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RISS 인기검색어
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- 저자 : Fangcheng Liu (검색결과 5 건)
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Generalized Stability Criterion for Multi-module Distributed DC System
Liu, Fangcheng,Liu, Jinjun,Zhang, Haodong,Xue, Danhong The Korean Institute of Power Electronics 2014 JOURNAL OF POWER ELECTRONICS Vol.14 No.1
The stability issues of a multi-module distributed DC power system without current-sharing loop are analyzed in this study. The physical understanding of the terminal characteristics of each sub-module is focused on. All the modules are divided into two groups based on the different terminal property types, namely, impedance (Z) and admittance (Y) types. The equivalent circuits of each group are established to analyze the stability issues, and the mathematical equations of the equivalent circuits are derived. A generalized criterion for multi-module distributed systems is proposed based on the stability criterion in a cascade system. The proposed criterion is independent of the power flow direction.
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Generalized Stability Criterion for Multi-module Distributed DC System
Fangcheng Liu,Jinjun Liu,Haodong Zhang,Danhong Xue 전력전자학회 2014 JOURNAL OF POWER ELECTRONICS Vol.14 No.1
The stability issues of a multi-module distributed DC power system without current-sharing loop are analyzed in this study. The physical understanding of the terminal characteristics of each sub-module is focused on. All the modules are divided into two groups based on the different terminal property types, namely, impedance (Z) and admittance (Y) types. The equivalent circuits of each group are established to analyze the stability issues, and the mathematical equations of the equivalent circuits are derived. A generalized criterion for multi-module distributed systems is proposed based on the stability criterion in a cascade system. The proposed criterion is independent of the power flow direction.
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Pattern Recognition of Partial Discharge in Power Transformer Based on InfoGAN and CNN
Lv Fangcheng,Liu Guilin,Wang Qiang,Lu Xiuquan,Lei Shengfeng,Wang Shenghui,Ma Kang 대한전기학회 2023 Journal of Electrical Engineering & Technology Vol.18 No.2
As an important equipment in the power system, it has a significant meaning in scientifically diagnosing the insulation state of oil-immersed power transformers. At present, the pattern recognition of partial discharge (PD) in a transformer has the problem of the insufficient generalization ability of the classifier due to scarcity and imbalance of samples, resulting in low recognition accuracy. To solve this problem, this paper proposes a pattern recognition of the PD method based on information maximizing generative adversarial nets (InfoGAN) and convolutional neural networks. In this method, phase-resolved partial discharge (PRPD) maps, constructed from pulse current waveforms, are chosen as the training samples. First, the InfoGAN is trained to generate new samples which expanded the original sample database, then various classifiers are trained by using the expanded sample database to realize the pattern recognition. Results of the test show that the proposed method can generate new highly similar samples more stable than other data enhancement methods, and effectively enrich the data diversity. In addition, the classifier trained by the expanded sample database has better generalization ability and is applicable to different classifiers, while residual network 18 has the highest recognition rate of 99.0%. This method can effectively balance and expand PRPD samples, and improve the recognition accuracy of the classifier to a certain extent. It has a good application prospect in PD diagnosis engineering.
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Experimental study on unconfined compressive strength of rubberized cemented soil
Jie He,Duanwei Guo,Dexin Song,Fangcheng Liu,Lei Zhang,Qifeng Wen 대한토목학회 2023 KSCE Journal of Civil Engineering Vol.27 No.10
As an economical and environmentally friendly lightweight filler material, rubberized cemented soil has a broad application prospect in engineering. In order to analyze its engineering characteristics, the stress-strain curves were obtained by the unconfined compressive strength test under different compounding conditions, focusing on the changes in rubber particle size, rubber content, cement content, and curing age on the strength of rubberized cemented soil. Results indicate that: we can divide the stress-strain curve of rubberized cemented soil into four stages: compression dense stage, elastic deformation stage, yielding stage, and post-damage stage; the ductility and plasticity change regularly with cement content, rubber content, and rubber particle size; the strength of rubberized cemented soil increases with the increase of cement content and decreases with the increase of rubber content; In the content range of this test, the strength growth rate is the largest at the level of 5% − 10%, and the strength reduction rate is the smallest at 0% − 5% of rubber powder content; the unconfined compressive strength decreases and then increases as particle size grows, reaching its lowest value at 1 − 3 mm, which is considered to be the inferior particle size and the verification of the existence of the optimum particle size; the unconfined compressive strength of rubberized cemented soil has an excellent linear relation with the natural logarithm of the curing age, and its strength increases with the increase of lnT; a new comprehensive characterization parameter PCRT is proposed, which can effectively characterize the effects of rubber content, cement content and curing age on the compressive strength of rubberized cemented soil, and has a good power function relation.
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Jie He,Duanwei Guo,Dexin Song,Fangcheng Liu,Lei Zhang,Qifeng Wen 대한토목학회 2024 KSCE Journal of Civil Engineering Vol.28 No.5
The authors appreciated the discussants for their suggestions on their recent paper regarding four key topics: the evaluation of the ductility index of rubberized cemented soil, comparative analysis between predicted models and actual results, providing guidance and suggestions for the application of rubberized cemented soil in engineering practice, and evaluating the environmental impact of rubberized cemented soil. These discussions have practical significance and are worth further research in order to contribute to the research and application of rubberized cemented soil.
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