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Gerilim kaynaklı dönüştürücülere (VSC) dayalı yüksek gerilim-doğru akım (HVDC) güç sistemleri son yıllarda popüler bir konu haline gelmiştir. Bu makale, zayıf bir AC sistemi için çeşitli sistem hataları ve aşırı yükleme koşulları altında... more
Gerilim kaynaklı dönüştürücülere (VSC) dayalı yüksek gerilim-doğru akım (HVDC) güç sistemleri son yıllarda popüler bir konu haline gelmiştir. Bu makale, zayıf bir AC sistemi için çeşitli sistem hataları ve aşırı yükleme koşulları altında vektör kontrol tekniği ile VSC tabanlı bir VSC-HVDC sisteminin bir modelini ve kontrol performansını incelemektedir. VSC-HVDC sisteminin matematiksel modeli, sistem parametrelerini en uygun şekilde ayarlamak için kontrol edilen ve kontrol edilen değişkenlerin bir simülasyon modelini ilişkilendirmemize izin verir. Bu nedenle, DC bara gerilimini korumak amacıyla aktif ve reaktif gücü ayarlamak için uygun bir vektör kontrol tekniği kullanılır. Bu makalede sunulan kontrol sistemi, sistem salınımını verimli bir şekilde söndürebilen ve sistem geçici ve kararlı durum kararlılığını sürdürebilen dış kontrol döngüsü ve iç kontrol döngüsünü içerir. Vektör kontrol yaklaşımı, zayıf bir 6 baralı AC iletim sisteminde test edilmiştir. Modelin verimliliğini ve kontr...
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Research Interests: Mathematics, Power System, Multidisciplinary, Dynamic Analysis, Applied, and 13 moreApplied Sciences, Voltage Stability, Oscillations, Electric Power System, Mathematical Model, Constant Time Delay, Dynamic Loading, Dynamic Model of WSN, Voltage Collapse, Tap Changer, Voltage Control, dynamic model, and Chaotic
An electric power system shows a chaotic behavior on an interval of loading state. Another type of system instability is voltage collapse, when the system is too loaded. Voltage stability of a power system is related to load... more
An electric power system shows a chaotic behavior on an interval of loading state. Another type of system instability is voltage collapse, when the system is too loaded. Voltage stability of a power system is related to load characteristics and voltage control devices ...
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In this study, an online Artificial Neural Networks based Pole Placement algorithm is proposed to stabilize the 2-bus system with nonlinear SVC and variable power. It uses pole placement method. Proposed algorithm are examined in point of... more
In this study, an online Artificial Neural Networks based Pole Placement algorithm is proposed to stabilize the 2-bus system with nonlinear SVC and variable power. It uses pole placement method. Proposed algorithm are examined in point of improving the bus voltages which change under different demanding powers and the temporary state performance are compared with PID control based results. Simulation results demonstrate a good performance and robustness. Streszczenie. W artykule zaprezentowano online algorytm Pole Placement z wykorzystaniem sieci neuronowych do stabilizacji dwu-szynowego systemu z nieliniowym, SVC (Static Var Compensator) i zmienną mocą. (Sterowanie SVC przy wykorzystaniu algorytmu Poler Placement i sieci neuronowych)
Bir elektrik guc sistemi farkli karakteristildere sahip yuklerden olusmaktadir. Yuk kar akteristiginin sistem dinamigi uzerinde onemli bir etkiye sahip oldugu bilinmektedir .Guc sistemlerindeki gerilim kararldigi ozellikle yuk... more
Bir elektrik guc sistemi farkli karakteristildere sahip yuklerden olusmaktadir. Yuk kar akteristiginin sistem dinamigi uzerinde onemli bir etkiye sahip oldugu bilinmektedir .Guc sistemlerindeki gerilim kararldigi ozellikle yuk karakteristiklerine baglidir. Gerilim kararldigi analizlerinde, yuklerin karakteristiklerini ve davranislarani bilmek cok onemlidir. Enerji kalitesi genellikle lineer olmayan yukler tarafindan olumsuz bir bicimde etkilenir. Bu cahsmada gerilim degisimlerinin cesitli yukler uzerindeki etkileri incelenmistir
In this paper voltage stability is evaluated by both dynamic P-V curves and time-domain simulations, considering the dynamic control effects of a static var compensator (SVC) and under load tap changing (ULTC) transformer. The proposal in... more
In this paper voltage stability is evaluated by both dynamic P-V curves and time-domain simulations, considering the dynamic control effects of a static var compensator (SVC) and under load tap changing (ULTC) transformer. The proposal in this paper is to use ANN to prediction the ULTC tap ration and SVC susseptance of the voltage stabilty of power system. The objective of this paper is the determination of the critical loading points with bifurcation analysis using a neural network and the comparasion of the ULTC and SVC on the dynamical voltage stabilization. The simulation results and prediction values were obtained using the MATLAB/SIMULINK and NeuroXL prediction simulator respectively.
