414 research outputs found
Byzantine aqueducts of Constantinople outside the city
No full textThis dataset is related to the PhD research of Francesca Ruggeri, published in the thesis "Engineering the Byzantine Water Supply of Constantinople: mapping, hydrology and hydraulics of the long aqueducts outside the City" (2018) http://hdl.handle.net/1842/31521. This aims at providing additional material resulting from the GIS work presented in Chapter 5 of the thesis. Archaeological survey data were available from previous campaigns carried out by Prof. James Crow in the years 1995-2009 in Turkish Thrace. Such data were systematically reassessed and organised by the author to create a comprehensive database of the remains of the Byzantine aqueducts of Constantinople.
This dataset includes:
maps of the Byzantine aqueducts and related features, as image files [map];
map locations viewable in Google Earth/Google Maps, as .kmz files [kmz];
shapefiles of Water Supply route and features for GIS use [shp];
lists of features (bridges, tunnels, channels), as Excel files [excel].
All maps and GIS features were created in ESRI ArcMap by F Ruggeri.This dataset includes:
maps of the Byzantine aqueducts and related features, as image files [map];
map locations viewable in Google Earth/Google Maps, as .kmz files [kmz];
shapefiles of Water Supply route and features for GIS use [shp];
lists of features (bridges, tunnels, channels), as Excel files [excel].
All maps and GIS features were created in ESRI ArcMap by F Ruggeri
Ruggeri recites Pirandello. Story of an author and his interpreter.
No full textreservedObiettivo principale della tesi è la ricostruzione dei rapporti tra Luigi Pirandello e Ruggero Ruggeri, tra i più significativi interpreti della produzione teatrale del girgentino, al fine di delineare gli spazi di influenza dell’attore nei processi creativi del drammaturgo. La scrittura per la scena non può infatti prescindere né dalle necessità dell’interprete di veder valorizzate le proprie virtù recitative, né dall’esigenza dell’autore di predisporre un testo adatto alla compagnia che lo rappresenterà; e questo vale tanto più se a fronteggiarsi sono un attore d’esperienza come Ruggeri e un uomo di teatro del calibro di Pirandello. Il drammaturgo anticipa spesso, infatti, in numerose e ricchissime lettere indirizzate all’interprete, temi e contenuti delle pièces che va scrivendo per Ruggeri, accogliendone interessi e orientamenti teatrali; viceversa, l’attore insiste per ottenere dal girgentino opere sempre nuove da mettere in scena e addirittura avanza pretese sui testi, suggerendo modifiche e correzioni. Testimonianze di una ravvicinata collaborazione tra i due, le informazioni contenute nel carteggio vanno poi senz’altro fatte intersecare con il repertorio di Ruggeri, secondo cruciale asse di riferimento della nostra indagine: non solo i testi che Pirandello compone su misura per lui, ma l’intero ventaglio spettacolare a disposizione dell’interprete, che ci permette di ricostruire con efficacia le modalità con cui l’autore si inserisce gradualmente nella “drammaturgia d’attore” ruggeriana e nel contesto spettacolare dei primi decenni del Novecento.The main objective of the thesis is to reconstruct the relationship between Luigi Pirandello and Ruggero Ruggeri, one of the most significant interpreters of the dramatist’s production, in order to outline the actor's influence over Pirandello's creative processes. Theatrical writing cannot ignore, indeed, the actor’s necessity to showcase his own acting talents or the playwright’s need to compose a text suitable for the company that will perform it; and this is especially true when the collaboration involves an experienced actor like Ruggeri and a theatrical personality like Pirandello. The playwright often anticipates, in numerous and interesting letters to the interpreter, the themes and contents of the pièces he is writing for Ruggeri, accommodating the actor’s interests and theatrical sensibilities; vice versa, the actor constantly demands new plays and even makes claims on the texts, suggesting changes and corrections. These informations documented in the correspondence, that show a close collaboration, must be confronted with Ruggeri’s repertoire: not only the plays Pirandello wrote specifically for him but also the other works performed by the actor, allowing us to reconstruct how Pirandello gradually becomes familiar with Ruggeri’s “actor dramaturgy” and the early XXth century’s theatrical landscape
Low-Voltage Renewable Energy Communities’ Impact on the Distribution Networks
