Yazar "Aktas, Ahmet" seçeneğine göre listele

Listeleniyor 1 - 3 / 3
  • Küçük Resim Yok
    Öğe
    The Assessment of Wind and Sea Flow Energy Production from Seas by Using Energy Storage Unit
    (Ieee, 2018) Sener, Arif Senol; Aktas, Ahmet; Kircicek, Yagmur
    The sea/ocean energy is a source of renewable energy sources with high energy potential in the nature. There is more than one kind of energy in the sea/ocean, and these are wind, wave, tide, flow energy. The aim of this work is to design a system that will turn multiple energy sources into electricity. Utilizing the wind and surface flow energy in offshore, a platform with a high potential hybrid power generation system model was created. In order to ensure the durability of these intermittent and unstable energy types that are inherent in renewable energy sources, a hybrid energy storage unit which are composed from battery and ultra-capacitor has been implemented to the proposed hybrid power generation system to provide the optimum solution for meeting the demand side and producing high quality electricity. In this study, all units were simulated using the hybrid power generation system and the hybrid energy storage system MATLAB/Simulink program. The hybrid power generation system and the hybrid energy storage system transfer a single-phase inverter with a single DC bus. The smart energy management algorithm in the system provides control of direct current converter and inverter circuits take into account on all power values. In this study, current, voltage and power graphical results are given by examining the dynamic behavior of possible working states of the total system. By taking the results of Case 1 from the probable working states of the system, it helps to see fast and predictable results of the simulation studies before the experimental studies.
  • Küçük Resim Yok
    Öğe
    MODELLING AND VALIDATION ANALYSIS ACCORDING TO TEMPERATURE EFFECT OF DIFFERENT TYPE BATTERIES
    (Vinca Inst Nuclear Sci, 2020) Aktas, Ahmet; Kircicek, Yagmur; Ozkaymak, Mehmet
    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 that these batteries are well recognized and controlled accordingly to extend their cycle life. In this study, necessary parameter values were obtained by conducting lead acid, nickel-metal hydride and lithium-ion charge-discharge experiments by using climatic chamber in the laboratory environment. A single model was created using curve fitting for three Offerent battery types. In addition the electrical model of the batteries, the temperature model was also combined to conduct state analyzes at different operating temperatures of the batteries and a mathematical model was derived. The obtained mathematical model MATLABAI-File program was used to compare with the experimental results. In this paper, electrical and thermal mathematical equations for different types of batteries are compared with experimental and model results and the accuracy ratios are given.
  • Küçük Resim Yok
    Öğe
    A novel optimal energy management strategy for offshore wind/marine current/battery/ultracapacitor hybrid renewable energy system
    (Pergamon-Elsevier Science Ltd, 2020) Aktas, Ahmet; Kircicek, Yagmur
    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 unstable power by nature. Energy storage systems are the most effective solution to minimize power fluctuations in the system and to ensure stable energy demand. This paper presents a novel optimal energy management strategy (NOEMS) for optimal power flow control of the offshore wind/marine current/battery/ultracapacitor hybrid power generation system and for the most efficient harvesting of hybrid renewable energy system (HRES). The proposed NOEMS algorithm calculates as real time the amount of power generated by the HRES and demanded by the load. In this study, nine different dynamic operation modes were considered. Experimental results have shown that the battery and ultracapacitor support to the HRES. In this study, the dynamic behavior of the NOEMS algorithm was investigated by performing a sudden load test from 18 W to 30 W. The NOEMS algorithm shows that the system can minimize power loss, voltage fluctuation, control the charge/discharge status of the battery and ultracapacitor. The proposed algorithm continuously shifts the required power over the hybrid energy storage system to provide the load demand continuously. (C) 2020 Elsevier Ltd. All rights reserved.