Journal of Artificial Intelligence in Electrical Engineering
Volume:2 Issue: 5, Spring 2013

The well-known electro-mechanical analogy that equates current, voltage, resistance, inductance and capacitance to force, velocity, damping, spring constant and mass has a shortcoming in that mass can only be used to simulate a capacitor which has one terminal connected to ground. A new model that was previously proposed by the authors that combines a mass with a pulley (MP) is shown to simulate a capacitor in the general case. This new MP model is used to model the off-diagonal elements of a mass matrix so that devices whose effective mass is coupled between more than one actuator can be represented by a mechanical system diagram that is topographically parallel to its equivalent electric circuit model. Specific examples of this technique are presented to demonstrate how a mechanical model can be derived for both a serial and a parallel robot with both two and three degrees of freedom. The technique, however, is extensible to any number of degrees of freedom.

Power system stabilizers (PSSs) must be capable of providing appropriate stabilization signals over a broad range of operating conditions and disturbances. The main idea of this paper is changing a classic PSS (CPSS) to an adaptive PSS using genetic algorithm. This new genetic algorithm based on adaptive PSS (GAPSS) improves power system damping, considerably. The controller design issue is formulated as an optimization problem that is solved by GA to identify PSS parameters in various operating conditions. Numerical simulation studies have been done on a modified model of IEEE second benchmark. The consequence of these studies shows that, the performance of the suggested genetic algorithm based adaptive PSS in damping of electromechanical oscillations of power system is better than CPSS.

In this paper, a new design of demultiplexer based on two-dimensional photonic crystal ring resonator is proposed. The structure is made of a hexagonal lattice of silicon rods with the refractive index 3.46 in coefficient of air with refractive index 1. The transmission efficiency and Quality factor for our proposed demultiplexer, respectively, are more than 65% and 1600. The normalized transmission spectra of the photonic crystal ring resonator are taken using Two-dimensional (2D) Finite Difference Time Domain (FDTD) method. The photonic band gap is calculated by Plane Wave Expansion (PWE) method.

The goal of paper is to present the magnetic field calculations in high current bus ducts. Finite element method is used to do this. Bus ducts under study have figure such as circle area. The calculations will be using mathematical relations, meshed geometric shape and analyzing them. Geometric mean will help us to determine the value of magnetic field. COMSOL software is applied for simulation studies. Calculations have been analyzed in three phase state and also, simulations are implemented into the three dimensional position. Demonstration procedure and numerical calculations are used for presentation the front of view of bus duct. Skin effect and connection configuration between bus ducts are considered in the calculations. Aforementioned method can be used in the magnetic fields analyzing in transmission lines and electrical energy link which consist of insulator, easily. Typical bus duct which is applied in simulation studies produced by a pars generator corporation, it has been installed in Ardebil substation.

In this paper, two training systems for selecting PLIP parameters have been demonstrated. The first compares the MSE of a high precision result to that of a lower precision approximation in order to minimize loss of information. The second uses EMEE scores to maximize visual appeal and further reduce information loss. It was shown that, in the general case of basic addition, subtraction, or multiplication of any two images, γ, k, and λ = 1026 and β = 2 are effective parameter values. It was also found that, for more specialized cases, it can be effective to use the training systems outlined here for a more application-specific PLIP. Further, the case where different parameter values are used was shown, demonstrating the potential practical application of data hiding.

In recent years, automatic recognition of vehicle logos has become one of the important issues in modern cities. This is due to the unlimited increase of cars and transportation systems that make it impossible to be fully managed and monitored by human. In this research, an automatic real-time logo recognition system for moving cars is introduced based on histogram manipulation. In the proposed system, after locating the area that contains the logo, image matching technique and textural features are utilized separately for vehicle logo recognition. Experimental results show that these two methods are able to recognize four types of logo (Peugeot, Renault, Samand and Mazda) with an acceptable performance, 96% and 90% on average for image matching and textural features extraction methods, respectively.

In this paper, the optimal design of supplementary controller parameters of a unified power flow controller(UPFC) for damping low-frequency oscillations in a weakly connected system is investigated. The individual design of the UPFC controller, using hybrid particle swarm optimization and gravitational search algorithm (PSOGSA)technique under 3 loading operating conditions, is discussed. The effectiveness of proposed controller on enhancing dynamic stability is tested through eigenvalue analysis and time domain simulation. Also nonlinear and electrical simulation results show the validity and effectiveness of the proposed control schemes over a wide range of loading conditions. It is also observed that the proposed UPFC-based damping stabilizers greatly enhance the power system transient stability. Also, simulation results of coordinated design of stabilizer based on δE and mB is presented and discussed,the system performance analysis under different operating conditions show that the δE-based controller is superior to the mB-based controller.

Along with economic growth of countries which leads to their increased energy requirements, the problem of power quality and reliability of the networks have been more considered and in recent decades, we witnessed a noticeable growing trend of distributed generation sources (DG) in distribution networks. Occurrence of DG in distribution systems, in addition to changing the utilization of these systems, has provided the opportunity for these companies to be able to design systems with lower costs. In this paper, the problem of placement and capacity determination of DG were carried out using multiple methods. The main objectives of issue were improving the voltage profile, losses reduction and reduce the cost of operation that were carried out based on an economic function. Using the multiple methods to improve some purposes and utilization of weighting coefficients provided an appropriate plan. DAPSO algorithm was used for optimization and various experiments carried out on real network.