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机床与液压 2016年第6期44卷 25-29页

作者： Xiao-xia GUO Tao- tao LI Jia-hai HUANG Long QUAN Sheng-guo WANG Key Lab of Advanced Transducers and Intelligent Control System Ministry of Education and Shanxi Province Taiyuan University of Technology Taiyuan 030024 China Technology Center of Taiyuan Heavey Machinery Group Yuci Hydraulic Industry Yuci 030600 China

Flow control valve generally consists of constant pressure difference reducing valve and throttle *** it works under the condition of high differential pressure and flow, the pressure loss of reducing valve in-stalled in main loop will get increased and the hydraulic oil temperature will be increased as well. A digital pilotflow control valve is studied in this paper. The main stage is a cartridge valve based on the flow amplifying princi-ple. The pilot stage is digital flow control valve which consists of digital valve and constant pressure difference re-ducing valve. The digital valve controlled by PWM signal has some characteristics such as less throttling loss andgood repeatability. The high pressure loss and hydraulic oil temperature will be effectively reduced by using con-stant pressure difference reducing valve in the small flow pilot circuit. Through theoretical derivation and simula-tion research, the feasibility of this valve is verified, and some conclusions are drawn for the relationships betweenthe performance and structure parameters, which provides theoretical basis for their design.

关键词： Digital flow control valve Pilot control Simulation

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Chance-Constrained Programming Model for Reference Network With Wind Power Integration

Chance-Constrained Programming Model for Reference Network W...

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IEEE Conference on Energy Internet and Energy system Integration

作者： Donglei Sun Jinhong Yang Xueshan Han Junxiong Wang Xin Tian Bin Yang Lina Zhang Nan Wang Economic & Technology Research Institute of State Grid Shandong Electric Power Company State Grid Shandong Electric Power Maintenance Company Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education (Shandong University)

ISBN: (纸本)9781538614280

With the large-scale integration of volatile wind power generations, power system operation and planning face the problem of increasing injection fluctuations and uncertainties. In this paper, chance constraint expressions are used to characterize the wind power uncertainty, and then a new chance-constrained programming model for reference network with wind power integration is proposed to ensure the expected wind power utilization. In the proposed model, the objective function is minimizing total power generation cost and transmission investment cost, and the constraints are the safety operation technical requirements under intact operation state and the preconceived contingency operation state. The sample average approximation (SAA) method is used to develop a deterministic approach for the proposed model. Numerical analysis shows the potential benefit of the proposed model.

关键词： Reference network Wind power integration Power grid evaluation Chance constraints Sample-average approximation (SAA)

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Experimental investigation of a UWB direct chaotic through-wall imaging radar using colpitts oscillator

Experimental investigation of a UWB direct chaotic through-w...

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IET International Radar Conference 2015

作者： Liu, L. Ma, R.X. Xu, H. Wang, W.K. Wang, B.J. Li, J.X. Key Lab of Advanced Transducers and Intelligent Control System Ministry of Education Shanxi Province China Taiyuan University of Technology Taiyuan030024 China

ISBN: (纸本)9781785610387

An ultra-wideband direct chaotic through-wall imaging radar is proposed and experimentally demonstrated. The chaotic signal is generated by an improved Colpitis oscillator. Target range information is achieved by the cross-correlation between the time-delayed reflected echo signal and the replica of the transmitted chaotic signal. Two-dimensional image is obtained by synthetic aperture technology and back projection algorithm. Experimental results of single target and double targets show that the proposed chaotic radar system can through 20cm thick wall to detect and locate the target.

关键词： Computerized tomography

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Comparison of three stability analysis methods for delayed cyber-physical power system

Comparison of three stability analysis methods for delayed c...

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China International Conference on Electricity Distribution, CICED

作者： Weikang Gao Hua Ye Yutian Liu Liang Wang Wenbin Ci Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education (Shandong University) Ji'nan China Shandong Electric Power Dispatch and Control Center Ji'nan China

ISBN: (纸本)9781467390712

The power system with wide-area damping controllers (WADC) embedded is essentially complex delayed cyber-physical power system (DCPPS) since time delays are introduced during transmitting and processing wide-area measurements. In this paper, three methods for stability analysis of DCPPS, i.e., delay-dependent stability criterion in the time domain, Padé approximation-based method as well as explicit infinitesimal generator discretization-based method (EIGD) in the frequency domain are extensively compared from both theoretical and numerical analysis in terms of conservativeness, accuracy, scalability and the capability of handling multiple delays. Simulation results reveals that: (1) The conservativeness in delay margin derived by delay-dependent stability criterion reaches to 7.09% for the two-area four-machine test system. (2) Padé approximation-based eigen-analysis method is sufficiently accurate even a low order of the approximation, e.g., 3 rd order, is used. (3) Padé approximation-based eigen-analysis method is more efficient than EIGD for small stability analysis of large DCPPS.

