Turkish Journal of Electrical Engineering and Computer Sciences, 2013
In this paper, the sliding mode control (SMC) scheme of single timescale brushless DC motor (BLDC... more In this paper, the sliding mode control (SMC) scheme of single timescale brushless DC motor (BLDCM) is investigated. The SMC method consists of 2 sections. To simplify the directive of the stability of the controlled single timescale BLDCM in the sliding mode, first a special type of PI switching surface is adopted. Second, the SMC controller is obtained to guarantee the occurrence of the PI switching surface. The effectiveness of the theoretical analysis is evaluated by numerical simulations. Thus, the numerical results are used to show the verification and trustworthiness of the proposed method.
Iranian Journal of Science and Technology-Transactions of Electrical Engineering, Jul 19, 2018
Solid oxide fuel cell (SOFC) provides several benefits such as high efficiency, modularity, quiet... more Solid oxide fuel cell (SOFC) provides several benefits such as high efficiency, modularity, quiet operation and cogeneration alternatives. Nevertheless, the main weakness in SOFC-based power plant has the slow dynamic response during transient situations in peak demand since this problem can be addressed by using complementary system such as a super-capacitor (SC). This paper provides an optimal load sharing and arrangement strategy (LSAS) for a hybrid power system which combines a SOFC stack, a SC module and a battery bank that support local grid. According to LSAS, the SOFC is the primary power source. The SC module is utilized as a backup and complement device to take care of the load following problems of SOFC during transient. The battery bank is added as a high energy density and/or backup device to stabilize the DC bus voltage, while an electrolyzer (ELYZ) is used as a dump load during surplus power. The LSAS operates in two layers. The external layer accomplished the overall power management system. Depending upon load demand, this layer generates references to the internal layer. The internal layer controls the individual subsystems, i.e., SOFC, ELYZ, SC and battery according to the references coming from the external layer. A complete MATLAB/Simulink model has been established to check the performance of the proposed system for the real load conditions. Simulation results show the effectiveness of the proposed system in terms of power transfer, load tracking and grid stability.
In this paper, a new maximum power point tracking (MPPT) method based on the Fibonacci search alg... more In this paper, a new maximum power point tracking (MPPT) method based on the Fibonacci search algorithm (FSA) is proposed for the wind energy conversion system (WECS). The conventional FSA is modified according to the requirements of the WECS to improve its performance as an MPPT algorithm. The performance of the proposed method is investigated for different wind-speed profiles such as step-type and stochastically varied wind speed. Also, the modified FSA based MPPT algorithm is compared with the conventional perturb and observe (CPO) and variable-step PO (VSPO) algorithms. The simulation results approve the superior performance of the proposed method over the CPO and VSPO in terms of maximum power extracted from the system. The real-time performance of the proposed method is also investigated for varying wind conditions in the form of step-up and step-down.
In this study, a new single-state sliding mode controller is proposed that can be used in multi-i... more In this study, a new single-state sliding mode controller is proposed that can be used in multi-input dynamic systems that require the system dynamics to be controlled by a single state variable. The proposed controller is compared with the single state sliding mode controller, which is effective according to a linear feedback controller and a passive controller. To demonstrate the effectiveness of the controllers, the model WINDMI, which is defined as a complex driven damped dynamic system, is preferred as an exemplary model. For the system's dynamics to reach reference in the shortest settling time with minimum overshoot, the sliding surface coefficient and the controller coefficients are optimized according to the sliding surface using Particle Swarm Optimization, Genetic Algorithm, and Pattern Search algorithm. The best values of optimization coefficients are determined by comparing the obtained results. Finally, verifying the effectiveness and reliability of the proposed controller is demonstrated with simulations and numerical analysis.
