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Research on Virtual DC Generator-Based Control Strategy of DCMicrogrid with Photovoltaic and Energy Storage

Energy engineering 2023年第6期120卷 1353-1370页

作者： Feng Zhao Chengrui Xiao Xiaoqiang Chen Ying Wang School of Automation and Electrical Engineering Lanzhou Jiaotong UniversityLanzhou730070China

With the penetration of a large number of photovoltaic power generation units and power electronic converters,the DC microgrid shows low inertia characteristics,which might affect the stable operation of the microgrid in extreme *** order to enhance the“flexible features”of the interface converter connected to the DC bus,a control strategy of DCmicrogrid with photovoltaic and energy storage based on the virtual DC generator(VDCG)is proposed in this *** interface converters of the photovoltaic power generation system and the energy storage system simulates the inertia and damping characteristics of the DC generator to improve the stability of the DC bus *** impedance ratio of DC microgrid was obtained by establishing the small-signal model of photovoltaic power generation system and energy storage system,and the Nyquist curves was applied to analyze the small-signal stability of the ***,the simulation results were verified with MATLAB/*** results show that the proposed control strategy can slow down the fluctuation of bus voltage under the conditions of photovoltaic power fluctuation and load mutation,thus enhancing the system stability.

关键词： DC microgrid with photovoltaic and energy storage virtual DC generator the low inertia characteristics smallsignal model impedance ratio

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Fault-Tolerant Formation Control for Leader-Follower Flight Vehicles Under Malicious Attacks

IEEE Transactions on Intelligent Vehicles

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IEEE Transactions on Intelligent Vehicles 2024年 1-15页

作者： Li, Guofei Wang, Xianzhi Zuo, Zongyu Wu, Yunjie Lu, Jinhu School of Astronautics Northwestern Polytechnical University Xi'an China School of Automation Science and Electrical Engineering Beihang University Beijing China

This paper investigates the problem of leader-follower formation control under malicious communication attacks. A flight vehicle group consisting of one leader and several followers is considered to achieve a desired formation and maintain it when encountering the false data injection attacks (FDIAs). Two kinds of fault-tolerant formation control methods are presented with practical finite-time convergence. The former is based on a distributed position observer which estimates the information of the leader, and the formation is established by enforcing the followers to track their expected positions related to the estimated leader's information. While the latter is an observer-free adaptive formation control strategy. For the communication attack resistance, the confidence factors and trust factors are constructed and equipped in both methods. The simulations are conducted to validate the effectiveness of the proposed fault-tolerant formation control strategies. IEEE

关键词： Fault tolerance

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Coalition formation problem: a capability-centric analysis and general model

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Science China(Information Sciences) 2024年第11期67卷 180-193页

作者： Jie CHEN Miao GUO Bin XIN Qing WANG Shengyu LU Yipeng WANG Yulong DING School of Automation Beijing Institute of Technology National Key Lab of Autonomous Intelligent Unmanned Systems Department of Control Science and Engineering Tongji University

Coalition formation(CF) refers to reasonably organizing robots and/or humans to form coalitions that can satisfy mission requirements, attracting more and more attention in many fields such as multirobot collaboration and human-robot collaboration. However, the analysis on CF problems remains *** provide a valuable study reference for researchers interested in CF, this paper proposed a capabilitycentric analysis of the CF problem. The key problem elements of CF are firstly extracted by referencing the concepts of the 5W1H method. That is, objects(who) form coalitions(what) to accomplish missions(why) by aggregating capabilities(how) in a specific environment(where-when). Then, a multi-view analysis of these elements and their correlation in terms of capabilities is proposed through various logic diagrams, structure charts, etc. Finally, to facilitate a deeper understanding of capability-centric CF, a general mathematical model is constructed, demonstrating how the different concepts discussed in this analysis contribute to the overall model.

关键词： coalition formation capability aggregation capability metric mission requirement environmental effect

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Controllability of discrete-time inhomogeneous bilinear systems with real spectrum: Algebraically verifiable criteria

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Journal of the Franklin Institute 2023年第3期360卷 1706-1732页

作者： Tie, Lin School of Automation Science and Electrical Engineering Beihang University Beijing100083 China

One of the drawbacks of the controllability theory for nonlinear systems is that most existing controllability criteria are not algebraically verifiable, which makes them difficult to apply especially if the system dimension is high. Thus, it is a significant task to seek algebraically verifiable controllability criteria for nonlinear systems. In this paper, we study controllability of discrete-time inhomogeneous bilinear systems. In the classical results on controllability of such systems, a necessary condition is that the linear part has to be controllable. However, we will show that this condition is in fact not necessary for controllability. Specifically, we first define the spectrum for discrete-time inhomogeneous bilinear systems and reveal that the spectrum is a fundamental property which is very useful in investigating the controllability problems. We then present controllability criteria for the systems with real spectrum, which are algebraically verifiable. Furthermore, we also provide algorithms for the controllable systems to compute the exact or approximated control inputs to achieve the transition between any given pair of states. The presented controllability criteria and algorithms work for the systems in any finite dimension and are easy to implement. More importantly, through our controllability criteria, we reveal that controllability of the linear part is not necessary for discrete-time inhomogeneous bilinear systems to be controllable. Examples are given to illustrate the presented algebraic controllability criteria. © 2022 The Franklin Institute

