Enhanced Current Comparison Based Domino for Design of Low Power Wide Fan-In Gates
M.
Asyaei
School of Engineering, University of Damghan, Damghan, Iran
author
text
article
2017
per
In this paper, a new domino circuit is proposed to reduce power consumption of wide fan-in gates without considerable speed degradation. In the proposed domino circuit technique, current of the pull-down network is compared with a reference current to generate the proper output voltage. In this way, voltage swing of the pull-down network can be decreased to reduce power consumption. Moreover, a transistor in diode configuration is employed in series with the pull-down network to decrease the sub-threshold leakage current and increase the noise immunity. Simulation of wide fan-in OR gates are performed using HSPICE simulator in a 90nm CMOS technology model. Simulation results demonstrate 39% power reduction and 2.1× noise-immunity improvement at the same delay compared to the standard domino circuit for 64-bit OR gates.
TABRIZ JOURNAL OF ELECTRICAL ENGINEERING
Faculty of Electrical & Computer Engineering
2008-7799
47
v.
1
no.
2017
1
10
https://tjee.tabrizu.ac.ir/article_5318_777ef0f3787b6c189dca6af55cff4e9b.pdf
Assessment of Smart Distribution System Response to Operating Characteristics of Plug-in Hybrid Electric Vehicles
J.
Aghaei
Faculty of Electrical and Electronics Engineering, Shiraz University of Technology, Shiraz, Iran
author
S. E.
Bagheri
Electrical Engineering Department, Technical University of Imam Reza, Mamasani, Iran
author
S.
Shafiee
Electrical Engineering Department, Technical University of Imam Reza, Mamasani, Iran
author
T.
Niknam
Faculty of Electrical and Electronics Engineering, Shiraz University of Technology, Shiraz, Iran
author
S. M.
Bagheri
Electrical Engineering Department, Islamic Azad University of Yasuj Branch, Yasuj, Iran
author
text
article
2017
per
In this paper a comprehensive and accurate study is proposed to investigate the PHEVs impact on residential distribution network. In order to evaluate the impact of PHEVs on distribution network, characteristics of PHEVs are accurately modeled. PHEVs characteristics including battery capacity, state of charge (SOC), and the amount of energy required for charging PHEVs. The proposed model is applied to a 33-bus system in order to evaluate and investigate the growth rate of PHEVs penetration levels on distribution network. Results demonstrate that the amount of peak load, loss, and peak to average ratio (PAR) increment due to PHEVs penetration growth. So, in order to reduce the peak load, loss, and PAR, demand response (DR) programs are proposed. Time of use (TOU) program is considered for performing demand response programs. Results depict that DR programs decrease the amount of peak load, loss, and PAR.
TABRIZ JOURNAL OF ELECTRICAL ENGINEERING
Faculty of Electrical & Computer Engineering
2008-7799
47
v.
1
no.
2017
11
20
https://tjee.tabrizu.ac.ir/article_5290_7e11b44a4c8ee842bb2cd2b2f9c937d1.pdf
Analysis of the Effect of Finite Circular Ground Plane on the Wire Monopole Antennas
D.
Basaery
Faculty of Electrical and Electronic Engineering, University of Malek-e-Ashtar, Tehran, Iran
author
S. M. J.
Razavi
Faculty of Electrical and Electronic Engineering, University of Malek-e-Ashtar, Tehran, Iran
author
S. H.
Mohseni Armaki
Faculty of Electrical and Electronic Engineering, University of Malek-e-Ashtar, Tehran, Iran
author
text
article
2017
per
In this paper, the effect of the finite ground plane on the antenna radiation pattern is analyzed and presented. The radiation pattern of simple wire monopoles and a blade-shaped meanderline monopole - that loaded with lumped elements and covers the 30-500MHz bandwidth - is calculated using the Geometrical Theory of Diffraction (GTD) and the Equivalent Edge Current (EEC) analytical methods. Results show that the GTD method loses its efficiency when the ground plane is small and the EEC Method results a more accurate far field pattern in this case.
