Ricerc@Sapienza

This article reports an overview of main issues related to hosting capacity and harmonic disturbances caused by electric vehicle (EV) penetration in a smart grid, taking into account renewable energy sources and energy storage systems as well as nonlinear loads. A new mixed deterministic and probabilistic method based on algorithms and new control strategies, able to perform EVs charging controls, is presented. The methodology shows that it is possible to achieve high levels of power quality, thanks to a pre-evaluation of harmonic disturbance.

The paper proposes a computational procedure able to control in real-time the harmonic disturbance injected by nonlinear loads in an islanded MV/LV Smart Grid, characterized by low short circuit power. Aim of the proposed procedure is to keep automatically under acceptable values the penetration of harmonic disturbances caused by different loads, by means of a control algorithm suitable to a Smart Grid context.

In the last decade, the importance of modern grids is more sensible than before due to provided higher efficiency, reduced peak demand, improved security resulting in the alteration of grid shape from conventional grids to smart grids. The case study is the port of Long Beach (POLB), placed in California, which consists of 11 independent piers operating as a single microgrid that has an independent energy management system.

Making electric power grids smart is invariably linked to the implementation of an advanced communication infrastructure that is able to transport sensing, control and automation information timely, reliably and efficiently. Reusing the power line themselves to realize (part of) this infrastructure is an obvious choice that has a long and successful track record with power utilities.

Il contributo affronta il tema del progetto degli spazi pubblici aperti come definizione di un sistema di luoghi che - nella città contemporanea – oltre a interagire con il costruito in termini di reciproco feedback microclimatico, configura un’infrastruttura di supporto per l’uso efficiente delle risorse materiali e immateriali su scala di insediamento.