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31st Chinese Control And Decision Conference (CCDC)

作者： Huang, Qingnan Wang, Cun Dai, Xisheng Guangxi Univ Sci & Technol Sch Elect & Informat Engn Liuzhou 545006 Peoples R China Guangxi Higher Educ Inst Key Lab Ind Proc Intelligent Control Technol Liuzhou 545006 Peoples R China

ISBN: (纸本)9781728101057

In this paper, we study the consensus tracking for a class of distributed parameter models multi-agent systems. Taking into account the presence of disturbance in the system, using knowledge between neighboring agents, the virtual leader technology is introduced. A distributed P-type iterative learning control protocol is proposed. When the ILC law is applied to the system, the consensus tracking error between any two agents under the sense of L-2 norm can converge to zero after a sufficient number of iterations in a finite time interval. Finally, simulation examples demonstrate the effectiveness of the method.

关键词： Iterative learning control distributed parameter model multi-agent systems disturbance consensus tracking

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Toward an Optimum Design of an Amorphous Silicon Photovoltaic/Thermal System:Simulation and Experiments

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Journal of Thermal Science 2023年第3期32卷 947-964页

作者： REN Xiao LI Jing LIU Weixin ZHU Chuanyong PEI Gang GONG Liang College of New Energy China University of Petroleum(East China)Qingdao 266580China Research Center for Sustainable Energy Technologies Energy and Environment InstituteUniversity of HullHU67RXUK Department of Thermal Science and Energy Engineering University of Science and Technology of ChinaHefei 230026China

Amorphous silicon photovoltaic/thermal(a-Si-PV/T)technology is promising due to the low power temperature coefficient,thin-film property,thermal annealing effect of the solar cells,and high conversion efficiency in *** design of a-Si-PV/T system is influenced by a number of thermodynamic,structural,and external *** analysis is useful for a good design of the system.A dynamic distributed parameter model is built and verified in this *** tests are carried *** impacts of operating temperature,mass flow rate,cover ratio of solar cells,heat transfer area,and frame shadow ratio on its performance are theoretically and experimentally *** results indicate that seven or eight copper tubes are suitable to achieve a high overall efficiency of the a-Si-PV/T *** frame and tilt angle shall avoid a shadow ratio of more than 8.3%during *** difference between power outputs at operating temperatures of 35℃and55℃in the first month is about 0.21%while it drops to less than 0.1%in the twelfth *** with conventional PVT systems,the a-Si-PV/T system benefits from a higher design temperature with a minor efficiency decrement.

关键词： amorphous silicon cell photovoltaic thermal system parametric analysis distributed parameter model frame shadow

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Improved genetic algorithm-based prediction of a CO2 micro-channel gas-cooler against experimental data in automobile air conditioning system

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INTERNATIONAL JOURNAL OF REFRIGERATION-REVUE INTERNATIONALE DU FROID 2019年 106卷 517-525页

作者： Yang, Jingye Yu, Binbin Chen, Jiangping Shanghai Jiao Tong Univ Inst Refrigerat & Cryogen Shanghai 200240 Peoples R China

For the prevailing CO2 micro-channel gas-cooler (MCGC) mathematical modeling research, a big challenge for an efficient numerical model is the trade-off between fast calculation and high-precision considering the specific properties of CO2. The main purpose of this work is to propose a regression method with multiple variables for CO2 MCGC model based on the combination of distributed parameter model (DPM) and Genetic algorithm (GA). The GA based prediction model of MCGC is established, which takes correlation coefficients and mean squared error into consideration. A test rig of CO2 MCGC is developed, and the experimental data used to validate the MCGC model are collected. The fixed-point iteration algorithm is utilized to reduce the complexity of simulation to accelerate the iteration speed. Moreover, an improved Taylor series expansion-based method for fast calculation of working fluid properties was proposed. The model precision was analyzed by comparing the prediction results with conducted experimental data. The improved CO2-to-air MCGC model enables to predict refrigerant outlet temperature and pressure drop within a maximum deviation of 1.2 degrees C and 2 kPa against the experimental data. (C) 2019 Elsevier Ltd and IIR. All rights reserved.

关键词： CO2 Micro channel gas cooler distributed parameter model Genetic algorithm Interpolation method Heat transfer performance

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Thermal performance analysis of SuperORV heat transfer tube at supercritical pressure

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JOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING 2016年 29卷 488-496页

作者： Pan, Jie Li, Ran Lv, Tao Wu, Gang Xian Shiyou Univ Coll Petr Engn Xian 710065 Shaanxi Provinc Peoples R China

