Yazar "Savrun, Murat Mustafa" seçeneğine göre listele

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    A Fast Simulation Model for Large Scale Battery Packs Used in Heavy Electric Vehicles
    (Institute of Electrical and Electronics Engineers Inc., 2019) Erdogan, Birand; Savrun, Murat Mustafa; Koroglu, Tahsin; Cuma, Mehmet Ugras; Tumay, Mehmet
    Voltage imbalance occurs in a battery pack due to the differences of internal resistance, temperature, self discharge rate, leakage current etc. reduce the usable energy over time. To overcome voltage imbalances in the battery pack, cell balancing methodologies are used. Although passive balancing methods provide cheap solutions for equalizing imbalances, active balancing methods make it possible to balance faster. This paper presents an active balancing topology for large scale battery packs in a heavy electric vehicle. In order to investigate the performance of the system, a battery pack and bidirectional flyback converter (BiFLC) based active balancing circuit equipped with switch matrix (SwM) has been simulated by using MATLAB/Simulink. A charge transfer bus, which is supplied by the first cell of the battery pack, is used to transfer energy between the source/ destination cells. Thus, the need for the auxiliary circuit/battery is eliminated. A large scale battery pack consist of 176 series cells and 22 BiFLCs is used in the simulation model. Because of using switching models of BiFLCs requires high run time and more complexity, a simple model of BiFLC using current sources is presented. © 2019 IEEE.
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    A Novel Solid-State Transformer with Improved Flyback Converter Equipped with Quasi Z-Source Converter for Medium-Voltage Utility Grid
    (Mdpi, 2023) Cuma, Mehmet Ugras; Anvari, Alireze Deljavan; Savrun, Murat Mustafa
    This paper introduces an enhanced solid-state transformer topology for a medium-voltage (MV) utility grid. The main objective of the current study is to develop an improved flyback converter equipped with a quasi z-source converter (qZ_iFC) having a high-voltage conversion capability for the integration of low-input voltage to the DC link of an MV modular multilevel converter (MMC). The system integrates the quasi z-source and flyback converters by operating their existing switches complementary. Furthermore, the high-gain qZ_iFC allows for a reduction in the rated voltage of the input, as well as the use of a high-frequency transformer (HFT) with a unity turns ratio that provides galvanic isolation between the input and the output ports. Thus, using an HFT just for isolation purposes without voltage gain improves the system efficiency. In addition, a controller for (i) qZ_iFC which is regulating complementary switches to prevent the shoot-through current from reaching the HFT resulting in saturation; and (ii) a controller for MMC to produce MV-level AC voltage for loads are suggested. The performance of the proposed system was evaluated for several operating conditions. Results show that the proposed SST smoothly performs the power flow between the ports during steady-state and transient conditions. The power flow capabilities and efficiency values validate the viability and effectiveness of the proposed system.
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    A Review on Wind Power Forecasting Regarding Impacts on the System Operation, Technical Challenges, and Applications
    (Wiley-V C H Verlag Gmbh, 2022) Depci, Tolga; Inci, Mustafa; Savrun, Murat Mustafa; Buyuk, Mehmet
    Wind power forecasting's (WPF) technical improvements exhibit that the smooth forecasting of wind power is essential in executing operational management like energy balance, grid reliability, scheduling maintenance, and selection of site location for investment. However, there seems to be a lack of detailed work to guide researchers working on WPF applications and technical challenges. In the current study, a significant number of scientific studies have been reviewed and evaluated as references to help and guide researchers working in this field. Detailed content about the development of WPF, power system operation, and sectorial contributions are presented in this article. In power system operation, the operations like day-ahead operation and operation day are expressed in the event of WPF. The contributions and key factors of WPF in the energy sector are listed in trend technologies, employment, marketing, and power plants. Then, requirements and technical challenges affecting WPF are considered in terms of application requirements, regulatory requirements, atmospheric challenges, and operational difficulties. Subsequently, the process applications of WPF are handled to give detailed information for researchers and engineers working in WPF. Lastly, the applications like observing and tracking, technical planning, and investment issues are explained.
