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    An Application of PDM Technique for MPPT in Solar Powered Wireless Power Transfer Systems
    (Ieee, 2021) Bal, Gungor; Oncu, Selim; Ozturk, Nihat; Unal, Kenan
    In this study, a solar powered wireless power transmission system is simulated with MATLAB/Simulink. Wireless power transmission systems are the process of transferring electrical energy from the transmitting system to the receiving system without any physical connection. Pulse density modulation technique is used to generate control pulses for Maximum Power Point Tracking for wireless power transmission system. While the drive system is operated under soft switching conditions, it is able to follow the maximum power point in photovoltaic panels with high accuracy.
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    Cogging torque reduction by optimal design of PM synchronous generator for wind turbines
    (Pergamon-Elsevier Science Ltd, 2017) Ozturk, Nihat; Dalcali, Adem; Celik, Emre; Sakar, Selcuk
    In this study, design and optimization of a surface-mounted permanent magnet synchronous generator (PMSG) have been carried out for use in low power wind turbines. In the successive optimization steps based upon the parametric solution method, design parameters of skew, pole embrace, and pole arc offset are chosen to be optimized so that the cogging torque is reduced. Cogging torque is a type of torque ripple coming from the machine design and causes undesired vibration and acoustic noise during the operation of machine. Moreover, although the effect of cogging torque in high power surface-mounted PMSGs is not sensible, it becomes important in low power applications to maintain good dynamical behavior. Analytical and finite element analysis (FEA) are conducted after obtaining the magnet structure that provides minimum cogging torque. Electrical and electromagnetic distributions are presented according to the changes in the corresponding design parameters. While the cogging torque in the initial design is 522.7 mNm, it has been reduced to 49.1 mNm in the optimized generator, which in turn means an improvement of about 90%. The generator under consideration has the specifications of 2.5 kW, 120 V, 14-pole with an inner type-rotor. (C) 2017 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
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    Design of Hybrid Controller for Automatic Voltage Regulator
    (Gazi Univ, 2023) Bal, Gungor; Ozturk, Nihat; Oncu, Selim; Unal, Kenan
    Synchronous generators are still the main machines in the production of electrical energy. Changing the excitation current and the rotation speed easily adjust their output voltage and frequency. Since synchronous generators are operated with the grid, the output voltage and frequency must be fixed. Various control systems are used in Automatic Voltage Regulators for adjusting the voltage. In this study, a hybrid controller structure proposed and it operates in MATLAB / Simulink program. The simulation results of the proposed AVR is compared with PID adjusted by Artificial Bee Colonies algorithm and Ziegler-Nichols based different controllers. The comparison was made on maximum overshoot, rise and settling time. According to the comparison made, it was seen that the proposed hybrid controller has better response than the other controllers in terms of maximum overshoot, rise and settling time.
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    MPPT Design for PV-Powered WPT System with Irregular Pulse Density Modulation
    (Taylor & Francis Inc, 2023) Unal, Kenan; Bal, Gungor; Oncu, Selim; Ozturk, Nihat
    Electric vehicles (EVs) are well-known as environmentally friendly systems. Therefore, the demand for EVs is rapidly increasing every day, but for charging batteries of EVs eco-friendly electrical energy sources are needed. To use a clean energy source, this article proposes a wireless power transfer (WPT) system energized by photovoltaic panels. In this study, pulse density modulation technique controlled with incremental conductance algorithm is preferred in the WPT system for both transferring power from primary to secondary windings and for tracking maximum power point (MPP). The proposed system was tested with an experimental prototype and the results were presented. As a result, both 99.22% MPPT efficiency was obtained and power was transferred from primary to secondary with 90% efficiency.
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    Pulse Density Modulation Controlled WPT Charger for LEVs
    (Ieee, 2022) Bal, Gungor; Unal, Kenan; Oncu, Selim; Ozturk, Nihat
    Light Electric Vehicles (LEV) are increasingly used today to provide mobility in crowded cities. The charging process of LEVs has been one of the issues that should be paid attention to. For this purpose, LEVs owned or rented by users need to be charged quickly and reliably. By using Wireless Power Transfer (WPT), this needed quick and reliable charging can be achieved for LEVs. In this paper, Pulse Density Modulation (PDM) is used for charging in Constant Voltage (CV) mode during wireless charging of LEVs with WPT. The simulation study required for CV charging was carried out with MATLAB/Simulink. A WPT system has been proposed that produces a constant output voltage in response to changing equivalent load resistance in CV charging mode.