Browsing by Author "Kivanc, Omer Cihan"

Now showing 1 - 20 of 22

Citation Count: 1
An approach to improve the performance of cooperative unmanned vehicle team
(Tubitak Scientific & Technological Research Council Turkey, 2019) Kıvanç, Ömer Cihan
In this paper, a method based on optimal energy management is proposed in order to improve the operational and tactical abilities of collaborative unmanned vehicle teams. Collaborative unmanned systems are used in surveillance, tracking, and military operations. The optimal assignment of these tasks requires cooperation among the vehicles in order to generate a strategy that is efficient with respect to overall mission duration and satisfies all problem constraints. The key motivation behind this paper is to design an unmanned vehicle team that mitigates the disadvantages caused by the structures and characteristics of unmanned ground vehicles (UGVs) and unmanned aerial vehicles (UAVs), which are used in these systems. The design steps of the developed system are explained in three sections in a multidisciplinary fashion. In the first section, the optimal energy consumption profile is estimated by simulating the UAV's flight on a Nvidia Jetson TX2 embedded system, located on the UGV. In the second section, a UAV charger design and implementation is done via development of a TMS320F28335 DSP controlled 65 W inductive wireless power transfer circuit, and in the third section an algorithm that calculates the optimal range and route for the user-selected way points using the state of charge of the UAV's LiPo batteries and a preflight simulation using the simulated annealing method are developed. The experiments are performed in real time with an example scenario and the proposed strategy's suitability and effectiveness are verified for cooperative unmanned vehicle teams.
Citation Count: 0
Design and Analysis of Traction System for Electric Kick Scooters
(Ieee, 2020) Kıvanç, Ömer Cihan; Kivanc, Omer Cihan; Ustun, Ozgur
Today, an important part of the continuously developing electric vehicle technology is light electric vehicles. Electric kick scooters are one of the most basic types of light electric vehicles and their usage areas are increasing day by day. Especially for personal use and shared transportation systems, electric kick scooters have an important place. In this stuck the design of the electric motor of a standard electric kick scooter and the characteristics of the power electronics and battery system suitable for this motor are presented. The rated power and maximum power values are determined within the scope of the vehicle's basic parameters, road performance and standards. The electric motor designed in the brushless direct current motor topology has a rated power of 300W and a maximum power value of 600W. The motor has been designed for different number of slot pole ratios, and the most suitable motor has been selected considering the manufacturing, cost and performance values. The fundamental structures and values of motor driver and battery package are briefly investigated. A proper battery capacity is given for maximum allowable travel distance.
Citation Count: 3
Design and Implementation of an Electric Actuated Valve for Precise Fluid Control
(Gazi Univ, 2019) Kıvanç, Ömer Cihan; Ustun, Ozgur; Tosun, Gurkan; Oguz, Ender; Mutlu, Yasar
Fluid control is one of the essential automation application area in industry. In order to fluid control effectively and precisely, valves which are crucial components, need a controlled rotating motion which leads to implement electric motors, electronic controller and gear systems altogether. In this study, an electric motor actuated valve system is designed and prototyped. The design phases are including switch mode power supply (SMPS) design, motor controller circuit design, mechanical implementation and controller design. The designed valve system is manufactured and tested using multi-disciplinary fashion. The application problems are solved by using the proper control techniques and strategies. The precise position control of butterfly disc is also achieved. According to the related industrial standard and application requirements, the experimental results show the effectiveness of the design approach.
Citation Count: 0
Development of a Hybrid Energy Storage System for a Forklift Vehicle
(Ieee, 2024) Tuncay, Ramazan Nejat; Kıvanç, Ömer Cihan; Kivanc, Omer Cihan; Tuncay, Ramazan Nejat; Enerji Sistemleri Mühendisliği / Energy Systems Engineering
This paper presents a prototype hybrid energy storage system with a Li-ion battery and a supercapacitor. Lithium-ion and supercapacitor sizing has been performed by testing the vehicle under different operating conditions (flat road take-off, flat road take-off with load, hill descent without load, hill ascent with load, and hill descent with load) to obtain the torque and power values required by the system. The longitudinal dynamics of the vehicle are analyzed, and the maximum power requirement is determined. Sizing equations have been used to find the ideal number of battery cells in addition to supercapacitors by considering the maximum operating currents. An interleaved buck/boost DC-DC converter is designed to charge and discharge the supercapacitor. Besides, the developed system is tested with different routes and speeds. Additionally, the results show that the hybrid system, especially the presence of a supercapacitor, leads to the reduction of the load on the battery and the increase in its lifetime.