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    Adaptive neuro-fuzzy inference system combined with genetic algorithm to improve power extraction capability in fuel cell applications
    (Elsevier Sci Ltd, 2021) Savrun, Murat Mustafa; Inci, Mustafa
    This study introduces an improved ANFIS based MPPT method to maximize the power extraction capability of the FC-connected system. The proposed method is tested in a stand-alone system that consists of an FC in the power rating of 1.9 kW, a boost dc-dc converter, local consumer load, and processor unit. The energy transfer between FC and load is handled through the adjustment of a duty cycle of the dc-dc converter. In this context, the output voltage of FC is controlled by the duty cycle to track the MPP. The proposed method called GA-ANFIS computes optimum reference voltages to control the FC output voltage optimally. The GA-ANFIS uses a reduced-size training dataset extracted by GA to train the ANFIS in comparison with conventional ANFIS. Unlike the existing methods, the proposed method tracks the MPP by merely monitoring FC voltage during operation. Besides, it performs precise MPP tracking by considering pressure & temperature variations. Thus, the proposed method provides reduced computational load owing to its current features. The performance of the proposed method compared with the traditional methods like ANFIS and PI. The power extraction ratings and efficiency values validate the viability and effectiveness of the proposed method (>98%). (c) 2021 Elsevier Ltd. All reserved.
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    An improved and fast balancing algorithm for electric heavy commercial vehicles
    (Elsevier, 2021) Erdogan, Birand; Savrun, Murat Mustafa; Koroglu, Tahsin; Cuma, Mehmet Ugras; Tumay, Mehmet
    Nowadays, the tendency towards electric vehicles is increasing and various studies are being carried out in order to eliminate the shortage of battery life. One way to improve battery life is to overcome imbalances between cells in battery packs. The imbalances due to structural differences arising from production and changing operating conditions reduce the utilization of available energy. Passive and active balancing methods are used in order to eliminate these imbalances. Due to the slow equalization speed and energy inefficiency of passive balancing circuits, the trend towards active balancing is increasing. In this paper, an active balancing system with a new balancing algorithm that features fast balancing, multiple charge transfers, and suitable for large battery packs used in electric heavy commercial vehicles is proposed to increase usable energy. To test the algorithm, battery module and bidirectional dc-dc converter based active balancing system simulation study has been performed in Matlab-Simulink. The performance of proposed algorithm is compared with other algorithms and simulation results show that the proposed algorithm has better balancing performance.
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    Analysis and modeling of wireless power transfer supported by quadratic boost converter interfaced fuel cell power source
    (Wiley, 2022) Buyuk, Mehmet; Savrun, Murat Mustafa; Inci, Mustafa
    This study presents a novel wireless power transfer (WPT) system structure that transmits electrical energy from a fuel cell (FC) stack integrated with a quadratic boost converter (QBC). The main objective of the proposed study is to provide a high voltage conversion QBC based WPT system to transfer power from a low voltage FC energy unit. To adjust the power flow from the FC unit with nonlinear production behavior, a pre-regulating WPT system is developed with QBC located on the transmitting side. Besides, the design procedure of the system with analytical equations is expressed in detail. To validate the viability and effectiveness of the proposed WPT system, a 100 W proof-of-concept model is developed with Horizon H-100, and analyzed for different case studies, including dynamic operating and loading conditions. The constructed WPT system is performed for 80%, 90%, and 100% loading situations. At full loading, the performance results show that the load-side consumes power in the rating of 77.8 W while the FC power source generates approximately 93.1 W. In this case, the efficiency of the system corresponds to 83.6%. Besides, the efficiency of the complete system is analyzed under various operating conditions.
