International Conference on Electrical and Electronics Engineering, Dec 18, 2009
A switched-mode power supply (also called as switchingmode power supply, SMPS, or simply switcher... more A switched-mode power supply (also called as switchingmode power supply, SMPS, or simply switcher) is an electronic power supply unit (PSU) that incorporates a switching regulator. This paper investigates SMPS design and a filter solution for common mode noises. At first, the design of an SMPS which has three outputs has been presented after that common mode noises have been determined and then these noises have been tried to be reduced by the filter. The experimental studies have shown that there is a considerable reduction in common mode noises thanks to designed filter.
International Conference on Electrical and Electronics Engineering, Dec 18, 2009
A sine signal synchronous to the power system voltage signal is required in most power electronic... more A sine signal synchronous to the power system voltage signal is required in most power electronics based industrial applications. In this study, a phase locked loop (PLL) and direct look-up table (DLT) based hybrid sine oscillator is developed, and sinusoidal signals of the desired frequency that is synchronous to the reference input signal is generated in real time applicaitons carried out with the developed oscillator.
2009 International Conference on Electrical and Electronics Engineering - ELECO 2009, 2009
A switched-mode power supply (also called as switching-mode power supply, SMPS, or simply switche... more A switched-mode power supply (also called as switching-mode power supply, SMPS, or simply switcher) is an electronic power supply unit (PSU) that incorporates a switching regulator. This paper investigates SMPS design and a filter solution for common mode noises. At first, the design of an SMPS which has three outputs has been presented after that common mode noises have been determined and then these noises have been tried to be reduced by the filter. The experimental studies have shown that there is a considerable reduction in common mode noises thanks to designed filter.
2009 International Conference on Electrical and Electronics Engineering - ELECO 2009, 2009
A sine signal synchronous to the power system voltage signal is required in most power electronic... more A sine signal synchronous to the power system voltage signal is required in most power electronics based industrial applications. In this study, a phase locked loop (PLL) and direct look-up table (DLT) based hybrid sine oscillator is developed, and sinusoidal signals of the desired frequency that is synchronous to the reference input signal is generated in real time applications carried out with the developed oscillator.
2009 International Conference on Electrical and Electronics Engineering - ELECO 2009, 2009
This paper presents real time implementation of a digital controlled conventional boost converter... more This paper presents real time implementation of a digital controlled conventional boost converter works on the fixed frequency driven by the duty cycle control techniques. The digital controller, implemented using ADUC841 microcontroller, monitors the output voltage and calculate the error to determine the next duty cycle value. Simulation and experimental results indicates that the constructed PI controlled boost converter have good transient response as well as stable and accurate steady-state response during the drastically changes occur in input voltage and output load.
Transactions of the Institute of Measurement and Control, 2010
All digital methods developed for frequency measurement suffer from one or more factors such as s... more All digital methods developed for frequency measurement suffer from one or more factors such as superimposed noise, non-linear static characteristics, high-order harmonics and slow response because of complex computations. The measurement speed of conventional analogue methods is constant and depends on the input signal frequency. Additionally, as a result of deviated and/or spurious zero-crossings caused by the DC component, noise and high-order harmonics in the AC waveform, it is hard to attain the desired accuracy with conventional analogue methods. In this study, a phase-locked loop and microcontroller-based hybrid frequency measurement method developed by the modification of conventional zero-crossing is presented. The input signal, with harmonics and noise, and the frequency can be measured in a fast and accurate way with the proposed method, whose real-time application is extremely simple; this is demonstrated in a comparable manner to the studies in the literature. The measu...
Abstract Power system stabilizers improve the dynamic stability of power systems by increasing th... more Abstract Power system stabilizers improve the dynamic stability of power systems by increasing the damping torque of the synchronous machines in the system. Over the last four decades, various approaches for the design of power system stabilizers have been reported in the literature. The sliding-mode controller is one of these approaches that has some advantages, such as parameter insensitivity and realization simplicity, over other approaches. In this article, as a first and new approach for the design of the power system stabilizer in the literature, a model-reference discrete-time sliding-mode controller is presented. The effectiveness and the robustness of the proposed model-reference discrete-time sliding-mode controller based power system stabilizer is demonstrated by a number of studies. Simulation results show that the proposed power system stabilizer performs better for less overshoot and less settling time compared with the conventional and linear quadratic regulator based stabilizers under normal load operation and significant system parameter variation conditions.
