18 brainwave® model predictive control for the process industries

... overide control the operators never know which of the loops is controlling the final control element They never know if they are constraining the plant via temp or heater pressure and therefore sometimes ... enters the bottom of the heating tubes and as it heats, steam begins to form Usually there must be a rather high temperature difference between the heating and boiling sides Extensively used for ... Advantages of Model Predictive Control – Automatically compensate for process interaction, measurable load disturbances and constraints using MPC function block – Difficult process dynamics...

Ngày tải lên: 01/10/2013, 13:49

... when the plant modeling error exists, the UMPC maintains the uniformity performance whereas the SMPC does not We formulate the UMPC such that the weighting parameter tuning is related to the uniformity ... shows the receding-horizon control implementation of MPC The control horizon represents the number of parameters used to capture the future control trajectory The predictive horizon represents the ... Although the optimal trajectory of future control signal is completely described within the length of control horizon, the actual control input to the plant only takes the first sample of the control...

Ngày tải lên: 09/09/2015, 11:24

... Chapter Introduction This thesis is concerned with the control of systems under the Model Predictive Control (MPC) framework It focuses on the design of MPC controller for a discrete timeinvariant ... knowledge of open-loop controllers is to measure the current control process state and then compute very rapidly for the open-loop control function The first portion of this function is then used during ... 1|t)} (1.7) The first control of u∗ (t), u∗ (0|t), is then applied to system (1.1) as the control at time t NATIONAL UNIVERSITY OF SINGAPORE SINGAPORE 1.1 Background Therefore, the MPC control law...

Ngày tải lên: 11/09/2015, 14:29

... optimal control studies is the treatment of model uncertainties and the satisfaction of physical constraints Model predictive control (MPC) is one strategy that deals with controller design for systems ... connecting single-mode controllers is provided, therefore various single-mode controllers can be put together under the proposed multimode framework Furthermore, the proposed controller can be determined ... Invariant Sets for PWLBD Systems Disturbance invariant sets play an important role for the controller design for LBD systems The same is true for PWLBD systems They are needed in characterizing the asymptotic...

Ngày tải lên: 11/09/2015, 14:29

... translate to the future, the first part of the control signal, u (k k ) , is sent to the process 2.1.1 The structure of model predictive control The structure of model predictive control consists ... proposed in the TRMS Chapter OVERVIEW OF THE NONLINEAR MODEL PREDICTIVE CONTROL 1.1 Overview of research about nonlinear model predictive control on the world Nonlinear Model Predictive Control (NMPC) ... Nc the control range Second, the future control signals are calculated to optimize the output y of the process sticking to the set trajectory yref when the set signal or the output signal processes...

Ngày tải lên: 21/07/2016, 11:03

Ngày tải lên: 17/03/2014, 18:22

... interactions The FSMB is grateful for the efforts of the members of the Special Committee on Ethics and Professionalism who provided input and direction for this project Model Guidelines for the Appropriate ... on the other end of the electronic medium is truly the patient; likewise, the patient may not be able to verify that a physician is on the other end of the communication For that reason, the standards ... a patient The patient’s face is clearly visible The resident posts the film on YouTube for other first-year residents to see how to properly the procedure These examples highlight the importance...

Ngày tải lên: 24/03/2014, 02:20

... manufacturing industries: the end-product of the food processor is eaten! Production Quality Control The major eifort in quality control is devoted to the production line, and it must be designed around process ... day, or 318 billion meals annually A benchmark study made by the Center for Disease Control analyzed the numbers and causes for food outbreaks across the country for an entire year They found ... basic tools of statistical quality control still work Control charts still supply the information to control the process although now the computer is doing most of the calculations and graph construction...

Ngày tải lên: 02/04/2014, 15:06

... feedback form, i.e., in the form u(n) = μ(x(n)) for some map μ mapping the state x ∈ X into the set U of control values The idea of model predictive control linear or nonlinear—is now to utilize a model ... of model predictive control Regarding terminology, another term which is often used alternatively to model predictive control is receding horizon control While the former expression stresses the ... if the current state is far away from the reference then we want to control the system towards the reference and if the current state is already close to the reference then we want to keep it there...

Ngày tải lên: 11/06/2014, 08:23

... Representation for Explicit Model Predictive Control Chengtao Wen and Xiaoyan Ma 197 Successful Applications of Model Predictive Control 223 Model Predictive Control Strategies for Batch Sugar ... Predictive Control,   and  Chapter 4 presents Model Predictive Control for distributed systems. Model Predictive Control for nonlinear  systems,  multi‐variable  systems  and  other  special  model ... based on prediction and feedback compensation, while there is no special demand on  the form of the system model, the computational tool for online optimization and the form of feedback compensation.  The linear MPC theory is now comparatively mature, so its applications can be found ...

Ngày tải lên: 19/06/2014, 19:20

... SSE denotes the sum of the square error, SSU the sum of the square of the control signal, SSΔU the sum of the square of the change of the control signal and N is the number of samples The values ... Controller 36 Advanced Model Predictive Control 3.2 Control problem decomposition The extension of MPC for the use of nonlinear process models is one of the most interesting research topics These ... academic concept rather than a practicable control technique However, nonlinear model predictive control is gaining popularity in the industrial community The formulations for these controllers vary...