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    DA-DA Yükseltici Çeviricili Melez Birleştirilmiş Güç Kalitesi Düzenleyicisi Tasarımı ve Gerçekleştirilmesi
    (2016) Cuma, Mehmet Uğraş; Köroğlu, Tahsin; Demirdelen, Tuğçe; Tümay, Mehmet; Bayındır, Kamil Çağatay; İnci, Mustafa; Savrun, Murat Mustafa
    Dünyada ve ülkemizde, elektrik enerjisine olan talebin hızla artması ve gelişen teknoloji ile birlikte elektrik güç sistemlerine bağlı yük karakteristiklerindeki değişim elektrik güç kalitesi konusunun önem kazanmasına sebep olmaktadır. Elektrik güç sistemine bağlı ekipmanların ve son kullanıcı yüklerinin zarar görmesine veya yanlış çalışmasına sebep olan gerilimin veya akımın genliğindeki, frekansındaki ve dalga formundaki değişimler elektrik güç kalitesi problemleri olarak tanımlanmaktadır. Güç kalitesi problemlerinin kompanzasyonunda geleneksel kompanzasyon cihazlarının yetersiz kalması sonucunda ileri teknoloji güç elektroniği tabanlı kompanzasyon cihazlarının geliştirilmesine gereksinim duyulmuştur. Elektrik güç sistemlerinde karşılaşılan farklı güç kalitesi problemlerinin artmasıyla Dinamik Gerilim İyileştirici (DGİ)’nin ve paralel Aktif Güç Filtresi (AGF)’nin aynı DA bağına bağlanarak birleştirilmesiyle oluşturulan Birleşik Güç Kalitesi Düzenleyicisi (BGKD) geliştirilmiştir. BGKD; gerilim çukuru, gerilim tepesi, akım ve gerilim harmonikleri, akım ve gerilim dengesizlikleri, gerilim dalgalanması ve fliker gibi birçok güç kalitesi probleminin kompanzasyonunda ve reaktif güç kompanzasyonunda kullanılabilen gelişmiş bir sistemdir. Son yıllarda literatürde BGKD ile ilgili çalışmaların sayısı artmıştır ve çalışmalarda birçok farklı amaç için faklı BGKD topolojileri önerilmiştir. Bu topolojilerin içerisinde, DGİ’nin ve Paralel Melez Aktif Güç Filtresi (PMAGF)’nin aynı DA bağına bağlanarak birleştirilmesiyle oluşturulan Melez Birleşik Güç Kalitesi Düzenleyicisi (MBGKD)’nin, düşük maliyet ve etkin kompanzasyon özellikleri ile öne çıkması beklenmektedir. Bu projede, elektrik dağıtım sistemlerinde elektrik güç kalitesi problemlerine çözüm getirebilmek amacıyla yeni bir MBGKD topolojisi önerilmiştir. Önerilen MBGKD’ de DGİ’nin ve PMAGF’nin DA bağ bağlantısı çift yönlü izoleli DA-DA dönüştürücü ile gerçekleştirilmiştir. Önerilen MBGKD’ de, DGİ dengeli ve dengesiz gerilim çukuru ve gerilim tepesi kompanzasyonunu işlevlerini, PMAGF harmonik ve reaktif güç kompanzasyonu işlevlerini, çift yönlü izoleli DA-DA dönüştürücü ise gerilim çukuru/tepesi durumlarında çift yönlü güç transferini ve DGİ’nin DA bağ gerilimi sabit tutma işlevini gerçekleştirmektedir. Önerilen melez BGKD, sahip olduğu güç sistemi topolojisi ile literatürde ilk olmakla beraber bu topolojinin sağladığı yapısal ve işlevsel avantajlar ile literatürdeki BGKD topolojilerine göre birçok özgün yöne sahiptir
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    Design and analysis of a high energy efficient multi-port dc-dc converter interface for fuel cell/battery electric vehicle-to-home (V2H) system
    (Elsevier, 2022) Savrun, Murat Mustafa; Inci, Mustafa; Buyuk, Mehmet
    In this study, a novel interface topology called T-type isolated multi-port converter (T-iMPC) is proposed for integrating multi electric vehicles (EVs) with energy-consuming homes in DC microgrid. The proposed converter interface is purposed to use energy units of two different EVs for integration and supervise optimal energy flow between EVs and consumer homes. In the designed system, an FCEV and a BEV are implemented as energy units to manage electrical energy for the vehicle-to-home (V2H) concept. In this context, three energy flow modes are considered for the proposed system: (i) FCEV and BEV are suppliers, (ii) FCEV is supplier, BEV is consumer, and (iii) FCEV is the only supplier. In order to validate the efficacy of the converter operation, a control algorithm is developed to keep the output voltages at a balanced state. The proposed topology is examined under various case studies, including the dynamic load profile of homes for one day and different energy supply modes for FCEV/ BEV energy units. Besides, the proposed system is analyzed under various conditions. An assessment and comparison of efficiency involving existing topologies applied in V2H systems are also provided to show the benefits of the proposed converter interface for V2H system in different operating conditions.