Bu çalışmada, açık çevrim, kararsız ve lineer olmayan ikinci dereceden bir yapıda olduğu için bir... more Bu çalışmada, açık çevrim, kararsız ve lineer olmayan ikinci dereceden bir yapıda olduğu için bir birçok kontrol problemine konu olan manyetik top askılama sistemine uygun 2 Serbestlik Dereceli PID kontrolcüsü tasarlanmış ve geleneksel PID kontrolcüsüyle kıyaslanmıştır. Sistem fiziksel parametreler baz alınarak modellenmiş ve uygun birer denge noktası civarında Tylor serisine açılarak lineerleştirilmiştir. PID kontrol parametreleri, ikinci dereceden sistemler için uygun bir yöntem olan kök yerleştirme metoduyla belirlenmiş ve aynı parametreler 2 serbestlik dereceli PID için de kullanılmıştır. Önerilen bu kontrol algoritması ileri yol kazanç parametrelerine sahip olduğu için geleneksel PID kontrolcüsüne göre geçici hal performansının daha da iyileştirilmesi mümkün olmaktadır. Geleneksel kontrolcüden kaynaklanan sisteme ait transfer fonksiyonundaki sıfırların sebep olduğu aşımların önüne geçilmiştir.
TURKISH JOURNAL OF ELECTRICAL ENGINEERING & COMPUTER SCIENCES, 2015
This paper proposes a discrete-time model-reference sliding mode control of three-phase four-leg ... more This paper proposes a discrete-time model-reference sliding mode control of three-phase four-leg voltage source inverters for stand-alone distributed generation systems. Three-phase four-leg voltage source inverters (VSIs) are used in a broad area. A discrete-time model-reference sliding mode controller, having superior advantages such as insensitivity to external disturbances, system parameter variations, and modeling errors, is applied to control the output voltage of three-phase four-leg VSIs. As a new study, the discrete-time model-reference sliding mode control with a supplemented output feedback integral controller is proposed so that the controlled output voltages of the VSI tracks the input reference signal. The controller is designed using the augmented discrete-time error dynamics presented in this paper and is applied to control the output voltage control of a three-phase four-leg based uninterruptable power supply. It is shown that the output voltage of the VSI controlled by the proposed method is accurately regulated for various load conditions such as linear balanced/unbalanced, nonlinear balanced/unbalanced, and instantaneous load changes. The robustness of the proposed method against variations by 20%-50% in R, L, and C filter parameters and 5 different cases are showed.
In this study, the control of magnetic levitation system in discrete time domain is considered. M... more In this study, the control of magnetic levitation system in discrete time domain is considered. Magnetic ball levitation system model is identified, linearized near the equilibrium point and discretized in convenient sampling period. Discrete time sliding mode controller with enhanced exponential reaching law is designed and compared to traditional discrete time constant proportional rate reaching law for the magnetic ball levitation system which is subject to many control problems since it has unstable structure and it has nonlinear dynamics. The asymptotically stability of the system is analyzed by using Lyapunov stability condition with discrete time approach. In order to evaluate the performance of the considered control technique, simulations are conducted and the results show that discrete time enhanced exponential reaching law provides better performance in terms of both reference tracking and disturbance noise rejection as compared to conventional constant proportional rate ...
This study proposes a discrete-time integral terminal sliding mode controller (DITSMC) integrated... more This study proposes a discrete-time integral terminal sliding mode controller (DITSMC) integrated with a sensorless maximum power point tracking (MPPT) method for a permanent magnet synchronous generator (PMSG)-based wind energy conversion system (WECS). The effects of the parameters of the proposed DITSMC on the convergence-time and the errorbound are investigated by the simulation studies. The dynamic performance of the DITSMC has been evaluated experimentally on a test bench for step-type wind changes. The optimum coefficient between the output voltage of the generator and the extracted power from the WECS is determined only for a wind speed by offline studies. Then, the MPPT can be provided using this coefficient for all wind speeds in the operating range of the WECS without any mechanical sensor. Additionally, the experimental studies show that DITSMC has better performance than the PI controller in terms of the settling time and thus the efficiency of the WECS.
In this paper, a double integrator sliding mode controller (DISMC) via the mechanical sensorless ... more In this paper, a double integrator sliding mode controller (DISMC) via the mechanical sensorless maximum power point tracking (MPPT) method is suggested to extract maximum power from a wind energy conversion system (WECS). The controller is required to bring the system to the maximum power point reference generated by the MPPT method. However, the controller design for the WECS operated in a wide wind speed range is a challenging task due to its highly nonlinear behavior. In this study, to enhance the performance of the WECS, a voltage mode DISMC, which is not used before for the WECS, is offered. The dynamic performance of the proposed method, considering the different wind speed scenarios, is proved with the simulation studies. Additionally, the performance of the DISMC is compared with that of the conventional sliding mode controller for the same wind speed scenarios.