Research Interests: Engineering, Power System, Neural Network, Dynamic control, IEEE, and 13 moreReactive Power, Power system stability, Stability Analysis, Voltage Stability, Prediction Model, Critical Loads, Time Domain, Bifurcation Analysis, Artificial Neural Network, Predictive value of tests, Static VAR Compensator (SVC), Voltage Control, and Neural nets
In this paper, to improve voltage stability of the most critical bus of the New England 39 bus test system has proposed a new DC transmission line based on the VSC-HVDC (Voltage source converter-High Voltage Direct Current) instead of AC... more
In this paper, to improve voltage stability of the most critical bus of the New England 39 bus test system has proposed a new DC transmission line based on the VSC-HVDC (Voltage source converter-High Voltage Direct Current) instead of AC transmission line. The power transferred has been provided by the VSC-HVDC that have two steady state control modes to the critical bus. It is determined by the sensitivity analysis the most critical bus of the power system. In this bus the effect of heavy loading on long term voltage stability is investigated. In the modified test system for all situations, to improve of the voltage stability is determined the best suitable control strategy for the voltage source converters. Simulations are conducted in DIgSILENT Power Factory 15.0 software. The results of proposed test system compared and presented the base system that included AC transmission line.
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In this study, the penetration effect of wind generation on voltage stability in a weak multi machine power system has been investigated. In terms of static and dynamic voltage stability, the most critical bus of IEEE 10-machine 39-bus... more
In this study, the penetration effect of wind generation on voltage stability in a weak multi machine power system has been investigated. In terms of static and dynamic voltage stability, the most critical bus of IEEE 10-machine 39-bus system has been determined by using sensitivity analysis. The comparison has been made for various wind power penetration levels. It is shown if a large amount of wind power is integrated into power system, the system stability will be deteriorated. In the paper, a static synchronous compensators (STATCOM) is proposed to improve the stability. The calculations and simulations have been conducted by DIgSILENT Power Factory 15.0. Comparative simulation results show that the STATCOM can effectively increase voltage stability margin of the AC system which was considerably decreased due to wind power's penetration.
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Basic mechanical systems are usually considered to comprise of spring, damper and mass. This type of systems and components are used to modeling and analysis of many different mechanical systems, like car suspension and human body.... more
Basic mechanical systems are usually considered to comprise of spring, damper and mass. This type of systems and components are used to modeling and analysis of many different mechanical systems, like car suspension and human body. Mechanical systems are analyzed according to Newton's second law. Sliding mode control is a type of nonlinear control that can be applied on variable structure systems. Sliding mode control can be used in different electromechanic systems due to its effectiveness against system uncertainities and disruptive effects. Sliding mode control has two basic stages which are accession and sliding stages. PID controller is a classic control type that is used prevalent in control applications. It is preferred due to its eaisness of design and application. In this paper, modeling of mechanical systems, controlling with PID Controller and Sliding Mode Controller is discussed. Simulation results were obtained and compared with regard to different controller types ...
