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Online implementation of wavelet-based identification and dynamic matrix control in a heat exchanger unit

INTERNATIONAL JOURNAL OF AUTOMATION AND control 2010年第3期4卷 317-342页

作者： Mohanta, Hare Krishna Gupta, Ram Krishna BITS Chem Engn Grp Pilani 333031 Rajasthan India ICFAI Inst Sci & Technol Bengaluru 560083 Karnataka India

This paper presents an online implementation of wavelet-based least-square identification (WLSI) and wavelet-based dynamic matrix control (WDMC) in a plate-type heat exchanger unit. Wavelet domain 'blocking' and 'condensing' (B&C) techniques are used to reduce the computation time for optimisation of dynamic matrix control (DMC) performance index. Algorithms for WLSI and WDMC are developed and implemented in the online identification and control of temperature in a heat exchanger unit. The results are compared with conventional PID and DMC controllers. It is observed that the WDMC is better and robust than the other controllers.

关键词： DMC dynamic matrix control WDMC wavelet-based DMC WLSI wavelet-based least-square identification Heat exchanger unit PID control Blocking and Condensing Automation and control

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Implementation of Multiple-Input Multiple-Output dynamic matrix control Algorithm for Fast Processes Using Field Programmable Gate Array

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IFAC-PapersOnLine 2018年第6期51卷 324-329页

作者： Wojtulewicz, Andrzej Lawryczuk, Maciej Institute of Control and Computation Engineering Warsaw University of Technology ul. Nowowiejska 15/19 Warsaw00-665 Poland

The objective of this paper is to describe an implementation of a dynamic matrix control (DMC) algorithm for a Field Programmable Gate Array (FPGA). The DMC algorithm is implemented in a universal version for multiple-input multiple-output dynamic processes. The results of real experiments are presented in which the DE2i-150 development board produced by Terasic with Intel Cyclone IV GX chip is used. As the controlled process a laboratory stand especially developed for this work is used, which is a dynamic system with two manipulated inputs and two controlled outputs. The implemented DMC controller is very fast, it may be used for controlling processed which need sampling periods of a millisecond order. © 2018

关键词： Field programmable gate arrays (FPGA) Codes (symbols) Feedback control Logic gates MIMO systems Model predictive control Storms Telecommunication repeaters controlled process dynamic matrix control dynamic matrix control algorithms dynamic process Fast process Sampling period

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PARAMETER-IDENTIFICATION AND RELATED PROBLEMS FOR THE dynamic matrix control MODEL

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CHEMICAL ENGINEERING COMMUNICATIONS 1991年第1期99卷 103-116页

作者： YIN, K YIN, G ASBJORNSEN, OA WAYNE STATE UNIV DEPT MATHDETROITMI 48202

The parameter identification and related problems for the dynamic matrix control model are studied in this work. A recursive algorithm is employed, and a modified version of it equipped with a useful stopping rule is proposed. The probabilistic approach is taken and the stochastic aspects of the problem is emphasized. It is demonstrated that the algorithm is consistent and possesses certain nice properties. The parameter set reduction problem has also been addressed thoroughly. By using the Kolmogorov-Smirnov statistic, a systematic procedure of hypothesis testing is developed. Various simulation results are demonstrated.

关键词： dynamic matrix control RECURSIVE IDENTIFICATION CONSISTENCY STOPPING RULE HYPOTHESIS TESTING

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Analysis of different control possibilities for the divided wall column:: feedback diagonal and dynamic matrix control

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COMPUTERS & CHEMICAL ENGINEERING 2001年第4-6期25卷 859-866页

作者： Serra, M Perrier, M Espuña, A Puigjaner, L Univ Politecn Cataluna Dept Chem Engn ETSEIB E-08028 Barcelona Spain Ecole Polytech Dept Chem Engn Montreal PQ H3C 3A7 Canada