International Conference on Electrical and Electronics Engineering, Dec 18, 2009
A switched-mode power supply (also called as switchingmode power supply, SMPS, or simply switcher... more A switched-mode power supply (also called as switchingmode power supply, SMPS, or simply switcher) is an electronic power supply unit (PSU) that incorporates a switching regulator. This paper investigates SMPS design and a filter solution for common mode noises. At first, the design of an SMPS which has three outputs has been presented after that common mode noises have been determined and then these noises have been tried to be reduced by the filter. The experimental studies have shown that there is a considerable reduction in common mode noises thanks to designed filter.
International Conference on Electrical and Electronics Engineering, Dec 18, 2009
A sine signal synchronous to the power system voltage signal is required in most power electronic... more A sine signal synchronous to the power system voltage signal is required in most power electronics based industrial applications. In this study, a phase locked loop (PLL) and direct look-up table (DLT) based hybrid sine oscillator is developed, and sinusoidal signals of the desired frequency that is synchronous to the reference input signal is generated in real time applicaitons carried out with the developed oscillator.
2009 International Conference on Electrical and Electronics Engineering - ELECO 2009, 2009
A switched-mode power supply (also called as switching-mode power supply, SMPS, or simply switche... more A switched-mode power supply (also called as switching-mode power supply, SMPS, or simply switcher) is an electronic power supply unit (PSU) that incorporates a switching regulator. This paper investigates SMPS design and a filter solution for common mode noises. At first, the design of an SMPS which has three outputs has been presented after that common mode noises have been determined and then these noises have been tried to be reduced by the filter. The experimental studies have shown that there is a considerable reduction in common mode noises thanks to designed filter.
2009 International Conference on Electrical and Electronics Engineering - ELECO 2009, 2009
A sine signal synchronous to the power system voltage signal is required in most power electronic... more A sine signal synchronous to the power system voltage signal is required in most power electronics based industrial applications. In this study, a phase locked loop (PLL) and direct look-up table (DLT) based hybrid sine oscillator is developed, and sinusoidal signals of the desired frequency that is synchronous to the reference input signal is generated in real time applications carried out with the developed oscillator.
2009 International Conference on Electrical and Electronics Engineering - ELECO 2009, 2009
This paper presents real time implementation of a digital controlled conventional boost converter... more This paper presents real time implementation of a digital controlled conventional boost converter works on the fixed frequency driven by the duty cycle control techniques. The digital controller, implemented using ADUC841 microcontroller, monitors the output voltage and calculate the error to determine the next duty cycle value. Simulation and experimental results indicates that the constructed PI controlled boost converter have good transient response as well as stable and accurate steady-state response during the drastically changes occur in input voltage and output load.
Transactions of the Institute of Measurement and Control, 2010
All digital methods developed for frequency measurement suffer from one or more factors such as s... more All digital methods developed for frequency measurement suffer from one or more factors such as superimposed noise, non-linear static characteristics, high-order harmonics and slow response because of complex computations. The measurement speed of conventional analogue methods is constant and depends on the input signal frequency. Additionally, as a result of deviated and/or spurious zero-crossings caused by the DC component, noise and high-order harmonics in the AC waveform, it is hard to attain the desired accuracy with conventional analogue methods. In this study, a phase-locked loop and microcontroller-based hybrid frequency measurement method developed by the modification of conventional zero-crossing is presented. The input signal, with harmonics and noise, and the frequency can be measured in a fast and accurate way with the proposed method, whose real-time application is extremely simple; this is demonstrated in a comparable manner to the studies in the literature. The measu...
Abstract Power system stabilizers improve the dynamic stability of power systems by increasing th... more Abstract Power system stabilizers improve the dynamic stability of power systems by increasing the damping torque of the synchronous machines in the system. Over the last four decades, various approaches for the design of power system stabilizers have been reported in the literature. The sliding-mode controller is one of these approaches that has some advantages, such as parameter insensitivity and realization simplicity, over other approaches. In this article, as a first and new approach for the design of the power system stabilizer in the literature, a model-reference discrete-time sliding-mode controller is presented. The effectiveness and the robustness of the proposed model-reference discrete-time sliding-mode controller based power system stabilizer is demonstrated by a number of studies. Simulation results show that the proposed power system stabilizer performs better for less overshoot and less settling time compared with the conventional and linear quadratic regulator based stabilizers under normal load operation and significant system parameter variation conditions.