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    Design and Analysis of a High-Efficiency Resonant Converter for EV Battery Charger
    (2023) Erdoğan, Birand; Tan, Adnan; Savrun, Murat Mustafa; Cuma, Mehmet Uğraş; Tümay, Mehmet
    The interest in electric vehicle (EVs) components such as battery, battery chargers, and battery management systems is increasing in parallel with the spread of electric vehicles. One of the most critical of these components is battery chargers. Battery chargers are equipped with DC-DC converters with high efficiency, low cost, and wide output voltage range. In order to provide reliable operation of the battery charger, it is of great importance that the DC-DC converters are operated with a robust and stable controller as well as designed optimally. In this paper, a design method for a CLLC resonant converter-based bidirectional dc-dc converter (BiDC) is presented for a battery charger. The resonant converter, whose design details are presented, suggests a resonant system to be used in battery chargers with fewer components than the CLLLC converter, and similar voltage gain characteristics for bidirectional power flow operations compared to the LLC converter. The design procedure highlights performing the soft switching operation and determining the resonant tank parameters. In addition, the forward mode and reverse mode gain equations required for the system to operate in the desired output voltage range have been presented. The design procedures have been validated with a CLLC BiDC model with ratings of 1 kW, 400 V input / 300-450 V output in the PSIM environment. The performance results reveal that the zero voltage switching (ZVS) has been performed for primary-side MOSFETs under a wide load range.
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    Design and analysis of fuel cell vehicle-to-grid (FCV2G) system with high voltage conversion interface for sustainable energy production
    (Elsevier, 2021) Inci, Mustafa; Buyuk, Mehmet; Savrun, Murat Mustafa; Demir, Mehmet Hakan
    This study proposes the more effective use of fuel cell (FC) vehicles by providing vehicle-to-grid (V2G) technologies that provide the integration of transportation and electricity networks. The main objective of the current study is to develop an FCV2G system with a high voltage conversion interface for the integration of low voltage FC energy units to utility-grids. To transfer the energy from the fuel cell vehicle (FCV) to the grid/homes with high efficiency, a single-switch high voltage conversion DC-DC converter is proposed, designed and implemented in the FCV2G system. The FCV2G with the proposed converter is analyzed for different operating modes in order to validate the smooth energy transfer with maximum power extraction capability. In the performance section, an FC in the rating of 20 kW (based on Pininfarina Sintesi model) is located in the energy generation unit of FCV2G, and a dynamic load profile is operated for 24 h period. The generated energy from FCV is supplied to consumer loads and electric grids in the rating of 220 Vrms/50 Hz. In the analysis section, during low load consumption, the FCV both meets the energy need of the load, and the excess energy is supplied into the grid. In cases where the homes? energy consumption is higher than the power rating produced by the FCV, the load absorbs the maximum power generated by the FCV and meets the power difference needing from the grid. In the designed model, FCV supplies a 44.06 kW h energy to consumer loads/grids per a day. After the system analysis, economic aspects are supported through energy and profit analysis of the FCV2G system. The results verify that the purchased price from grid-electricity significantly reduces to lower values for daily operation.
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    Design and implementation of algorithms for one pedal driving in electric buses
    (Elsevier - Division Reed Elsevier India Pvt Ltd, 2021) Cuma, Mehmet Ugras; Unal, Cagla Dericioglu; Savrun, Murat Mustafa
    Nowadays, the interest in electric vehicles (EVs) is increasing in parallel with falling prices of batteries, developing battery technology and willing to reduce carbon emissions. However, the most important problem of EVs is still range anxiety. The one pedal driving (OPD), which uses only accelerator pedal to accelerate and decelerate the vehicle, is an alternative solution to further increase the energy efficiency by managing the regenerative braking operation of EVs. In this study, OPD algorithms are developed for an electric bus (E-Bus), which is equipped with a 100 kW electric motor. Algorithms manage the vehicle traction torque without compromising the comfort of the passengers in the vehicle. To evaluate the performance of the developed OPD algorithms for the heavy vehicle, experimental studies have been conducted. The energy efficiency performance of OPD has been tested under different speed profiles as urban traffic, constant speed and stop-and-go traffic. The energy recovery potential of OPD algorithms for different experience levels and driving characteristics of drivers, the adaptability of drivers to OPD driving have been examined for heavy electric vehicles first time. The results show that the OPD performs a precise energy efficiency by managing the regenerative braking operation. (C) 2021 Karabuk University. Publishing services by Elsevier B.V.