Bu tezin, veri tabanı üzerinden yayınlanma izni bulunmamaktadır.ÖZET Anahtar Kelimeler: Veri topl... more Bu tezin, veri tabanı üzerinden yayınlanma izni bulunmamaktadır.ÖZET Anahtar Kelimeler: Veri toplama sistemi, analog dijital çevirici, ADC, Örnekleme - tutma, kodlama, haberleşme protokolleri, RS232, paralel port, seri port, Günümüzde elektriksel işaretler fiziksel sistemlere ilişkin birçok bilgi içerir. Bu bilgilerin yeterli doğrulukta analiz edilebilmesi için, fiziksel büyüklüklere ilişkin analog sinyallerin uygun işlenip, istenilen örnekleme aralıklarında dijitale çevrilerek analiz için kullanışlı bir formatta depolanması gerekir, ölçme ve veri toplama sistemlerinin önemi büyüktür, zira hatalı elde edilmiş verilerden yeterince doğru sonuçlar çıkarmak imkansızlaşır. Günümüzde veri toplama sistemleri hem çok pahalı ve hem de çeşitli esneklik sorunları sürmektedir. Sistemde veri toplama kartı ayrıca ele alınırsa, çözünürlükten kaynaklanan hatalar ve dijitale çevrilen bilginin örnekleme frekansının esnek seçilebilirliği ana parametreleri teşkil etmektedir. Ayrıca dijital bilginin bil...
2017 International Conference on Electromechanical and Power Systems (SIELMEN), 2017
The rotating magnetic field is the major concept of induction and synchronous machines. For a thr... more The rotating magnetic field is the major concept of induction and synchronous machines. For a three phase induction motor, locus of net magnetic field of single winding stator is a circle which radius is equal to 3/2 times of one phase's magnetic field peak value. This paper introduces the locus diagram the net magnetic field of Dual Winding Induction Motor (DWIM). One of the stator winding is fed from a different frequency while the other one is fed with nominal frequencies. Hence the different rotating magnetic field speeds (synchronous speeds) are obtained by individual windings. Locus diagrams are obtained with different frequencies. This diagrams obtained for different frequencies are same as petaled flower that is a famous mathematical curve in polar coordinates. The total rotating magnetic field variations obtained in this way will affect the torque values obtained at the motor shaft.
2016 International Conference on Emerging Technologies (ICET), 2016
Applications of PHEV have been observed as popular in transportation sector, but, an uncoordinate... more Applications of PHEV have been observed as popular in transportation sector, but, an uncoordinated charging of PHEV poses an extra load during peak times which brings up many technical problems in which durability of power system occurs first. Considering PHEV to stay for several hours in the parking lot may offer a unique opportunity to charge PHEV from photovoltaic power in those hours. The proposed charging facility is working under smart charging scheduling paradigm, which is independent from forecasting models of PHEVs charging. The proposed paradigm schedules of PHEV is in an optimal way based on two parameters i.e., priority levels of PHEVs charging, and variations in DC link voltage level. Furthermore, the priorities of PHEV charging are based on their power demand, maximum rating of distribution transformer and stay duration of PHEVs in the parking lot during high irradiation of solar effect. The sensing of proposed paradigm is based on change in DC link voltage. The DC link voltage changes due to variance in solar irradiance, temperature and real-time residential load. Such priorities are updated whenever smart charging scheduling paradigm detects changes in voltage and initiate/terminate PHEVs charging. Simulation results express the effectiveness of proposed charging station effectively.
International Journal of Applied Mathematics Electronics and Computers, 2019
3-phase induction motors are widely used in industrial applications such as pumps, blowers, compr... more 3-phase induction motors are widely used in industrial applications such as pumps, blowers, compressors, conveyors, etc. In addition, single-phase motors also have domestic use. For this reason, the design of the induction motor is of great importance. During the design, according to the parameters given as input, there are many situations that are contradictory to each other in order to achieve the goal. For example, if high efficiency is required, the motor size and the price will increase, and if lower price is required, other performance characteristics should be ignored. In the practical design of an induction motor, the designer has to comply with a number of constraints because of the large number of input variables. For this reason manual calculation becomes a very long and difficult process. To overcome this tiresome process, it is necessary to create a computer aided program or simulation model to determine the induction motor design parameters. In induction motor design, many parameters directly affect motor performance. Therefore, the selection of these parameters is of great importance. The output coefficient (C0), which takes place in the first steps of the design process, also has a great influence on the motor design. In this paper, a program for optimizing design of 3-phase induction motors written in MATLAB is presented. The structure of the program is modular and therefore can be modified for the various requirements of the induction motor design. C0 constant, one of the design parameters, also varies with some other parameters. The most important ones are the specific electrical loading coefficient (A1) and the specific magnetic loading coefficient (Bav), making dramatic effect on the output coefficient. The effect of the variation of the C0 constant on the performance of the induction motor was investigated in the study. Stator inner and outer diameter, stack length, stator and rotor slot parameters, equivalent circuit parameters, losses and efficiency was obtained according to the change of Bav and A1 values. The obtained results are given and interpreted in tables and graphs.
