In this paper, the multiple trajectory search (MTS) is presented for large scale global optimization. The MTS uses agents to solution space concurrently. Each agent does an iterated local using one of three candidate methods. By choosing a method that best fits landscape solutionpsilas neighborhood, may find its way optimum or optimum. We applied seven benchmark problems designed CEC 2008 Special Session and Competition on

With the rapid increase of renewable energy sources and power electronic converters in system, inertia system is declined stability problem more serious than ever before. In this paper, a virtual synchronous generator (VSG) control strategy proposed to enable voltage-source converter-based multiterminal high-voltage direct current (VSC-MTDC) damp low-frequency oscillation modes. Both rotational part governor are modeled VSG controller. The V <sup...

Fast and reliable service restoration strategy is necessary to restore as many out-of-service loads possible in a short time. In this paper, mixed-integer second-order cone programming formulation proposed for of distribution network with distributed generations (DGs). This relaxes the original non-convex power flow equations into conic quadratic format. The employment relaxation great importance because it ensures quality obtained solution. formulated multi-objective optimization problem...

A fast and effective service restoration method is proposed for medium-voltage distribution system with distributed generators by combining intentional islanding of network reconfiguration to maximize out-of-service loads. The whole process divided into four stages: 1) matching schemes; 2) connectivity generators; 3) reconfiguration; 4) optimization load shedding. Whether the last three stages are executed or not depends on violations operational constraints. In accordance topological...

The ever-growing requirement for reliability and quality of power supply suggests to enable self-healing features smart distribution network using intelligent communication control. In this article, a concept fully decentralized multi-agent system (FDMAS) automation is proposed build unified restoration service framework with generators (DGs), where an FDMAS interaction mechanism designed establishing reduced model which can significantly reduce the computational dimensions restoration....

With the rapid development of distributed generation, represented by photovoltaic power, access a large number generation poses threats to security and reliable operation islanded distribution networks. However, relying on energy storage system can stabilize island power supply, which effectively improve reliability network. To this end, under premise knowing output load forecast curve, paper proposes optimization configuration method in active islanding mode multi-source network, satisfies...

To address challenges in locating high-impedance grounding faults (HIGFs) and isolating fault areas resonant systems, this paper proposes a novel identification method based on coordinating Peterson coil resistance system. This ensures power supply reliability by extinguishing the arc during transient with coil. When is determined to be permanent, neutral point switches mode, ensuring regular distribution of zero-sequence currents network, thereby addressing HIGF localization area isolation....

The integration of distributed generations (DGs) is transforming the traditional radial single-source distribution system into a complex multi-source one which requires its related protection able to maintain proper coordination under bidirectional power flow conditions. Although conventional backup methods are effective up certain level DG penetration, they incompetent for higher service demands such as high penetration and protective rapidity. To deal with problem, fast reliable strategy...

Abstract The threat of a malicious attack is one the major security problems in complex networks. Resilience system-level self-adjusting ability network to retain its basic functionality and recover rapidly from disruptions. Despite numerous heuristic enhancement methods, there research gap maximizing resilience: current methods are designed immunize vital nodes or modify specific onion-like structure cannot maximize resilience theoretically via structure. Here we map networks onto physical...

In recent years, many algorithms for solving multiobjective (MO) optimization problems were proposed. Some studies on the design of test and performance evaluation also suggested. this paper, we proposed a novel searching algorithm called multiple trajectory search (MTS). The MTS uses agents to solution space concurrently. Each agent does an iterated local using one four candidate methods. By choosing method that best fits landscape solution's neighborhood, may find its way optimum or global...

Low-inertia power grids could suffer from large frequency excursions under even small disturbances. When a voltage source converter-based high direct current (VSC-HVDC) system is used to integrate low-inertia grid into main grid, an ancillary support service can be provided the by VSC-HVDC system. This paper proposes perturbation observer-based fast controller (POFFS) of systems improve stability grids. According feedback linearization and gain observer technique, inverter station designed...

A numerical technique based on the variational principle and finite element method is developed for studying wave propagation problem an arbitrary inhomogeneous dielectric slab. The equation boundary value formulated then solved numerically by method. energy criterion estimating error in solution presented. Numerical results linear, parabolic, sinusoidal profiles are included.

A numerical technique based on an integral equation scheme is developed for solving the direct scattering problem inhomogeneous slab. The derived, using induced current concept and Green's function technique. method of presented. proved to be numerically satisfactory applied slab specific profiles. Numerical results several cases are also included.

Many scientific articles have been written about electromagnetic field distributions under high voltage overhead transmission lines. However, some readers are still left wondering just how exactly the distribution curves formed by fields related to mathematical models used. This paper presents case study results of a 500 kV alternating current line, and explicitly shows vary lines employing easily understood models. The numerical simulations, done using MATLAB, can help anyone willing...

In this paper, the Multiple Trajectory Search (MTS) is presented for single objective constrained real-parameter optimization problems. The MTS uses multiple agents to search solution space concurrently. Each agent does an iterated region using one of three candidate methods. By choosing a method that best fits landscape solution's neighborhood, may find its way local optimum or global optimum. We applied eighteen benchmark problems designed CEC 2010 Competition on Single Objective...

Online security early warning and preventive control are important parts of self-healing for smart distribution system. The structure presented in this paper. Preventive is equivalent to a multi-stages decision problem, which divided into three stages: regulation output distributed generators reactive power compensation device, network reconfiguration exchanging the status between sectionalizing switches tie switches, load shedding. Whether stage executed or not based on value state...

Wireless sensor networks (WSNs) are widely used in detecting, locating and tracking the moving objects. However, some of cheap, low-powered energy-limited sensors that deployed large areas may use up their energy, which leads to whole network failure finally. In order reduce energy consumption prolong lifetime, (a) a new light-weight energy-efficient scheme is proposed estimate current target location; (b) an parallel algorithm based on gene expression programming (P-GEP) put forward for...

We propose a new methodology to predict minimum operating voltage (V <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">min</inf> ) for production chips. In addition, we two key features improve the prediction accuracy. Our proposed accumulative learning can reduce impact of lot-to-lot variations. Experimental results on 7nm industry designs (about 1.2M chips from 142 lots) show that achieve above 95% good prediction. save 75% test time compared...

Conceptual design schemes of turning-milling hybrid machine tool with 3-PRS parallel mechanism was given. The kinematics characteristics the were analyzed. inverse position solution derived. And forward got by transforming object method. Velocity and acceleration deduced using d'Alembert's principle for passive joint position. It avoids complexity spatial direct derivative Three additional motions produced at movement driving platform indispensable.

Service restoration plays a vital role in improving the resiliency and reliability of distribution network. It is necessary to develop robust service scheme for restoring out-of-service loads short time. In this paper, mixed-integer second-order cone programming (MISOCP) model proposed This relaxes branch power flow equations into convex format. The employment formulations great significance because it ensures that obtained solution global optimal. formulated as multi-objective optimization...