Engin Ozdemir - Academia.edu (original) (raw)

Papers by Engin Ozdemir

Lethaia, 2020

In this study, design and implementation of a new cost-efficient daylight-based lighting control ... more In this study, design and implementation of a new cost-efficient daylight-based lighting control system is proposed to provide energy saving in a public building with a conventional lighting sys‐ tem. Energy gain recovery and regional daylight utilization coefficients are obtained by conducting daylight measurements in all indoor spaces of the building where the proposed lighting system will be applied. Daylight value is continuously trans‐ ferred to the control system through the pyranome‐ ter placed outside and the need for artificial lighting is calculated by using sectional daylight utilization coefficients. Thereby, maximum benefit from day‐ light is realized when unnecessary energy consump‐ tion for artificial lighting is reduced. Experimental measurement results show that the proposed day‐ light-based lighting control system provides an av‐ erage energy efficiency of the building at the level of 60 %. Additionally, the required investment, such as operating cost and payback p...

The biggest challenge with combining renewable energy into the electrical power system is the fac... more The biggest challenge with combining renewable energy into the electrical power system is the fact that the produced energy is intermittent. Solar energy is only available for usage when the sun is out and the sky is clear. A battery energy storage system (BESS) can solve this intermittency problem. The battery energy storage is necessary to help get a stable and reliable output from photovoltaic (PV) power generation system for loads and improve both steady and dynamic behaviors of the whole power system. Integrating the BESS with renewable energy sources can make the intermittent renewable energy sources more dispatchable. In this paper, modeling and analysis of the BESS for integrating intermittent renewable energy resources with energy storage for 3-phase 4-wire grid-connected electrical power systems is proposed. The BESS will play a vital role for integrating renewable energy into power system. Because renewable energy is not constant (aside from hydroelectricity) and is inter...

AHMET AKTAS, ENGIN OZDEMIR, ABDULHAKIM KARAKAYA, MEHMET UCAR Kocaeli University, Natural and Appl... more AHMET AKTAS, ENGIN OZDEMIR, ABDULHAKIM KARAKAYA, MEHMET UCAR Kocaeli University, Natural and Applied Science, Department of Energy Engineering, 41380, Umuttepe, Kocaeli Kocaeli University, Technology Faculty, Department of Energy Systems Engineering, 41380, Umuttepe, Kocaeli Kocaeli University, Technical Education Faculty, Electrical Education Department, 41380, Umuttepe, Kocaeli Duzce University, Duzce Vocational School, Electrical and Energy Department, 81010, Duzce

Conversion efficiency of DC/AC inverters depends on some parameters and fluctuates over the input... more Conversion efficiency of DC/AC inverters depends on some parameters and fluctuates over the input power of the inverter. Since the PV inverters operate under a fluctuating input power supplied by the PV modules, conversion efficiency must be measured against the weights of the probable power ranges which represent the various irradiation values. This approach of having different weights for different irradiation ranges resulted in two basic weighted conversion efficiency models of ηEURO and ηCEC. These two models consider the irradiation distribution over the whole annual sunny time and prioritize the ranges with various weight factors. Since the irradiation profiles vary around the planet, inverter efficiencies must be evaluated against local irradiation profiles to get more precise annual energy yield estimation. This paper presents ηİZMİR, a weighted conversion efficiency evaluation model, derived from the İzmir irradiation profile. This model has been developed in a way that it ...

Gazi Üniversitesi Fen Bilimleri Dergisi Part C: Tasarım ve Teknoloji

Gazi Üniversitesi Mühendislik-Mimarlık Fakültesi Dergisi

Renewable Energy and Power Quality Journal

TURKISH JOURNAL OF ELECTRICAL ENGINEERING & COMPUTER SCIENCES

TURKISH JOURNAL OF ELECTRICAL ENGINEERING & COMPUTER SCIENCES, 2015

Endüstriyel uygulamaların kaçınılmaz parçası olan otomasyon sistemlerinin önemi gün geçtikçe artm... more Endüstriyel uygulamaların kaçınılmaz parçası olan otomasyon sistemlerinin önemi gün geçtikçe artmaktadır. Bu doğrultuda gerek özel eğitim kurumlarının gerekse kamu eğitim kurumlarının otomasyon sistemleri üzerine verdikleri eğitimi, güncel ve teknolojik gelişmelere uygun hale getirmeleri gerekmektedir. Otomasyon sistemlerinde verilen eğitimin istenilen hedeflere ulaşmasına imkân sağlaması için, teorik bilgiler pratik uygulamalar ile desteklenmelidir. Bu bağlamda kullanılacak deney düzenekleri ekonomi, esneklik, geliştirilebilirlik ve güvenlik gibi noktalar göz önünde bulundurularak tasarlanmalıdır. Otomasyon sistemleri eğitiminde fiziksel deney düzeneklerinin kullanımı, sağladığı avantajların yanı sıra maliyet, güvenlik, çalışma ömrü vb. gibi dezavantajları da beraberinde getirmektedir. Bu dezavantajları ortadan kaldırabilmek adına fiziksel uygulamaların bilgisayar ortamında animasyon tabanlı olarak gerçekleştirilmesi bir çözüm yöntemidir. Bu çalışma kapsamında otomasyon sistemleri ...

2014 16th International Power Electronics and Motion Control Conference and Exposition, 2014

Measurement and Control, 2004

Ulaşım sektöründe yüksek paya sahip olan karayolu araçlarında temiz enerji kullanımına verilen ön... more Ulaşım sektöründe yüksek paya sahip olan karayolu araçlarında temiz enerji kullanımına verilen önem son yıllarda hızla artmaktadır. Günümüzde otomotiv sektörü zararlı emisyonları azaltarak, ekonomik, yüksek verimli hibrit ve elektrikli araçlar üretme eğilimindedir. Özellikle elektrikli araç üretimi ile zararlı emisyonlar sıfıra indirgenmektedir. Hem plug-in hibrit elektrikli araçların (PHEV) hem de elektrikli araçların (EV) kullanımı yaygınlaşmaya başladıkça, bu araçların elektriksel güç ihtiyaçlarının karşılanması için gereken şarj istasyonları kurulumu da hızla artmaktadır. Bu çalışmada elektrikli bir aracın şarj istasyonuna bağlı iken şebeke güç kalitesi üzerine etkisi deneysel olarak incelenmektedir.

IEEE Transactions on Industrial Electronics, 2000

This paper presents a new synchronous-reference- frame (SRF)-based control method to compensate p... more This paper presents a new synchronous-reference- frame (SRF)-based control method to compensate power-quality (PQ) problems through a three-phase four-wire unified PQ condi- tioner (UPQC) under unbalanced and distorted load conditions. The proposed UPQC system can improve the power quality at the point of common coupling on power distribution systems under unbalanced and distorted load conditions. The simulation results based on

Applied Thermal Engineering, 2004

Turkish Journal of Electrical Engineering and Computer Sciences, 2011

... Simulation and experimental results verified the validity of the generalized nonactive power ... more ... Simulation and experimental results verified the validity of the generalized nonactive power theory for the ... is not equal to the period of the line voltage [1,2]. The effects of nonperiodic ... the degradation of the power quality in distribution systems [2]. In addition, voltage sags are one ...