a 220 VAC / 12 VDC SMPS fed by...
Preprint
Full-text available
Electromagnetic field emissions of modern power systems have increased in complexity if the many power conversion forms by means of power electronics and static converters are considered. In addition, the installed electric power has grown in many every day's applications such as wireless charging of vehicles, home integrated photovoltaic systems,...
Article
Full-text available
Harmonic resonances are part of the power quality (PQ) problems of electrified railways and have serious consequences for the continuity of service and integrity of components in terms of overvoltage stress. The interaction between traction power stations (TPSs) and trains that causes line resonances is briefly reviewed, showing the dependence on i...
Article
Full-text available
Modern transit system are equipped with platform screen doors (PSDs) that represent a new element introduced in the electrical safety and stray current protection scenarios. Passengers may interact with PSDs and platform while boarding, leaving and waiting trains. Typical contractual requirements and applicable standards are discussed, identifying...
Preprint
Full-text available
The work addresses the problem of Power Quality (PQ) metrics (or indexes) suitable for DC grids, encompassing Low and Medium Voltage applications, including electric transports, all-electric ships and aircrafts, electric vehicles, distributed generation and microgrids, modern data centers, etc. The two main pillars on which such PQ indexes are disc...
Preprint
Full-text available
Harmonic resonances are part of the Power Quality (PQ) problems of electrified railways and have serious consequences for the continuity of service and integrity of components in terms of overvoltage stress. The interaction between Traction Power Stations (TPSs) and trains that causes line resonances is briefly reviewed showing the dependence on in...
Article
Full-text available
DC grids can effectively feed pulsed power loads (PPLs), integrating local energy storage to minimize the impact on other connected loads and implementing buffered sub-grids to isolate susceptible loads even more. The identification of regulatory limits for PPL integration and DC grid response and the assessment of PPL impact necessitate suitable P...
Article
Full-text available
Electric machines and power drives of various sizes and ratings are fundamental elements in many applications, such as electric appliances, electric propulsion, medical systems, all with specific limits of electromagnetic emissions, different from those of the original EMC product standards. As compliance should be assessed and guaranteed during de...
Preprint
Full-text available
Stray current causes inevitable corrosion to structures near electric transportation systems, especially in DC urban rail transit. The paper considers the issue of stray current mitigation discussing what can be done for design and existing systems, sticking to applicable standards and consolidated protection practice. Mitigation measures may be de...
Article
Full-text available
In AC electrified railways there is a significant exchange of power at fundamental and harmonics in quite dynamic conditions. Harmonic patterns of AC rolling stock and railway networks are analysed in terms of active and nonactive power flow, relating it to the characteristic of the network and to operating conditions, synthesized in the fundamenta...
Article
Methods based on time-domain sampling and successive tapering and Fourier analysis, used in the “harmonics” frequency interval up to 2.4kHz, cannot be automatically extended to the 2-150 kHz interval, in particular considering the emissions of Switched-Mode Power Supplies (SMPSs) in a modern smart grid or low-voltage distribution scenario. Emission...
Article
Full-text available
Running rails in electrified transportation systems are the interface element for several phenomena related to system performance, electromagnetic compatibility and safety: useful voltage at rolling stock, short circuit current, induced voltage, stray current, track circuit operation. This work presents the physical and mathematical groundings of r...
Article
Full-text available
Accurate and comprehensive methods for the assessment of radiated electromagnetic emissions in modern electric transportation systems are a necessity. The characteristics and susceptibility of modern victim signaling and communication radio services, operating within and outside the right-of-way, require an update of the measurement methods integra...
Research Proposal
Full-text available
Main topics will be: 1) Accurate and traceable measurement of energy consumed by trains: mise en pratique of the “metrology control” to comply with the technical standards required for interoperability 2) Power quality in railway systems: what, where and how to measure? 3) Energy efficiency: how much energy can be recovered by electric braking?...
Article
Full-text available
Electrified railways are an example of ac single phase distribution networks. A non-negligible amount of active and nonactive power may be related to harmonics, especially for distorted highly-loaded systems. The paper considers the relevance of the harmonic power terms to the aim of the identification of distortion sources in a single-point perspe...
Research Proposal
Full-text available
The very last deadline of July 2021 is over. The Special Issue has attracted several submissions and our paper (with my colleague Leonardo) is the last closing paper. Please, have a look at: https://www.mdpi.com/journal/energies/special_issues/electrified_transportation
Research Proposal
Full-text available
Manuscript contributions on the following topics and beyond Electromagnetic compatibility ; Electromagnetic interference ; Harmonics ; System level EMC ; Power electronics EMC ; EMC for E-mobility ; Supraharmonics ; EMC modelling ; EMC measurements ; EMI filters ; EMC mitigation techniques Deadline 20 March 2021
Article
Full-text available
Switched-Mode Power Supplies (SMPSs) are a relevant source of conducted emissions, in particular in the frequency interval of supraharmonics, between 2 kHz and 150 kHz. When using sampled data for assessment of compliance, methods other than Fourier analysis should be considered for better frequency resolution, compact signal energy decomposition a...
