Current Issue : April - June Volume : 2016 Issue Number : 2 Articles : 5 Articles
This work, based on the junction recombination velocity (Sfu) concept, is used to study the solar\ncell�s electric power at any real operating point. Using Sfu and the back side recombination velocity\n(Sbu) in a 3D modelling study, the continuity equation is resolved. We determined the photocurrent\ndensity, the photovoltage and the solar cell�s electric power which is a calibrated function of\nthe junction recombination velocity (Sfu). Plots of solar cell�s electric power with the junction recombination\nvelocity give the maximum solar cell�s electric power, Pm. Influence of various parameters\nsuch as grain size (g), grain boundaries recombination velocity (Sgb), wavelength ()\nand for different illumination modes on the solar cell�s electric power is studied....
This paper presents a high efficiency Doherty power amplifier suitable for TV band applications. A\nclass AB power amplifier is firstly implemented using a commercial GaN HEMT from Cree Incorporation,\nachieving a high power-added-efficiency of 77.78% and a 40.593 dBm output power with\nan associated gain of 21.65 dB. The Doherty amplifier has then been designed following the previous\nclass AB scheme for the main amplifier and a class C scheme for the peak one. This amplifier\nattained a high power-added-efficiency of 81.94%, a 42.77 dBm output power, an associated gain\nof 21.32 dB, and an operating frequency bandwidth between 550 and 1000 MHz (58.06% fractional\nbandwidth) which made it suitable for TV band applications....
When the line impedance is considered in the\nmicrogrid, the accuracy of load sharing will decrease. In\nthis paper, the impact of line impedance on the accuracy of\nload sharing is analyzed. A robust droop control for a high voltage\nmicrogrid is proposed based on the signal detection\non the high-voltage side of the coupling transformer. For a\nhigh-voltage microgrid, the equivalent impedance of coupling\ntransformer connecting distributed generator with the\ngrid is usually the dominate factor. Compared with the\nconventional droop control strategy, the proposed control\nmethod in this paper detects the feedback signal from the\nhigh-voltage side of the coupling transformer. The impact\nof line impedance on the load sharing accuracy can be\nmitigated significantly. The proposed droop control only\nchanges the detection point of the feedback signal, thus it is\neasy to be implemented. The PSCAD/EMTDC simulation\nresults show the effectiveness of the proposed robust droop\ncontrol concept in load sharing and voltage regulation with\nhighly accuracy....
This paper investigates the performance of a near field wireless power transfer\nsystem that uses curved relay resonator to extend transfer distance. Near field wireless power\ntransfer operates based on the near-field electromagnetic coupling of coils. Such a system can\ntransfer energy over a relatively short distance which is of the same order of dimensions of the\ncoupled coils. The energy transfer distance can be increased using flat relay resonators. Recent\ndevelopments in printing electronics and e-textiles have seen increasing demand of embedding\nelectronics into fabrics. Near field wireless power transfer is one of the most promising\nmethods to power electronics on fabrics. The concept can be applied to body-worn textiles by,\nfor example, integrating a transmitter coil into upholstery, and a flexible receiver coil into\ngarments. Flexible textile coils take on the shape of the supporting materials such as garments,\nand therefore curved resonator and receiver coils are investigated in this work. Experimental\nresults showed that using curved relay resonator can effectively extend the wireless power\ntransfer distance. However, as the curvature of the coil increases, the performance of the\nwireless power transfer, especially the maximum received power, deteriorates....
This paper is about the design of a power quality monitoring system based on LabVIEW for factory power quality defined in the IEEE Standard 1459-2010 for single-phase, three phase three-wire and three-phase four-wire power systems. With LabVIEW as development platform, composed by some functional modules such as data acquisition, data processing, data storage, and data report, etc. defined in International standards concerning electrical power quality Standard EN 50160. This system has advantages of better analyzed affection and low cost, and can be extended easily....
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