检索结果-内蒙古大学图书馆

Scheduling of a hydro producer considering head-dependency, price scenarios and risk-aversion

ENERGY CONVERSION AND MANAGEMENT 2012年 56卷 96-103页

作者： Pousinho, H. M. I. Mendes, V. M. F. Catalao, J. P. S. Univ Beira Interior Dept Electromech Engn P-6201001 Covilha Portugal Inst Super Engn Lisboa Dept Elect Engn & Automat P-1950062 Lisbon Portugal Univ Tecn Lisboa Ctr Innovat Elect & Energy Engn Inst Super Tecn P-1049001 Lisbon Portugal

In this paper, a mixed-integer quadratic programming approach is proposed for the short-term hydro scheduling problem, considering head-dependency, discontinuous operating regions and discharge ramping constraints. As new contributions to earlier studies, market uncertainty is introduced in the model via price scenarios, and risk aversion is also incorporated by limiting the volatility of the expected profit through the conditional value-at-risk. Our approach has been applied successfully to solve a case Study based on one of the main Portuguese cascaded hydro systems, requiring a negligible computational time. (C) 2011 Elsevier Ltd. All rights reserved.

关键词： Hydro scheduling mixed-integer quadratic programming Head-dependency Price scenarios Risk-aversion

来源：评论

学校读者我要写书评

暂无评论

Energy-Efficient Model Predictive Train Traction Control With Incorporated Traction System Efficiency

引用

IEEE TRANSACTIONS ON INTELLIGENT TRANSPORTATION SYSTEMS 2022年第6期23卷 5044-5055页

作者： Novak, Hrvoje Lesic, Vinko Vasak, Mario Univ Zagreb Fac Elect Engn & Comp Lab Renewable Energy Syst Zagreb 10000 Croatia

The control system for energy-efficient train operation with the inclusion of a detailed train motion model and train traction system energy efficiency is presented in the paper. A piecewise affine train model is constructed with the parameters obtained for the electromotive train of an industrial manufacturer. The model encompasses intrinsic features of the train system such as linearized resistance force, a set of traction and braking force physical limitations and passengers comfort constraints. The resulting quadratic optimization problem is solved parametrically through dynamic programming giving the off-line precomputed optimal control law that is a function of train speed and traversed path. The on-line computed traction force profile is then tuned with respect to the traction system energy efficiency. The developed control system is evaluated on a detailed real case study scenario put together with a railway operator and the train manufacturer. The presented results show the possibility of significant energy consumption reductions achieved by energy-efficient train control.

关键词： Force Resistance Rails Rail transportation Optimization Adhesives Predictive models Energy-efficient train traction control piecewise affine train model explicit model predictive control mixed-integer quadratic programming traction system energy efficiency

来源：评论

学校读者我要写书评

暂无评论

A comparative study of SQP-type algorithms for nonlinear and nonconvex mixed-integer optimization

引用

MATHEMATICAL programming COMPUTATION 2012年第4期4卷 383-412页

作者： Exler, Oliver Lehmann, Thomas Schittkowski, Klaus Univ Bayreuth Dept Comp Sci D-95440 Bayreuth Germany Konrad Zuse Zentrum ZIB D-14195 Berlin Germany

We present numerical results of a comparative study of codes for nonlinear and nonconvex mixed-integer optimization. The underlying algorithms are based on sequential quadratic programming (SQP) with stabilization by trust-regions, linear outer approximations, and branch-and-bound techniques. The mixed-integer quadratic programming subproblems are solved by a branch-and-cut algorithm. Second order information is updated by a quasi-Newton update formula (BFGS) applied to the Lagrange function for continuous, but also for integer variables. We do not require that the model functions can be evaluated at fractional values of the integer variables. Thus, partial derivatives with respect to integer variables are replaced by descent directions obtained from function values at neighboring grid points, and the number of simulations or function evaluations, respectively, is our main performance criterion to measure the efficiency of a code. Numerical results are presented for a set of 100 academic mixed-integer test problems. Since not all of our test examples are convex, we reach the best-known solutions in about 90 % of the test runs, but at least feasible solutions in the other cases. The average number of function evaluations of the new mixed-integer SQP code is between 240 and 500 including those needed for one-or two-sided approximations of partial derivatives or descent directions, respectively. In addition, we present numerical results for a set of 55 test problems with some practical background in petroleum engineering.

