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检索条件"作者=P.R.China 3 Department of Engineering"

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Study on IMC-pID Control for Single-phase Voltage-Source Inverters

Study on IMC-PID Control for Single-phase Voltage-Source Inv...

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2009 IEEE 6th International power Electronics and Motion Control Conference-ECCE Asia

作者： Ding Wenfang1 Huang Qun2 Xu Yingnian3 1. department of Electrical engineering Hubei University of Technology Wuhan 430068 p.r.china 2. Wuhan Digital engineering Institute Wuhan 430074 p.r.china 3. department of Electrical engineering Huazhong University of Science and Technology Wuhan 430074 p.r.china

A novel control scheme with pD output voltage instantaneous-value feedback inner loop for voltage-source inverter is proposed. The inner loop is designed to improve dynamic performance and the IMC-pID （internal model control-proportion integral derivation） external loop can ensure stable performance. The design methods of inner loop pD controller based on pole-assignment and external loop IMC-pID controller are discussed in detail. Simulation and experimental results are given to validate that the control scheme for voltage-source inverter proposed has not only nice dynamic and static performance but also strong robustness. The control scheme proposed has not only strong robustness, nice dynamic and static characteristics, but also easy to realization of the control algorithm in analog or digital.

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A Connectivity-preserving Flocking Algorithm for Nonlinear Multi-Agent Systems With Bounded potential Function

A Connectivity-Preserving Flocking Algorithm for Nonlinear M...

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第三十届中国控制会议

作者： WEN Guanghui~1,DUAN Zhisheng~1,SU Housheng~2,CHEN Guanrong~3,YU Wenwu~4 1.department of Mechanics and Aerospace engineering,College of engineering,peking University,Beijing 100871,p.r.china 2.department of Control Science and engineering,Huazhong University of Science and Technology,Wuhan 430074,p.r.china 3.department of Electronic engineering,City University of Hong Kong,Hong Kong,p.r.china 4.department of Mathematics,Southeast University,Nanjing 210096,p.r.china

＜正＞Without assuming that the communication topology can maintain its connectivity frequently enough during the evolution of agents,the flocking problem of multi-agent systems with second-order nonlinear dynamics is investigated in this paper. By combining the ideas of collective potential functions and velocity consensus,a connectivity-preserving flocking algorithm with bounded potential function is *** tools from algebraic graph theory and matrix analysis,it is shown that the present algorithm can enable the group of multiple agents to move with the same velocity while preserving the connectivity of the whole network if the the algebraic connectivity of the initial network is larger than a threshold ***,the flocking algorithm is used to solve the flocking problem of multi-agent systems with a virtual leader by adding a navigation feedback *** this case,each informed agent only has partial velocity information about the leader,yet the present algorithm not only can guarantee the velocity of the whole group to track that of the leader asymptotically,and also can preserve the connectivity of the ***,simulation results are provided to valid the effectiveness of the theoretical results.

关键词： Multi-Agent System Flocking Nonlinear Dynamics preserving Connectivity Virtual Leader

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Development of Digital Constant Frequency Shift-phase power regulation Series resonant Inverter Source

Development of Digital Constant Frequency Shift-phase Power ...

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2009 IEEE 6th International power Electronics and Motion Control Conference-ECCE Asia

作者： Ding wenfang1 Zhao Yang1 Zhou ping2 Xu yingnian3 1. department of Electrical engineering Hubei University of Technology Wuhan 430068 p.r.china 2. Wuhan Nanhua Industrial Equipments engineering CO. LTD. Wuhan 430223 p.r.china 3. department of Electrical engineering Huazhong University of Science and Technology Wuhan 430074 p.r.china

When two or more inductive heating coils are near and their sources are operating with different switching frequency, low-frequency noise occurs. In order to avoid such noises, this paper presents the constant frequency shift-phase power regulation for series resonant inverters. Leading leg switches always work at ZVS. Lagging leg switches work at ZCS when shift phase angle is bigger than load impedance angle, otherwise lagging leg switches work at ZVS. This paper analyses switch modes in detail, and presents choice principles of capacitance which paralleled with leading leg switches and corresponding experiment waveforms. Long-term practical engineering operation results show that this new power modulation can eliminate audible noises, decrease switch loss, and improve reliability, which has enormous engineering application value.

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reliability Analysis of a repairable System with repairmen Selected randomly

Reliability Analysis of a Repairable System with Repairmen S...

