Yazar "Demirci, Alpaslan" seçeneğine göre listele

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    Decision-making between hybrid renewable energy configurations and grid extension in rural areas for different climate zones
    (Pergamon-Elsevier Science Ltd, 2023) Demirci, Alpaslan; Öztürk, Ali; Tercan, Said Mirza
    The growing population and technological developments have led to irregular houses and especially industrial facilities in developing cities. Furthermore, due to social and economic factors and the increasing massive migrations, undeveloped rural projects make irregular settlements worse. Thus, the expensiveness caused by the deterioration of the supply-demand balance makes establishment or production capacity increase of industrial facilities difficult. In this study, supplying the industrial urban facilities' demand with only grid or on-grid/offgrid HPS scenarios were investigated considering expanding and relocation outside the city. Twelve industrial cities in Turkey with various climates have been evaluated using Homer (R) Pro, considering the effects of RES potential on the techno-economic parameters. The results showed that the RES potentials changed break-even distance for grid extension between 0 and 25 km. Furthermore, it has been determined that the change in the discount rate and the grid extension costs, which vary depending on the regional geographical conditions, seriously manipulate break-even distance. Particularly, it can be extended up to 55 km depending on RES potentials and grid extension capital cost. In contrast, high RES potential make unnecessary grid extension, especially where the discount rate was less than 4%. Finally, sensitivity analyses are also presented in detail.
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    Determination of photovoltaic inverter ratio minimizing energy clipping for electric vehicle charging station under different solar radiations
    (Institute of Electrical and Electronics Engineers Inc., 2022) Demirci, Alpaslan; Öztürk, Zafer; Tercan, S.M.; Nakir, I.
    The increasing integration of electric vehicle charging stations (EVCS) with hybrid power systems (HPS) is becoming more important due to the growing population of electric vehicles. In particular, the decrease in solar module prices from HPS components more than other components (inverter, etc.) has needed the re-evaluation of the inverter loading rates (DC/AC ratio) in optimum system sizing. This study proposes the optimization of DC/AC ratios for EVCS installed in three regions with different climatic characteristics by considering the technical, economic, and environmental effects. The results showed that in optimal scenarios, the DC/AC ratio rose above 1.51 and increased to 1.66, especially for Samsun province, which has low solar potential. On the other hand, the clipping energy (CE) losses were determined to be up to 14% of the total annual energy production when DC/AC ratio is two. © 2022 IEEE.
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    Optimal planning of hybrid power systems under economic variables and different climatic regions: A case study of Türkiye
    (Pergamon-Elsevier Science Ltd, 2024) Ozturk, Zafer; Terkes, Musa; Demirci, Alpaslan
    Renewable energy-based hybrid power systems (HPS), proposed based on demand in the transition to clean energy-indexed societies, are high-potential investments. However, cost-based optimal sizing and feasibility analyses are complicated due to unforeseen variables and do not guarantee a reliable and robust optimization framework. This study optimizes minimum-cost HPS planning for diverse loads across varied climates and economic conditions, providing holistic comparisons of technical, financial, and environmental viability. According to the analysis, fluctuating economic structure emphasizes that unsubsidized hybrid power system installations are inefficient, the severe imbalance between inflation and interest rates limits the benefits of hybrid power systems and creates an uncertain investment environment for stakeholders. The gradual increase in interest rates to limit inflation has created a more viable renewable energy investment environment, while payback periods are reduced to 7.21 years. Even under identical economic conditions, the renewable fraction of energy in regions with high solar potential can be up to 25 % higher than in regions with less potential. Moreover, payback periods can vary up to 6 years, depending on the variability in solar generation and load profiles. Considering the significant impact of economic uncertainty on HPS investments, optimization plans that reduce investment risks will be helpful to stakeholders.
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    Optimal sizing and feasibility analysis of second-life battery energy storage systems for community microgrids considering carbon reduction
    (Elsevier Sci Ltd, 2023) Terkes, Musa; Ozturk, Zafer; Demirci, Alpaslan; Tercan, Said Mirza
    The rapid development of distributed renewable energy has made energy storage essential for efficient operation. However, energy storage is challenging for prosumers due to high investment costs and long payback periods. The second use of batteries has been evaluated as an alternative energy storage after the first service in electric vehicles with the remaining 80% capacity. This study investigates the feasibility of using secondary-use batteries as shared storage for prosumers. Financial and technical break-even points regarding the gradually increasing carbon limit on the way to 100% renewable have been determined. The proposed method's performance has been verified by conducting sensitivity analyses regarding various environmental and economic characteristics. The self-consumption rates have been achieved by 65.9% in Spain (Madrid) and 49.9% in England (London), and 48.5% in Turkiye (Antalya) without incentive. Increasing the carbon tax by 1 $/t for high and low energy tariffs can reduce carbon emissions by 181.3 and 1607 kg/yr. The optimum sizes remain until the carbon tax threshold is 60 $/tCO2eq for high energy tariffs. After 60 $/tCO2eq, it is tended to enlarge the hybrid power system. However, severe carbon emission restriction for zero carbon targets prevents the optimum system design since the carbon reduction cost increases to 232.7-304.8 $/kg. This study encourages investors and prosumers to plan the shared energy storage system sensibly and guides governments to develop realistic incentive mechanisms to implement second-life batteries effectively.
