Showing papers in "International Journal of Electrical Power & Energy Systems in 1995"

TL;DR: In this paper, a simple and efficient method for solving radial distribution networks is presented, which involves only the evaluation of a simple algebraic expression of voltage magnitudes and no trigonometric functions as opposed to the standard load flow case.

TL;DR: In this paper, the conditions needed for detecting saddle-node bifurcations using power flow equations for a dynamic model of ACIDC systems, represented by differential equations and algebraic constraints, were presented.

TL;DR: In this article, a mixed integer and I linear programming model is used to solve the decision problem of determining the economically optimum energy mix during short and long term periods, and a case study on the application of the model is presented.

TL;DR: In this article, the relative magnitude and phase angles of power oscillation flow on transmission lines in the oscillation process were calculated for a power system and the contribution of each machine and each load in the system to oscillation f ow can be determined.

TL;DR: In this article, a post-optimality procedure which incorporates the philosophv and the method of Taguchi is applied to improve the quality of an OPF (optimal power flow solution including power demand uncertainty).

TL;DR: In this article, it was shown that for any disturbance the autonomous form of the nonlinear differential equation representing the system with two-degrees of freedom deca ys to a point attractor is always stable, however, exhibits the possibility of occurrence of a cyclic fold bifurcation which causes ferroresonant oscillations with two stable states to coexist.

TL;DR: In this article, the design of a discrete-mode variable structure power system stabilizer (VSPSS) has been presented, where the pole-shift factor and switching gains are obtained by applying an iterative Integral of Squared Error (ISE) algorithm.

TL;DR: In this article, the effect of load shedding and/or capacitor switching in the lower portion of the power-voltage (P-V) curve is shown to be different from what would be predicted from a steady-state analysis, and can be predicted correctly only by considering the pertinent load dynamics.

TL;DR: An ANN for topology determination and a supervised learning algorithm for very large training sets, the Optimal Estimate Training 2 (OET2), are introduced and overcomes the major shortcomings of the back-propagation learning rule.

TL;DR: Comparison between the two different methodologies, EP and EKF, is presented in the paper to show the potential of applications of the EP to parameter identification and system modelling.

TL;DR: Results obtained from simulation studies are presented to show a potential of applications of the interconnected learning automata with variable subsets of control actions to control of large-scale systems.

TL;DR: A better choice of input features and more appropriate training set selection procedure allow significant improvement in forecasting results comparing with the previous UL/SL concept characterized by a fixed neural-net structure and absence of re-training procedure.

TL;DR: In this article, an integrated approach to power system reliability assessment is presented, which unifies, classifies and extends some fundamental ideas and controversial issues which provide theoretical and practical support to these studies.

TL;DR: In this article, a systematic design method is presented for the control of FACTS (flexible AC transmission systems) components in multimachine power systems, where a set of linear state equations with the FACTS components as control variables and an output equation, which links the locally available signals with the system state variables, are derived.

TL;DR: In this paper, a detailed nonlinear dynamical model of a generator along with its excitation control and turbine governing system loop and motor loads have been considered and the hard limiters in the generator control loops have been modelled using a new approach in an analytic form and its load torque as nonlinear function of speed.

TL;DR: In this paper, a method of restoration in power systems is developed by using sensitivity analysis and heuristic rules are used in the plan to restore the blackout area that is recognized by the network topology and on/off status of switches (circuit breakers, line switches).

TL;DR: In this paper, an integrated voltage regulator and power system stabilizer based on one step ahead prediction is presented, which is capable of providing consistently good voltage response and contribution to system damping over a wide range of operating conditions and system configuration.

TL;DR: A simple, fast, efficient and reliable method for power system security assessment based on pattern recognition and fuzzy estimation techniques that is able to classify the system operating condition into secure/insecure state and for the insecure state it provides information about pertinent contingencies which may cause insecurity.

TL;DR: In this article, the pivotal role of the transmission grid in achieving high energy efficiency over interconnected power systems is discussed, and fundamental planning and operating questions of the, transmission grid as seen by the author.

TL;DR: In this paper, a method used for determining the number of equivalent π sections of the transmission line model according to the frequency range of interest and the model accuracy required is proposed.

TL;DR: In this article, an augmented power system stabilizer (PSS) is proposed which extends performance capabilities into the weak tie-line case, through its contribution at low frequencies, can also improve the damping of the interarea mode of oscillation and increase transmission system capability.

TL;DR: An overview of the systems theoretic framework for control of FACTS from the EMS is provided and along the way it points out the limitation of the current EMS software to exploit fully the capabilities of FACts.

TL;DR: In this article, the implications of FACTS technologies for the security and reliability of the AC transmission system and discusses how the new systems fits into the existing systems for control of the power system as a whole.

TL;DR: In this article, the voltage collapse phenomenon is discussed and a method that determines the distance to voltage collapse is proposed by using second-order eigenvalue sensitivity technique, which will also permit the determination of a minimum voltage level that can be estimated to track the status of the system as to how close and where voltage collapse might occur.

TL;DR: In this article, a research and development programme for the effective application of power electronics technologies to the bulk transmission network and interconnected power systems for the 21st century is presented, which includes three study projects: AC high-voltage/large-current transmission (feasibility study on enhancement measures for AC transmission capability, and verification test of their effectiveness using a power system simulator), multi-terminal HVDC transmission, and development and verification tests of a prototype control/protection device; high performance AC/DC converter (development of a partial model for a 300 MW self-

TL;DR: In this paper, the authors describe a new method which is reliable for this complex problem, fast and accurate in its evaluation of critical clearing time, provides an estimate of transient energy margin and has some potential for control evaluation.

TL;DR: In this article, a fundamental study of the small signal stability characteristics of a longitudinal system representing a major equivalent of the Mexican power system is presented and a number of studies regarding the nature and sources of low frequency oscillations are discussed.

TL;DR: In this paper, the authors proposed an approach to power system planning in Lebanon which is constrained by limits on available resources, incomplete information on the nature and distribution of system demand, and uncertainty about future growth.

TL;DR: In this article, a generalized approach to reactive power management in AC transmission lines for maximum power transfer limited by voltage stability is considered, where the transmission line is represented by its π-equivalent model.

TL;DR: The proposed algorithm has been tested on a system of up to 61 units to be scheduled over 24 hours and shows that this algorithm can obtain a satisfactory solution in 46.51 seconds on a VAX 11/750 computer.