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Xu Tian,Qirong Jiang,Yingdong Wei,Junmin Zhang,Yitao Wei 전력전자학회 2015 ICPE(ISPE)논문집 Vol.2015 No.6
Phase sequence commutating method among traction feeders results in a neutral section without power supply between two feeders in traction substation of electrified railway. Electric locomotives suffer from a nopower time of more than 100 millisecond when going through the neutral section, during which the power failure and restoration process causes serious over-voltage and over-current problems. A novel railway uninterruptible flexible connector based on two-phase modular multilevel converter structure(MMC-UFC) is proposed in this paper, which can completely eliminate power supply dead zone. System utilization and operational principle are analyzed. Mathematical model of MMC-UFC is built to derive the difference between MMC-UFC. Double close-loop control strategies are given and close-loop control of both upper arm current and lower arm current for MMC converter is proposed to ensure the quality of output current. PSCAD/EMTDC simulations and experiment are carried out to prove the effectiveness of proposed MMC-UFC and its control system.
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Shuo Kang,Zhikui Yu,Qirong Tian,Minghui Tai,Jiaoying Wang,Dalai Jin,Longcheng Wang 대한금속·재료학회 2022 ELECTRONIC MATERIALS LETTERS Vol.18 No.6
In this work, YBO3phosphors doped with Ln3+(Ce3+, Tb3+,Eu3+)ions were synthesized by a facile hydrothermal methodusing high temperature and high pressure environment. Structural property characterizations show all the samples have asimilar spherical morphology and a hexagonal crystal structure with good crystallinity. PL spectra and CIE calculation showthat the color of phosphors can be easily controlled by the species and atomic content of Ln3+ions. White color is achievedas the atomic contents of Ln3+ions are: 1% Ce3+,3% Tb3+,and 0.5% Eu3+,respectively. Furthermore, LED devices basedon ultraviolet chip were fabricated and characterized, and the results clearly demonstrated the tunable color of as-preparedphosphors. At the same time, co-doping Ce3+,Tb3+,and Eu3+ions can well adjust the fluorescence lifetime of the threerare earth ions through energy transfer. These results show that the phosphor has broad application prospects in the field ofdisplay lighting such as LED.
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