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Öğe Akıllı şebeke uygulamalarında kullanılan muhtelif enerji kaynaklarının doğru akım üzerinden güç entegrasyonu(İnönü Üniversitesi, 2015) Karabiber, AbdulkerimGelişen teknoloji ve artan enerji talebi, elektrik üretim ve tüketim alışkanlıklarını değiştirmektedir. Petrol ürünlerine dayalı merkezi üretim, artan enerji talebine cevap verememekte ve karbondioksit salınımının artmasına neden olmaktadır. Yenilenebilir enerji kaynakları, merkezi üretime alternatif olmakta ve doğası gereği her yerde kullanılabilmesi nedeniyle küresel ölçekte ilgi görmektedir. Yenilenebilir enerji kaynaklarının yaygınlaşması ve güvenilirliğinin artması mevcut şebekeye verimli şekilde entegre edilmeleriyle mümkündür. Bu tez çalışmasında, çeşitli güç ölçeklerinde bulunan dağıtık enerji kaynaklarının mevcut şebekeye entegrasyonu için kullanılan doğru akım güç entegrasyon yöntemi ele alınmaktadır. Doğru akım formunda üretim yapan YEK'lerin ağırlıklı olarak yer aldığı mikro şebekelerde hedef yöntemin kullanılması durumunda güç dönüşümlerinden kaynaklanan kayıplar azalacak ve güç sisteminin verimliliği artacaktır. Bu yöntemde, merkezi entegrasyon barasında toplanan enerjinin tek inverter üzerinden tüketici hattına verilmesi, mikro şebekenin kontrolünü kolaylaştırmakta ve frekans ve genlik ayarı için gerekli olan ek donanımlara ihtiyaç kalmamaktadır. Önerilen yöntemin kullanıldığı güç sistemlerinde elektronik cihaz gereksinimi azaldığından, maliyetler düşmekte ve güç kalitesi artmaktadır. Arıza ve ani yük değişimi gibi şebekenin kararlılığını olumsuz etkileyen durumlarda, önerilen yöntem, sistemin sağlıklı şekilde çalışmasını devam ettirmekte ve şebekede yaşanan bozucu etkilerden tüketiciyi korumaktadır. Üç farklı model üzerinden yapılan analizler sonucunda, doğru akım güç entegrasyon yönteminin akıllı şebekelerde yer alan muhtelif güç seviyelerinde verimli şekilde kullanılabileceği görülmektedir.Öğe An approach for the integration of renewable distributed generation in hybrid DC/AC microgrids(Pergamon-Elsevier Science Ltd, 2013) Karabiber, Abdulkerim; Keles, Cemal; Kaygusuz, Asim; Alagoz, B. BaykantThis paper presents an investigation of a hybrid DC/AC integration paradigm to establish microgrids (MGs) by using a conventional three-phase local power delivery system. This approach adds an additional DC power line to the local power distribution system in order to collect energy generated by distributed domestic renewable sources. The local renewable distributed generation (DG) works in conjunction with the conventional grid utility to reduce the power draw from the grid. Researchers designed an energy conversion station to mix energy from the local DGs with energy from the grid utility. This approach, therefore, uses a continuous energy mixing strategy for DC integration of local generation and grid energy to supply energy to MG consumers via the conventional three-phase power distribution system. Thus, local distributed renewable generators do not have to contend with AC integration problems, such as AC stability and line synchronization. This approach can facilitate the transformation of conventional local power distribution systems into reliable MGs in an affordable way for stakeholders and it is a step towards construction of future smart grids. (C) 2012 Elsevier Ltd. All rights reserved.Öğe Estimation, optimization and analysis based investigation of the energy consumption in machinability of ceramic-based metal matrix composite materials(Elsevier, 2022) Usca, Usame Ali; Sap, Serhat; Uzun, Mahir; Kuntoglu, Mustafa; Salur, Emin; Karabiber, Abdulkerim; Pimenov, Danil YuThe current study aims to determine the influence of machining and production parameters during the milling of Cu/B-CrC composites. The relationship between energy consumption and cutting speed, feed rate and reinforcement ratio were investigated. For this purpose, 2d and 3d graphs for comparison of the effects of input parameters were demonstrated and analyzed. The predictability of the energy consumption during milling was measured by a fuzzy inference system (FIS). According to the graphical and optimization results, the optimum conditions to obtain the minimum energy consumption were 5% reinforcement ratio, 125 m/min cutting speed and 0.2 mm/rev feed rate. A reinforcement ratio of 52.71% was the most effective factor on energy demand followed by the feed rate (24.26%) and cutting speed (12.85%). According to the obtained results, there was a minor margin of error between the actual and predicted findings ranging from 1.6 to 2.4%. Considering the energy consumption is one of the key factors among machinability criteria, the study proposes a comprehensive approach for industrial and academic works. (c) 2022 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).Öğe Opportunities for Energy Efficiency in Smart Cities(Ieee, 2016) Akcin, Murat; Kaygusuz, Asim; Karabiber, Abdulkerim; Alagoz, Serkan; Alagoz, Baris Baykant; Keles, CemalRapid migration from rural to urban areas leads to the emergence of urbanization and sustainability problems. Management and monitoring of resources and infrastructures are getting more important today in crowded cities. Energy consumption is increasing with the growing population and intensified in highly populated parts of cities. This increased energy consumption results in high energy demand as well as the production of more pollutants and heat in these city parts. The management of pollution and heat problems leads to an additional energy demand. Therefore, energy efficiency is becoming central challenge for urban life similar to energy efficient structuring of living organisms. Practically, all activities arranging city life require energy. For instance, job activities, transportation, security, climate, catering, entertainment, commerce etc. In this study, we review active and passive approaches, which can be utilized for improvement of energy efficiency and thus sustainability of urbanization in today's cities. We give a discussion to present a vision for future smart cities in term of improvement of energy utilization and efficiency, and relieve of environmental issues. These approaches can be helpful for future cities for relieving issues originating from population increase.