TABRIZ JOURNAL OF ELECTRICAL ENGINEERING
Faculty of Electrical & Computer Engineering
2008-7799
47
v.
1
no.
2017
21
28
https://tjee.tabrizu.ac.ir/article_5307_4a5ffd4a6f72ddf02432f78d75ba7aa4.pdf
Position-based Energy-Efficient Data Forwarding Protocol for Visual Sensor Networks
M.
Parandeh
Faculty of Electrical and Computer Engineering, University of Tabriz, Tabriz, Iran
author
S. H.
Aghdasi
Faculty of Electrical and Computer Engineering, University of Tabriz, Tabriz, Iran
author
text
article
2017
per
Recently, Visual Sensor Networks (VSNs) consisting of camera nodes have emerged as a new class of wireless networks. Low-capability camera nodes have the ability to capture and transmit visual data cooperatively. VSNs realize many applications by relying on the achieved information from camera nodes and transmitting important data to a specific destination (Sink). Based on literature, many position-based routing protocols have been proposed for VSNs which consider application requirements and camera nodes characteristics. In most of these protocols, maintaining neighborhood information by sending periodic control messages increases energy consumption in camera nodes. There are a few protocols without using periodic control messages. However, they suffer from injection of redundant data to the network. In this paper, Energy-Efficient data Forwarding protocol (EEF) in VSNs is proposed. This protocol which is based on camera nodes’ positions, uses greedy forwarder selection method to forward data without exchanging periodic control messages and utilizes waiting time mechanism. Simulation results show that the EEF decreases injected redundant data to the network and has better balancing in energy consumption of camera nodes in comparison with the state-of-the-art protocols.
TABRIZ JOURNAL OF ELECTRICAL ENGINEERING
Faculty of Electrical & Computer Engineering
2008-7799
47
v.
1
no.
2017
29
38
https://tjee.tabrizu.ac.ir/article_5291_ccbbde7baaa7eea6a8a74984b11b83d2.pdf
Inter-Area Oscillation Damping: A Fuzzy Logic based Wide-Area Load Shedding\Generation Rejection Scheme
S.
Teimourzadeh
School of Electrical and Computer Engineering, University of Tehran, Tehran, Iran
author
F.
Aminifar
School of Electrical and Computer Engineering, University of Tehran, Tehran, Iran
author
M.
Sanaye-Pasand
School of Electrical and Computer Engineering, University of Tehran, Tehran, Iran
author
text
article
2017
per
In this paper, a new inter-area oscillation damping approach is proposed based on system-wide measurement data. The load shedding and generation rejection are the main tools which are utilized for inter-area oscillations damping purpose. The proposed scheme is a defense plan deployable whenever the performance of existing controllable devices, say FACTS, are inadequate. The proposed method is founded on the basis of a four-layer framework including data acquisition, oscillation detection, decision making, and application layers. The decision making process is based on the Fuzzy logic engine. The input signals are rotor angular velocity and its associated derivative; besides, the outputs of the new defense plan are the load shedding or generation rejection commands. Comprehensive simulation studies on a two-area system confirm validity of the proposed scheme under various situations.
TABRIZ JOURNAL OF ELECTRICAL ENGINEERING
Faculty of Electrical & Computer Engineering
2008-7799
47
v.
1
no.
2017
39
48
https://tjee.tabrizu.ac.ir/article_5302_cb699c109055d55d5c1bff0ac526adbd.pdf
Blind Recognition of BCH Product Codes
M.
Teimouri
Faculty of New Sciences and Technologies, University of Tehran, Tehran, Iran
author
H. R.
Kakaei Motlagh
Faculty of Electronic Warfare and Cyber Defense, Imam Hossein Comprehensive University, Tehran, Iran
author
M.