In this study, a new reaching rule in the Sliding Mode Control (SMC) is proposed for chaos contro... more In this study, a new reaching rule in the Sliding Mode Control (SMC) is proposed for chaos control and synchronization. It is applied on the nonlinear Chua's circuit. The SMC signals are provided with the Lyapunov stability theory. Classical, cubic and partial cubic variants of SMC signals are constructed. Numerical simulations are performed to compare the effectiveness of the SMC signals and the results are discussed.
Iranian Journal of Science and Technology, Transactions of Electrical Engineering, 2018
Solid oxide fuel cell (SOFC) provides several benefits such as high efficiency, modularity, quiet... more Solid oxide fuel cell (SOFC) provides several benefits such as high efficiency, modularity, quiet operation and cogeneration alternatives. Nevertheless, the main weakness in SOFC-based power plant has the slow dynamic response during transient situations in peak demand since this problem can be addressed by using complementary system such as a super-capacitor (SC). This paper provides an optimal load sharing and arrangement strategy (LSAS) for a hybrid power system which combines a SOFC stack, a SC module and a battery bank that support local grid. According to LSAS, the SOFC is the primary power source. The SC module is utilized as a backup and complement device to take care of the load following problems of SOFC during transient. The battery bank is added as a high energy density and/or backup device to stabilize the DC bus voltage, while an electrolyzer (ELYZ) is used as a dump load during surplus power. The LSAS operates in two layers. The external layer accomplished the overall power management system. Depending upon load demand, this layer generates references to the internal layer. The internal layer controls the individual subsystems, i.e., SOFC, ELYZ, SC and battery according to the references coming from the external layer. A complete MATLAB/Simulink model has been established to check the performance of the proposed system for the real load conditions. Simulation results show the effectiveness of the proposed system in terms of power transfer, load tracking and grid stability.
2017 International Conference on Electromechanical and Power Systems (SIELMEN), 2017
Generally three phase motors are better than single phase motors but three phase system cannot be... more Generally three phase motors are better than single phase motors but three phase system cannot be used in many applications for house. Especially single phase motors are used in city centers because of structure of the single phase feeder system. In general, small powered single phase motors in the range of 0.18–1.5 kW are used in small workplaces, portable hand looms, homes, fans, kitchen equipment, vacuum cleaner, drills and etc. In this paper, characteristic performance features of the single phase electrical machines that named universal motors, single phase induction motors (IM), shaded pole motors and 24 V permanent magnet direct current (PMDC) motors are studied. These motors are grouped in special electrical machines. Operational principles of the motors, areas of the usages and performance characteristics are given comparatively. Tests are conducted for motors. Current, voltage, revolution per minute, powers are given in graphs. ANSYS Maxwell programme is used for computer ...
In this paper has investigated the chaos control scheme of Permanent Magnet Synchronous Motor usi... more In this paper has investigated the chaos control scheme of Permanent Magnet Synchronous Motor using Sliding Mode Control (SMC) method. In order to make control of chaos in permanent magnet synchronous motor system, its smooth air-gap model is examined. Sliding Mode Control method consists of two sections. To simplify the directive of the stability of the controlled permanent magnet synchronous motor in the sliding mode, firstly adopted a special type of PI switching surface. Secondly the SM Controller is obtained to guarantee the occurrence of the PI switching surface. The effectiveness of the theoretical analysis is evaluated by numerical simulations. Thus, Numerical results show that the proposed method is verify and trustworthy.
In this paper, the chaos control for the Gyroscope System is performed by using control methods b... more In this paper, the chaos control for the Gyroscope System is performed by using control methods based on sliding mode control and time-delay feedback control. The designed controllers for the complete chaos control of Gyroscope System are obtained using sliding mode control theory, Lyapunov stability theory and time-delayed feedback control theory. Since the Lyapunov exponents are not required for these calculations, the sliding mode control method is very effective and convenient to achieve chaos control of similar systems. In spite of its inherent limitations, Time Delayed Feedback Control can be applied successfully in many chaos control applications. So chaos control of the Gyroscope System is ensured completely by time delayed feedback control. Numerical simulations are presented to demonstrate the effectiveness and validate the chaos control of Gyroscope Systems.