Öğe Power Converters Modeling in Matlab/Simulink for Microgrid Simulations(Ieee, 2016) Karabiber, Abdulkerim; Keles, Cemal; Kaygusuz, Asim; Alagoz, Bans Baykant; Akcin, MuratSmart grid is a developing field for energy researchers. It offers technological improvements to have more controllable, reliable and sustainable power grids. Especially, the decreasing trend of fuels has pressurized to pay researchers' attention to renewable energy sources such as solar systems and wind turbines. The renewable energy sources generate electric power in different characteristics. Therefore, power converters are needed to integrate these sources in a grid to provide power flows among the sources and loads. This study presents Matlab/Simulink models of power converters and dynamic load structure, which are useful for smart grid simulations. These simulations can be used for research and educational purposes. Characteristic parameters of the models are suitable for existing devices. For power converters, Pulse-width Modulation technique is utilized that it is widely used in industry. The designed power converters and dynamic load models are tested in a microgrid application. The simulation results show that the designed power components are useful for smart grid simulation studies.Öğe Power regulated DC/DC driver design by hierarchical control(Tubıtak scıentıfıc & technıcal research councıl turkey, ataturk bulvarı no 221, kavaklıdere, ankara, 00000, turkey, 2016) Alagoz, Baris Baykant; Keles, Cemal; Kaygusuz, Asim; Kaplan, Yusuf; Karabiber, AbdulkerimAs a result of advances in solid-state power electronics, DC power distribution has found widespread usage due to its advantages. DC/DC converters, which are mainly used for voltage regulation, are fundamental components of DC power distribution systems. This paper presents a peak power controlled DC/DC converter design based on a two layer hierarchical closed-loop control strategy for active DC power management. The proposed DC/DC converter design, called a power regulated DC/DC driver, limits output power according to current-voltage characteristic of a modified sigmoid function and it allows more secure and controllable power delivery in DC distribution buses. As a design example, we illustrate use of these DC/DC drivers in an active power distribution management application for electric vehicles. The MATLAB/Simulink simulation environment was used for the design and simulation of the proposed DC power distribution system. Simulation results indicate that the active power distribution management system composed of the power regulated DC/DC driver nodes can allow more reliable power distribution for electric vehicles.Öğe Renewable energy integration for smart sites(Elsevier Science Sa, 2013) Kaygusuz, Asim; Keles, Cemal; Alagoz, Baris Baykant; Karabiber, AbdulkerimUse of distributed renewable energy sources for domestic energy consumption will increase in the near future, due to its advantages as being clean and infinite energy generation possibility. This trend allows more efficient energy consumption because of reducing transmission loses and dependence of domestic appliances to grid distribution. This study investigates potentials of a smart site concept based on domestic renewable energy generation. The study addresses site scale integration of hybrid renewable sources and grid energies as well as investigates possible advantages of the use of hybrid renewable energy systems based on solar and wind power. A continuous energy mixing strategy is used for DC integration of hybrid renewable energy (wind + solar) and the grid energy to meet site power demand. The proposed case study demonstrates that the smart site with hybrid renewable sources considerably reduces energy dependence of the house appliances to the grid which in turn presents a feasible solution for implementation of distributed generation provision for future smart grids. (C) 2013 Elsevier BM. All rights reserved.Öğe Sensitive battery charge control for supporting utility grid in peak demand times(Engineering & Scientific Research Groups, 2018) Karabiber, Abdulkerim; Kaygusuz, AsimThis paper presents a battery charge control scheme for grid-connected microgrids, which are composed of renewable energy sources and battery banks. The proposed charge control strategy primarily aims to support utility grid in peak demand times and safe charge management of battery groups. In addition, battery charge control is related to economic benefits by providing stored renewable energy during inefficient hours of renewable energy generation. We proposed an adaptive neural fuzzy inference system to manage battery charging process. This system charges batteries from renewable energy sources in peak off times of energy demand and discharges the stored energy to support utility grid in peak times. Two renewable energy generation scenarios are simulated in Matlab/Simulink simulation environment to demonstrate effectiveness of the proposed method. In these scenarios, the cases of 1 kW solar panel system and 1 kW wind turbine integrated a domestic microgrid are tested. The simulation results show that the controller can achieve to support utility grid in peak demand times with energy cost benefits and keep battery charge state in healthy working conditions.Öğe A smart building power management concept: Smart socket applications with DC distribution(Elsevier Sci Ltd, 2015) Keles, Cemal; Karabiber, Abdulkerim; Akcin, Murat; Kaygusuz, Asim; Alagoz, Bads Baykant; Gul, OzanRecent developments in power electronics increase DC bus utilization in electrical distribution systems due to its numerous advantages compared to AC distribution system in term of energy efficiency, safety, electromagnetic compatibility and renewable energy integration. This study presents a power management system concept based on domestic DC distribution with smart sockets for future smart houses. Energy efficient smart buildings are possible by integrating smart meter, smart sockets, domestic renewable energy generation and energy storage systems for integrated energy management, and this integrated system supports demand side load management, distributed generation and distributed storage provisions of future smart grids. Coming era of smart grids has implications for domestic DC distribution concepts with smarts sockets. Paper describes use of smart DC sockets as an integral part of building power management automation and presents a load shedding algorithm for plug load control for buildings. Simulations show performance of the proposed system components. (C) 2014 Elsevier Ltd. All rights reserved.
