Showing papers in "Electric Power Systems Research in 1999"

TL;DR: In this article, an efficient and robust three phase power flow algorithm for application to radial distribution networks is presented. And the proposed method has been tested to analyse several practical distribution networks of various voltage levels and also having high R/X ratio.

TL;DR: In this article, the authors used analytical hierarchy process (AHP) methodology to perform a comparison between the different electricity power production options in Jordan, in addition to fossil fuel power plants, are nuclear, solar, wind, and hydro-power.

TL;DR: This paper proposes to couple the novel ant colony search algorithm (ACSA) with other search techniques to improve its performance, and the numerical results reported are encouraging.

TL;DR: In this article, a new approach using evolutionary programming for solving the economic dispatch (ED) problem of generators when some/all of the units have prohibited operating zones is presented. And the results obtained by this new approach are compared with those obtained using traditional methods.

TL;DR: In this paper, a robust controller for the load frequency controller of interconnected power systems with uncertain parameters is presented, where a combination of matching conditions and Lyapunov stability theory is adopted to implement a robust stabilizing controller.

TL;DR: An efficient short-term hydrothermal scheduling algorithm based on the evolutionary programming (EP) technique is proposed in this article, where the power balance constraints, total water discharge constraint, reservoir volume constraints and the constraints on the operation limits of the equivalent thermal and hydro units are fully taken into account.

TL;DR: In this paper, a new algorithm based on integrating the use of genetic algorithms and tabu search methods to solve the unit commitment problem is presented, which is mainly based on genetic algorithms, which incorporates Tabu search method to generate new population members in the reproduction phase of the genetic algorithm.

TL;DR: A new approach for total real power Transmission losses, as a linear function of generated real power; its effect and influence on the minimum cost of fuel and the result of real power transmission losses is proposed.

TL;DR: In this paper, a new method to fault section estimation problem in power systems is developed using Ant System, which appears to be of promise for the fault-section estimation problem.

TL;DR: In this paper, the effect of aging on transformer oil physical, chemical and electrical properties has been studied using the international testing methods for the evaluation of transformer oil quality, and the validity and applicability of these models for future prediction of these properties have been verified by the good agreement between the measured end predicted values.

TL;DR: In this article, an on-line calibration method using pulse injection through tap of high voltage transformer bushings is described. But, this method is not suitable for on-site partial discharge (PD) monitoring.

TL;DR: In this article, an induction motor drive for use in electric propulsion is described, where direct torque control (DTC) is used to control the motor, and efficiency is optimized by adjusting the magnetic flux of the motor.

TL;DR: In this paper, an approach which combines Lagrangian relaxation principle and evolutionary programming for short-term thermal unit commitment is proposed, which takes the advantages of both methods and therefore it can search a better solution within short computation time.

TL;DR: In this paper, an approach for finding ferroresonance occurrence domains has been developed, where the steady state solutions are calculated by the Galerkin method and a bifurcation diagram is created using a continuation method.

TL;DR: It is shown that the proposed TS-based algorithm has higher efficiency and better convergence than the previously proposed methods.

TL;DR: In this paper, a multistage modernization problem for power systems with series-parallel structure is addressed, where the goal is to minimize the sum of costs of system modernization actions over the study period while satisfying reliability constraints at each stage.

TL;DR: In this paper, a methodology for the detection of high impedance faults in radial distribution feeders is presented, which consists of making comparative analysis of the responses of a feeder to pulses injected at the feeder inlet for different configurations.

TL;DR: In this paper, the authors proposed a load model where real and apparent power are exponentially dependent on voltage to avoid unreliability of the reactive power voltage exponent, and the error that could be made by assuming constant power factor of the load during voltage variation is estimated.

TL;DR: In this paper, the authors proposed a genetic algorithm to solve the optimal power dispatch problem for a multi-node auction market, which maximizes the total participants' benefit at all nodes in the system.

TL;DR: An optimal multiplier based Newton-Raphson power flow algorithm for reliably and efficiently handling power systems with embedded flexible AC transmission systems (FACTS) devices such as unified power flow controllers (UPFCs) is presented.

TL;DR: An adaptive neuro-fuzzy inference system (ANFIS) for volt/var control in distribution systems and application to a practical 30-bus system illustrates the economic benefits and numerical results achievable through the fuzzy connectionist scheme.

TL;DR: In this article, the authors presented a new model to represent transmission lines including the frequency dependence of longitudinal parameters, using the natural modes, for ideally transposed lines and quasi-modes for non-transposed lines, and applied to lines that have a vertical symmetry plane.

TL;DR: In this article, the authors identify the status of electromagnetic field exposure assessment research related to occupational exposures and highlight the research needs for exposure assessment in the home and utilities environments, where the intensities of electromagnetic fields have been measured under power transmission and distribution lines, at substations and industrial plants and near various electric devices including domestic electrical equipment.

TL;DR: In this article, a new method based on heuristics and greedy search technique has been reported in this paper for the placement of capacitors in radial distribution system, where heuristic rules have been developed to determine the probable capacitor locations in a distribution network.

TL;DR: In this paper, a radial basis function network based power system stabilizer (RBFN PSS) is proposed to tune power system parameters on-line based on real-time measurements of machine loading conditions.

TL;DR: In this article, the electrochemical mechanism of aqueous corrosion is outlined and it is demonstrated that the process depends upon a complex interaction between the material and its environment given the particular circumstances of exposure.

TL;DR: In this article, passive shielding schemes are implemented to manage the magnetic fields of power cables, which can be separated into two broad categories: shielding subject and shielding source, and the most powerful technique is the passive shielding scheme, as the reductions obtained are sometimes as high as 97-98%.

TL;DR: In this paper, the performance of three-phase active power filters under non-ideal voltage scenarios is investigated, and a new active power filter design is proposed for solving such problems, which not only shows its effectiveness in the tests, but also implements with a simpler control circuit when compared with the other algorithm.

TL;DR: In this paper, the problem of load shedding as an emergency means for avoiding occurrence of voltage instability in distribution and transmission power systems is addressed, where the optimal locations of loads to be shed are found together with their optimum required quantities.

TL;DR: In this paper, a merit order loading (MOL) method was proposed to solve the real-time economic dispatch (ED) problem with linear decreasing and staircase incremental cost (IC) functions for combined cycle (CC) units.