Ahmet Aktaş

Gazi University · Department of Energy Systems Engineering

Refrigerated display cabinets, which are widely used in supermarkets, are one of the parts of the cold chain. These refrigerators are used for both cold storage and frozen storage of products at specific temperature ranges by standards. In refrigerated display cabinets, the air refrigerated by the heat drawn by the evaporator is blown to the food p...

Climate change and high energy demand have significantly increased the need for renewable energy sources (RES). Marine and ocean energy sources draw attention through their high energy potential. Offshore wind and marine current energy is an attractive RES with great potential. The wind and current energy in the marine produces an intermittent and...

Today, batteries are widely used in mobile devices, vehicles and military applications. Batteries meet the energy needs of the equipment on the vehicle in military vehicles which is one of the application areas. During the military vehicle is stationary, the vehicle engine must not work for camouflage. Therefore, it needs a battery charge circuit....

Thanks to the increased reliability and performance of power electronics, their use in military areas is very common. Through the developing technology, military land vehicles can have many equipment rather than just a replenishment and military transport duty. For safety and confidentiality, it is not possible to supply the energy of these equipme...

Wind and sea are renewable sources of energy with high energy potential. The sea/oceans have more than one type of energy such as wind, wave, tide, flow. The purpose of this work is to design a system that will convert multiple sources of energy into electricity. A platform with a high-potential hybrid power generation system model that utilizes wi...

Nowadays, with the development of ultra-wide band antennas and internet of thing technologies, tracing systems are being developed in many fields such as security, health, mining and transportation. The accuracy location estimation issue is becoming very important in areas of application where occupational health and safety are high. In these appli...

Nowadays, batteries used in many areas such as RES have an important place in energy storage. Because of the unstable and intermittent structure of RES, battery energy storage technology is becoming important. There are many different types of batteries in the market, such as lead-acid, nickel-metal hydride, and lithium-ion. It is very important th...

Energy storage technologies will become an important grid integration part of the renewable energy systems (RES) in near future. Using energy storage with RES is the best way of utilizing renewable power and reducing the conventional fossil fuel consumption. Sudden variation of load demand requires energy storage with high power density ability. Th...

In this paper, the control of a multi-function grid-connected photovoltaic (PV) 10 system with a three-phase three-level (3L) neutral point clamped (NPC) inverter is 11 proposed, which can perform shunt active filtering. Normally, the shunt active filtering is 12 achieved by detecting the harmonic and reactive currents of the non-linear load and th...

Renewable energy sources (RES) are becoming an important part of energy continuity for today’s electrical power grid, since RES are intermittent and unstable. Energy storage technologies are the only solution for this energy sustainability problem. In this study, a new Smart Energy Management Algorithm (SEMA) is proposed for Hybrid Energy Storage S...

Energy storage technologies (EST) will have an important position in combination of renewable energy sources (RES) in modern electrical power systems and smart grid. EST can provide more balancing and flexibility to the power system, providing incorporation of intermittent RES to the smart grid. Energy storage technologies have a critical function...

Otomotiv, sürekli gelişen ve yeni teknolojilerin kullanıldığı, ülke ekonomisinde büyük paya sahip bir sektördür. Otomotiv üreticileri, rekabet güçlerini arttırmak için maliyet ve iş gücü gereksinimini mümkün olduğunca azaltmalıdırlar. Araç üretim bantlarında otomasyon sistemlerinin kullanımının artması ile hem operatör hata oranın düşürülmesi hem d...

Özet—Bu çalışmada; akıllı şebeke ve dağıtık enerji kaynaklarının şebeke bağlantısı konularındaki IEEE standartları incelenmekte ve özetlenmektedir. Ayrıca geleceğin akıllı şebekelerinde yer alacak olan enerji depolama uygulamalarının önemi vurgulanmaktadır. Özellikle enerji depolama uygulamalarının talep tarafı yönetiminde sağlayabileceği faydalar...

Yenilenebilir enerji kaynaklarından enerji üretimi Türkiye ve dünyada hızla gelişim göstermektedir. Bununla beraber yenilenebilir enerji kaynaklarının sürekli dalgalı ve kesintili güç karakteristiği elektrik şebekemiz açısından birtakım sorunlar oluşturmaktadır. Bu sorunların aşılması ve yenilenebilir enerji kaynaklarından faydalanma oranının yükse...

Solar, wind and other renewable energy sources are becoming an important part of energy supply to the power grid. Integrating a Hybrid Energy Storage Systems (HESS) with renewable energy sources can make these intermittent renewable energy sources more dispatchable. The HESS will play a vital and large role in renewable energy based 3-phase 4-wire...

This paper presents a three-phase three-level neutral point clamped (NPC) inverter based single-stage grid-connected photovoltaic (PV) system with shunt active power filter (APF) functionality. The proposed system can perform both the maximum real power injection with the perturb and observe (P&O) maximum power point tracking (MPPT) algorithm from...

In this study, operation and performance of grid-connected solar photovoltaic (PV) power system installed in Kocaeli University are presented. The grid-connected PV power system consists of 720 Wp thin-film PV panels, a 1 kW grid-connected inverter and a WebBox for internet connection. The PV system has been installed first 360 Wp in March 2010 and...