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In recent years, implementing renewable energy systems such as wind power systems into interconnected grids play a vital role in energy management and production. Besides the good aspects of this energy policy, there may be some... more
In recent years, implementing renewable energy systems such as wind power systems into interconnected grids play a vital role in energy management and production. Besides the good aspects of this energy policy, there may be some undesirable cases if not controlled. Increasing penetration of wind generation into the electricity grid negatively affects the power system stability and the required reactive power that might cause serious voltage stability problems. In order to overcome this problem, especially in the weakest areas of the system with respect to voltage stability, it is necessary to support the reactive power reserve. In this study, a coordinated ULTC–STATCOM controller has been designed to improve the reactive power reserve and enhance voltage stability by the penetration of wind power through the VSC-HVDC wind farm system into weak area of the AC system. The novelty of the proposed coordination control than the classical coordination approaches is changing the tap position of the ULTC especially at high penetration levels and thus to maintain the reactive power reserve of STATCOM. The proposed approach is tested in a two-bus sample system and adapted to the weakest area of the IEEE 10-machine 39-bus test system that simulations are conducted in DIgSILENT PowerFactory 15.0 software. Comparative simulation results show that the proposed approach has enhanced both reactive power reserve and voltage stability margin of the test systems.
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Optimal control of power converters to avoid voltage instability in cases such as system loading or faults is one of the most studied nonlinear problems that affect energy quality in power systems. The optimization problem related to... more
Optimal control of power converters to avoid voltage instability in cases such as system loading or faults is one of the most studied nonlinear problems that affect energy quality in power systems. The optimization problem related to converter control becomes more difficult with the inclusion of renewable energy systems while trying to fulfill power system constraints and providing an adequate amount of energy. In this paper, a simple approach based on artificial neural networks (ANNs) has been proposed and applied to photovoltaic-fed high-voltage DC and high-voltage AC systems interconnection consisting of PI-controlled power converters. By using the proposed method, converter control parameters are optimized for different cases to improve steady-state and dynamic voltage stability while also avoiding any kind of system faults. In order to implement hybrid control methodology by using ANN and PI control, the network should be well trained with samples including not only global best...
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Abstract In this paper, a simple and efficient nature inspired search method based on differential search algorithm (DSA) has been presented and used for optimal power flow (OPF) problem in power systems. By using the proposed DSA method,... more
Abstract In this paper, a simple and efficient nature inspired search method based on differential search algorithm (DSA) has been presented and used for optimal power flow (OPF) problem in power systems. By using the proposed DSA method, the power system parameters such as real power generations, bus voltages, load tap changer ratios and shunt capacitance values are optimized for the certain objective functions. Different types of single-objective and multi-objective functions on IEEE 9-bus, IEEE 30-bus and IEEE 57-bus power systems are used to test and verify the efficiency of the proposed DSA method. By comparing with several optimization methods, the results obtained by using the proposed DSA method are presented in detail. The results achieved in this work illustrate that the DSA method can successfully be used to solve the non-linear and non-convex problems related to power systems.
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Power flow studies, commonly known as load flow, form an important part of power system analysis. Power system buses are generally classified into three types. Slack bus known as slack or swing bus, is taken as reference where the... more
Power flow studies, commonly known as load flow, form an important part of power system analysis. Power system buses are generally classified into three types. Slack bus known as slack or swing bus, is taken as reference where the magnitude and phase angle of the voltage are specified. Slack buses in power systems are determined to be selected ones of among buses called PV buses. In this study, it is investigated how effect stability limits of the system selected different slack buses .
