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Consensus-Based Distributed Control with Communication Time Delays for Virtual Synchronous Generators in Isolate Microgrid

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Energy and Power Engineering 2017年第4期9卷 102-111页

作者： Laijun Chen Yuyang Wang Tianwen Zheng Zhenquan Sun State Key Laboratory of Power System Department of Electrical Engineering Tsinghua University Beijing China Key Laboratory of Photovoltaic Power Generation and Grid-connected Technology (Qinghai Electrical Power Research In-stitute Qinghai Electric Power Corporation Xining China) Shaanxi Regional Electric Power Design and Research Institute Xi’an China

A consensus-based distributed control method of coordinated VSGs with communication time delays in isolate microgrid is proposed. When time delays are considered in communication, there are some effects on frequency restoration and active power output allocation. In the control structure, only local information exchange is needed, while the final frequency can be controlled to the nominal value and the VSGs can automatically share loads according to their rated values. An AC microgrid with three VSGs and some loads is implemented. The proposed control strategy is verified by MATLAB/ Simulink simulation results.

关键词： Virtual Synchronous Generator Time Delays Distributed Control Consensus Algorithm

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Energy Optimization Dispatching of Microgrid in The Stand-alone Mode

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Journal of Physics: Conference Series 2019年第1期1304卷

作者： Li Sun Shujian Zhao Chenglian Ma Jing Jiang Yuanzhu Meng Tianliang Yao Key Laboratory of Modern Power System Simulation and Control & Renewable Energy Technology Ministry of Education (Northeast Electric Power University) Jilin Jilin 132012 China Power Research Institute of State Grid Jilin Electric Power Co. Ltd. Changchun Jilin 130021 China Jilin Power Supply Company State Grid Jilin Electric Power Co. Ltd. Jilin Jilin 132001 China Gansu Electric Power Design Institute Limited Company of China Energy Construction Group Lanzhou 730050 China

A microgrid system in the stand-alone mode with photovoltaic, wind turbine, microturbine, fuel cell and energy storage unit is studied. Mathematical models of different distributed power supply and energy storage devices are established. The load demand of the system, the price of purchasing and selling electricity when interacting with the power grid and other constraints are considered. An economic model for optimizing stand-alone operation cost is established. According to the characteristics of the model, an improved genetic algorithm is selected to optimize the nonlinear system. The algorithm has better stability in solving the optimization problem of large state space dimension. The case study show that the proposed economic model is reasonable and the algorithm is effective.

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Economic Optimal Dispatch of Grid-connected Microgrid Based on Improved Genetic Algorithm

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Journal of Physics: Conference Series 2019年第1期1304卷

作者： Li Sun Shujian Zhao Chenglian Ma Naixin Chen Tianliang Yao Key Laboratory of Modern Power System Simulation and Control & Renewable Energy Technology Ministry of Education (Northeast Electric Power University) Jilin Jilin 132012 China Power Research Institute of State Grid Jilin Electric Power Co. Ltd. Changchun Jilin 130021 China Changchun Power Supply Company State Grid Jilin Electric Power Co. Ltd. Changchun Jilin 130000 China Gansu Electric Power Design Institute Limited Company of China Energy Construction Group Lanzhou 730050 China

Nowadays, the demand for energy is expanding, the fossil resources are on the verge of exhaustion, and the ecological environment is getting worse and worse. In this form, this paper studies the economic optimal dispatch of microgrid under the background of energy saving and emission reduction. Firstly, the mathematical model of microgrid composed of distributed power, energy storage devices and loads is established. Secondly, under the background of energy saving and emission reduction, the objective function of multi-objective optimal operation of microgrid is established considering both economic and environmental aspects. Finally, the improved Genetic Algorithm is used to solve the objective function. The results of optimization can reduce microgrid system generation cost.

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A new model for active nucleation site density in boiling systems 3

A new model for active nucleation site density in boiling sy...