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    Design and Implementation of Power Management Algorithm for Efficient Operation of Fishing Vessel With Battery Integrated Hybrid Shaft Generator/Motor System
    (IEEE-Inst Electrical Electronics Engineers Inc, 2024) Ozdamar, Hakkibaran; Savrun, Murat Mustafa
    In today's maritime industry, energy-efficient operations on ships are gradually increasing in parallel with the decrease in battery prices, advancements in battery technology, and the desire to reduce carbon emissions. Hybrid shaft generator/motor (SG/M) systems are an alternative solution to further enhance energy efficiency by capturing and utilizing the excess power. This study presents a new advanced power management algorithm for a marine vessel equipped with a hybrid SG/M, battery, and internal combustion main engine (ME), including the peak shaving function. With the proposed algorithm, peak shaving is performed for both the ME and the ac grid, minimizing the impact of operational load variations on the ME and eliminating the need for additional diesel generators (DGs) to cope with overload and short-term load increases, thus reducing fuel consumption. Experimental investigations are conducted on a fishing vessel to test the performance of the proposed algorithm. The peak shaving capabilities of the ME, ac grid, and direct current (dc) link control performances are examined under different loading cases. The power flow capabilities and oscillation values confirm the performance and effectiveness of the proposed system.
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    Design and Modelling of Three-Port Bidirectional DC-DC Converter for PV-Battery Integrated DC Microgrid Systems
    (IEEE Computer Society, 2024) Ayten, Kenan; Savrun, Murat Mustafa
    This paper proposes a novel non-isolated bidirectional three-port converter (TPC) based on a KY boost converter and an interleaved boost converter for photovoltaic (PV) powered and battery-buffered systems. The proposed three-port converter integrates ports of the PV array, battery pack and DC microgrid bus bar. Proposed converter is composed of two power switch, an LC filter for battery, boost inductor for PV array and KY boost converter, which is consist of a charge pump capacitor and two series switches. In the proposed converter, the charge pump capacitor and boost inductor provide a voltage gain, thus, the number of series battery cells and PV array can be reduced for a lower cost. On the other hand, a two-control loop scheme has been designed to control power flow between the ports and perform a smooth transition between the loops. To test the effectiveness of the proposed TPC, a MATLAB/Simulink-based simulation model has been developed with a 1 kW PV array, 37 V 10 Ah battery pack and 64 V DC microgrid. The performance of the proposed converter has been analyzed for different case studies and loading conditions. According to the simulation results, 96% peak efficiency of the converter has been achieved and maximum power from PV has been extracted with MPPT mode selection. The results show that the proposed converter has some advantages in terms of the number of switches, multi-loop control, bidirectional power flow, cost and efficiency. © 2024 IEEE.
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    DSP controlled voltage disturbance generator
    (Engineering & Scientific Research Groups, 2018) Savrun, Murat Mustafa; Tan, Adnan; Koroglu, Tahsin; Cuma, Mehmet Ugras; Bayindir, Kamil Cagatay; Tumay, Mehmet
    Voltage disturbance generator (VDG) is a kind of device used to generate voltage disturbances that may occur in the network in order to test and evaluate the performance of the power quality devices such as Dynamic Voltage Restorer (DVR) and Uninterruptible Power Supply (UPS). Some of the voltage disturbance generator systems which are available in the literature and commercially available are complex and expensive while the others are simple, inexpensive but less functional. In this paper, a new transformer based, digital signal processor (DSP) controlled VDG is designed which can generate balanced and unbalanced voltage sag/swell and interruption and can adjust the depth, duration and initiation point of disturbances. The proposed system is composed of bidirectional switches, variable transformers and DSP based controller. 3 phase 20 kVA experimental setup is developed to verify the performance of the designed system with linear and non-linear loads. Moreover, the performance of VDG is also investigated in the compensation tests of DVR and UPS.
