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Optimal sizing of renewables and battery systems for hybrid AC/DC microgrids based on variability management

APPLIED ENERGY 2022年 321卷

作者： Xie, Peng Jia, Youwei Lyu, Cheng Wang, Han Shi, Mengge Chen, Hongkun Southern Univ Sci & Technol Dept Elect & Elect Engn Shenzhen Peoples R China Hong Kong Polytech Univ Dept Elect Engn Hong Kong Peoples R China Wuhan Univ Sch Elect Engn & Automat Wuhan Peoples R China

This paper proposes an explicit approach to optimal sizing of the integrated battery energy storage systems in hybrid renewable AC/DC islanded microgrids, where the economic impacts of variability management (in concerning operational volatility and uncertainty) are comprehensively investigated. To quantitatively measure the variability levels at different time scales, two indices (i.e. volatility management index and uncertainty management index) are firstly proposed from the perspectives of system planning and operation. Moreover, the probability boundaries of both indices are derived to facilitate the initial system design processes. In particular, the concerned problem is formulated as a bi-level mixed-integer nonlinear programming model to counterbalance the variability and its induced cost at both planning and operation stages. Finally, an original decomposition-coordination algorithm based on the dual decomposition and alternate iterative strategies is proposed to ensure the efficient convergence of the solution process for the constructed mathematical model. Numerical simulations are carried out by analyzing the impacts of various factors associated with optimal sizing solutions and comparing with state-of-the-art approaches. Results show that the proposed sizing technique can facilitate designers finding the optimal capacity combination of renewables and batteries under preset renewables penetration, capital cost, and system variability levels.

关键词： Hybrid AC/DC microgrid System variability Optimal sizing mixed-integer nonlinear programming Decomposition-coordination algorithm

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MINLP SOLUTION FOR AN OPTIMAL ISOTOPE-SEPARATION SYSTEM

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COMPUTERS & CHEMICAL ENGINEERING 1994年第Sup1期18卷 S99-S103页

作者： BOISSETBATICLE, L LATGE, C PIBOULEAU, L JOULIA, X DOMENECH, S ENSIGC ETUD & ANAL PROCEDES LABF-31078 TOULOUSEFRANCE ENSIGC GENIE CHIM LABCNRSURA 192F-31078 TOULOUSEFRANCE

This paper deals with designing of cryogenic distillation systems for the separation of hydrogen isotopes in a thermonuclear fusion process. The design must minimize the tritium inventory in the distillation columns and satisfy the separation requirements. This induces the optimization of both the structure and the operating conditions of the columns. Such a problem is solved by use of a mixed-integer nonlinear programming (MINLP) tool coupled to a process simulator. The MINLP procedure is based on the iterative and alternative treatment of two subproblems : a NLP problem which is solved by a reduced-gradient method, and a MILP problem, solved with a Branch and Bound method coupled to a simplexe. The formulation of the problem and the choice of an appropriate superstructure are here detailed, and results are finally presented, concerning the optimal design of a specific isotope separation system.

关键词： ISOTOPE SEPARATION SYSTEM mixed-integer nonlinear programming PROCESS SYNTHESIS TRITIUM INVENTORY

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Designing a drone delivery network with automated battery swapping machines

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COMPUTERS & OPERATIONS RESEARCH 2021年 129卷 105177-105177页

作者： Cokyasar, Taner Dong, Wenquan Jin, Mingzhou Verbas, Ismail Omer Argonne Natl Lab Energy Syst Div Lemont IL 60439 USA Univ Tennessee Dept Ind & Syst Engn Knoxville TN USA

Drones are projected to alter last-mile delivery, but their short travel range is a concern. This study proposes a drone delivery network design using automated battery swapping machines (ABSMs) to extend ranges. The design minimizes the long-term delivery costs, including ABSM investment, drone ownership, and cost of the delivery time, and locates ABSMs to serve a set of customers. We build a mixed-integer nonlinear program that captures the nonlinear waiting time of drones at ABSMs. To solve the problem, we create an exact solution algorithm that finds the globally optimal solution using a derivative-supported cutting-plane method. To validate the applicability of our program, we conduct a case study on the Chicago Metropolitan area using cost data from leading ABSM manufacturer and geographical data from the planning and operations language for agent-based regional integrated simulation (more commonly known as POLARIS). A sensitivity analysis identifies that ABSM service times and costs are the key parameters impacting the long-term adoption of drone delivery. (C) 2020 Elsevier Ltd. All rights reserved.