Haddadi
Faculty of Electronic Warfare and Cyber Defense, Imam Hossein Comprehensive University, Tehran, Iran
author
text
article
2017
per
As a result of growing application of concatenated codes such as product codes in military wireless communication systems, the ability of blind recognition and reconstruction of such codes in electronic warfare (EW) systems is one of the important necessities. So far, diverse methods for recognition of forward error correction (FEC) codes have been suggested; however, in terms of blind recognition of TPCs no method has been introduced yet. In this paper, we have tried to generalize the existing methods for recognition of two-dimensional TPCs. We apply two well-known methods of blind recognition, i.e. greatest common divisor (GCD) and matrix rank (MR), for recognition of these codes. Based on these methods, code parameters, i.e. code word length, message length, and the structure of code are determined. Simulation results are presented and analyzed which prove the effectiveness of the proposed method.
TABRIZ JOURNAL OF ELECTRICAL ENGINEERING
Faculty of Electrical & Computer Engineering
2008-7799
47
v.
1
no.
2017
49
54
https://tjee.tabrizu.ac.ir/article_5310_fc24f1b8bed4af045f7dd480070e4131.pdf
Sensorless Selective Torque Harmonic Elimination Control for a Non-Sinusoidal Permanent Magnet Brushless Motor
Using a Full-Order Sliding Mode Observer
A.
Halvaei Niasar
Department of Electrical and Computer Engineering, University of Kashan, Kashan, Iran
author
A.
Faraji
Department of Electrical and Computer Engineering, University of Kashan, Kashan, Iran
author
text
article
2017
per
Nowadays, due to excellent advantages of permanent magnet brushless motors (PMBL) such as high efficiency and high torque/power density, they are used in many industrial and variable-speed electrical drives applications. If the fabricated PMBL motor has neither sinusoidal nor trapezoidal back-EMF voltages, it is named non-sinusoidal (or non-ideal) PMBL motor. Employing of conventional control strategies of PMSMs and BLDCMs decreases the efficiency and leads to unwanted torque ripple, vibration and acoustic noises. Moreover, in many applications to reduce the cost and enhance the reliability of drive, sensorless control techniques are used. This paper proposes a novel sensorless control for a non-sinusoidal PMBL motor with minimum torque ripple. To develop smooth torque, the selected torque harmonic elimination strategy is employed. Furthermore, to estimate the rotor position and speed, a novel full-order sliding mode observer is designed. The proposed observer is robust to uncertainty in back-EMF voltage contents and able to run the motor from standstill with close loop control scheme. The advantages of torque ripple minimization rather than conventional control methods and capabilities of sensorless strategy are demonstrated with some simulations.
TABRIZ JOURNAL OF ELECTRICAL ENGINEERING
Faculty of Electrical & Computer Engineering
2008-7799
47
v.
1
no.
2017
55
68
https://tjee.tabrizu.ac.ir/article_5308_7950e65f2f1c0134cb71b95768e71e45.pdf
Improved Control of Switched Reluctance Motor at High Speeds using Continuous Conduction Mode
H.
Khanbabaie Gardeshi
Faculty of Electrical Engineering, Shahid Beheshti University, Tehran, Iran
author
H.
Torkaman
Faculty of Electrical Engineering, Shahid Beheshti University, Tehran, Iran
author
text
article
2017
per
High speed switched reluctance drives have found a good place in multifarious industries such as blowers، centrifuges and turning machines، because of their simple and robust structure، and appropriate operating at very high speeds. Losing the capability of high torque production at high speeds is one of the main problems that high speed drives deal with. Different methods have already been proposed to overcome this obstacle. Some of them have paid their attention to motor design and some other to control design. In this paper a novel method has proposed to control of high speed switched reluctance motor using both continuous and discontinuous conduction modes. Having four control parameters، This new method can control the machine torque in continuous conduction mode. To verify the effectiveness of the method، simulation using software were implemented.
TABRIZ JOURNAL OF ELECTRICAL ENGINEERING
Faculty of Electrical & Computer Engineering
2008-7799
47
v.
1
no.
