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An electro-mechanical model of a SF6 circuit breaker for medium voltage applications, i.e. for voltages up to 36 kV and short circuit currents up 50 kA is presented. The model is developed by starting from the well known Schwarz-Advonin arc model with the addition of the mechanical effects on the arc geometry and of the “puffer”. The puffer can blow the arc during its full duration and mainly during...
The impact of electrical vehicles spread on electricity networks and on mobility from a general point of view, is one of the most topical questions during these years. The key point is to predict autonomies in order to understand what will be the new requirements. This means to tie driver's driving habits and styles, with the actual driving cycles, in order to assess the behavior of the battery and...
In the near future Electrical Vehicless (EVs) will most likely replace conventional combustion-engine based ones. This and the increase in the use of renewable energy sources will have an important positive impact on our ecosystem. At the same time it will require a serious reanalysis and possibly redesign of the structure of our distribution network. In this paper we propose a model that, at a relatively...
This work focuses on interactions between wave energy converters (WEC) in array configuration. The arrays are simulated in the time domain by a coupled hydrodynamic-electromagnetic model. The hydrodynamic parameters of the model are estimated by boundary element code while the electrical ones are obtained by finite element code. Wave parks of two and four devices are simulated considering different...
This paper presents the implementation of a real-time predictive power management strategy in a light commercial power-split hybrid electric vehicle (HEV). The control outline was designed in a more intuitive way, avoiding rigorous mathematical description for predictive strategies, with a practical receding horizon insight. Therefore, a priori knowledge of the driving cycle is not required and the...
This paper presents a comparison among two types of linear generators for wave energy conversion: an inner-permanent-magnet-slotted-tubular-linear-generator (IPM-STLG) and an outer-permanent-magnet-slotless-tubular-linear-generator (OPM-STLG). The magnetic and electric quantities are extracted and evaluated using Finite Element Method Magnetics (FEMM) software and Matlab. These quantities include...
The use of optimization algorithm for the management of energy on vehicles electrical, is an innovative argument in the field of the transports. In this context, beginning from an accurate model of electrical device, is necessary to identify the performances so as to reproduce the physical behavior of the considered vehicle. Particularly it is necessary to start from a model that takes into account...
The paper presents the preliminary design and modelling of a point absorber wave energy converter consisting of a floating buoy connected to a tubular linear generator fixed at the seabed. The behaviour of the device is described by the equation of motion of a single body system restricted to vertical motion. The model of the coupled buoy-generator system is used to simulate the behaviour of the wave...
Subsidy reduction and the increased importance of photovoltaic energy generation have triggered the need to develop accurate approaches to measure, estimate and possibly forecast energy production with the goal of enabling early detection and diagnosis of parametric faults before they become catastrophic and lead to partial or full shut down of the plant. Moreover the ability of accurately predicting...
Layouts of domestic photovoltaic solar plants can be problematic due to obstacles that shade panels. This limits the total available area and, if not adequately considered, can deeply affect the efficiency of the plant. In this paper, a circuit that recovers generated power efficiency when a small number of cells of a panel are partially or totally shaded is proposed. This circuit is constituted by...
A micro-inverter that takes as input the DC power generated by a solar panel (about 250W) and delivers it directly as AC power to the mains line is presented. The micro-inverter has been designed with discrete components, as it is common practice, since there are no silicon technologies that can be used to integrate the complete circuit and the passive components. The proposed micro-inverter has been...
This paper proposes a novel electrical power system architecture capable to efficiently transfer energy from a solar generator to high power electric thrusters of a spacecraft. The architecture is based on a maximum power point tracker that acts on a DC/DC converter connected between a subsection of the solar generator and the thrusters. The other sections of the solar generator, that deliver most...
In recent years the increase of massive connections of renewable systems to power grid has highlighted the need to address stability issues with ad-hoc techniques. On the other side, the complexity of electronic devices requires an integrated approach for the different layers of the system, especially in terms of power quality. This task is often supported by advanced soft computing techniques that...
The aim of this paper is to compare different architectures for a power system that supplies electrical thrusters for future space exploration missions. The main goal of these architectures is the maximization of the power extracted from the solar arrays in all operational situations and this is possible only by using peak power tracking algorithms. This limits the choice of architectures only to...
This paper will present a novel approach to the design of wireless energy transfer devices, by means of a recently developed evolutionary optimization method. This approach is well suited in order to increase the transfer efficiency and the robustness of the coupling, with the aim of minimizing the average power loss.
Inductive links is the most popular solution to wirelessly send power and data from an external transmitter to implantable biomedical device. This paper proposes the optimized design of a wireless energy transfer devices, by means of an evolutionary optimization method. This procedure is developed in order to increase the transfer efficiency and the robustness of the coupling, with the aim of minimizing...
The probe-based harmonic balance (HB) method is a well-known and largely used tool to compute the steady state behavior of autonomous circuits (oscillators). In this paper, the method is extended to analyze coupled oscillators, where the working frequencies and conditions, i.e., pulling and locking modes, have great relevance. It is shown that probe insertion can be considered as a specific matrix-bordering...
This paper provides a novel approach to the design of wireless energy transfer devices, by means of an hybrid evolutionary optimization method, the recently developed Genetical Swarm Optimization. This approach is well suited in order to increase the transfer efficiency and the robustness of the coupling, with the aim of minimizing the average power loss.
With the appreciating of problems related to the environmental impact evaluation of human activities, wireless sensor networks (WSNs) are emerging as suitable monitoring systems for large geographical areas, fixing new challenges in many scientific areas such as computer science, wireless communication and energy harvesting. In recent years tubular permanent magnet linear generators (TPM-LiG) have...
Hybrid stepper motors combine the features of permanent magnet and variable reluctance motors, which makes them an attractive solution for a variety of low-cost applications. Oscillations in the phase current and in the motor position may however arise between two consecutive steps. This paper develops a model of the system, whose linearization yields closed form analytical expressions of the parameters...
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