This work addresses the control of the divided wall column (DWC) as a basic issue to be considered when this kind of distillation arrangement is used to take profit of its potential to reduce energy consumption. Different control structures of diagonal feedback control are compared using multiple input multiple output (MIMO) linear analysis tools in the frequency domain. A controllability analysis of the process is done for the separation of different mixtures and for different operating conditions, including optimal operation. As a result, it is seen that a trade off appears between energy minimisation and controllability. As an alternative, application of dynamic matrix control (BMC) to the DWC is also evaluated. Through simulation, the ability of DMC for disturbance rejection and setpoint tracking is studied and compared with that of the feedback diagonal control. Important limitations of using DMC for the composition control of the DWC are finally highlighted. Q 2001 Elsevier Science Ltd. All rights reserved.

关键词： divided wall column dynamic matrix control multiple input multiple output systems controllability

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dynamic matrix control for the Thermal Power of MHTGR-Based Nuclear Steam Supply System

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ENERGIES 2018年第10期11卷 2651-2651页

作者： Jiang, Di Dong, Zhe Liu, Miao Huang, Xiaojin Tsinghua Univ Collaborat Innovat Ctr Adv Nucl Energy Technol Inst Nucl & New Energy Technol Key Lab Adv Reactor Engn & SafetyMinist Educ Beijing 100084 Peoples R China

The modular high temperature gas-cooled reactor (MHTGR) based nuclear steam supplying system (NSSS) is constituted by an MHTGR, a once-through steam generator (OTSG) and can generate superheated steam for industrial heat or electric power generation. The wide range closed-loop stability is achieved by the recently proposed coordinated control law, in which the neutron flux and the temperatures of both main steam and primary coolant are chosen as controlled variables, and the flowrates of both primary and secondary loop and the control rod speed are chosen as manipulated variables. However, the thermal power is only controlled in open loop manner and hence could be further optimized through feedback. Motivated by this, a dynamic matrix control (DMC) is proposed for optimizing the thermal power of MHTGR based NSSS. A simple step-response model with the thermal power response data is utilized in designing the DMC. The design objective of DMC is to optimize the deviation of the thermal power from its reference under its rate constraint. Then, by the virtue of strong stability of existing control law and optimization ability of DMC, a cascade control structure is implemented for the thermal power optimization, with the coordinated control law in the inner loop and DMC in the outer loop. Numerical simulation results show the satisfactory improvement of thermal power response. This cascade control structure inherits the advantages of both proportional-integral-differential (PID) control and DMC, by which the zeros offset and the short settling time of thermal power are realized.

关键词： nuclear energy optimization dynamic matrix control cascade control modular high temperature gas-cooled reactor (MHTGR)

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dynamic matrix control for thermal power of multi-modular high temperature gas-cooled reactor plants

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ENERGY 2020年 198卷 117386-000页

作者： Jiang, Di Dong, Zhe Tsinghua Univ Inst Nucl & New Energy Technol INET Collaborat Innovat Ctr Adv Nucl Energy Technol Ch Key Lab Adv Reactor Engn & SafetyMinist Educ Beijing 100084 Peoples R China

To suppress the fluctuation from both load side and intermittent renewable energy (IRE), nuclear power plants (NPPS) should be operated in load-following mode to improve economic competitiveness. The modular high temperature gas-cooled reactor (MHTGR) belongs to the category of small nuclear reactor (SMRs) and is suitable for load-following by the virtue of online refueling ability and inherent safety. To realize economies of scale for MHTGR, multi-modular scheme that multiple nuclear steam supply system (NSSS) modules are connected in parallel providing superheated steam for common turbine is recommended to achieve desired power ratings. However, because of the large heat capacity in the pebble-bed of MHTGR and thermal coupling of different NSSSs through common secondary loop fluid network, the current control strategy which suppresses the nuclear power, coolant temperatures measurement from their set-points without considering thermal dynamic of NSSS itself, may not favorable for heat transfer in the NSSS. To improve the load-following ability, a multivariable dynamic matrix control (DMC) is constituted to dynamic compensate the thermal energy variation of NSSS. The implementation of the DMC has a typical cascade structure, where DMC revises the set-points of NSSS module in outer loop and the existing PID control law is adopt for stabilization in inner loop. Numerical results show that this cascade DMC can improve the transient of thermal power under power maneuvering, and can also attenuate the nuclear power, helium flowrate set-points and feed-water temperature step disturbance. (C) 2020 Published by Elsevier Ltd.