Bu çalışmada, açık çevrim, kararsız ve lineer olmayan ikinci dereceden bir yapıda olduğu için bir... more Bu çalışmada, açık çevrim, kararsız ve lineer olmayan ikinci dereceden bir yapıda olduğu için bir birçok kontrol problemine konu olan manyetik top askılama sistemine uygun 2 Serbestlik Dereceli PID kontrolcüsü tasarlanmış ve geleneksel PID kontrolcüsüyle kıyaslanmıştır. Sistem fiziksel parametreler baz alınarak modellenmiş ve uygun birer denge noktası civarında Tylor serisine açılarak lineerleştirilmiştir. PID kontrol parametreleri, ikinci dereceden sistemler için uygun bir yöntem olan kök yerleştirme metoduyla belirlenmiş ve aynı parametreler 2 serbestlik dereceli PID için de kullanılmıştır. Önerilen bu kontrol algoritması ileri yol kazanç parametrelerine sahip olduğu için geleneksel PID kontrolcüsüne göre geçici hal performansının daha da iyileştirilmesi mümkün olmaktadır. Geleneksel kontrolcüden kaynaklanan sisteme ait transfer fonksiyonundaki sıfırların sebep olduğu aşımların önüne geçilmiştir.
TURKISH JOURNAL OF ELECTRICAL ENGINEERING & COMPUTER SCIENCES, 2015
This paper proposes a discrete-time model-reference sliding mode control of three-phase four-leg ... more This paper proposes a discrete-time model-reference sliding mode control of three-phase four-leg voltage source inverters for stand-alone distributed generation systems. Three-phase four-leg voltage source inverters (VSIs) are used in a broad area. A discrete-time model-reference sliding mode controller, having superior advantages such as insensitivity to external disturbances, system parameter variations, and modeling errors, is applied to control the output voltage of three-phase four-leg VSIs. As a new study, the discrete-time model-reference sliding mode control with a supplemented output feedback integral controller is proposed so that the controlled output voltages of the VSI tracks the input reference signal. The controller is designed using the augmented discrete-time error dynamics presented in this paper and is applied to control the output voltage control of a three-phase four-leg based uninterruptable power supply. It is shown that the output voltage of the VSI controlled by the proposed method is accurately regulated for various load conditions such as linear balanced/unbalanced, nonlinear balanced/unbalanced, and instantaneous load changes. The robustness of the proposed method against variations by 20%-50% in R, L, and C filter parameters and 5 different cases are showed.
In this study, the control of magnetic levitation system in discrete time domain is considered. M... more In this study, the control of magnetic levitation system in discrete time domain is considered. Magnetic ball levitation system model is identified, linearized near the equilibrium point and discretized in convenient sampling period. Discrete time sliding mode controller with enhanced exponential reaching law is designed and compared to traditional discrete time constant proportional rate reaching law for the magnetic ball levitation system which is subject to many control problems since it has unstable structure and it has nonlinear dynamics. The asymptotically stability of the system is analyzed by using Lyapunov stability condition with discrete time approach. In order to evaluate the performance of the considered control technique, simulations are conducted and the results show that discrete time enhanced exponential reaching law provides better performance in terms of both reference tracking and disturbance noise rejection as compared to conventional constant proportional rate ...
This study proposes a discrete-time integral terminal sliding mode controller (DITSMC) integrated... more This study proposes a discrete-time integral terminal sliding mode controller (DITSMC) integrated with a sensorless maximum power point tracking (MPPT) method for a permanent magnet synchronous generator (PMSG)-based wind energy conversion system (WECS). The effects of the parameters of the proposed DITSMC on the convergence-time and the errorbound are investigated by the simulation studies. The dynamic performance of the DITSMC has been evaluated experimentally on a test bench for step-type wind changes. The optimum coefficient between the output voltage of the generator and the extracted power from the WECS is determined only for a wind speed by offline studies. Then, the MPPT can be provided using this coefficient for all wind speeds in the operating range of the WECS without any mechanical sensor. Additionally, the experimental studies show that DITSMC has better performance than the PI controller in terms of the settling time and thus the efficiency of the WECS.
In this paper, a double integrator sliding mode controller (DISMC) via the mechanical sensorless ... more In this paper, a double integrator sliding mode controller (DISMC) via the mechanical sensorless maximum power point tracking (MPPT) method is suggested to extract maximum power from a wind energy conversion system (WECS). The controller is required to bring the system to the maximum power point reference generated by the MPPT method. However, the controller design for the WECS operated in a wide wind speed range is a challenging task due to its highly nonlinear behavior. In this study, to enhance the performance of the WECS, a voltage mode DISMC, which is not used before for the WECS, is offered. The dynamic performance of the proposed method, considering the different wind speed scenarios, is proved with the simulation studies. Additionally, the performance of the DISMC is compared with that of the conventional sliding mode controller for the same wind speed scenarios.
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