Yazar "Yazar, Muhammed Duran" seçeneğine göre listele
Listeleniyor 1 - 7 / 7
Sayfa Başına Sonuç
Sıralama seçenekleri
Öğe Analysis of grid connected wind power system(Institute of Electrical and Electronics Engineers Inc., 2019) Bekiroğlu, Erdal; Yazar, Muhammed DuranThe importance of renewable energy sources has increased rapidly in recent years. Among these renewable energy sources, wind energy comes to leading due to its advantages such as clean, sustainable and cost-effective. Wind power energy source is an intermittent energy source. The power output can vary widely because of the random variables of wind speed. The wind turbine output is equal to wind speed's cube. The grid-connected wind power which includes many paralleled wind turbines, transformers and collection lines, will affect stability of the power system. In the present study, the grid-connected wind power system has been analyzed for 30 km, 120 km transmission lines where wind speeds are 6 m/s, 11 m/s, respectively. Simulation results and conclusions have been given for impact of wind speed and transmission line length on active power, reactive power, and power factor.Öğe Design and magnetic analysis of a grounding transformer compatible with wind power system(IEEE, 2023) Demiral, Elif; Bekiroğlu, Erdal; Yazar, Muhammed DuranThe aim of this study is to design and magnetic analysis of a grounding transformer in order to prevent material damage caused by phase-ground faults that may occur in wind energy systems. A zig-zag transformer is designed with a new winding design technique, different from the traditional zig-zag transformer design. Due to the lack of analytical formulas, finite element analysis (FEA) is used to calculate leakage reactance of designed transformer. The designed zig-zag transformer is analyzed in the ANSYS Maxwell environment. The proposed grounding transformer for wind power systems is investigated in terms of 3-phase 3D leakage reactance, 1-phase 3D leakage reactance, core losses of 3D, core losses of 2D, and flux density. The obtained results showed that the designed zig-zag transformer is compatible with wind power systems.Öğe Fault-ride through improvement of DFIG under symmetrical/asymmetrical voltage dips(Taylor & Francis Inc, 2023) Bekiroğlu, Erdal; Yazar, Muhammed DuranIn this study, improving fault-ride through capacity of the DFIG under symmetrical and asymmetrical voltage dips has been investigated. Initially, a crowbar protection circuit has been designed for the rotor side converter (RSC). With the help of the crowbar, the fault ride-through (FRT) ability of the wind energy conversion systems (WECS) has been increased, while the capacitors, rotor windings, and converters are protected from critical damage caused by the voltage dip. Then, the crowbar has been equipped with a fuzzy logic controller (FLC) to increase the FRT capacity. The switching time of the crowbar circuit has also been improved to protect the WECS from this serious damage. The suggested WECS has been designed and analyzed in Matlab/Simulink under symmetrical/asymmetrical voltage dips. DC bus voltage, electromagnetic torque, grid currents, crowbar current, and terminal voltage results of DFIG have been obtained. The simulation results of the DFIG have been compared. The results have also been contrasted with related studies. The obtained results demonstrated the robustness, applicability, and dependability of the suggested system.Öğe Improving fault ride through capability of DFIG with fuzzy logic controlled crowbar protection(Institute of Electrical and Electronics Engineers Inc., 2022) Bekiroğlu, Erdal; Yazar, Muhammed DuranDoubly fed induction generators (DFIG) are sensitive to intense disturbances in the grid. Various methods such as crowbar protection circuits are used to increase the fault ride-through (FRT) capability of DFIGs. Crowbar is one of the most important protection methods used to protect the rotor side converter, rotor windings, and capacitors in the wind energy conversion system (WECS) from the damage of overcurrent/overvoltage. Setting the timing of the crowbar switch excellently is significant for the stability of the grid and the efficiency of the WECS. In this study, a Fuzzy logic controller (FLC) block has been added to control the crowbar switch to improve the timing of the crowbar and improve the FRT capability of the WECS. The performance of DFIG-based WECS with FLC under symmetric voltage dip was investigated by using Matlab/Simulink environment at a constant wind speed of 12 m/s. DC bus voltage, crowbar current, the terminal voltage of DFIG, and electromagnetic torque results were obtained. The results of the crowbar with the proposed controller and the results of the crowbar without FLC were compared. The results revealed that the proposed system is reliable, proper, and prevailing for the grid-connected DFIG under grid fault conditions. © 2022 IEEE.