Super open rack vaporizer (SuperORV) is a new-type of liquefied natural gas (LNG) vaporizer whose lower half of heat transfer tubes has double tube structure. A distributed parameter model based on energy balance is developed in the present paper with the aim to simulate the thermal performance of SuperORV heat transfer tube at supercritical pressure. Corresponding empirical correlations are used to evaluate the convection heat transfer of LNG and seawater, and the heat transfer enhancement effects of inner fin and twisted tape insert are considered in computation. Good agreement between calculated and experimental data implies the calculation model is reliable. On this basis, the temperature and ice thickness profiles along the heat transfer tube are obtained by numerical solution with or without ice layer presence, the thermal performance of heat transfer tube is analyzed, and the effects of operating parameters and heat transfer enhancement techniques on the thermal performance are discussed. The results indicate that both the operating parameters and the heat transfer enhancement techniques have great influence on the thermal performance, including required minimum tube length, ice thickness and length of formed ice layer. The heat transfer enhancement techniques can improve the heat transfer performance markedly, and the required tube length is reduced by 47.7% while both inner fin and twisted tape insert are applied. (C) 2016 Elsevier B.V. All rights reserved.

关键词： LNG SuperORV Heat transfer tube distributed parameter model Thermal performance Supercritical pressure

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A partial differential equation model predictive control strategy:: application to autoclave composite processing

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COMPUTERS & CHEMICAL ENGINEERING 2004年第4期28卷 545-556页

作者： Dufour, P Michaud, DJ Touré, Y Dhurjati, PS Univ Lyon 1 LAGEP UMR 5007 CNRS F-69622 Villeurbanne France Univ Delaware Dept Chem Engn Newark DE 19716 USA Univ Orleans LVR UPRES EA 2078 F-18020 Bourges France

A general framework for a partial differential equation (PDE) model predictive control (MPC) problem is formulated. A first principle model of the system. described by a semi-linear PDE system with boundary control, is employed in a model predictive control (MPC) framework. Here, the aim is to determine, off-line (i.e. without process measurement), the theoretical optimal behavior of the process that will be used during on-line MPC. Input and output constraints are handled in the optimization task using a nonlinear programming method. This strategy is evaluated for the optimization of processing temperatures during the manufacture of thick-sectioned polymer composite laminates. The off-line optimization task consists of determining the optimal temperature profile, otherwise known as the cure cycle. Moreover, for this particular process, the existence of a feasible constrained optimization problem is discussed through the design of a constraint bound. (C) 2003 Elsevier Ltd. All rights reserved.

关键词： model predictive control distributed parameter model nonlinear programming trajectory optimization composite manufacturing autoclave curing process

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Current differential protection principle of HVDC transmission system

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IET GENERATION TRANSMISSION & DISTRIBUTION 2017年第5期11卷 1286-1292页

作者： Gao, Shu-ping Liu, Qi Song, Guo-bing Xian Univ Sci & Technol Coll Elect & Control Xian 710054 Shaanxi Peoples R China Xi An Jiao Tong Univ Coll Elect Engn Xian 710049 Shaanxi Peoples R China Shaanxi Elect Power Design Inst Co Ltd China Energy Engn Grp Xian 710054 Shaanxi Peoples R China

Traditional high-voltage DC (HVDC) current differential protection has problems on identifying fault current and has long delay. In this study, a novel current differential protection principle for HVDC transmission lines is proposed. By the adoption of distributed parameter model, differential current criterion is formed at a selected point on the transmission line. When fault occurs on DC line, setting point differential current reaches a high value. When no fault occurs or fault occurs outside the DC line, setting point differential current reaches a small value. Comparing with the traditional current differential protection, the proposed principle eliminates the impact of distributed capacitive current and has no requirement of delay. Comparing with travelling wave protection, fault identification can be performed during both transient and steady states, and the proposed method has reasonable sampling frequency requirements and has high reliability. Simulation analysis shows that the proposed principle identifies faults reliably and rapidly. The proposed principle is theoretically novel and practically applicable.

关键词： HVDC power transmission power transmission protection power transmission lines current differential protection HVDC transmission system HVDC transmission lines distributed parameter model distributed capacitive current travelling wave protection fault identification

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A Novel Fault-Location Method for HVDC Transmission Lines

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IEEE TRANSACTIONS ON POWER DELIVERY 2010年第2期25卷 1203-1209页

作者： Suonan, Jiale Gao, Shuping Song, Guobing Jiao, Zaibin Kang, Xiaoning Xi An Jiao Tong Univ Dept Elect Engn Xian 710049 Shanxi Peoples R China

This paper presents a method for locating faults on HVDC transmission lines using two terminal data. Different from those based on the traveling wave principle, the new fault-location algorithm can use any section of the postfault data to locate faults. The proposed method is developed based on the distributed parameter line model in which the voltage distribution over the line can be obtained from the voltage and current measurements at both terminals and point where fault occurs can be identified from the calculated voltage distribution. The fault-location algorithm is performed in time domain and thus a short data window is sufficient for it to achieve satisfactory accuracy in practice. The proposed algorithm is simulated using data of the frequency-dependent line model in EMTDC and data of an existing HVDC line as well. The simulations have shown that this method is valid and is capable of locating the faults occurring on HVDC transmission lines quickly and accurately.

