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    Enhancement of a reduced order doubly fed induction generator model for wind farm transient stability analyses
    (Tubitak Scientific & Technical Research Council Turkey, 2016) Döşoğlu, Mehmet Kenan; Arsoy, Ayşen Basa
    Dynamic modeling of a doubly fed induction generator (DFIG) implemented for wind power systems is very important for transient stability. The rotor dynamic model (RDM) as well as the reduced order model (ROM) of a DFIG has been developed for transient analysis purpose. The performances of reduced order DFIG models with/without RDM have been compared. Modeling and analyses have been carried out in MATLAB/SIMULINK. Comparison of system behaviors against 3 phase fault is made between without RDM and with RDM. Several parameters such as output voltage, active power, speed, electrical torque variations, and d-q axis stator and rotor current variations of the DFIG along with a 34.5 kV bus voltage have been examined. In addition, the responses of DFIG output voltage and electrical torque have been compared for the cases of full order and reduced order DFIG models with rotor dynamics. It has been seen that the system becomes stable in a short time when the rotor dynamic is included in a reduced order DFIG model.
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    Investigation of transient stability of multi machine power systems with multiple UPFC
    (2011) Döşoğlu, Mehmet Kenan; Arsoy, Ayşen Basa
    This study examines the impact of multiple UPFC on transient stability of a power system. A real based multi machine-65 bus system is modeled and analyzed with Unified Power Flow Controller (UPFC). The placement of the compensators is determined based on the transmission lines with highest voltage drop in the system. Transient stability effects are analyzed for three system cases, one without compensators, one with one compensator at a time and the last one with multiple compensators. Angle, angular speed of rotors and voltage of each bus is observed. The simulation results showed that the system with multiple compensators can damp oscillations more effectively, which makes the system in a more reliable operation. © 2011 Chamber of Turkish Electric.
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    Investigation of various voltage sag analyses in wind farm through SVC
    (2011) Döşoğlu, Mehmet Kenan; Arsoy, Ayşen Basa
    In this study, the systems connect wind farm various voltage sag wind Farm DC link voltage, system buses voltage examined. For study of various transient stability 7.2 MVAr Static Var Compensator (SVC) is used. In the wind farm examined, 6 MW Double Feed Induction Generator (DFIG) is used. Also it examined 3 phase fault, induction motor, both 3 phase fault and induction motor together in wind farm. The results achieved have proved that SVC yield good results when used in terms of transient stability of the system., SVC was found to be effective and successful for eliminating instability in a very short period of time. © 2011 Chamber of Turkish Electric.