**Preface to "Modeling and Simulation of Electricity Systems for Transport and Energy Storage"**

The extensive evolution of electrical systems, due to the increase in distributed generation and renewable sources, has also had effects on electrical transportation systems, in order to improve energy efficiency and environmental sustainability.

In the urban context, the development of not only constrained guideway systems but also those of recent diffusion with hybrid and/or all-electric propulsion such as cars, bikes and scooters, have been characterized by both shorter times and high-power charging requests, with a strong impact on the power systems in terms of stability, PQ, power flows management, etc.

In the extra-urban context, significant technological evolution took place not only in railway transportation systems, but also in the transport of goods by road, with possible highway electrification.

In these new frameworks, energy storage systems are widely used both for increasing energy efficiency and for voltage regulation.

The new electric scenario for transportation systems therefore requires preliminary studies that involve the use of models and calculation procedures suitable for carrying out in-depth analysis.

This book comprises five peer-reviewed articles covering original research articles on the modeling and simulation of electricity systems for transport and energy storage. Topics include optimal siting and sizing methodology to design an energy storage system (ESS) for railway lines, technical–economic comparison between a 3 kV DC railway and the use of trains with on-board storage systems, how to improve electrical feeding substations, by changing transformer technology and by installing dedicated high-power oriented storage systems, algorithms applied to vehicle-to-grid (V2G) technology, thermal investigation and the optimization of an air-cooled lithium-ion battery pack.

> **Regina Lamedica, Alessandro Ruvio** *Editors*
