MESTRINER , Daniele

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Microgrids (MGs) represent surely the most challenging topic in electrical engineering, promising the decreasing of carbonization, the totally integration of different renewable sources and a cheap solution for those rural areas where electric distribution is economically unsustainable. The most important feature of a MG is represented by the...

Lightning induced voltages on overhead power lines are calculated in this paper by using different return stroke engineering models for the evaluation of electromagnetic fields. Agrawal formulation is used for field-to-line coupling equations and Cooray-Rubinstein correction is applied in order to include the impact of the finitely conducting...

Microgrids (MGs) may represent a new answer to many old problems in energy and electric world, such as pollution, high reliability, efficiency and so on. The MG rapid increase implies a fast transformation of the electric power systems that are now characterized by new energy sources requiring dedicated control architectures and simulation...

One of the main issues that has to be faced when evaluating lightning-induced overvoltages on a realistic network configuration is to implement the algorithm that solves the field-to-line coupling problem into an electromagnetic simulator that is able to represent with a high level of detail all the power system components. On one hand,...

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Lightning overvoltages are one of the most dangerous factors affecting the power quality of a distribution grid. In medium voltage (MV) overhead distribution systems, lightning transients can be caused by either direct or indirect strikes. Indirect strikes are much more frequent than direct strikes and can cause flashovers, especially when the...

The increasing interest in Microgrids (MGs) leads to the research of more efficient control methods and claims for new methods to assess the obtained working points stability. As the majority of renewable sources are connected to the MG by means of power electronic converters, it is often impossible to replicate some of the concepts, tools and...

Nuclear fusion represents in the current century one of the most important challenges in the energy field. Achieving such an important goal will completely change the energy scenario and it will reduce the current dependency on fossil fuels with a sustainable alternative. In this framework, ITER project represents the most advanced project for...

The Fourier transform (FT) of the electric field (EF) radiated by a lightning return stroke is shown to include a distributional term at zero frequency, which prevents numerical algorithms, such as fast FT, from working properly. Inspired by the finite duration of any field measurement in real applications, we introduce a time-windowing...

Wind turbines (WTs) can be seriously damaged by lightning strikes and they can be struck by a significant number of flashes. This should be taken into account when the WT lightning protection system is designed. Moreover, WTs represent a path for the lightning current that can modify the well-known effects of the lightning discharge in terms...

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The electromagnetic lightning field is usually computed by considering a model consisting in a vertical and rectilinear channel, as well as a Transmission-Line (TL) type propagation characterized by an attenuation function, which expresses how the current decreases while it travels upward along the lightning channel. When dealing with realistic...

The behavior of the return-stroke current along the lightning channel is extremely important for the evaluation of the electromagnetic fields radiated at various distances, since such fields may cause disturbances or faults on electric and electronic equipment. It is commonly known that lightning current attenuates while propagating along the...

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In the present paper, we show, by means of numerical simulations, that electromagnetic field data obtained from the radiation of a return-stroke lightning discharge and measured over a short-duration time-window can be exploited to reconstruct the attenuation function of the lightning channel. To this end, we discretize the current-field...

The present paper presents the results of the comparison between a recently developed code for the evaluation of lightning-induced overvoltages in the PSCAD-EMTDC environment and the measurements on an experimental facility developed at the University of São Paulo, São Paulo, Brazil. The extensive validation campaign is performed considering...