2017
69
79
https://tjee.tabrizu.ac.ir/article_5296_8649490e8bbf3df7a368a0878504af05.pdf
The Intelligent and Automatic Detection of Type Errors in Large Databases without using Dictionary
E.
Zafarani-Moattar
Department of Computer Engineering, Tabriz Branch, Islamic Azad University, Tabriz, Iran
author
M. R.
Feizi-Derakhshi
Department of Computer Engineering, University of Tabriz, Tabriz, Iran
author
A.
Roohany
Department of Computer Engineering, Khosroshah Branch, Islamic Azad University, Khosroshah, Iran
author
text
article
2017
per
Type errors are one of the main problems in computer systems and database systems. Existence of type errors within databases, not only causes accuracy problem for database, but also leads user to re-enter the record into database because the entered record could not be found. It results in redundancy. The existing error detection methods are based on dictionary. It means that they use a large dictionary whose all words are assumed true and if a word is not in the dictionary, it is detected as a type error. Providing a large dictionary with high precision is expensive and time consuming. In addition, such a dictionary belongs to a special field (for example, medical environment) and is not applicable in other fields (such as sociology). In this paper, a method is presented that could detect type errors without requiring a dictionary. The proposed method has been evaluated with some common criteria. The experimental results show 93.5 percent precision for this method. In addition to the high precision of the proposed method, not requiring a dictionary is considered as its unique feature.
TABRIZ JOURNAL OF ELECTRICAL ENGINEERING
Faculty of Electrical & Computer Engineering
2008-7799
47
v.
1
no.
2017
81
91
https://tjee.tabrizu.ac.ir/article_5303_7ddca57eb70ba9509ed687fcc5a75d76.pdf
How to Design a 9-11 GHz Balanced Low Noise Amplifier using HJFET Transistor
Z.
Zeinadini
Faculty of Electrical and Computer Engineering, Isfahan University of Technology (IUT), Isfahan, Iran
author
Z. H.
Firouzeh
Faculty of Electrical and Computer Engineering, Isfahan University of Technology (IUT), Isfahan, Iran
author
R.
Bahadori-Nezhad
Research Institute for Avionics, Isfahan University of Technology, Isfahan, Iran
author
text
article
2017
per
Balanced amplifiers, using two quadrature couplers in their structures, are usually used in microwave integrated circuits for high power or low noise and wide-band applications. For an instance, the balanced amplifiers are appropriate for transmitters/receivers of large phased array radars used in air and space radar systems. In this paper, several microwave power combiners/dividers such as Lange coupler, Wilkinson power divider and branch-line coupler are used to design and simulate a balanced low noise amplifier (LNA) and then the results are compared with single-ended low noise amplifier. The balanced low noise amplifier with two-stage Wilkinson power divider/combiner is preferred to other circuits regarding to noise figure, frequency bandwidth, stability and easy implementation. The measurement results of the fabricated balanced LNA show that the gain is 12 dB with the flatness of ±0.5 dB over the frequency range of 9-11 GHz. In addition, the input and output return losses are more than 15 dB and 10 dB, respectively. The noise figure, measured by Y-factor method, is 1.3 dB at 10 GHz.
TABRIZ JOURNAL OF ELECTRICAL ENGINEERING
Faculty of Electrical & Computer Engineering
2008-7799
47
v.
1
no.
2017
93
105
https://tjee.tabrizu.ac.ir/article_5295_e6856b6d25674053db920354571ec2f9.pdf
A Novel DC-DC Boost Converter Based on Switched-Inductor / Switched-Capacitor with Very High Voltage Gain
M.
Salimi
Department of Electrical Engineering, Ardabil Branch, Islamic Azad University, Ardabil, Iran
author
M.