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3rd International Topical Meeting on Advances in Thermal Hydraulics 2016, ATH 2016

作者： Li, Quan Avramova, M. Yu, Junchong Jiao, Yongjun Hou, Jason Department of Engineering Physics Tsinghua University Beijing100084 China Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Chengdu610213 China Department of Nuclear Engineering North Carolina State University RaleighNC27695 United States

ISBN: (纸本)9780894487330

A new model for active nucleation site density in boiling systems has been developed. The model is based on parametric analysis of existing experimental data and is a function of wall superheat, pressure, and contact angle. The model is applicable for a wide pressure range - from 0.101 MPa to 19.8 MPa. Preliminary studies of temperature dependency of the contact angle have also been performed. The new model is intended to improve the predictions of the interfacial area concentration in two-fluid models and the wall temperature in subcooled boiling simulations. Validation activities have shown that the active nucleation site density predicted by the new model is in a good agreement with various published experimental data, and have demonstrated the achieved improvements as compared to existing models. © 2016, American Nuclear Society. All rights reserved.

关键词： Contact angle

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Mechanism study and theoretical simulation on heat split phenomenon in dual-cooled annular fuel element

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Annals of Nuclear Energy 2016年 94卷 44-54页

作者： Yangbin Deng Yingwei Wu Yuanming Li Dalin Zhang Wenxi Tian G.H. Su Suizheng Qiu State Key Laboratory of Multiphase Flow in Power Engineering School of Nuclear Science and Technology Xi’an Jiaotong University Xi’an City 710049 China Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Chengdu 610213 China

In this study, the mechanisms that cause heat split, a specific phenomenon in dual-cooled annular fuel elements, were investigated. On the basis of thermal resistance analysis, the developing process of heat split phenomenon was summarized. It was found that thermal expansion, fuel densification, swelling, creep, relocation and fission gas release are the original parameters driving the development of heat split. Due to these factors, thermal resistances for heat flux to internal and external channels change with the operating time, which results in heat split. Furthermore, the theoretical simulation on heat split was performed by FROBA-ANNULAR, which is a coupled thermal–mechanical analysis code for dual-cooled annular fuel elements. key parameters at different burnup stages, including gap size, gap conductance, temperature profile, coolant flux and heat flux were obtained. The calculation result shows that the fraction of heat flux to the internal cooling channel experiences complicated variation at the range of 32.9–39.7%. In addition, it was found that heat split does not match with the coolant split, especially at the lower burnup stage. Asymmetric heat transfer occurred because of the imbalance between heat split and coolant split, resulting in a substantial asymmetric temperature profile. Furthermore, heat split exerts an influence on DBNRs of inner and outer channels, although the computational values were still within the allowable limits.

关键词： Dual-cooled annular fuel Heat split FROBA-ANNULAR code MDNBR

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A unified leader-follower scheme for mobile robots with uncalibrated on-board camera

A unified leader-follower scheme for mobile robots with unca...

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IEEE International Conference on Robotics and Automation (ICRA)

作者： Dejun Guo Hesheng Wang Weidong Chen Ming Liu Zeyang Xia Kam K. Leang DARC (Design Automation Robotics & Control) Lab University of Utah Robotics Center Salt Lake City Utah USA State Key Laboratory of Robotics and System (HIT) Key Laboratory of System Control and Information Processing Ministry of Education of China Department of Automation Shanghai Jiao Tong University Shanghai China Department of Electronics and Computer Engineering Hong Kong University of Science and Technology Hong Kong China Institute of Biomedical and Health Engineering Chinese Academy of Sciences Shenzhen China

This paper studies the problem of image-based leader-follower formation control for mobile robots, where the controller is designed independently of the leader's motion. An adaptive control scheme, which is suitable for both omnidirectional and perspective cameras, is proposed. The proposed approach avoids the need for accurate calibration of the extrinsic parameters of the omnidirectional camera as well as the intrinsic and extrinsic parameters of perspective camera. Additionally, the coefficients of the plane where the feature point moves relative to the camera frame can be uncertain. These uncertain constant parameters are estimated using an adaptive estimator. Uniform Semi-global Practical Asymptotic Stability (USPAS) of the system is shown using the Lyapunov approach. Experimental results are presented to demonstrate the effectiveness of the proposed control scheme.

