الفهرس 
Decentralized control systemOnly 14 pages are availabe for public view
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Abstract
Distribution system suffers from higher losses compared to transmission system due to high (R/X) ratio, which leads to higher voltage DROP in distribution feeders. Loss reduction represents major challenge facing distribution systems, for achieving good service to consumers. The most popular devices used for losses reduction in distribution systems are capacitor banks (CBs), distributed generators (DGs), if they optimally sized and sited. Automatic voltage regulators (AVRs) are important for enhancing the distribution systems performance especially for voltage DROP reduction. Combination between previous devices manages the distribution systems to achieve optimal (volt /var) and achieves more improvement compared with using each device individually. Also distribution systems have a problem of lack of monitoring and information exchange, which leads to increase outage and interruptions, this leads to reduce the reliability and availability of the distribution systems. Reachers pay attention to automation and converting traditional systems to smart grid by designing and constructing systems which have the ability to make self- healing, monitor and control of distribution systems in real time to improve the reliability and the performance of the distribution systems.
Firstly, this thesis introduces a new proposed technique for optimal allocation of capacitor banks (CBs), distributed generators (DGs) and automatic voltage regulators (AVRs) in distribution systems. The proposed technique gets the optimal coordination between the connected CBs, DGs and AVRs using a new combined rough set theory and particle swarm optimization (PSO) technique. The proposed technique can achieve the multi-objectives (the power loss minimization and the cost minimization) based-on a simplified non-dominating sorting algorithm. Also, a new modified direct approach power flow algorithm has been proposed for radial distribution systems embedded with AVRs which facilitates placement procedure and saves computation time. The previous proposed techniques succeeded in improving the performance of an old and heavily loaded real Egyptian distribution system.
Secondly, this thesis introduces performance improvement.