Showing papers in "Electric Power Systems Research in 1998"

TL;DR: In this paper, a new approach to dispersed generation planning based on Hereford ranch algorithm (HRA) in a subtransmission system is presented, which optimally locate such generation in a meshed network for maximizing the potential benefits.

TL;DR: In this article, the authors considered the setting of flexible AC transmission system (FACTS) devices as additional control parameters in the optimal reactive power dispatch (ORPD) formulation and studied the impact on system loss minimization.

TL;DR: This paper presents the application of well known recursive estimation techniques to the important problem of power system harmonics in a noisy environment using several variants of recursive least square (RLS) algorithms, known for their simplicity of computation and good convergence properties.

TL;DR: In this article, an analysis and comparison of earth fault characteristics in the medium voltage distribution networks (20 kV) with high impedance earthing is presented, based on the evaluation of 476 real case data recordings, obtained from substations of distribution networks with an unearthed or a compensated neutral during the observation period of 3 years, 1994-1996.

TL;DR: A fuzzy fault-tree based reliability analysis of an optimally planned transmission system is presented and a maximum reliable configuration is derived by adding lines step by step in the routes with the highest positive RII value.

TL;DR: The wavelet transform approach is proposed in this paper to classify various power system disturbances into different groups so that operators can decide on strategies to suppress or eliminate them effectively.

TL;DR: In this paper, the basic differences between an ''impedance based'' controllable series compensation (CSC) and a static synchronous series compensator (SSSC), which is based on power electronic converters with GTO thyristors, were investigated.

TL;DR: In this paper, a new control scheme of a three-phase active power filter (APF) is proposed to eliminate harmonics, to compensate reactive power and neutral currents and to remedy system unbalance, in a 3-phase four-wire electric power distribution system, with unbalanced nonlinear loads.

TL;DR: In this article, a method to compute voltage collapse proximity based on new operational load flow (OLF) and sensitivity of reactive control variables was proposed to improve voltage stability in Indian power networks.

TL;DR: In this paper, the effects of different unbalanced voltages with the same voltage unbalance factor (VUF) on the performance of a three-phase induction motor and its feedback influence on the power system were investigated.

TL;DR: In this article, the wavelet representation of voltage flicker signal is presented in three steps, and a multiresolution analysis (MRA) scheme that is an orthonormal wavelet transform is applied to decompose the demodulated signal into several components according to the scales.

TL;DR: In this article, an adaptive neural network approach for the estimation of harmonic distortions and power quality in power networks is presented, which is based on the use of linear adaptive neural elements called adalines.

TL;DR: In this paper, the authors present an analytical study of an active shielding arrangement to attenuate the 60 Hz magnetic fields produced by a transmission line at p points inside a cubic space, which consists of three sets of n orthogonal square coils, placed around the x, y and z -axes.

TL;DR: In this article, two new methods for power flow and short circuit analyses are proposed for radial and weakly meshed networks, which are based on the branch by branch computational approach.

TL;DR: In this paper, the problem of optimization of a power system structure which cannot be reduced to series or parallel combinations is considered, and a procedure which determines the minimal cost system configuration subject to reliability constraints is proposed which provides solutions with different structure topology.

TL;DR: The Australian electricity industry restructuring process involves functional separation, corporatisation and, in some cases, privatization of the pre-existing state-owned supply authorities as discussed by the authors, and the end point will be, for the southern and eastern states, a multi-region ''national electricity market'' (NEM) which is regulated at the federal government level, and retail electricity markets which are implemented and regulated at state government level.

TL;DR: The gas insulated transmission line (GIL) as discussed by the authors is a technology developed for the needs of the 21st century, where huge metropolitan areas need an electrical supply for the public and industry.

TL;DR: A comparative study of sliding mode and model reference adaptive speed observers for a speed sensorless induction motor (IM) drive is introduced and the effectiveness of the proposed sliding mode speed observer is demonstrated.

TL;DR: In this paper, a GA-based approach to the service restoration problem in automated distribution networks is presented, where the hybridization strategy of the GA is presented in depth, with particular regard to the description of some new operators, of the objective function and of the constraints expression.

TL;DR: In this paper, a probabilistic algorithm for determining the effect of initial state variation on the dynamic stability of power systems is presented, where the expected coefficient matrix in the state space equation is corrected by the second-order covariances.

TL;DR: In this article, the authors propose to decompose the global generator/transmission scheduling problem into a master problem and sub-problems using Benders decomposition to minimize operation costs while satisfying the network constraints.

TL;DR: In this article, a gain scheduling PID stabilizer is designed for excitation control of power systems using fuzzy logic, which is tuned on-line using a fuzzy rule base and a fuzzy inferencing mechanism for manipulating the speed error and its derivative.

TL;DR: In this paper, the integer periodic extension (IPE) method is proposed to overcome the two major defects on the Fourier spectrum resulting from a data window function and fast Fourier transform (FFT) in power system harmonic measurement.

TL;DR: In this article, a finite element method is proposed to evaluate the losses generated in the bars and steel plates, which are then used as the heat sources for thermal analysis, and the numerical results of this method are good and comparison with test data are presented.

TL;DR: A method based on the tangent vector technique has been shown to be accurate as a voltage stability index and also as an indicator of the system weak area and this technique is tested in this paper with different load scenarios.

TL;DR: In this article, a variable-speed induction generator is used to supply an autonomous power system with reactive power requirements, which are met by a static reactive power compensator of voltage source inverter (VSI) type.

TL;DR: A comparison between power system response using the proposed SVC stabilizer and without adding the control signal of fuzzy adaptive mechanism is presented and the results show the effectiveness and power of the presented SVC.

TL;DR: In this paper, a wavelet transform analysis-based adaptive single-pole autoreclosure (SPAR) scheme for EHV transmission systems is presented. And the wavelet analysis technique can be used as an attractive and effective means of developing an adaptive autoreclosing scheme.

TL;DR: In this paper, an adaptive neural speed controller of a dc motor is proposed, which is trained by an online backpropagation algorithm, and the output of the ANN gives the control voltage applied to the dc motor.

TL;DR: In this article, the analytical hierarchy process (AHP) is incorporated into the construction procedure of linear additive utility models to facilitate the process of eliciting single utility functions and weighting parameters.