Article
Full-text available
Electrified transportation systems (ETSs) are affected by stray current problems impacting within and outside the right of way on reinforcement, buried metal structures and foundations. Stray current protection systems have recently been integrated in the track structure. Track electrical quantities are, thus, usually measured to assess track insul...
Conference Paper
In DC electrified railways pantograph electric arcs represent not only a disturbance, but the step change of the pantograph voltage affects power losses directly and indirectly. The available line voltage is reduced if the train is in traction condition, the arc itself is characterized by ohmic power losses, and the triggered oscillating transient...
Conference Paper
Modern transportation systems are integrated in the urban fabric and next to populated centers. For this reason the assessment of the impact in terms of electrical and electromagnetic emissions is quite relevant: stray current, touch voltage, human exposure and interference to implantable devices. Standards, regulations and reference scenarios are...
Conference Paper
Full-text available
Electric machines and power drives of various sizes and ratings are fundamental elements in many applications, such as electric appliances, electric propulsion, medical systems, all with specific limits of electromagnetic emissions, different from those of the original EMC product standards. As compliance should be assessed and guaranteed during de...
Conference Paper
Full-text available
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 component...
Article
In electric ac railways a non-negligible amount of active and reactive power can be associated to harmonics. Electric railways are characterized by a mix of moving loads in variable operating conditions with a substantial superposition of different distortion patterns. The EN 50463-2 standard for the measurement of energy and of active and reactive...
Article
Full-text available
DC railways are characterized by particularly intense arcing caused by pantograph detachment, due to the large current intensity and the general implementation of onboard resonant filters, whose transient response is triggered by electric transients including electric arcs. Electric arc depends on the train speed (the relative speed between the sli...
Conference Paper
Full-text available
The aim of this paper is to understand the effects of low frequency (0-2kHz) conducted emissions on power quality from a microgrid based DC/DC converter under steady state and transient loading conditions. The experimental data obtained from the lab setup is analysed using Fast Fourier Transform and low frequency sinusoidal disturbance indices for...
Article
Full-text available
In electrified railways, harmonic active power terms can be significant in the order of the uncertainty required by the EN 50463-2 standard for power and energy measurements in railways. Nonactive power terms (encompassing reactive and distortion harmonic terms) are much more significant than the sole fundamental reactive power. This work considers...
Article
Full-text available
An electric arc is an example of a transient event that is quite common in electrified transportation systems as by-product of the current collection mechanism. As a broadband transient, an electric arc excites a wide range of (often oscillatory) responses related to the substation and onboard filters, as well as the line resonances and anti-resona...
Conference Paper
Power supply transients in dc railways related to filter charging may trigger network and filter oscillatory responses, as well as cause very fast voltage spikes. These phenomena are relevant not only for Power Quality and EMC, but also for their impact on the measured pantograph quantities e.g. for power and energy consumption estimate. The broadb...
Article
Full-text available
AC railways are characterized by peculiar Power Quality phenomena, where moving loads (trains, locomotives, etc.) interact with the supply network that provides electrical energy through the overhead contact line. Distortion, resonances, transients overlap in a complex dynamic scenario, that sees several and various problems of Power Quality, netwo...
Article
Full-text available
The problem of a closed-form accurate determination of self and mutual capaci-tance of conductors in air and earth is considered: the application is the complete modeling of a railway line including buried conductors. The Generalized Potential Method (GPM) is presented and analyzed with regard to conditions of validity and solution methods. The acc...
Conference Paper
Full-text available
This paper focuses on the electric circuit model of the railway supply system and locomotive to analyze the conducted effects of arc events at the sliding contact. The characterization of the arc voltage waveform is backed up by an intense preliminary laboratory activity. The comparison between simulated and measured pantograph voltage and current...
Conference Paper
Radiated electromagnetic emissions from modern electric transportation systems are subject to requirements for their assessment aiming at a general compatibility with radio services. Standards known, recalled and enforced at contractual level narrow to CENELEC EN 50121 (equivalent to IEC 62236) and UMTA 85 and successive integrations. This work syn...
Conference Paper
Highly dynamic and distorting loads like electrified trains have complex power flow schemes, with active power not exclusively assigned to the fundamental (either dc or ac). The estimate of energy consumption shall thus cover the most relevant power spectral terms, in order to adequately track and quantify the active power flow. This work investiga...
Conference Paper
A non-negligible amount of active power is carried also by harmonic (or, in general, spectral) terms, especially for highly distorted systems, such as electrified ac railways. The paper considers the distribution and correlation of these spectral active power terms, including train operating conditions, and gives criteria to select and group harmon...
Conference Paper
Power quality (PQ) phenomena characterizing the voltage and current signals of railway electricity networks differ from those present in transmission and distribution electricity grids. Presently, there are no standardized procedures focused on PQ measurement techniques explicitly for railway applications. This paper evaluates whether the standard...
