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Open Access Article
1 - STATCOM controller design with using of improved robust backstepping algorithm based on PSO to reduce large signal disturbances in power systems
Fariborz Haghighatdar Fesharaki Alireza HaghshenasIn this paper, in order to reduce disturbance attenuation in the single-machine infinite-bus system a STATCOM by an improved robust back-stepping algorithm based on a particle swarm optimization approach is proposed. In the proposed approach, the adaptive back-stepping MoreIn this paper, in order to reduce disturbance attenuation in the single-machine infinite-bus system a STATCOM by an improved robust back-stepping algorithm based on a particle swarm optimization approach is proposed. In the proposed approach, the adaptive back-stepping method is used to construct the storage function to reduce internal and external disturbances. Also, a nonlinear controller with interference rejection feature and update of the nonlinear parameter substitution law are applied simultaneously. In this research, in order to maintain non-linearities feature, the real-time estimation of uncertain parameters, ensure robustness and insensitivity to large disturbances of the STATCOM system, the adaptive back-stepping sliding mode control method is applied in terms of error compensation design. It should be noted that the proposed controller has a large number of design parameters which affect its efficiency and performance. So, here the particle swarm optimization approach is used to determine the design parameters based on the cost function of the integral of the magnitude of the error. Finally, the simulation results are performed by MATLAB software, confirmed the better performance of the proposed optimal back-stepping sliding mode control method compared to traditional adaptive back-stepping in terms of the speed of adaptation and the response of the STATCOM system. Manuscript profile -
Open Access Article
2 - A New 2-input CNTFET-Based XOR Cell With Ultra-Low Leakage Power For Low-Voltage and Low-Power Full Adders
Amir Baghi Rahin Vahid Baghi RahinThe XOR gate is one of the basic building blocks in the Full Adder (FA) circuit, whose performance improvements can lead to improved Full Adder. For this purpose, in this paper, a new low voltage XOR cell based on Carbon Nanotube Field Effect Transistor (CNTFET) is prop MoreThe XOR gate is one of the basic building blocks in the Full Adder (FA) circuit, whose performance improvements can lead to improved Full Adder. For this purpose, in this paper, a new low voltage XOR cell based on Carbon Nanotube Field Effect Transistor (CNTFET) is proposed. The main design goals for this new circuit are low power dissipation, low leakage current and full voltage swing at a low supply voltage (Vdd = 0.5 V). Several XOR circuits were completely simulated using HSPICE with 32nm CMOS and 32nm CNTFET technologies at a low supply voltage. The proposed XOR circuit is compared with the previously known circuits and its outstanding performance is shown. Simulations show that the new low voltage XOR has lower power dissipation, less leakage current and lower PDP than other XOR circuits, and is resistant to process variations. Based on the results obtained at Vdd=0.5 V ,frequency=250 MHz and Cload=3.5 fF, the proposed XOR shows propagation delay of 149.05 ps, power consumption of 716.72 pW, leakage power of 25.1 pW and PDP of 10.683x10-21 J. The proposed XOR can be used well in low voltage and low power Full Adder circuits. Manuscript profile -
Open Access Article
3 - Design and Simulation of a 20-Watt Doherty Power Amplifier at a frequency of 2.14 GHz for wireless communication systems
Shaban Rezaei Borjlu Hossein AlibagheriIn this study, a symmetrical doherty power amplifier was designed and simulated at a frequency of 2.14 GHz with high power added efficiency and output power of 20-watts. Doherty Power Amplifier generally consist of two separate power amplifiers. The main power amplifier MoreIn this study, a symmetrical doherty power amplifier was designed and simulated at a frequency of 2.14 GHz with high power added efficiency and output power of 20-watts. Doherty Power Amplifier generally consist of two separate power amplifiers. The main power amplifier enhancer is designed and developed in the AB class. Auxiliary power amplifier is designed in class C. To divide the power between the two amplifiers equally, a symmetric Wilkinson power distribution is used. Finally, using a load modulation method, a suitable power coupler is designed and simulated to combine the proper output of two amplifiers. Using the MRFG351010 transistor as an active component with GaAs-pHEMT technology, the maximum output power of 20-watts is achieved at a maximum output of 65.46% and power gain of 8.56dB. The maximum output power and power added efficiency in the saturation region of the transistor with 6dB output back off (OBO) is 36dBm and 25.3%, respectively. Manuscript profile -