关键词： Cameras Robot vision systems Kinematics Mobile robots Calibration Automation

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Drilling Power Consumption and Soil Conveying Volume Performances of Lunar Sampling Auger

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Chinese Journal of Mechanical Engineering 2015年第3期28卷 451-459页

作者： TIAN Ye TANG Dewei DENG Zongquan JIANG Shengyuan QUAN Qiquan State Key Laboratory of Robotics and System Harbin Institute of Technology University Research Center of Package Mechanical Design Harbin University of Commerce

The sampling auger used in lunar sampling and return mission is to transmit power and convey soil, and its performance is the key factor of the whole mission. However, there is currently a lack of the optimization research on soil conveying volume and power consumption models in auger structure design. To provide the drilled object, the simulation lunar soil, whose physical and mechanical property is the same as the real soil, is made by reducing soil void ratio. The models are formulated to analyze the influence of auger structure parameters on power consumption and soil conveying volume. To obtain the optimized structure parameters of auger, the multi-objective optimization functions of the maximum soil conveying volume and minimum power consumption are developed. To verify the correctness of the models, the performances of different augers drilling simulation soil are tested. The test results demonstrate that the power consumption of optimized auger is the lowest both in theory and test, and the experimental results of soil conveying volume are in agreement with theoretical analysis. Consequently, a new method for designing a lunar sampling auger is proposed which includes the models of soil conveying volume and transportation power consumption, the optimization of structure parameters and the comparison tests. This method provides a reference for sampling auger designing of the Chinese Lunar Sample Mission.

关键词： lunar sampling optimal design auger soil conveying volume model structure parameter

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Short-term Scheduling of Steam Power system in Iron and Steel Industry under Time-of-use Power Price

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Journal of Iron and Steel Research International 2015年第9期22卷 795-803页

作者： Yu-jiao ZENG Yan-guang SUN State Key Laboratory of Hybrid Process Industry Automation System and Equipment Technology Automation Research and Design Institute of Metallurgical Industry

A generalized formulation for short-term scheduling of steam power system in iron and steel industry under the time-of-use（TOU）power price was presented,with minimization of total operational cost including fuel cost,equipment maintenance cost and the charge of exchange power with main *** model took into account the varying nature of surplus byproduct gas flows,several practical technical constraints and the impact of TOU power *** major types of utility equipments,involving boilers,steam turbines,combined heat and power（CHP）units,and waste heat and energy recovery generators（WHERG）,were separately modeled using thermodynamic balance equations and regression *** order to solve this complex nonlinear optimization model,a new improved particle swarm optimization（IPSO）algorithm was proposed by incorporating time-variant parameters,a selfadaptive mutation scheme and efficient constraint handling ***,a case study for a real industrial example was used for illustrating the model and validating the effectiveness of the proposed approach.

关键词： short-term optimization byproduct gas distribution steam and power dispatch CHP iron and steel industry time-of-use power price

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The Blood Compatibility Challenge

