Search

Your search keyword '"Zeng, Xiangjun"' showing total 795 results
Start Over Author "Zeng, Xiangjun" Publication Year Range Last 50 years

Refine your results

795 results on '"Zeng, Xiangjun"'

1. Analysis of Unrecoverable Breakdown Ground Fault Scenarios in the Internal Insulation of Large Generator Stators

Author

Li, Li, Yu, Kun, Zeng, Xiangjun, Chen, Lisi, Wu, Chenyu, Angrisani, Leopoldo, Series Editor, Arteaga, Marco, Series Editor, Chakraborty, Samarjit, Series Editor, Chen, Jiming, Series Editor, Chen, Shanben, Series Editor, Chen, Tan Kay, Series Editor, Dillmann, Rüdiger, Series Editor, Duan, Haibin, Series Editor, Ferrari, Gianluigi, Series Editor, Ferre, Manuel, Series Editor, Jabbari, Faryar, Series Editor, Jia, Limin, Series Editor, Kacprzyk, Janusz, Series Editor, Khamis, Alaa, Series Editor, Kroeger, Torsten, Series Editor, Li, Yong, Series Editor, Liang, Qilian, Series Editor, Martín, Ferran, Series Editor, Ming, Tan Cher, Series Editor, Minker, Wolfgang, Series Editor, Misra, Pradeep, Series Editor, Mukhopadhyay, Subhas, Series Editor, Ning, Cun-Zheng, Series Editor, Nishida, Toyoaki, Series Editor, Oneto, Luca, Series Editor, Panigrahi, Bijaya Ketan, Series Editor, Pascucci, Federica, Series Editor, Qin, Yong, Series Editor, Seng, Gan Woon, Series Editor, Speidel, Joachim, Series Editor, Veiga, Germano, Series Editor, Wu, Haitao, Series Editor, Zamboni, Walter, Series Editor, Tan, Kay Chen, Series Editor, Yang, Qingxin, editor, Li, Zewen, editor, and Luo, An, editor

Published
2024
Full Text
View/download PDF

30. Research on PI automatic tracking and arc elimination method based on phase deviation‐fault residual voltage control.

Author

Liu, Hongwen, Zeng, Xiangjun, Yang, Qing, and Chai, Chenchao

Subjects
*IDEAL sources (Electric circuits), *VOLTAGE control, *AUTOMATIC tracking, *POWER resources, *CURRENT distribution
Abstract

Aiming at the problem that the current arc suppression method of coil cannot achieve full compensation. First, the calculation model of the full compensation parameters of the controllable voltage source is established by analyzing the grounding fault arc suppression principle of the independent controllable voltage source and the parallel arc suppression coil. Second, by analyzing the arc suppression characteristics of controllable voltage source, a PI automatic regulation method based on phase deviation‐fault residual voltage control is proposed. The method uses fault residual voltage and the change of output voltage amplitude of controllable voltage source to control the adjustment direction and fault residual voltage to control the output voltage amplitude of controllable voltage source. The simulation results show that when the capacitive current of the distribution network is 24.47 A, the fault residual voltage is 2.5 V and the residual current is 446 mA after compensation by the independent controllable voltage source. When the capacitive current is 40.8 A and the deharmonic degree of arc suppression coil is −9%, the fault residual voltage and residual current are 2.2 V and 60 mA after compensated by the parallel arc suppression coil of the controlled voltage source. The proposed PI control method exhibits good stability, resulting in low fault residual voltage, and outperforms traditional control methods, enhancing the arc extinction effect of ground faults. [ABSTRACT FROM AUTHOR]

Published
2024
Full Text
View/download PDF

31. Double closed loop PI control with full compensation arc elimination based on zero sequence voltage of neutral point.

Author

Liu, Hongwen, Zeng, Xiangjun, yang, Qing, and Chai, Chenchao

Subjects
*VOLTAGE, *IDEAL sources (Electric circuits), *VOLTAGE control
Abstract

Aiming at the problem of zero sequence voltage generated by unbalance parameters of line to ground, which affects arc suppression effect of grounding fault of controllable voltage source. By analyzing the influence of ground unbalance parameters on the arc suppression effect of controllable voltage source under different grounding modes, the mechanism of full compensation arc suppression based on zero sequence voltage of neutral point is revealed, and on this basis, a fully compensated arc suppression model of controllable voltage source controlled by double closed loop PI is established, and the deviation control is carried out by using the neutral voltage of distribution network and the voltage of fault phase supply. The residual voltage ring adopts the ground fault phase residual voltage for closed loop control. The simulation results show that the dual-closed-loop PI control algorithm can continuously stabilize the output waveform of the controllable voltage source. When the transition resistance is 0.1 ~ 10 kΩ, the residual voltage stabilization time of the independent controllable voltage source grounding method is 43 ms ~ 2.4 s, and the parallel arc suppression coil grounding method is 43 ms ~ 4.7 s. The proposed dual closed-loop PI control method for neutral point voltage deviation and fault residual voltage can stabilize the residual voltage of the grounded fault phase to below 10 V, forcing reliable arc extinction at the grounded fault point, exhibiting good stability. Low-voltage simulation tests have also proved the feasibility of the algorithm. [ABSTRACT FROM AUTHOR]

Published
2024
Full Text
View/download PDF

43. Single Line-to-Ground Fault Protection Method Considering Three Phase-to-Ground Parameters Asymmetry in Active Flexible Grounding Systems

Author

Liu, Baowen, Wang, Chenyu, Zeng, Xiangjun, Cui, Luyao, and Wan, Zixiong

Abstract

The asymmetry of three phase-to-ground parameters is common in distribution networks, and the asymmetry of each feeder has the random difference. However, most of existing single line-to-ground (SLG) fault detection and arc suppression methods ignored the influence of asymmetry on fault protection reliability. In response to this problem, this paper firstly establishes a new zero-sequence equivalent model considering three phase-to-ground parameters asymmetry in an active flexible grounding system. Based on the zero-sequence voltage and current before and after the adjustment of the injected current in this model, the distribution characteristics of the injected current and the grounding parameters of each feeder are calculated, which can be used as the criteria for faulty feeder selection. Then, the unbalanced ground-fault current caused by the asymmetry is discovered, and the voltage-based arc suppression method is proposed to fully compensate these unbalanced components. Finally, considering the asymmetry of three phase-to-ground parameters, an SLG fault protection synchronous control strategy with a coordinated process of arc suppression and fault detection is proposed in active flexible grounding systems. The high reliability of the proposed method is confirmed by comparative experimental results with the theoretical analysis.

Published
2024
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results