Yazar "Yalcinoz, Tankut" seçeneğine göre listele

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    A dynamic model for solid oxide fuel cell system and analyzing of its performance for direct current and alternating current operation conditions
    (WILEY-BLACKWELL, 2013) Gelen, Ayetul; Yalcinoz, Tankut
    This paper presents a dynamic model of a solid oxide fuel cell (SOFC) and its performance test under direct current (DC) and alternating current (AC) operation conditions. The proposed fuel cell model involves all voltage losses, thermal dynamics and methanol reformer. SOFC model is developed on Matlab/Simulink environment. First, DC load following capability of proposed SOFC dynamic model is examined. Then, the SOFC dynamic model is connected to single-machine infinite bus through a transmission line. To connect the proposed SOFC dynamic model to AC bus, a basic power conditioner unit (PCU) is designed. A PCU, which consists of a DC-DC boost converter, a DC-AC inverter, their controller, transformer and filter, is designed. Finally, the proposed SOFC model is also simulated for an AC power system that has sinusoidal voltage of 400V, frequency of 50Hz and resistive load of 200W. The simulation results show that the proposed SOFC dynamic model has followed fairly DC load variations. Also, the output voltage of fuel cell system under maximum DC load conditions is obtained as 280V. The designed power conditioning unit is suitable for studying AC power system applications. Copyright (c) 2012 John Wiley & Sons, Ltd.
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    A multiobjective optimization method to environmental economic dispatch
    (ELSEVIER SCI LTD, 2007) Yalcinoz, Tankut; Koksoy, Onur
    An optimization technique based on progressive articulation of preference information is presented to solve the multiobjective environmental economic dispatch. For the multiobjective optimization problem, the use of weights to form a composite objective function reduces a multiple problem to a single problem. However, it also obviously "loses" some information in the conversion and this strategy is not expected to provide a robust solution or to even help trace the efficient frontier of solutions. Our main thrust is to facilitate a string of solutions of the problem without converting to the original problem to a simpler case. The proposed method handles the problem in an interactive way and does not need to know any global preference structure or some type of initial goals of the decision maker for the objectives. Numerical results for two case studies have been presented to illustrate the performance and applicability of the proposed method. The proposed method is compared with the genetic algorithm with arithmetic crossover and a neural network approach. (c) 2006 Elsevier Ltd. All rights reserved.
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    An educational software package for Thyristor Switched Reactive Power Compensators using Matlab/Simulink
    (ELSEVIER SCIENCE BV, 2010) Gelen, Ayetuel; Yalcinoz, Tankut
    In this paper, an educational software package called TSCOM (Thyristor Switched Reactive Power Compensators) has been developed. The TSCOM software package contains simulation models of Thyristor Switched Capacitor (TSC) and Thyristor Switched Reactor (TSR)based Static VAr Compensator (SVC) which are two of the shunt Flexible AC Transmission Systems (FACTS) devices. The design and simulations of TSC and TSR-based SVC are proposed using the Matlab/Simulink 7.04 (R) and SimPowersystems. The TSC and TSR-based SVC devices are demonstrated at two bus, three bus, infinite-bus, single-phase, three-phase, static load, dynamic load and stair-case load conditions. The effects of TSC and TSR-based SVC devices on load voltage are also analyzed. Student feedback indicates that this package is user-friendly and considerably effective for students and researchers to study theory of switched compensators, the reactive power control and voltage regulation. The proposed package will help to design the practical prototypes for students and researchers. (C) 2009 Elsevier B.V. All rights reserved.
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    Experimental Studies of a Scaled-Down TSC Prototype for Voltage Regulation and Compensation
    (PRAISE WORTHY PRIZE SRL, 2010) Gelen, Ayetuel; Yalcinoz, Tankut
    In this paper, a prototype of Thyristor Switched Capacitor (TSC), which is one of shunt Flexible AC Transmission Systems (FACTS) devices, has been developed The design and testing of TSC are verified in the Power Systems Research Laboratory at Nigde University. The TSC device is studied at two-bus, three-bus and single machine infinite bus (SMIB) systems for three-phase static load conditions. The effects of the TSC device on load voltages are also analyzed The experiment results show that significant improvement on reactive power compensation and voltage regulation is achieved by using TSC. Copyright (C) 2010 Praise Worthy Prize S.r.l. - All rights reserved.
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    Experimental studies of a scaled-down TSR-based SVC and TCR-based SVC prototype for voltage regulation and compensation
    (TUBITAK SCIENTIFIC & TECHNICAL RESEARCH COUNCIL TURKEY, 2010) Gelen, Ayetuel; Yalcinoz, Tankut
    In this paper, prototypes of two shunt flexible AC transmission system (FACTS) devices, a thyristor switched reactor (TSR)-based static VAr compensator (SVC) and a thyristor controlled reactor (TCR)-based static VAr compensator- have been developed. The design and testing of both a TSR-based SVC and a TCR-based SVC are accomplished in the Power Systems Research Laboratory of Nigde University. The TSR-based SVC and TCR-based SVC devices are studied in three-bus and single machine infinite bus systems for three-phase static load conditions. The effects of TSR-based SVC and TCR-based SVC devices on load voltages are also analyzed. Experimental results show that significant improvement in reactive power compensation and voltage regulation is achieved by using TSR-based SVC and TCR-based SVC.