Citation Count: 4
Development of High Efficiency Multi-Output Flyback Converter for Industrial Applications
(Ieee, 2015) Kıvanç, Ömer Cihan; Tuncay, Ramazan Nejat; Oguz, Ender; Ustun, Ozgur; Tuncay, R. Nejat; Enerji Sistemleri Mühendisliği / Energy Systems Engineering
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.
Citation Count: 0
Different Filter Approaches and Performance Analysis of Fundamental Sensors in Autonomous Ground Vehicles
(Ieee, 2016) Kıvanç, Ömer Cihan; Mungan, Tahir Eren; Kivanc, Omer Cihan
Autonomous ground vehicles are being designed and produced for industrial or military purposes. Since most of these vehicles are high cost the sensors used are high sensitive. However, sensors used in low cost robotic applications have low resolution. When non-precision sensor data added to measurement errors caused by different typical of geometry and drive methods, process functions of robots are hitching. To prevent this, five simple-structured filters are designed and compared in this study for low cost distance sensors and GPS sensors data. It has been observed that accuracy of hybrid-structured filters are more suitable than mono-structured filters in the results obtained.
Citation Count: 0
High Performance Position Control of Double Sided Air Core Linear Brushless DC Motor
(Ieee, 2017) Kıvanç, Ömer Cihan; Kivanc, Omer Cihan; Ustun, Ozgur
Double-Sided Air Core Linear Brushless DC motors widely used in the industry where longitude motion is needed. In terms of efficiency, high speed and acceleration, long life, Stiffness, few moving parts, precise positioning and no transmission components, and so on have many advantages. In this paper position control of a Double Sided Air Core Linear BLDC motor is studied by two methods, first of all the classical PID control method is applied to the system and then Fuzzy-PID control method is investigated on system. The motor specifications and technical features of it are derived and presented. The simulation and the motor model including the control algorithm is built by using of Simulink and is investigated. Finally, to validate simulation result, designed controllers are applied to the Double-Sided Air Core Linear Brushless DC Motor practically. The experimental test results validate simulation result and the accuracy of the both control method and their dynamic performances are compared with each other.
Citation Count: 1
An integrated approach for the development of an electric vehicle powertrain: design, analysis, and implementation
(Tubitak Scientific & Technological Research Council Turkey, 2018) Tuncay, Ramazan Nejat; Gökçe, Can; Kıvanç, Ömer Cihan; Kivanc, Omer Cihan; Tosun, Gurkan; Gokce, Can; Cakan, Murat; Enerji Sistemleri Mühendisliği / Energy Systems Engineering; Otomotiv Mühendisliği / Automotive Engineering
Electric motor and power electronic systems are essential elements for the performance and efficiency of electric vehicles (EVs) and hybrid electric vehicles. The inadequacy of the range due to battery limitations is compensated by powertrain solutions and innovative control algorithms. Future targets of electric powertrains are mostly based on weight, space, and efficiency issues. Highly efficient low-volume and lightweight propulsion systems increase the performance of EVs and also enhance their importance as an alternative to internal combustion engine vehicles. In this paper, a detailed propulsion system design study is presented by considering all of the important constraints of the electric powertrain. The design criteria and output, which are opposites of each other, are submitted in terms of their advantages and disadvantages. The tests of all constraints are conducted as a whole and discretely and then the effects of electrical machine and power electronics circuits are presented.