In this paper is performed chaos control for the single-machine-infinite bus (SMIB) power system ... more In this paper is performed chaos control for the single-machine-infinite bus (SMIB) power system using control methods based on sliding mode control and passive adaptive control. The singlemachine-infinite bus (SMIB) power system creates chaotic oscillation when the amplitude of the power of the machine falls into a certain area. Designed the controllers for the complete chaos control of SMIB are obtained using sliding control theory, Lyapunov stability theory and passive adaptive control theory. Since the Lyapunov exponents are not required for these calculations, the sliding mode control method is very effective and convenient to achieve chaos control of similar systems. The designed passive controller which is introduced an adaptive law into to eliminate the influence of undeterministic parameter can be asymptotically stabilized at any desired fixed points. Numerical simulations are presented to demonstrate the effectiveness and validate the chaos control of the singlemachine-inf...
In this study, the most vital characteristic properties of induction motor, motor starting, maxim... more In this study, the most vital characteristic properties of induction motor, motor starting, maximum and nominal torque are analysed for what are affected. For the analysis of torque, L type, T type and IEEE 112 equivalent circuit model is employed. Torque change is investigated with the help of codes developed in MATLAB to be used in electrical machines II course. Such parameters as stator and rotor resistance, voltage, frequency, stator and rotor leakage reactance, the number of poles and slip are researched for how torque values are affected from. The obtained values for each of the three equivalent circuit models are given. 3 kW squirrel cage induction motor parameters are used in analysis. In the analysis, the most influential parameters on the starting torque are found as rotor resistance and stator and rotor leakage reactance. Change of other parameters’ impact ratio depending upon right proportion and inverse proportion is observed. When nominal torque variations are investig...
In this paper, particle swarm optimization (PSO) method is used to find the optimal control param... more In this paper, particle swarm optimization (PSO) method is used to find the optimal control parameters of FACTS (Flexible AC Transmission Systems) SVC (Static VAR Compensator) device. SVC is used for voltage and reactive power control in two machine transmission system with PSS (Power System Stabilizer). Simulations are implemented in MATLAB – Simulink. The main purpose of the study is to control the bus voltage deviations after fault. The differences between SVC with unoptimizated control parameters and optimizated control parameters are showed in this paper. Simulation results showed that SVC with optimal parameters is provided the minimum bus voltage deviations after fault.
In this study, the most vital characteristic properties of induction motor, motor starting, maxim... more In this study, the most vital characteristic properties of induction motor, motor starting, maximum and nominal torque are analyzed for what are affected. For the analysis of torque, L type, T type and IEEE 112 equivalent circuit model is employed. Torque change is investigated with the help of codes developed in MATLAB to be used in electrical machines course. First, the slip-moment characteristic curve of the induction motor is divided into three working zones and it was determined which equivalent circuit model gave the best results in these study zones. Later, such parameters as stator and rotor resistance, stator and rotor reactance, magnetization reactance, core resistance and slip are researched for how torque values are affected from. The obtained values for each of the three equivalent circuit models are given and compared with experimental results. 50 HP squirrel cage induction motor parameters are used in analysis. In the analysis, the most influential parameters on the starting torque are found as rotor resistance and stator and rotor reactance. Change of other parameters' impact ratio depending upon right proportion and inverse proportion is observed. When nominal torque variations are investigated, again rotor resistance is the most influential parameter and by selecting proper factor effecting rotor resistance during design, the result of acquiring desired rotor resistance is obtained. When the maximum torque variations are examined, it appears that the stator and rotor reactance values are effective. Starting, maximum and nominal torque expressions change with square of voltage alters the effect on them a lot. Therefore, triangle or star connection importance arises during machine design.
In this paper, the sliding mode control (SMC) scheme of single timescale brushless DC motor (BLDC... more In this paper, the sliding mode control (SMC) scheme of single timescale brushless DC motor (BLDCM) is investigated. The SMC method consists of 2 sections. To simplify the directive of the stability of the controlled single timescale BLDCM in the sliding mode, first a special type of PI switching surface is adopted. Second, the SMC controller is obtained to guarantee the occurrence of the PI switching surface. The effectiveness of the theoretical analysis is evaluated by numerical simulations. Thus, the numerical results are used to show the verification and trustworthiness of the proposed method.
