Browsing by Author "Tuncay,R.N."

Now showing 1 - 15 of 15

Citation Count: 17
An advanced cell model for diagnosing faults in operation of Li-ion polymer batteries
(2011) Kaypmaz,T.C.; Tuncay,R.N.
In this paper, an advanced cell model is proposed providing a better State of Health (SoH) determination for diagnosing faults during the operation of Li-ion Polymer batteries comparing to classical cell models. Li-ion polymer cell kinetic parameters were obtained by electrochemical impedance spectroscopy method and changes in these parameters were analyzed theoretically in cases of forced charging and discharging. It was observed that classical cell models were not sufficient enough to mimic the irreversible effects on Li-ion polymer cells caused by improper charging and discharging processes. Therefore cell equivalent circuit was improved and classified according to failure states. A new fuzzy logic based SoH evaluation method was developed from experimental results. This model provides means for better classification to define the irreversible changes that cells encounter in their lifetime. © 2011 IEEE.
Citation Count: 0
Car and renewable energy storage accumulators active life extension for hazardous wastes eco-impact minimization
(2010) Ustun,O.; Yilmaz,M.; Ali-Zada,P.; Tuncay,R.N.; Mamadov,H.
The chemical nature of an accumulator battery is likely to defeat the ability to charge. Traumatic damage is being caused to the environment by the accumulator waste-pollutants: sulfuric acid and lead from the accumulators. Similar problems arise with different types of accumulators (NiCd, NiMH, Li-ion, Li-Polymer, etc.) This leakage seeps into waterways, soil and the air of the living beings, animals, birds and humans, especially to children. The paper outlines an examination of a cheap and smart experimental charging-discharging device, which helps getting a significant extension of the active life of car and renewable energy storage accumulators, as well as known methods, therefore minimizing the environmental impact of batteries wastes. Having known the limiting crystallization, it is possible to extend the battery active life cycles more than three times, provide a remediation of these environmental polluting effects and diminish the environmental impact of accumulator hazardous wastes on living organisms. © Copyright 2011 IEEE - All Rights Reserved.
Citation Count: 5
Design and Analysis of 240 Watt SEPIC Converter for LED Applications
(Institute of Electrical and Electronics Engineers Inc., 2019) Hayirli,I.H.; Kelleci,B.; Kivanc,O.C.; Ozturk,S.B.; Tuncay,R.N.; Citci,M.O.
A 240 Watt output power SEPIC converter with an output voltage of 24 V is proposed to be used in automotive and railway LED applications. The input voltage of the converter varies between 16 V and 36 V. The stability of the converter is guaranteed by moving one of the dominant pole to lower frequency and canceling the other pole with a zero. The phase margin is higher than 56° across all input voltage values. The transients of the switch is damped using a passive snubber circuit. Electromagnetic analyses are performed using Ansys SiWave™ to determine voltage drop, current distribution, near and far field and resonance behavior of SEPIC converter. Measurement results indicate that the SEPIC converter is stable under various operating conditions. © 2019 IEEE.
Citation Count: 32
Design and implementation of an electric drive system for in-wheel motor electric vehicle applications
(2011) Tuncay,R.N.; Gökçe, Can; Yilmaz,M.; Gokce,C.; Karakaya,U.; Otomotiv Mühendisliği / Automotive Engineering
This paper presents the design and application of a hub drive system for Hybrid (HEV) and All Electric Vehicles (EV). Initially Matlab SIMULINK model of a hub driven hybrid electric vehicle is developed and the performance values are calculated. Two 15 kW brushless dc machines (BLDC) are designed and manufactured to be located inside the rim of the wheels. The performance tests of these wheels are conducted in laboratory environment. Then, two separately driven rear wheels are mounted to Fiat Linea vehicle. The mechanical differential is replaced by an electronic control technique, which bases upon the detection of the angle of steering wheel. A CAN bus communication is established between the control system of electric drive and Electronic Control Unit (ECU) of the vehicle. The concerted action between electrically driven rear-wheels and Internal Combustion Engine (ICE) driven front axle is achieved. Finally some preliminary road tests are executed and encouraging test results are obtained. The design optimizations between ICE, Electric Drive and Battery Power for various drive cycles are investigated. © 2011 IEEE.