关键词： MINLP mixed-integer nonlinear programming SQP Sequential quadratic programming Trust region method Linear outer approximation MIQP mixed-integer quadratic programming Numerical algorithms Performance evaluation mixed-integer test problems Engineering optimization

来源：评论

学校读者我要写书评

暂无评论

Distributed Formation Flight Control of Multirotor Helicopters

引用

JOURNAL OF CONTROL AUTOMATION AND ELECTRICAL SYSTEMS 2017年第4期28卷 502-515页

作者： Viana, Icaro Bezerra dos Santos, Davi Antonio Sandoval Goes, Luiz Carlos Acampora Prado, Igor Afonso Inst Tecnol Aeronaut Dept Flight Mech & Control BR-12228900 Sao Jose Dos Campos Brazil Inst Tecnol Aeronaut Dept Mechatron BR-12228900 Sao Jose Dos Campos Brazil

This paper treats the problem of position formation flight control of a group of three multirotor aerial vehicles under obstacle and collision avoidance constraints. In order to solve the problem, a distributed architecture with model predictive controllers for each vehicle includes a set of convex constraints on the vehicles's position to prevent collisions with other vehicles and obstacles. The resulting distributed scheme controls the formation based on a virtual structure approach where the computers of the architecture exchange position data through diagrams in Simulink. The performance of the method is assessed through simulations considering that the vehicles are subject to disturbance forces and the results show the effectiveness and the ability of the control architecture to handle the obstacle and collision avoidance constraints.

关键词： Unmanned aerial systems Model predictive control mixed-integer quadratic programming Obstacle avoidance Collision avoidance

来源：评论

学校读者我要写书评

暂无评论

Completely positive and copositive program modelling for quadratic optimization problems

引用

OPTIMIZATION 2021年第2期70卷 361-385页

作者： Nguyen, D., V Univ Trier Dept Math Trier Germany

In the present article, we discuss a general concept of lifting a non-convex quadratic optimization problem into a convex program with matrix variables, and then apply it to construct two kinds of equivalent lifted problems, which are completely positive programs (linear programs with completely positive matrix variables) for a class of quadratic optimization problem with linear inequality and mixed binary constraints. The duals of the resulting completely positive programs, which are copositive programs, are constructed. It is shown that, under some conditions, the dual problems are strictly feasible, such that strong duality holds and existing numerical methods for both primal and dual problems can be applied.

关键词： mixed-integer quadratic programming completely positive and copositive programs quadratic multidimensional knapsack problems

来源：评论

学校读者我要写书评

暂无评论

Pricing in non-convex markets with quadratic deliverability costs

引用

ENERGY ECONOMICS 2019年 80卷 123-131页

作者： Kuang, Xiaolong Lamadrid, Alberto J. Zuluaga, Luis F. Amazon Seattle WA 98109 USA Lehigh Univ Dept Ind & Syst Engn Dept Econ 621 Taylor St Bethlehem PA 18015 USA Lehigh Univ Dept Ind & Syst Engn 200 West Packer Ave Bethlehem PA 18015 USA

This article studies the problem of obtaining equilibrium clearing prices for markets with non-convexities when it is relevant to account for convex quadratic deliverability costs and constraints. In a general market, such a situation arises when quadratic commodity or transactions costs are relevant. In the particular case of electricity markets, there is a mix of resources including dispatchable and renewable energy sources, leading to the presence of integer variables and quadratic costs reflecting ramping needs. To illustrate our results, we compute and analyze the equilibrium clearing prices of the Scarfs classical market problem with the addition of ramping costs. (C) 2019 Elsevier B.V. All rights reserved.

关键词： Market-clearing prices quadratic costs Ramping costs Unit commitment mixed-integer quadratic programming Renewable energy sources

来源：评论

学校读者我要写书评

暂无评论

A SIMPLE PLANT-LOCATION MODEL FOR QUANTITY-SETTING FIRMS SUBJECT TO PRICE UNCERTAINTY

引用

EUROPEAN JOURNAL OF OPERATIONAL RESEARCH 1985年第1期21卷 39-46页

作者： HODDER, JE JUCKER, JV Department of Industrial Engineering and Engineering Management Stanford University Stanford California 94305 U.S.A.

The uncapacitated plant location problem under uncertainty is formulated in a mean-variance framework with prices in various markets correlated according to their response to a common random factor. This formulation leads to a mixed-integer quadratic programming problem. However, for a given integer solution, the problem lends itself to a very simple solution procedure. Because of the simplicity of this algorithm, reasonably large problems should be solvable through the use of existing branch-and-bound techniques. Except for the sorting procedure, the computation time increases at most linearly with the size of the nodal subproblem. Dominance holds for the plant location problem addressed here, allowing some relaxation of Jucker and Carlson's (1976) independence assumption.

