Papers by H. Bulent Ertan
IEEE Transactions on Instrumentation and Measurement
2019 International Aegean Conference on Electrical Machines and Power Electronics (ACEMP) & 2019 International Conference on Optimization of Electrical and Electronic Equipment (OPTIM), 2019
2019 International Aegean Conference on Electrical Machines and Power Electronics (ACEMP) & 2019 International Conference on Optimization of Electrical and Electronic Equipment (OPTIM), 2019
This paper investigates an integration of Offshore Wind Farm Plants with Power Grid Based on an H... more This paper investigates an integration of Offshore Wind Farm Plants with Power Grid Based on an HVDC line Interconnection. Large offshore wind farms are installed in the North Sea area using modern multi-megawatt wind turbines. The Voltage source converter - high voltage direct current VSC-HVDC is a suitable means of integrating such large and distant offshore Wind Power Plants (WPP) which need long submarine cable transmission to the onshore grid. The offshore network then becomes very different from the conventional grid, in that it is only connected to electronic power converters. A wind farm model with VSC-HVDC connection is developed. This work presents the modeling and simulation of such a system. The dynamic study of system performance under the fluctuations of wind energy and wind speed was studied to demonstrate the effectiveness of the control strategy. The validity of the proposed control technique is verified by Matlab/Simulink. Simulation results presented in this paper confirm the validity and feasibility of the proposed control approach, and can be tested on experimental setup.
2019 International Aegean Conference on Electrical Machines and Power Electronics (ACEMP) & 2019 International Conference on Optimization of Electrical and Electronic Equipment (OPTIM), 2019
Solar energy is an abundant renewable source which is expected to play an increasing role in terr... more Solar energy is an abundant renewable source which is expected to play an increasing role in terrestrial and space systems future infrastructure for distributed power generation. Improving of solar performance and efficiency is a key goal of research and the prominent factor in photovoltaic systems which make PV technologies cost-competitive with conventional sources of energy. Multi-junction solar cells are the most efficient technology for generation of electricity from solar irradiation. It's estimated that these cells have an incredible efficiency for more than 40%. They have the advantage of improved performance. Highly efficient multi-junction solar cells find their use in many applications. In regard to terrestrial industrial applications, AC electrics motors are being fed from the multi-junction photovoltaic systems when exposed to high light concentrations using a boost converter and three phase inverter for variable speed AC induction motor drives based on full digital control. Another application for multi-junction solar cells is the use in space vehicles and satellites under low light concentrations. The aim of this research work was modeled and simulated the multi-junction solar cells to improve their performance in terms of efficiency for further exploration in future photovoltaic power generation systems and implemented a variable speed control of an AC Induction Motor using the dsPIC30F Microcontroller for high performance industrial applications.
2003 IEEE International Symposium on Electromagnetic Compatibility, 2003. EMC '03., 2003
... Development Stage Bar]! Colak H. Bulent Ertan Information Technologies and Electronics Resear... more ... Development Stage Bar]! Colak H. Bulent Ertan Information Technologies and Electronics Research Institute (SILTEN) METU 0653 1 Ankara TURKEY Middle East Technical University and BILTEN Electrical and Electronics Engineering Department 0653 1 Ankara TURKEY ...
2017 International Conference on Optimization of Electrical and Electronic Equipment (OPTIM) & 2017 Intl Aegean Conference on Electrical Machines and Power Electronics (ACEMP), 2017
This paper describes design modifications of a brushed permanent magnet DC motor. Test motor is m... more This paper describes design modifications of a brushed permanent magnet DC motor. Test motor is modeled using a Finite Element Method (FEM) based software. Model accuracy is investigated by comparing measurement and simulation results. Reducing material consumption in motor fabrication while the motor develops the desired torque at a higher efficiency is aimed in this paper. Modifications are done in three stages and simulations results are also presented. These results are also compared to simulation results of the test machine.
2016 IEEE Transportation Electrification Conference and Expo (ITEC), 2016
In the literature, the approach for DC link design is based on steady-state rated power operation... more In the literature, the approach for DC link design is based on steady-state rated power operation of the converter application. In this study, an approach is proposed for designing the filter considering the requirements for dynamic conditions. This approach considers: excessive ripple current, power loss on DC link components and DC link voltage drop causing performance loss during dynamic conditions for a motor driver. To analyze DC link operation in dynamic conditions, a simplified model is developed for simulating the drive-motor combination. This model can be used to model any motor driver by changing the model parameters and it is independent from control parameters of driver. The model is verified through comparison of the results obtained via simulation and experimental tests.
2018 International Symposium on Power Electronics, Electrical Drives, Automation and Motion (SPEEDAM), 2018
This work is aimed to develop a realistic design procedure for a series hybrid plug in vehicle, w... more This work is aimed to develop a realistic design procedure for a series hybrid plug in vehicle, with a view to use it in a mathematical design optimization. The purpose of the optimization is minimizing the initial cost, as well as the running costs of the vehicle. Therefore there is a multi-objective design optimization problem in hand. Such problems are very suitable for mathematical optimization, however, accurate and not time consuming design procedure is a must, to obtain meaningful results. This paper introduces such a design procedure. The approach is illustrated on a commercial vehicle simulation model. The accuracy of the model is illustrated by comparing simulation results with vehicle test results.
