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Shammah A.A.E.,South Delta Electricity Distribution Company | Azmy A.M.,Tanta University | Abou El-Ela A.,Menoufia University
Journal of Electrical Systems | Year: 2013

This paper presents a proposed technique to solve the optimal placement and sizing problem of fixed capacitor banks in radial distribution systems in smart grid environment. The objective is to monitor and regulate the network voltage centrally, regarding the overall voltage profile in the power system for the online applications. Thus, it is essential to build a database that provides the optimal location and sizing of capacitor units for different loading conditions. This database can be used in a subsequently steps for online application using a heuristic algorithm as an optimization technique for fully-automated networks. A part of the Egyptian distribution network is used as a real test system to show the validity, capability and efficiency of the proposed technique. © JES 2013.


Sehiemy R.E.,Kafr El Sheikh University | El-Ela A.A.,Menoufia University | Shaheen A.,South Delta Electricity Distribution Company
IET Generation, Transmission and Distribution | Year: 2013

This study proposes a multi-objective fuzzy-based procedure for solving reactive power management in competitive environment. The proposed procedure incorporates both economical and technical aspects of reactive power support. The economical aspect aims to minimise the total costs of reactive power purchase from service providers as primary objective function, whereas the technical aspect is taken care of through the secondary objective function that minimises the total transmission losses. The proposed procedure achieves security constraints such as the bus voltage limits, reactive power capability limits and transmission line reactive transfer limits. The proposed procedure is applied to the west-delta region system as a part of the Egyptian Unified network. The numerical results show that the proposed procedure achieves a minimum real power loss with maximal reactive reserve for power systems for different operating conditions. © The Institution of Engineering and Technology 2013.


Kamel A.,South Delta Electricity Distribution Company | Alaam M.A.,Tanta University | Azmy A.M.,Tanta University | Abdelaziz A.Y.,Ain Shams University
Electric Power Components and Systems | Year: 2013

Coordination among protective devices in distribution systems is affected by inserting distributed generators. This is attributed to the changes in power flow in addition to the changes of magnitudes and directions of fault currents, which cause mis-coordination between protection devices. This article presents a new protection coordination to overcome the impacts of distributed generator units and to avoid the mis-coordination problem. The proposed protection coordination depends on activating the directional protection feature, which is available in most modern microprocessor-based reclosers. This will be accompanied by updating relays and recloser settings to achieve the correct coordination without extra costs or equipment in the distribution system when equipped with an autorecloser. A real 11-kV feeder, simulated by the ETAP package (ETAP, Irvine, California, USA), is used to prove the effectiveness of the proposed protection coordination. The results ensure the possibility of achieving proper coordination between protective devices after inserting distributed generator units if suitable settings of these devices are realized. © 2013 Copyright Taylor and Francis Group, LLC.


El-Sehiemy R.A.,Kafr El Sheikh University | El Ela A.A.A.,Menoufia University | Shaheen A.,South Delta Electricity Distribution Company
International Journal of Engineering Research in Africa | Year: 2015

This paper proposes a multi-objective fuzzy linear programming (MFLP) procedure for maximizing the effects of preventive reactive power control actions to overcome any emergency condition when they occurred. The proposed procedure is very significant and seeks to eliminate violation constraints and give an optimal reactive power reserve for multi-operating conditions. The proposed multi-objective functions are: minimizing the real transmission losses, maximizing the reactive power reserve at certain generator and maximizing the reactive power reserve at all generation systems and/or switchable devices. The proposed MFLP is applied to 5-bus test system and the West Delta region system as a part of the Egyptian Unified network. The numerical results show that the proposed MFLP technique achieves a minimum real power loss with maximal reactive reserve for power systems for different operating conditions. Copyright © 2015 Trans Tech Publications, Switzerland.

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