Current Issue : July - September Volume : 2019 Issue Number : 3 Articles : 5 Articles
In this paper, simulation and implementation way for practical control of\nSingle Inverter Microgrid (SIMG) is presented. This system is equipped by\nsolar system, wind energy conversion system (WECS), and microturbine system.\nEach DGâ??s has controlled independently. This is a kind of decentralize\ncontrol because each DGâ??s has difference controller. Control of Microgrid\n(MG) during both grid tie and islanding modes is presented. Solar system and\nWECS are modeled based on santerno products. This system is compared\nwith three inverter MGs with Centralize control strategy. Controlled signals\nshow that SIMG is more reliable and economical. THD is improved and\nstrategy is simplified for SIMG....
This paper investigates the application of the axial flux machine (AFM) to the\nwind energy conversion systems (WECS) to obtain high power and torque at\nreduced cost. By developing mathematical equations using the phase and active\ntransformations, the three-phase model is transformed to two-phase equations\nby making both the stator and rotor as reference frames, finally converting\nto arbitrary reference frame, which is useful for the modelling of the\naxial flux machine. The torque, current, and voltage equations are expressed\nto improve the simulation reliability. Based on the developed equations, the\nmathematical model for the axial flux machine is developed using the\nMATLAB/Simulink. Starting with the axial flux motor model, when the load\non the motor increases, how the parameters like torque, current, and speed of\nthe motor vary are explored in this paper. Then for the axial flux generator\nmodel, when the wind speed exceeds the rated speed how the torque, line\nvoltages, currents, power and speed of the generator behave are investigated\nand presented in this paper. The developed model in this paper could be extended\nto a twin-rotor axial flux synchronous machine, which will lead to the\ndevelopment of more efficient WECS....
Ice throw is a significant risk factor in the vicinity of wind turbines located in cold\nclimate areas. We present a method to estimate the ice chunk trajectories. First, similar to the\ncommon practice, only translation is accounted for and the object trajectory is determined by\ngravity and the aerodynamic drag force. The sensitivity of the trajectories to the launch positions,\nwind speed, turbine rotation and aerodynamic drag is assessed. Next, trajectory computations with\nsix-degree-of-freedom motion are presented. The required aerodynamic forces and moments are\nprecomputed using CFD. The results indicate that object rotation might be non-negligible when\nhigher accuracy is needed for the trajectory estimates....
This paper presents the method of using glass fibre with carbon deposit (GFCD), derived from the recycling of wind turbine\nblades, for production of composite materials based on poly(vinyl chloride) (PVC). Composite materials containing from 1 to 15\nwt% of GFCD were produced by plasticising with a plastographometer and then by pressing.The processability and performance\nwere studied. Mechanical properties in static tension, impact strength, and thermal stability were determined. Glass transition\ntemperature was also determined by means of the dynamic mechanical thermal analysis (DMTA). The GFCD percentage of up\nto 15 wt% was found not to slightly affect the change in the processability, thermal stability, and glass transition temperature.\nPVC/GFCD composite materials are characterised by a definitely greater elastic modulus with simultaneous decrease of tensile\nstrength and impact strength. An analysis with scanning electron microscopy revealed good adhesion between the filler and the\npolymer matrix....
This paper summarizes wind turbines of Swedish origin, 50 kW and above. Both the large\ngovernmental-funded prototypes from the early 1980s and following attempts to build commercial\nturbines are covered. After the 1973 oil crisis, a development program for wind turbine technology\nwas initiated in Sweden, culminating in the early 1980s with the 2 and 3-MW machines at Maglarp\nand Näsudden. However, government interest declined, and Sweden soon lost its position as one of\nthe leading countries regarding wind turbine development. Nevertheless, several attempts to build\ncommercial wind turbines in Sweden were made in the following decades. Most attempts have, like\nthe earlier prototypes, used a two-bladed rotor, which has become synonymous with the Swedish\nwind turbine development line. The current ongoing Swedish endeavors primarily focus on the\nniche-concept of vertical axis wind turbines (VAWTs), which is a demonstration of how far from the\nbroad commercial market of Sweden has moved. Thus far, none of the Swedish attempts have been\ncommercially successful, and unlike countries like Denmark or Germany, Sweden currently has no\nlarge wind turbine producer. Suggested reasons include early government interventions focusing on\ntwo-bladed prototypes and political disinterest, with wind power grants cut in half by 1985, and the\ndomestic industry not being favored in government policies for deploying wind power....
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