Thispaper describes anovel approach forofflinespeed measurement isalsorequired. Inthis paperwesha... more Thispaper describes anovel approach forofflinespeed measurement isalsorequired. Inthis paperweshall stator leakage inductance andonline stator resistance estimationconsider FOCofaninduction motor. thatcanbeusedforself-tuning ofinduction motordrives. The Therearetwobasic modelsforfield-oriented control of paperbriefly describes thetheory behind theapproach. The induction motors (2): proposed methodsareexperimentally tested onanindustrial model:Thismodelrequires an accurate induction motorandalso tested onawashing machine motor * eCurrent of theo me constant an accurate designed forvariable speed operation. Testresults aregiven and measurement oftherotor timeconstant andaccurate therobustness oftheapproach isillustrated. measurement ofmechanical speed ofthemotor(3); * Voltage model:Thismodeldoesnotrequire speed IndexTerms-- Induction motordrives, parameter estimation, measement h is acurcdepends onqprecse inductance measurement. ~~~~~measurement; however itS accuracy depends onprecise...
2018 7th International Conference on Reliability, Infocom Technologies and Optimization (Trends and Future Directions) (ICRITO), 2018
Direct drive wind turbines promise to be more reliable and efficient than commonly used geared wi... more Direct drive wind turbines promise to be more reliable and efficient than commonly used geared wind turbines. This paper presents part of a study aiming to identify whether “Dual Stator Spoke Array Vernier Permanent Magnet” (DSSAVPM) generators present an advantage, regarding size or cost, as compared to the conventional radial flux PM machine for direct drive applications. For this purpose, design of both machines is optimized for the same specifications and using the same design criteria. optimization results are presented and discussed. It is found that a DSSVPM generator design, with almost the same performance as the RFPM generator, but with 45% of its mass is possible.
2017 International Conference on Optimization of Electrical and Electronic Equipment (OPTIM) & 2017 Intl Aegean Conference on Electrical Machines and Power Electronics (ACEMP), 2017
This paper considers Dual Stator Spoke Array Vernier Permanent Magnet (DSSA-VPM) generator for th... more This paper considers Dual Stator Spoke Array Vernier Permanent Magnet (DSSA-VPM) generator for the direct drive wind-electric energy conversion. The structure of the generator is described. Although how this design is optimized is not discussed, dimensions of the designed generator are given. In electrical machine design thermal performance is naturally of utmost importance. In this paper thermal performance of the design and how its temperature can be kept within the temperature limit imposed by its insulation class and the permanent magnets used is investigated. It is found that when air flow within the generator is not permitted, at rated load condition the generator temperature reaches very high levels. To lower the operating temperature, ventilation holes are introduced to the end plates of the frame. Also some blades are placed on the rotor to help flow of air over the end windings. A model is introduced to calculate the air speed in the region where air flows. Using the calcu...
2015 Intl Aegean Conference on Electrical Machines & Power Electronics (ACEMP), 2015 Intl Conference on Optimization of Electrical & Electronic Equipment (OPTIM) & 2015 Intl Symposium on Advanced Electromechanical Motion Systems (ELECTROMOTION), 2015
AC drives based on full digital control have reached the status of a maturing technology in a bro... more AC drives based on full digital control have reached the status of a maturing technology in a broad range of applications, ranging from low-cost to high performance systems. In the field of the drive of the electric machines, the elimination of the mechanical speed sensor can present an economic interest and improve safety of operation. With speed estimation, sensorless vector control is possible, meaning that the speed of induction machines without mechanical speed sensors can be controlled. The flux observer is expanded into a combined flux and speed observer, measuring only stator current and voltage. In this work, we develop algorithms of three phase inverter control of IM without speed sensor using DSPic microcontroller. We present two types of speed estimators based on the mathematical model of the machine. The first estimator is called MRAS (Model Reference Adaptive System). The second estimator, based on the estimation of the Back Electromotive Force (BEMF) of induction moto...
2015 Intl Aegean Conference on Electrical Machines & Power Electronics (ACEMP), 2015 Intl Conference on Optimization of Electrical & Electronic Equipment (OPTIM) & 2015 Intl Symposium on Advanced Electromechanical Motion Systems (ELECTROMOTION), 2015
In a previous study a compact Control Moment Gyroscope (GMC) design, based on a 6-pole, axial flu... more In a previous study a compact Control Moment Gyroscope (GMC) design, based on a 6-pole, axial flux (AF) motor was presented. The GMC design in that proposal was based on analytical expressions and naturally 3-D structure of the AF motor could not be fully taken into account. In this paper the designed motor is simulated using 3-D FEM solutions. The parameters of the design such as electric loading and current loading as well as the performance of the design such as phase current and the torque produced at 10000 rpm are determined in a more realistic environment. The results indicate that the adopted analytical design approach is suitable for the design of the CMC motor. However, improvements are needed in the design methodology to reduce torque ripple and take into account the effect of the drive conditions in the operating environment.
