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| 1 | Impacts of Large-scale Wind Power Grid Integration on Relay Protection and Countermeasures显示文摘Several large-scale wind turbine tripping accidents occurred in Jiuquan wind power base in 2011.According to the on-site survey and analysis of these accidents related to relay protection,causes were found to be the collection system defects and low correct operation rate of small current grounded line selectors of the unearthed neutral point collection system.By referring to both the characteristics of Jiuquan wind power base and arrangement of relay protection,the short-circuit features of wind power and its impacts on relay protection are analyzed.The collection system and the retrofit of the small current grounded line selector are improved by specific countermeasures.Finally,further research subjects are put forward. | He, Shien Suonan, Jiale Kang, Xiaoning Song, Guobing | 2012 | 电力系统自动化2012，36，8： | 6 |
| 2 | Fault component integrated impedance-based pilot protection scheme for EHV/UHV transmission line with thyristor controlled series capacitor(TCSC) and controllable shunt reactor(CSR)显示文摘This paper analyzes the fundamental frequency impedance characteristic of a thyristor controlled series capacitor(TCSC) and presents a novel transmission line pilot protection scheme based on fault component integrated impedance(FCII) calculated for a transmission line with TCSC and controllable shunt reactor(CSR).The FCII is defined as the ratio of the sum of the fault component voltage phasors of a transmission line with TCSC and CSR to the sum of the fault component current phasors where all the phasors are determined at both line's terminals.It can be used to distinguish internal faults occurring on the line from external ones.If the fault is an external one the FCII reflects the line's capacitive impedance and has large value.If the fault is an internal one on the line the FCII reflects the impedance of the equivalent system and the line and is relatively small.The new pilot protection scheme can be easily set and has the fault phase selection ability and also it is not affected by the capacitive current and the fault transition resistance.It is not sensitive to compensation level and dynamics of TCSC and CSR.The effectiveness of the new scheme is validated against data obtained in ATP simulations and Northwest China 750 kV Project. | HE ShiEn SUONAN JaLe KANG XiaoNing JIAO ZaiBin | 2013 | Science China(Technological Sciences)2013，56，2： | 1 |
| 3 | Operation and Development of Grid-Integrated Jiuquan Wind Power Base显示文摘In this paper the author describes the current development of the 10-GW wind power base in Jiuquan, Gansu Province. The future planning of the wind power base and the relevant power grid are also introduced based on the assessment on the wind resources and the wind power operation with the grid. | He Shien Wind Power Technical Center, Gansu Electric Power Corporation Zhu Li | 2011 | Electricity2011，22，1： | 0 |
| 4 | Oscillation Modes of Weld Pool in Stationary GTA Welding Using Structure Laser Method显示文摘Researchers have recently attempted to monitor pool oscillations using the three-dimensional laser vision method.However,the deficiency of simulation software will result in significant capital expenditure.Both simulations and experiments are performed in this study,and the Bessel equation is used to analyze the oscillation mode of a weld pool.The laser dot matrix images of(0,1),(1,1),(2,1),and(0,2)oscillation modes at different times are obtained via structured laser optical measurement simulation.The oscillation mode of a stationary gas tungsten arc weld pool is analyzed based on laser dot matrix images obtained from a structure laser experiment.Results show that the simulated laser dot matrix images are consistent with the experiment results.The oscillation mode of the weld pool can be recognized based on the laser dot matrix image.This study not only provides conditions for assessing the penetrating state of a weld pool,but also enable a further understanding of the oscillation mode of a weld pool and the development of more effective observation methods and measurement tools to effectively control and improve welding quality. | Xingpei Wu Jiankang Huang Jing He Shien Liu Guangyin Liu Ding Fan | 2021 | Chinese Journal of Mechanical Engineering2021，34，5： | 0 |
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