In this study, a fuzzy-PI controlled grid interactive inverter has been designed and implemented.... more In this study, a fuzzy-PI controlled grid interactive inverter has been designed and implemented. The proportional and integral gains of the PI controller are decided and tuned by the fuzzy logic controller (FLC) according to required operation point of the system. Thus, adaptive nature of the FLC and robust structure of the PI controller are synthesised. Eventually, an adaptive PI controller which can adopt changes because of different operation conditions, grid disturbances and natural effects with fast transient response is obtained. Simulation studies are validated with experimental results. Both simulation and experimental results show that proposed system has fast dynamic response and tracks reference current with a low overshot and short settling time. In addition, the waveform of the inverter output current is sinusoidal and also the current is in same phase and frequency with the line voltage. Furthermore, the total harmonic distortion level of the inverter current meets the international standards. In addition, the proposed inverter system is compared with conventional PI controlled grid interactive inverter with various proportional and integral gains.
Electric Power Components and Systems, Jul 30, 2023
Three-dimensional (3D) finite element (FE) modelling of axial flux permanent magnet (AFPM) motors... more Three-dimensional (3D) finite element (FE) modelling of axial flux permanent magnet (AFPM) motors is one of the time-consuming tasks which must be completed before manufacturing the prototype motor. A simple, fast, accurate, and effective numerical modelling approach for such 3D problems would be particularly useful for researchers. This study presents simple and effective 2D FE modelling approaches for AFPM motors with good accuracy with less computational effort. The modelling approaches are based on a number of 2D models or planes with inner rotor, outer rotor, or linear motor topologies. All the 2D planes with either topology are superposed together to represent the real AFPM machine. These approaches are examined in detail with various types of experimentally verified AFPM motors. Results obtained from the proposed modelling approaches are verified with 3D FE analyses and experimental data. The results indicate that the proposed 2D modelling approaches can significantly reduce the computation time with good accuracy as opposed to conventional 3D FE modelling of AFPM motors.
ABSTRACT Due to decrease in the cost of personal computer and several easily accessible software ... more ABSTRACT Due to decrease in the cost of personal computer and several easily accessible software packages, computer-aided training has been became the most important technique regarding to other education methods in recent years. In this study, a training tool has been developed to analyze the serial and parallel RLC circuits which are one of the basic topics in the field of electrical engineering. For this purpose, a visual interface has been designed with C#.NET called as visual C Sharp in order to analyze basic RLC circuits in MATLAB® environment using MATLAB® BuilderTM NE toolbox. Students can visually analyze by changing simulation parameters of RLC circuits via the graphical user interface developed.
Abstract This study introduces an intelligent power factor correction approach based on Linear Re... more Abstract This study introduces an intelligent power factor correction approach based on Linear Regression (LR) and Ridge Regression (RR) methods. The 10-fold Cross Validation (CV) test protocol has been used to evaluate the performance. The best test performance ...
Abstract In this study, a novel zero-crossing detector has been designed and implemented that ope... more Abstract In this study, a novel zero-crossing detector has been designed and implemented that operates as quite steady under the distorted grids due to harmonics. For this aim, a circuit has been designed using UA741, an operational amplifier, which is not affected ...
One of the most important stages of the engineering education is the laboratory experiments. This... more One of the most important stages of the engineering education is the laboratory experiments. This paper presents remote access to a real time experimental set of a three phase induction motor. In the developed experimental set the crystal report service is used so that users can report the results of the experiments as a document such as PDF, Word or Excel file format without losing time. Due to experimental set improved, the speed control, the torque analysis and the energy efficiency of 3-phase induction motor can be performed over the internet in real time. Streszczenie. W artykule przedstawiono system zdalnego dostępu w czasie rzeczywistym do stanowiska eksperymentalnego, złożonego z trójfazowej maszyny indukcyjnej. Opracowane rozwiązanie daje możliwość tworzenia raportów i sprawozdań standardowych dokumentach (PDF, doc, Excel). (Zdalne sterowanie prędkością i momentem trójfazowej maszyny indukcyjnej poprzez połączenie internetowe).
ABSTRACT In this study, a multi-purpose training set has been designed and implemented as an auxi... more ABSTRACT In this study, a multi-purpose training set has been designed and implemented as an auxiliary learning tool to teach the main concepts of electrical motors for students who attend the vocational and technical education. The system deals with three types of electrical motors as direct current (DC) motor, stepper motor and servo motor, which are controlled by a microcontroller. Although most of the systems in classical laboratories are focused on experimental activities without theoretical substructure, the system presented integrates the hands-on activities with the theoretical information. For this purpose, the theoretical information related to each electrical motor in the system has been given to the students firstly. Then, proficiency of the students has been evaluated using test questions related to the topic. Finally, if the students are reached to the desired level, they can perform the experimental studies using the system in order to efficiently reinforce the theoretical courses they have already learned. Combining the theoretical information with the application studies can be shown as an advantage of this study.