关键词： distributed parameter model fault location HVDC transmission line relay protection two-terminal electrical measurements

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Regenerative Effects of Orthogonal Chip Dimensions on Turning Stability of Thin-Wall Workpiece-Tool Coupled Dynamics

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IEEE-ASME TRANSACTIONS ON MECHATRONICS 2022年第5期27卷 3601-3612页

作者： Guo, Jiajie Lee, Kok-Meng Yu, Man Ma, Haifeng Xiong, Zhenhua Huazhong Univ Sci & Technol State Key Lab Digital Mfg Equipment & Technol Wuhan 430074 Peoples R China Huazhong Univ Sci & Technol Sch Mech Sci & Engn Wuhan 430074 Peoples R China Georgia Inst Technol Woodruff Sch Mech Engn Atlanta GA 30332 USA Shanghai Jiao Tong Univ Sch Mech Engn State Key Lab Mech Syst & Vibrat Shanghai 200240 Peoples R China

Machining stability of thin-wall (flexible) components plays an important role in manufacturing efficiency and final product qualities, where machining dynamics are characterized by infinite degrees of freedom distributed in both the time and spatial domains. This article presents a distributed parameter method to model the coupled workpiece-cutting tool (WP-CT) dynamics and investigate the regenerative effects of both depth and width of cut on turning stability. By accounting for the regenerative effects in both radial and axial directions of a flexible disk component, this method relaxes a commonly made assumption that the regenerative chip of the coupled WP/CT dynamics varies in the direction of chip thickness. Formulated using the energy method, the dynamic model that requires only a few dominant modes is developed to construct 3-D stability lobe diagrams in terms of width/depth of cut, rotational speed, and cutting position. The proposed modeling method, which offers a means to identify parameters of a coupled WP-CT system and predict the spatially distributed vibrations and their effects on machining stability, has been analyzed in simulation and validated with experiments.

关键词： distributed parameter model flexible workpiece (WP) machining dynamics stability lobe diagram thin-wall component

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New Approach for Precisely Measuring the Zero-Sequence parameters of Long-Distance Double-Circuit Transmission Lines

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IEEE TRANSACTIONS ON POWER DELIVERY 2016年第4期31卷 1627-1635页

作者： Hu, Zhijian Xiong, Min Li, Chuanqi Tang, Peng Wuhan Univ Sch Elect Engn Wuhan 430072 Hubei Peoples R China State Grid Tianjin Power Maintenance Co Tianjin 300010 Peoples R China State Grid Nanchang Elect Power Supply Co Nanchang 330000 Peoples R China

Based on transmission-line equations and the distributed parameter model, a new approach is proposed to accurately measure the zero-sequence parameters of long-distance double-circuit transmission lines using voltages and currents measured at the ends of lines. The mathematical model of the proposed method is explained in detail, and the differential equations of two coupled lines with different self parameters were solved for the first time with Laplace transform to obtain all of the zero-sequence parameters. And this approach is easy to implement since the measurement process is simple. PSCAD simulation experimental results of double-circuit 500 kV transmission lines with line lengths changing from 200 to 1000 km and a comparison of the measurement results between the proposed method and the traditional method are shown. Simulation experiments validate that whether the two lines are short or long, the new approach has high accuracy even if there is system white noise and interference from other coupled lines.

关键词： distributed parameter model Laplace transform long-distance double-circuit transmission lines parameter measurement transmission-line equations zero-sequence parameters

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Role of pH in partitioning and cation exchange of aromatic amines on water-saturated soils

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CHEMOSPHERE 2001年第4期44卷 627-635页

作者： Li, H Lee, LS Fabrega, JR Jafvert, CT Purdue Univ Dept Agron W Lafayette IN 47907 USA Purdue Univ Sch Civil Engn W Lafayette IN 47907 USA

Predicting the reversible interactions between aromatic amines and soil is essential for assessing the mobility, bioavailability and exposure from contaminated sites. Reversible sorption mechanisms of aniline and alpha -naphthylamine were investigated by using single and binary solute sorption to five soils at several pH values, and by applying a distributed parameter (DP) model. The DP model assumes linear partitioning of the neutral species into soil organic matter domains and organic cation binding on negative-charged sites with the exchange coefficients represented by a Gaussian probability distribution. Sorption nonlinearity was attributed to cation exchange with varying site affinities, which was adequately simulated using the DP model. Greater uptake by hydrophobic partitioning and selectivity for cation exchange sites was observed for alpha -naphthylamine compared to aniline. Sorption of alpha -naphthylamine was not impacted quantitatively by aniline under those conditions examined;however, aniline sorption was reduced by alpha -naphthylamine with the largest reduction occurring in the soil with the lowest pH. DP model simulations showed that although hydrophobic partitioning increases with soil-solution pH, cation exchange still contributes significantly to the total sorption even at soil-solution pH values greater than pK(a) + 2. (C) 2001 Elsevier Science Ltd. All rights reserved.

关键词： competitive sorption speciation aromatic amine distributed parameter model cation exchange partitioning

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