Cooperative diversity has been recently proposed as a way to form virtual antenna arrays that provide dramatic gains in slow fading wireless environments. However most of the proposed solutions require simultaneous relay transmissions at the same frequency bands, using distributed space-time coding algorithms. Careful design of distributed space-time coding for the relay channel, is usually bas...

Accurate models of Overcurrent (OC) with inverse time relay characteristics play an important role for coordination of power system protection schemes. This paper proposes a new method for modeling OC relays curves. The model is based on fuzzy logic and artificial neural networks. The feed forward multilayer perceptron neural network is used to calculate operating times of OC relays for various...

In this paper, the optimization of coordination of directional overcurrent relays in an interconnected power system is presented. The objective of protective relay coordination is to achieve selectivity without sacrificing sensitivity and quick fault clearance time. A methodology is adopted for the consideration of backup relays in the optimal coordination of directional overcurrent relays. The...

Abstract The main goal of this study is to propose new characteristics an REF 615 model (overcurrent and earth fault relay) that used for feeder protection in actual radial system Egyptian Substation. When studying current, both light heavy loads as well locations are considered based on the nature network. proposed algorithm relies simultaneously activating three settings OC relay, with being ...

1841 M. Zellagui & A.Y. Abdelaziz, Optimal Coordination of Directional Overcurrent Relays using Hybrid PSO-DE Algorithm  Abstract — This paper presents a new approach for the optimal coordination of IDMT directional overcurrent relays in meshed power systems using a hybrid particle swarm optimization based differential evolution algorithm (PSO-DE). In protection coordination problem the total ...

In this paper, a resource allocation algorithm is proposed for OFDMA relay networks with inter-cell interference coordination. Simulation results show the effectiveness of the proposed algorithm.

In electrical power systems, directional overcurrent relay (DOCR) coordination is assumed to be an essential component of the system for protection purposes. To diminish and reduce losses, between these relays ought kept at ideal value minimalize overall operating time all primary-relay shortcoming situations. The DOCR a complex profoundly compelling nonlinear problem. objective function total ...