SSRN

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SSRN 2019年

作者： Jaffer, Iqbal H. Weitz, Jeffrey I. Brash, John L. Horbett, Thomas A. Latour, Robert A. Tengvall, Pentti Gorbet, Maud Sperling, Claudia Maitz, Manfred F. Siedlecki, Christopher A. Werner, Carsten Sefton, Michael V. Maitz, Manfred F. Martins, M. Cristina L Grabow, Niels Matschegewski, Claudia Huang, Nan Chaikof, Elliot L. Barbosa, Mário A. Werner, Carsten Thrombosis and Atherosclerosis Research Institute McMaster University 237 Barton Street East HamiltonONL8L 2X2 Canada McMaster University HamiltonON Canada University of Washington SeattleWA United States Clemson University ClemsonSC United States Gothenburg University Gothenburg Sweden Department of System Design Engineering University of Waterloo WaterlooON Canada Institute Biofunctional Polymer Materials Max Bergmann Center of Biomaterials Leibniz-Institut für Polymerforschung Dresden e.V. Dresden Germany Department of Surgery The Pennsylvania State University College of Medicine Hershey PA17033 United States Department of Bioengineering The Pennsylvania State University College of Medicine Hershey PA17033 United States University of Toronto Institute Biofunctional Polymer Materials Max Bergmann Center of Biomaterials Leibniz-Institut für Polymerforschung Dresden e.V. Dresden Germany i3S Instituto de Investigacao e Inovacao em Saude INEB Instituto de Engenharia Bionedica Rua Alfredo Allen 208 Porto4200-135 Portugal ICBAS Instituto de Ciencias Bioedicas Abel Salazar Universidade do Porto Porto Portugal Institut für Biomedizinische Technik Universitätsmedizin Rostock Friedrich-Barnewitz-Str. 4 Rostock18119 Germany Key Laboratory of Advanced Technology for Materials of Education Ministry School of Materials Science and Engineering Southwest Jiaotong University Chengdu610031 China Beth Israel Deaconess Medical Center Harvard Medical School 330 Brookline Avenue BostonMA02115 United States Wyss Institute for Biologically Inspired Engineering Harvard University 3 Blackfan Circle BostonMA02115 United States Harvard-MIT Division of Health Sciences and Technology 77 Massachusetts Avenue CambridgeMA02139 United States

Despite >50 years of study, there are no materials that are considered truly nonthrombogenic. Some materials minimize protein adsorption or cell adhesion while others actively inhibit thrombin generation through heparinization. Nonetheless the problem of biomaterial associated thrombogenicity remains. While once an active area of research, the problem has not only not been solved, it has also been largely abandoned. It is considered too hard or efforts attack only one particular aspect of the problem or more broadly new ideas and approaches have not been brought to bear. This frustration has led to a series of review papers where we summarize the features of broad agreement and provide commentary on those aspects of the problem that were subject to dispute. These are (see also Figure 1): 1. Blood-contacting medical devices: The scope of the problem;2. Protein adsorption phenomena governing blood reactivity;3. Material associated activation of blood cascades and cells;4. Surface modification for hemocompatible materials: passive and active approaches to guide blood-material interactions. We were inspired by the structure of the >1500 year old book of Jewish laws, called the Talmud, in which commentaries are layered on commentaries to interpret and reinterpret a biblical law. It takes the form of a record of discussions pertaining to Jewish law, ethics, philosophy, customs and history. Here we began with what we believed to be a generally accepted truth regarding thrombogenicity and then added our thoughts and commentaries regarding with respect to aspects that were not as scientifically firm as the opening "truth." We hope that future investigators will update these reviews as new scholarship resolves the uncertainties of today. © 2019, The Authors. All rights reserved.

关键词： Cell adhesion

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A Wave Detection Method for Air-Coupled Ultrasound system on Human Abdominal Region

A Wave Detection Method for Air-Coupled Ultrasound System on...

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IEEE International Conference on systems, Man, and Cybernetics

作者： Takahiro Takeda Takuaya Mabuchi Honghai Liu Department of Mechanical System Engineering Daiichi Institute of Technology Kagoshima Japan Graduate School of System Design Tokyo Metropolitan University Japan The State Key Laboratory of Mechanical System and Vibration School of Mechanical Engineering Shanghai Jiao Tong University China

ISBN: (纸本)9781509018987

This paper describes an air-coupled ultrasound system by using DIO-2000. The system is aimed to use for inner muscle evaluation in rehabilitation process. The system evaluates inner muscle with low constrain than conventional method which measured by using MR image, X-ray CT and contacted ultrasound system. Our air-coupled ultrasound system measures transmitted ultrasound wave with very low power through human abdominal region by employing a pulsar-receiver with high sensitive preamplifier, and wave detection method based on fuzzy inference finds transmitted wave from noisy wave. The fuzzy inference is derived from characteristics of transmitted wave. In the experiment, we evaluate the accuracies of wave detection method for human body.

关键词： Aircoupled ultrasound Ultrasound Fuzzy inference Inner muscle

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