Conference Paper
Full-text available
PQ metrics for DC distribution systems are considered and reviewed with the objective of covering typical PQ phenomena, of finding similarity with the more proven indexes for AC systems, identifying the most promising approaches. Both time and frequency domain methods are considered, with emphasis on compact implementation and immediacy of output q...
Conference Paper
Full-text available
Electric arcs are an unavoidable by-product of current collection by sliding contact in electrified transportation systems. Electric arcs are transient phenomena with implications for PQ measurements and wearing estimation and prevention of the sliding contact and catenary. Besides being heavily influenced by mechanical characteristics and material...
Conference Paper
Full-text available
Active power is not carried solely by the fundamental component (either dc or ac) especially for highly distorted systems, as electrified railways. The paper proposes two indexes and a preliminary assessment of the relevance of harmonic active power terms. Results are shown for three major railway systems architectures (3 kV dc, 2x25 kV 50 Hz and 1...
Article
The electrical arc occurring in the sliding contact between the supply contact line and the current collector (pantograph) of an electrical locomotive is a fast transient phenomenon able to degrade progressively the line-to-pantograph contact quality and, consequently, the continuity of operation. In order to increase the energy efficiency of the r...
Article
Full-text available
A previous work, published in ACTA IMEKO journal, pointed out the probable variability in track to ground conductance measurements, performed by using the method indicated in the A.3 of the IEC 62128-2 international standard. In this work the presence of measurement variabilities, due to connection of the negative terminal of the power supply to an...
Article
Full-text available
Methods for the measurement of track insulation are reviewed pointing out minimum necessary conditions and practical aspects, as well as consistency and repeatability of results. Track configuration, need of electrical sectioning and use of external electrodes or conductive structure are key parameters to determine suitable methods.
Conference Paper
Full-text available
Methods for the measurement of track insulation are reviewed pointing out suitability, relevant assumptions, practical aspects, consistency and repeatability of results. Track configuration, necessity of electrical sectioning and use of external electrodes or external conductive structure determine the best method to adopt.
Conference Paper
Full-text available
A previous work, published in ACTA IMEKO journal, pointed out the attention about probable variability performing track to ground conductance measurements, using the method indicated in the A.3 of the IEC 62128-2 international standard. In this work the presence of such measurement variability has been proven by on site measurements.
Article
Electric transportation systems are a challenging load for three-phase transmission lines due to load variations, reactive power, imbalance and harmonic pollution. Many power quality conditioners and compensation technologies have been developed to ensure compatibility with power systems. The most important ones are investigated, identifying parame...
Article
The feature selective validation method is a recognized validation tool that assesses the similarity between datasets especially for electromagnetic measurements and models; its use may be extended to many problems and applications involving electric systems. Implementation flaws and ambiguities are identified that may impair its accuracy and relia...
Article
Electric transportation systems have increased in complexity in several ways. For example, electrical performance has increased from what was traditionally the core of the system, a rolling stock and traction supply circuit. Today, a plethora of devices are installed for signaling, communication, and control, requiring a proportionally larger numbe...
Book
Full-text available
Railway and metro systems embed modern technologies and interface with external systems, outside world and humans. This book focuses on electromagnetic field coupling and its experimental assessment. Electromagnetics, transmission lines, antennas, the spectrum analyzer, time-frequency transforms, probability, statistics and uncertainty are the bac...
Conference Paper
The behavior of a set of performance indexes used for model validation is considered and analyzed with Monte Carlo simulations and determination of distributions of output quantities and their statistical estimates. A relevant result regards an offset appearing at index output, when considering input data uncertainty, for cases of good corresponden...
Article
Full-text available
The IEC 62128-2 (EN 50122-2) indicates methods for the measurement of rail-To-earth conductance and insulating rail joint efficiency in dc electrified railways. These methods are reviewed, considering the influence of system parameters on the accuracy and variability of results. This work reports characterization and quantification of uncertainty a...
Article
Leakage currents from a dc electrified railway requires careful consideration throughout the life time of the railway. The design objective is to minimise the current leakage from the railway return path (the running rails for a dc electrified railway, with possibly additional conductors in parallel for ac electrified systems). For this objective t...
Article
Full-text available
The validation of an electric traction network simulator is addressed by selecting the testing conditions and considering three performance indexes, which evaluate both simply amplitude and other curve features. A common interpretation scale is proposed to verify the agreement between them. Moreover, since the most complex cannot be fully used with...
Book
Full-text available
RF and microwave measurements are common to many disciplines and engineering areas: device and PCB characterization and testing, EMI and EMC, and signal integrity, during design, prototyping and production phases. Measurement setups and procedures are more and more complex and demanding in terms of accuracy, performance, flexibility. Methods and te...
Book
Full-text available
RF and microwave measurements are common to many disciplines and engineering areas: device and PCB characterization and testing, EMI an