Sensorsuz vektor kontrol yontemleri, konum veya hiz sensoru bulundurmamalari nedeni ile kimi uygu... more Sensorsuz vektor kontrol yontemleri, konum veya hiz sensoru bulundurmamalari nedeni ile kimi uygulamalara tercih edilirler. Ancak, bu tip yontemler dogalari geregi rotor manyetik alaninin yerinin tesbiti konusunda hata yaparlar. Bunun sonucu olarak bu sekilde surulen motorlarin performansi, sensorlu vektor uygulamalarina gore daha dusuktur. Bu bildiri, motor akimi icinde bulunan rotor oluklarindan kaynaklanan harmoniklerin, vektor kontrol algoritmasi icinde kullanilabilecek kadar kisa bir sure icinde belirlenmesine imkan saglayan bir yontem sunmaktadir Boylece saglanan geri besleme sensorsuz vektor kontrol yontemleri ile surulen suruculerin performansi sensorlu yontemler kadar iyi hale getirilebilir. Gelistirilen yontemin ozu; akim icindeki oluk harmoniklerini, temel akim bileseni uzerine bindirilmis, genlik modulasyonlu bir sinyal olarak ele almaktir. Bu akim sinyalini demodule ederek rotor oluk harmonik genligi belirlenebilir. Bu bilgiden rotor konumu veya hizi elde edilebilir. Bu...
2018 International Conference and Exposition on Electrical And Power Engineering (EPE), 2018
Sensorless vector control is preferred in some applications, because there is no need for speed o... more Sensorless vector control is preferred in some applications, because there is no need for speed or position sensor. However, by their very nature, they are susceptible to making position error in rotor position estimation. As a consequence the performance of motor drives employing this technology is lower than those which employ sensors. This paper presents a new approach which identifies and uses rotor slot harmonic current component in the stator current to identify rotor position. The time taken by the algorithm used is short enough to be embedded within the vector control algorithm. The essence of the algorithm is treating the current component due to rotor slot harmonics as an amplitude modulated signal on the fundamental current component. The magnitude of this current component is identified via demodulation. Using this information rotor position and speed can be determined. This approach is tested on a commercial induction motor and some results are presented which illustrate that rotor position can be successfully determined.
2021 International Aegean Conference on Electrical Machines and Power Electronics (ACEMP) & 2021 International Conference on Optimization of Electrical and Electronic Equipment (OPTIM), 2021
In this study, a method is developed to identify stator resistance of an induction motor (IM) at ... more In this study, a method is developed to identify stator resistance of an induction motor (IM) at standstill in the self-tuning. An innovation-based adaptive extended Kalman filter (IAEKF) estimator in which the process noise is dynamically updated with an adaptive mechanism different from the conventional extended Kalman filter (EKF) is designed to estimate stator resistance with αβ- stator stationary axis components of stator current and αβ- components of stator flux of an IM. The reason for estimating the stator flux and stator current together with the stator resistance is to both increase the stability of the proposed estimator algorithm by using the correlation between the parameters and states in the non-linear inputs applied to the estimator and obtain the motor flux information needed by the control system. In the proposed IAEKF algorithm, a stator flux-based IM model is used for prediction purposes. The standstill estimation performance of the proposed novel IAEKF is tested with both sinusoidal and PWM power supplies, The real-time estimation results show the effectiveness and prediction accuracy of the proposed stochastic-based estimator.
2009 8th International Symposium on Advanced Electromechanical Motion Systems & Electric Drives Joint Symposium, 2009
... Detect Incipient Stator Inter-Turn Short-Circuits in Induction Machine”, IEEE, 2004 [6] M. Ai... more ... Detect Incipient Stator Inter-Turn Short-Circuits in Induction Machine”, IEEE, 2004 [6] M. Aiello, A. Cataliotti, S. Nuccio, "A Comparison ... 258-268 [9] Hurst KD, Habetler TG" A Comparison of Spectrum Estimation Techniques for Sensorless Speed Detection in Induction Machines ...
2008 IEEE Power and Energy Society General Meeting - Conversion and Delivery of Electrical Energy in the 21st Century, 2008
ABSTRACT The conditions are sought at which an SR motor can be operated with highest efficiency, ... more ABSTRACT The conditions are sought at which an SR motor can be operated with highest efficiency, while producing a desired torque output at low shaft torque ripple. The investigation is based on the simulation software that uses measured flux-linkage (psi, thetas, i) and static torque (T, thetas, i) characteristics of a given motor. The variation of the shaft torque, torque ripple and efficiency of the motor is investigated, while the control variables ldquoadvance anglerdquo and ldquoconduction anglerdquo are swept over their range with a constant phase voltage. It is observed that with correct choice of the control variables it is possible to operate the motor efficiently at low torque ripple, at a desired torque output. The simulation results are shown to be reliable via experiments. A control strategy is suggested for controlling an SR motor shaft torque at the desired conditions.
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Papers by H. Bulent Ertan