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检索条件"主题词=Mixed integer linear programming"

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Task Rescheduling Model for Resource Disruption Problem in Unrelated Parallel Processor System

Task Rescheduling Model for Resource Disruption Problem in U...

引用

21st National Symposium on Mathematical Sciences (SKSM)

作者： Nordin, Syarifah Zyurina Caccetta, Lou Univ Teknol Malaysia Fac Sci Dept Math Sci Utm Johor Bahru 81310 Johor Malaysia Western Australian Ctr Excellence Ind Optimizat Curtin Univ Dept Math & Stat Perth WA 6845 Australia

ISBN: (纸本)9780735412415

In this paper, we concentrate on the scheduling problem with interruption occurs in the parallel processor system. The situation happens when the availability of the unrelated parallel processors in the time slot decreases in certain time periods and its define as resource disruption. Our objective is to consider a recovery scheduling option for this issue to overcome the possibilities of having infeasibility of the original scheduling plan. Our approach for the recovery is task rescheduling which is to assign the tasks in the initial schedule plan to reflect the new restrictions. A recovery mixed integer linear programming model is proposed to solve the disruption problem. We also conduct a computational experiment using CPLEX 12.1 solver in AIMMS 3.10 software to analyze the performance of the model.

关键词： rescheduling parallel processor system mixed integer linear programming

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Optimum Discrete Max-Min Style Broadcast Beamforming Design

Optimum Discrete Max-Min Style Broadcast Beamforming Design

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22nd IEEE Signal Processing and Communications Applications Conference (SIU)

作者： Demir, Ozlem Tugfe Tuncer, T. Engin Orta Dogu Tekn Univ Elekt & Elekt Muhendisligi Bolumu Ankara Turkey

ISBN: (纸本)9781479948741

In this paper, max-mm style transmit beamformer design for single group multicast (broadcast) scenario is considered. The phase and amplitude values of beamformer vector coefficients are selected from finite discrete sets. With the help of integer variables, original optimization problem is converted to a linear form appropriate for mixed integer linear programming. The solution is always feasible as long as the total power is above a certain value. Branch and cut strategy guarantees the optimum solution. Proposed approach is very effective and with moderate number of bits, a performance closed to optimum continuous beamformer can be obtained.

关键词： transmit beamformer max-mm style beamformer discrete beamformer mixed integer linear programming

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Multifunctional Operation of a Virtual Power Plant in an Active Distribution Grid: Modelling Approaches and First Field Test Experiences from the SmartRegion Pellworm Project

Multifunctional Operation of a Virtual Power Plant in an Act...

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5th IEEE PES Innovative Smart Grid Technologies Conference Europe (ISGT Europe)

作者： Koopmann, Simon Nicolai, Steffen Schnettler, Armin Rhein Westfal TH Aachen Inst High Voltage Technol Aachen Germany Fraunhofer IOSB Adv Syst Technol AST Branch Ilmenau Germany

ISBN: (纸本)9781479977208

In the project SmartRegion Pellworm, a virtual power plant (VPP) consisting of renewable power plants, battery storage systems and electric storage heaters on household level is simulated, analyzed and demonstrated in real operation. This paper presents the modelling approach developed in the project to simulate and evaluate a VPP pursuing different operation strategies. These include a market driven, a grid supportive, a local supply oriented and a multifunctional strategy. A key component of the modelling approach is a mixed integer linear programming model for the optimization of VPP operation planning. The simulation results for the real test case on the German island Pellworm show that multifunctional operation is a promising solution to serve multiple stakeholders. However, market driven operation proves to be most profitable in the given market framework. First insights from the field test show how the simulated operation strategies are transferred to an energy management system for online VPP operation.

关键词： Virtual power plants energy storage flexible loads mixed integer linear programming energy management system field test demonstration

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LUOPAN: Light Utility-Oriented Placement of Actuator Nodes in Sensor/Actuator Networks

LUOPAN: Light Utility-Oriented Placement of Actuator Nodes i...