Pornadem
Department of Electrical Engineering, Ardabil Branch, Islamic Azad University, Ardabil, Iran
author
text
article
2017
per
In this paper, a novel transformerless DC-DC boost converter with very high voltage gain is proposed. By modular extension of the proposed structure, more improvements can be obtained in converter voltage gain and switch stress. The developed converter is designed using switched inductor/capacitor circuits and all of the switches are controlled by a single pulse width modulation (PWM) unit. In the presented topology, inductors current and capacitors voltage are equal during different transient and steady-state conditions. For this reason, in the closed-loop control of the proposed chopper, multiple voltage and current sensors are not required for measurement of the state variables. Also, performance of the proposed converter is compared with similar circuits which are reported in recent years. Experimental response of the proposed converter is investigated in both Continuous (CCM) and Discontinuous Conduction Modes (DCM) of operation. The experiment results are provided to verify the theoretical analysis. Finally, using a standard linear double-loop controller, closed-loop response of the developed converter is regulated under load and input voltage changes. It is shown that a unique current feedback is enough for regulation of the converter output voltage.
TABRIZ JOURNAL OF ELECTRICAL ENGINEERING
Faculty of Electrical & Computer Engineering
2008-7799
47
v.
1
no.
2017
107
121
https://tjee.tabrizu.ac.ir/article_5312_fda5521024ae8faa943ae4b6c1a067b3.pdf
Optimal Location and Sizing of Distributed Generation Resources and Capacitors Simultaneously in Distribution Systems considering Multi-level Voltage Dependent Load Model
M. R.
Shakarami
Faculty of Engineering, University of Lorestan, Khorramabad, Iran
author
M.
Tarhani
Faculty of Engineering, University of Lorestan, Khorramabad, Iran
author
E.
Rokrok
Faculty of Engineering, University of Lorestan, Khorramabad, Iran
author
text
article
2017
per
In this paper, an optimization method is proposed to determine the optimal placement and size of Distributed Generation (DG) resources and capacitors simultaneously in radial distribution systems. Improvement of active and reactive power losses, voltage deviation, line load balancing and voltage stability indices of the network are objectives of this optimization problem. A multi-objective function with appropriate constraints has been proposed. In order to robust the location of DGs and capacitors against load variations, different load levels have been incorporated into the objective function simultaneously, while the generated power of DGs and reactive power of capacitors are assumed to be variable for each load level. In this study, light, nominal and heavy load levels have been considered for network. Also, the loads are considered to be voltage dependent. The optimization problem has been solved by TLBO algorithm. The proposed method has been implemented on the 33 and 69 bus radial distribution standard systems and the results have been compared with the methods based on single-level and loss sensitivity factor. The obtained results show superiority of the proposed method.
TABRIZ JOURNAL OF ELECTRICAL ENGINEERING
Faculty of Electrical & Computer Engineering
2008-7799
47
v.
1
no.
2017
123
139
https://tjee.tabrizu.ac.ir/article_5306_6be9e62eebba504970f20c244c2eb536.pdf
A Probabilistic Method to Determine the Optimal Setting of Combined Overcurrent Relays considering Uncertainties
A.
Saberi Noughabi
Faculty of Electrical and Computer Engineering, University of Birjand, Birjand, Iran
author
H.
Badrsimaei
Faculty of Electrical and Computer Engineering, University of Birjand, Birjand, Iran
author
M.
Farshad
Faculty of Electrical and Computer Engineering, University of Birjand, Birjand, Iran
author
text
article
2017
per
In this paper, a new method is presented to determine the optimal settings of instantaneous unit and delay unit of combined overcurrent relay using probabilistic modeling of uncertainties. The uncertainties such as measurement error, operating conditions of system and fault conditions, are modelled probabilistically and use the Monte-Carlo method to determine the interval fault current passing through the relays. Two probabilistic sensitivity and selectivity indexes are defined for instantaneous unit of relay and the problem of determine the optimal setting of instantaneous unit is formulated as an optimization problem. The objective function of this problem is maximize the probabilistic sensitivity index and the complete selectivity is as constraint. Then, an interval method is used to solve this optimization problem and determine the optimal settings of instantaneous unit of relays. Also, using probabilistic modeling of uncertainties, the problem of determine the optimal settings of delay unit is formulated as an optimization problem and a hybrid Genetic Algorithm-Monte Carlo method has been used to solve it. The numerical results in two 8-bus and 14-bus IEEE test system showed that if using the proposed method, the more area of line is protected instantaneously and the remaining line has been protected by delay unit in minimum possible time and with complete selectivity.
