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Improved genetic algorithm for optimal demand response in smart grid

SUSTAINABLE COMPUTING-INFORMATICS & SYSTEMS 2022年 35卷

作者： Jeyaranjani, J. Devaraj, D. Kalasalingam Acad Res & Educ Dept Comp Sci & Engn Srivilliputhur Tamil Nadu India Kalasalingam Acad Res & Educ Dept Elect & Elect Engn Srivilliputhur Tamil Nadu India

In Smart Grid system, the consumers are provided with the opportunity to schedule their home appliances in response to variations in electricity price over time. This paper presents the optimal scheduling of resident ap-pliances. This optimal scheduling is formulated as an optimization problem and is solved by applying improved Genetic algorithm (GA). In this improved GA, the selection of chromosomes is carried out using entropy method, blended crossover and mutation is performed using correlation coefficient. The simulation is performed for a single resident load profile for a set of appliances using Python programming. The result shows the reduction in the electricity cost to that of the original. The number of iterations taken by the improved Genetic algorithm (GA) is comparatively lesser than the standard GA and the execution time is reduced by 2.76 s. Thus the result proves the effectiveness of the proposed improvisation in Genetic algorithm for optimal load scheduling.

关键词： Energy consumption Genetic algorithm Load scheduling Demand Response optimization algorithm Energy management system Real time pricing

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Determination of relative permeability curve under combined effect of polymer and surfactant

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JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING 2022年第PartA期215卷

作者： Zhang, Wenlong Hou, Jian Liu, Yongge Zhou, Kang Li, Zhenquan Du, Qingjun China Univ Petr East China Key Lab Unconvent Oil & Gas Dev Minist Educ Qingdao 266580 Peoples R China Qingdao Natl Lab Marine Sci & Technol Lab Marine Mineral Resources Qingdao 266237 Peoples R China China Univ Petr East China Sch Petr Engn Qingdao 266580 Peoples R China Shandong Univ Sci & Technol Coll Energy & Min Engn Qingdao 266580 Peoples R China SINOPEC Shengli Oilfield Branch Co Dongying 257015 Peoples R China

Relative permeability of surfactant-polymer (SP) flooding is determined by an inversion method based on numerical simulation and unsteady-state coreflooding experiment. Compared with the common methods, this method is more time-saving and simpler than steady-state method, and considers more physicochemical properties (adsorption and diffusion) of SP than unsteady-state method based on Buckley-Leverett theory. It is also more applicable to reservoir engineering than pore-scale simulation. After the reliability is confirmed, the superiority of the method is strongly proved by studying the influence of adsorption and diffusion of SP on relative permeability. Comparing relative permeability with and without effect of adsorption and diffusion of SP, the findings show adsorption and diffusion of SP significantly reduce the average inversion error of relative permeability curve from 11.9 to 3.7 for oil and from 10.7 to 1.8 for water. On this basis, the variations of SP flooding relative permeability under the effect of polymer and surfactant are discussed in turn. In the existing researches, the quantitative characterization of variation of SP-flooding relative permeability curves is limited by curve crossing and endpoint saturation changes. In this work, normalized relative permeability is introduced to eliminate the adverse effect caused by curve crossing and endpoint saturation changes. The findings show that although the rise of aqueous-phase viscosity reduces water relative permeability, it has little effect on normalized water relative permeability. Normalized oil and water relative permeability increase in logistic functions with the decrease of IFT in semi-logarithmic plot. Water relative permeability at residual oil endpoint decreases linearly as aqueous-phase viscosity increases, and increases exponentially as IFT decreases in semi-logarithmic plot. Ultimately, the functional models based on normalized relative permeability and cubic B-spline are built through mu

关键词： Surfactant-polymer flooding Relative permeability Numerical simulation Interfacial tension optimization algorithm

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Hybrid fuzzy evaluation algorithm for power system protection security assessment

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ELECTRIC POWER SYSTEMS RESEARCH 2020年 189卷 106555-106555页

作者： Meyer, Georg Janick Lorz, Tobias Wehner, Rene Jaeger, Johann Dauer, Maximilian Krebs, Rainer Friedrich Alexander Univ Erlangen Nurnberg Erlangen Germany Siemens AG Erlangen Germany

System Protection Security Assessment is an important task in modern energy grids to ensure system security at all. The assessment system is particularly challenged by multivariate grid structures caused by volatile renewable infeeds. This paper presents an innovative strategy to evaluate the protection relay coordination of system-wide power grids. A way to calculate the quality of all protection relays based on realistic simulation data and independent of the protection method was sought. The hybrid algorithm consists of two major steps. First, a systematic analysis with various fault simulations is performed and the measurement results of all relays of all simulations are used as database. Subsequently, the use of fuzzy sets allows to express the quality of each relay setting regardless of its type. Specifically developed for the use of an optimization algorithm, finally, a new protection coordination is determined for an adapted version of the IEEE 9 bus grid. The results are validated, discussed and the effectiveness of the methodology compared to conventional setting rules.