Turkish Journal of Electrical Engineering and Computer Sciences, 2013
In this paper, the sliding mode control (SMC) scheme of single timescale brushless DC motor (BLDC... more In this paper, the sliding mode control (SMC) scheme of single timescale brushless DC motor (BLDCM) is investigated. The SMC method consists of 2 sections. To simplify the directive of the stability of the controlled single timescale BLDCM in the sliding mode, first a special type of PI switching surface is adopted. Second, the SMC controller is obtained to guarantee the occurrence of the PI switching surface. The effectiveness of the theoretical analysis is evaluated by numerical simulations. Thus, the numerical results are used to show the verification and trustworthiness of the proposed method.
Iranian Journal of Science and Technology-Transactions of Electrical Engineering, Jul 19, 2018
Solid oxide fuel cell (SOFC) provides several benefits such as high efficiency, modularity, quiet... more Solid oxide fuel cell (SOFC) provides several benefits such as high efficiency, modularity, quiet operation and cogeneration alternatives. Nevertheless, the main weakness in SOFC-based power plant has the slow dynamic response during transient situations in peak demand since this problem can be addressed by using complementary system such as a super-capacitor (SC). This paper provides an optimal load sharing and arrangement strategy (LSAS) for a hybrid power system which combines a SOFC stack, a SC module and a battery bank that support local grid. According to LSAS, the SOFC is the primary power source. The SC module is utilized as a backup and complement device to take care of the load following problems of SOFC during transient. The battery bank is added as a high energy density and/or backup device to stabilize the DC bus voltage, while an electrolyzer (ELYZ) is used as a dump load during surplus power. The LSAS operates in two layers. The external layer accomplished the overall power management system. Depending upon load demand, this layer generates references to the internal layer. The internal layer controls the individual subsystems, i.e., SOFC, ELYZ, SC and battery according to the references coming from the external layer. A complete MATLAB/Simulink model has been established to check the performance of the proposed system for the real load conditions. Simulation results show the effectiveness of the proposed system in terms of power transfer, load tracking and grid stability.
In this paper, a new maximum power point tracking (MPPT) method based on the Fibonacci search alg... more In this paper, a new maximum power point tracking (MPPT) method based on the Fibonacci search algorithm (FSA) is proposed for the wind energy conversion system (WECS). The conventional FSA is modified according to the requirements of the WECS to improve its performance as an MPPT algorithm. The performance of the proposed method is investigated for different wind-speed profiles such as step-type and stochastically varied wind speed. Also, the modified FSA based MPPT algorithm is compared with the conventional perturb and observe (CPO) and variable-step PO (VSPO) algorithms. The simulation results approve the superior performance of the proposed method over the CPO and VSPO in terms of maximum power extracted from the system. The real-time performance of the proposed method is also investigated for varying wind conditions in the form of step-up and step-down.
In this study, a new single-state sliding mode controller is proposed that can be used in multi-i... more In this study, a new single-state sliding mode controller is proposed that can be used in multi-input dynamic systems that require the system dynamics to be controlled by a single state variable. The proposed controller is compared with the single state sliding mode controller, which is effective according to a linear feedback controller and a passive controller. To demonstrate the effectiveness of the controllers, the model WINDMI, which is defined as a complex driven damped dynamic system, is preferred as an exemplary model. For the system's dynamics to reach reference in the shortest settling time with minimum overshoot, the sliding surface coefficient and the controller coefficients are optimized according to the sliding surface using Particle Swarm Optimization, Genetic Algorithm, and Pattern Search algorithm. The best values of optimization coefficients are determined by comparing the obtained results. Finally, verifying the effectiveness and reliability of the proposed controller is demonstrated with simulations and numerical analysis.
