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Palermo, Italy

Rabbeni R.,Viale delle Science | Tarisciotti L.,University of Nottingham | Gaeta A.,University of Nottingham | Formentini A.,University of Nottingham | And 4 more authors.
2015 IEEE Energy Conversion Congress and Exposition, ECCE 2015 | Year: 2015

This paper investigates the application of an improved Modulated Model Predictive Control strategy to active power compensators. The proposed control is able to retain all the advantages of a Finite Control Set Model Predictive Control whilst improving the waveform harmonic spectrum. In fact a modulation algorithm, based on the cost function ratio for different output vectors, is inherently included in the predictive control algorithm. In particular the case of a Shunt Active Filter is investigated and the converter topology, its analytical modeling and its control implementation are described in details. The cost function-based modulator is introduced and its effectiveness on reducing the current ripple is demonstrated. The proposed approach provides a straightforward and effective single loop control solution, maintaining an excellent dynamic performance despite the modulated output and it is self-synchronizing with the grid. Significant results obtained by experimental testing are reported and commented. © 2015 IEEE. Source


La Mantia T.,Viale delle Science
Acta Horticulturae | Year: 2015

The loquat [Eriobotryo japonica (Thumb.) Lindl.] is an allochthonous species long cultivated in Sicily. In some parts of Sicily such as the Siracusa province, the loquat is cultivated in mono-specific orchards. In other sites, like Conca d'Oro and other places near the town of Palermo, loquat is intercropped with other tree species such as citrus, apricot, peach, mulberry, walnut, Mediterranean hackberry. The loquat plays an important role in order to increase biodiversity within these orchards. The old or dead loquat trees host a variety of xylophagous insects and more in particular Coleoptera: Cerambycidae beetles Dynastidae, and Cetoniidae. Longhorn beetles, rhinoceros beetles and flower beetles are usually considered excellent indicators for woodland biodiversity and, particularly, for the wood decomposer community. However, they have never been associated to fruit orchards. Instead, in old or abandoned orchards, it is common to find live trees with dead parts or dead trees which host a rich community of decomposer insects. Today, farming changes or collapses in the urban surroundings have partly contributed to erasing this diversity. Research carried out in the past years has pinpointed that the loquat plays an important role in the preservation of different species, particularly Cerambycidae, such as: Aegosoma scabricorne, Cerambyx scopolii, Penichroa fasciata and Niphona picticornis. These species have been recorded as stable populations in many loquat orchards of the agricultural surroundings of the town of Palermo, where the presence of suitable natural environments for these beetles is rare. Some of these species are included in the red list of the sapro-xylophagous insects. Source


Alonge F.,Viale delle Science | Cirrincione M.,University of The South Pacific | Pucci M.,I-Systems | Sferlazza A.,I-Systems
2014 IEEE Energy Conversion Congress and Exposition, ECCE 2014 | Year: 2014

This paper proposes the theoretical framework and the consequent application of the input-output feedback linearization (FL) control technique to linear induction motors (LIM). LIM, additionally to RIM, presents other strong non-linearities caused by the dynamic end effects, leading to a space-vector dynamic model with time-varying inductance and resistance terms and a braking force term. This paper, starting from a recently developed dynamic model of the LIM taking into consideration its end effects, defines a FL technique suited for LIMs, since it inherently considers its dynamic end effects. The proposed approach has been validated experimentally on a suitably developed test set-up. Furthermore, it has been compared, under the same closed-loop bandwidths of the flux and speed systems, with the industrial standard in terms of high performance control technique: field oriented control (FOC). © 2014 European Union. Source


Alonge F.,Viale delle Science | Cirrincione M.,University of The South Pacific | Pucci M.,I-Systems | Sferlazza A.,Viale delle Science
2015 IEEE Energy Conversion Congress and Exposition, ECCE 2015 | Year: 2015

This paper proposes a non-linear observer for Induction Machine (IM) drives which takes into consideration the saturation effects. The non-linear observer is based on an original formulation of the dynamic model of the IM taking into consideration the magnetic saturation of the iron core. A Lyapunov based convergence analysis is proposed in order to suitably compute the observer gain guaranteeing the stability of the observer. The proposed non-linear observer has been tested in numerical simulation and experimentally on a suitably developed test set-up. Its behaviour has been compared to that obtained with a classic Full-Order Luenberger Observer (FOLO) in variable flux working conditions, in terms of accuracy of the amplitude and phase of both the rotor flux linkage and the stator currents space vectors. Results have shown the capability of the proposed non-linear observer to correctly estimate the rotor flux linkage amplitude and phase under flux varying conditions including strong variation of the saturation of the iron path with accuracy in the flux estimation much higher than that obtained with the classic FOLO. © 2015 IEEE. Source


Accetta A.,I-Systems | Alonge F.,Viale delle Science | Cirrincione M.,University of The South Pacific | Pucci M.,I-Systems | Sferlazza A.,Viale delle Science
2015 IEEE Energy Conversion Congress and Exposition, ECCE 2015 | Year: 2015

This paper presents a input-output Feedback Linearization (FL) control technique for rotating Induction Motors (IM), which takes into consideration the magnetic saturation of the iron core. Starting from a new formulation of the IM dynamic model, taking into consideration the magnetic saturation, expressed in a space-state form in the rotor flux oriented reference frame, the corresponding FL technique has been developed. To this aim, a particular care has been given to the choice of the non-linear functions interpolating the magnetic parameters vs the rotor magnetizing current curves and the corresponding magnetic characteristic. The proposed FL technique has been tested experimentally on a suitably developed test set-up and compared, under the same bandwidths of the speed and flux closed loops, with both the FL technique not taking into consideration the magnetic saturation and with the industrial standard in terms of high performance control of the IM: Field Oriented Control (FOC). © 2015 IEEE. Source

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