Endüstride ve konutlarda geniş bir kullanım alanına sahip olan sıvı depolama tanklarının seviye, ... more Endüstride ve konutlarda geniş bir kullanım alanına sahip olan sıvı depolama tanklarının seviye, basınç ve sıcaklık verilerinin izlenmesi ve meydana gelebilecek problemlere karşı korunması çok önemlidir. Bu çalışmada, su depolama tankları için programlanabilir mantıksal denetleyici (PLC) kontrollü bir izleme ve kontrol yöntemi önerilmiştir. Klasik kumanda sistemlerinde kullanılan röleler, kontaktörler, sayıcılar ve dönüştürme kartları geliştirilen sistemde kullanılmaması sistemin kurulum maliyetini azaltmıştır. Buna ilaveten sistemde basınç, sıcaklık ve sıvı seviyesi bilgisinin anlık olarak bilgisayar üzerinden izlenebilmesi, sistemin görsel olarak takip edilebilmesini ve olası bir arızanın uyarı mesajlarıyla daha kolay tespit edilebilmesini sağlamıştır. Yapılan deneysel çalışma geliştirilen sistemin daha az maliyetli, hassas ve klasik metot kadar güvenilir olduğunu göstermiştir.
Journal of Materials Science: Materials in Electronics, Feb 27, 2021
Sol–gel method as a simple and low-cost approach is used to fabricate the heterostructures. Herei... more Sol–gel method as a simple and low-cost approach is used to fabricate the heterostructures. Herein, Al-doped ZnO (AZO) thin films on p-Si subtrates are deposited via sol-gel method. AFM and SEM results reveal that the films have appreciably smooth surfaces. XRD results demonstrate that the films have highly oriented crystal structure, and the doping process is successfully performed. The analysis of I–V measurement characteristics unveils a nonideal diode behavior of AZO/Si heterojunctions. Considering the electrical properties, the device with AZO layer of 80 nm demonstrates a good rectifying behavior with rectification ratio of 926 at ± 4 V. The fabricated devices can be thought as diode for real applications. This investigation offers a paradigm for fabricating diodes from traditional semiconductor films.
In this study, an automatic voltage regulator (AVR) based on artificial neural network (ANN) is p... more In this study, an automatic voltage regulator (AVR) based on artificial neural network (ANN) is presented for a standalone synchronous generator. The AVR maintains the constant output voltage independent of load by altering its excitation current and brings the output voltage to the desired level. Generally, AVR systems are designed by using proportional-integral-derivative (PID) controller. In this paper ANN based AVR system is proposed to get the constant output voltage. An experimental setup was prepared to acquire data to be used for training ANN. The experimental setup consists of synchronous generator, asynchronous motor as actuation machine, frequency inverter and load groups. ANN is trained with the experimental data by using 3 different learning methods defined on MATLAB. Then, the ANN, which is trained by each learning method respectively, is tested separately on MATLAB and the results are compared.
ABSTRACT Renewable energy sources have been an attraction for both researchers and scientists rec... more ABSTRACT Renewable energy sources have been an attraction for both researchers and scientists recently. In this study, a survey focused on renewable energy sources in Turkey has been presented. The survey has been conducted by researchers working in different scientific disciplines registered to Scientific and Technological Research Council of Turkey. The questionnaires have been prepared in order to explore the opinions of researchers related to renewable energy issues. Turkey has important potential on account of renewable energy sources as well as geographical location has been suitable for the use of those sources simultaneously. However, Turkey has imported more than half part of its energy and depends on foreign energy supplies. This situation demonstrates that there is large difference between estimated renewable energy potential and the amount of renewable energy employed in Turkey. The aim of this article is to reveal the reasons of this gap through the perspective of academics. The results of survey are indicated the attitudes of researchers studying in several fields about the renewable energy issues of Turkey.
Rapid development of wireless network technologies allows smartphones to take computer's plac... more Rapid development of wireless network technologies allows smartphones to take computer's place in many areas. Therefore, the majority of work to be done on the computer can be done via smartphones without place limitation and trouble of carrying computer. Using smartphones on vocational education necessitates mobilizing of modelling studies. This study aims to design a mobile simulation tool by using solar panels' datasheets. Due to designed simulation tool, the current-voltage (I-V) and the power-voltage (P-V) curve of the predefined solar panels or unspecified solar panels whose data should be manually entered by user can be simulated. These curves, which are important in determining the maximum power point of the solar panels, can be saved on the smartphone or share via e-mail. The developed mobile simulation tool for Android platform can be easily used by the user at every level and therefore it can be used for educational and professional purposes.