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第二十九届中国控制会议

作者： GUO Lina1,3,TAO Youde2,3,XU Houbao4,GAO Chao51.department of Mathematics,Taiyuan University of Technology,Taiyuan,030024,p.r.china 2.College of Mathematics and Information Science,Xinyang Normal University,Xinyang 464000,p.r.china 3.department of engineering,Beijing Institute of Information and Control,Beijing 100037,p.r.china4.department of Mathematics,Beijing Institute of Technology,Beijing 100081,p.r.china 5.department of Mathematics,Yanbian University,Yanji 133002,p.r.china

In this paper,we deal with a repairable system with repairmen whom can be selected *** reliability study,it is ordinary to substitute the steady-state reliability indices for dynamic ones because the time-dependent solution is difficult to *** this replacement should be based on some conditions in *** it is important to study the unique existence and the expression of the dynamic solution and it is the same with its *** paper is devoted to studying the unique existence of the dynamic solution of the system by C0-semigroup theory and discussing its exponential stability by analyzing thespectra distribution of the system operator and its *** reliability indices of the system are discussed witha different method from traditional one,which is simpler when considering the steady-state indices.

关键词： Transient Solution Steady-state Solution C0-semigroup Theory Exponential Stability reliability Indices

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Stability and Control of Bifurcation in XCp Networks

Stability and Control of Bifurcation in XCP Networks

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第三十届中国控制会议

作者： LIU Feng~(1,2,4),GUAN Zhi-Hong~1,WANG Hua O.~3,ZHU Guangxi~4 1.department of Control Science and engineering,Huazhong University of science and technology,Wuhan 430074,p.r.china 2.department of Electronic Information and Mechanics,china University of Geosciences,Wuhan 430074,p.r.china 3.department of Mechanical engineering,Boston University,Boston,MA02215,USA 4.Electronics and Information engineering,Huazhong University of science and technology,Wuhan 430074,p.r.china

In this paper,the nonlinear dynamical of XCp for Internet congestion control system is investigated,we study the effects of system parameters on nonlinear dynamical behavior and the condition for bifurcation *** impulsive controller will be proposed for controlling bifurcation in this *** simulation verified the validity of this control method.

关键词： Stability Control Bifurcation XCp Networks

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Stabilization of Switched Nonlinear Differential Algebraic Systems and Application to power Systems with OLTC

Stabilization of Switched Nonlinear Differential Algebraic S...

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第三十届中国控制会议

作者： LI Jianyong~1,LIU Yanhong~2,WANG Dezhen~2,CHU Bing~3 1.School of Computer & Communication engineering,Zhengzhou University of Light Industry,Zhengzhou 450002,p.r.china 2.School of Electrical engineering,Zhengzhou University,Zhengzhou 450001,p.r.china 3.department of engineering Science,University of Oxford,Oxford OXl 3pJ,U.K.

＜正＞This paper investigates the stabilization of switched nonlinear differential algebraic systems and its application in power ***,we give some preliminary results on the dissipative Hamiltonian realization of switched nonlinear differential algebraic ***,by using Hamiltonian functions of the relative subsystems as multiple Lyapunov functions,we propose some sufficient conditions for the stability and stabilization of dissipative switched nonlinear differential algebraic systems. The results is successfully applied to the stabilization of power systems connected with on-load tap changer（OLTC）.With the assistant of the dissipative Hamiltonian realization of the considered power systems,we proposed a stabilization controller to improve the transient stability of the *** results verify the effectiveness of the proposed control scheme.

关键词： Switched nonlinear differential algebraic system Dissipative Hamiltonian realization Stabilization power systems OLTC

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Microstructure and properties of thermal sprayed NiCrWrE Coatings

Microstructure and properties of thermal sprayed NiCrWRE Coa...

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Fifth International Conference on Surface engineering

作者： Zhenyu Zhang1 Zhiping Wang2 Bunv Liang1 Hongbiao Dong3 1 Mechanical engineering department Lanzhou polytechnic College Lanzhou Gansu 730050 p.r.china 2 State Key Laboratory of New Nonferrous Metal Materials Lanzhou University of Technology Lanzhou Gansu 730050 p.r.china 3 department of engineering University of Leicester Leicester LE1 7rH UK

NiCrWrE alloy powders were produced by gas atomization in argon atmosphere,the powders with CeO2 are fine,spheroidal and well *** alloy coatings were produced on to a medium-carbon steel substrate by thermal spray *** microstructure and tribological behavior of coatings were studied experimentally by means of scanning electron microscopy（SEM）,field emission gun scanning electron microscope（FEGSEM） and wear *** results show that the addition of CeO2 modifies the coating morphology from a needle like structure to a roughly cubic morphology,the refining and purifying effect of rare earth elements makes the microstructure more compact and *** CeO2 increases the plasticity and hardness of the coatings,increases the adhesive strength between the hard phase and the matrix,effectively protect boron which forms hard phases,and so result in better wear *** addition,dispersal hard phases in Ni-Fe solid solution tend to be well distributed in the microstructure with the addition of CeO2,which could account for improvement of the hardness and wear resistance of the *** of the worn surfaces revealed that the coatings with CeO2 addition show improved abrasive wear resistance over the coatings without *** adding CeO2,the hardness of the coatings was significantly increased,and the wear resistance of coatings was *** NiCrWrE alloy is now successfully being used for coating an oil slurry pump.

