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Documentation Help Center. Economic model predictive controllers optimize control actions to satisfy generic economic or performance cost functions.

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The name Economic MPC derives from applications in which the cost function to minimize is the operating cost of the system under control. Traditional implicit MPC controllers minimize a quadratic performance criterion cost function using a linear prediction model.

economic model predictive control

A quadratic cost function is adequate for tracking specified output and manipulated variable references. However, some applications can require optimizing for performance criteria, such as fuel consumption or production rates. Such performance criteria can be a combination of linear or nonlinear functions of the system states, inputs, or outputs. Uses your generic performance cost function instead of or in addition to the built-in quadratic cost function.

Computes optimal control moves by solving a nonlinear optimization problem using the SQP algorithm in fmincon Optimization Toolbox. State and output functions that define your prediction model. A generic performance-based cost function. For more information on nonlinear MPC controller objects, see nlmpc. At the command line using nlmpcmove.

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Economic MPC Economic model predictive controllers optimize control actions to satisfy generic economic or performance cost functions. An economic MPC controller: Can use a linear or nonlinear prediction model Uses your generic performance cost function instead of or in addition to the built-in quadratic cost function Computes optimal control moves by solving a nonlinear optimization problem using the SQP algorithm in fmincon Optimization Toolbox.

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economic model predictive control

Select web site.Liang, H. September 18, December ; 12 : The paper studies an economic model predictive control EMPC problem for sampled-data linear systems with system constraints.

The cost function consists of an economic part and a regulatory part, and a new EMPC algorithm with piecewise constant control is designed. Iterative feasibility of the designed optimization problem and input-to-state stability ISS of the closed-loop system are proved. In particular, we show that the closed-loop system is input-to-state stable with respect to the supremum norm of the economic cost, and the system state is ultimately bounded within a bound determined by the economic cost. Through thorough simulations, the effectiveness of the designed algorithm is verified and the tradeoff between control and economic performance is demonstrated.

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Economic Model Predictive Control

Author and Article Information. Haojiao Liang. Dec12 : 8 pages. Published Online: September 18, Article history Received:. Views Icon Views. Cite Icon Cite.

Abstract The paper studies an economic model predictive control EMPC problem for sampled-data linear systems with system constraints. Issue Section:. Search ADS. You do not currently have access to this content. View full article. Learn about subscription and purchase options. Product added to cart.

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View Metrics. Accepted Manuscript Alert. New Issue Alert.Objective: Set up and solve the commercial fishing economic optimal control problem. Create a program to optimize and display the results. Estimated Time: 30 minutes. The commercial fishing optimal control problem has an integral profit function that includes the cost of operations and the revenue from fish sales.

The population of fish x is influenced by how many fish are removed each year that depends on u. The objective is to maximize the revenue from fishing over a 10 year time period.

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If there is overfishing high u then the returns for subsequent years are reduced and the fish population does not recover. This optimal control problem finds the optimal extraction profile to maximize the commercial fishing profit. Integrals are a natural expression of many systems where the accumulation of a quantity is maximized or minimized.

The integral is the profit function over the 10 year time period. Integral expressions are reformulated in differential and algebraic form by defining a new variable.

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The new variable J and integral are differentiated and included as an additional equation. The problem then becomes a maximization of the new variable J at the final time. The initial condition of the integral J starts at zero and becomes the integral in the time range of 0 to The end value is maximized at the final point in the time horizon of the optimal control problem.

A maximization problem is converted to a minimization problem by multiplying the objective by negative one. Dynamic Optimization. Syllabus Schedule. Estimated Time: 30 minutes The commercial fishing optimal control problem has an integral profit function that includes the cost of operations and the revenue from fish sales.

Economic Model Predictive Control

Equation x. FV Jf. Equation J. Maximize Jf options m. Options: fixed fluid orange blue green pink cyan red violet. View Edit History Print.These metrics are regularly updated to reflect usage leading up to the last few days. Citations are the number of other articles citing this article, calculated by Crossref and updated daily.

Find more information about Crossref citation counts. The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric. Find more information on the Altmetric Attention Score and how the score is calculated. Wastewater treatment is an integral component in the sustainable development of our society.

Optimal control and operation is critical to the efficiency and economics of a wastewater treatment plant. In this work, we apply economic model predictive control EMPC to a wastewater treatment plant and compare its performance with two commonly used control methods. Specifically, we take advantage of the benchmark simulation model no. A computationally efficient EMPC developed recently is adopted in this work to optimize the effluent quality and operating cost directly.

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The performance of the EMPC is compared with a proportional-integral PI control scheme and a regular tracking model predictive control MPC scheme from different perspectives including effluent quality and operating cost. The simulation results demonstrate that EMPC has the potential to significantly improve effluent quality and reduce operating cost simultaneously compared with PI and MPC schemes. View Author Information. Cite this: Ind.

Article Views Altmetric. Citations Abstract Wastewater treatment is an integral component in the sustainable development of our society. Cited By. This article is cited by 41 publications. Pallavhee, S. Sundaramoorthy, M. Disturbance rejection control for a wastewater treatment process by a learning approach. Measurement and Control35 A hybrid Gaussian process approach to robust economic model predictive control. Journal of Process Control92 Asian Journal of Control22 2 Zone economic model predictive control of a coal-fired boiler-turbine generating system.Later version available View entry history.

We provide basic definitions and concepts of the approach and highlight some promising research directions. Most control tasks involve some kind of economic optimization. In classical linear quadratic LQ control, for example, this is cast as a trade-off between control effort and tracking performance. The designer is allowed to settle such a trade-off by suitably tuning weighting parameters of an otherwise automatic design procedure.