关键词： Drone delivery Network optimization mixed-integer nonlinear programming Queueing theory

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Switched NMPC for epidemiological and social-economic control objectives in SIR-type systems

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ANNUAL REVIEWS IN CONTROL 2023年第1期56卷

作者： Sereno, J. E. D'Jorge, A. Ferramosca, A. Hernandez-Vargas, E. A. Gonzalez, A. H. CONICET UNL Inst Technol Dev Chem Ind INTEC Guemes 3450 RA-3000 Santa Fe Argentina Univ Bergamo Dept Management & Informat & Prod Engn Bergamo Italy Univ Idaho Dept Math & Stat Sci Moscow ID USA

Several optimal control strategies have recently been developed to minimize the infected peak prevalence or the epidemic final size. Although these two indexes are critical to assess any control policy tending to mitigate an epidemic by means of non-pharmaceutical measures, they are usually considered separately and, in general, no consensus has been reached about how to simultaneously handle them in a simple and realistic way (i.e., accounting for the limitations in the control actions, avoiding new cycles of infections or reboundings, considering side effects, etc.) Here, based on a theoretical dynamical analysis of SIR-type models, a realistic nonlinear model predictive control strategy is proposed. Apart from minimizing the epidemic final size and keeping the infected peak prevalence under an established value, the controller accounts for feedback uncertainty and different actuator constraints, such as a limited number of social distancing policies, which may remain active for a minimal and a maximal time interval. Several simulations considering different SIR-type models illustrate the benefits of the proposal.

关键词： Switched model predictive control Epidemic control mixed-integer nonlinear programming Discrete control actions

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OUTER APPROXIMATION FOR PSEUDO-CONVEX mixed-integer nonlinear PROGRAM PROBLEMS

JOURNAL OF NONLINEAR AND VARIATIONAL ANALYSIS

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JOURNAL OF nonlinear AND VARIATIONAL ANALYSIS 2024年第2期8卷 181-197页

作者： Wei, Zhou Chen, Liang Yao, Jen-Chih Hebei Univ Hebei Key Lab Machine Learning & Computat Intellig Baoding 071002 Peoples R China Hebei Univ Coll Math & Informat Sci Baoding 071002 Peoples R China Chinese Acad Sci LSEC Acad Math & Syst Sci Beijing 100190 Peoples R China China Med Univ China Med Univ Hosp Res Ctr Interneural Comp Taichung 40402 Taiwan

Outer approximation (OA) for solving convex mixed-integer nonlinear programming (MINLP) problems is heavily dependent on the convexity of functions and a natural issue is to relax the convexity assumption. This paper is devoted to OA for dealing with a pseudo-convex MINLP problem. By solving a sequence of nonlinear subproblems, we use Lagrange multiplier rules via Clarke subdifferentials of subproblems to introduce a parameter and then equivalently reformulate such MINLP as the mixed-integer linear program (MILP) master problem. Then, an OA algorithm is constructed to find the optimal solution to the MNILP by solving a sequence of MILP relaxations. The OA algorithm is proved to terminate after a finite number of steps. Numerical examples are illustrated to test the constructed OA algorithm.

