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    A Comparative Study on the Estimation of Wind Speed and Wind Power Density Using Statistical Distribution Approaches and Artificial Neural Network-Based Hybrid Techniques in Çanakkale, Türkiye
    (Mdpi, 2024) Koroglu, Tahsin; Ekici, Elanur
    In recent years, wind energy has become remarkably popular among renewable energy sources due to its low installation costs and easy maintenance. Having high energy potential is of great importance in the selection of regions where wind energy investments will be made. In this study, the wind power potential in canakkale Province, located in the northwest of Turkiye, is examined, and the wind speed is estimated using hourly and daily data over a one-year period. The data, including 12 different meteorological parameters, were taken from the Turkish State Meteorological Service. The two-parameter Weibull and Rayleigh distributions, which are the most widely preferred models in wind energy studies, are employed to estimate the wind power potential using hourly wind speed data. The graphical method is implemented to calculate the shape (k) and scale (c) parameters of the Weibull distribution function. Daily average wind speed estimation is performed with artificial neural network-genetic algorithm (ANN-GA) and ANN-particle swarm optimization (ANN-PSO) hybrid approaches. The proposed hybrid ANN-GA and ANN-PSO algorithms provide correlation coefficient values of 0.94839 and 0.94042, respectively, indicating that the predicted and measured wind speed values are notably close. Statistical error indices reveal that the ANN-GA model outperforms the ANN-PSO model.
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    An Isolated High-Power Bidirectional Five-Level NPC Dual Active Bridge DC-DC Converter with Anti-Windup PI Controller for Electric Vehicle-to-Home Application
    (Institute of Electrical and Electronics Engineers Inc., 2023) Ekici, Elanur; Koroglu, Tahsin; Celik, Dogan
    This paper introduces the design and analysis of an isolated bidirectional five-level (5L) neutral point clamped (NPC) dual active bridge DC-DC converter with an improved anti-windup strategy using proportional-integral (PI) controller for electric vehicle-to-home applications. The proposed converter is more advantageous in that it provides a 5L output voltage at the high-frequency isolation transformer sides thanks to its NPC structure compared to the conventional full-bridge circuit. Reducing switching stresses, providing galvanic isolation, ensuring bidirectional power flow and simple control strategy are the highlights of the proposed structure. A single phase shift (SPS) modulation strategy has been employed to regulate the output voltage and to generate switching signals of the proposed DC-DC converters' switches. To improve the dc-link voltage and to reduce the output voltage tracking errors, the anti-windup PI (PIAW) controller has been utilized instead of the conventional PI controller. To demonstrate the verification of the proposed converter and its controller, a simulation model has been developed in MATLAB/Simulink software. The performance and effectiveness of the proposed converter have been evaluated under steady-state and dynamic variations by the simulation results. © 2023 IEEE.
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    Öğe
    Design and analysis of two-stage bidirectional power converter for vehicle-to-grid technology with fuel cell-battery electric vehicle
    (Elsevier Ltd, 2025) Ekici, Elanur; Koroglu, Tahsin; Çelik, Özgür
    This paper presents the design and analysis of an isolated bidirectional two-stage power converter for vehicle-to-grid (V2G) technology with a fuel cell (FC) battery electric vehicle (FCBEV). In the first stage, the primary side employs a quadratic boost converter to achieve higher voltage levels, while the secondary side uses a voltage balancer circuit to equalize the DC subgrid terminal voltages. In the second stage, a T-type inverter is used for grid connection, effectively minimizing total harmonic distortion (THD). An Artificial Neural Network (ANN)-based maximum power point tracking technique combined with a Genetic Algorithm (GA) has been used to extract the maximum energy from the FC under changing temperature and pressure conditions in the system. The performance of the proposed converter has been evaluated and validated through simulation studies using MATLAB/Simulink software. The results demonstrate that the performance of the proposed converter is satisfactory under varying operating conditions. The grid current THD is maintained below 2.35 % in accordance with IEEE 519 standards. The proposed converter and control strategy facilitate the integration of EVs with renewable energy sources and bipolar hybrid AC/DC microgrids. © 2024 Elsevier Ltd
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    Öğe
    Five-Port Isolated Bidirectional DC-DC Converter for Interfacing a Hybrid Photovoltaic-Fuel Cell-Battery System with Bipolar DC Microgrids
    (Mdpi, 2024) Koroglu, Tahsin; Ekici, Elanur; Savrun, M. Mustafa
    This paper introduces a novel five-port, three-input, dual-output isolated bidirectional dc-dc converter (FPIBC) topology with an effective controller for power-sharing and voltage-balancing in bipolar dc microgrids (BPDCMGs). The proposed converter acts as the interface for the integration of a hybrid generation system comprising a solid oxide fuel cell (SOFC), a photovoltaic (PV) system, and a battery into BPDCMGs. It employs a reduced number of circuit elements compared with similar multiport converter topologies suggested for BPDCMG applications. Symmetrical bipolar output voltages are ensured by a voltage-balancing circuit composed of a fully controlled switch and four diodes. The FPIBC is equipped with different controllers for output voltage regulation and balancing, power sharing, maximum power point tracking of the PV, the optimum operating region of the SOFC, and constant-current, constant-voltage charging of the battery. To verify the viability and effectiveness of the proposed system, a simulation model was developed with a 4.2 kW SOFC, a 3.7 kW PV, and a 140 V 10.8 Ah battery in MATLAB/Simulink. The performance of the FPIBC was evaluated through extensive case studies with different operational modes, including battery charge/discharge states and SOFC and PV parameter changes under varying load conditions. In addition, the proposed system was examined using a daily dynamic load profile. According to the simulation results, a peak efficiency of 97.28% is achieved and the voltage imbalance between the output ports is maintained below 0.5%. It is shown that the FPIBC has advantages over previous converters in terms of the number of ports, number of circuit elements, bipolar output voltage, bidirectional power flow, and efficiency.