关键词： Controllability

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Flexible prescribed performance-based approaching control for UAV aerial recovery under multiwind disturbances

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Chinese Journal of Aeronautics 2025年第4期38卷 420-436页

作者： Yanxiang WANG Honglun WANG Junfan ZHU Yiheng LIU Menghua ZHANG Zikang SU School of Automation Science and Electrical Engineering Beihang UniversityBeijing 100191China The Science and Technology on Aircraft Control Laboratory Beihang UniversityBeijing 100191China Shenyuan Honors College Beihang UniversityBeijing 100191China Beijing Institute of Astronautical Systems Engineering Beijing 100076China College of Automation Engineering Nanjing University of Aeronautics and AstronauticsNanjing 211106China

This article investigates the approaching control for fixed-wing Unmanned Aerial Vehi-cle(UAV)aerial recovery in the presence of pre-specified performance requirements,complex air-flows,maneuvering flight of transport aircraft,and different initial ***,a novelcontrol-oriented Six-Degree-Of-Freedom(6-DOF)UAV model considering airflow disturbancesis established for better consistency with the actual UAV ***,to achieve satisfactory per-formance in the approaching process,a Flexible Appointed-time Prescribed Performance Control(FAPPC)algorithm,with the features of user-specified time convergence,no overshoot,indepen-dence from the initial value,and singularity-free,is ***,to solve the singularityissue encountered by the existing PPC methods in dealing with sudden disturbances,an adaptiveadjustment signal is introduced in FAPPC to perceive the threat of increasing error and relax thepreset boundaries ***,minimum learning parameter-based neural networkestimators are developed to approximate unknown lumped disturbances at a low ***,the stability of the closed system is analyzed via Lyapunov synthesis,and the effective-ness and advantages of the proposed control scheme are demonstrated via simulation andHardware-In-the-Loop(HIL)experimental validation.

关键词： Approaching control UAV aerial recovery Flexible prescribed performance control Sudden disturbances Neural network estimator

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Two-stage Robust Optimization for Assessment of PV Hosting Capacity Based on Decision-dependent Uncertainty

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Journal of Modern Power Systems and Clean Energy 2024年第6期12卷 2091-2096页

作者： Haifeng Qiu Veerapandiyan Veerasamy Chao Ning Qirun Sun Hoay Beng Gooi School of Electrical and Electronic Engineering Nanyang Technological UniversitySingapore 639798 Department of Automation Shanghai Jiao Tong UniversityShanghai 200240China Chool of Electrical Engineering Southeast UniversityNanjing 210096China

Photovoltaic(PV)generation always exhibits strong uncertainty and variability;therefore,its excessive integration brings huge risks to the safe operation of power *** this letter,a two-stage robust optimization approach based on decision-dependent uncertainty is devised to identify the Pv hosting capacity that can be accepted to ensure the effective consumption of PV generation under *** proposed approach is validated by numerical experiments for a microgrid and a distribution network.

关键词： Uncertainty normalization photovoltaic(PV)hosting capacity robust optimization

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An Untethered Miniature Soft Jumping Robot Inspired by Quadrupeds

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Journal of Bionic engineering 2023年第4期20卷 1467-1480页

作者： Tianliang Zhong Fanan Wei Zhushan Zhai Wenguang Yang School of Mechanical Engineering and Automation Fuzhou UniversityFuzhou350108China School of Electromechanical and Automotive Engineering Yantai UniversityYantai264005ShandongChina State Key Laboratory of Robotics Shenyang Institute of AutomationChinese Academy of SciencesShenyang110016LiaoningChina

In recent years,designing a soft robot that can jump continuously and quickly explore in a narrow space has been a hot research *** the continuous efforts of researchers,many types of actuators have been developed and successfully employed to actuate the rapid locomotion of soft *** these mechanisms have enabled soft robots with excellent movement capabilities,they largely rely on external energy supply cables,which greatly limits their ***,it is still a big challenge to realize the unconstrained movement of the soft robot and the flexible adjustment of the movement direction in a narrow ***,a wireless magnetically controlled soft jumping robot with single-leg is proposed,which can achieve continuous and rapid jumping ***'s more interesting is that by changing the frequency and waveform of the control signal,this soft robot can easily switch between forward and backward *** motion direction switching function enables the magnetically controlled soft robot to return to the initial position without adjusting the direction when it completes the operation in a narrow pipe or takes the wrong path,which greatly improves the motion efficiency of the soft jumping robot and broadens its application field.