关键词： . Clarke Subdifferential mixed-integer nonlinear programming MILP master program Outer Approximation Pseudo-convexity

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Optimization of loop-network reconfiguration strategies to eliminate transmission line overloads in power system restoration process with wind power integration

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INTERNATIONAL JOURNAL OF ELECTRICAL POWER & ENERGY SYSTEMS 2022年 134卷 107351-107351页

作者： Li, Shaoyan Wang, Liyuan Gu, Xueping Zhao, Hanguang Sun, Yongzhao North China Elect Power Univ Sch Elect & Elect Engn Baoding 071003 Hebei Peoples R China State Grid Changfeng Cty Elect Power Supply Co Hefei 231131 Peoples R China

With large-scale wind power integration, the uncertainty of the wind power outputs will aggravate the transmission line overloads during the black-start restoration process. By constructing regional loop-networks, this paper proposes an optimization method of network reconfiguration strategies to eliminate the line overloads. Firstly, a multi-scenario set of the wind power outputs is constructed based on the extreme scenario method. Secondly, a loop-network reconfiguration optimization model is established to meet the requirements of the multi-scenario set simultaneously, where the line overloads are not permitted. Then, a two-layer solving framework is proposed to solve the optimization model. The upper-level layer is a multi-scenario mixed integer linear programming (MILP) model with the DC power flow constraints, whose objective is to minimize the operation complexity index. The lower-level layer serves to check the standing phase angle (SPA) constraint and the AC power flow constraints of the optimal schemes obtained from the upper-level layer. Therefore, the loopnetwork reconfiguration optimization model is alternatively solved by iterative computation. The effectiveness of the proposed method is verified by the modified IEEE 39-bus system and the modified IEEE 118-bus system, and applicability of this method to practical systems is verified by the southwestern Yunnan power system in China.

关键词： Network reconfiguration Power system restoration Transmission line overloads Wind power penetration mixed-integer nonlinear programming

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Reconstruction of delay differential equations via learning parameterized dictionary

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PHYSICA D-nonlinear PHENOMENA 2023年第1期446卷

作者： Wu, Yuqiang Huazhong Univ Sci & Technol Sch Artificial Intelligence & Automat Wuhan Hubei Peoples R China

Reconstructing the governing equations of unknown systems plays an important role in physics. Sparse modeling methods, such as sparse identification of nonlinear dynamical systems (SINDy), provide a very good framework to tackle this problem. However, SINDy struggles with discovering delay differential equations (DDEs) due to the curse of dimensionality in the candidate dictionary. That is, each possible discrete delay term in the dictionary should be regarded as an independent basis element, which makes the combination of exhaustive discrete delay terms blow up. To deal with the curse of dimensionality and further reconstruct DDEs, a variant method of SINDy is presented in this paper in which a parameterized dictionary is proposed. In the parameterized dictionary, undetermined parameter variables are included in the candidate function to cover a wide range of different functions. Then, the reconstruction problem is reformulated as mixed-integer nonlinear programming (MINLP) and solved by a bi-level algorithm in which the binary version and the continuous version of particle swarm optimization (PSO) are respectively adopted in two levels. Simulation experiments are performed in 5 test systems including 3 well-known chaotic DDEs such as Mackey-Glass system. The results validate the effectiveness of the presented method.

关键词： Sparse identification of nonlinear dynamical systems (SINDy) Delay differential equations (DDEs) Particle swarm optimization (PSO) Parameterized dictionary mixed-integer nonlinear programming (MINLP)

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A new coordination scheme of directional overcurrent and distance protection relays considering time-voltage-current characteristics

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INTERNATIONAL JOURNAL OF ELECTRICAL POWER & ENERGY SYSTEMS 2023年第1期150卷

作者： Assouak, Asma Benabid, Rabah USTHB Elect Engn Dept LSEI Bab Ezzouar 16025 Algeria CRNB Elect Engn Dept Djelfa 17200 Algeria USTHB Elect Engn Dept Elect & Ind Syst Lab LSEI Bab Ezzouar 16025 Algeria

The power transmission systems are mainly protected by distance relays (DisRs) as a primary protection and directional overcurrent relays (DOCRs) as a backup protection. These two types of relays have a different operation principle that, sometimes, leads to miscoordination problems. In this paper, a new approach for DOCRs and DisRs coordination considering the DOCRs time-voltage-current characteristic (TVC-C) is proposed to fully eliminate the miscoordination problems found in the already published works. The coordination problem is formulated as a mixed-integer nonlinear programming (MINLP) considering a new proposed objective function. Furthermore, two new decision variables related to TVC-Cs are proposed namely: the type and the voltage control variable. An enhanced version of the hybrid GSA-SQP method is proposed to solve the developed opti-mization problem. In order to check the applicability of the proposed relays coordination method on small and large and more complex systems, the IEEE 9-bus and IEEE 39-bus are used for this task. The obtained results are compared with the published works which show the superiority of the proposed method in terms of satisfaction of all coordination constraints.