Citation Count: 7
An integrated approach to development of unmanned ground vehicle: design, analysis, implementation and suggestions
(Gazi Univ, Fac Engineering Architecture, 2019) Kıvanç, Ömer Cihan; Mungan, Tahir Eren; Atila, Berkin; Tosun, Gurkan
As the intelligent vehicle concept accelerated with electric vehicles, and then interest in autonomous vehicle technologies increased, investments on unmanned ground vehicle (UGV) studies also accelerated. Unmanned ground vehicles, despite their complex structure and technology, bring many advantages with their use. The most important advantages of UGVs are that they do not have human-specific features (sleepiness, fatigue, anger, etc.), react faster, and reach a decision by calculating possibilities according to the conditions. In this study, a UGV has been developed, which has the ability to navigate to a self-determined or unknown area, ability of mapping, localization, trajectory detection and tracking, detection of obstacles and finding a new path to avoid collisions with these obstacles. In an area without a specific map, skecth or floor plan, UGV's autonomous driving capability in indoor and outdoor, has been verified by the experiments. The phases, problems, solution techniques and results required for UGV design are presented with a systematic approach in this study.
Citation Count: 7
Investigation of Regenerative Braking Performance of Brushless Direct Current Machine Drive System
(Mdpi, 2021) Kıvanç, Ömer Cihan; Ustun, Ozgur
The brushless direct current (BLDC) machines which are preferred in light electric vehicles (LEVs) come forward as high regenerative braking capability machines due to their permanent magnet excitation and relatively simple operation. In this paper, the regenerative braking capability limits of BLDC machines and their drive circuits are examined by taking into account nonlinear circuit parameters and battery internal resistance variation. During energy recovery from mechanical port to electrical port, the inverter of BLDC machine is operated as a boost converter which enables power flow to a battery. However, the regeneration performance is also heavily dependant on the battery condition, particularly the temperature. By means of the developed detailed circuit model including the non-ideal effects of the boosting converter and the increase of the internal resistance variation which is caused by the temperature variation of the battery and ambient temperature, the specific duty cycle can be determined. The specific duty ratio is then applied in a proposed approach for various operation scenarios. The experimental tests are implemented by a 400 W BLDC machine drive system controlled via a TMS320F28335 digital signal processor. The experimental results show that the proposed comprehensive model presents a proper performance estimation of regenerative braking system under varying battery temperature.
Citation Count: 3
A Linear Brushless Direct Current Motor Design Approach for Seismic Shake Tables
(Mdpi, 2020) Kıvanç, Ömer Cihan; Kivanc, Omer Cihan; Mokukcu, Mert Safa
The progress in material and manufacturing technologies enables the emergence of new research areas in electromagnetic actuator applications. Permanent magnet (PM) linear motors are preferred to achieve precise position control and to meet the need for high dynamic forces in the seismic shake tables that are used in analyzing reactions of structure models. The design approaches on the linear motors used in the seismic shake tables may vary depending on the desired force, stroke and acceleration values. Especially, the maximum width, the maximum depth, the maximum linear motor length in longitudinal direction and the maximum travelling distance parameters are the primary design criteria in seismic shake table drive systems. In this paper, a design approach for a linear PM brushless direct current (BLDC) motor with high force/volume, force/weight and force/input power ratios is developed. The design was analyzed using two-dimensional (2D) and three-dimensional (3D) finite element method (FEM) approaches through the ANSYS Maxwell software. The mathematically designed linear BLDC motor was manufactured and subjected to displacement, acceleration and force tests that are used in seismic analyses. The results of the experimental tests validate the convenience of the proposed design approach and the selected parameters.
