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142 results on '"Dou, Xiaobo"'

2. A Novel Synchronous Reference Frame Frequency-Locked Loop

Author

Quan, Xiangjun, Hu, Qinran, Huang, Alex Q., Dou, Xiaobo, and Wu, Zaijun

Subjects
Electrical Engineering and Systems Science - Systems and Control
Abstract

This letter proposes a new design of frequency-locked loop (FLL) which is based on synchronous (dq) reference frame instead of stationary ({\alpha}\b{eta}) reference frame. First, a synchronous reference frame FLL (briefly called SRF-FLL0) equivalent to the conventional FLL is proposed. Then the SRF-FLL0 is improved by utilizing the phase error to acquire a better performance. The small-signal modeling and parameter tuning of the improved synchronous reference frame FLL (SRF-FLL) are presented. Finally, the theoretical analysis and experiment results verify the superiority and effectiveness of proposed SRF-FLL., Comment: 4 pages, 6 figures

Published
2019

5. Campus microgrid protection: a unified approach against cyberattacks.

Author

Liu, Huanan, Huang, Long, Dou, Zhenlan, Wang, Songcen, Dou, Xiaobo, and Andrei, Horia

Subjects
DISTRIBUTED power generation, VOLTAGE control, TELECOMMUNICATION systems, MICROGRIDS, VOLTAGE
Abstract

When False Data Injection (FDI) attacks inject false data into the controllers of a microgrid, it can lead the controllers to make decisions based on inaccurate information, ultimately resulting in system collapse. This study presents a novel approach to dynamically adjust output voltage in Campus Microgrids (CMG). Initially, we use feedback linearization techniques to address the inherent nonlinear complexities in Distributed Generation (DG) dynamics. Moreover, during voltage regulation, controllers and sensors may be susceptible to FDI attacks. To address this, an elastic follower observer is introduced to mitigate the impact of false information injection attacks on voltage coordination, thus ensuring the robustness and stability of the system. Notably, our method reduces dependence on global information and fault boundaries within the communication network, thereby enhancing system elasticity and efficiency. In conclusion, through comprehensive simulation experiments, we evaluate the effectiveness and performance of our proposed strategy. The simulation results validate the success of our approach in voltage regulation and its efficiency in fault management. These findings bear significant implications for the advancement of voltage regulation strategies in distributed generation systems. [ABSTRACT FROM AUTHOR]

Published
2024
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7. Modular Operational Reliability Evaluation of Power Distribution Room Based on Data Learning

Author

Dou, Xiaobo, Zhang, Haoyi, Luo, Yuchao, Sun, Ruoxuan, Sun, Jianlong, Angrisani, Leopoldo, Series Editor, Arteaga, Marco, Series Editor, Panigrahi, Bijaya Ketan, 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, Hirche, Sandra, Series Editor, Jabbari, Faryar, Series Editor, Jia, Limin, Series Editor, Kacprzyk, Janusz, Series Editor, Khamis, Alaa, Series Editor, Kroeger, Torsten, Series Editor, Liang, Qilian, Series Editor, Martin, Ferran, Series Editor, Ming, Tan Cher, Series Editor, Minker, Wolfgang, Series Editor, Misra, Pradeep, Series Editor, Möller, Sebastian, Series Editor, Mukhopadhyay, Subhas, Series Editor, Ning, Cun-Zheng, Series Editor, Nishida, Toyoaki, 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, Zhang, Junjie James, Series Editor, Xue, Yusheng, editor, Zheng, Yuping, editor, and Rahman, Saifur, editor

Published
2020
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13. Containment-Based Distributed Cooperative Control of Microgrid Clusters: Accurately Constraining the Bus States of Loads and Microgrids

Author

Zhang, Congyue, Zhao, Jianfeng, Dou, Xiaobo, Hu, Qinran, Leng, Jingwen, and Liu, Kangli

Abstract

Collaborative control of microgrid clusters is challenging due to their nested control structures and the integration of heterogeneous microgrids. Besides, the wide coverage also causes some remote and sensitive industrial loads to face degraded voltage levels in the cluster system. To tackle these challenges, this work develops a novel distributed control strategy for islanded microgrid clusters. The strategy introduces tracking differentiator technology to unify different inner dynamics in heterogeneous microgrids, making them able to be coordinated in the same distributed network. Additionally, to accurately maintain the voltage level of sensitive and remote loads during distributed coordination, a containment control scheme that designs the leaders based on the running bus states of selected loads is developed. This scheme can flexibly and accurately converge the bus states of selected loads and controlled microgrids into a predefined containment range. Furthermore, to prevent instability caused by extended buffer time, a prediction-based mechanism is proposed to compensate for asynchronous delays. Finally, the effectiveness of our strategy is validated through several simulation cases and an RTLAB-based experiment.

Published
2024
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47. A Fault Locating Method Based on Travelling Wave for MMC Based DC Distribution Network

Author

Dou Xiaobo, Wu Zaijun, Jiale Lv, Wang Luyao, and Yang Jinggang

Subjects
Degree (graph theory), Computer science, Component (UML), Point (geometry), Converters, Fault (power engineering), Topology, Complex calculation, Signal, Hilbert–Huang transform
Abstract

Combined with Empirical Mode Decomposition method(EMD) and travelling-wave protection, a strategy is put forward to precisely locate the fault point by calculating the distance between converters and it. After the fault occurred, signals of line current were collected and separated into different functions each with single frequency component through EMD method. Then, functions were transformed into time spectrum which clearly exhibited the relationship among time, frequency and the signal. The time when travelling waves arrived the monitoring point was thus confirmed and the fault distance was obtained afterwards. Performances of the proposed criterion show a high degree of accuracy through numerical simulations. The strategy effectively realizes the full-length protection and the tolerance under different transition resistances in fault locating problem avoiding complex calculation or additional modules.

Published
2020

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