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第36届中国控制会议

作者： Haijuan Zhao Yugang Niu Tinggang Jia Key Laboratory of Advanced Control and Optimization for Chemical Process(East China University of Science and Technology) Ministry of Education Automation Division of Shanghai Electric Group Co. Ltd.

ISBN: (纸本)9781538629185

In this paper,the finite-time boundedness（FTB） problem of sliding mode control（SMC） is investigated for a class of switched delay systems subject to uncertain parameter and nonlinear perturbation.A SMC law is constructed to drive the state trajectories onto the integral sliding surface during a finite time *** FTB of the controlled systems on both reaching phase and siding motion phase are analyzed by means of average dwell time ***,a numerical example is given.

关键词： Switched delay system Finite time boundedness Sliding mode control Average dwell time

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Distillation Sequence optimization Considering Extractive Distillation under Multiple Conditions: A Methanol to Propylene Case Study

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China Petroleum processing & Petrochemical Technology 2019年第4期21卷 88-93页

作者： Yu Jing Qian Feng Wang Jiming Key Laboratory of Advanced Control and Optimization for Chemical Process Ministry of EducationEast China University of Science and TechnologyShanghai 200237 Coteva AgriscienceTM Shanghai 201203 School of Chemical Engineering East China University of Science and TechnologyShanghai 200237

This study provides insights into the distillation sequence optimization of refinery system in a methanol to propylene plant with extractive distillation under multiple conditions. The simulated annealing algorithm(SA) with relative cost function was used to solve a meaningful optimization problem. It was observed that different conditions had differed on the flowsheet. Case study shows the effectiveness of the proposed method.

关键词： distillation sequence optimization simulated annealing algorithm MATLAB multiple conditions

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Development of orange juice freeze drying process

Development of orange juice freeze drying process

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CHISA 2006 - 17th International Congress of Chemical and process Engineering

作者： Koroishi, E.T. Boss, E.A. Maciel Filho, R. State University of Campinas - UNICAMP Laboratory of Optimization Design and Advanced Control - LOPCA Post office box: 6066 13081-970 Campinas Brazil

ISBN: (纸本)8086059456

Freeze drying is a separation process based on sublimation phenomenon, where the solvent is removed as vapor of the frozen substance. The main advantage of this process is to obtain high quality product due to low induction of the thermal degradation. This process allows the retention of the volatilities materials responsible for flavor and may provide a rigid structure of the dried material, which is usually required. Moreover, other advantages of this process are: water low content in the dried product;no need to preserve the product in refrigerated place;reduction of the product weight and volume that facilitates the stockage and transport and increase of the product shelf life. The freeze-drying process can be used in dehydrating of foods (such as coffee, soups and fruits), pharmaceuticals and biotechnological materials. The fundamental stages involved in freeze drying process are: freezing, primary and secondary drying stages. The freezing stage represents the first separation step and the performance of the overall freeze drying process depends significantly of this stage. In the primary freezing stage, the frozen solvent is removed by sublimation. In the secondary drying stage the sublimed water is removed. In this work, the no pasteurized orange juice freeze drying process was considered, and the main objective is to develop a procedure that allows to preserve the flavor and the vitamins of the juice. The vitamin C, or ascorbic acid is one of the most important vitamins found in citric fruit juice such as orange juice. There is variation in the ascorbic acid quantity present in the orange juice due to variety, place where the fruit grows, maturity and fruit extraction method, so that the process should be tailored to couple with such variations. Brazil became the orange first world producer since 80's. The main product extracted from oranges is the juice. In addition to orange juice, various by-products such as essential oils, d'limonene and citrus pulp pell

关键词： Fruit juices

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Fuzzy H∞ Filtering for Nonlinear Networked Systems with Multiple Stochastic Time-Varying Delays, Packet Dropouts and Sensor Saturation 34

Fuzzy H∞ Filtering for Nonlinear Networked Systems with Mul...

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第三十四届中国控制会议

作者： XU Xiaoli YAN Huaicheng ZHANG Hao SHI Hongbo Key Laboratory of Advanced Control and Optimization for Chemical Process of Ministry of Education School of information Science and Engineering East China University of Science and Technology Key Laboratory of Embedded System and Service Computing Ministry of Education

ISBN: (纸本)9781467374439

This paper investigates the problem of H∞ filter design for a class of nonlinear networked system based on T-S fuzzy model. Multiple stochastic time-varying delays and some incomplete information are considered simultaneously. Incomplete information includes randomly occurring sensor saturation and packet dropouts. Stochastic time-varying delays are depicted as a sequence of stochastic and independent variables, which take values on 0 and 1. Two sets of Bernoulli distributed white noises are introduced to describe randomly occurring sensor saturation and packet dropouts. System conservatism is reduced due to introduce an approach of piecewise quadratic Lyapunov function. By solving a set of linear matrix inequalities(LMIs), the filter parameters are obtained. Finally, a simulation example is provided to illustrate the effectiveness of the proposed filter design approach.