No full textRenewable energy communities (RECs) are widely regarded as a transformative opportunity to enhance the management of electricity distribution networks, benefiting the system as a whole and its participants through local energy production, increased self-consumption, and empowering citizens. However, their proliferation introduces significant challenges for distribution system management, particularly at the low-voltage (LV) level, where participants are primarily located. Despite its critical role, the LV network is often overlooked in favor of studies focusing on the system-level impacts. This paper addresses this gap by evaluating the impact of RECs on LV networks and the broader distribution system. The study analyzes various LV networks representative of the Italian context, encompassing both rural and urban areas. By leveraging the software tool OpenDSS and Monte Carlo simulations over an entire year, the analysis captures the inherent variability of load demand and photovoltaic generation, as well as the resulting network imbalances under diverse policy scenarios. The findings reveal that the increasing level of self-consumption could significantly challenge distribution network operation, limiting also the sourcing of flexibility. These results underscore the necessity for advanced management strategies and targeted investments in grid flexibility to ensure the reliability and efficiency of distribution networks integrating RECs
Optimal coordination of a pool of different EV charging stations
No full textThe transport sector will contribute to the decarbonisation goals by massively replacing internal combustion engine vehicles with electric vehicles (EVs). In Europe, up to 70 million EVs are expected by 2030. The diffusion of EVs will be accompanied by 50-70 million charging points connected to the distribution systems (at medium and low voltage levels). The EV charging causes power quality and operation issues, such as line overloading, voltage violations, and voltage unbalances. It will require extensive investments to develop a distribution system suited to face the electrification of heating and transportation. Using suitable control systems for optimal charging that consider charging session features and network criticalities can mitigate the impact of EVs on distribution grids and contribute to postponing or even avoiding significant investments. The paper proposes a strategy to reduce the effects of public charging on low-voltage networks. If already burdened by the increased electrification of end-use consumption and domestic vehicle charging, these networks are susceptible to significant voltage drops or overcurrents. The proposed strategy involves developing a signalling system that informs vehicle owners whether a charging station can guarantee a full charge based on current grid conditions. An Italian LV unbalanced network and charging habits in parking lots derived from the latest literature are used to demonstrate the effectiveness of the proposed approach
Distribution Management System Coordination for the Optimal Operation of Medium and Low Voltage Distribution Networks
No full textThe worldwide impulse to the integration in the power system of a massive amount of Renewable Energy Sources (RES) for carbon neutrality, supported by new technologies (e.g., energy storage systems, fast communication, smart meters, etc.) are making flexibility not only a need but also a real opportunity to be explored in distribution system planning and operation. This is particularly true if high power – highly coincident demand (e.g., electric vehicle charging stations, heat pumps, induction cooking) and RES have to be accommodated on the system. Unfortunately, the distribution system was designed with minimum observability and controllability, privileging economy and simplicity of operation. Thus, Distribution System Operators are experiencing and facing issues caused by network exploitation non-coherent with the original design assumption (e.g., excessive voltage rises, sudden voltage variations, power congestions, reverse power flow on primary and secondary substation transformers, etc.), that, without resorting to expensive reinforcements, can be solved only with new flexibility services potentially provided by the increasing number of distributed energy resources hosted by their networks. Since many flexibility resources are connected to the low voltage (LV) system (e.g., small photovoltaic plants with and without batteries, customers qualified to potentially participate in demand response programs, slow EV charging points), both medium voltage (MV) and LV networks have to be jointly analysed to account for their mutual interactions. Although the simultaneous analysis of a detailed representation of both systems would be the better solution for optimally operating the networks, it may produce excessive computational burden drawback.