TABRIZ JOURNAL OF ELECTRICAL ENGINEERING
Faculty of Electrical & Computer Engineering
2008-7799
47
v.
1
no.
2017
141
153
https://tjee.tabrizu.ac.ir/article_5294_7431a509f0c7dca1d895b8acc22568db.pdf
Design and Constructing of STATCOM Based on GPI Controller
A.
Salehi
Faculty of Engineering, Islamic Azad University, Ashtian Branch, Ashtian, Iran
author
H.
Feshki Farahani
Faculty of Engineering, Islamic Azad University, Ashtian Branch, Ashtian, Iran
author
M.
Asadi
Faculty of Electrical Engineering, Arak University of Technology, Arak, Iran
author
text
article
2017
per
This paper is proposed a generalized proportional integrator (GPI) controller for static synchronous compensator (STATCOM) based on instantaneously reactive power (IRP) theory. For this purpose, at first the reference current of each phase is calculated using the related equation and then the switching signals are generated based on GPI controller. Designing of controller parameters is done based on system transfer function and gain margin in the frequency domain. Also, this paper is proposed the selecting of GPI coefficient to compensate the output current sensors delay and steady state gain variation. In the other parts of this paper, a STATCOM is designed and is simulated based on proposed controller. In these simulations, the capability of STATCOM is studied in different conditions such as inductive and capacitive load. Furthermore, the effect of load variation is investigated and the controller capability is evaluated. Finally, a 10KVA laboratory prototype was designed and fabricated and real test results was compared with simulation results.
TABRIZ JOURNAL OF ELECTRICAL ENGINEERING
Faculty of Electrical & Computer Engineering
2008-7799
47
v.
1
no.
2017
155
169
https://tjee.tabrizu.ac.ir/article_5316_d1e5f92494e06e40a2602ae6a50e39a5.pdf
Sensorless Predictive Torque Control of Permanent Magnet Assisted Synchronous Reluctance Machine
D.
Arab Khaburi
Faculty of Electrical Engineering, Iran University of Science & Technology, Tehran, Iran
author
A.
Sarajian
Electrical Engineering Department, Iran University of Science & Technology, Tehran, Iran
author
A.
Abbaszadeh
Electrical Engineering Department, Iran University of Science & Technology, Tehran, Iran
author
text
article
2017
per
The Permanent Magnet-Assisted Synchronous Reluctance Machines (PMA-SynRM) drive has become one of the most interesting replacements for the high efficiency variable speed drive. Herein, sensorless predictive torque control of PMA-SynRM with nonsinusoidial back electromotive force (EMF) is introduced. In order to control PMA-SynRM, finite control set-model predictive control (FCS-MPC) is implemented by means of the two-level inverter. Besides, the improvement of FCS-MPC, improve Direct mean torque control (DMTC), is utilized as a second method to control PMA-SynRM. Models including Extended Kalman Filter (EKF), Adaptive Filter (AF) and quadrature Phase-Locked Loop (PLL) are used to address estimating of back EMF, the elimination of the high order harmonics, and the accurate estimation of position and speed rotor, respectively. The simulations in nominal and low speed conditions result in effectively minimizing torque ripples compared to conventional FCS-MPC. The outcomes of the observer simulation are successfully guaranteed the accurateness of speed and rotor position.
TABRIZ JOURNAL OF ELECTRICAL ENGINEERING
Faculty of Electrical & Computer Engineering
2008-7799
47
v.
1
no.
