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    The effects on stability region of the fractional-order PI controller for one-area time-delayed load-frequency control systems
    (Sage Publications Ltd, 2017) Celik, Vedat; Ozdemir, Mahmut Temel; Bayrak, Gökay
    One of the controllers used in load-frequency control systems is the PI controller, taking account of time delay originating from measurement and communication. In control systems, along with the use of the fractional-order controller, computing parameter space exhibited stable behaviour on the controller parameters and analysing its efficiency have become a significant issue. This study focuses on computing the effects of the fractional integral order () on the stable parameter space for the control of a one-area delayed load-frequency control system in the case of a fractional-order PI controller. The effect of time delay on the stable parameter space is also investigated at different fractional integral orders () in the time-delayed system with fractional-order PI controller. For this purpose, a characteristic equation of the delayed system with the fractional-order PI controller is obtained, and the stable parameter spaces of the controller are computed according to the fractional integral order () and time delay () values using the stability boundary locus method, which is graphics based. Moreover, the generalized modified Mikhailov criterion is used for testing the stability region on the K-p-K-i plane. The obtained results verified that the stability region on the K-p-K-i plane change depending on the and .
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    A low-cost power management system design for residential hydrogen & solar energy based power plants
    (Pergamon-Elsevier Science Ltd, 2016) Bayrak, Zehra Ural; Bayrak, Gökay; Ozdemir, Mahmut Temel; Gencoglu, Muhsin Tunay; Cebeci, Mehmet
    This study focuses on developing a low-cost power management system for residential solar hydrogen power plants. The proposed power management system is designed as a hybrid control system consisting of a microcontroller and a Labview data acquisition card. Most of the controllers have some boundaries for power management, and providing a practical solution for hybrid power plants has some limitations. The proposed controller checks the total energy demand of the hybrid power plant in real time and operates the solar/hydrogen energy based power plant for the local load. The implemented electronic control card monitors the hybrid system and operates the related switches to select the proper energy source for the local load. The proposed real-time management system also provides a low-cost power management for the residential power plants, and the experimental results prove that the developed hybrid power management system is easy to implement and is suitable for residential applications. (C) 2016 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.