In this study, a fuzzy-PI controlled grid interactive inverter has been designed and implemented.... more In this study, a fuzzy-PI controlled grid interactive inverter has been designed and implemented. The proportional and integral gains of the PI controller are decided and tuned by the fuzzy logic controller (FLC) according to required operation point of the system. Thus, adaptive nature of the FLC and robust structure of the PI controller are synthesised. Eventually, an adaptive PI controller which can adopt changes because of different operation conditions, grid disturbances and natural effects with fast transient response is obtained. Simulation studies are validated with experimental results. Both simulation and experimental results show that proposed system has fast dynamic response and tracks reference current with a low overshot and short settling time. In addition, the waveform of the inverter output current is sinusoidal and also the current is in same phase and frequency with the line voltage. Furthermore, the total harmonic distortion level of the inverter current meets the international standards. In addition, the proposed inverter system is compared with conventional PI controlled grid interactive inverter with various proportional and integral gains.
Electric Power Components and Systems, Jul 30, 2023
Three-dimensional (3D) finite element (FE) modelling of axial flux permanent magnet (AFPM) motors... more Three-dimensional (3D) finite element (FE) modelling of axial flux permanent magnet (AFPM) motors is one of the time-consuming tasks which must be completed before manufacturing the prototype motor. A simple, fast, accurate, and effective numerical modelling approach for such 3D problems would be particularly useful for researchers. This study presents simple and effective 2D FE modelling approaches for AFPM motors with good accuracy with less computational effort. The modelling approaches are based on a number of 2D models or planes with inner rotor, outer rotor, or linear motor topologies. All the 2D planes with either topology are superposed together to represent the real AFPM machine. These approaches are examined in detail with various types of experimentally verified AFPM motors. Results obtained from the proposed modelling approaches are verified with 3D FE analyses and experimental data. The results indicate that the proposed 2D modelling approaches can significantly reduce the computation time with good accuracy as opposed to conventional 3D FE modelling of AFPM motors.
ABSTRACT Due to decrease in the cost of personal computer and several easily accessible software ... more ABSTRACT Due to decrease in the cost of personal computer and several easily accessible software packages, computer-aided training has been became the most important technique regarding to other education methods in recent years. In this study, a training tool has been developed to analyze the serial and parallel RLC circuits which are one of the basic topics in the field of electrical engineering. For this purpose, a visual interface has been designed with C#.NET called as visual C Sharp in order to analyze basic RLC circuits in MATLAB® environment using MATLAB® BuilderTM NE toolbox. Students can visually analyze by changing simulation parameters of RLC circuits via the graphical user interface developed.
Abstract This study introduces an intelligent power factor correction approach based on Linear Re... more Abstract This study introduces an intelligent power factor correction approach based on Linear Regression (LR) and Ridge Regression (RR) methods. The 10-fold Cross Validation (CV) test protocol has been used to evaluate the performance. The best test performance ...
Abstract In this study, a novel zero-crossing detector has been designed and implemented that ope... more Abstract In this study, a novel zero-crossing detector has been designed and implemented that operates as quite steady under the distorted grids due to harmonics. For this aim, a circuit has been designed using UA741, an operational amplifier, which is not affected ...
One of the most important stages of the engineering education is the laboratory experiments. This... more One of the most important stages of the engineering education is the laboratory experiments. This paper presents remote access to a real time experimental set of a three phase induction motor. In the developed experimental set the crystal report service is used so that users can report the results of the experiments as a document such as PDF, Word or Excel file format without losing time. Due to experimental set improved, the speed control, the torque analysis and the energy efficiency of 3-phase induction motor can be performed over the internet in real time. Streszczenie. W artykule przedstawiono system zdalnego dostępu w czasie rzeczywistym do stanowiska eksperymentalnego, złożonego z trójfazowej maszyny indukcyjnej. Opracowane rozwiązanie daje możliwość tworzenia raportów i sprawozdań standardowych dokumentach (PDF, doc, Excel). (Zdalne sterowanie prędkością i momentem trójfazowej maszyny indukcyjnej poprzez połączenie internetowe).
ABSTRACT In this study, a multi-purpose training set has been designed and implemented as an auxi... more ABSTRACT In this study, a multi-purpose training set has been designed and implemented as an auxiliary learning tool to teach the main concepts of electrical motors for students who attend the vocational and technical education. The system deals with three types of electrical motors as direct current (DC) motor, stepper motor and servo motor, which are controlled by a microcontroller. Although most of the systems in classical laboratories are focused on experimental activities without theoretical substructure, the system presented integrates the hands-on activities with the theoretical information. For this purpose, the theoretical information related to each electrical motor in the system has been given to the students firstly. Then, proficiency of the students has been evaluated using test questions related to the topic. Finally, if the students are reached to the desired level, they can perform the experimental studies using the system in order to efficiently reinforce the theoretical courses they have already learned. Combining the theoretical information with the application studies can be shown as an advantage of this study.
