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Three-stage Defensive Framework for distributed Microgrid control Against Cyberattacks

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Journal of Modern Power Systems and Clean Energy 2022年第6期10卷 1669-1678页

作者： Xuanyi Xiao Quan Zhou Feng Wang Wen Huang College of Electrical and Information Engineering Hunan UniversityChangsha 410082China IEEE

With the wide integration of various distributed communication and control techniques,the cyber-physical microgrids face critical challenges raised by the emerging cyberattacks.This paper proposes a three-stage defensive framework for distributed microgrids against denial of service(DoS)and false data injection(FDI)attacks,including resilient control,communication network reconfiguration,and switching of local control.The resilient control in the first stage is capable of tackling simultaneous DoS and FDI attacks when the connectivity of communication network could be maintained under cyberattacks.The communication network reconfiguration method in the second stage and the subsequent switching of local control in the third stage based on the software-defined network(SDN)layer aim to cope with the network partitions caused by cyberattacks.The proposed defensive framework could effectively mitigate the impacts of a wide range of simultaneous DoS and FDI attacks in microgrids without requiring the specific assumptions of attacks and prompt detections,which would not incorporate additional cyberattack risks.Extensive case studies using a 13-bus microgrid system are conducted to validate the effectiveness of the proposed three-stage defensive framework against the simultaneous DoS and FDI attacks.

关键词： Microgrid cyber-physical systems cyberattack distributed control defensive framework

distributed coordinated control scheme of UAV swarm based on heterogeneous roles

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Chinese Journal of Aeronautics 2022年第1期35卷 81-97页

作者： Jiang ZHAO Jiaming SUN Zhihao CAI Yingxun WANG Kun WU School of Automation Science and Electrical Engineering Beihang UniversityBeijing 100083China Flying College Beihang UniversityBeijing 100083China

This paper proposes a new distributed coordinated control scheme based on heterogeneous roles for Unmanned Aerial Vehicle(UAV)swarm to achieve formation control.First,the framework of the distributed coordinated control scheme is designed on the basis of distributed Model Predictive control(DMPC).Then,the effect of heterogeneous roles including leader,coordinator and follower is discussed,and the role-based cost functions are developed to improve the performance of coordinated control for UAV swarm.Furthermore,a group of coordination strategies are proposed for UAVs with different roles to achieve swarm conflict resolution.Numerical simulations demonstrate that the presented distributed coordinated control scheme is effective to formulate and maintain the desired formation for the UAV swarm.

关键词： Coordination strategy distributed control Heterogeneous roles Swarm intelligence Unmanned Aerial Vehicles(UAV)

Differential flatness-based distributed control of underactuated robot swarms

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Applied Mathematics and Mechanics(English Edition) 2023年第10期44卷 1777-1790页

作者： Ningbo AN Qishao WANG Xiaochuan ZHAO Qingyun WANG Department of Dynamics and control Beihang UniversityBeijing 100191China Institute of Computer Application Technology China North Industries Group Corporation LimitedBeijing 100095China

This paper proposes a distributed control method based on the differential flatness(DF) property of robot swarms. The swarm DF mapping is established for underactuated differentially flat dynamics, according to the control objective. The DF mapping refers to the fact that the system state and input of each robot can be derived algebraically from the flat outputs of the leaders and the cooperative errors and their finite order derivatives. Based on the proposed swarm DF mapping, a distributed controller is designed. The distributed implementation of swarm DF mapping is achieved through observer design. The effectiveness of the proposed method is validated through a numerical simulation of quadrotor swarm synchronization.

关键词： differential flatness(DF) underactuated robot distributed control synchronization

distributed control Framework and Scalable Small-signal Stability Analysis for Dynamic Microgrids

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Chinese Journal of Electrical Engineering 2021年第4期7卷 49-59页

作者： Yuxi Men Yuhua Du Xiaonan Lu College of Engineering Temple UniversityPhiladelphia 19122USA

As a growing number of microgrids(MGs)has been integrated into the modern power grids,the interconnection and applicable cooperation among multiple MGs motivate the development of networked MGs.Dynamic MGs,as an advanced networked MGs structure,can not only integrate multiple MGs into the distribution system but also fulfill the requested system network reconfiguration with improved flexibility.A general distributed control approach for networked MGs is reviewed.A distributed control framework for dynamic MGs operation is developed,along with an extensible architecture with considerations of large-scale distributed energy resources(DERs)integration.A scalable small-signal stability analysis is conducted per the proposed distributed control strategies and the conditions under which the system is exponentially stable are derived.At last,the effectiveness of the proposed control framework and stability analysis are verified using a 6-bus test feeder.

