Yazar "Buyuk, Mehmet" seçeneğine göre listele

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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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    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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    Capacitor Current Feedback Active Damping for Shunt Active Power Filter with Output LLCL Filter
    (IEEE, 2017) Buyuk, Mehmet; Inci, Mustafa; Tan, Adnan; Tumay, Mehmet
    A high-order LLCL has excellent attenuation performance of ripple harmonics generated by VSI. The LLCL filter is especially effective at switching frequency to mitigate the switching ripple harmonics. However, like the other high-order filters, LLCL filter has resonance problem, which must be damped to have stable system. In literature, passive damping and active damping methods are proposed for grid-connected VSI. However, the active damping techniques have not been considered for SAPF with LLCL filter yet. Thus, in this paper, LLCL filter for Shunt Active Power Filter with Active Damping method is proposed and analyzed to suppress the resonance of LLCL filter and stabilize the control of SAPF.
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    Capacitor current feedback active damping for Shunt Active Power Filter with output LLCL filter
    (Institute of Electrical and Electronics Engineers Inc., 2017) Buyuk, Mehmet; Inci, Mustafa; Tan, Adnan; Tumay, Mehmet
    A high-order LLCL has excellent attenuation performance of ripple harmonics generated by VSI. The LLCL filter is especially effective at switching frequency to mitigate the switching ripple harmonics. However, like the other high-order filters, LLCL filter has resonance problem, which must be damped to have stable system. In literature, passive damping and active damping methods are proposed for grid-connected VSI. However, the active damping techniques have not been considered for SAPF with LLCL filter yet. Thus, in this paper, LLCL filter for Shunt Active Power Filter with Active Damping method is proposed and analyzed to suppress the resonance of LLCL filter and stabilize the control of SAPF. © 2017 EMO (Turkish Chamber of Electrical Enginners).
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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 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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    Improved adaptive notch filter-based active damping method for shunt active power filter with LCL-filter
    (Springer, 2018) Buyuk, Mehmet; Tan, Adnan; Tumay, Mehmet
    The LCL-filter has been recently used with grid-connected converters to mitigate switching ripple harmonics. The LCL-filter presents a better attenuation performance for switching ripple harmonics in comparison with L- and LC-type filters. However, the application of LCL-filter has two basic constraints on the circuit design and the resonance problem. These constraints can be effortlessly overcome for grid-connected converters which operate on the utility fundamental frequency. On the other hand, these constraints become a challenging issue when the LCL-filter is used with shunt active power filter (SAPF) because of the wide operation frequency bandwidth of SAPF. This wide operation bandwidth of SAPF causes a narrow bandwidth for the selection of LCL-filter cutoff frequency and the resonance damping control. In this paper, the application constraints of LCL-filter are discussed and the LCL-filter design is provided for SAPF. In addition, an adaptive notch filter-based single-loop active damping method is developed considering the wide operation bandwidth of SAPF. The proposed method consists of a grid impedance estimation algorithm in order to update notch filter parameters adaptively against grid impedance variations. By the help of the single-loop active damping strategy, the proposed controller does not require any additional sensor for the current measurement of LCL-filter capacitor to damp resonance currents. The stability analysis of proposed controller is performed through pole-zero maps. The proposed method is tested, and its performance is verified with comprehensive case studies of a 400-V 80-kVA SAPF simulation model through MATLAB/Simulink.
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    Mitigation of power oscillations for energy harvesting capability improvement of grid-connected renewable energy systems
    (Elsevier Science Sa, 2022) Celik, Ozgur; Buyuk, Mehmet; Tan, Adnan
    The increasing penetration of renewable energy sources in the power system raises several challenges from the power quality and output power fluctuations point of view. However, the output power oscillations and power quality problems caused by the low order harmonic oscillations at the second-order frequency of the utility grid on the dc-link capacitor are emerging as major issues for the efficient operation of power converters. In this manner, a novel method based on modification in the control algorithm to alleviate the output power oscillation and reduce the output current total harmonic distortion is proposed. The proposed control approach seems as a promising solution for the satisfactory grid operation of renewable energy sources regarding not requiring any additional circuit and increment in the capacity of the dc-link capacitor. Moreover, mitigation of oscillations enhances the active power reference tracking capability of the controller that enables the overall efficiency improvement of the system. The performed case studies reveal that the overall efficiency rate of the system is increased by 1.3%. On the other hand, the output current harmonic distortion is decreased below 3% even under low power operating conditions. Also, the complexity level of the control algorithm is quite low for real-time implementation.