Citation Count: 8
Low-Cost Position Sensorless Speed Control of PMSM Drive Using Four-Switch Inverter
(Mdpi, 2019) Kıvanç, Ömer Cihan; Ozturk, Salih Baris
A low-cost position sensorless speed control method for permanent magnet synchronous motors (PMSMs) is proposed using a space vector PWM based four-switch three-phase (FSTP) inverter. The stator feedforward dq-axes voltages are obtained for the position sensorless PMSM drive. The q-axis current controller output with a first order low-pass filter formulates the rotor speed estimation algorithm in a closed-loop fashion similar to PLL (Phase Lock Loop) and the output of the d-axis current controller acts as the derivative representation in the stator feedforward voltage equation. The proposed method is quite insensitive to multiple simultaneous parameter variations such as rotor flux linkage and stator resistance due to the dynamic effects of the PI current regulator outputs that are used in the stator feedforward voltages with a proper value of K gain in the q-axis stator voltage equation. The feasibility and effectiveness of the proposed position sensorless speed control scheme for the PMSM drive using an FSTP inverter are verified by simulation and experimental studies.
Citation Count: 4
MATLAB Function Based Approach to FOC of PMSM Drive
(Ieee, 2015) Kıvanç, Ömer Cihan; Ozturk, Salih Buis
In this study, modeling and simulation of a speed sensored field-oriented control (FOC) of a permanent magnet synchronous motor (PMSM) drive is developed by using MATLAB Function blocks in MATLAB/Simulink. This method allows easier algorithm and software development stages for experimental studies compared to the classical block diagram approach. The superiority of the method over commonly used "Code Generation" tools is also emphasized. First, a MATLAB/Simulink model of the FOC of PMSM drive is developed by using MATLAB programming in MATLAB Functions similar to C coding techniques. The results of the simulation are presented. Then, the MATLAB programming based codes developed in simulation are implemented in a TMS320F28335 floating-point MCU by using C programming language and the experimental results are obtained. Finally, the results of the simulation and experiments are compared.
Citation Count: 0
A novel crimping technique approach for high power white good plugs
(Tubitak Scientific & Technological Research Council Turkey, 2022) Kıvanç, Ömer Cihan; Ozgonenel, Okan; Bostan, Omer; Guzel, Sahin; Demirsoy, Mert
The crimping process is essential to human health and the durability of devices, especially in domestic appliances. Moreover, terminal crimping is critical to the safe transmission of electricity; incorrect crimping leads to problems including overheating of the plug, power loss, arc, and failure of the mechanical connection. In recent years, analysis has been performed by the finite element method (FEM) to prevent the incorrect design of crimping and to develop higher performance crimping techniques. A novel crimping technique for domestic appliances requiring high-powered plugs is proposed in this study. After defining the crimp parameters and the materials that are used for the crimp design, optimization is undertaken by using an analytical solver that uses both numerical calculation and finite element method analysis by COMSOL (TM) and Hyperworks. Prototypes are manufactured based on the result of the research, and capability analysis is performed using a histogram diagram. The feasibility and effectiveness of the proposed crimping technique for high-powered applications are validated by simulation and experimental studies.
Citation Count: 8
On Field Weakening Performance of a Brushless Direct Current Motor with Higher Winding Inductance: Why Does Design Matter?
(Mdpi, 2018) Kıvanç, Ömer Cihan; Kivanc, Omer Cihan; Senol, Seray; Fincan, Bekir
This paper comprises the design, analysis, experimental verification and field weakening performance study of a brushless direct current (BLDC) motor for a light electric vehicle. The main objective is to design a BLDC motor having a higher value d-axis inductance, which implies an improved performance of field weakening and a higher constant power speed ratio (CPSR) operation. Field weakening operation of surface-mounted permanent magnet (SMPM) BLDC motors requires a large d-axis inductance, which is characteristically low for those motors due to large air gap and PM features. The design phases of the sub-fractional slot-concentrated winding structure with unequal tooth widths include the motivation and the computer aided study which is based on Finite Element Analysis using ANSYS Maxwell. A 24/20 slot-pole SMPM BLDC motor is chosen for prototyping. The designed motor is manufactured and performed at different phase-advanced currents in the field weakening region controlled by a TMS320F28335 digital signal processor. As a result of the experimental work, the feasibility and effectiveness of field weakening for BLDC motors are discussed thoroughly and the contribution of higher winding inductance is verified.
Citation Count: 2
On-line dead time compensator for PMSM drive based on current observer
(Elsevier - Division Reed Elsevier india Pvt Ltd, 2022) Kıvanç, Ömer Cihan; Ozturk, Salih Baris; Toliyat, Hamid A.
