Abstract
Voltage stability is concerned with the ability of a power system to maintain acceptable voltages at all busbars in the system under normal conditions, and after being subjected to a disturbance. A system enters a state of voltage instability when a disturbance causes a progressive and uncontrollable decline in voltage. In this paper it is studied and analysed the influence of the series capacitor compensation in the dynamic voltage stability assessment of an Electric Power System. It is used the BPA test power network considering different load models. A transmission line outage was simulated and different values of the series capacitor compensation were used to avoid voltage collapse. The automatic voltage regulators of the generating units and the turbine speed governors were modelled. The results were obtained using the software package EUROSTAG. Finally, some conclusions that provide a better understanding of the mechanism of the voltage collapse phenomenon that highlight the importance of the dynamic series compensation are pointed out.

Abstract

Abstract
This paper presents the implementation of an optical flow algorithm on a pipeline image processor The overall optical flow computation method is presented and evaluated on a common set of image sequences. Results are compared to other implementations according to two different error measures. Due to its deterministic architecture, this implementation achieves very low computation delays that allow it to operate at standard video frame-rate and resolutions. It compares favorably to recent implementations in parallel hardware.

Abstract
This paper presents the application of a CAN network to the integration of sensors and actuators in an unmanned airship called HELIX, based on the architecture of distributed processing proposed by [4]. Initially, a study of the viability of several communication networks used in vehicles (such as CAN, VAN, C2D and FIP, etc.) was accomplished [6]. The preliminary study concluded that the behavior of CAN was better for this application when compared to other types of networks analyzed. In the present work, a detailed study of the employability of a CAN network in the HELIX project was accomplished, including situations not considered in the preliminary analysis, such as the presence of Jitter in the group of messages, the high load of messages over the network, and the consideration of presence of transmission errors. As the CAN networks offers good properties for transmission of messages with temporal requirements, a schedulability analysis was accomplished for the transmission of messages and a numeric example is presented in an illustrative way to the present problem.

Abstract

Abstract
This paper provides an analysis of the real-time behaviour of the multi-master Profibus DP network. The analysis is based on the evaluation of the worst-case message response time and the results obtained are compared with those present in literature, pointing out its capability to perform a more accurate evaluation of the performance of the Profibus network. Copyright © 2002 IFAC.