106 research outputs found
APPLICATION TO AN ITALIAN DISTRIBUTION SYSTEM OF A MULTIOBJECTIVE OPTIMAL VOLT/VAR CONTROL STRATEGY: IMPROVEMENTS AND MANAGEMENT PROBLEMS
ABSTRAC
Energy Management of a Hybrid Photovoltaic-Wind System with Battery Storage: A Case Report
This work presents a case report related to the management and the monitoring of a hybrid photovoltaic-wind system with battery energy storage, installed at the administrative offices building of the municipality of Valderice (Italy) within the framework of the Italy-Tunisia ENPI cooperation project Le Développement Durable Dans la Production Energétique Dans le Territoire (DE.DU.ENER.T.). The paper describes the hybrid system and briefly reports the monitoring data for a whole year,
comparing the real production with the expected one and evaluating some performance indexes of the system. The performance indexes are very simple and have been defined only with the purpose of showing the advantages of distributed generation. Then, two different control logics for the battery energy storage systems are compared in order to
define the most suitable management of the local energy resources, in presence of different Time-of-Use electricity tariffs. In particular, the two logics are compared by varying the difference between the electricity prices in peak hours and in off-peak hours and the rate between the electricity consumption of the building and the battery energy
storage’s capacity
Evaluation of the optimal renewable electricity mix for Lampedusa island: The adoption of a technical and economical methodology
Worldwide, the majority of small islands not connected to the main grid is still dependent on fossil fuels. From an economic and environmental point of view, this condition is no more sustainable given the high costs for electricity generation and the high level of pollutant emissions. Furthermore, the dependence on fossil fuel represents a risk for the security of the supply of several small developing Countries since they are obliged to import those resources from foreign Countries. The introduction of renewable energy sources in small islands represents a valid solution to solve these problems. In this context, the paper investigates the case of Lampedusa, a small Italian island whose electrical power system is currently totally supplied by diesel power plants. In the paper, the authors investigate the transition toward an economically and technically feasible generating system based on solar, wind and sea wave plants, to achieve specific targets of decarbonization. Commercial technologies are adopted for the exploitation of solar and wind sources, while sea wave plants are based on an innovative device, currently under development at the University of Palermo. A mathematical model is proposed to find the optimal energy mix that can satisfy a fixed share of annual electricity production from renewables, considering the Levelized Cost of Electricity. Finally, the proposed solution is analyzed in order to check the dynamic stability of the power system. The paper shows that, for replacing the 40% of the current electricity demand of Lampedusa, an optimal energy mix comprising 1509 kW from photovoltaic plants, 2100 kW from wind turbines and 640 kW from wave energy converters is needed. In this way, the actualized cost for the electricity production could be reduced to 0.260 €/kWh from the current value of 0.282 €/kWh
Critical Assessment of Feed-In Tariffs and Solar Photovoltaic Development in Vietnam
Vietnam became the world’s third largest market for solar photovoltaic energy in 2020. Especially after the Vietnamese government issued feed-in tariffs for grid-connected solar photovoltaic systems, the installed capacity of solar photovoltaic applications exploded in 2019. From studies carried out in the relevant literature, it can be said that support policies are highly important for the initial development of the renewable energy industry in most countries. This is especially true in emerging countries such as Vietnam. This paper reviews the feed-in tariffs issued and deployed in different regions of Vietnam for grid-connected solar photovoltaic applications. Moreover, the paper takes a closer look at the costs of electricity production from these systems in relation to the feed-in tariffs issued in Vietnam. The results show that the gap between the levelized cost of electricity and the feed-in tariff for solar photovoltaic electricity is relatively high, particularly in regions with a lower irradiation potential
Smart grids: the next future of electrical distribution systems
Currently, the design and operation criteria for electrical distribution networks are fastly changing due to some factors; among these, the progressive penetration of Distributed Generation(DG) is destined to cause deep changes in the existing networks, no longer considered as passive terminations of the whole electrical system. Moreover, the increasing application of Information
Communication Technologies (ICT) will allow the implementation of the so called “smart grids”, determining new interesting scenarios. In the paper the problems and the potential benefits of DG, the possible new electrical distribution system models and the major research projects on smart grids are faced and reported
Il sistema della generazione distribuita. Problematiche di connessione al sistema elettrico.
Negli ultimi anni, grazie anche ai processi di liberalizzazione del mercato dell’energia
elettrica, si è assistito ad uno sviluppo della cosiddetta generazione distribuita, soprattutto
da fonte rinnovabile, il che pone non poche problematiche tra loro interconnesse di carattere sia
tecnico che normativo, economico ed ambientale. In questo lavoro dopo avere brevemente
illustrato i benefici potenziali dovuti all’introduzione di sistemi di generazione distribuita, si
considera il suo impatto sulle reti elettriche di alta, media e bassa tensione analizzando le
principali problematiche inerenti alla pianificazione, progettazione e gestione delle stesse
A Perspective on the Future of Distribution: Smart Grids, State of the Art, Benefits and Research Plans
Currently, the design and operation criteria for electrical distribution networks are fastly changing due to some factors; among these, the progressive penetration of Distributed Generation (DG) is destined to cause deep changes in the existing networks, no longer considered as passive terminations of the whole electrical system. Moreover, the in- creasing application of Information Communication Technologies (ICT) will allow the implementation of the so called \u201csmart grids\u201d, determining new interesting scenarios. In the paper the problems and the potential benefits of DG, the possible new electrical distribution system models and the major research projects on smart grids are faced and reported
Technical, Environmental and Economical Aspects of Hybrid Systems Including Renewables and Fuel Cells
In this paper, some configurations including
renewables and fuel cells are studied. Technical,
environmental and economical aspects are treated in the
frame of the EU regulations concerning the ‘emission trading’
issue and the way in which Italy has implemented the relevant
EU directive. The study has been carried out considering some
architectures including renewables such as photovoltaic and
wind with a back up system to increase continuity of supply
based on the application of fuel cells and of a hydrogen
storage system.
Performing several runs with different values of the cost of
energy (COE) bought from the network and produced with
traditional fuel, it has been observed that, for some of the
considered architectures, the breakeven point in terms of
COE is about twice the actual values.
To draw these and other interesting conclusions,
parametric studies, varying the COE bought from the
network and considering different architectures have been
carried out by means of the software HOMER 2.1 set up by
the National Renewable Energy Laboratories (NREL), USA
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