Boyu Li

Beijing University of Technology

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Zhiguo Hao

Xi'an Jiaotong University

Zhongxin Xue

Xi'an Jiaotong University

Yucheng Zhang

Nanchang University

Fucheng Cheng

Peng Cheng Laboratory

Shaoyong Yao

Xi'an Jiaotong University

Jie Li

North China Electric Power University

Zhanshe Guo

Beihang University

Jianan Si

State Grid Corporation of China (China)

Guoliang Wang

Liaoning Shihua University

Qiang Zhang

Tsinghua University

Cooperative Institutions

Zhejiang University

242

Chinese Academy of Sciences

116

University of Chinese Academy of Sciences

Tsinghua University

Huazhong University of Science and Technology

Peking University

Sun Yat-sen University

Shanghai Jiao Tong University

Southeast University

Xi'an Jiaotong University

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A new thin beam element with cross-section distortion of the absolute nodal coordinate formulation

Proceedings of the Institution of Mechanical Engineers Part C Journal of Mechanical Engineering Science (2021)

Zhenxing Shen Xiaofeng Xing Boyu Li

A novel modelling approach to beams with thin cross-sections is proposed in the absolute nodal coordinate formulation (ANCF), where the Lagrange interpolating and curve fitting techniques of numerical analysis are utilized for construction of the thin beam cross-section contour. Although the slope vector with respect to the coordinate line on cross-section contour is not considered in nodal coordinates, the cross-section distortion could be adequately captured through selecting an appropriate degree of polynomial. The main advantages of the present ANCF thin beam element are that the computational costs are more inexpensive than the ANCF shell element due to less generalized coordinates, there is very small amount of input data because slope vectors of the cross-section are eliminated, and the cross-sectional stress distribution may always be continuous on account of the fact that the cross-section is not discretized into a set of finite elements. Moreover, the formulations of elastic forces and Jacobian of thin laminated composite beam are also derived based on the continuum mechanics. Finally, several examples including both static and dynamic problems are performed to verify the new element and meanwhile demonstrate its general characteristics.

Distortion (music)

10.1177/09544062211020046

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Citations (4)

Research on Pressure Characteristics of Tank Wall During Internal Flashover Discharge Under AC Voltage of Oil Tank

Jianan Si Zhiguo Hao Xingwang Wu Zhongxin Xue Boyu Li

Power transformers are important equipment for power system conversion and transmission of power system. In recent years, many transformer fires and explosions have occurred in the power system, and most of them are caused by the internal arc fault of the transformer, and the internal arc has gradually developed from partial discharge. In order to have a more comprehensive understanding of the changes in the tank wall pressure during the development of the internal discharge of the transformer, and to monitor the development of the internal discharge of the transformer, this paper studies the characteristics of the tank wall pressure during flashover discharge inside the tank.

Electric arc

Arc flash

Power transmission

Internal pressure

10.1109/icempe51623.2021.9509227

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Research development of silicon MEMS gyroscopes: a review

Microsystem Technologies (2015)

Zhanshe Guo Fucheng Cheng Boyu Li Cao Le Chao Lu

Rate integrating gyroscope

10.1007/s00542-015-2645-x

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Citations (113)

Developing Characteristics of Oil-immersed Transformer Internal Fault with Dignostic Method Using Convergence Patterns of Free Gas

2021 IEEE 2nd China International Youth Conference on Electrical Engineering (CIYCEE) (2021)

Yucheng Zhang Zhiguo Hao Yuping Zheng Shuyan Pan Boyu Li

Light gas protection only operates when gas within the transformer collection chamber reaches threshold volume. Such criterion failed to reflect transformer conditions accurately due to the lack of understanding for defect developing process and corresponding gas generation- convergence pattern, which has led to lower protection reliability and has caused several transformer explosions. To address current problem, an experimental tank with structure resembling that of a power transformer is set up, inside which the needle-plate oil-pressboard breakdown model is planted. Experimental results indicate that throughout fault development, voltage drops became more frequent until arcing occurs, so is HFCT signal; meanwhile gas generation rate increases through slight partial discharge, spark discharge and arcing stage, the collected gas volume corresponds with patterns above. The purpose of this study is to clarify the defect developing process and the gas generation-convergence pattern for oil-immersed transformer internal fault in guidance for a more reliable protection method.

Pressboard

Electric arc

Dissolved Gas Analysis

10.1109/ciycee53554.2021.9676952

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Citations (1)

Table of Contents

Tianting Zhao Zhuo Yue Yang Xin Yuchen Wang Qing Miao

Table (database)

10.1109/eei59236.2023.10212639

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The principle and influence analysis of suppressing ultra-low frequency oscillation by using additional GPSS control

Tao Xu Sun Shiyun Zichao Zhou Haiyang Feng Han Deng

The distribution of power energy in China has promoted the development of long-distance and large-capacity ultra-high voltage direct current transmission projects. The asynchronous interconnection of power grids has become the mainstream trend, which makes the sending-end system dominated by hydropower have serious frequency stability problems. Therefore, this paper first analyzes the damping properties of the speed control system of hydropower units, and reveals that the negative damping caused by the phase lag of the speed control system is the root cause of the ultra-low frequency oscillation. Secondly, a method of using the lead-lag link of GPSS to compensate the phase lag of the speed control system to improve the damping is proposed, which can effectively suppress the ultra-low frequency oscillation under the requirement of frequency modulation performance. Then the root locus method is used to analyze the control parameters, and it is concluded that the appropriate GPSS control parameters can effectively improve the stability of the system. Finally, a single-machine single-load model is built by PSCAD/EMTDC electromagnetic simulation platform to verify the effectiveness of the GPSS to suppress ultra-low frequency oscillation.