关键词： Power system stability Stability criteria Numerical stability Delays Delay effects Asymptotic stability

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Fault detection and identification for a class of nonlinear systems with model uncertainty

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Applied Mathematical Modelling 2016年第15-16期40卷 7368-7381页

作者： Bingyong Yan Housheng Su Wei Ma School of Automation Key Laboratory of Advanced Control and Optimization for Chemical Process of Ministry of Education East China University of Science and Technology 130 Meilong Road Shanghai 200237 China School of Automation Key Laboratory of Image Processing and Intelligent Control of Ministry of Education of China Huazhong University of Science and Technology Wuhan 430074 China Key Laboratory for Advanced Materials & Institute of Fine Chemicals East China University of Science and Technology 130 Meilong Road Shanghai 200237 China

In this paper, we present a novel fault detection and identification (FDI) scheme for a class of nonlinear systems with model uncertainty. At the heart of this approach is an on-line approximator, referred to as fault tracking approximator (FTA). Differently from the other approximators, the FTA uses iterative algorithms to detect and identify nonlinear system faults, even in the presence of model uncertainty, which is motivated by predictive control theory and iterative learning control theory. The FTA can simultaneously detect and identify the shape and magnitude of the faults. The rigorous stability analysis and fault tracking properties of the FTA are also proved. Finally, two examples are given to illustrate the feasibility and effectiveness of the proposed approach.

关键词： Fault detection and identification Predictive control Iterative learning control

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An overview of coordinated control for multi-agent systems subject to input saturation

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Perspectives in Science 2016年 7卷 133-139页

作者： Xiaoling Wang Housheng Su Xiaofan Wang Guanrong Chen Department of Automation Shanghai Jiao Tong University and Key Laboratory of System Control and Information Processing Ministry of Education of China Shanghai 200240 China School of Automation Image Processing and Intelligent Control Key Laboratory of Education Ministry of China Huazhong University of Science and Technology Wuhan 430074 China Department of Electronic Engineering City University of Hong Kong Hong Kong China

Coordinated control of multi-agent systems has widespread application in engineering such as unmanned aerial vehicles and unmanned ground vehicles. Due to the fact that input saturation can lead a control system to deterioration and instability, a lot of efforts have been devoted to investigating this subject of great importance. The present article offers a survey of recent developments on coordinated control of multi-agents systems subject to input saturation. Some preliminaries about graph theory, stability theory and input saturation are first provided, followed by some important results in the area, which are categorized into semi-global and global coordinated controls. Future research topics are finally discussed.

关键词： Multi-agent system Coordinated control Consensus tracking Input saturation Low-and-high-gain feedback

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Nonnegative Edge Consensus of Networked Linear systems

Nonnegative Edge Consensus of Networked Linear Systems

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第35届中国控制会议

作者： Xiaoling Wang Housheng Su Xiaofan Wang Guanrong Chen Department of Automation Shanghai Jiaotong Universityand Key Laboratory of System Control and Information ProcessingMinistry of Education of China School of Automation Image Processing and Intelligent Control Key Laboratory of Education Ministry of ChinaHuazhong University of Science and Technology Department of Electronic Engineering City University of Hong Kong

ISBN: (纸本)9781509009107

In this paper,nonnegative edge consensus of systems steered by general linear dynamics on directed network is *** the new approach,one first endows dynamics to each directed edge and then designs a distributed edge consensus protocol guiding all edges to reach a common *** the help of line graph theory,it is proved that strongly connected network can ensure reaching nonnegative edge consensus,if the initial conditions of all edges are *** simulations are provided to verify the theoretical results.

