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第30届中国控制与决策会议

作者： Kun Li Bo-Chao Zheng Ju H.Park CICAEET School of Information and Control Nanjing University of Information Science and Technology Key Laboratory of Measurement and Control of Complex Systems of Engineering Ministry of Education School of AutomationSoutheast University Department of Electrical Engineering Yeungnam University

This paper investigates the robust consensus for a class of uncertain linear multi-agent systems. In order to reduce the controller update frequency and the communication load of the network, a consensus algorithm based on event-triggered strategy is proposed and each triggering condition is established using measurement error of each *** the impacts of event-triggered strategy and external disturbances, the event-based sliding mode controller is introduced in this paper, which ensures the sliding-mode bands can be reached in finite time and the aim of robust consensus is achieved. Numerical simulation verifies the effectiveness of the proposed method.

关键词： Sliding-mode control(SMC) robust consensus multi-agent systems event trigger

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Authors’ Response to Peer Reviews of “Emergence of the First Strains of SARS-CoV-2 Lineage B.1.1.7 in Romania: Genomic Analysis”

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JMIRx Med 2021年第3期2卷

作者： Andrei Lobiuc Mihai Dimian Olga Sturdza Roxana Filip Mihai Covasa Department of Human Health and Development College of Physical Exercise and Sport Stefan cel Mare University of Suceava Suceava Romania Department of Computers Electronics and Automation College of Electrical Engineering and Computer Science Stefan cel Mare University of Suceava Suceava Romania Integrated Center for Research Development and Innovation in Advanced Materials Nanotechnologies and Distributed Systems for Fabrication and Control Stefan cel Mare University of Suceava Suceava Romania Suceava County Emergency Hospital Suceava Romania

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Robust Disturbance-Rejection for a Class of Nonlinear systems

Robust Disturbance-Rejection for a Class of Nonlinear System...

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第37届中国控制会议

作者： Pan Yu Kang-Zhi Liu Min Wu Jinhua She Department of Electrical and Electronic Engineering Chiba University Hubei Key Laboratory of Advanced Control and Intelligent Automation for Complex Systems School of Information Science and Engineering Central South University School of Automation China University of Geosciences School of Engineering Tokyo University of Technology

This paper presents a robust disturbance-rejection method for a system with a time-variant nonlinearity and a disturbance. The nonlinear dynamics which satisfies Lipschitz condition is unknown. The disturbance is also unknown but *** advantage of stable inversion, an improved EID(IEID) is utilized to deal with the total effect of the nonlinearity and disturbance. To reduce the conservativeness of system design, a feedback control gain is obtained in prior to the control gains of the observer and the IEID estimator. Then a Lyapunov functional considering the information of the nonlinearity is constructed and based on that, a linear-matrix-inequality(LMI)-based stability condition is derived to acquire the gains of the observer and the IEID estimator. Two tuning parameters are introduced in the LMI to enable the adjustment of disturbance-rejection performance. Finally, simulations for a flight control system show that the developed method has good robustness. Comparisons with disturbance-observer-based control(DOBC), composite DOBC and H control, and conventional EID-based control methods demonstrate the effectiveness of the developed method and its advantages over others.

关键词： Disturbance-rejection improved equivalent-input-disturbance（EID） linear matrix inequality（LMI） nonlinear system robustness

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Robust Disturbance Rejection in Repetitive-control System Based on Improved Equivalent-Input-Disturbance Approach 36

Robust Disturbance Rejection in Repetitive-Control System Ba...

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第36届中国控制会议

作者： Lan Zhou Jinhua She Changzhong Pan School of Information and Electrical Engineering Hunan University of Science and Technology School of Engineering Tokyo University of Technology School of Automation China University of Geosciences Hubei Key Laboratory of Advanced Control and Intelligent Automation for Complex Systems

ISBN: (纸本)9781538629185

This paper concerns disturbance rejection for a repetitive-control system（RCS） with unknown time-varying uncertainties and nonlinearity. The design of the RCS is based on the concept of equivalent input disturbance（EID）. First, an EID estimator is constructed through a state observer with dynamic coefficient matrix that effectively estimates the total effect of the uncertainties and nonlinearity on the output of the plant. Next, a robust globally uniformly ultimately bounded stability condition for the EID-based RCS is derived in the form of a linear matrix inequality. Then, the methods of designing a modified repetitive controller, a state-feedback controller, and an EID estimator are explained. Finally, simulation results demonstrate the validity of the method.