Citation Count: 0
Design and manufacture of electric powertrain and its cooling system for ITU EV project
(Institute of Electrical and Electronics Engineers Inc., 2014) Ustun,O.; Cakan,M.; Tuncay,R.N.; Mokukcu,M.S.; Kivanc,O.C.; Mutlu,Y.; Tosun,G.
In recent years all expositions of cars show that every car manufacturing company is developing at least one electric vehicle. Recently, ITU ALEK (Istanbul Technical University Alternative Energy Club) members and its supervisor created an electric vehicle project called ITU EV (electric vehicle). This project is about developing a drive system for a conventional internal combustion engine (ICE) vehicle. The project which started in 2011, has four different main research areas. These are electric powertrain which includes water cooling design, battery part, controlling part, mechanical construction and outer design part. In this study, electric powertrain design, cooling calculations and design, and production parts of the project will be investigated. For electric drivetrain a special design of 70 kW BLDC (brushless dc) motor is produced and laboratory tests are made. The rated voltage is chosen as 355 V. © 2014 IEEE.
Citation Count: 1
Designing a smart home energy management system to improve cost/comfort factor;
(Institute of Electrical and Electronics Engineers Inc., 2020) Kıvanç,Ö.C.; Bilgen, Semih; Bilgen,S.; Öztürk,S.B.; Baysan,S.; Tuncay,R.N.; Bilgisayar Mühendisliği / Computer Engineering
Home energy management systems optimize the energy buying/selling amount to reduce high costs by increasing individual energy consumption. Shifting the consumption time depending on the tariff is provided as cost, and the more effective and automatic operation of the devices is offered to the user as comfort. In the study, a hardware and software are developed that can estimate solar energy potential, energy consumption and automatically regulate the comfort/cost ratio of domestic energy using these data. Battery status, electricity buying/selling price, weather condition and consumption forecast data are evaluated by fuzzy logic algorithm and provide the ratio of comfort and cost effectiveness. The obtained comfort and cost effectiveness determine the optimum energy supply amount between the battery, grid and solar energy using the simulated annealing algorithm. As a result of the study, it has been determined that the energy cost for the user has decreased and the comfort has increased. © 2020 Turkish Chambers of Electrical Engineers.
Citation Count: 4
Development of high efficiency multi-output flyback converter for industrial applications
(Institute of Electrical and Electronics Engineers Inc., 2016) Tosun,G.; Kivanc,O.C.; Oguz,E.; Ustun,O.; Tuncay,R.N.
This study presents the development processes of a high-efficiency two-output flyback-converter. The detailed design phases are presented together with encountered design obstacles, limitations and the methods to overcome them. Despite their widely use in industry, studies on high-efficient flyback converter design still remains a need. Most of the flyback converters are designed with multi outputs for their various input voltages. This study firstly describes the preliminary design stages, modeling studies and definition of magnetic and electronic components and PCB design processes followed by a prototype manufacturing. Modelling study is conducted in MATLAB/Simulink environment, and PCB design is realized in Altium Designer Software. Prototype is tested and its performance parameters are recorded. It is seen that the performance values are good agreement with those of design objectives. © 2015 Chamber of Electrical Engineers of Turkey.
Citation Count: 6
Diagnosing overcharge behavior in operation of Li-ion polymer batteries
(2012) Kaypmaz,T.C.; Tuncay,R.N.
