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- 저자 : Yufei Tang (검색결과 3 건)
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Xin Tang,Zhen Li,Yang He,Liyang Wang,Yufei Yue,Wen Wang 전력전자학회 2023 JOURNAL OF POWER ELECTRONICS Vol.23 No.2
In the stability analysis of DC (direct-current) power grids, AC (alternating current)/DC converters are usually treated as linear proportional amplifiers or inertial links. However, this approximation will have a considerable effect on the DC-side impedance model of a constant active power control converter and then affect the accuracy of the stability analysis of DC grids. In this paper, in view of the DC-side of the voltage fluctuations, the DC-side admittance model is established after the nonlinear relationship between the port voltage and the modulation signal function is determined. A comparison is made between the traditional modeling method and the proposed modeling method in the analysis of the phase–frequency characteristics and amplitude–frequency characteristics of the admittance. Results show that the proposed small-signal model can better fit the measured admittance in the low-frequency bands. The proposed admittance model in this paper is further applied to assess the small-signal stability of a DC grid. Finally, PSCAD/EMTDC simulation and lab-scaled prototype experiment are used to verify the correctness and effectiveness of the established admittance model. Results show that the small-signal model deduced in this paper can better fit and measure the admittance in the low-frequency band, and can more accurately judge the stability of the DC system.
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Mengchen Mao,Yufei Tang,Kang Zhao,Zihao Duan,Cong Wu 대한금속·재료학회 2019 METALS AND MATERIALS International Vol.25 No.2
Porous titanium scaffolds with aligned lamellar pore channels and smooth inner walls were fabricated by directional freezecasting using aqueous TiH2slurries. The formation of dendrites was inhibited by increasing the TiH2content in slurry. Thepore structures and compression strengths of porous titanium scaffolds that were made with different solid contents werecharacterized. The formation mechanism of aligned lamellar pore channels and the reason for the improvement of compressionstrength were analyzed. With increasing TiH2content in slurry, the open porosity reduced from 38.57 to 29.03% whilelamellar spacing decreased. Young’s modulus was decreased with the increasing open porosity. Directional lamellar porechannels were obtained by controlling the TiH2content in slurry, which can reduce the number of branches and preventstress concentrations during compression. Also, the porous titanium scaffolds prepared by this process had a good biocompatibilitywith osteoblasts.
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SF6 abatement in a packed bed plasma reactor: Role of zirconia size and optimization using RSM
Yuan Tian,Xiaoxing Zhang,Yufei Wang,Zhaolun Cui,Ju Tang 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.94 No.-
This work describes plasma destruction of SF6 in a zirconia (ZrO2) packed bed plasma reactor (PBR). Electric signals, equivalent parameters, emission spectra and degradation results have been utilized toevaluate the influence of ZrO2 size on PBR discharge characteristics and SF6 degradation. The resultspresent that the size of ZrO2 has a significant impact on PBR discharge characteristics due to its influenceon physical parameters. Moreover, bigger ZrO2 beads packing shows a better performance in SF6degradation because of longer gas residence time. In addition, the key operating parameters includingflowrate, SF6 concentration, oxygen concentration, and water vapor concentration were optimized byresponse surface methodology (RSM) with Box-Behnken design (BBD). The proposed optimization modelshows satisfactory correlation between the predicted and actual results. For energy yield (EY), the mutualeffect offlowrate, SF6 concentration and water vapor concentration was significant. For SO2F2 selectivity,the mutual effect of SF6 concentration and water vapor concentration was significant. The optimum SF6abatement was predicted from RSM as 14.64 g/kWh and 14.42% for EY and SO2F2 selectivity atflowrate of200 mL/min, SF6 concentration of 3%, oxygen concentration of 0.83% and water vapor concentration of1.89%.
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