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IEEE International Symposium on Circuits and Systems (ISCAS)

作者： Lei, Chi-Un Univ Hong Kong Dept Elect & Elect Engn Hong Kong Hong Kong Peoples R China

ISBN: (纸本)9781479934324

We develop a light utility-oriented placement of actuator nodes (LUOPAN) for wireless sensor/actuator networks (WSAN) to spread serving duties among actuator nodes (ANs). Through appropriate placement of ANs and allocation of serving duties, system deployment cost can be reduced, and the system longevity can be improved. By considering utility consumption and geographic distribution of required services, LUOPAN outperforms existing strategies (e.g. area coverage approach and greedy approach) in terms of operation efficiency and setup cost. A mixed integer linear programming is used to obtain an optimal solution in a discretized search space, with considerations of service fading and multi-scenario placements.

关键词： Accuracy Actuators Ad hoc networks Fading Optimization Wireless communication Wireless sensor networks actuators fading color CARRIER SYSTEM Ad hoc networks Wireless sensor networks mixed integer linear programming placement operating efficiency Ganglia greedy method

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Simplified representation of a large transmission network for use in long-term expansion planning

Simplified representation of a large transmission network fo...

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2014 Power Systems Computation Conference (PSCC)

作者： Fezeu, Claude-Alexandra Bell, Keith Ding, Jiansong Panciatici, Patrick Debry, Marie-Sophie Reseau Transport Elect Paris France Univ Strathclyde Glasgow G1 1XQ Lanark Scotland

ISBN: (纸本)9788393580132

This paper concerns the development of a new approach to the simplification of representation of the spatial dimension of a large transmission network in order that the influences on bulk power transfers can be assessed in a practical way and the main routes that should be reinforced readily identified. The main challenge is to achieve a satisfactory clustering to deliver a number of zones that is small enough to make subsequent analysis of the expansion panning problem manageable but not so small as to neglect key regions of the original system. Two particular methods that have previously been proposed are described: a K-means algorithm and Dodu's mixed integer linear programming based approach. Each of them has some disadvantages, in particular that a direct interface between two zones might be derived that has no equivalent on the real network;or that it is difficult to control the number of zones. Hence, this paper describes a new hybrid method that ensures that resulting zonal delineations make engineering sense from the point of view of physical connections and allow some control over the number of zones. Results are presented in respect of the transmission network in Great Britain. Applications of the simplified network are discussed, not only in long-term planning but also in respect of the potential for use in transmission charging.

关键词： transmission planning electrical distance mixed integer linear programming K-means clustering

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European Power Exchange day-ahead market clearing with Benders Decomposition

European Power Exchange day-ahead market clearing with Bende...

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2014 Power Systems Computation Conference (PSCC)

作者： Dourbois, Grigoris A. Biskas, Pandelis N. Aristotle Univ Thessaloniki Dept Elect & Comp Engn Thessaloniki 54124 Greece

ISBN: (纸本)9788393580132

A European Power Exchange day-ahead market with both simple and combinatorial products is modeled in this paper and cleared using Benders Decomposition. Except from simple hourly supply offers and demand bids, the products comprise supply and demand profile block offers/bids, and supply and demand linked profile block offers/bids. The problem constitutes a mixed integer linear programming model having a decomposable structure, which is decomposed in terms of binary and continuous variables, and solved using the Benders Decomposition approach. The master problem includes the binary variables, the decisions of which are transferred to the sub-problem, which incorporates the problem continuous variables. The iterations of Benders method constitute inner iterations;outer iterations are also performed in order to handle the paradoxically accepted and rejected blocks. The overall algorithm converges to the solution of the original MILP problem. The proposed approach is evaluated using the IEEE RTS-96 three-area test system.

关键词： Power Exchange day-ahead electricity market clearing mixed integer linear programming Benders Decomposition Paradoxically accepted/rejected blocks

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Controlling Multiple Batteries on a Radial Line 24

Controlling Multiple Batteries on a Radial Line

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Australasian Universities Power Engineering Conference (AUPEC)

作者： Nekouei, Ehsan Alpcan, Tansu Brandao, Miguel Univ Melbourne GE Energy Melbourne Vic 3010 Australia Univ Melbourne Dept Elect & Elect Engn Melbourne Vic 3010 Australia

ISBN: (纸本)9780646923758

This paper studies the problem of optimizing the performance of multiple batteries located in a radial distribution line under the network constraints. A centralized controlling unit minimizes the charge/discharge costs of the batteries by coordinating the operation modes of the batteries on the line as well as their current input/output. The considered optimization problem is formulated as a mixed-integer-linear-program (MILP) in which the batteries' currents are limited by voltage drop constraints, current rating constraints, battery capacity constraints and charge/discharge coordination constraints. The latter constraint is proposed to ensure that all batteries simultaneously operate in only one of the operation modes, i.e. charge or discharge, to avoid the undesirable situation wherein a subset of the batteries charge the rest of batteries. Our numerical results show that the proposed MILP effectively manages the operation of the batteries while satisfying the distribution network constraints.