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    Optimization of Renewable Energy Hybrid Power Systems Under Different Penetration and Grid Tariffs
    (Gazi Univ, 2023) Ozturk, Zafer; Demirci, Alpaslan
    The trend towards renewable energy sources (RES) is increasing daily due to energy demand, costs, and environmental concerns. This study investigates the technical, economic, and environmental impacts of changes in energy costs and incentives on hybrid power systems (HPS). Optimization results show optimal HPSs vary between 75-200% penetration (PR) depending on grid energy tariffs and energy sales constraints (GSC). In these scenarios, the renewable fraction (RF) increased to 80%, while the excess electricity (EE) increased to 10%. On the other hand, energy tariffs and grid constraints limit the PR increase in the optimal scenarios. This reduced the RF by up to 26%, limiting the use of clean energy. Due to load mismatch and grid constraints, there was a minimal increase in RF after 200% PR. In addition, removing incentives increased the cost of energy (COE) and total net present costs (NPC) by up to 96%. The results show that grid constraints and energy tariffs directly affect the economic and environmental performance of renewable energy investments and can slow down the pace of these investments. Moreover, it has become clear that controlled incentive packages must continue to achieve zero carbon targets.
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    Technic and Economic Effects of Changes in the Location of Industrial Facilities in Industrializing Regions on Power Systems
    (Institute of Electrical and Electronics Engineers Inc., 2021) Öztürk, Zafer; Demirci, Alpaslan; Tosun, Salih; Öztürk, Ali
    The installations of new facilities innercity cause regional and infrastructural problems for the industry. On the other hand, establishing new facilities outside the city requires an expensive grid extension. In this study, the proposed hybrid power system (HPS) models were analyzed to meet the energy demand of the dispersed industrial facilities out of cities. In addition, sensitivity analyses were made by considering the distance to the national grid (DNG) and the discount rate (DR) changes of the region where industrial facilities will establish. Micropower optimization program HOMER (NREL, US) was used to simulate the system. As a result of the analyzes, it has been determined that on-grid systems are more economical if the distance between the national electricity grid and the energy demand is assumed to be less than 125 km. Furthermore, it has been that the DR change creates a gray region between the break-even points define for on/off-grid systems (125 km= HPS = 175 km). Likewise, it was determined by a sensitivity analysis that grid extension capital cost (GECC) and DR increases reduce the break-even distance (BED) up to 50 km and that off-grid HPSs are more economical after 100 km. According to the results obtained, the study has the quality of guiding the investors about the optimal system set up in the light of technical and economic parameters. © 2021 Chamber of Turkish Electrical Engineers.
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    Technical, Economic and Environmental Optimization of Electric Vehicle Charging Stations Integrated Photovoltaic Panel and Energy Storage with Different Climatic Characteristics
    (Duzce University, 2023) Demirci, Alpaslan; Öztürk, Zafer
    The increasing population in the world, the rapid development of technology, and the modern lifestyle leading society to more consumption increase the energy demand. Meeting the demand for energy widely from conventional sources creates many environmental and economic problems, especially global warming. Moreover, energy consumption devices' low efficiency and dependence on traditional resources further complicate the situation. Therefore, it is essential to electrify internal combustion vehicles, which have approximately 20% of fossil-based energy consumption, and to meet their energy demands with renewable energy systems (RES). In this study, the integration potential of electric vehicle (EV) charge stations with solar photovoltaic panels (PV) and energy storage systems (ESS) was investigated, and their technical, economic, and environmental effects were optimized. In addition, the effects of the proposed model in geographical regions with different climatic characteristics were determined by sensitivity analysis. The results showed that unit energy costs increased up to 21% due to climatic differences, and the best result was obtained in the province of Izmir with $0.046/kWh. ESSs used to reduce the clipped energy and increase clean energy consumption have caused the depreciation process to approach project life in cities with low solar radiation potential. On the other hand, the amortization period in hybrid models with PV decreased to 7.88 years. The results showed that PV-ESS-integrated EV charge stations might have different technical, economic, and environmental effects depending on the region's climatic characteristics. Developing infrastructure and investor incentive mechanisms is necessary by considering these situations.
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    Technical-environmental-economic evaluation of biomass-based hybrid power system with energy storage for rural electrification
    (Pergamon-Elsevier Science Ltd, 2022) Demirci, Alpaslan; Akar, Onur; Öztürk, Ali
    In recent years, higher penetrations of renewable energy generations helped persuade sustainable energy and environmental targets, although their intermittent and fluctuated nature raised technical challenges. However, hybrid power system can minimize these technical issues by integrating flexible generation capable renewable energy sources like biomass. This study deals with optimizing gridintegrated and stand-alone biomass-based hybrid power system for the energy demand of a rural region containing poultry farms. Besides solar and wind energy, energy storage integration is evaluated regarding overall technical-environmental-economic performance, considering the actual manure potential using HOMER Pro. In addition, sensitivity analyses are performed, considering the estimated load and inflations using an artificial neural network method. Using biomass and solar hybrid options offers more autonomous, environmentally friendly, and economic advantages. Biomass-based hybrid power system with solar energy reduced net present cost by around 12% and increased renewable fraction by 7%, and grid-connected options can provide 88.9% renewable fraction. In addition, the energy storage integration increased renewable fraction by around 10% and reduced excess energy by 16%. The proposed biomass-based hybrid power system achieves cost-effective sizing of solar or wind-based hybrid systems, empowers the reliability of renewable energy and presents good consistency of decarbonization targets.