关键词： Multi-modular nuclear plant Nuclear steam supply systems Cascade control dynamic matrix control Thermal power optimization Modular high temperature gas-cooled reactor

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dynamic matrix control of a Two Conical Tank Interacting Level System

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Procedia Engineering 2012年 38卷 2601-2610页

作者： V.R. Ravi T. Thyagarajan G. Uma Maheshwaran Department Of Electronics & Instrumentation Engineering Velammal Engineering CollegeChennaiIndia Department Of Instrumentation Engineering M.I.T Campus Anna University Chennai ChennaiIndia

The implementation of control algorithms for MIMO systems is often complicated due to variations in process dynamics that occur because of change in operating point and the characteristics of nonlinear dynamic coupling. Such difficulties often render the performance of industrial decoupling based decentralized PID controllers unsatisfactory. This work develops dynamic matrix controller (DMC) which meets the design specifications for each loop independently for the entire nonlinear operating range. To verify the applicability of the developed DMC, this work presents a Two Conical Tank Interacting Level System (TCTILS) to examine the control performance. Simulation results show that the designed DMC realise a good dynamic behaviour of the TCTILS, a perfect level tracking with no overshoot, lesser settling time, reduced interaction and good rejection of external load disturbances.

关键词： dynamic matrix control Two Conical Tank Interacting Level System Model Predictive control Level control

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Extension of dynamic matrix control to multiple models

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COMPUTERS & CHEMICAL ENGINEERING 2003年第8-9期27卷 1079-1096页

作者： Aufderheide, B Bequette, BW Rensselaer Polytech Inst Howard P Isermann Dept Chem Engn Troy NY 12180 USA

The purpose of the paper is to extend dynamic matrix control (DMC) to handle different operating regimes and to reject parameter disturbances. This is done by two new multiple model predictive control (MMPC) schemes: one based on actual step response tests and the other on a minimal knowledge based first order plus dead time models (FOPDT). Both approaches do not require fundamental modeling. As a benchmark comparison, the two controllers are compared with a nonlinear model predictive controller (NL-MPC) using an extended Kalman filter (EKF) with no initial model/plant mismatch. The application example is the isothermal Van de Vusse reaction, which exhibits challenging input multiplicity. Simulations include disturbances in the feed concentration, kinetic parameters, and additive input and output noise. The two controllers have comparable performance to NL-MPC and in the case of multiple disturbances can outperform NL-MPC. (C) 2003 Elsevier Science Ltd. All rights reserved.

关键词： multiple model predictive control dynamic matrix control extended Kalman filter nonlinear estimation

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Extension of dynamic matrix control to multiple models

Extension of dynamic matrix control to multiple models

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2nd Pan American Workshop on Process Systems Engineering

作者： Aufderheide, B Bequette, BW Rensselaer Polytech Inst Howard P Isermann Dept Chem Engn Troy NY 12180 USA

关键词： multiple model predictive control dynamic matrix control extended Kalman filter nonlinear estimation

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Application of dynamic matrix control Algorithm Based on Real time Operating System

Application of Dynamic Matrix Control Algorithm Based on Rea...

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World Congress on Software Engineering

作者： Wu, Bing Qingdao Univ Sci & Technol Sch Automat & Elect Engn Qingdao 266042 Peoples R China

Combining real time operating system with dynamic matrix control algorithm is a predictive control application. This idea not only realizes real-time control, but has good performances. Simulation data proves out this... 详细信息

ISBN: (纸本)9780769535708

关键词： dynamic matrix control Real time Operating System Algorithm

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