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    Analysis of Reduced Order Model Based on Doubly-Fed Induction Generators during Different Fault Times
    (Ieee, 2013) Döşoğlu, Mehmet Kenan; Arsoy, Aysen Basa
    In this study, three phase fault analysis of wind turbines consist of Doubly-Fed Induction Generators (DFIGs) has been examined. The dynamic analysis of DFIG has been conducted by Reduced Order Model (ROM). Three Phase fault has been made in 34.5 kV bus, happended in three bus power systems. The three phase fault time has been choosen as 0.02 second, 0.05 second and 0.1 seconds. 154 kV bus voltage, 34.5 kV bus voltage, DFIG output voltage, DFIG angular speed, DFIG electrical torque and DFIG d-q axes stator and rotor current variations of system in different fault times has been examined. According to the results, it has been seen that three phase fault is especially effective upon 34.5 kV bus voltage and DFIG output voltage in different fault time's analysis.
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    Application of STATCOM-supercapacitor for low-voltage ride-through capability in DFIG-based wind farm
    (Springer London Ltd, 2017) Döşoğlu, Mehmet Kenan; Arsoy, Aysen Basa; Güvenç, Uğur
    Low-voltage problem emerges in cases of symmetrical and asymmetrical fault in power systems. This problem can be solved out by ensuring low-voltage ride-through capability of wind power plants, through a static synchronous compensator (STATCOM). The purpose of this study is to reveal that the system can be recovered well by inserting a STATCOM with energy storage to a bus where a double-fed induction generator (DFIG)-based wind farm has been connected, so the bus voltage is maintained within desired limits during a fault. Moreover, a supercapacitor is used as an energy storage element. Modeling of the DFIG and STATCOM along with the nonlinear supercapacitor was carried out in a MATLAB/Simulink environment. The behaviors of the system under three- and two-phase faults have been compared with and without STATCOM-supercapacitor, by observing the parameters of DFIG output voltage, active power, speed, electrical torque variations, and d-q axis stator current variations. It was found that the system became stable in a short time when the STATCOM-supercapacitor was incorporated into the full-order modeled DFIG.
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    Modeling and simulation of static loads for wind power applications
    (Springer, 2014) Döşoğlu, Mehmet Kenan; Arsoy, Aysen Basa
    This study aims to model and simulate static nonlinear loads with wind power generation to evaluate the impact of load models on wind power systems. Nonlinear loads are modeled as exponential load model, ZIP load model and combination of exponential/ZIP with an induction motor. The wind power generator is represented with a reduced-order doubly fed induction generator (DFIG) model. Developed models have been implemented in a grid-integrated wind power plant and simulated in MATLAB/SIMULINK. The effects of nonlinear loads into wind power plant are investigated in terms of bus voltages, angular speed, electrical torque, and d-q stator axes currents. Additional analyses are conducted to compare the behaviors of full- and reduced-order DFIG models under a selected loading condition. The results of this study indicate that the response of a system with DFIG is dependent of the load modeling and reduced-order DFIG model shows more stable trend than full-order DFIG model.
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    Solution of economic dispatch problem using gravitational search algorithm
    (2011) Duman, Serhat; Arsoy, Aysen Basa; Yörükeren, Nuran
    An efficient and optimum economic operation of electric power generation systems has always played an important role in the operation of the electric power industry. Low fuel cost and reliable operation of power systems is desired the available electricity generation resources to supply the load demand on the power system. Economic dispatch problem is one of the nonlinear optimization problems of electrical power systems. This study presents a new heuristic approach to solve the well-known power system economic dispatch problem using Gravitational Search Algorithm (GSA). In order to test the effectiveness of proposed approach it was applied to different test systems. To show that effectiveness of proposed algorithm the results obtained are compared to those reported in the literature. The simulation results demonstrate that this proposed approach is a very useful and efficient approach to solve economic dispatch problem. © 2011 Chamber of Turkish Electric.
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    Transient modeling and analysis of a DFIG based wind farm with supercapacitor energy storage
    (Elsevier Sci Ltd, 2016) Döşoğlu, Mehmet Kenan; Arsoy, Aysen Basa
    Energy storage system (ESS) coupled to a wind generator has been recommended in improving the stability of the power system to which the wind farm is connected. ESS is particularly preferred in enhancing low voltage ride through (LVRT) capability owing to its fast charging and efficiency for high power applications. In the present study, a supercapacitor type ESS is used in transient state analysis of a grid connected wind turbine. The ESS consisting of a supercapacitor and a voltage buck-boost converter circuit is mathematically modeled in the grid side converter circuit of a doubly fed induction generator (DFIG) used as a wind generator. Moreover, reduced order model (ROM) for the DFIG is used in simulating stator dynamics. All modeling study has been carried out in MATLAB/SIMULINK environment. Three phase faults and having static loads for a short period of time are considered as transient cases. The effectiveness of the ESS on LVRT are shown by observing the responses of several system parameters. The study results show that utilizing a nonlinear supercapacitor type ESS in a ROM based DFIG removes oscillations in a short time during transient states, therefore enhances LVRT. (C) 2015 Elsevier Ltd. All rights reserved.