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This paper proposes Comparative Study between PI and sliding mode controllers in fault tolerant PMSM drive. The proposed drive is a three phase PMSM connected to four leg inverter when the fourth leg is always closed to the neutral point of the machine. The fault tolerance is reached by using a PI and Sliding mode controllers and a modified space vector modulation applied at post fault mode. The PI...
This paper presents a Sliding mode control applied to fault-tolerant PMSM drive system. It proposes a fast method of fault switches detection in the power converters. The considered drive is composed of three phase star-connected PMSM and a four leg three phases inverter when the fourth leg is permanently clamped to the neutral point of the machine. The fault tolerance is achieved by using the sliding...
In three-phase four-wire systems and unbalanced mode, the four-leg inverters have been considered as one of the adapted topologies of the power converters for the application which require a very strict and precise control of the neutral current, caused by the unbalanced and/or nonlinear load or unbalanced source. In this paper, we present a theoretical study of the control technique for this inverter...
Fault-tolerance is an important function in target tracking application using wireless sensor networks. We propose in this paper, an efficient fault-tolerant approach for target tracking that prevents the loss of the target. Instead of using a single prediction mechanism, our approach uses a multi-level incremental prediction technique that adjusts the prediction precision of the target movement....
We propose in this paper an efficient void-avoidance scheme based on a novel approach to prevent data packets from meeting boundaries of voids. In our approach, the choice of the forwarding region around a discovered void is based on the locations of the sender node, of the void center and of the destination node. The first stuck node which detects a void launches a void-discovery algorithm and communicates...
To avoid the negative impact of void areas on real-time routing efficiency, we propose in this paper an oriented void avoidance scheme for wireless sensor networks. To select the forwarding region around a void (either clockwise or anticlockwise), the proposed scheme is guided by the target location with respect to the center of the void. Our scheme uses the right-hand rule to discover boundary nodes...
Communication voids (i.e. holes) have negative impact on real-time routing protocols. To decrease both routing distance and energy consumption in large-scale sensor networks for real time applications, we propose in this paper a novel routing mechanism to make data packets avoid meeting voids in advance. After discovering boundary nodes of a void, our mechanism calculates and announces the center...
We have conducted a performance study of the DSR protocol, in particular, for scenarios where it presents poor performance compared to that of AODV protocol. We have also carried out two optimizations on DSR, namely: generalized salvaging mechanism and cache update of the intermediate nodes with source routes discovered during the route request packets propagation. Our routing protocol, called GSM-DSR...
Dynamic source routing (DSR) is a reactive routing protocol designed for mobile ad-hoc networks. It is based on two mechanisms including route discovery and route maintenance. In highly dynamic networks, the surplus use of expired routes in the cache of DSR increases the latency and the frequent diffusion of route request packets consumes bandwidth. Consequently, DSR presents handicap in terms of...
The fingerprint matching using the original FingerCode generation has proved its effectiveness but it suffers from some limitations such as the reference point localization and the recourse to the relative fingerprint pre-alignment stage. In this paper, we propose a new hybrid fingerprint matching technique based on minutiae texture maps according to their orientations. Therefore, rather than exploiting...
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