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Understanding commutations in switching converters. II. Analysis and synthesis of DC-DC regulators
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Metodo di controllo di un sistema di generazione di potenza elettrica basato su sorgenti di energia, in particolare sorgenti di energia rinnovabile, e relativo dispositivo controllore.
No full textFrequency domain analysis of DC-DC converters with internally controlled switching instants
No full textA Technique for Improving P&O MPPT Performances of Double-Stage Grid-Connected Photovoltaic Systems
No full textIn double-stage grid-connected photovoltaic (PV) inverters,
the dynamic interactions among the dc/dc and dc/ac stages
and the maximum power point tracking (MPPT) controller may
reduce the system performances. In this paper, the detrimental
effects, particularly in terms of system efficiency and MPPT performances,
of the oscillations of the PV array voltage, taking place
at the second harmonic of the grid frequency are evidenced. The
use of a proper compensation network acting on the error signal
between a reference signal provided by theMPPT controller and a
signal that is proportional to the PV array voltage is proposed. The
guidelines for the proper joint design of the compensation network
(which is able to cancel out the PV voltage oscillations) and of the
main MPPT parameters are provided in this paper. Simulation
results and experimental measurements confirm the effectiveness
of the proposed approach
Time-domain analysis of switching converters based on a discrete-time transition model of the spectral coefficients of state variables
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Applicazione in presenza di campo elettrico di materiali adesivi per restauro odontoiatrico
No full textGoing Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
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