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    DSP controlled voltage disturbance generator
    (Engineering and Scientific Research Groups, 2018) Savrun, Murat Mustafa; Tan, Adnan; Köroglu, Tahsin; Cuma, Mehmet Ugras; Bayindir, Kamil Çagatay; Tümay, Mehmet
    Voltage disturbance generator (VDG) is a kind of device used to generate voltage disturbances that may occur in the network in order to test and evaluate the performance of the power quality devices such as Dynamic Voltage Restorer (DVR) and Uninterruptible Power Supply (UPS). Some of the voltage disturbance generator systems which are available in the literature and commercially available are complex and expensive while the others are simple, inexpensive but less functional. In this paper, a new transformer based, digital signal processor (DSP) controlled VDG is designed which can generate balanced and unbalanced voltage sag/swell and interruption and can adjust the depth, duration and initiation point of disturbances. The proposed system is composed of bidirectional switches, variable transformers and DSP based controller. 3 phase 20 kVA experimental setup is developed to verify the performance of the designed system with linear and non-linear loads. Moreover, the performance of VDG is also investigated in the compensation tests of DVR and UPS. © JES 2018.
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    Feeding Electricity Ring Grids with Minimum Interruption Using Fuzzy Logic Based Relay Coordination Scenarios Under Interruption Conditions
    (2020) Cuma, Mehmet Uğraş; Demiray, İrfan; Savrun, Murat Mustafa
    In order to secure continuous and high quality supply of electricity, it is essential to protect end users’devices and network equipments against malfunction from production to consumption. Therefore, theprotection of electrical equipment is essential and one of the devices performing the protection task iscalled the protection relay.Industrial plants and large consumers that possess a high variation in loads and variable generationresulting from the widespread implementation of distributed generation requires the adaptive operation ofrelays in protection systems to prevent undesired malfunctions.In this study, a novel fuzzy logic based adaptive relay coordination strategy with the advantages ofreduced computational load and fast computing for distribution networks is proposed. In order to evaluatethe performance of the developed relay coordination strategy, a real-world sample line for a ring-typedistribution network has been simulated in PSCAD/EMTDC environment. The performance of theproposed system is validated with simulation results for different case studies.
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    Fotovoltaik Panel ve Batarya Entegre Sistemler için Yeni Bir Interleaved Tabanlı Çok Portlu İzole DA-DA Dönüştürücü Analizi
    (2021) Savrun, Murat Mustafa; Atay, Alihan
    Bu çalışmada, fotovoltaik (FV) panel ile çalışan ve batarya destekli sistemler için etkin bir kontrol yapısınasahip interleaved tabanlı çift yönlü çok portlu izole yeni bir DA-DA dönüştürücü önerilmektedir. Önerilendönüştürücü, üretim/depolama/yük birimleri arasındaki optimum güç akışını denetlemek için tasarlanmıştır.Tasarlanan sistemde, FV panel ve batarya arası güç transferi interleaved DA-DA dönüştürücünün sol kolanahtarlarının kontrolü ile sağlanırken, enerji üretim/depolama birimleri ile yükler arası güç transferi ilgilidevrenin sağ kol anahtarlarının kontrolü ile sağlanmaktadır. Yük tarafının izolasyonunu sağlayan yüksekfrekans transformatörünün (YFT) ikincil tarafında bulunan iki yarım köprü devresi ile birbirinden bağımsızkontrol edilebilen ve farklı gerilim seviyelerine sahip iki port oluşturulmaktadır. Önerilen dönüştürücüdeportlar arasındaki güç akışı kontrol döngüleri arasında yumuşak geçiş yapabilen çok döngülü bir kontrol şemasıtarafından gerçekleştirilmektedir. Önerilen çok portlu dönüştürücünün uygulanabilirliğini ve etkinliğinidoğrulamak için, PSIM programında simülasyon çalışmaları gerçekleştirilmiştir. Önerilen dönüştürücününperformansı farklı ışınım ve yüklenme durumları gibi dinamik koşullar altında analiz edilmiştir. Güç akışyetenekleri ve yüksek verimlilik değerleri (>%98) önerilen dönüştürücünün uygulanabilirliğini ve etkinliğinidoğrulamaktadır.