Bu tezin, veri tabanı üzerinden yayınlanma izni bulunmamaktadır.ÖZET Anahtar Kelimeler: Veri topl... more Bu tezin, veri tabanı üzerinden yayınlanma izni bulunmamaktadır.ÖZET Anahtar Kelimeler: Veri toplama sistemi, analog dijital çevirici, ADC, Örnekleme - tutma, kodlama, haberleşme protokolleri, RS232, paralel port, seri port, Günümüzde elektriksel işaretler fiziksel sistemlere ilişkin birçok bilgi içerir. Bu bilgilerin yeterli doğrulukta analiz edilebilmesi için, fiziksel büyüklüklere ilişkin analog sinyallerin uygun işlenip, istenilen örnekleme aralıklarında dijitale çevrilerek analiz için kullanışlı bir formatta depolanması gerekir, ölçme ve veri toplama sistemlerinin önemi büyüktür, zira hatalı elde edilmiş verilerden yeterince doğru sonuçlar çıkarmak imkansızlaşır. Günümüzde veri toplama sistemleri hem çok pahalı ve hem de çeşitli esneklik sorunları sürmektedir. Sistemde veri toplama kartı ayrıca ele alınırsa, çözünürlükten kaynaklanan hatalar ve dijitale çevrilen bilginin örnekleme frekansının esnek seçilebilirliği ana parametreleri teşkil etmektedir. Ayrıca dijital bilginin bil...
2017 International Conference on Electromechanical and Power Systems (SIELMEN), 2017
The rotating magnetic field is the major concept of induction and synchronous machines. For a thr... more The rotating magnetic field is the major concept of induction and synchronous machines. For a three phase induction motor, locus of net magnetic field of single winding stator is a circle which radius is equal to 3/2 times of one phase's magnetic field peak value. This paper introduces the locus diagram the net magnetic field of Dual Winding Induction Motor (DWIM). One of the stator winding is fed from a different frequency while the other one is fed with nominal frequencies. Hence the different rotating magnetic field speeds (synchronous speeds) are obtained by individual windings. Locus diagrams are obtained with different frequencies. This diagrams obtained for different frequencies are same as petaled flower that is a famous mathematical curve in polar coordinates. The total rotating magnetic field variations obtained in this way will affect the torque values obtained at the motor shaft.
2016 International Conference on Emerging Technologies (ICET), 2016
Applications of PHEV have been observed as popular in transportation sector, but, an uncoordinate... more Applications of PHEV have been observed as popular in transportation sector, but, an uncoordinated charging of PHEV poses an extra load during peak times which brings up many technical problems in which durability of power system occurs first. Considering PHEV to stay for several hours in the parking lot may offer a unique opportunity to charge PHEV from photovoltaic power in those hours. The proposed charging facility is working under smart charging scheduling paradigm, which is independent from forecasting models of PHEVs charging. The proposed paradigm schedules of PHEV is in an optimal way based on two parameters i.e., priority levels of PHEVs charging, and variations in DC link voltage level. Furthermore, the priorities of PHEV charging are based on their power demand, maximum rating of distribution transformer and stay duration of PHEVs in the parking lot during high irradiation of solar effect. The sensing of proposed paradigm is based on change in DC link voltage. The DC link voltage changes due to variance in solar irradiance, temperature and real-time residential load. Such priorities are updated whenever smart charging scheduling paradigm detects changes in voltage and initiate/terminate PHEVs charging. Simulation results express the effectiveness of proposed charging station effectively.
International Journal of Applied Mathematics Electronics and Computers, 2019
3-phase induction motors are widely used in industrial applications such as pumps, blowers, compr... more 3-phase induction motors are widely used in industrial applications such as pumps, blowers, compressors, conveyors, etc. In addition, single-phase motors also have domestic use. For this reason, the design of the induction motor is of great importance. During the design, according to the parameters given as input, there are many situations that are contradictory to each other in order to achieve the goal. For example, if high efficiency is required, the motor size and the price will increase, and if lower price is required, other performance characteristics should be ignored. In the practical design of an induction motor, the designer has to comply with a number of constraints because of the large number of input variables. For this reason manual calculation becomes a very long and difficult process. To overcome this tiresome process, it is necessary to create a computer aided program or simulation model to determine the induction motor design parameters. In induction motor design, many parameters directly affect motor performance. Therefore, the selection of these parameters is of great importance. The output coefficient (C0), which takes place in the first steps of the design process, also has a great influence on the motor design. In this paper, a program for optimizing design of 3-phase induction motors written in MATLAB is presented. The structure of the program is modular and therefore can be modified for the various requirements of the induction motor design. C0 constant, one of the design parameters, also varies with some other parameters. The most important ones are the specific electrical loading coefficient (A1) and the specific magnetic loading coefficient (Bav), making dramatic effect on the output coefficient. The effect of the variation of the C0 constant on the performance of the induction motor was investigated in the study. Stator inner and outer diameter, stack length, stator and rotor slot parameters, equivalent circuit parameters, losses and efficiency was obtained according to the change of Bav and A1 values. The obtained results are given and interpreted in tables and graphs.