关键词： Repetitive control Equivalent Input Disturbance Disturbance Rejecting Two-dimensional System Linear Matrix Inequality

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$H_{\infty}$ Fault Estimation for 2-D Linear Discrete Time-Varying systems Based on Krein Space Method

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IEEE Transactions on systems, Man, and Cybernetics: systems 2018年第12期48卷 2070-2079页

作者： Dong Zhao Youqing Wang Yueyang Li Steven X. Ding College of Information Science and Technology Beijing University of Chemical Technology Beijing China College of Electrical Engineering and Automation Shandong University of Science and Technology Qingdao China School of Electrical Engineering University of Jinan Jinan China Institute for Automatic Control and Complex Systems (AKS) University of Duisburg–Essen Duisburg Germany

This paper addresses the finite horizon H ∞ fault estimation problem for 2-D linear discrete time-varying systems with bounded unknown input and measurement noise. The main contribution of this paper is the H ∞ fault estimator for 2-D systems with a necessary and sufficient existence condition. By introducing a partially equivalent stochastic dynamic system in Krein space, the necessary and sufficient condition for the existence of the H ∞ fault estimator is derived based on innovation analysis and projection formula in Krein space. Then, the solution of the estimator is achieved by means of a Riccati-like difference equation for 2-D systems. Finally, a thermal process example is given to demonstrate the effectiveness of the proposed method.

关键词： Estimation Time-varying systems Boundary conditions Technological innovation Difference equations Symmetric matrices Hafnium

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Design Simulation and Structure Optimization of Plunger Assembly Closing

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Journal of Physics: Conference Series 2021年第1期2029卷

作者： Weizhi Qiao Zhenyu Wang Xiang Gao Xiaochao Liu Zhongyi Qiu Yanze Hou Chong Chen Ningbo Institute of Technology Beihang University Ningbo Zhejiang 315800 China School of Automation Science and Electrical Engineering Beihang University Beijing 100191 China Science and Technology on Aircraft Control Laboratory Beihang University Beijing 100191 China State Key Laboratory of Fluid Power and Mechatronic Systems Zhejiang University Hangzhou Zhejiang 310027 China Research Institute for Frontier Science Beihang University Beijing 100191 China Qian Xuesen Laboratory of Space Technology China Academy of Space Technology Beijing 100094 China

Hydraulic motors and pumps are the core components in hydraulic systems. The plunger assembly is a key component for the realization of the function of the axial piston pump and motor. The coupling between the slipper and the plunger body is completed through the closing process. With the application of computational science and finite element technology, DEFORM-3D metal forming process simulation is used to establish the corresponding closing device model of the plunger assembly. Through simulation, we analyze the change law of metal flow during plastic deformation process, and carry out structural optimization design based on the simulation results. We found that the closing is completed under the appropriate cone angle and distance line of the shoe, the quality is relatively uniform, and there is no closing defects such as metal flow overflow and cracks. The pull-off force and the clearance value after rolling can meet the design requirements. This method not only can effectively shorten the product verification cycle and reduce the cost, but also can reduce the defects of the finished product and improve the yield rate, providing a new way for the design of the closing structure and closing model of the plunger assembly.

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Emergence of the First Strains of SARS-CoV-2 Lineage B.1.1.7 in Romania: Genomic Analysis

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JMIRx med 2021年第3期2卷 e28049页

作者： Andrei Lobiuc Mihai Dimian Olga Sturdza Roxana Filip Mihai Covasa Department of Human Health and Development College of Physical Exercise and Sport Stefan cel Mare University of Suceava Suceava Romania. Department of Computers Electronics and Automation College of Electrical Engineering and Computer Science Stefan cel Mare University of Suceava Suceava Romania. Integrated Center for Research Development and Innovation in Advanced Materials Nanotechnologies and Distributed Systems for Fabrication and Control Stefan cel Mare University of Suceava Suceava Romania. Suceava County Emergency Hospital Suceava Romania.

BACKGROUND:The United Kingdom reported the emergence of a new and highly transmissible SARS-CoV-2 variant (B.1.1.7) that rapidly spread to other countries. The impact of this new mutation-which occurs in the S protein-on infectivity, virulence, and current vaccine effectiveness is still under evaluation. OBJECTIVE:The aim of this study is to sequence SARS-CoV-2 samples of cases in Romania to detect the B.1.1.7 variant and compare these samples with sequences submitted to GISAID. METHODS:SARS-CoV-2 samples were sequenced and amino acid substitution analysis was performed using the CoV-GLUE platform. RESULTS:We have identified the first cases of the B.1.1.7 variant in samples collected from Romanian patients, of which one was traced to the region of the United Kingdom where the new variant was originally sequenced. Mutations in nonstructural protein 3 (Nsp3; N844S and D455N) and ORF3a (L15F) were also detected, indicating common ancestry with UK strains as well as remote connections with strains from Nagasaki, Japan. CONCLUSIONS:These results indicate, for the first time, the presence and characteristics of the new variant B.1.1.7 in Romania and underscore the need for increased genomic sequencing in patients with confirmed COVID-19.