关键词： Fuzzy evaluation Relay settings optimization algorithm Protection coordination Protection security assessment

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HYPERVELOCITY GLIDING MANEUVERS

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JOURNAL OF AIRCRAFT 1987年第8期24卷 572-574页

作者： TAUBER, ME NASA Ames Research Center Moffett Field California

The ability to maneuver within the atmosphere during orbital return is a major advantage of high-lift vehicles. For example, a maximum lift/drag ratio of nearly 2 affords the Space Shuttle orbiter a choice of several landing sites. In addition, the Shuttle can be rolled during entry while still maintaining a shallow glide trajectory. This roll maneuver during entry reduces the descent time and, therefore, the total heat input, although the heating rate is increased. One typical measure of maneuvering capability is the maximum lateral range that a vehicle can achieve;the solution to this problem was originally given. Another important maneuver consists of performing turns that change the vehicle's heading. This paper contains a brief analysis of turning maneuvers during gliding flight, including lateral distances traversed, at velocities up to circular satellite speed.

关键词： Aerodynamic Force Lift Drag Ratio Satellites Yaw Control Flight Altitude Earth NASA Ames Research Center optimization algorithm Space Shuttle Orbiter Mathematical Models

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The alternating direction method of multipliers for finding the distance between ellipsoids

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APPLIED MATHEMATICS AND COMPUTATION 2021年 409卷 126387-126387页

作者： Dolgopolik, Maksim, V Russian Acad Sci Inst Problems Mech Engn VO Bolshoj Pr 61 St Petersburg 199178 Russia

We study several versions of the alternating direction method of multipliers (ADMM) for solving the convex problem of finding the distance between two ellipsoids and the non convex problem of finding the distance between the boundaries of two ellipsoids. In the convex case we present the ADMM with and without automatic penalty updates and demonstrate via numerical experiments on problems of various dimensions that our methods significantly outperform all other existing methods for finding the distance between ellipsoids. In the nonconvex case we propose a heuristic rule for updating the penalty parameter and a heuristic restarting procedure (a heuristic choice of a new starting for point for the second run of the algorithm). The restarting procedure was verified numerically with the use of a global method based on KKT optimality conditions. The results of numerical experiments on various test problems showed that this procedure always allows one to find a globally optimal solution in the nonconvex case. Furthermore, the numerical experiments also demonstrated that our version of the ADMM significantly outperforms existing methods for finding the distance between the boundaries of ellipsoids on problems of moderate and high dimensions.& nbsp;(c) 2021 Elsevier Inc. All rights reserved.

关键词： ADMM Ellipsoid Distance optimization algorithm Nonconvex optimization

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Cost-effective test case generation with the hyper-heuristic for software product line testing

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ADVANCES IN ENGINEERING SOFTWARE 2023年 175卷

作者： Sulaiman, Rabatul . Aduni Jawawi, Dayang . N. A. Halim, Shahliza . Abdul Univ Tun Hussein Onn Malaysia Fac Comp Sci & Informat Technol Software Engn Dept Parit Raja 86400 Johor Malaysia Univ Teknol Malaysia Fac Comp Software Engn Dept Johor Baharu 81310 Malaysia

Implementation of optimization algorithm for test case generation in Model-Based Testing (MBT) for Software Product Line (SPL) has been increasing, due to the demand for optimal test case results with a balanced trade-off between cost and effectiveness measure. This paper proposed a hyper-heuristic test cases generation approach in MBT for SPL called Improvement Selection Rules-Modified Choice Function (ISR-MCF). ISR-MCF is implemented with three search operators which are Non-Dominated Sorting Genetic algorithm II with low-level heuristic (NSGA-II-LLH), Strength Pareto Evolutionary with Low-Level Heuristic (SPEA 2-LLH) and Particle Swarm optimization with Low-Level Heuristic (PSO-LLH). The approach was evaluated with a test model and the result shows that the proposed ISR-MCF with NSGA-II-LLH outperforms other existing rules for minimization measure (size of a test suite and execution time and maximization measure (coverage criteria).

关键词： Software testing optimization algorithm Software product line Cost effectiveness measure

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Analysis of Weak-Stability-Boundary Transfers from Earth to Mars

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JOURNAL OF SPACECRAFT AND ROCKETS 2019年第4期56卷 1006-1016页

作者： Dutt, Pooja Anilkumar, A. K. George, R. K. Vikram Sarabhai Space Ctr Appl Math Div Thiruvananthapuram 695022 Kerala India Indian Inst Space Technol Thiruvananthapuram 695547 Kerala India

This paper analyzes transfer trajectories from Earth to Mars with ballistic capture. To begin with, the dynamics of capture orbits on Mars is studied in the framework of a restricted three-body problem. Subsequently, an algorithm is developed to find the weak-stability-boundary trajectories from Earth to Mars in high-fidelity force model taking into account the launch vehicle's payload capabilities. This algorithm was able to find a number of capture trajectories to Mars for all the cases considered in the study.

