Yazar "Keles C." seçeneğine göre listele

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  • Küçük Resim Yok
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    Damping inter-area oscillations in power systems using a CDM-based PID controller
    (Universitatea Politehnica din Timisoara, 2014) Keles C.; Kaygusuz A.
    In this paper, controls of electro-mechanical inter-area oscillations between interconnected power regions are studied. If small amplitude oscillations with low-frequency in power systems do not damp as needed, these oscillations can cause instability of power systems by limiting the system's power transmission capacity. Many control methods have been applied to interconnected systems so far. In this study, a PID controller with derivative filter for damping the inter-area oscillations is designed by Coefficient Diagram Method (CDM) parameters. Time response performances of several previous control methods, such as the derivative filter PID controller, an optimization PID controller model that was developed using MATLAB/Simulink, and the controller designed using CDM are compared. Simulation results show that the CDM-based controller is more successful than the other controllers in damping the inter-area oscillations in power systems.
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    Frequency deviation indicators for estimation of energy balance state in smart AC grids
    (Institute of Electrical and Electronics Engineers Inc., 2016) Alagoz B.B.; Keles C.; Kaygusuz A.; Akcin M.
    Due to increasing intermittent renewable energy utilization in smart grids, smart management of energy balance is becoming major concern of research studies. In the case of highly volatile generation and demand conditions, it is very important to estimate instant energy balance state of electricity grid to preserve energy balance automatically and avoid from the cases of generation deficiency and overloading. The utility frequency deviation is commonly used to restore power imbalance in AC grids. This study gives a discussion on the utilization of frequency deviation of AC power system as an indicator of energy balance state in smart grids. We consider two approaches to estimate instant AC frequency deviation of power systems under serious harmonic and noise conditions. The first one is based on frequency to amplitude conversion technique, which use band-pass ramp filtering of AC signal. The other method is based on the sinusoidal to pulse waveform conversion, and it uses measurement of pulse periods of the resulting square waveforms. We compare these two methods and discuss their advantages and disadvantages to generate a balance error signal for smart grid applications. A brief discussion on application of these signals for smart grid energy management is given. © 2016 IEEE.
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    Monte Carlo simulation-based planning method for overload safe electrical power systems
    (Universitatea Politehnica din Timisoara, 2014) Kaygusuz A.; Alagoz B.B.; Akcin M.; Keles C.; Karabiber A.; Gul O.
    Operational reliability of power systems is one of the most important concerns that engineers have when planning a secure and economical electrical power system. This paper presents a probabilistic power flow analysis, based on the Monte Carlo simulation method, to support an overload safe power system designed to tolerate demand uncertainty and fluctuations of transmission parameters. Generation and transmission capacities in the power system can be estimated on the basis of operational risks and system installation costs. The proposed approach will be very useful for the rational planning of secure power distribution systems.
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    A photovoltaic system model for Matlab/Simulink simulations
    (2013) Keles C.; Alagoz B.B.; Akcin M.; Kaygusuz A.; Karabiber A.
    Solar energy maintains life on the earth and it is an infinite source of clean energy. There is an increasing trend for the use of solar cells in industry and domestic appliances because solar energy is expected to play significant role in future smart grids as a distributed renewable source. Optimal and large-scale integration of renewable sources into smart grid is possible by the aid of computer simulations and hence there is a growing demand for computer modeling and simulation of renewable sources. This study presents a generalized photovoltaic (PV) system simulation model for Matlab/Simulink simulation environment. The proposed model is based on a behavioral cell model for modeling solar radiance to electricity conversion and an electrical driver interface for implementing electrical characteristic of power limited systems in power simulations. The model is efficient in computational complexity and it is easy to configure for representing wide-range of PV installations. © 2013 IEEE.