In this study, a new reaching rule in the Sliding Mode Control (SMC) is proposed for chaos contro... more In this study, a new reaching rule in the Sliding Mode Control (SMC) is proposed for chaos control and synchronization. It is applied on the nonlinear Chua's circuit. The SMC signals are provided with the Lyapunov stability theory. Classical, cubic and partial cubic variants of SMC signals are constructed. Numerical simulations are performed to compare the effectiveness of the SMC signals and the results are discussed.
Iranian Journal of Science and Technology, Transactions of Electrical Engineering, 2018
Solid oxide fuel cell (SOFC) provides several benefits such as high efficiency, modularity, quiet... more Solid oxide fuel cell (SOFC) provides several benefits such as high efficiency, modularity, quiet operation and cogeneration alternatives. Nevertheless, the main weakness in SOFC-based power plant has the slow dynamic response during transient situations in peak demand since this problem can be addressed by using complementary system such as a super-capacitor (SC). This paper provides an optimal load sharing and arrangement strategy (LSAS) for a hybrid power system which combines a SOFC stack, a SC module and a battery bank that support local grid. According to LSAS, the SOFC is the primary power source. The SC module is utilized as a backup and complement device to take care of the load following problems of SOFC during transient. The battery bank is added as a high energy density and/or backup device to stabilize the DC bus voltage, while an electrolyzer (ELYZ) is used as a dump load during surplus power. The LSAS operates in two layers. The external layer accomplished the overall power management system. Depending upon load demand, this layer generates references to the internal layer. The internal layer controls the individual subsystems, i.e., SOFC, ELYZ, SC and battery according to the references coming from the external layer. A complete MATLAB/Simulink model has been established to check the performance of the proposed system for the real load conditions. Simulation results show the effectiveness of the proposed system in terms of power transfer, load tracking and grid stability.
2017 International Conference on Electromechanical and Power Systems (SIELMEN), 2017
Generally three phase motors are better than single phase motors but three phase system cannot be... more Generally three phase motors are better than single phase motors but three phase system cannot be used in many applications for house. Especially single phase motors are used in city centers because of structure of the single phase feeder system. In general, small powered single phase motors in the range of 0.18–1.5 kW are used in small workplaces, portable hand looms, homes, fans, kitchen equipment, vacuum cleaner, drills and etc. In this paper, characteristic performance features of the single phase electrical machines that named universal motors, single phase induction motors (IM), shaded pole motors and 24 V permanent magnet direct current (PMDC) motors are studied. These motors are grouped in special electrical machines. Operational principles of the motors, areas of the usages and performance characteristics are given comparatively. Tests are conducted for motors. Current, voltage, revolution per minute, powers are given in graphs. ANSYS Maxwell programme is used for computer ...
In this paper has investigated the chaos control scheme of Permanent Magnet Synchronous Motor usi... more In this paper has investigated the chaos control scheme of Permanent Magnet Synchronous Motor using Sliding Mode Control (SMC) method. In order to make control of chaos in permanent magnet synchronous motor system, its smooth air-gap model is examined. Sliding Mode Control method consists of two sections. To simplify the directive of the stability of the controlled permanent magnet synchronous motor in the sliding mode, firstly adopted a special type of PI switching surface. Secondly the SM Controller is obtained to guarantee the occurrence of the PI switching surface. The effectiveness of the theoretical analysis is evaluated by numerical simulations. Thus, Numerical results show that the proposed method is verify and trustworthy.
In this paper, the chaos control for the Gyroscope System is performed by using control methods b... more In this paper, the chaos control for the Gyroscope System is performed by using control methods based on sliding mode control and time-delay feedback control. The designed controllers for the complete chaos control of Gyroscope System are obtained using sliding mode control theory, Lyapunov stability theory and time-delayed feedback control theory. Since the Lyapunov exponents are not required for these calculations, the sliding mode control method is very effective and convenient to achieve chaos control of similar systems. In spite of its inherent limitations, Time Delayed Feedback Control can be applied successfully in many chaos control applications. So chaos control of the Gyroscope System is ensured completely by time delayed feedback control. Numerical simulations are presented to demonstrate the effectiveness and validate the chaos control of Gyroscope Systems.