关键词： Battery coordination Distribution constraints mixed integer linear programming

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Joint Transmission Expansion Planning and Energy Storage Placement in Smart Grid Towards Efficient Integration of Renewable Energy

Joint Transmission Expansion Planning and Energy Storage Pla...

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IEEE PES T and D Conference and Exposition

作者： Hedayati, Mojgan Zhang, Junshan Hedman, Kory W. Arizona State Univ Sch Elect Comp & Energy Engn Tempe AZ 85287 USA

ISBN: (纸本)9781479936564

This paper investigates the integration of renewable energy resources in power systems, using bulk energy storage technologies as well as transmission system capacity expansion. A joint transmission expansion planning and energy storage placement is proposed to satisfy the requirements of a power system model with wind farm generation. The problem is formulated as a multistage mixed integer programming problem, aiming to minimize the total investment and operational costs incurred for integrating wind generation. The operating cost captures the benefits subject to the planning decisions. Based on the DC power flow model, the optimal planning is presented, which strikes a balance between the system expansion cost and the operational cost. By leveraging the properties of the proposed optimization problem, the formulated problem is transformed into a linear mixed integer program. Numerical studies, using the modified Roy Billinton Test System (RBTS) and IEEE Reliability Test System (RTS), explore the proposed optimization method and compare the central and distributed energy storage schemes. The results demonstrate the significant benefits of the proposed approach.

关键词： Storage unit placement transmission expansion planning mixed integer linear programming energy storage modeling

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mixed-integer optimisation based approach for design and operation of distributed energy systems 24

Mixed-integer optimisation based approach for design and ope...

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Australasian Universities Power Engineering Conference (AUPEC)

作者： Wouters, Carmen Fraga, Eric S. James, Adrian M. Polykarpou, Eleftheria M. Univ Coll London Sch Energy & Resources Adelaide SA Australia Univ Coll London Dept Chem Engn Ctr Proc Syst Engn Adelaide SA Australia

ISBN: (纸本)9780646923758

This paper presents an optimisation based approach for the design and operation of residential distributed energy systems. The mathematical model minimises the total annualised cost of the system to meet its total energy demand, selecting from a pool of distributed energy generation, supply and storage alternatives as well as microgrid (MG) operation and a heating pipeline network. Technical and financial characteristics of the technologies and area-specific climatological and tariff structures are integrated in the model which is implemented in GAMS. The focus is to identify the optimal energy system design of a residential neighbourhood coupled with optimal operation of the selected technologies under given demand profiles. Selected system design scenarios are researched to determine the impact of photovoltaic (PV) units as one of several technology alternatives and energy tariffs on residential distributed energy system design. Two similar residential neighbourhoods based in Athens (Greece) and Adelaide (Australia) are compared.

关键词： combined heat and power distributed generation energy integration microgrid mixed integer linear programming

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Switching Sequence Modelling for Network Reconfiguration 6

Switching Sequence Modelling for Network Reconfiguration

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IEEE PES Asia-Pacific Power and Energy Engineering Conference (IEEE PES APPEEC)

作者： Tian, Shijun Wang, Xifan Xiao, Yunpeng Xi An Jiao Tong Univ Sch Elect Engn Xian Peoples R China

ISBN: (纸本)9781479975372

Transmission switching as a powerful tool is utilized to change network topology during operations which, in turn, would lead to higher economic benefits of a power system. However, network reconfiguration includes a chain of time sequencing switching actions which can bring disturbances into systems. This paper proposes a model addresses the process of transmission switching. The objective is to minimize the time of network reconfiguration via appropriate arrangements of the switching sequences, switching time intervals and corresponding generation outputs under system operating limits and security constraints conditions. The proposed model is demonstrated on the IEEE 118-bus test system. Computational results show the importance and necessity of proper arrangements of switching sequence.

关键词： mixed integer linear programming network reconfiguration transmission switching

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