In this paper, overcharging effects of Li-ion polymer cells were investigated and classified with respect to vehicle safety concerns. An advanced cell model is proposed providing better State of Health (SoH) determination for overcharge behavior in operation of Li-ion Polymer batteries. Li-ion polymer cell kinetic parameters were obtained using Electrochemical Impedance Spectroscopy (EIS) method and changes in these parameters were analyzed theoretically in cases of forced charging. Cell equivalent circuit was improved and additional parameters detected according to overcharge states. This yields a better detection and diagnosis capability for Battery Management System (BMS). These equivalent circuits and experimental results provide better classification when defining the irreversible changes caused by overcharging. © 2012 IEEE.
Citation Count: 2
Electro-hydraulic power steering system modelling for parameter fault detection based on model reference adaptive frame
(IEEE Computer Society, 2016) Kivanc,O.C.; Ozturk,S.B.; Tuncay,R.N.; Kesici,E.; Yazi,C.
A simple and efficient fault detection and parameter monitoring algorithm for electro-hydraulic power steering (EHPS) system is proposed using model reference adaptive system (MRAS) without any additional sensor. In a faulty situation where the hydraulic system is disabled, assisted power is provided by an electric motor. Therefore, in low speed maneuvers, during sudden direction changes and parking, some parameters of an electric motor in EHPS are affected. These changes threaten the vehicle's driving reliability and performance of EHPS. In this study, an EHPS system with rotor flux estimation based adaptive driver torque control principle has been presented. The motor winding temperature is obtained for monitoring purpose with the help of MRAS stator resistance estimation. The proposed parameter estimation method for EHPS has been simulated by using AMESim and MATLAB/Simulink cosimulation model. Simulation results demonstrate the feasibility and effectiveness of the proposed method. © 2016 IEEE.
Citation Count: 0
Exciting system selection for brushless synchronous machine
(2012) Ustun,O.; Ozturk,S.B.; Kivanc,O.C.; Ali Zade,P.G.; Tuncay,R.N.
The paper deals with the special brushless synchronous electrical machine (SBSM) working with an extensive variable load. It's exciting systems usually keep cosθ ≈ 1. Among them are unmanned deep-well oil pumps drives, wind renewable energy SBSM, etc. The SBSMs usually works in harsh climate conditions, where thyristor or IGBT exciting systems are not reliable (except diodes). Oil field drives are supposed to have fire/explosion-proof brushless motors. It is shown in this paper that replacement of induction motors (IMs) with the special brushless synchronous motors (SBSM) with stable cosθ ≈ 1 in the sucker-rod pumps (SRPs) will help to cut energy losses and diminish voltage pulsations in the oil field electric network. It also results in some reduction of oversize motor utilizations. The main proposal of this paper is to avoid any controlled electronic exciting system, but at the same time obtain the stabilizing cosθ ≈ 1 effect by application of the special small construction change in the motor.
Citation Count: 1
Improving the Performance of a Realistic Distribution Network in Kirkuk by Integrating a Distributed Hybrid System
(Gazi Universitesi, 2023) Ahmed,H.K.; Tuncay,R.N.; Alkhafaji,M.H.
This study determines the causes and possible solutions to an actual problem suffers due to the distribution network of Al-Shajara village, a rural feeder in Kirkuk, north of Iraq. It is a radial distribution system with an approximate length of 27 km and is distributed with a system voltage of 11 kV. Consequently, the consumers fed through this feeder are getting excessive voltage drops together with line losses and frequent outages in the power supply. The research works to build a hybrid system of Distributed Generation (DG) based on renewable energies available in the study area are solar energy, hydropower and batteries to cover the energy demand and improve system performance. Moreover, Open Distribution System Simulator (OpenDSS) software connected to MATLAB via an OpenDSS COM server is used to analyze the power flow in the distribution system, while AotoAdd optimization technology is also used to determine the optimal location for the integration of Distributed Generators (DGs) and Shunt Capacitors (SCs). The simulations of the proposed system have been carried out under three different loads according to two scenarios which are the connected mode and the island mode. The results demonstrated the effectiveness of the proposed techniques as well as improved the voltage profile to be within the standard limits in all buses, greater than 0.95 pu and less than 1.05 pu. Furthermore, the percentage reduction of power losses has reached 97% at full load. Additionally, the results proved that the island mode is superior to the connected mode. © 2023, International Journal of Renewable Energy Research. All Rights Reserved.