In this study, an online Artificial Neural Networks based Pole Placement algorithm is proposed to stabilize the 2-bus system with nonlinear SVC and variable power. It uses pole placement method. Proposed algorithm are examined in point of... more
In this study, an online Artificial Neural Networks based Pole Placement algorithm is proposed to stabilize the 2-bus system with nonlinear SVC and variable power. It uses pole placement method. Proposed algorithm are examined in point of improving the bus voltages which change under different demanding powers and the temporary state performance are compared with PID control based results. Simulation results demonstrate a good performance and robustness. Streszczenie. W artykule zaprezentowano online algorytm Pole Placement z wykorzystaniem sieci neuronowych do stabilizacji dwu-szynowego systemu z nieliniowym, SVC (Static Var Compensator) i zmienną mocą. (Sterowanie SVC przy wykorzystaniu algorytmu Poler Placement i sieci neuronowych) Introduction It is well known that shunt and series compensation can be used to improve the power system stability. With the improvement in current and voltage handling capabilities of power electronic devices that have allowed for the development of F...
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Basic mechanical systems are usually considered to comprise of spring, damper and mass. This type of systems and components are used to modeling and analysis of many different mechanical systems, like car suspension and human body.... more
Basic mechanical systems are usually considered to comprise of spring, damper and mass. This type of systems and components are used to modeling and analysis of many different mechanical systems, like car suspension and human body. Mechanical systems are analyzed according to Newton's second law. Sliding mode control is a type of nonlinear control that can be applied on variable structure systems. Sliding mode control can be used in different electromechanic systems due to its effectiveness against system uncertainities and disruptive effects. Sliding mode control has two basic stages which are accession and sliding stages. PID controller is a classic control type that is used prevalent in control applications. It is preferred due to its eaisness of design and application. In this paper, modeling of mechanical systems, controlling with PID Controller and Sliding Mode Controller is discussed. Simulation results were obtained and compared with regard to different controller types...
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ÖZET Son zamanlarda artan güç talebinden ve kesintisiz güç ihtiyacından dolayı güç sistemlerinin enterkonnekte bağlantıları genişlemektedir. Yeni teknolojilerin kullanımından dolayı güç sistemlerinin karmaşıklıkları artmaktadır. Güç... more
ÖZET Son zamanlarda artan güç talebinden ve kesintisiz güç ihtiyacından dolayı güç sistemlerinin enterkonnekte bağlantıları genişlemektedir. Yeni teknolojilerin kullanımından dolayı güç sistemlerinin karmaşıklıkları artmaktadır. Güç sistemlerinin enterkonnekte bağlantısında güç üretimi ve talebi arasındaki dengesizlikler generatörlerin senkronizasyonunu ve kararlılığını olumsuz yönde etkilemektedir. Güç sistemlerinde görülen bu salınımların sönümlenmesi ve sistemin dinamik kararlılığının iyileştirilmesi için uyartım sistemine destekleyici bir işaretin uygulanması gerekir.Güç sistem stabilizerleri (PSS) otomatik gerilim regülatörleri (AVR) ile birlikte güç sistem kararlılığını iyileştirebilmektedirler. Bu çalışma tek makineli sonsuz güçlü baraya bağlı senkron generatörün çeşitli tip uyartım sistemlerinde oluşan salınımları sönümlemede güç sistemi dengeleyicisinin performanslarını incelemektedir.
Bifurcation analysis is often used in power system voltage stability studies. Loadability limits of system are determined by determination of bifurcation point and then it is used in planning and control studies. In this study, dynamic... more
Bifurcation analysis is often used in power system voltage stability studies. Loadability limits of system are determined by determination of bifurcation point and then it is used in planning and control studies. In this study, dynamic voltage stability analysis of a power system that deviates from a stable equilibrium point has been realized by bifurcation analysis.
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Abstract: An electric power system shows a chaotic behavior on an interval of loading state. Another type of system instability is voltage collapse when the system is too loaded. Voltage-collapse can be simply described as not able to... more
Abstract: An electric power system shows a chaotic behavior on an interval of loading state. Another type of system instability is voltage collapse when the system is too loaded. Voltage-collapse can be simply described as not able to supply enough reactive power to the load bus. ...