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Your search keyword '"Zhao, Jingtao"' showing total 16 results
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16 results on '"Zhao, Jingtao"'

5. Small-disturbance line selection method applied to turn-adjusting arc suppression coil

Author

li Mengyue, Zhao Jingtao, Liu Mingxiang, Zheng Shu, Xia Lei, and Lei Yuan

Subjects
Computer science, Electromagnetic coil, Control theory, Turn (geometry), Point (geometry), Selection method, Line (text file), Earthing system, Symmetrical components, Arc suppression
Abstract

In the grounding system of the neutral point through the arc suppression coil, due to the compensation effect of the arc suppression coil (ASC) on the ground point fault current, the zero sequence current (ZSC) characteristic of the fault line is not obvious, which seriously affects the accuracy of single-phase ground fault line selection. Therefore, based on the analysis of the feasibility of adjusting the turn-adjusting arc suppression coil in the case of a single-phase ground fault, this paper proposes a new small-distance method to select the line technology for the turn-adjusting arc suppression coil. The results show that the method is highly reliable and practical, and can effectively improve the accuracy of line selection.

Published
2020

7. Enhancing Subsurface Diffractions Using Demigration Method.

Author

Li, Chuangjian, Zhao, Jingtao, Peng, Suping, and Lin, Peng

Abstract

Diffractions can correctly identify the geological discontinuities as they are physically reliable carriers of high-resolution structural information. However, weak diffraction waves are often masked by specular reflection waves. Therefore, we propose the methods for enhancing diffraction waves using the Kirchhoff demigration method with a dip-based weight function. As the natural asymptotic inverse of the Kirchhoff migration, the Kirchhoff demigration can be used to model the wavefield. In this study, we demonstrate the different behaviors of diffractions and specular reflections during demigration, and how this can be leveraged to suppress reflections and enhance diffractions. During demigration, reflection waves mainly originate from rays in the Fresnel zone around the stationary point. By designing a dip-based filter, these rays are suppressed to destroy reflection waves. In this way, the diffraction-only waves can be obtained even in the amplitude sharp change case. The overthrust and field data applications show the potential of this method in separating diffractions and highlighting geological discontinuities. [ABSTRACT FROM AUTHOR]

Published
2021
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9. Reliability analysis method for microgrid with intermittent distributed generations

Author

Zhang Xiaoyan, Kong Xiangyu, Liu Cheng, Sun Guocheng, Zhang Yusen, Lv Xinpeng, and Zhao Jingtao

Subjects
Engineering, Markov chain, business.industry, 020209 energy, Photovoltaic system, 02 engineering and technology, Turbine, Reliability engineering, Power (physics), Distributed generation, 0202 electrical engineering, electronic engineering, information engineering, Probability distribution, Microgrid, business, Reliability (statistics)
Abstract

The paper concerns on the reliability analysis method for microgrid with the intermittent distributed generations (DGs) and their power supply failure. Some types of DGs, such as photovoltaic and wind turbine, have the characteristic of intermittent and uncontrollable, which leads to unstable power output. It is worth to analyze and quantify the microgrid influence of DGs on the power supply reliability. In the paper, taking wind turbine as example, a multi-states power output model for intermittent DGs was provided with Markov chain. And then, a microgrid reliability analysis method, considering the influences of DGs intermittent and power supply failure, was proposed. The probability distribution of loads and power supplies are used, and a quantitative reliability indicator was given in the method, which could well reflect the microgrid reliability on various random factors. At last, an actual microgrid in Nanjing City was used to verify the feasibility and effectiveness of the proposed method.

Published
2016

12. Effect of Polarization Coulomb Field Scattering on Parasitic Source Access Resistance and Extrinsic Transconductance in AlGaN/GaN Heterostructure FETs.

Author

Yang, Ming, Lin, Zhaojun, Zhao, Jingtao, Cui, Peng, Fu, Chen, Lv, Yuanjie, and Feng, Zhihong

Subjects
POLARIZATION (Electricity), ELECTRIC properties of gallium nitride, ELECTRIC properties of aluminum gallium nitride, LOGIC circuits, BAND gaps
Abstract

With the measured parasitic source access resistance under a different forward gate–source current for the AlGaN/GaN heterostructure FETs (HFETs) with different device sizes, the variation of the measured parasitic source access resistance with the polarization charge distribution at the AlGaN/GaN interface was compared and analyzed. It is found that the variation of the parasitic source access resistance originates from the polarization Coulomb field (PCF) scattering, and the effect of PCF scattering on the parasitic source access resistance is more significant for the device with a longer gate length or a shorter gate–source distance. The behaviors of the measured extrinsic transconductance for the fabricated AlGaN/GaN HFETs confirm the effect of PCF scattering. The possibility is demonstrated to take advantage of this effect to improve the performance of AlGaN/GaN HFETs. [ABSTRACT FROM AUTHOR]

Published
2016
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