Citation Count: 17
On regenerative braking capability of BLDC motor
(IEEE Computer Society, 2016) Kivanc,O.C.; Ustun,O.; Tosun,G.; Tuncay,R.N.
The solution for range problems in electric vehicles is implying two essential approaches: consuming electrical energy with maximised efficiency and regenerative braking. Regenerative braking can be implemented by using the any converter used for electric motor control without needing an extra power circuit. To accomplish recovering electrical energy from mechanical energy a voltage boosting operation is necessary which is causing the current flow from induced voltage due to the mechanical motion to battery. In this study, a brushless DC (BLDC) motor drive system used for light electric vehicle propulsion is modeled by considering non-linear effects. The developed model of the motor drive system is used for defining the upper limits and constraints of operation. Analytic calculations and simulation results represent the operation modes of the system when regenerative braking is applied. © 2016 IEEE.
Citation Count: 0
The search for adaptive methods filtering out high-noises and their application on oil complexes' control telemetry systems
(2013) Yilmaz,M.; Ustun,O.; Ali Zada,P.; Tuncay,R.N.
This paper's domain is the application of well-known modern applied mathematical methods in a control structure of oil industry. Electrical Submersible Pumps (ESP) telemetry system allows for the obtaining of information in the neighborhood of different heavy electromagnetic noises. The telemetry system needs to receive accurate information on the pump unit's intake pressure, temperature and most importantly for the submersible electric motor, the stator cooling oil insulation resistance, for the successful exploitation of the ESP. But increasing disturbance levels with the corrupted analog telemetry signal are resulting in increasing noise levels; however, often it is still audible or the control is still reliable. Though, beyond a certain disturbance level, the so-called digital cliff, the digital telemetry signal and control may stop abruptly (Fig. 1). In this paper, an analog signal processing implementation was researched for the detection of the most efficient adaptive noise-cancelling filters among dozens of recognized ones for oil industry ESP telemetry systems of under severely noisy conditions. From ten applied adaptive filter algorithms, only three have shown successfully good results in the early prediction of the ESP electric motor real insulation disruption. © 2013 IEEE.
Citation Count: 1
A Study on the State of Health of Lithium-ion Batteries
(Institute of Electrical and Electronics Engineers Inc., 2021) Baydan,S.S.; Ceylan,M.; Tuncay,R.N.
State of Health (SOH) of lithium-ion batteries is a major criterion to understand the remaining energy left in the battery. For calculating the SOH, among many cumber-some methods, the Incremental Capacity and Delta Voltage (IC/DV) method provides accurate results with less effort. So in this study, IC/DV method was experimentally implemented on a set of 18650 Panasonic cells. It was shown that IC/DV method can successfully predict the SOH of lithium-ion batteries up to 1C charge. © 2021 Chamber of Turkish Electrical Engineers.
Citation Count: 0
Valuations of adaptive methods for filtering out high-noises in oil complexes telemetry systems
(IEEE Computer Society, 2013) Ustun,O.; Yilmaz,M.; Mamedov,H.; Zada,P.A.; Tuncay,R.N.
The ESP telemetry system needs to receive accurate information on the pump unit's intake pressure, temperature and most importantly the electric motor stator cooling oil insulation resistance, for the successful exploitation of the ESP. The increasing disturbance levels with the corrupted analog telemetry signal are resulting in increasing noise levels; however, often it is still audible or the control system is still reliable. Beyond a certain disturbance level - digital cliff, the digital telemetry signal and control may stop abruptly. From ten applied adaptive filter algorithms, only three have shown successfully good results in the early prediction of the ESP electric motor real insulation disruption. © 2013 IEEE.