Oscillation (cell signaling)

Low-frequency oscillation

Root locus

GPSS

Master/slave

10.1109/icips59254.2023.10404304

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A numerical study on smoke propagation in metro tunnel fires with different door opening scenarios

Journal of Physics Conference Series (2024)

Boyu Li Yanfeng Li Zhihe Su Shan Feng

Abstract Numerical study was carried out to analyze the effect of door opening scenario on the smoke propagation in metro tunnel fires. The smoke back-layering length, critical velocity, and temperature distribution were studied under a total of 8 working conditions. Results show that the opening of emergency exit doors could result in a shorter smoke back-layering length in the train compartment. In such conditions, a smaller driving force was needed to approach the critical velocity. On the other hand, the high temperature area of the tunnel evacuation platform would change under different opening scenarios. The research result could be used as a deeper understanding of the smoke propagation of metro fire and a reference for the formulation of smoke control.

Railway tunnel

10.1088/1742-6596/2732/1/012006

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Internal Pressure Characteristics of Oil-immersed Power Transformer Under Internal Arc Fault

Jianliang Shen Fan Li Xianjun Shao Xinwei Wang Boyu Li

In recent years, there have been many accidents of oil-immersed power transformer explosion caused by internal arc fault worldwide, which seriously endanger the security of power system. As the most direct cause of deformation and rupture of transformer oil tanks, the pressure distribution changes caused by the internal arc fault in oil-immersed power transformers is worth to be studied, but the current research is not yet complete. And protection schemes based on pressure characteristics also mostly remain in the stage of pressure relief devices that act on pressure amplitude reaching threshold. In this paper, a real scale 25MVA/110kV oil-immersed power transformer is reformed, several groups of arc breakdown experiments in transformer oil are carried out. And multipoint pressure signals on the oil tank wall under the internal arc fault are simultaneously recorded and analyzed. The experiment results and analysis show that the amplitude of pressure signal is negatively correlated with the distance between the fault point and the pressure measurement point, and the time delay of pressure signal is positively correlated with the distance between the fault point and the pressure measurement point. The pressure signal measured at the pressure measurement points that are relatively close to the fault point have an obvious dominant frequency. The research results lay a foundation for the further development of new non-electric protection based on the pressure characteristics.

Electric arc

10.1109/icpst56889.2023.10165571

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Modeling and Analysis of Tank Rupture Due to Internal Electrical Fault in Oil-filled Power Transformer

2021 International Conference on Advanced Electrical Equipment and Reliable Operation (AEERO) (2021)

Boyu Li Zhiguo Hao Guocheng Ding Yucheng Zhang Zhongxin Xue

In recent years, oil-filled power transformer explosion accidents occur from time to time, and have caused serious effect to the power system. To analyze the cause of oil tank rupture, a new numerical simulation model is established to calculate internal pressure rise caused by arc fault, and stress field of the tank body. Based on theories of wave acoustics, thermodynamics and solid mechanics, the model describes bubble's generation, propagation of pressure wave, and deformation of the transformer tank. The simulation results are in good agreement with accident phenomena, which can provide reference for the future accident prevention.

Oil tank

Pressure wave

Internal pressure

Electric arc

10.1109/aeero52475.2021.9708106

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Citations (7)

Mechanism of Gas Movement and Convergence in Oil-immersed Transformer

Yucheng Zhang Zhiguo Hao Hai-Tao Yang Boyu Li Shaoyong Yao

As a transformer main protection, light gas protection responds to transformer failure solely based on the gas volume within its collection chamber. Such single protection criterion failed to reflect the actual transformer working condition accurately, which have led to protection malfunction or refusal-operation and caused several transformer explosions so far. In order to analyze the mechanism of gas movement and convergence within oil-immersed transformer, an experimental tank with physical structure resembling that of a power transformer is set up, corresponding two-phase flow model is established in ANSYS, simulations of different developing stages throughout the oil-paper insulation breakdown process is conducted. Experiments confirm with simulation results, which state that as fault develops, gas transferred from where the fault occurs, to the upper surface of different structures within the tank; gas generation rate increases throughout time, during which gas exhibits different moving patterns and undergo morphological changes. The purpose of this study is to clarify the gas behavior within oil-immersed transformer based on the moving and converging pattern of gas generated by transformer internal fault.

Energy efficient transformer

Delta-wye transformer

10.1109/icempe51623.2021.9509192

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Citations (3)