Browsing by Subject "Electrical power system"

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    Optimizing reactive power flow of HVDC systems using genetic algorithm
    (2014) Kiliç U.; Ayan K.; Arifoǧlu U.
    Due to the usage of high voltage direct current (HVDC) transmission links extensively in recent years, it requires more studies in this issue. Two-terminal HVDC transmission link is one of most important elements in electrical power systems. Generally, the representation of HVDC link is simplified for optimal reactive power flow (ORPF) studies in power systems. ORPF problem of purely AC power systems is defined as minimization of power loss under equality and inequality constraints. Hence, ORPF problem of integrated AC-DC power systems is extended to incorporate HVDC links taking into consideration power transfer control characteristics. In this paper, this problem is solved by genetic algorithm (GA) that is an evolutionary-based heuristic algorithm for the first time. The proposed method is tested on the modified IEEE 14-bus test system, the modified IEEE 30-bus test system, and the modified New England 39-bus test system. The validity, the efficiency, and effectiveness of the proposed method are shown by comparing the obtained results with that reported in literature. Thus, the impact of DC transmission links on the whole power systems is shown. © 2013 Elsevier Ltd. All rights reserved.
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    Micro controller and computer based reactive power compensation; [Kompenzacija jalove snage zasnovana na mikro regulatoru i računalu]
    (Strojarski Facultet, 2017) Yilmaz E.N.; Aydin O.
    Reactive power compensation methods are one of the most effective methods to improve the efficiency of energy systems. Therefore, the designs and implementations of these systems are important. The aim of this study is to design and implement the most appropriate reactive power compensation systems in electrical power systems. Reactive power compensation can be realized using capacitors or the synchronous motors. In this study, a microcontroller and computer-controlled compensation applications are done by capacitors and synchronous motors under the same load conditions has been performed. By means of this designed system, it has been tried to determine what type of reactive power compensation is suitable in the existing system. In this respect, it is aimed to avoid unnecessary investments for existing systems and to establish a quality compensation system. In addition, the designed system is easy to update against all kinds of load changes and does not require additional equipment. © 2017, Strojarski Facultet. All rights reserved.