Scopus İndeksli Yayınlar Koleksiyonu
Permanent URI for this collectionhttps://hdl.handle.net/20.500.12573/395
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Article Citation - WoS: 376Citation - Scopus: 481Enhancing Smart Grid With Microgrids: Challenges and Opportunities(Pergamon-Elsevier Science Ltd, 2017-05) Yoldas, Yeliz; Onen, Ahmet; Muyeen, S. M.; Vasilakos, Athanasios V.; Alan, IrfanThe modern electric power systems are going through a revolutionary change because of increasing demand of electric power worldwide, developing political pressure and public awareness of reducing carbon emission, incorporating large scale renewable power penetration, and blending information and communication technologies with power system operation. These issues initiated in establishing microgrid concept which has gone through major development and changes in last decade, and recently got a boost in its growth after being blessed by smart grid technologies. The objective of this paper is to presents a detailed technical overview of microgrid and smart grid in light of present development and future trend. First, it discusses microgrid architecture and functions. Then, smart features are added to the microgrid to demonstrate the recent architecture of smart grid. Finally, existing technical challenges, communication features, policies and regulation, etc. are discussed from where the future smart grid architecture can be visualized.Article Citation - WoS: 10Citation - Scopus: 11A Multi-Functional Quasi-Single Stage Bi-Directional Charger Topology for Electric Vehicles(Elsevier, 2024-03) Tekgun, Burak; Tekgun, Didem; Alan, IrfanIn this paper, a multi-functional quasi-single stage, bi-directional electric vehicle charger topology is proposed to realize high efficiency power conversion in all AC/DC, DC/DC, and DC/AC forms. The proposed circuitry includes a noninverting buck boost converter (NBB) and an H-bridge inverter. The NBB converter generates the desired output voltage waveform in the rectified form then the inverter unfolds the waveform to the AC waveform. The advantages of this circuit are the reduced losses due to the high frequency switching only occurring at the NBB converter and passive element sizes are smaller leading to reduced losses and cost. The proposed charger is designed for 2 kVA rating and simulated for all vehicle, grid, and another vehicle interaction modes. Then the circuit is experimentally tested and is validated that the proposed circuit can operate in all three modes at a wide range of loading and power factor conditions with over 92% efficiency.