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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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    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.