Economic MPC for Obstacle Avoidance in Aerial Robotics Applications

When the primary goal of a control system is profitability rather than tracking performance, a suboptimal approach has often been devised, namely, a hierarchical separation is enforced between the economic optimization layer and the dynamic real-time control layer.

Optimal control or LQ control may be used to achieve the latter task, possibly in conjunction with Model Predictive Control MPCbut the actual economics of the plant are normally neglected at this stage. Reduced computational complexity with respect to infinite-horizon dynamical programming. Stability robustness in the face of uncertainty, normally achieved by using some form of robust control in the real-time control layer.

Economic Model Predictive Control seeks to remove these limitations by directly using the economic revenue in the stage cost and by the formulation of an associated dynamic optimization problem to be solved online in a receding horizon manner. Preserving the original cost has the advantage of slowing down convergence to such an equilibrium when the transient evolution occurs in a region where the stage cost is better than at steady state.

Stability and convergence issues are at first analyzed, thanks to convexity and for the special case of linear systems only. Extending average constraints to the case of Economic MPC with terminal penalty function is possible but outside the scope of this brief tutorial. This leads to an asymptotic performance at least as good as that of the solution adopted as a terminal constraint. This is true under an additional dissipativity assumption which is closely related to the property of optimal operation at steady state.

The next result highlights the connection between dissipativity of the open-loop system and stability of closed-loop Economic MPC. Convergence results are also possible for the case of Economic MPC subject to average constraints.

Economic Model Predictive Control is a fairly recent and active area of research with great potential in those engineering applications where economic profitability is crucial rather than tracking performance. Economic MPC without terminal constraints: removing the need for terminal constraints by taking a sufficiently long control horizon is an interesting possibility offered by standard Tracking MPC.

The basic developments presented in the previous paragraph only deal with systems unaffected by uncertainty. This is a severe limitation of current approaches and it is to be expected that, as for the case of Tracking MPC, a great deal of research in this area could be developed in the future.

In particular, both deterministic and stochastic uncertainties are of interest. Model-Predictive Control in Practice. Optimization Algorithms for Model-Predictive Control. Skip to main content Skip to table of contents. This service is more advanced with JavaScript available. Encyclopedia of Systems and Control Living Edition. Contents Search.

Economic Model Predictive Control. Download entry PDF. How to cite. Introduction Most control tasks involve some kind of economic optimization.

The main benefits of this approach are twofold: 1. The hierarchical approach, however, is suboptimal in two respects: 1. Notice that for converging signals, or even for periodic ones, Av[ y ] always is a singleton but may fail to be such for certain oscillatory regimes.

The main theoretical results in support of the approach discussed in the previous paragraph are discussed below. Three fundamental aspects are treated: Recursive feasibility and constraint satisfaction Asymptotic performance Stability and convergence. Economic Model Predictive Control is not different in this respect, and either one of the following set of assumptions is sufficient to ensure recursive feasibility: 1.The chemical industry is a vital sector of the US economy.

Maintaining optimal chemical process operation is critical to the future success of the US chemical industry on a global market. Traditionally, economic optimization of chemical processes has been addressed in a two-layer hierarchical architecture.

economic model predictive control

In the upper layer, real-time optimization carries out economic process optimization by computing optimal process operation set-points using detailed nonlinear steady-state process models.

These set-points are used by the lower layer feedback control systems to force the process to operate on these set-points. While this paradigm has been successful, we are witnessing an increasing need for dynamic market and demand-driven operations for more efficient process operation, increasing response capability to changing customer demand, and achieving real-time energy management.

To enable next-generation market-driven operation, economic model predictive control EMPCwhich is an model predictive control scheme formulated with a stage cost that represents the process economics, has been proposed to integrate dynamic economic optimization of processes with feedback control.

Motivated by these considerations, novel theory and methods needed for the design of computationally tractable economic model predictive control systems for nonlinear processes are developed in this dissertation. Specifically, the following considerations are addressed: a EMPC structures for nonlinear systems which address: infinite-time and finite-time closed-loop economic performance and time-varying economic considerations such as changing energy pricing; b two-layer hierarchical dynamic economic process optimization and feedback control frameworks that incorporate EMPC with other control strategies allowing for computational efficiency; and c EMPC schemes that account for real-time computation requirements.

The EMPC schemes and methodologies are applied to chemical process applications. The application studies demonstrate the effectiveness of the EMPC schemes to maintain process stability and improve economic performance under dynamic operation as well as to increase efficiency, reliability and profitability of processes, thereby contributing to the vision of Smart Manufacturing.

Skip to main content. Email Facebook Twitter. Abstract The chemical industry is a vital sector of the US economy. Thumbnails Document Outline Attachments. Highlight all Match case. Whole words.

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Email Address. Sign In. In this paper, we use heat pumps for heating residential buildings with a floor heating system. We use the thermal capacity of the building to shift the energy consumption to periods with low electricity prices. In this way the heating system of the house becomes a flexible power consumer in the Smart Grid. This scenario is relevant for systems with a significant share of stochastic energy producers, e.

We present a model for a house with a ground source based heat pump used for supplying thermal energy to a water based floor heating system. The model is a linear state space model and the resulting controller is an Economic MPC formulated as a linear program. The model includes forecasts of both weather and electricity price. Simulation studies demonstrate the capabilities of the proposed model and algorithm.

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