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    PI CONTROL OF THYRISTOR SWITCHED CAPACITOR (TSC) AND THYRISTOR SWITCHED REACTOR-BASED STATIC VAr COMPENSATOR (TSR-BASED SVC)
    (GAZI UNIV, FAC ENGINEERING ARCHITECTURE, 2009) Gelen, Ayetuel; Yalcinoz, Tankut
    Together with the improvement in current and voltage handling capacities of power electronic devices, different type controllers have been increasingly used for efficient shunt and series compensation. The most promising controllers based on power electronics are known as Flexible AC Transmission Systems (FACTS) devices. In this study, the effects of two of shunt FACTS devices, which are Thyristor Switched Capacitor (TSC) and Thyristor Switched Reactor (TSR)-based Static VAr Compensator (SVC) on load bus voltage are investigated. Six Pulse Generator and PI Controller are used to control firing angles of TSC and TSR-based SVC. These compensators are simulated by using Matlab/Simulink, Power Systems Toolbox. Analyzed the studied three phase power system consists of two buses, a static load and a long transmission line model. The simulation results show that PI controller can be easily applicable to these type compensators.
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    Robust Design using Pareto type optimization: A genetic algorithm with arithmetic crossover
    (PERGAMON-ELSEVIER SCIENCE LTD, 2008) Koksoy, Onur; Yalcinoz, Tankut
    In dual response systems (DRSs) optimization restrictions on the secondary response may rule out better conditions, since an acceptable value for the secondary response is usually unknown. In fact, process conditions that result in a smaller standard deviation are often preferable. Recently, several authors stated that the standard deviation of any performance property could be treated as a new property in its own right as far as Pareto optimizer was concerned. By doing this, there will be many alternative solutions (i.e., the trade-offs between the mean and standard deviation responses) of the DRS problem and Pareto optimization can explore them all. Such analysis is useful, and that is required in order to achieve an improved understanding of the problem before searching for a final optimal solution. In this paper, we again follow this new philosophy and solve the DRS problem by using a genetic algorithm with arithmetic crossover. The genetic algorithm is applied to the printing process problem for improving the quality of a printing process. Genetic algorithms, in contrast to the one-solution-at-a-time approach of most optimization algorithms, maintain a population of hundreds, or thousands, of solutions in speedy manner. (C) 2007 Elsevier Ltd. All rights reserved.
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    THE BEHAVIOR OF THYRISTOR SWITCHED CAPACITOR (TSC) INSTALLED IN AN INFINITE BUS SYSTEM
    (IEEE, 2009) Gelen, Ayetuel; Yalcinoz, Tankut
    This paper examines the effects of Thyristor Switched Capacitor (TSC) on load voltage in a single-machine infinite bus (SMIB) system. The modeling and simulation of TSC are verified using the Matlab/Simulink 7.04@ and SimPowerSystems Blockset. The studied power system consists of a synchronous generator connected to an infinite bus and a static load. The results show that improvement on reactive power compensation and load bus voltage regulation could be achieved by using the TSC. Also, the test system with TSC is not needed a harmonic filter and low frequency voltage oscillations are damped by using TSC.
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    THE BEHAVIOUR OF TSR-BASED SVC AND TCR-BASED SVC INSTALLED IN AN INFINITE BUS SYSTEM
    (IEEE, 2008) Gelen, Ayetul; Yalcinoz, Tankut
    In this paper, effects of both Thyristor Switched Reactor-based Static VAr Compensator (TSR-based SVC) and Thyristor Controlled Reactor-based Static VAr Compensator (TCR-based SVC), which are two of shunt Flexible AC Transmission Systems (FACTS) devices, on load voltage in a single-machine infinite bus (SMIB) system are investigated. The modeling and simulation of TSR-based SVC and TCR-based SVC are verified using the Matlab7.04 (R) SimPowerSystems Blockset. A six-pulse generator is used to control of TSR in the SVC. A fuzzy logic controller is used to control of TCR-based SVC. The studied power system consists of a synchronous generator connected to an infinite bus and a static load. The results show that improvement on reactive power compensation and load bus voltage regulation could be achieved by using the TSR-based SVC and TCR-based SVC.
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    Transmission line shunt and series compensation with voltage sensitive loads
    (MANCHESTER UNIV PRESS, 2009) Eminoglu, Ulas; Hocaoglu, M. Hakan; Yalcinoz, Tankut
    This paper presents an analysis of the effects of shunt and series line compensation levels on the transmission line voltage profile, transferred power and transmission losses for different static load models. For this purpose, a simple model is developed to calculate the series and/or shunt compensated transmission line load voltage. Consequently, different shunt and series compensation levels are used with several voltage sensitive load models for two different line models. It is observed that the compensation level is significantly affected by the voltage sensitivities of loads. Moreover, the voltage level of the transmission is an important issue for the selection of the shunt and series capacitor sizes when load voltage dependency is used.