Showing papers in "Electric Power Systems Research in 2003"

TL;DR: In this paper, the effect of wind power on power system oscillations is investigated by gradually replacing the power generated by the synchronous generators in the system by power from either constant or variable speed wind turbines, while observing the movement of the eigenvalues through the complex plane.

TL;DR: The results demonstrate the capabilities of the proposed approach to generate true and well-distributed Pareto-optimal nondominated solutions of the multiobjective EED problem in one single run.

TL;DR: This paper reviews the progress made in electrical drive condition monitoring and diagnostic research and development in general and induction machine drive condition Monitoring and diagnosticResearch and development, in particular, since its inception and attempts are made to highlight the current and future issues involved for the development of automatic diagnostic process technology.

TL;DR: In this article, the authors investigate the impacts of doubly fed induction generators (DFIGs) on the operation and control of the power system and the capability of the DIG for voltage control and its performance during a network fault.

TL;DR: In this article, an algorithm is described that calculates the optimum dispatch of an electrical energy storage (EES) facility taking into account the short-term power exchange and the expected imbalance penalties of a wind farm.

TL;DR: In this paper, the authors introduce the terminology and various issues related to power quality, and explain the interest in power quality in the context of deregulation of the electricity industry, increased customer-demands, and the integration of renewable energy sources.

TL;DR: Numerical results show that EP-algorithm with better of Gaussian and Cauchy mutations was the best amongst all EPs in terms of convergence rate, solution time and success rate.

TL;DR: In this article, an improved Grey-based prediction algorithm is presented to forecast a very short-term electric power demand for the demand-control of electricity, which is able to provide an instrument to save operation costs for high energy consuming enterprises.

TL;DR: In this paper, a systematic and an intuitive approach to the analysis of voltage dips due to faults in three-phase systems is presented, based on the decomposition of the three phase voltages in symmetrical components.

TL;DR: Results of comparative study show much improvement of transient responses in terms of settling times, undershoots, overshoots and df/dt in favor of GA based gains for non-reheat systems, and to get better optimal performance GA based optimal gains have also been determined for three-area system.

TL;DR: In this paper, an overview of power-electronic based devices for mitigation of power quality phenomena is given, where the concept of custom power is highlighted and the authors focus on medium-voltage applications.

TL;DR: Signals obtained from the monitoring system are treated with different processing techniques with suitably modified algorithms to extract detailed information for machine health diagnosis.

TL;DR: In this article, a mathematical basis of the interharmonics and a few practical rules are proposed to assist the measurement of interharmonic components are provided to illustrate the difficulties in interharmopathy analysis.

TL;DR: In this paper, the authors studied the relationship between chaos and various power system instability modes and found that chaos is very likely to be an intergrade existing in the transient stage after a large disturbance.

TL;DR: In this paper, the authors focus on several major power quality problems, and some up-to-date signal processing techniques that may offer good solutions to the problems and future research directions are discussed.

TL;DR: In this paper, the modified grey model was applied to predict the oil-dissolved gas trend of power transformers and then, the future fault of power transformer can directly be identified by the trend analysis, so that we can switch them off safely and improve the reliability of power systems.

TL;DR: A fuzzy model and an evolutionary programming-based solution technique for the security-constrained maintenance scheduling (MS) problem of generation systems with uncertainties in the load and fuel and maintenance costs are presented.

TL;DR: In this paper, the authors introduced the concept of conjectural variation and its applications in electricity spot markets, where the conjecture of a firm is defined as its belief or expectation of how its rivals will react to the change of its output.

TL;DR: Results show that HES converges to better solutions by evaluating considerably less number of solution strings and even lesser number of load flow executions as compared to the other evolutionary algorithms reported.

TL;DR: In this paper, an electromagnetic finite element method is proposed to evaluate the losses generated in the conductors and in the steels, these are then used as the heat sources for thermal analysis.

TL;DR: Unlike the previously proposed detection methods, which are based on wavelet analysis that encounter mathematical calculations burden, Adaline is fast due to its simple construction, which makes it more suitable for on-line applications.

TL;DR: In this article, a simple and effective approach of scheduling thermal plants in coordination with fixed head hydro units is presented, which uses Hopfield neural network formulation to determine the optimal schedules of hydro and thermal power plants.

TL;DR: This paper describes a coordination process between GENCOs and the ISO for congestion management and reducing the risk of failure to supply loads using the security-constrained price-based unit commitment (SPUC) which is implemented in two stages.

TL;DR: Two new variable structure fuzzy control algorithms are presented for controlling the reactive component of the STATCOM current in a power system and can be varied widely by a suitable choice of membership functions and parameters in the rule base.

TL;DR: In this paper, a new approach to study the optimal reactive power (VAR) control problem using a modified interior point (MIP) method is presented, where a two-step procedure is employed: computing a unified ranking process for optimal reactive Power support sites using an analytic hierarchical process (AHP), and solving a optimal VAR control model for determining the values at the selected reactive power support sites.

TL;DR: In this paper, a sliding mode continuous controller is proposed to minimize the torque ripple of a switched reluctance motor (SRM), which is based on the control of the sum of the square of the phase currents by using only two current sensor and analog multipliers.

TL;DR: In this paper, the authors examined the problem of locating faults that may occur anywhere in multi-ring electrical distribution networks, which may affect the reliability of power distribution and developed a fault location method based on using artificial neural network techniques.

TL;DR: A novel cost allocation method for reactive power service based on power flow tracing that is reasonable and practical and based on the detailed formulation for the calculation of each part is derived.

TL;DR: In this article, a hybrid method employing finite element calculations along with Faraday's law and standard circuit analysis was proposed to calculate the induced voltages and currents on a pipeline with defects, running in parallel to a faulted line and remote earth.

TL;DR: In this paper, a new static state estimation algorithm using weighted least square (WLS) estimation, which is based on singular value decomposition (SVD) rather than the normal equations, is presented.