In this paper is performed chaos control for the single-machine-infinite bus (SMIB) power system ... more In this paper is performed chaos control for the single-machine-infinite bus (SMIB) power system using control methods based on sliding mode control and passive adaptive control. The singlemachine-infinite bus (SMIB) power system creates chaotic oscillation when the amplitude of the power of the machine falls into a certain area. Designed the controllers for the complete chaos control of SMIB are obtained using sliding control theory, Lyapunov stability theory and passive adaptive control theory. Since the Lyapunov exponents are not required for these calculations, the sliding mode control method is very effective and convenient to achieve chaos control of similar systems. The designed passive controller which is introduced an adaptive law into to eliminate the influence of undeterministic parameter can be asymptotically stabilized at any desired fixed points. Numerical simulations are presented to demonstrate the effectiveness and validate the chaos control of the singlemachine-inf...
In this study, the most vital characteristic properties of induction motor, motor starting, maxim... more In this study, the most vital characteristic properties of induction motor, motor starting, maximum and nominal torque are analysed for what are affected. For the analysis of torque, L type, T type and IEEE 112 equivalent circuit model is employed. Torque change is investigated with the help of codes developed in MATLAB to be used in electrical machines II course. Such parameters as stator and rotor resistance, voltage, frequency, stator and rotor leakage reactance, the number of poles and slip are researched for how torque values are affected from. The obtained values for each of the three equivalent circuit models are given. 3 kW squirrel cage induction motor parameters are used in analysis. In the analysis, the most influential parameters on the starting torque are found as rotor resistance and stator and rotor leakage reactance. Change of other parameters’ impact ratio depending upon right proportion and inverse proportion is observed. When nominal torque variations are investig...
In this paper, particle swarm optimization (PSO) method is used to find the optimal control param... more In this paper, particle swarm optimization (PSO) method is used to find the optimal control parameters of FACTS (Flexible AC Transmission Systems) SVC (Static VAR Compensator) device. SVC is used for voltage and reactive power control in two machine transmission system with PSS (Power System Stabilizer). Simulations are implemented in MATLAB – Simulink. The main purpose of the study is to control the bus voltage deviations after fault. The differences between SVC with unoptimizated control parameters and optimizated control parameters are showed in this paper. Simulation results showed that SVC with optimal parameters is provided the minimum bus voltage deviations after fault.
In this study, the most vital characteristic properties of induction motor, motor starting, maxim... more In this study, the most vital characteristic properties of induction motor, motor starting, maximum and nominal torque are analyzed for what are affected. For the analysis of torque, L type, T type and IEEE 112 equivalent circuit model is employed. Torque change is investigated with the help of codes developed in MATLAB to be used in electrical machines course. First, the slip-moment characteristic curve of the induction motor is divided into three working zones and it was determined which equivalent circuit model gave the best results in these study zones. Later, such parameters as stator and rotor resistance, stator and rotor reactance, magnetization reactance, core resistance and slip are researched for how torque values are affected from. The obtained values for each of the three equivalent circuit models are given and compared with experimental results. 50 HP squirrel cage induction motor parameters are used in analysis. In the analysis, the most influential parameters on the starting torque are found as rotor resistance and stator and rotor reactance. Change of other parameters' impact ratio depending upon right proportion and inverse proportion is observed. When nominal torque variations are investigated, again rotor resistance is the most influential parameter and by selecting proper factor effecting rotor resistance during design, the result of acquiring desired rotor resistance is obtained. When the maximum torque variations are examined, it appears that the stator and rotor reactance values are effective. Starting, maximum and nominal torque expressions change with square of voltage alters the effect on them a lot. Therefore, triangle or star connection importance arises during machine design.
In this paper, the sliding mode control (SMC) scheme of single timescale brushless DC motor (BLDC... more In this paper, the sliding mode control (SMC) scheme of single timescale brushless DC motor (BLDCM) is investigated. The SMC method consists of 2 sections. To simplify the directive of the stability of the controlled single timescale BLDCM in the sliding mode, first a special type of PI switching surface is adopted. Second, the SMC controller is obtained to guarantee the occurrence of the PI switching surface. The effectiveness of the theoretical analysis is evaluated by numerical simulations. Thus, the numerical results are used to show the verification and trustworthiness of the proposed method.
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