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Effects of Wind Generation Uncertainty and Volatility on Power System Small Signal Stability
Shi, Li-Bao,Kang, Li,Yao, Liang-Zhong,Qin, Shi-Yao,Wang, Rui-Ming,Zhang, Jin-Ping The Korean Institute of Electrical Engineers 2014 Journal of Electrical Engineering & Technology Vol.9 No.1
This paper discusses the impacts of large scale grid-connected wind farm equipped with permanent magnet synchronous generator (PMSG) on power system small signal stability (SSS) incorporating wind generation uncertainty and volatility. Firstly, a practical simplified PMSG model with rotor-flux-oriented control strategy applied is derived. In modeling PMSG generator side converter, the generator-voltage-oriented control strategy is utilized to implement the decoupled control of active and reactive power output. In modeling PMSG grid side converter, the grid-voltage-oriented control strategy is applied to realize the control of DC link voltage and the reactive power regulation. Based on the Weibull distribution of wind speed, the Monte Carlo simulation technique based is carried out on the IEEE 16-generator-68-bus test system as benchmark to study the impacts of wind generation uncertainty and volatility on small signal stability. Finally, some preliminary conclusions and comments are given.
Nonlocal Formulation for Numerical Analysis of Post-Blast Behavior of RC Columns
Zhong-Xian Li,Bo Zhong,Yanchao Shi,Jia-Bao Yan 한국콘크리트학회 2017 International Journal of Concrete Structures and M Vol.11 No.2
Residual axial capacity from numerical analysis was widely used as a critical indicator for damage assessment of reinforced concrete (RC) columns subjected to blast loads. However, the convergence of the numerical result was generally based on the displacement response, which might not necessarily generate the correct post-blast results in case that the strain softening behavior of concrete was considered. In this paper, two widely used concrete models are adopted for post-blast analysis of a RC column under blast loading, while the calculated results show a pathological mesh size dependence even though the displacement response is converged. As a consequence, a nonlocal integral formulation is implemented in a concrete damage model to ensure mesh size independent objectivity of the local and global responses. Two numerical examples, one to a RC column with strain softening response and the other one to a RC column with post-blast response, are conducted by the nonlocal damage model, and the results indicate that both the two cases obtain objective response in the post-peak stage.
PS-connectedness of $L$-subsets
Shi-Zhong Bai 대한수학회 2007 대한수학회지 Vol.44 No.1
It is known that conectednes is one of the important no-tions in topology. In this paper, a new notion of conectedne s is in-troduced in L-topological spaces, which is caled PS-conectednes. Itcontains ome nice properties. Especialy, the famous K. Fa n’s Theoremholds for PS-conectednes in L-topological spaces.
RESEARCH ON SENTIMENT ANALYSIS METHOD BASED ON WEIBO COMMENTS
Li, Zhong-Shi,He, Lin,Guo, Wei-Jie,Jin, Zhe-Zhi The Youngnam Mathematical Society 2021 East Asian mathematical journal Vol.37 No.5
In China, Weibo is one of the social platforms with more users. It has the characteristics of fast information transmission and wide coverage. People can comment on a certain event on Weibo to express their emotions and attitudes. Judging the emotional tendency of users' comments is not only beneficial to the monitoring of the management department, but also has very high application value for rumor suppression, public opinion guidance, and marketing. This paper proposes a two-input Adaboost model based on TextCNN and BiLSTM. Use the TextCNN model that can perform local feature extraction and the BiLSTM model that can perform global feature extraction to process comment data in parallel. Finally, the classification results of the two models are fused through the improved Adaboost algorithm to improve the accuracy of text classification.
Nonlocal Formulation for Numerical Analysis of Post-Blast Behavior of RC Columns
Li, Zhong-Xian,Zhong, Bo,Shi, Yanchao,Yan, Jia-Bao Korea Concrete Institute 2017 International Journal of Concrete Structures and M Vol.11 No.2
Residual axial capacity from numerical analysis was widely used as a critical indicator for damage assessment of reinforced concrete (RC) columns subjected to blast loads. However, the convergence of the numerical result was generally based on the displacement response, which might not necessarily generate the correct post-blast results in case that the strain softening behavior of concrete was considered. In this paper, two widely used concrete models are adopted for post-blast analysis of a RC column under blast loading, while the calculated results show a pathological mesh size dependence even though the displacement response is converged. As a consequence, a nonlocal integral formulation is implemented in a concrete damage model to ensure mesh size independent objectivity of the local and global responses. Two numerical examples, one to a RC column with strain softening response and the other one to a RC column with post-blast response, are conducted by the nonlocal damage model, and the results indicate that both the two cases obtain objective response in the post-peak stage.
Bai, Shi-Zhong Korean Mathematical Society 2007 대한수학회지 Vol.44 No.1
It is known that connectedness is one of the important notions in topology. In this paper, a new notion of connectedness is introduced in L-topological spaces, which is called PS-connectedness. It contains some nice properties. Especially, the famous K. Fan's Theorem holds for PS-connectedness in L-topological spaces.