关键词： Time-voltage-current characteristic mixed-integer nonlinear programming Distance relay Directional overcurrent relay Protection coordination Electric power system

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Enabling the direct solution of challenging computer-aided molecular and process design problems: Chemical absorption of carbon dioxide

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COMPUTERS & CHEMICAL ENGINEERING 2023年 174卷

作者： Lee, Ye Seol Galindo, Amparo Jackson, George Adjiman, Claire S. Imperial Coll London Inst Mol Sci & Engn Sargent Ctr Proc Syst Engn Dept Chem Engn London SW7 2AZ England

The search for improved CO2 capture solvents can be accelerated by deploying computer-aided molecular and process design (CAMPD) techniques to explore large molecular and process domains systematically. However, the direct solution of the integrated molecular-process design problem is very challenging as nonlinear interactions between physical properties and process performance render a large proportion of the search space infeasible. We develop a methodology that enables the direct and reliable solution of CAMPD for absorption- desorption processes, using the state-of-the-art SAFT-gamma Mie group contribution approach to predict phase and chemical equilibria. We develop new feasibility tests and show them to be highly efficient at reducing the search space, integrating them in an outer-approximation algorithm. The framework is applied to design an aqueous solvent and CO2 chemical absorption-desorption process, with 150 CAMPD instances across three case studies solved successfully. The optimal solvents are more promising than those obtained with sequential molecular design approaches.

关键词： Computer-aided molecular and process design mixed-integer nonlinear programming Amine solvent design CO2 chemical absorption process SAFT-gamma Mie

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An integrated approach of train scheduling and rolling stock circulation with skip-stopping pattern for urban rail transit lines

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TRANSPORTATION RESEARCH PART C-EMERGING TECHNOLOGIES 2021年 128卷 103170-103170页

作者： Zhao, Shuo Yang, Hai Wu, Yinghui China Acad Railway Sci Corp Ltd Inst Comp Technol Beijing 100081 Peoples R China Hong Kong Univ Sci & Technol Dept Civil & Environm Engn Kowloon Clear Water Bay Hong Kong Peoples R China Jiangsu Univ Sci & Technol Sch Econ & Management Zhenjiang 212100 Jiangsu Peoples R China

Integrated planning for urban rail transit (URT) systems is a significant technique in URT operation to balance service level and operating cost. It is generally oriented towards transportation efficiency and solved in a sequential way due to the complexity, but ignores the service experiences among equitable passengers and the utilization balance among equal rolling stocks. This paper aims to study the integrated planning for an oversaturated URT line, incorporating the fairness in train scheduling and workload balance in rolling stock circulation that are measured by two defined min-max indexes. A mixed-integer nonlinear programming (MINLP) model is established to formulate the integrated planning of stop planning, train scheduling and rolling stock circulation, explicitly considering time-dependent origin-destination demand, first-come-first-serve principle and rigid capacity constraints. Due to the model complexity, an iterative searching approach (ISA) is proposed to solve the model, involving adjusting stop patterns, departure times and connections at the depot terminal. The performance of the ISA is evaluated by three cases with different time lengths based on the practical data from No.8 URT line in Guangzhou. The results are compared with the practical plans and the solutions solved by the two-stage approach respectively. It shows that the ISA can not only mitigate unfairness and balance workload, but also improve transportation efficiency. We also investigate the optimization effects and application conditions of different combinations of searching strategies in the ISA. Furthermore, the study on the typical case during peak hours shows more details about the optimization effects and mechanism of the ISA, which can reach a uniform state in both service level and resource utilization.

关键词： Integrated planning Fairness Workload balance Urban rail transit mixed-integer nonlinear programming Iterative searching approach

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