Examinando por Autor "Formisano, Alessandro"
Mostrando 1 - 2 de 2
- Resultados por página
- Opciones de ordenación
Ítem Impact of nearby lightning on photovoltaic modules converters(Emerald, 2021-09-21) Barmada, Sami; Formisano, Alessandro; de-la-Casa-Hernández, Jesús; Sánchez-Sutil, Francisco; Petrarca, CarloThe lightning phenomenon is one of the main threats in photovoltaic (PV) applications. Suitable protection systems avoidmajor damages fromdirect strikes but also nearby strikesmay induce overvoltage transients in themodule itself and in the power conditioning circuitry, which can permanently damage the system. The effects on the PV system sensibly depend on the converter topology and on the adopted power switch. In the present study, a comparative analysis of the transient response due to a nearby lightning strike (LS) is carried out for three PV systems, each equipped with a different converter, namely, boost, buck and buck–boost, based on either silicon carbide metal oxide semiconductor field effect transistors (SiC MOSFET) or insulated gate bipolar transistors controlled power switch devices, allowing in this way an analysis at different switching frequencies. The purpose of this paper is to present the results of the numerical analysis to help the design of suited protection systems.Ítem Modeling of PV Module and DC/DC Converter Assembly for the Analysis of Induced Transient Response Due to Nearby Lightning Strike(MDPI, 2021-01-08) Formisano, Alessandro; de-la-Casa-Hernández, Jesús; Petrarca, Carlo; Sánchez-Sutil, FranciscoPhotovoltaic (PV) systems are subject to nearby lightning strikes that can contribute to extremely high induced overvoltage transients. Recently, the authors introduced a 3D semianalytical method to study the electromagnetic transients caused by these strikes in a PV module. In the present paper we develop an improved model of the PV module that: (a) takes into account high-frequency effects by modelling capacitive and inductive couplings; (b) considers the electrical insulation characteristics of the module; (c) includes the connection to a DC/DC converter. The whole process involves three major steps, i.e., the magnetic-field computation, the evaluation of both common-mode- and differential-mode-induced voltages across the PV module, and the use of the calculated voltages as input to a lumped equivalent circuit of the PV module connected to the DC/DC converter. In such a framework, the influence of the PV operating condition on the resulting electrical stresses is assessed; moreover, the relevance or insignificance of some parameters, such as the module insulation or the frame material, is demonstrated. Finally, results show that the induced overvoltage are highly dependent both on the grounding of the conducting parts and on the external conditions such as lightning current waveforms and lightning channel (LC) geometry.