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7. A Multilayer Three-Phase Coaxial HTS Cable With Large Capacity and Low Loss.

Author

Huang, Zhenghao, Wang, Yinshun, Lu, Xuchen, Zhang, Xindan, Li, Guanhua, and Wang, Lecheng

Subjects
COAXIAL cables, HIGH temperature superconductors, CABLES, SUPERCONDUCTING cables
Abstract

With the challenge of space size in urban densely populated areas and the increase in power demand, three-phase coaxial high temperature superconducting (HTS) cable has an attractive prospect in its compact structure and low loss. In order to minimize the proximity-effect among conductors of the same phase when the layers per phase increase, a new structure of cable composed of many three-phase groups is proposed, which decomposes the superconducting layers into many magnetically independent three-phase groups. Each three-phase group contains three-phase conductors composed of one or two layers per phase. The ac losses between the proposed and conventional HTS cables are compared by means of an analytical solution. The result shows that the new architecture greatly reduces the ac loss, and the efficiency of reducing loss is enhanced with the increase of layers. Therefore, the proposed cable is expected to replace the copper cables in some mid- or low-voltage levels and high-current conditions. [ABSTRACT FROM AUTHOR]

Published
2022
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8. Research on Detection of Gas Components in Insulation Fault Characteristics of Air Switch Cabinet

Author

Lu Xuchen, Liu Jiaxin, Li Shuang, BI Haitao, Hu Yiwen, and Yang He

Subjects
Electric power system, Flow (psychology), Partial discharge, Cabinet (file format), Fluid dynamics, Environmental science, Gas composition, computer.file_format, Atmospheric model, Fault (power engineering), computer, Automotive engineering
Abstract

In this paper, the fault discrimination method of GIS equipment is studied, and a method for detecting the gas composition of the insulation fault characteristic in the air switch cabinet is proposed. First, analyze the decomposition mechanism of partial discharge air in the air under the condition of insulation fault, determine the characteristic gas of insulation fault as the detection object, and analyze the influencing factors that affect the characteristics of the characteristic gas. Then establish a simulation model for the air switch cabinet, analyze the flow characteristics of the indoor gas, and establish the installation position of the characteristic gas detection sensor on this basis.

Published
2020

9. Research on Distribution Network Optimization with Distributed Generation

Author

Chen Hao, Liu Hengyu, Wang Wei, Lu Xuchen, Guo Tie, and Wei Defu

Subjects
Imagination, Extremal optimization, Mathematical optimization, Distribution (number theory), business.industry, Computer science, media_common.quotation_subject, Node (networking), Distributed power, AC power, Distributed generation, business, media_common, Voltage
Abstract

Distributed generation access to distribution network will change its power flow and node voltage distribution, which may affect the safe and stable operation of distribution network. In this paper, the minimum active power loss is taken as the objective to model the distribution network with distributed generations, and the extremum optimization algorithm is introduced to improve it. Finally, an example is given to verify the superiority of the improved algorithm over other typical optimization algorithms.

Published
2019

10. Parallel Inverter Circulating Current Suppression Method Based on Adaptive Virtual Impedance

Author

Wang Wei, Chen Hao, Guo Tie, Lu Xuchen, Liu Hengyu, and Wei Defu

Subjects
Power loss, business.industry, Computer science, Lead impedance, Electrical engineering, Circulating current, Inverter, Output impedance, Equivalent impedance transforms, Virtual impedance, business, Power (physics)
Abstract

In practice, the output impedance and lead impedance of the parallel inverter are often inconsistent, and the inconsistency of the equivalent impedance also causes uneven power between the inverters. In this thesis, the parallel inverter system circulating current is analyzed, and the output impedance inconsistency problem is improved by adaptive virtual impedance. The virtual impedance is different from the actual output impedance, which can optimize the power sharing problem without introducing additional power loss.

Published
2019

11. Discriminate Method of Power Frequency Ferroresonance in System with Non-Effectively Earthed Neutral of Three-Phase Enclosed GIS

Author

Liu Jiaxin, Wei Defu, Lu Xuchen, Tang Jianeng, and Wang Yanan

Subjects
Inductance, Materials science, Three-phase, Ferroresonance in electricity networks, Cascade, Electromagnetic coil, Control theory, Overvoltage, 020209 energy, 0202 electrical engineering, electronic engineering, information engineering, Equivalent circuit, 02 engineering and technology, Arc suppression
Abstract

Ferroresonance overvoltage is one of the most important factors to impact electric equipment inner insulation. In system with non-effectively earthed neutral, the equipment damage caused by ferroresonance overvoltage possesses great proportion. This paper derives the criterion of power frequency ferroresonance in system with non-effectively earthed neutral in detailed, in order to conveniently judge whether there is power frequency ferroresonance when system transferring working mode. This criterion derives the relation between equivalent circuit resistance and critical resistance using analytical method and can be used for determining the zero sequence resistance value in cascade with PT secondary side for eliminating ferroresonance. The method is verified by an example under two conditions. Finally, the effect of neutral connecting arc suppression coil on ferroresonance is analyzed.

Published
2018

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