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RISS 인기검색어
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- 저자 : Liu Zhipei (검색결과 3 건)
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Lingling Xie,Zhipei Liu,Bo Zhang 대한전기학회 2020 Journal of Electrical Engineering & Technology Vol.15 No.4
Fractional defnition is important for the application of fractional-order theory in electrical engineering, and fractional-order theory directly afects the accuracy of the model and the operating characteristics of the power converter. Most researchers used the fractional defnition of Caputo to study fractional order power converter. However, it is found that the model based on Caputo fractional defnition is inconsistent with the actual situation. A novel modeling and analysis method for the fractional buck–boost converter is proposed in this paper. Firstly, the fractional converter model operating in continuous conduction mode (CCM) is established and the DC analysis is completed by using Riemann–Liouville (R–L) fractional defnition. The R–L fractional defnition is nearly 1.1% more accurate than the Caputo defnition in the DC analysis. Secondly, the infuence of the capacitor and inductor orders on the converter is performed. The results show that the capacitor and inductor orders have great efect on the DC components of the state variable and the steady-state characteristics of the fractional order buckboost converter. Finally, simulation and experiment results are provided that the validity of theoretical analysis.
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Fractional-Order Adaptive Sliding Mode Control for Fractional-Order Buck-Boost Converters
Xie Lingling,Liu Zhipei,Ning Kangzhi,Qin Rui 대한전기학회 2022 Journal of Electrical Engineering & Technology Vol.17 No.3
In previous studies, the combination of fractional calculus (FC) and sliding-mode control (SMC) has been gaining more and more interest due to fusion characteristics of SMC and FC. But most study integer-order buck converters, and few study control strategies of fractional-order converters. In this paper, the sliding mode controller and fractional adaptive sliding mode controller for fractional-order buck-boost converters are proposed. An affi ne nonlinear system model of the fractionalorder buck-boost converter is built. Based on the diff erential geometry theory, the exact feedback linearization is performed on the affi ne nonlinear model of the fractional-order buck-boost converter. On this basis, a fractional adaptive sliding mode controller is designed by selecting a linear sliding surface and adaptive control law. The stability of the fractional controller is proved by the Mittag–Leffl er stability theorem. The simulation results show that the fractional adaptive sliding mode control has good dynamic response performance and small steady-stage error regulating characteristics. Compared with traditional sliding mode control and PI λ control, the control method demonstrates stronger robustness under various disturbances.
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Vapour–liquid–solid growth of monolayer MoS<sub>2</sub> nanoribbons
Li, Shisheng,Lin, Yung-Chang,Zhao, Wen,Wu, Jing,Wang, Zhuo,Hu, Zehua,Shen, Youde,Tang, Dai-Ming,Wang, Junyong,Zhang, Qi,Zhu, Hai,Chu, Leiqiang,Zhao, Weijie,Liu, Chang,Sun, Zhipei,Taniguchi, Takaaki,Os Nature Publishing Group UK 2018 Nature Materials Vol.17 No.6
<P>Chemical vapour deposition of two-dimensional materials typically involves the conversion of vapour precursors to solid products in a vapour-solid-solid mode. Here, we report the vapour-liquid-solid growth of monolayer MoS2, yielding highly crystalline ribbons with a width of few tens to thousands of nanometres. This vapour-liquid-solid growth is triggered by the reaction between MoO3 and NaCl, which results in the formation of molten Na-Mo-O droplets. These droplets mediate the growth of MoS2 ribbons in the 'crawling mode' when saturated with sulfur. The locally well-defined orientations of the ribbons reveal the regular horizontal motion of the droplets during growth. Using atomic-resolution scanning transmission electron microscopy and second harmonic generation microscopy, we show that the ribbons are grown homoepitaxially on monolayer MoS2 with predominantly 2H-or 3R-type stacking. Our findings highlight the prospects for the controlled growth of atomically thin nano-structure arrays for nanoelectronic devices and the development of unique mixed-dimensional structures.</P>
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