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This paper investigates the control of the continuous time Rabinovich chaotic system with the sliding mode control method. Based on the properties of the sliding mode theory, the controllers are designed and added to the nonlinear Rabinovich system. Numerical simulations show that the Rabinovich chaotic system can be regulated to its equilibrium points in the state space by using the sliding mode controllers, which verifies all the theoretical analyses. Simulation results of the proposed sliding mode control strategy have been also compared with the passive control method, and their performances are discussed. Copyright (c) 2013 John Wiley & Sons, Ltd.

This paper deals with the control of the memristor-based simplest chaotic circuit by means of only one-state controller. Three distinct control techniques, namely linear feedback control, sliding mode control, and nonlinear control, are examined for the control. Routh–Hurwitz stability criteria are used for constructing the linear feedback and sliding mode gains. Lyapunov function is used for ensuring the global asymptotic stability of the system with the nonlinear controller. Numerical simulations are demonstrated not only to validate the theoretical analyses, but also to compare the control results. They have shown that even if one-state controller is used, all the methods are effective for controlling the memristor-based simplest chaotic circuit. However, the control is observed in a better time period with the sliding mode controller.

Sanayileşen ve küreselleşen dünyanın, enerji tüketimi gün geçtikçe artmaktadır. Dünya enerjiihtiyacının büyük çoğunluğunu önceleri fosil yakıtlarından sağlanmaktaydı. Ancak bu tür enerjikaynaklarının gün geçtikçe tükenecek olması, enerji ihtiyacını karşılamayacağı endişesi ve çevre dostu olmaması sebebiyle alternatif enerji kaynaklarına yönelim artmıştır. Bu alternatif enerji kaynakları arasından yenilenebilir enerji kaynakları, temiz, çevre dostu ve sürekli olmasından dolayı insanoğlu bu kaynakları kullanmaya yönelmiştir. En önemli yenilenebilir enerji kaynakları olan güneş, rüzgâr, biokütle, jeotermal, hidrolik, dalga vb. gibi kaynaklar kullanılmaya başlanılmıştır. Bu kaynaklardan en önemlisi olan güneş enerjisi son yıllarda yaygın olarak kullanılan yenilebilir enerji kaynaklarının başında gelir. Güneşten elektrik enerjisi elde etmek için güneş panelleri kullanılır. Güneş panellerinden en iyi şekilde verim elde etmek için çeşitli yöntemler kullanılır. Bu yöntemlerden bir tanesi de güneş takip sistemleridir. Bu tez çalışmasında, iki eksenli bir güneş takip sistemi ile sabit bir sistem düzeneği deneysel olaraktasarlanmıştır. Hareketli düzenek hem iki eksende hem de tek eksende güneş takibi yapabilen bir sistem olarak tasarlanmıştır. Ayrıca deneysel olarak tasarlanan sistemin tüm parçaları Matlab/Simulink ortamında modellenmiştir. Deneysel düzenekte bulunan hareketli ve sabit panelden iki ayrı günde alınan ölçümlerle karşılaştırma yapılarak verimlilik analizleri yapılmıştır. Birinci ve ikinci güne ait karşılaştırma sonucundaki verilere göre hareketli sistem sabit sisteme göre daha verimli olduğu tespit edilmiştir. Hareketli sistemin sabit sisteme göre birinci günde ve ikinci günde sırasıyla % 37,234 ve % 35,756 daha verimli olduğu tespit edilmiştir. Dolayısıyla hareketli sistemlerin sabit sistemlere göre % 35-40 arası daha verimli olduğu sonucuna varılmıştır. Matlab/ Simulink ortamında modellemesi yapılan hareketli sistem ile sabit sistemin deneysel ve benzetim sonuçlarının karşılaştırılması yapılmıştır. Karşılaştırma sonucunda deneysel ile benzetim sonuçlarının büyük ölçüde örtüştüğü gözlemlenmiştir. Böylelikle deneysel düzenek kurulmadan, değişen çevresel ve fiziksel faktörler altında benzetim ortamında benzetim modeli ile analiz yapılması mümkün kılınmıştır. Energy consumption of industrialized and globalized world has been increasing day by day. Vastmajority of world's energy need were provided by fossil fuels. However, the tendency to alternative energy sources has increased due to the fact that such energy sources will be exhausted, and they are not meeting energy need apprehension, and also they are not-so-eco. As these renewable energy sources are clean, eco-friendly, and sustainable among the other energy sources, mankind tend to use these sources. The most important renewable energy sources such as sun, wind, biomass, geothermal, hydraulic, waves have been started to use. To be the most important source among them, solar energy has been the most used primary energy in recent years. In this way, solar panels are used to obtain electrical energy from the sun. Various methods are used to achieve optimal efficiency from the solar panels. One of these methods is solar tracking system. In this thesis study, a dual axis solar tracking and a fixed panel system has been designed for an experimental purpose. The designed tracking system has been designed that could tracking the sun in both dual axis and single axis. Each part of the experimentally designed system has been modeled in Matlab/Simulink environment. The productivity analysis has been made by comparing the measurements which was taken in two different days from the tracking and fixed panel in the experimental setup. According to the result of the comparison of the first and second day, it is determined that tracking system is more efficient than fixed system. It is determined that the tracking system %37,234 and %35,756 more efficient than fixed system on the first day and second day respectively. Therefore, it is concluded that thetracking system % 35-40 more efficient than fixed system. Tracking system and fixed system which wasmodeled in Matlab/Simulink, has been compared by their experimental and simulation results. As a result of the comparison, it was observed that the modeling and real data results majorly overlap with each other. The simulation model enables to make analysis under varying environmental and physical factors in the simulation environment instead of experimental setup. 112

In this study, the control of hyperchaotic Rabinovich system is applied by using three different single state controllers, namely linear feedback, sliding mode, and passive control. Routh-Hurwitz criterions are used for constructing the sufficient conditions of the linear feedback controller. An appropriate switching surface is designed based on the sliding mode control theory. In order to ensure the global asymptotic stability of the system with the passive controller, a Lyapunov function is used. Simulation results are demonstrated not only to validate all the theoretical analyses but also to compare the effectiveness of proposed control methods. By adding the controllers to the hyperchaotic Rabinovich system, it asymptotically stabilizes towards its zero equilibrium point in the state space. Numerical simulations have also shown that the proposed single state sliding mode controller is more effective than linear feedback and passive controllers on the control of hyperchaotic Rabinovich system. (C) 2016 Elsevier GmbH. All rights reserved.

In this study, in order to control the voltage of theWestern System Coordinating Council (WSCC) system, asliding mode control has been used. First, the active andreactive power values, voltage and angle values of the loadbuseshave been calculated. The load-buses which their voltagelevels are lower than 1 pu has been identified. After that, byconsidering one of these load-buses, the system is transformedto the system with two load-buses and the sliding mode controlmodel has been obtained. The sliding mode parameters havebeen obtained by using genetic algorithm (GA) optimizationtechnique. From the results of simulations of this model, it isshown that the voltage of the load-buses reaches at 1 pu with avery low error. DOI: http://dx.doi.org/10.5755/j01.eee.19.4.1580