An on-line compensation for the dead time strategy without the knowledge of the current direction is proposed for PMSM drive based on a current observer. The modifications of the motor reference voltages are achieved by an uncomplicated current observer working in conjunction with the feedforward dead time voltage estimator. Therefore, the distortions on phase currents and torque due to dead time are greatly reduced. The proposed method does not require look-up table and coordinate transformations. It also does not need phase current polarity information or calculation of dead time period. Since the proposed scheme requires no extra hardware and time consuming signal processing algorithms, it is appropriate to use in real-time implementation of AC drives. The proposed scheme has been validated in simulation and implemented using TMS320F28335 DSP. Simulation and practical results validate the effectiveness and the feasibility of the proposed scheme. (c) 2021 Karabuk University. Publishing services by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
Citation Count: 0
Optimization of a Cluster-Based Energy Management System Using Deep Reinforcement Learning Without Affecting Prosumer Comfort: V2X Technologies and Peer-to-Peer Energy Trading
(Ieee-inst Electrical Electronics Engineers inc, 2024) Kıvanç, Ömer Cihan; Kivanc, Omer Cihan
The concept of Prosumer has enabled consumers to actively participate in Peer-to-Peer (P2P) energy trading, particularly as Renewable Energy Source (RES)s and Electric Vehicle (EV)s have become more accessible and cost-effective. In addition to the P2P energy trading, prosumers benefit from the relatively high energy capacity of EVs through the integration of Vehicle-to-X (V2X) technologies, such as Vehicle-to-Home (V2H), Vehicle-to-Load (V2L), and Vehicle-to-Grid (V2G). Optimization of an Energy Management System (EMS) is required to allocate the required energy efficiently within the cluster, due to the complex pricing and energy exchange mechanism of P2P energy trading and multiple EVs with V2X technologies. In this paper, Deep Reinforcement Learning (DRL) based EMS optimization method is proposed to optimize the pricing and energy exchanging mechanisms of the P2P energy trading without affecting the comfort of prosumers. The proposed EMS is applied to a small-scale cluster-based environment, including multiple (6) prosumers, P2P energy trading with novel hybrid pricing and energy exchanging mechanisms, and V2X technologies (V2H, V2L, and V2G) to reduce the overall energy costs and increase the Self-Sufficiency Ratio (SSR)s. Multi Double Deep Q-Network (DDQN) agents based DRL algorithm is implemented and the environment is formulated as a Markov Decision Process (MDP) to optimize the decision-making process. Numerical results show that the proposed EMS reduces the overall energy costs by 19.18%, increases the SSRs by 9.39%, and achieves an overall 65.87% SSR. Additionally, numerical results indicates that model-free DRL, such as DDQN agent based Deep Q-Network (DQN) Reinforcement Learning (RL) algorithm, promise to eliminate the energy management complexities with multiple uncertainties.
Citation Count: 1
Residential energy management system based on integration of fuzzy logic and simulated annealing
(Tubitak Scientific & Technological Research Council Turkey, 2022) Kivanc, Omer Cihan; Bilgen, Semih; Tuncay, Ramazan Nejat; Kıvanç, Ömer Cihan; Baysan, Suat; Tuncay, Ramazan Nejat; Bilgisayar Mühendisliği / Computer Engineering; Enerji Sistemleri Mühendisliği / Energy Systems Engineering
With the increase in prosperity level and industrialization, energy need continues to overgrow in many countries. To meet the rapidly increasing energy needs, countries attach great importance to using limited natural resources rationally, diversifying their energy production using novel technologies, improving the efficiency of existing technologies, and implementing policies and strategies toward alternative energy sources. In particular, individual energy prosumers (someone that both produces and consumes energy) head toward smart home energy management systems (SHEMS) that include renewable energy sources in their homes. By integrating PV solar panels into houses, there is a need to optimize home energy production/consumption scenarios by consumer behavior. In this study, an intelligent residential energy management architecture and algorithm to manage residential energy production/consumption are proposed. The algorithm controls the energy flow in the home according to real-time potential solar power estimation, demanded energy estimation, electricity consumption price, and battery state-of-charge (SoC). The fuzzy logic algorithm has been developed to determine the estimated comfort and cost-effectiveness ratios in the near future. The simulated annealing algorithm, a meta-heuristic algorithm, is performed to obtain the best operating point decision of the battery using the comfort and cost-effectiveness ratios. Energy flow direction and battery SoC are optimized using simulated annealing based on the comfort and cost-effectiveness ratio (comparison of alternatives with respect to multiple criteria of different levels of importance for energy usage). The focus is to generate maximum profit from energy sales for monthly profit to be achieved. Prototyped hardware and software are implemented and tested in real-time. The test results show that the 20% reduces energy consumption, and a monthly gain of $89.2 is obtained from energy sales using the proposed method. Therefore, the test results reveal the effectiveness of the proposed architecture and algorithm.
