Search results for " Solar"
showing 10 items of 958 documents
Inseguitori solari: diverse tipologie e analisi tecnico-economica
2008
L’utilizzo di strutture di sostegno ad inseguimento, nella realizzazione di impianti fotovoltaici, permette di ottenere un considerevole aumento dell’energia elettrica prodotta dagli stessi impianti. L’incremento di producibilità dipende dalla tipologia di inseguitore considerata (monoassiale o biassiale) ed, in misura minore, dalla località del sito d’installazione dell’impianto fotovoltaico. Nel presente testo, dopo aver preso in rassegna le diverse tipologie di strutture ad inseguimento, descrivendone le configurazioni strutturali, le tipologie di comando ed i meccanismi di movimentazione, viene svolta un’analisi di producibilità in funzione della latitudine del sito d’installazione dell…
Generatori fotovoltaici dinamici: aspetti tecnici e valutazioni economiche per il loro impiego
2009
La strategia adottata da molte nazioni, europee e non, di affidare la produzione dell’energia elettrica ad un insieme equilibrato di fonti energetiche ha determinato un incremento delle attività di ricerca anche per lo sfruttamento della risorsa solare. Queste attività intraprese dalla comunità scientifica e seguite con attenzione dal mondo imprenditoriale si sono concentrate sulle tecniche e metodologie innovative di conversione della fonte, sulla concentrazione della radiazione solare nel punto di collocazione del dispositivo di conversione o ancora sull’ottimizzazione dell’orientamento del dispositivo rispetto alla direzione della radiazione. Questo lavoro focalizza la sua attenzione su …
Forecasting energy output of a solar power plant in curtailment condition based on LSTM using P/GHI coefficient and validation in training process, a…
2022
This study presents how to improve the short-term forecast of photovoltaic plant's output power by applying the Long Short-Term Memory, LSTM, neural networks for industrial-scale solar power plants in Vietnam under possible curtailment operation. Since the actual output power does not correspond to the available power, new techniques (Global Horizontal Irradiance - GHI interval division, P/GHI factor addition (P - Power)) have been designed and applied for processing errors and missing data. The prediction model (LSTM network, structure of hidden layers, number of nodes) has been developed by the authors in a previous work. In this new version of the model, the training technique is improve…
Apparato di commutazione
2012
La presente invenzione si riferisce ad un apparato di commutazione per il controllo e l'impostazione della configurazione circuitale dei pannelli di un modulo fotovoltaico.
2015-2020. Sicily and Italy as Electricity Hub in the Mediterranean Area for the Development of the European Power Grids Interconnections
2015
Falling demand and explosion of Renewable Energy Sources (RES) are redesigning the criteria for planning the power grids interconnections by ENTSO-E. In particular, the interconnections between networks of different countries have been acquiring importance more and more, in view of an unique European market for electricity and an increase of RES. Italy and Sicily, placed in the centre of the Mediterranean Sea, play a fundamental role as a bridge between Central Europe, North Africa area and Mediterranean islands (electricity hub). This paper aims to show how power system exchanges tend to follow the direction from South to North, and how the impact of North-African power – mainly generated …
Donor/acceptor heterojunction organic solar cells
2017
Organic solar cells (OSCs) have made very good improvements in recent years, reaching power conversion efficiencies above 10% [1]. This have been achieved through chemical synthesis of new organic materials with improved properties and also by new and more or less complex structures such as donor/acceptor (D/A) or bulk heterojunction OSCs. Here we report the results of initial development of OSCs based on the simple D/A heterojunction [2]. Copper phtalocyanine (CuPc) is used as donor organic material, whereas perylenetetracarboxylic dianhydride (PTCDA) and fullerene (C60) as acceptor organic materials. Moreover bathocuproine (BCP) is used as exciton blocking layer. Devices are fabricated by…
Non-uniform doping concentration CIGS absorber profile for highefficiency solar cells
2016
The quaternary chalcopyrite semiconductor alloy Cu(In,Ga)Se2 (CIGS) is nowadays commonly considered one of the most suitable materials to fabricate cost-effective and high-efficiency photovoltaic cells. Thanks to the optical and structural properties of the absorber layer and to the tunable bandgap, thin-film CIGS cells have reached efficiencies around 20%, not far from the maximum values of traditional crystalline silicon cells. This high efficiency, together with the conceivable low fabrication costs, makes CIGS cells a promising alternative to silicon technology for large-scale production. In order to further improve the cells performance, in a previous work we have already proposed a si…
An Embedded System for the integration of a Combined Photovoltaic Solar (CPS) system into a ZigBee Home Area Network
2011
In this paper is reported the design and implementation of an electronic system capable of communicating over a standard ZigBee network in order to let a residential gateway collector, named agent, gain access to the parameters of a Combined Photovoltaic and Solar thermal (CPS) plant, thus realizing a networked energy production appliance . The system is made of three parts: a PV metering device, a boiler metering device also capable of controlling a heating resistor embedded within the boiler tank, and a data collector acting as a ZigBee node. The data collector device periodically retrieves the following parameters from the metering devices: instantaneous photovoltaic power production, ac…
The FP7 BeyWatch European scientific project: general features and design criteria of the Combined Photovoltaic Solar (CPS) system within the BEYWATC…
2011
This paper includes the general features and design criteria of a combined photovoltaic solar system (CPS) and its allocation within the entire architecture of the BeyWatch system. The CPS main functionalities and characteristics, the description of the CPS main components and the CPS electronic control and monitoring subsystem, together with the description of the Firmware design and communication protocols are here reported. The Combined Photovoltaic and Solar system (CPS) is a Renewable Energy system that produces thermal and electrical energy and the design has been based on a modular approach.
AE Aurigae: First detection of non-thermal X-ray emission from a bow shock produced by a runaway star
2012
Runaway stars produce shocks when passing through interstellar medium at supersonic velocities. Bow shocks have been detected in the mid-infrared for several high-mass runaway stars and in radio waves for one star. Theoretical models predict the production of high-energy photons by non-thermal radiative processes in a number sufficiently large to be detected in X-rays. To date, no stellar bow shock has been detected at such energies. We present the first detection of X-ray emission from a bow shock produced by a runaway star. The star is AE Aur, which was likely expelled from its birthplace due to the encounter of two massive binary systems and now is passing through the dense nebula IC 405…