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    High Voltage Gain Multi-port Bidirectional DC-DC Converter with an Effective Multi-loop Control Strategy for PV/Battery Integrated Systems
    (2021) Savrun, Murat Mustafa; Atay, Alihan
    This study proposes a novel isolated bidirectional multiport converter (MPC) based on a switched-capacitor converter and a half-bridge converter with an effective control scheme for photovoltaic (PV) powered and battery buffered systems. The proposed power electronics converter interface integrates the converters to which the ports are connected with a battery coupled common dc busbar and high frequency transformer (HFT). Thus, the three-port converter is formed without any need for an additional converter to regulate battery power flow. In addition, to transfer power from a low voltage PV energy unit to the battery and load, a single switch DC-DC converter with high voltage gain is proposed. The power flow between the ports is controlled by an effective multi-loop control scheme that is able to perform a smooth transition between the loops. In order to validate the viability and effectiveness of the proposed MPC, a 3 kW proof-of-concept model has been developed with a 3 kW PV and 220 V 12 Ah battery. The performance of the proposed converter has been analyzed for different case studies, including dynamic operating and loading conditions.
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    High-Gain Multiport DC-DC Converter Topologies for Renewable Energy Applications: A Comprehensive Review
    (Taylor & Francis Inc, 2024) Disken, Nihal Bayramoglu; Savrun, Murat Mustafa
    Renewable energy sources have emerged as favorable alternatives for meeting ever-increasing global energy demand. To harness the maximum efficiency from renewable sources, dc-dc converters play a crucial role. While the design of dc-dc converters varies depending on specific application, certain features such as multiport capability and high gain are generally desirable. Multiport structures offer advantages such as compactness and cost reduction, allowing for the efficient integration of various energy sources, storage units, and loads. On the other hand, high gain characteristics enable the step-up of output voltages from renewable energy sources to usable levels. In recent years, numerous converter topologies proposed to address these requirements and enhance overall system performance. This study aims to assist and provide guidance to researchers in the field by reviewing and comparing the most recent advancements in the design and implementation of multiport high-gain dc-dc converters for renewable energy applications. Through a comprehensive analysis of the existing literature, the primary objective of this study is to facilitate knowledge transfer, identify research gaps, and inspire future research endeavors in this domain. By synthesizing the knowledge gained from these studies, researchers can contribute to ongoing advancement of multiport converter technology in the context of renewable energy applications.
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    Implementation of a Novel Hybrid UPQC Topology Endowed With an Isolated Bidirectional DC-DC Converter at DC link
    (IEEE-Inst Electrical Electronics Engineers Inc, 2020) Koroglu, Tahsin; Tan, Adnan; Savrun, Murat Mustafa; Cuma, Mehmet Ugras; Bayindir, Kamil Cagatay; Tumay, Mehmet
    This paper introduces an original hybrid unified power quality conditioner (HUPQC) topology as an alternative solution to electrical power quality problems. The proposed HUPQC consists of the shunt hybrid active power filter (SHAPF), the dynamic voltage restorer (DVR), and the isolated bidirectional dc-dc converter (BiDC) located at the common dc link. The SHAPF enables reduction in the voltage rating of the dc-link capacitor, helps to reduce the cost and the size of the dc link, and hence reduces switching losses of the voltage source inverter. Besides the novelty of its topology, dynamic reactive power compensation capability is realized for the first time in the literature within HUPQC concept by achieving adaptively controlling dc-link voltage. The BiDC not only provides isolation and bidirectional power flow between the DVR and the SHAPF but also operates to keep the dc-link voltage of DVR constant against adaptively changing dc-link voltage of the SHAPF. In addition to these, a new hybrid voltage sag/swell detection algorithm based on the combination of the improved Clarke transformation and the enhanced phase-locked loop is developed and introduced. In order to verify the viability and effectiveness of the proposed HUPQC topology, experimental studies are carried out.