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121 results on '"Liu, Hongshun"'

107. Secondary Arc Characteristics and Single-phase Autoreclosure Scheme of UHV Transmission Line with Hybrid Reactive Compensation

Author

Lu Tingting Lu Tingting, Li Bin, Li Qingquan, Liu Hongshun, Li Runchang Li Runchang, and Li Songyan Li Songyan

Subjects
Arc (geometry), Engineering, Electric power transmission, Laplace transform, Basis (linear algebra), business.industry, Control theory, Transmission line, Transient (oscillation), business, Fault (power engineering), Compensation (engineering)
Abstract

In order to study the secondary arc characteristics of single-phase transient fault in UHV transmission lines with hybrid reactive compensation, a transmission line electromagnetic coupling model is presented in this paper. Dynamic model of secondary arc was established on the basis of improved Mayer equation. Based on the transient simulation and the method of Laplace transform the law of secondary arc characteristics in UHV transmission lines with hybrid reactive compensation was obtained. With different compensation degrees of series compensation and controlled shunt reactor, as well as ground fault location, we can find secondary arc current almost increases linearly with the increase of series compensation degree and decreases linearly and then increases with the increase of the controlled shunt reactor compensation degrees. Based on the specific compensation device configuration scheme, a time sequential control strategy between the bypass switch and single-phase autoreclosure were given, which will provide a theoretical guidance for practical application.

Published
2016

120. MOA-based FCL and Its Application in Power System

Author

Ma Yuan, Sun Shumin, Zou Liang, and Liu Hongshun

Subjects
Electric power system, Total harmonic distortion, Engineering, Surge arrester, business.industry, Harmonics, Voltage sag, Fault current limiter, Electronic engineering, Power-system protection, Fault (power engineering), business, Automotive engineering
Abstract

With regard to power system installed with zinc oxide (ZnO) surge arrester (MOA) based FCLs, the influence of the FCLs on safety operation and power quality is analyzed detailed by MATLAB simulations. Firstly, the impact of different current limit factors on voltage sags of bus line and the current of branch circuits during a three phase fault is investigated. Secondly, this paper presents the change of the harmonic ratio and total harmonic distortion with different current limit factors at normal conditions. Simulation results show that the installation of MOA-based FCLs in power system, not only can limit the fault current and reduce the voltage sags when a fault occurs but also can restrain the transfer of high-frequency harmonics in normal situations.

Published
2008

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