关键词： Weak Stability Boundary Trajectory Giant Planet Launch Vehicles Orbital Period Heliocentric Orbit Histograms Interplanetary Mission Right Ascension Small Missions for Advanced Research in Technology optimization algorithm

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Low-sidelobe marine radar microstrip array antenna based on hybrid algorithm and metamaterial

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INTERNATIONAL JOURNAL OF RF AND MICROWAVE COMPUTER-AIDED ENGINEERING 2022年第1期32卷 e22916-e22916页

作者： Lin, Kangjian Fang, Shaojun Liu, Hongmei Dalian Maritime Univ Sch Informat Sci & Technol Dalian 116026 Peoples R China

A microstrip array antenna with low sidelobe level (SLL) for X-band marine radar is proposed. The antenna is composed of a 32-element patch array and a three-layer near-zero-index metamaterial (NZIM). The IABC-Kmeans algorithm, which combines the improved artificial bee colony algorithm and K-means clustering algorithm, is used to optimize the current amplitude of the array elements to obtain a lower SLL. The NZIM is loaded in front of the array antenna to reduce the beamwidth of the E-plane. The antenna is designed and fabricated. The measurement results show that the gain of the antenna at the center frequency is 22.7 dBi, the SLLs of H-plane and E-plane are -30.66 dB and - 26.78 dB respectively, and the half-power beamwidth of H-plane is 5.9 degrees. Compared with the previous similar antenna structures, the antenna has lower SLL under the premise of narrow beam and high gain, which is very suitable for X-band marine radar of small and medium fishing vessels.

关键词： low side lobe marine radar antenna metamaterials optimization algorithm

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High-Gain Wideband Metasurface Antenna With Low Profile

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IEEE ACCESS 2019年 7卷 177266-177273页

作者： Bai, Hao Wang, Guang-Ming Wu, Ting Air Force Engn Univ Air Def & Antimissile Inst Xian 710051 Peoples R China Xian Univ Technol Automat & Informat Engn Inst Xian 710048 Peoples R China

In this paper, a novel compact wideband and high-gain antenna based on metasurface is proposed. The antenna is an octagon with a side length of 32.3 mm and a height of 5.6 mm. The metasurface consists of two stacking layers, and both layers contain a 4x4 copper patch array. The antenna is excited by an aperture coupled structure made of an anomalous microstrip line and a narrow slot etched in the ground plane. Genetic algorithm (GA) is adopted to optimize all the parameters and obtain the valid performance of the metasurface antenna. Moreover, the antenna is modified by introducing nonuniform patch. Modification leads to varying degrees gain enhancement, and the peak is approximately 1.5 dB at 6.1GHz. The impedance bandwidth of the proposed antenna is 54.9%, ranging from 4.48-7.87 GHz. A prototype of the antenna is fabricated, and the measured results verify the design.

关键词： Wideband metasurface optimization algorithm nonuniform patch high gain

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Solving Logistics Distribution Center Location with Improved Cuckoo Search algorithm

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INTERNATIONAL JOURNAL OF COMPUTATIONAL INTELLIGENCE SYSTEMS 2021年第1期14卷 676-692页

作者： Li, Juan Yang, Yuan-Hua Lei, Hong Wang, Gai-Ge Hubei Normal Univ Sch Comp & Informat Engn Huangshi 435002 Hubei Peoples R China Wuchang Univ Technol Sch Artificial Intelligence Wuhan 430223 Peoples R China Jilin Univ Key Lab Symbol Computat & Knowledge Engn Minist Educ Changchun 130012 Peoples R China Ocean Univ China Dept Comp Sci & Technol Qingdao 266100 Peoples R China Guangxi Univ Nationalities Guangxi Key Lab Hybrid Computat & IC Design Anal Nanning 530006 Peoples R China

As a novel swarm intelligence optimization algorithm, cuckoo search (CS), has been successfully applied to solve various optimization problems. Despite its simplicity and efficiency, the CS is easy to suffer from the premature convergence and fall into local optimum. Although a lot of research has been done on the shortage of CS, learning mechanism has not been used to achieve the balance between exploitation and exploration. Based on this, a differential CS extension with balanced learning namely Cuckoo search algorithm with balanced-learning (O-BLM-CS) is proposed. Two sets, the better fitness set (FSL) and the better diversity set (DSL), are produced in the iterative process. Two excellent individuals are selected from two sets to participate in search process. The search ability is improved by learning their beneficial behaviors. The FSL and DSL learning factors are adaptively adjusted according to the individual at each generation, which improve the global search ability and search accuracy of the algorithm and effectively balance the contradiction between exploitation and exploration. The performance of O-BLM-CS algorithm is evaluated through eighteen benchmark functions with different characteristics and the logistics distribution center location problem. The results show that O-BLM-CS algorithm can achieve better balance between exploitation and exploration than other improved CS algorithms. It has strong competitiveness in solving both continuous and discrete optimization problems. (C) 2021 The Authors. Published by Atlantis Press B.V.

关键词： Cuckoo search algorithm Balanced-learning The better fitness set The better diversity set optimization algorithm

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