关键词： H ∞ filtering,multiple time-varying delays,randomly occurring sensor saturation,packet dropouts,piecewise quadratic Lyapunov function

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Exergy-based performance analysis for biojet fuel pathways in Brazil 32

Exergy-based performance analysis for biojet fuel pathways i...

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32nd International Conference on Efficiency, Cost, optimization, Simulation and Environmental Impact of Energy Systems, ECOS 2019

作者： Silva Ortiz, Pablo A. Filho, Rubens Maciel Osseweijer, Patricia Posada, John School of Chemical Engineering Laboratory of Optimization Design and Advanced Process ControlLOPCA University of Campinas Brazil Faculty of Applied Sciences Department of Biotechnology Delft University of Technology Netherlands

ISBN: (纸本)9788361506515

Increasing efforts in developing sustainable and economically viable technologies to produce transportation fuels have been made in the last decades. Particularly, the aviation industry has conceived that biojet fuels are vital to decrease 50% of the greenhouse gas emissions by 2050 and to achieve carbon-neutral growth by 2020. Thus, the goal of this study is to rank self-sufficient biorefineries for biojet fuel production in Brazil bases on an exergy-based performance analysis aiming to identify the processes irreversibilities. The production capacity assumed for this analysis covers 10% of the projected fuel demand by 2020 in São Paulo (Guarulhos) and Rio de Janeiro (Galeão) airports and considers that the biojet fuel produced is suitable for blending with fossil jet up to 50%. In this context, the base capacity analysed was 210 kton jet/year considering sugarcane (SC) and SC straw as feedstocks, largely available in Brazil. Hence, 24 scenarios were compared for lignocellulosic and lignin valorization processes. These technological pathways covers eight pre-treatment processes such as dilute acid (DA), dilute acid + alkaline treatment (DA-A), steam explosion (SE), steam explosion + alkaline treatment (SE-A), organosolv (O), wet oxidation (WO), liquid hot water (LHW) and liquid hot water + alkaline treatment (LHW-A), followed by enzymatic hydrolysis. Furthermore, three thermochemical processes for the direct conversion of bagasse and lignin upgrade to renewable jet fuel or electricity were considered (Fast pyrolysis, Gasification Fischer-Tropsch and Cogeneration). The exergy assessment evidenced that combined pretreatment processes with the alkaline treatment (DA-A, SE-A, LHW-A) have a better global exergetic performance than the lignocellulosic pre-treatments carried out standalone (DA, SE, O, WO, and LHW). In addition, the use of fast-pyrolysis as a technology for the lignin residues presented the higher performance for all the scenarios. It is shown that the CO2

关键词： Lignin

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process monitoring of multimode processes using kernel independent component analysis

Process monitoring of multimode processes using kernel indep...

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8th International Symposium on advanced control of Chemical processes, ADCHEM 2012

作者： Zhang, Yingwei An, Jiayu Ma, Chi State Key Laboratory of Synthetical Automation of Process Industry Northeastern University Shenyang Liaoning 110819 China Key Laboratory of Advanced Control and Optimization for Chemical Processes Shanghai 200237 China

ISBN: (纸本)9783902823052

In the paper, a new process monitoring approach is proposed for handling the multimode problem in the industrial processes. The original space can be separated into two different parts, which are the common part and the specific part. There are both similarity and dissimilarity in the underlying correlations of different modes, which play different roles in the industrial processes. Because the industrial processes have the non-Gaussian and nonlinear characteristics, modified kernel independent component analysis is used to monitor the multimode processes in this paper. The global multimode basis vector and the multimode sub-basis vector are obtained based on the modified KICA. Then, the common part and specific part in one mode are respectively analyzed. The proposed method is applied to monitor the continuous annealing process. The proposed approach effectively captures the non-Gaussian and nonlinear relationship in different modes in the industrial processes. © 2012 IFAC.

关键词： process monitoring

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Distributed Energy Seheduling of Islanded Microgrid Based on Potential Game

Distributed Energy Seheduling of Islanded Microgrid Based on...