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    Modeling and Analysis of Five-Level Reduced Switch Inverter Based Bidirectional Isolated DC-DC Converter
    (Institute of Electrical and Electronics Engineers Inc., 2022) Ekici, Elanur; Koroglu, Tahsin
    This paper addresses the modeling and analysis of a new bidirectional isolated dc-dc converter (BIDC) based on a multilevel inverter topology. The novelty of the study is the utilization of the reduced switch five-level inverter topology instead of the conventional full-bridge dual active bridge. It has the advantage of lower voltage/current stress on the switches at higher voltages as compared to traditional BIDCs. Power transfer between primary and secondary sides is controlled by PI controller-based single phase shift (SPS) modulation technique. The proposed converter stands out for having: i) employing a reduced number of switches compared to other multilevel inverter-based bidirectional dc-dc converter topologies ii) high voltage gain iii) low harmonic level iv) suitable for integrating multiple input multiple output electrical systems and to be used in bipolar dc microgrid applications. In order to validate the performance of the proposed converter, a simulation model has been developed in Matlab/Simulink environment. The performance of the suggested converter and the controller scheme under steady-state and dynamic conditions have been revealed through the simulation results. © 2022 IEEE.
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    Öğe
    Modeling and analysis of five-port isolated bidirectional dc-dc converter for interfacing pv/fc/battery systems with bipolar dc microgrids
    (Adana Alparslan Türkeş Bilim ve Teknoloji Üniversitesi, 2022) Ekici, Elanur; Köroğlu, Tahsin; Savrun, Murat Mustafa
    Bu tezde, bipolar DA mikroşebekelerde güç paylaşımı ve gerilim dengelemesi için etkin bir kontrol sistemine sahip yeni bir beş portlu, üç girişli ve çift çıkışlı, izoleli çift yönlü DA-DA dönüştürücü topolojisi sunulmuştur. Önerilen dönüştürücü fotovoltaik sistem, yakıt hücresi ve bataryadan oluşan bir hibrit üretim sisteminin bipolar DA mikro şebekelere entegrasyonu için arayüz görevi üstlenmektedir. Beş portlu izoleli çift yönlü DA-DA dönüştürücü (FPIBC) iki tam köprü dönüştürücü, bir rezonans tankı, bir yüksek frekanslı transformatör (HFT) ve bir gerilim dengeleyici devresinden oluşur. Simetrik bipolar çıkış gerilimleri ek bir dönüştürücüye ihtiyaç duyulmadan bir anahtar ve dört diyottan oluşan gerilim dengeleyici devresi ile sağlanmıştır. Önerilen dönüştürücüde literatürdeki mevcut dönüştürücülere göre daha az sayıda devre elemanı kullanılmıştır. Bahsedilen dönüştürücünün etkinliğini ve kullanılabilirliğini doğrulamak için MATLAB/Simulink programı kullanılarak bir simülasyon modeli geliştirilmiştir. Önerilen dönüştürücünün performansını test etmek için değişen yakıt hücresi basıncı, güneş ışınımı, batarya şarj/deşarj durumu, yük değişimi ve gerilim dengesizliği koşulları altında farklı vaka çalışmaları gerçekleştirilmiştir. Sistemin performansı ve sağladığı verimlilik değerleri simülasyon sonuçları ile doğrulanmıştır. Simülasyon sonuçları, vaka çalışmalarına göre sistemin en az %91,13 verimliliğe sahip olduğunu, gerilim dengesizliğinin %1'in altında tutulduğunu ve çift yönlü güç aktarımı işlevinin başarıyla yerine getirildiğini ortaya koymuştur.