关键词： COVID-19 Romania case study epidemiology genetics genome impact infectious disease lineage mutation sequencing spread strain transmission variant virology virus

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The design of special energy conversion device of integrated self-powered brake system

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Journal of Physics: Conference Series 2021年第1期2029卷

作者： Weizhi Qiao Ding-bo Li Xiang Gao Xiaochao Liu Hao Zhang Renjie Li Xiyu Wang Yanze Hou Chong Chen Ningbo Institute of Technology Beihang University Ningbo 315800 China School of Automation Science and Electrical Engineering Beihang University Beijing 100191 China Science and Technology on Aircraft Control Laboratory Beihang University Beijing 100191 China State Key Laboratory of Fluid Power and Mechatronic Systems Zhejiang University Hangzhou 310027 China Research Institute for Frontier Science Beihang University Beijing 100191 China Qian Xuesen Laboratory of Space Technology China Academy of Space Technology Beijing 100094 China

In recent years, a novel electro-hydraulic integrated self-powered brake system for aircraft has been proposed. A modular "self-powered device" is installed near the wheel to recover the rotational kinetic energy when the wheel lands and convert it into hydraulic energy for braking. The energy conversion device is the compact high-power-weight ratio energy harvesting mechanism, which needs to be designed in the extremely narrow internal space of the wheel. At the same time to ensure high reliability, high strength, high power weight ratio, difficult, and wheel brake disc internal temperature reaches 600 °C above, this to the design of the can take institutions are challenges. In this paper, the high strength compact high power-weight ratio energy conversion device as the research goal, through new principles, new structure, new materials, new technology, new methods and other means of the energy taking mechanism design and development, and finally achieve the strength, stiffness, reliability, life of the energy conversion device to meet the requirements of the system.

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Modeling and Simulation of Virtual Synchronous Generator for DFIG wind turbine generator

Modeling and Simulation of Virtual Synchronous Generator for...

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International Conference on Renewable Power Generation

作者： Qiongfeng Zhu Ziyu Chen Shouhong Feng Yufeng Wang Bowen Zhang Weilin Li State Key Laboratory of Operation and Control of Renewable Energy & Storage Systems (China Electric Power Research Institute) Beijing China Department of Electrical Engineering School of Automation Northwestern Polytechnical University Xi'an China

ISBN: (数字)9781839531248

ISBN: (纸本)9781839531255

With the rapid development of the wind power generation, the penetration rate of wind power is gradually increasing, which affects the stable operation of the power system. The DFIG wind turbine generator can realize decoupling control of output active and reactive power by vector transformation control. However, under this power control, wind turbines do not have the electromechanical transient characteristics like synchronous generators for supporting the stable operation of the power system. Virtual synchronous generator technology can make the wind power system reflect the operation mechanism and external characteristics of traditional synchronous generators to improve the stability of power system. This paper builds a generic simulation model of current source type DFIG wind turbine generator based on VSG technology, which can simulate a series of VSG behaviors including virtual inertia control, damping control, primary frequency control, reactive power control and fault ride through. The developed simulation model is also validated comparing to the actual wind turbine field testing data, which shows accurate and reliable simulation results. The developed simulation model can provide theoretical and model basis for studying VSG technology and grid integration characteristics.

关键词： MICROGRID VSG DOUBLY-FED WIND GENERATOR DROOP control

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Residential Energy Management with Deep Reinforcement Learning

Residential Energy Management with Deep Reinforcement Learni...

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International Joint Conference on Neural Networks

作者： Zhiqiang Wan Hepeng Li Haibo He Department of Electrical Computer and Biomedical Engineering University of Rhode Island RI USA Lab. of Networked Control Systems Shenyang Institute of Automation Chinese Academy of Sciences Shenyang China

A smart home with battery energy storage can take part in the demand response program. With proper energy management, consumers can purchase more energy at off-peak hours than at on-peak hours, which can reduce the electricity costs and help to balance the electricity demand and supply. However, it is hard to determine an optimal energy management strategy because of the uncertainty of the electricity consumption and the real-time electricity price. In this paper, a deep reinforcement learning based approach has been proposed to solve this residential energy management problem. The proposed approach does not require any knowledge about the uncertainty and can directly learn the optimal energy management strategy based on reinforcement learning. Simulation results demonstrate the effectiveness of the proposed approach.

关键词： Batteries Computer architecture Energy management Load modeling Microprocessors Feature extraction

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