关键词： Wireless Magnetically controlled Soft robot Jumping Bidirectional motion

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Position information encoding FPN for small object detection in aerial images

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Neural Computing and Applications 2024年第26期36卷 16023-16035页

作者： Feng, Dapeng Zhuang, Xuebin Chen, Zhiqiang Zhong, Shipeng Qi, Yuhua Chen, Hongbo Ma, Hongjun School of System Science and Engineering Sun Yat-sen University Guangzhou510275 China School of Automation Science and Engineering South China University of Technology Guangzhou Guangzhou510641 China

Small object detection in aerial images is a challenge in remote sensing. Recently, convolutional neural networks (CNNs) have succeeded by learning localized filters that embed relative spatial information but fail to detect the small objects in the aerial images for the uneven padding. Even though the padding mechanism in CNNs allows for the capture of absolute position information and ensures consistent input–output resolution, it leads to a diminishing extraction of absolute position context from the edges to the center. This results in asymmetry bias, which negatively impacts position-dependent visual tasks like small object detection, causing blind spots and misdetection. In this study, we uncover that complex-valued CNNs, capable of explicitly encoding absolute position information, can significantly enhance conventional object detection techniques. To accomplish this, we introduce the position information encoding feature pyramid network (PieFPN), which consists of a complex-valued encoder and a real-valued decoder for explicit position information encoding. Additionally, we present the general Gaussian normalization and Gaussian error linear unit for multi-variables, incorporating them into end-to-end training schemes. To utilize the ImageNet pre-trained weights, we merge PieF with traditional feature pyramid networks, allowing for seamless integration into existing object detection pipelines. Our complex-valued designs outperform their real-valued counterparts, achieving state-of-the-art results on the DOTA-v2.0 oriented object detection in aerial images dataset. © The Author(s), under exclusive licence to Springer-Verlag London Ltd., part of Springer Nature 2024.

关键词： Object detection

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Interaction is Worth More Explanations: Improving Human-Object Interaction Representation with Propositional Knowledge

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IEEE Transactions on Cognitive and Developmental Systems 2024年第3期17卷 631-643页

作者： Yang, Feng Cao, Yichao Li, Xuanpeng Zhang, Weigong Southeast University School of Instrument Science and Engineering Nanjing210096 China Southeast University School of Automation Nanjing210096 China

Detecting Human-Object Interactions (HOI) presents a formidable challenge, necessitating the discernment of intricate, high-level relationships between humans and objects. Recent studies have explored HOI Vision-and-Language Modeling (HOIVLM), which leverages linguistic information inspired by cross-modal technology. Despite its promise, current methodologies face challenges due to the constraints of limited annotation vocabularies and suboptimal word embeddings, which hinder effective alignment with visual features and consequently, the efficient transfer of linguistic knowledge. In this work, we propose a novel cross-modal framework that leverages external propositional knowledge which harmonize annotation text with a broader spectrum of world knowledge, enabling a more explicit and unambiguous representation of complex semantic relationships. Additionally, considering the prevalence of multiple complexities due to the symbiotic or distinctive relationships inherent in one HO pair, along with the identical interactions occurring with diverse HO pairs (e.g., 'human ride bicycle' vs. 'human ride horse'). The challenge lies in understanding the subtle differences and similarities between interactions involving different objects or occurring in varied contexts. To this end, we propose the Jaccard contrast strategy to simultaneously optimize cross-modal representation consistency across HO pairs (especially for cases where multiple interactions occur), which encompasses both vision-to-vision and vision-to-knowledge alignment objectives. The effectiveness of our proposed method is comprehensively validated through extensive experiments, showcasing its superiority in the field of HOI analysis. © 2024 IEEE.

关键词： Semantics

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Research on the Voltage Supporting Capability of Multi-VSC-HVDC Subsystems Operation Strategy to Receiving-end LCC-HVDC Network in Weak AC Grid

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CES Transactions on Electrical Machines and Systems 2023年第1期7卷 11-20页

作者： Tao Li Yongli Li Yuchen Zhu IEEE the School of Electrical Automation and Information Engineering Tianjin UniversityTianjin300072China CES

For the hybrid multi-infeed HVDC system in which the receiving-end grid is a strong AC grid including LCC-HVDC subsystems and multiple VSC-HVDC subsystems,it has higher voltage support ***,for weak AC grid,the voltage support capability of the multi-VSC-HVDC subsystems to the LCC-HVDC subsystem(voltage support capability-mVSCs-LCC)can resist the risk of commutation *** on this consideration,this paper proposes an evaluation index called Dynamic Voltage Support Strength Factor(DVSF)for the hybrid multi-infeed system,and uses this index to qualitatively judge the voltage support capability-mVSCs-LCC in weak AC *** addition,the proposed evaluation index can also indirectly judge the ability of the LCC-HVDC subsystem to suppress commutation ***,the mathematical model of the power flow of the LCC and VSC networks in the steady-state is analyzed,and the concept of DVSF applied to hybrid multi-infeed system is ***,the DVSF index is also used to qualitatively judge the voltage support ***,the influence of multiple VSC-HVDC subsystems with different operation strategies on the DVSF is analyzed with reference to the concept of ***,the indicators proposed in this paper are compared with other evaluation indicators through MATLAB simulation software to verify its *** importantly,the effects of multi-VSC-HVDC subsystems using different coordinated control strategies on the voltage support capability of the receiving-end LCC-HVDC subsystem are also verified.

关键词： Hybrid multi-infeed HVDC system Voltage support Multi-VSC-HVDC LCC-HVDC Commutation failure DVSF Control strategy

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