Abstract
In this paper we present a Monte Carlo based application to evaluate estimates of nodal marginal prices leading to target prices of transmission congestion contracts. The application integrates an optimization model to evaluate nodal marginal prices for each sampled state including an estimate of transmission losses. This formulation is integrated in a Monte Carlo simulation in order to deal with the probabilistic nature of component outages and to allow the user to represent load behavior using Load Duration Curves. The computational performance of the Monte Carlo simulation is enhanced by adopting a variance reduction acceleration technique based on a regression function. At a final section the paper includes results from a case study to illustrate the application of the model and to evaluate the efficiency of the referred acceleration technique. © 2001 IEEE.

Abstract
This paper presents a review of the state of the art on Intelligent Transportation Systems. ITS involves a large number of research areas and, therefore, this paper focus on those we believe to be the most relevant. The main purpose is to study the achievements attained in the last years and to give an overview of possible directions towards future research. © 2001 EUCA.

Abstract
This paper presents a review of the state of the art on Intelligent Transportation Systems. ITS involves a large number of research areas and, therefore, this paper focus on those we believe to be the most relevant. The main purpose is to study the achievements attained in the last years and to give an overview of possible directions towards future research.

Abstract

Abstract
In this paper a combined Monte Carlo-Hybrid Transient Stability approach for the dynamic security analysis of a multimachine power system is proposed. This approach evaluates a probabilistic measure of the transient stability, instead of just a particular response to a specified disturbance. Due to the large number of simulations required, the application of a hybrid method to assess transient stability reduces drastically the computing time. A probabilistic version of the software package TRANsySTEM, developed by the authors to study the transient security of a multimachine system, was applied to a test power network. During the simulation time, the occurrence of disturbances and the subsequent protective actions are assumed as a stochastic process. Finally, the obtained results are discussed and some conclusions that provide a valuable contribution to the understanding of the system dynamics are pointed out. © 2001 IEEE.

Abstract
In this paper it is simulated the effect of the circuit breakers reclosure in the transient stability of an electric power system using a new hybrid approach. This efficient and robust formulation combines both a time domain integration scheme to compute the initial system trajectory with the equal area criterion to obtain the transient stability margins and the critical clearing times, In this hybrid approach it is used a stop criterion to provide automatic and early termination of the simulations as soon as post-fault (un)stability are detected. The early termination algorithm assess the transient stability of the multimachine power network based on the concept of the dot products from the potential energy boundary surface method. The computer programs developed by the authors were applied to a multimachine test power network. The results obtained with this new hybrid formulation were compared with the solutions produced by a time domain simulation program. Finally, some conclusions that provide a valuable contribution to the understanding of the auto-reclosing effect in the transient stability problem are pointed out.