Öğe MPPT control of grid connected DFIG at variable wind speed(MDPI, 2022) Bekiroğlu, Erdal; Yazar, Muhammed DuranIn this study, maximum power point tracking (MPPT) control of a grid-connected doubly fed induction generated (DFIG)-based wind energy conversion system (WECS) at variable wind speed was designed and analyzed. The real wind speed data of the Edremit/Balikesir region in Turkey was used as the wind speed profile. A N90/2.5 MW wind turbine model of Nordex Company was used in the study. Firstly, a conventional PI controller was applied to both rotor and grid side converters. The rotor-side converter (RSC) controls the power generated from the DFIG, whereas the grid-side converter (GSC) controls the DC bus voltage. An MPPT controller was applied to the RSC to generate reference torque at instant variable wind speeds. Thus, the system's response time, electromagnetic torque, generated power, and grid-side currents parameters were improved. In the MPPT controller, the reference torque value is produced by using the angular velocity and reference angular velocity values of the DFIG. The proposed system was modeled and simulated in Matlab/Simulink. Generated power, DC bus voltage, response time, electromagnetic torque, and grid side currents results were obtained. The results of the conventional PI controller and the results of the PI controller with MPPT were compared. The results of the proposed control were also compared with the related studies. The results showed that the proposed system is reliable, applicable, and valid for the grid-connected DFIG at variable wind speeds.Öğe Şebeke bağlantılı rüzgar enerji sisteminin modellenmesi ve analizi(Bolu Abant İzzet Baysal Üniversitesi, 2023) Yazar, Muhammed Duran; Bekiroğlu, ErdalBu tez çalışmasında, şebeke bağlantılı çift beslemeli asenkron jeneratör (ÇBAJ) tabanlı rüzgar enerji sistemi (RES) tasarlanmış, değişken rüzgar hızında performansı ve hata sonrası yeniden bağlanma (HSYB) kabiliyeti analiz edilmiştir. Öncelikle rotor tarafı dönüştürücüsüne (RTD) ve şebeke tarafı dönüştürücüsüne (ŞTD) PI denetleyici eklenerek sistemin değişken rüzgar hızındaki performansı incelenmiştir. Ardından RTD'ye maksimum güç noktası takibi (MGNT) denetleyici eklenerek sistemin performansı iyileştirilmiştir. Ayrıca tasarlanan sistemin şebekede meydana gelen simetrik ve asimetrik gerilim düşümleri sırasındaki HSYB kabiliyeti incelenmiştir. RTD'ye crowbar koruma devresi eklenerek, gerilim düşümünün neden olacağı aşırı akım ve aşırı gerilime karşı koruma sağlanmıştır. Crowbar koruma devresinin anahtarlama süresini iyileştirmek için bulanık mantık denetleyicisi (BMD) eklenmiştir. Bu sayede RES'in HSYB kabiliyeti iyileştirilmiştir. Rüzgar hız profili olarak Edremit/Balıkesir bölgesinin gerçek rüzgar verileri kullanılmıştır. Çalışmada türbin modeli olarak Nordex firmasının N90/2.5MW rüzgar türbin modelinin jeneratör parametreleri kullanılmıştır. Önerilen sistemin Matlab/Simulink ortamında gerçekleştirilen simülasyonlar sayesinde üretilen güç, DA bara gerilimi, tepki süresi, elektromanyetik tork, şebeke akımı, crowbar akımı ve terminal gerilimi değerleri elde edilmiştir. Benzer çalışmalarla karşılaştırıldığında önerilen şebeke bağlantılı ÇBAJ tabanlı RES'in değişken rüzgar hızındaki performansı ve HSYB kabiliyeti açısından geçerli, uygulanabilir ve güvenilir olduğu görülmüştür.Öğe Technical feasibility of offshore wind power plant for Gokceada region in Turkiye(IEEE, 2023) Akyol, Burak; Yazar, Muhammed Duran; Bekiroğlu, ErdalThe aim of this study is technical feasibility of the offshore wind power plant (OWPP) installation in Gokceada/Turkiye. First of all, the site selection process for OWPP has been executed. Then, the suitable wind turbine model for the wind speed profile of the region is determined. The layout of the turbines is made according to the main wind direction of the region. The designed system in the Homer PRO environment has been analyzed under actual wind speed. The ratio of the power produced by the system to meet the actual electricity demand of Canakkale and Turkish power system has been analyzed. In addition, the designed system is also analyzed under actual wind speed in the WindSim environment. Annual power generation, capacity factor, and full power generation time results are obtained. The applicability of the proposed system has been validated with the help of simulation environments. The obtained results showed that the OWPP in Gokceada/Turkiye is prevailing, reliable, and efficient.