Endüstride ve konutlarda geniş bir kullanım alanına sahip olan sıvı depolama tanklarının seviye, ... more Endüstride ve konutlarda geniş bir kullanım alanına sahip olan sıvı depolama tanklarının seviye, basınç ve sıcaklık verilerinin izlenmesi ve meydana gelebilecek problemlere karşı korunması çok önemlidir. Bu çalışmada, su depolama tankları için programlanabilir mantıksal denetleyici (PLC) kontrollü bir izleme ve kontrol yöntemi önerilmiştir. Klasik kumanda sistemlerinde kullanılan röleler, kontaktörler, sayıcılar ve dönüştürme kartları geliştirilen sistemde kullanılmaması sistemin kurulum maliyetini azaltmıştır. Buna ilaveten sistemde basınç, sıcaklık ve sıvı seviyesi bilgisinin anlık olarak bilgisayar üzerinden izlenebilmesi, sistemin görsel olarak takip edilebilmesini ve olası bir arızanın uyarı mesajlarıyla daha kolay tespit edilebilmesini sağlamıştır. Yapılan deneysel çalışma geliştirilen sistemin daha az maliyetli, hassas ve klasik metot kadar güvenilir olduğunu göstermiştir.
Journal of Materials Science: Materials in Electronics, Feb 27, 2021
Sol–gel method as a simple and low-cost approach is used to fabricate the heterostructures. Herei... more Sol–gel method as a simple and low-cost approach is used to fabricate the heterostructures. Herein, Al-doped ZnO (AZO) thin films on p-Si subtrates are deposited via sol-gel method. AFM and SEM results reveal that the films have appreciably smooth surfaces. XRD results demonstrate that the films have highly oriented crystal structure, and the doping process is successfully performed. The analysis of I–V measurement characteristics unveils a nonideal diode behavior of AZO/Si heterojunctions. Considering the electrical properties, the device with AZO layer of 80 nm demonstrates a good rectifying behavior with rectification ratio of 926 at ± 4 V. The fabricated devices can be thought as diode for real applications. This investigation offers a paradigm for fabricating diodes from traditional semiconductor films.
In this study, an automatic voltage regulator (AVR) based on artificial neural network (ANN) is p... more In this study, an automatic voltage regulator (AVR) based on artificial neural network (ANN) is presented for a standalone synchronous generator. The AVR maintains the constant output voltage independent of load by altering its excitation current and brings the output voltage to the desired level. Generally, AVR systems are designed by using proportional-integral-derivative (PID) controller. In this paper ANN based AVR system is proposed to get the constant output voltage. An experimental setup was prepared to acquire data to be used for training ANN. The experimental setup consists of synchronous generator, asynchronous motor as actuation machine, frequency inverter and load groups. ANN is trained with the experimental data by using 3 different learning methods defined on MATLAB. Then, the ANN, which is trained by each learning method respectively, is tested separately on MATLAB and the results are compared.
ABSTRACT Renewable energy sources have been an attraction for both researchers and scientists rec... more ABSTRACT Renewable energy sources have been an attraction for both researchers and scientists recently. In this study, a survey focused on renewable energy sources in Turkey has been presented. The survey has been conducted by researchers working in different scientific disciplines registered to Scientific and Technological Research Council of Turkey. The questionnaires have been prepared in order to explore the opinions of researchers related to renewable energy issues. Turkey has important potential on account of renewable energy sources as well as geographical location has been suitable for the use of those sources simultaneously. However, Turkey has imported more than half part of its energy and depends on foreign energy supplies. This situation demonstrates that there is large difference between estimated renewable energy potential and the amount of renewable energy employed in Turkey. The aim of this article is to reveal the reasons of this gap through the perspective of academics. The results of survey are indicated the attitudes of researchers studying in several fields about the renewable energy issues of Turkey.
Rapid development of wireless network technologies allows smartphones to take computer's plac... more Rapid development of wireless network technologies allows smartphones to take computer's place in many areas. Therefore, the majority of work to be done on the computer can be done via smartphones without place limitation and trouble of carrying computer. Using smartphones on vocational education necessitates mobilizing of modelling studies. This study aims to design a mobile simulation tool by using solar panels' datasheets. Due to designed simulation tool, the current-voltage (I-V) and the power-voltage (P-V) curve of the predefined solar panels or unspecified solar panels whose data should be manually entered by user can be simulated. These curves, which are important in determining the maximum power point of the solar panels, can be saved on the smartphone or share via e-mail. The developed mobile simulation tool for Android platform can be easily used by the user at every level and therefore it can be used for educational and professional purposes.
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Papers by Orhan KAPLAN