关键词： NiCrWrE alloy rare earth oxide Microstructure Thermal spray welded Wear resistance

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physical,chemical and microbiological changes in stored green asparagus spears as affected by coating of Silver nanoparticles-pVp

Physical,chemical and microbiological changes in stored gree...

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中国食品科学技术学会第五届年会暨第四届东西方食品业高层论坛

作者： Jianshen Ana~1 Min Zhang~2 Shaojin Wang~3 Juming Tang~3 1 Haitong Food Group Co.,Ltd.Cixi 315300,p.r.china, 2 School of Food Science and Technology,Southern Yangtze University,Wuxi 214036,p.r.china, 3 department of Biological Systems engineering,Washington State University,pullman,WA 99164-6120,USA

Silver nanoparticles have recently gained increasing interests due to their antimicrobial activities in food processing *** aim of this study was to evaluate the effect of silver nanoparticles-pVp coating on weight loss,ascorbic acid,total chlorophyll,crude fiber,color, firmness and microbial qualities of asparagus spears stored at 2℃ and 10℃.Asparagus samples were first sanitized with 100 mg1-1 sodium hypoehloride solution for 15 *** were then immersed in coating solution containing silver nanoparticles for 3 minutes at room temperature. During 25-day storage at 2 or 10℃,the coated asparagus demonstrated lower weight Ioss, greener color and tender texture compared with the control *** growth of microorganism was significantly hindered by the *** on comprehensive comparison and evaluation, asparagus spears coated by silver nanoparticles could be kept in good quality for 25 days at 2℃ and 20 days at 10℃.

关键词： Asparagus officinalis L. silver nanoparticles polyvinylpyrrolidone coating storage quality

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Design of Model predictive Controller for Anti-Jerk During Tip-in/out process of Vehicles

Design of Model Predictive Controller for Anti-Jerk During T...

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第三十届中国控制会议

作者： LU Xiaohui~(1,2),CHEN Hong~(1,2*),ZHANG Huayu~2,WANG ping~(1,2),GAO Bingzhao~(1,3) 1.State Key Laboratory of Automobile Dynamic Simulation,Jilin University,Changchun 130025,p.r.china 2.department of Control Science and engineering,Jilin University,Changchun 130025,p.r.china 3.department of Mechanical engineering,Yokohama National University,Japan

In this paper,a model predictive controller is proposed for anti-jerk during the tip-in/out process of the *** contradictive control objectives of smooth acceleration/deceleration and satisfying the driver’s torque request are included in the objective function,which aims to improve driving comfort and guarantee fast dynamic *** to the physical characteristics, the maximum frequency response amplitude of engine as actuator is considered explicitly in the problem *** designed constrained model predictive controller is tested in the nominal conditions and the changed *** simulations illustrate the efficiency of the proposed *** the same time,the closed-loop system has ability to reject uncertainties, such as road grade.

关键词： Model predictive Control Anti-Jerk Dynamics Driveline

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Experiment on CO2 reforming CH4 by Atmospheric pressure Non-thermal plasma Jet

Experiment on CO2 Reforming CH4 by Atmospheric Pressure Non-...

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第十四届全国等离子体科学技术会议暨第五届中国电推进技术学术研讨会

作者： Xiang Li~(1,2),Xumei Tao~1,Shuyong Shang~(1,3),Yongxiang Yin~1,Xiaoyan Dai~1 1.Center of plasma Application,School of Chemical engineering,Sichuan University,Chengdu,Sichuan 610065,p.r.china 2.College of Science,Southwest University of Science and Technology,Mianyang,Sichuan,621010, p.r.china 3.department of Chemical engineering,Yibin University,Yibin,Sichuan,644007,p.r.china Corresponding author:prof.Dr.Yongxiang Yin

Atmospheric pressure plasmas can provide a critical advantage over the widely used low pressure plasmas,as they do not require expensive and complicated vacuum *** has prompted recent development of a number of novel atmospheric pressure plasmas sources including the atmospheric pressure plasma jet,the cold plasma torch,the one atmospheric

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