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An analysis of variations of innovative design for double-sided inner-coreless-stator axial-flux permanent-magnet (AFPM) generators intended for micro-wind turbine applications is presented in this paper. The 3-D finite-element field analysis proves that design variations of ironless stator with non-overlapping concentrated winding, sandwiched between two opposing steel rotor disks with embedded circumferentially-magnetized...
The local DC Power Distribution System of More Electric Aircraft has to be able to sustain bidirectional power flow to and from electromechanical devices. Because the mechanical source (Turbine Engine) is unidirectional, some storage and dissipation systems are necessary to store or/and dissipate the returned energy to maintain the DC bus voltage to the reference value. Different power management...
Leptinaemia has been poorly studied in athlete populations with the consequences of athletic hypoleptinaemia yet to be examined. Our aim was to determine if systemic leptinaemia is influenced in high body mass athletes. We recruited 24 rugby players (21.5±4.7 years; 11.8±2.9h/week) and 26 controls (22.3±3.1 years; 1.9±1.4h/week). BMD (whole body (WB), limbs, lumbar spine and non-dominant femur) and...
The aim was to evaluate a new ultrasound device in a young adult population and to assess its reproducibility via comparison to DXA measurements and geometrical measurements from high-resolution radiographs.Ninety-three subjects aged between 20 and 51years were recruited and divided into four groups according to their gender and physical activity status: 22 male athletes, 19 male controls, 21 female...
Distributed generation is becoming more and more a reality for the electric power system. One of the main problems encountered with this kind of generation is the potential formation of islands which could be feed by distributed generators even if the utility grid has failed. Many methods have been developed to detect this situation and they have been classified in three groups: passive methods, active...
Variable speed hydro power plants allow to compensate and to smooth the fluctuating wind power when feeding isolated loads. This is shown experimentally in this paper with the help of a 3 kW laboratory test bench able to emulate a hybrid wind/hydro power system. The test bench is equipped of a doubly fed induction generator based small hydro power plant emulator associated with a fixed-speed wind...
Association of wind power producing units, microhydro power plants and energy storage systems can ensure the stability of an islanded week power grid or can increase the penetration of these renewable energy sources into the large power networks. Experimental results presented in the paper demonstrate the effectiveness of this association. The microhydro power plant consists of a doubly-fed induction...
This paper reports on experimental results for a hybrid wind/micro hydro power system connected to the grid. It comprises, on one side, a doubly-fed induction generator linked mechanically and electrically (through back-to-back power electronic converters in the rotor circuit) to a permanent- magnet synchronous machine, which may recover or supply the slip power, and, on the other side, a fixed- speed...
Following a series of articles presenting the modelling and simulation of an autonomous variable- speed hydropower station feeding an isolated load or connected to a power grid ([2], [3]), this paper is aiming to validate on the test bench the solutions proposed earlier. The studied system is composed of a doubly-fed induction generator (DFIG) linked mechanically and electrically (through back-to-back...
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