Browsing by Author "Bekdikhan, Olcay Buğu"

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    Voltage stability analysis of grid connected wind farms : a case study in Trakya transmission system
    (Bahçeşehir Üniversitesi Fen Bilimleri Enstitüsü, 2014-08) Bekdikhan, Olcay Buğu; Tacer, Emin
    Alternative energy resources especially wind energy becomes popular in recent years because of decrement in fossil fuels and increasing energy demand. However, these sources cause some power quality problems when they are connected to grid. One of the most important problems is voltage stability. Nowadays, lots of studies are still continuing for solving this. In Turkey, with incentive of government, wind energy investments highly increase in last decade. However, studies about power quality problems of wind farms for Turkish electricity system are insufficient. In this thesis, voltage stability which is the most important power quality problem was investigated. Firstly, static and dynamic voltage stability analyzing methods were examined. Continuation power flow method for static voltage stability analysis was applied. Then, time domain simulations were investigated for dynamic analysis. In order to achieve all simulations, PSAT which is a MATLAB toolbox was used. Firstly, simulations were completed on IEEE 9 bus test system with and without a wind farm connection. Then, Trakya Transmission System was created in PSAT. Two cases were composed. One of them is the original Trakya Transmission System. In the second case, one conventional power plant is changed with a DFIG based wind farm. Maximum loadability limits of both cases were found with continuation power flow method. It was obtained that wind farm connection decrease the loadability limit. After this, fault ride through (FRT) capability of both cases were investigated with time domain simulations and it was found that wind farm connection increase the FRT capability of the system. Wind farms give better results after a three phase fault. Also, effects of FACTS devices were obtained with the dynamic analysis.