Ngày tải lên: 19/06/2014, 19:20

...  The control sequence output at the k-th control interval in the genetic algorithm is always selected as one of the initial populations at the (k+1)-th control interval Furthermore, some of the ... Computation and Performance Assessment of Nonlinear Model Predictive Control[ J] Proc Of the 41st IEEE Conference on Decision and Control December 2002:4613-4 618 Distributed Model Predictive Control Based ... that these equations have the same structure, they only differ on the weights Therefore, the location of the distributed schemes equilibrium will depend on the selection of αl l = 1, , m There...

Ngày tải lên: 19/06/2014, 19:20

... execute the MPC controllers Only one processor was used to run the centralized MPC controller In the case of the distributed algorithms, the controllers were distributed among the other processors These ... required (s1 or s3 ) for the operation of the HEN, the others are used to expand the operational region of the HEN The inclusion of the control system provides new ways to use the extra utility ... mainly interact between them through the process stream c1 For a HEN not only the dynamic performance of the control system is important but also the cost associated with the resulting operating...

Ngày tải lên: 19/06/2014, 19:20

... N p − 1)   Therefore, for multi-input case the number of the constraints for the change of the control variable ∆u(k) is m×Nu Similarly, the number of the constraints for the control variable ... can be connected to the actual plant for controlling the plant Fig 10 The control system Fig 11 The control system in Simulink 122 Advanced Model Predictive Control Conclusion The paper presents ... fuzzy-neural models The importance of the used in MPC strategy models and their adaptive characteristics is obvious The accuracy of the model determines the accuracy of the control action The proposed...

Ngày tải lên: 19/06/2014, 19:20

... fuzzy-neural model provides the state-space matrices A, B and C (the system is strictly proper, i.e D=0) for the optimization procedure of the model predictive control approach Therefore, the LIQP ... tank of the model The described linearized state-space model is used as an initial model for the training process of the fuzzyneural model during the experiments 4.1 Description of the multi tank ... time The proposed fuzzy-neural identification procedure ensures the matrices for the optimization problem of model predictive control at each sampling time Ts The plant modelling process during the...

Ngày tải lên: 19/06/2014, 19:20

... dynamics Fig Heat exchange process The mathematical Hammerstein model describing the evolution of the exit-temperature of the process water VS the process water flow consists of the following equations ... Nonlinear Model Predictive Control 18 dual-mode NMPC can still yield satisfactory performances, thanks to the capability of the Laguerre series in the inner model The feasibility and superiority of the ... 186 Advanced Model Predictive Control Nonlinear Model Predictive Control 24 ˆ On the other hand, for any e(k) ∈ Se , (49) and (50) yield that e(k + 1) = (Φ + Lffi (·)C)e(k), thus by Lemma 1, for...

Ngày tải lên: 19/06/2014, 19:20

... Representation for Explicit Model Predictive Control 211 15 4.6.3 Preprocessing The preprocessing phase for the lattice representation is composed of two steps The first step is to calculate the eMPC control ... cases, the preprocessing time for building the lattice representations is negligible compared with the time for the eMPC solutions using MPT toolbox Therefore, the LR algorithm is promising for ... representation for explicit model predictive control" , AIChE Annual Meeting, Nashville, TN, November Part Successful Applications of Model Predictive Control 11 Model Predictive Control Strategies for...

Ngày tải lên: 19/06/2014, 19:20

... over time for the 1st control loop 236 Advanced Model Predictive Control Fig Controlled (Supersaturation) and control variables (Ff- feed flowrate) over time for the 2nd control loop Fig Controlled ... are the output and the input weights respectively, which determine the contribution of each of the components of the performance index (1) 4.2 Neural network model predictive control The need for ... controlled processes 4.1 Classical model based predictive control The main difference between MPC configurations is the model used to predict the future behaviour of the process and the optimization...

Ngày tải lên: 19/06/2014, 19:20

... method for estimation are verified So, the next is the performance of the proposed controller in real flight In this section, the performance of the modified GPC (Generalized Predictive Control, ... signals and the resulting process behavior • Selection of model order: The important step in estimating NARX models is to choose the model order The model performance was evaluated by the Means ... compared with the performance of PID controller The parameters of PID controller have been estimated using the internal model based controller The details of the implementation of IMC-PID controller...

Ngày tải lên: 19/06/2014, 19:20

... reducing the dimension of the problem, and ensuring that the controller does not attempt to control weakly controllable directions of the process 317 Model Predictive Control and Optimization for ... are step responses Model Predictive Control and Optimization for Papermaking Processes 315 The process models used for MPC control are often developed in transfer function form, such as: y(s) =g(s)u(s)+d(s) ... points 3.1 Modeling of papermaking MD processes In this section, modelling of the MD process for MPC controller design is discussed The additional modelling required for paper grade change control...

Ngày tải lên: 19/06/2014, 19:20