关键词： Facilities location mixed-integer quadratic programming

来源：评论

学校读者我要写书评

暂无评论

mixed integer programming For Sparse Coding: Application to Image Denoising

引用

IEEE TRANSACTIONS ON COMPUTATIONAL IMAGING 2019年第3期5卷 354-365页

作者： Liu, Yuan Canu, Stephan Honeine, Paul Ruan, Su Normandie Univ INSA Rouen UNIROUEN UNIHAVRELITIS F-76000 Rouen France

Dictionary learning for sparse representations is generally conducted in two alternating steps-sparse coding and dictionary updating. In this paper, a new approach to solve the sparse coding step is proposed. Because this step involves an l(0)-norm, most, if not all, existing solutions only provide a local or approximate solution. Instead, a real l(0) optimization is considered for the sparse coding problem providing a global solution. The proposed method reformulates the optimization problem as a mixed-integer quadratic program (MIQP), allowing then to obtain the global optimal solution by using an off-the-shelf optimization software. Because computing time is the main disadvantage of this approach, two techniques are proposed to improve its computational speed. One is to add suitable constraints and the other to use an appropriate initialization. The results obtained on an image denoising task demonstrate the feasibility of the MIQP approach for processing real images while achieving good performance compared to the most advanced methods.

关键词： mixed-integer quadratic programming sparse representation sparse coding dictionary learning image denoising K-SVD

来源：评论

学校读者我要写书评

暂无评论

COMPENSATION OF VALVE DEADZONE USING mixed integer PREDICTIVE CONTROL 31

COMPENSATION OF VALVE DEADZONE USING MIXED INTEGER PREDICTIV...

引用

31st European Conference on Modelling and Simulation, ECMS 2017

作者： Novak, Jakub Chalupa, Petr Tomas Bata Univ Fac Appl Informat Ctr Secur Informat & Adv Technol Nam TGM 5555 Zlin 76001 Czech Republic

ISBN: (纸本)9780993244049

Stiction is a nonlinear friction phenomenon that causes poor performance of control loops in the process industries. In this work, we develop a mixed-integer MPC (Model Predictive Control) formulation including valve dynamics for a sticky valve in order to improve control loop performance. The introduction of the valve nonlinearity into the model prevents the MPC from requesting physically unrealistic control actions due to valve stiction. Simulation studies using a two-tank systems show that, if the deadband value is known a priori, the mixed-integer quadratic programming (MIQP) can effectively improve the closed-loop performance in the presence of valve stiction.

关键词： Predictive control mixed-integer quadratic programming Valve deadzone Hybrid system

来源：评论

学校读者我要写书评

暂无评论

Comparison between Optimal Control Allocation with mixed quadratic & Linear programming Techniques

Comparison between Optimal Control Allocation with Mixed Qua...

引用

10th IFAC Conference on Control Applications in Marine Systems (CAMS)

作者： Grechi, Simone Caiti, Andrea Univ Pisa Dept Informat Engn Pisa Italy Univ Pisa Ctr E Piaggio Pisa Italy Interuniv Ctr Integrated Syst Marine Environm ISM Genoa Italy

The paper provides a comparison between different control allocation techniques in over-actuated Autonomous Underwater Vehicles. The pseudoinverse, Linear programming (LP), quadratic programming (QP), mixed integer Linear programming (MILP) and mixed integer quadratic programming (MIQP) are evaluated in simulation on the V-Fides vehicle model. The MILP and MIQP techniques allow to include in their implementations a more detailed characterization of the non-linear static behaviour of the actuators. This customizability can be also exploited to improve the practical stability of the system. The metrics used for comparison include the maximum attainable forces and torques, the integral of the error allocation and the required thrusters effort. Our simulation results show that, in particular with respect to thrusters effort, MILP and MIQP are the preferred allocation methods. The computational complexity associated to both methods is not such to compromise their implementation in operating vehicles;in particular, the MILP version is currently implemented in the V-Fides vehicle. (C) 2016, IFAC (International Federation of Automatic Control) Hosting by Elsevier Ltd. All rights reserved.

关键词： Optimal Control allocation quadratic programming Linear programming mixed-integer Linear programming mixed-integer quadratic programming

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：