Citation Count: 28
A Review of Modular Multilevel Converters for Stationary Applications
(Mdpi, 2020) Kıvanç, Ömer Cihan; Aksoz, Ahmet; Geury, Thomas; Ozturk, Salih Baris; Kivanc, Omer Cihan; Hegazy, Omar
A modular multilevel converter (MMC) is an advanced voltage source converter applicable to a wide range of medium and high-voltage applications. It has competitive advantages such as quality output performance, high modularity, simple scalability, and low voltage and current rating demand for the power switches. Remarkable studies have been carried out regarding its topology, control, and operation. The main purpose of this review is to present the current state of the art of the MMC technology and to offer a better understanding of its operation and control for stationary applications. In this study, the MMC configuration is presented regarding its conventional and advanced submodule (SM) and overall topologies. The mathematical modeling, output voltage, and current control under different grid conditions, submodule balancing control, circulating current control, and modulation methods are discussed to provide the state of the MMC technology. The challenges linked to the MMC are associated with submodule balancing control, circulating current control, control complexity, and transient performance. Advanced nonlinear and predictable control strategies are expected to improve the MMC control and performance in comparison with conventional control methods. Finally, the power losses associated with the advanced wide bandgap (WBG) power devices (such as SiC, GaN) are explored by using different modulation schemes and switching frequencies. The results indicate that although the phase-shifted carrier-based pulse width modulation (PSC-PWM) has higher power losses, it outputs a better quality voltage with lower total harmonic distortion (THD) in comparison with phase-disposition pulse width modulation (PD-PWM) and sampled average modulation pulse width modulation (SAM-PWM). In addition, WBG switches such as silicon carbide (SiC) and gallium nitride (GaN) devices have lower power losses and higher efficiency, especially at high switching frequency in the MMC applications.
Citation Count: 1
Rotor Position Alignment of FSTPI Based PMSM Drive Using Low Frequency Signal Injection
(Mdpi, 2020) Kıvanç, Ömer Cihan; Kivanc, Omer Cihan; Aksoz, Ahmet; Hegazy, Omar
A PMSM drive with an incremental encoder or using sensorless control requires alignment to a predetermined rotor position (initial position) or initial rotor position detection at start-up. It is desired to lock the rotor to a known state (usually zero angle) at start-up if the initial rotor position detection is not available or difficult to obtain. In this work, a simple and proper zero angle initial rotor position alignment of four-switch three-phase (FSTP) inverter-based PMSM drive is proposed. Low-frequency voltage signal is applied to the d-axis voltage reference of the open-loop FSTPI based PMSM drive scheme without requiring complex trigonometric calculations, PI current regulators and current sensing. Therefore, fluctuated capacitor voltages at the DC-link are obtained allowing current flown through phase a locking the rotor with zero angle, properly. The proposed method has been implemented using a low-cost FSTP voltage source inverter (VSI) for PMSM drive with a floating-point TMS320F28335 DSP. The effectiveness and the feasibility of the proposed zero angle initial rotor position alignment method for PMSM driven by FSTP inverter have been demonstrated through experimental results.