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2020 Chinese Automation Congress, CAC 2020

作者： Chen, Lei Niu, Yugang Jia, Tinggang East China University of Science and Technology The Key Laboratory of Advanced Control and Optimization for Chemical Process Shanghai China Shanghai Electric Automation Group Shanghai200023 China

ISBN: (纸本)9781728176871

Microgrid is an advanced application of distributed renewable energy utilization. With the development of energy Internet technology, microgrid is characterized by strong decentralization and high intelligence. The operation optimization of microgrid requires higher individual autonomy and rational ability, and the traditional centralized optimization is difficult to meet this development trend. In this paper, in order to better reflect the high autonomy of microgrid energy management, a distributed optimization based on potential game is proposed by comprehensively considering multiple independent individuals in the microgrid. Under this strategy, each individual makes decisions with the goal of maximizing their own profits, and completes the iterative solution of the strategy through communication with each other. Finally, a simulation example of islanded microgrid is used to verify the results, which shows that the individual autonomy and intelligence of the microgrid were improved, and the feasibility and effectiveness of the strategy are verified. © 2020 IEEE.

关键词： Energy management

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Sliding Mode Estimation-based control for Stochastic Time Delays in Networked Micorgrid 36

Sliding Mode Estimation-based Control for Stochastic Time De...

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第36届中国控制会议

作者： Xuping Zhou Huaicheng Yan Chen Peng Fuwen Yang Key Laboratory of Advanced Control and Optimization for Chemical Process of Ministry of Education East China University of Science and Technology School of Mechatronic Engineering and Automation Shanghai University School of Engineering Griffith University

ISBN: (纸本)9781538629185

This paper proposes a sliding mode estimation-based control to solve the stochastic time delay problem in networked microgrid,because stochastic delay has a great impact on the stability and performance of large power grids（LPG）.To analyze the delay effects,the microgrid system model is derived according to the characteristics of the inverter in grid-connected *** on the microgrid system model,the stochastic delay estimation with learning parameter and delayed states are *** control signal designed by sliding mode control（SMC） and the learning parameter of delay estimation are adaptively changed in the sliding mode estimation-based control *** reaching law（ERL） is proposed to solve the chattering issues of *** 3.3 KW microgrid parameters are added into simulation to verify the effectiveness and performance of the proposed control strategy.

关键词： Networked Microgrid Sliding Mode control（SMC） Stochastic Delay Estimation

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A Discrete Artificial Bee Colony Algorithm for Minimizing the Total Flow Time in the Blocking Flow Shop Scheduling Problem

A Discrete Artificial Bee Colony Algorithm for Minimizing th...

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第23届过程控制会议

作者： Guanlong Deng Zhenhao Xu Xingsheng Gu Key Laboratory of Advanced Control and Optimization for Chemical Process Ministry of Education Eas Key Laboratory of Advanced Control and Optimization for Chemical Process Ministry of Education Eas

A discrete artificial bee colony algorithm is proposed for solving the blocking flow shop scheduling problem with total flow time criterion. Firstly, the solution in the algorithm is represented as job permutation. Secondly, an initialization scheme based on a variant of the NEH heuristic and a local search is designed to construct the initial population with both quality and diversity. Thirdly, based on the idea of iterated greedy algorithm, some newly designed schemes for employed bee, onlooker bee and scout bee are presented. The performance of the proposed algorithm is tested on the well-known Taillard benchmark set, and computational results demonstrate the effectiveness of the discrete artificial bee colony algorithm. In addition, the best known solutions of the benchmark set are provided for the blocking flow shop scheduling problem with total flow time criterion.

关键词： Flow shop scheduling Blocking Artificial bee colony algorithm Total flow time

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FS-SVDD based on LTSA and its application to chemical process monitoring

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Huagong Xuebao/CIESC Journal 2010年第8期61卷 1894-1900页

作者： Zhang, Shaojie Wang, Zhenlei Qian, Feng Key Laboratory of Advanced Control and Optimization for Chemical Process East China University of Science and Technology Shanghai 200237 China

Dozens of advantages have been reported on using support vector data description (SVDD) in the fields of non-Gaussian process monitoring and fault diagnosis. However, during the SVDD model construction offline, usually the whole training data set is used. Due to the tremendous size of the data set, the computation burden for modeling is quite heavy, which leads to the difficulty in updating model online. Therefore, this paper proposes a fast SVDD algorithm on the basis of the feature samples. In this new algorithm, the feature samples are used in stead of the whole training data set for modeling in order to significantly reduce the computation complexity. Concurrently, PCA is replaced by the local tangent space alignment (LTSA) to extract the underlying manifold structure of the process data set, since the traditional dimension reduction methods, such as PCA, have poor capability to handle nonlinearity. Next SVDD is applied on the manifold. At last, corresponding statistical indices are used for fault detection purpose. The proposed method has been tested on the Tennessee Eastman (TE) process, while the simulation results show the efficiency of it. © All Rights Reserved.

关键词： process monitoring

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