Open Access Article
4 - Insulin drug regulation by general type 2 fuzzy controller with alpha plane
Shima Nasr Hamid MahmoodianInsulin therapy with an insulin pump for diabetic patients has different challenges in the real world. Physiological uncertainties in human bodies, different types of daily activities are the most important challenges in this field. Besides, delay in CHO effects in bloo MoreInsulin therapy with an insulin pump for diabetic patients has different challenges in the real world. Physiological uncertainties in human bodies, different types of daily activities are the most important challenges in this field. Besides, delay in CHO effects in blood glucose may increase the risk of hypoglycemic and hyperglycemic. In this paper, general type 2 fuzzy controller with alpha-plane has been used to handle the uncertainties and a neural network predictor to estimate the blood glucose in next hour as well. Genetic algorithm is also used to tune some free parameters in the controller. in addition, Fuzzy rules have been weighted by predefined values based on the prediction of the amount of glucose in one hour late. in such case, rule weighting has been adjusted according to the glucose of the body which in turn two high risk situations of diabetic patients (hyperglycemia and hypoglycemia) have been considered in fuzzy inference. the Simulation results on Hovorka model shows that the controller can regulate the blood glucose in the existence of uncertainty in model and CHO regimen without the risk of hypoglycemic and hyperglycemic situations. Manuscript profile -
Open Access Article
5 - Sensorless Estimation of Battery Internal Temperature Using Dual Extended Kalman Filter
Mohseh Gholamrezaei Mohammad Toloo AskariAbstract: The conventional approaches for estimating internal battery temperature use numerical electric-thermal models in which a temperature sensor is required. In order to ensure safe and proper use of lithium-ion batteries during operation, accurate estimation of ba MoreAbstract: The conventional approaches for estimating internal battery temperature use numerical electric-thermal models in which a temperature sensor is required. In order to ensure safe and proper use of lithium-ion batteries during operation, accurate estimation of battery temperature is very important. In this paper, a method for estimating the surface and core temperature of the battery cell is presented using a coupled thermal model with an electrical impedance model without direct measurement of surface temperature. For this purpose, a dual extended Kalman filter (DEKF) consisting of a reduced thermal model along with battery current, voltage and impedance measurement can accurately estimate the temperature of the battery surface and core. The performance of the method is demonstrated experimentally on a 2.3-Ah lithium-ion iron phosphate cell fitted with surface and core thermo-couples for validation. The performance of the method is demonstrated experimentally on a 2.3-Ah lithium-ion iron phosphate cell fitted with surface and core thermo-couples for validation Manuscript profile -
Open Access Article
6 - Reducing the impact of SYN flood attacks by improving the accuracy of the PSO algorithm by adaptive effective filters
Mohammad Momeny Sorayya Gharravi Fateme HouraliTCP connection management is susceptible to a classic attack called SYN-flooding. In this attack, the source sends a large number of SYN segments to the victim system, without completing the third step of the three-step handshaking algorithm. This lead to consuming the MoreTCP connection management is susceptible to a classic attack called SYN-flooding. In this attack, the source sends a large number of SYN segments to the victim system, without completing the third step of the three-step handshaking algorithm. This lead to consuming the resources allocated to communicate with under attack system and bandwidth of the network quickly and, as a result, system cannot continue to work and engage in unnecessary requests. This paper models the attacked system using quadratic theory and maps the problem of defense against SYN-flooding attacks into an optimization problem. Then, using an effective adaptive filter combination with the PSO algorithm, it presents its proposed method and solves this problem. The simulation results show that the proposed defense mechanism has a significant performance in terms of the amount of blocked requests, the likelihood of success in communication, the likelihood of success of the attacker, and the optimal use of the dedicated buffer. Manuscript profile
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