MARISCOTTI A.

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...

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 non-active power flow, relating it to the characteristic of the network and to operating conditions, synthesised in the...

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...

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,...

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...

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, and track circuit operation. This work presents the physical and mathematical...

Electric arcing is an unavoidable consequence of the current collection process by sliding contact in railways and metros, and in general in many electrified transportation systems (ETSs). The most relevant consequences in an electrical perspective are: the occurrence of transients triggering resonant behaviour and transient responses,...

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...

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....

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...

Railway power conditioners are widely adopted to improve Power Quality of electric railways. The present study focuses on the main architectures and the simplest, but effective, control method (PI controller): DC-link voltage and output current sequence are the controlled quantities and optimization is reached iteratively, showing the...

The measured harmonic content (voltage and current) of the AC side of a rectifier substation of a DC electrified railway, Dubai Metro, is presented. The measured harmonic content is assessed for compliance against the permissible limits specified in IEEE Std 519. Some results are also given for the amplitude of characteristic and...

Leakage currents from a dc-electrified railway requires careful consideration throughout the life time of the railway. The design objective is to minimize 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...

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...

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...

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...