关键词： Dynamic microgrids distributed control networked microgrids small-signal stability analysis

distributed Event-Triggered Tracking control of Heterogeneous Discrete-Time Multi-Agent Systems with Unknown Parameters

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Journal of Systems Science & Complexity 2022年第4期35卷 1330-1347页

作者： YANG Ruohan ZHOU Deyun School of Electronics and Information Northwestern Polytechnical UniversityXi’an710072China

In this paper,a novel design framework is developed to solve the cooperative tracking problem of heterogeneous discrete-time multi-agent systems with unknown agent parameters and directed communication topologies.First,a distributed event-triggered observer is developed to handle the heterogeneity of the multi-agent systems.An event-triggering mechanism is proposed to reduce the amount of data transmission between neighboring agents.Then,based on the proposed observer,a discrete-time distributed model reference adaptive controller is presented to deal with the unknown parameters of the multi-agent systems.It is shown that by using the proposed observer and the model reference adaptive controller,the proposed design framework could achieve output tracking of the unknown multi-agent systems for any communication graph containing a directed spanning tree.Finally,an example is presented to illustrate the effectiveness of the proposed controller.

关键词： Adaptive control cooperative control distributed control event-triggered control heterogeneous multi-agent systems

Data-driven consensus control of fully distributed event-triggered multi-agent systems

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Science China(Information Sciences) 2023年第5期66卷 147-161页

作者： Yifei LI Xin WANG Jian SUN Gang WANG Jie CHEN School of Automation Beijing Institute of Technology The State Key Lab of Autonomous Intelligent Unmanned Systems Beijing Institute of Technology Beijing Institute of Technology Chongqing Innovation Center Department of control Science and Engineering Tongji University

This study investigates the consensus control issue in discrete-time linear multi-agent systems(MASs) using data-driven control under undirected communication networks. To alleviate the communication burden, an adaptive event-triggered control strategy involving only local information is proposed and a model-based stability condition is derived that guarantees the asymptotic consensus of MASs. Furthermore,a data-based consensus condition for unknown MASs is established by combining a data-based system representation with the model-based stability condition, using only pre-collected noisy input-state data instead of the accurate system information a priori. Specifically, both model-based and data-driven event-triggered controllers can be utilized without requiring any global information. The validity and correctness of the controllers and associated theoretical results are demonstrated via numerical simulations.

关键词： distributed control event-triggered control data-driven control discrete-time MASs

distributed Real-time Temperature and Energy control of Energy Efficient Buildings via Geothermal Heat Pumps

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CSEE Journal of Power and Energy Systems 2023年第6期9卷 2289-2300页

作者： Xiaotian Wang Lei Liang Xuan Zhang Hongbin Sun Tsinghua-Berkeley Shenzhen Institute Tsinghua UniversityShenzhenChina Department of Electrical Engineering Tsinghua UniversityBeijingChina

Geothermal heat pumps(GHPs)are a type of heating ventilation and air conditioning(HVAC)systems that use low-temperature resources from soil and groundwater for heating/cooling.In recent years,there has been an increasing interest in GHP systems due to their high energy efficiency and abundant geothermal resources.Thus,the optimization and control design of the GHP system has become a hot topic.On the other hand,as the GHP system is an ideal respon-sive load,mechanism design for the GHP system to realize demand response(DR)in a virtual power plant(VPP)without affecting user comfort is particularly essential.In this paper,we propose a distributed real-time temperature and energy management method via GHP systems for multi-buildings,where both floor and radiator heating/cooling distribution subsystems in multiple thermal zones are considered.We design an energy demand response mechanism for a single GHP to track the given energy consumption command for participating in VPP aggregation/disaggregation.Besides,a coordination mechanism for multiple GHPs is designed for the community-level oper-ator in joining VPP aggregation/disaggregation.Both designed schemes are scalable and do not need to measure or predict any exogenous disturbances such as outdoor temperature and heating disturbances from external sources,e.g.,user activity and device operation.Finally,four numerical examples for the simulation of two different scenarios demonstrate the effectiveness of the proposed methods.