关键词： Networked system Nonnegative edge consensus Distributed algorithm Line graph

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MoS2 heterostructure with tunable phase stability: Strain induced interlayer covalent bond formation

arXiv

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arXiv 2017年

作者： Ouyang, Bin Xiong, Shiyun Yang, Zhi Jing, Yuhang Wang, Yongjie National Center for Supercomputing Applications University of Illinois at Urbana-Champaign UrbanaIL61801 United States Collaborative Innovation Center of Suzhou Nano Science and Technology Soochow University Suzhou JiangSu215123 China College of Physics and Optoelectronics Taiyuan University of Technology Taiyuan ShanXi030024 China Key Lab of Advanced Transducers and Intelligent Control System Ministry of Education and Shanxi Province Taiyuan University of Technology Taiyuan ShanXi030024 China Department of Astronautical Science and Mechanics Harbin Institute of Technology Harbin Heilongjiang150001 China Beckman Institute for Advanced Science and Technology University of Illinois at Urbana-Champaign UrbanaIL61801 United States Department of Electrical Engineering and Computer Engineering University of Michigan Ann ArborMI48109 United States

Due to the distinguished properties offered by different structural phases of monolayer MoS2, phase engineering design are urgently required for achieving switchable structural phase. Strain engineering is widely accepted as a clean and flexible method, however, can not be achieved in engineering monolayer MoS2 phase transition because the critical biaxial strain required (~15%) is much larger than measured elastic limit (~11%). In this study, employing density functional theoretical calculations, it has been found out that with the forming of heterostructure between MoS2 with buckled 2D materials such as silicence, germanene and stanene, only a small strain can trigger the phase transition. As being suggested by the constructed phase stability diagram, biaxial deformation as low as 3% in MoS2/silicene and MoS2/stanene sandwich structure, would be sufficient to induce the structural phase transition in MoS2 lattice. This strain falls well within experimental elastic limit, thus would be feasible to realize in experiment. The origin of such behavior can be understood as strain induced interlayer covalent bond formation, which finally make MoS2 lattice more sensitive to external strain. This theoretical work provides one realistic route for achieving flexible phase stabilities in experimental design. Copyright © 2017, The Authors. All rights reserved.

关键词： Molybdenum compounds

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Hybrid wind-PV system capacity limit calculation of based on constraint transformer

Hybrid wind-PV system capacity limit calculation of based on...

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China International Conference on Electricity Distribution, CICED

作者： Yifei Guo Houlei Gao Zhigang Wu Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Shandong University Jinan China State Grid Shandong Electrical Power Company Jinan China

ISBN: (纸本)9781467390712

Aiming at the hybrid wind-PV system planning problem, a optimization model of installed capacity is proposed in this paper with the constraint of main transformer. Firstly, to account for the stochastic nature of wind and solar resource, by use of ARMA model and Fuzzy C-means(FCM) algorithm, a full-year time series models of wind power, photovoltaic(PV) power are presented. Then, using main transformer utilization, the complementarity of wind and solar energy resource is quantified. And based on the chance-constrained programming, the calculation models are respectively built for two common kinds of planning problem. With an actual case in Shandong province, the problems of wind and solar accommodation and the optimal proportion are calculated and analyzed. The results demonstrate the effectiveness of the proposed method in improving the renewable energy resource utilization.

关键词： Wind speed Planning Wind power generation Solar radiation Wind farms Load modeling

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A controlled islanding scheme considering stability margin of sub-systems after splitting

A controlled islanding scheme considering stability margin o...

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IEEE PES Asia-Pacific Power and Energy Engineering Conference (APPEEC)

作者： Qian Liu Lei Ding Yichen Guo Zhenbin Ma Daonong Zhang Key Laboratory of Power System Intelligent Dispatch and Control Ministry of Education Jinan Shandong Province China North China Power Engineering Co.LTD Beijing China

ISBN: (纸本)9781509054190

Feasible islanding operation can protect power system from blackout under severe contingencies. This paper proposes a controlled islanding scheme taking consideration of the stability margin of the sub-systems after separation. This algorithm includes two steps. Step one judges the necessity of conducting a controlled islanding operation under a scenario by quantified transient analysis of the post-fault power system. Step two estimates the stability margins of post-islanding electrical islands. Compared with other controlled islanding methods, the algorithm proposed in this paper can guarantee the transient stability of the post-islanding stages, which avoids cascading outages happening in the post-islanding sub-systems. A case with IEEE 118 bus system is used to validate the effectiveness the algorithm.

关键词： Transient analysis Video recording Rotors Sun

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