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    MVT Controlled Voltage Restorer for Fault-Ride Through Capability
    (IEEE, 2017) Inci, Mustafa; Buyuk, Mehmet; Tan, Adnan; Bayindir, Kamil Cagatay; Tumay, Mehmet
    Voltage dips are the most harmful disturbances which may affect the voltage stability of wind turbines. In these voltage dip conditions, stator/rotor currents and electrical torque increase to fairly high values with failing of voltage stability. In order to provide voltage stability after the faults of voltage dips, the faults must be compensated fast and accurately. The main contribution in this study is that missing voltage technique (MVT) based controller method is tested in dynamic voltage restorer (DVR) to mprove fault ride through (FRT) capability in grid connected wind systems. The proposed method controlled DVR is performed for symmetrical and asymmetrical faults in grid connected wind energy systems by using PSCAD/EMDTC power system simulator program. The case studies demonstrate the superior and effective compensation results.
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    MVT controlled voltage restorer for fault-ride through capability
    (Institute of Electrical and Electronics Engineers Inc., 2017) Inci, Mustafa; Buyuk, Mehmet; Tan, Adnan; Bayindir, Kamil Cagatay; Tumay, Mehmet
    Voltage dips are the most harmful disturbances which may affect the voltage stability of wind turbines. In these voltage dip conditions, stator/rotor currents and electrical torque increase to fairly high values with failing of voltage stability. In order to provide voltage stability after the faults of voltage dips, the faults must be compensated fast and accurately. The main contribution iin this study is that missing voltage technique (MVT) based controller method is tested in dynamic voltage restorer (DVR) to mprove fault ride through (FRT) capability in grid connected wind systems. The proposed method controlled DVR is performed for symmetrical and asymmetrical faults in grid connected wind energy systems by using PSCAD/EMDTC power system simulator program. The case studies demonstrate the superior and effective compensation results. © 2017 EMO (Turkish Chamber of Electrical Enginners).
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    Sliding mode control for fuel cell supported battery charger in vehicle-to-vehicle interaction
    (Wiley-V C H Verlag Gmbh, 2022) Inci, Mustafa; Buyuk, Mehmet; Ozbek, Necdet Sinan
    In typical vehicle-to-vehicle (V2V) charging systems, energy transfer is provided from a battery electric vehicle (BEV) to charge the energy storage unit of another BEV. In this study, the utilization of a fuel cell electric vehicle (FCEV) as an energy provider is purposed to charge the energy storage unit of a BEV in V2V interaction. Since FCEVs are filled with hydrogen, it also eliminates the disadvantages of traditional BEV energy providers, such as a reduction in the amount of stored energy and the need for more time to charge fully. In the designed system, a new plug-in external V2V battery charger topology supported by an FCEV has been proposed to supply electrical energy. In order to control the energy transfer between electric vehicles (EVs), a sliding mode controller is adapted to manage the external converter interface located between vehicles. The designed controller shows improved robustness against the system dynamics uncertainties and disturbances generated by a variety of internal and external causes. In the designed section, a proton exchange membrane fuel cell with the maximum operational rating of 75 kW is used as an energy provider to feed consumer loads. The proposed system has been designed and analyzed for several loading situations from 20% to 100% loading and obtained performance results have been compared with a conventional controlled V2V battery charger system. The case studies validate that the proposed V2V charger system gives better results than the conventional controlled FC-supported V2V. The stability and robustness of output electrical waveforms are better for the designed system. In this context, the tracking error of the conventional controller is about 8% larger than that of the designed sliding mode control for dynamic load changes. The sliding mode controller has a faster settling time (approximately 0.12 s) in comparison with the conventional controlled V2V charger system. Also, mean absolute error values verify that the designed sliding mode controller operates smoothly under all cases except load transition compared to the typical control method. As a result, the case studies show that satisfactory results have been obtained for the designed system.