For this reason, this paper proposes a procedure for coordinating the distribution management systems (DMSs) of the two voltage level networks. Such coordination, designed for MV and LV networks managed by the same DSO, attributes to the MV DMS the role of master in a hierarchical control that iteratively calls the LV DMS optimisation results. The approach applied to a representative case study demonstrates the opportunity of the involvement of the LV resources in the active management of the network
Technical and economic assessment of PV-coupled energy storage systems: a case study from Italy, based on field-data
No full textSignificant levels of low-carbon generation from renewables will radically modify the power quality of the network, causing contingencies and increasing the complexity of demand-generation balancing due to variable and relatively unpredictable power injections. Energy Storage Systems could support the integration of such amount of renewable energy limiting the negative impact on the network and boosting PV self-consumption, providing benefits also for the prosumers. For this purpose, coupled PV-ESS residential storage systems were developed in six European Mediterranean countries, through EU StoRES project. In Sardinia (Italy), 13 pilots have been selected for the implementation of ESS, which consist of typical residential premises with existing rooftop PV systems under the net-metering scheme. The aim of the paper is to provide the technical and economic assessment of the coupled PV-ESS systems, based on real data measured within the StoRES project monitoring phase (one-year). The analysis is supported by well-established indicators, employed to quantify the variation of the prosumer’s electrical behaviour due to the integration of the electrical storage. Other outputs related to roundtrip efficiency shed light on battery real field operatio
Phasor Data Concentrator Functionalities to Support a Multi-Agent Control System in Active Distribution Networks
No full textOne of the goals of the Smart Grid paradigm is to fulfil consumers' demands and, at the same time, avoiding network contingencies and infrastructure overloads. In this scenario, the management of active demand based on Multi-Agent System (MAS), thanks to its flexibility and autonomy, could allow increasing the energy efficiency and reducing the cost of energy. Nevertheless, the Agents can define an effective strategy only if they are supported by a suitable measurement system providing accurate information about the state of the network (e.g. voltage profile). In this context, the paper presents a management proposal exploiting the synergy between the functionalities implemented in the Phasor Data Concentrator (PDC) specific for distribution grids and the MAS strategy to meet the load needs and to improve the voltage control in modern distribution network
Fostering End Users' Flexibility in Renewable Energy Communities
No full textEnergy communities represent a new paradigm for increasing the deployment of renewable energy, contributing significantly to the decarbonisation of the electricity system through a bottom-up approach with environmental, social, and economic benefits. Energy communities are a group of entities, individuals, or companies that join together for the production, sharing and virtual exchange of electricity generated by renewable resources. They benefit from economic contributions of three types: valorisation of shared energy through the return of tariff components (distribution, transmission and avoided grid losses); incentivisation of shared energy; and payment for electricity fed into the grid. The paper focuses on the valorisation of the flexibility of end users' demand aimed at increasing economic benefits, presenting an optimization algorithm for flexibility exploitation and a techno-economic analysis with a case study of a local energy community assuming the Italian regulatory scenario
Model to simulate medium-voltage active networks with an aggregated view of the low-voltage ends
No full textThe integration of renewable energy sources into distribution networks requires a significant change in the traditional planning and operational approach. In medium-voltage (MV) networks, in order to guarantee reliable and secure electricity supply, fostering the connection of new generation, some smart techniques, are based on the integration of operation practices in the set of possible planning alternatives, are being studied. In low-voltage (LV) networks, where distributed generation (DG), mainly photovoltaic producers, are connected in proximity to existing consumers, similar smart control techniques are being considered, either on the producer side (for instance reactive power control) or on the load side (active demand management). One of the main problems associated to the massive connection of DG is represented by the voltage quality. This study aims to describe and apply a model to simulate MV networks, while studying the maximum voltage variations in the underlying LV networks
Multi-agent control system to coordinate optimal EV charging and demand response actions in active distribution networks
No full textManagement models enabling the coordination of Active Demand and new additional loads, such us plug-in electric vehicles, with the objective of supporting the network performance under the constraints of the grid security and quality of supply, are essential to make the distribution system capable to offer services for power system operation. In the paper, an intelligent and decentralized Multi-Agent System for handling electric vehicles charging control and Active Demand programs management in the LV distribution networks is proposed. The optimization algorithm proposed allows designing valid and effective demand response and electric vehicles charging system, able to analyse and meet the vehicle charging needs to contribute to the voltage control of the distribution network. Application examples are presented in order to illustrate the algorithm effectiveness
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