Browsing by Author "Ouahdi, D."

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Ant colony system for reliability optimization design problem of multi-state power system
(Institute of Thermomechanics AS CR, 2009) Bendjeghaba, O.; Ouahdi, D.
An approach in the improvement of the reliability of impedance relay
(2008) Ouahdi, D.; Ladjeroud, R.; Habi, I.
The distance protection mainly the impedance relay which is considered as the main protection for transmission lines can be subjected to impedance measurement error which is, mainly, due to the fault resistance and to the power fluctuation. Thus, the impedance relay may not operate for a short circuit at the far end of the protected line (case of the under reach) or operates for a fault beyond its protected zone (case of overreach). In this paper, an approach to fault detection by a distance protection, which distinguishes between the faulty conditions and the effect of overload operation mode, has been developed. This approach is based on the symmetrical components; mainly the negative sequence, and it is taking into account both the effect of fault resistance and the overload situation which both have an effect upon the reliability of the protection in terms of dependability for the former and security for the latter
Multi-agent ant system for redundancy allocation problem of multi states power system
(IEEE, 2008) Bendjeghaba, O.; Ouahdi, D.
This paper considers a redundancy allocation problem for a multi-state power system. This type of problems involves selection of components with multiple choices and redundancy levels that produce maximum benefits, subject to the system availability and demand constraints. The presented multi agent ant system finds the optimal system topology by choosing system elements from a list of available equipments. Each element is characterized by its productivity, availability and cost. The objective is to minimize the total investment costs while satisfying both system availability and demand constraints. The procedure based on the generalized Ushakov's technique is used for evaluation of the system availability. Illustrative examples demonstrate how to obtain the optimal structures of the power system for different system availability constraints
Redundancy allocation problem of multi state power systems using ant colony system
(2010) Bendjeghaba, O.; Ouahdi, D.
This paper considers the redundancy allocation problem (RAP) in which both the type of components and the corresponding number of redundancy of each component in each subsystem are to be decided simultaneously so as to minimize the system cost subject to reliability constraint. The problem has been studied in the literature for decades, usually using mathematical programming or heuristic/metaheuristic optimization approaches where they consider only the homogeneous redundancy. A metaheuristic approach based on the ant colony system combined with the universal moment generating function is presented for solving both the ordinary and the heterogeneous RAP. It can efficiently search to find the feasible optimal or near optimal solution. The obtained computational results using the approach, demonstrate that this one is a promising tool for solving this class of redundancy allocation problem especially at the design stage
Using the schunt active power filter for compensation of the distorted and umbalanced power system voltage
(2008) Habi, I.; Bouguerra, M.; Ouahdi, D.; Meglouli, H.
In this paper, we apply the PQ theory with shunt active power filter in an unbalanced and distorted power system voltage to compensate the perturbations generated by non linear load. The power factor is also improved in the current source. The PLL system is used to extract the fundamental component of the even sequence under conditions mentioned of the power system voltage