关键词： Building temperature and energy management disaggregation distributed control GHP HVAC VPP

distributed DC-Bus Signaling control of Photovoltaic Systems in Islanded DC Microgrid

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CSEE Journal of Power and Energy Systems 2022年第6期8卷 1741-1750页

作者： Noushin Poursafar M.J.Hossain Seyedfoad Taghizadeh Macquarie University SydneyNew South WalesAustralia

The stability of an islanded DC microgrid(DCMG)is highly dependent on the presence and performance of the backup energy storage system(BESS),due to the lack of main grid support.This condition makes the DCMG vulnerable to the critical situation of absence of the BESS,which could be caused by a fault or being fully charged or flat.This paper presents an enhanced distributed DC-bus signaling control strategy for converters of photovoltaic systems(PVs)to make the islanded DCMG less dependent on the BESS.Unlike a conventional control approach that utilizes PVs to operate in maximum power point tracking(MPPT)mode and the BESS solely regulating DC-bus voltage,the proposed control method maintains DC-bus voltage via intelligently managing output powers of the PVs.The proposed control method continuously monitors DC-bus voltage and regulates the output powers of all the PVs via switching between MPPT mode and voltage regulating mode.Accordingly,if the DC-bus voltage level is less than a predefined maximum level,the PVs work in MPPT mode;otherwise,the PVs work in voltage regulating mode to maintain DC-bus voltage at an acceptable range.Such switching between MPPT and voltage regulating control operations results in protecting the DCMG from unavoidable shutdowns conventionally necessary during the absence of the BESS unit.Moreover,the proposed control method reduces oscillations on the DC-bus voltage during existence of the BESS.The performance and effectiveness of the proposed control strategy are validated through different case studies in MATLAB/Simulink.

关键词： DC microgrid voltage stability islanding mode distributed control distributed generator(DG)

Optimal Cooperative Secondary control for Islanded DC Microgrids via a Fully Actuated Approach

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IEEE/CAA Journal of Automatica Sinica 2024年第2期11卷 405-417页

作者： Yi Yu Guo-Ping Liu Yi Huang Peng Shi IEEE Shenzhen Key Laboratory of control Theory and Intelligent Systems Southern University of Science and TechnologyShenzhen 518055China School of Electrical Engineering and Automation Wuhan UniversityWuhan 430072China School of Electrical and Mechanical Engineering the University of AdelaideSA 5005Australia Research and Innovation Centre Obuda University1034 BudapestHungary

DC-DC converter-based multi-bus DC microgrids(MGs) in series have received much attention, where the conflict between voltage recovery and current balancing has been a hot topic. The lack of models that accurately portray the electrical characteristics of actual MGs while is controller design-friendly has kept the issue active. To this end, this paper establishes a large-signal model containing the comprehensive dynamical behavior of the DC MGs based on the theory of high-order fully actuated systems, and proposes distributed optimal control based on this. The proposed secondary control method can achieve the two goals of voltage recovery and current sharing for multi-bus DC MGs. Additionally, the simple structure of the proposed approach is similar to one based on droop control, which allows this control technique to be easily implemented in a variety of modern microgrids with different configurations. In contrast to existing studies, the process of controller design in this paper is closely tied to the actual dynamics of the MGs. It is a prominent feature that enables engineers to customize the performance metrics of the system. In addition, the analysis of the stability of the closed-loop DC microgrid system, as well as the optimality and consensus of current sharing are given. Finally, a scaled-down solar and battery-based microgrid prototype with maximum power point tracking controller is developed in the laboratory to experimentally test the efficacy of the proposed control method.

关键词： DC microgrids distributed control high-order fully actuated system approach linear quadratic regulator microgrid modeling secondary control