2017
171
182
https://tjee.tabrizu.ac.ir/article_5309_4698adc0d4db31837fd599037b2703a5.pdf
The Effectiveness of the Combination of Filter and Wrapper Feature Selection Methods to Improve Software Fault Prediction
F.
Alighardashi
Faculty of Electrical and Computer Engineering, University of Yazd, Yazd, Iran
author
M. A.
Zare Chahooki
Faculty of Electrical and Computer Engineering, University of Yazd, Yazd, Iran
author
text
article
2017
per
Improving the software product quality before releasing by periodic tests is one of the most expensive activities in software projects. Due to limited resources to test modules in software projects, it is important to identify fault-prone modules and use the test sources for fault prediction in these modules. Software fault predictors based on machine learning algorithms, are effective tools for identifying fault-prone modules. Extensive studies are being done in this field to find the connection between features of software modules, and fault-prone have been done. Some of these features in predictive algorithms are like that not only did not improve the accuracy of the learning process, but also will be reduced the accuracy. In this study, due to the excellent performance of Forward Feature Selection (FS) method for effective selection of features, the initial subset of this method has been selected by using of combination of high ranking features in different Filter methods. The proposed method causes increment the speed of the convergence of feature selection as well as the accuracy improvement. The obtained results on NASA dataset with AUC criteria, indicates the effectiveness of this method in the improvement of the accuracy and the speed of software fault prediction.
TABRIZ JOURNAL OF ELECTRICAL ENGINEERING
Faculty of Electrical & Computer Engineering
2008-7799
47
v.
1
no.
2017
183
195
https://tjee.tabrizu.ac.ir/article_5317_2e87b5a602afdea56c8e2d2c14f474d1.pdf
Parameter Estimation of Binary BCH Code in Noisy Case using the Parity-Check Bits-based Method
A.
Gholizadeh Soteh
Faculty of Electrical and Computer Engineering, Malek Ashtar University of Technology, Tehran, Iran
author
H.
Khaleghi Bizaki
Faculty of Electrical and Computer Engineering, Malek Ashtar University of Technology, Tehran, Iran
author
text
article
2017
per
This paper studies the problem of binary BCH code parameters estimation in noisy scenario. Despite the importance of this issue in such areas as the design of cognitive radio receiver, so far just a few methods have been proposed to solve it. All these methods are based on the BCH code generator polynomials roots and factors, and hence, are effective only in the very low noise. This paper proposes a new effective algebraic method to identify the BCH code parameters. In this method, the parameter estimation is performed based on the test of a few BCH codes. For each of these codes, the parity check bits are generated again by the message bits, and then compared with the parity check bits of received code word. The Decision criterion is the number of differences between the parity check bits. To do this, the number of unequal bits should be compared with a threshold. In this paper, we analytically compute the probability distribution of unequal parity check bits number and then propose an appropriate threshold. The simulation results show that the performance of proposed method is much higher than the previous methods.
TABRIZ JOURNAL OF ELECTRICAL ENGINEERING
Faculty of Electrical & Computer Engineering
2008-7799
47
v.
1
no.
2017
197
209
https://tjee.tabrizu.ac.ir/article_5305_4fd86521eeab71cb03fc77f05de087b6.pdf
A Game-theoretic Approach to Defensive Mechanism Design for Physical Layer Security: Application to Vehicular Ad-Hoc Networks
M.
Kakavand Mirzaeei
Department of Electrical Engineering, University of Guilan, Rasht, Iran
author
J.
Seifali Harsini
Department of Electrical Engineering, University of Guilan, Rasht, Iran
author
text
article
2017
per
In the recent years the growth of wireless communications technology and its application in the development of new data services creates new challenges in the research field of data communications and networking. For example, in the field of intelligent transport systems, the concept of vehicular ad-hoc networking is presented. Because of the broadcast nature of radio environment, there are always opportunities for the network attackers to affect wireless communications systems. Hence, the issue of security for the transmission of sensitive data is of great importance. In the physical layer of the network, the attack may occur in the form of signal jamming or eavesdropping. In this paper, a defensive mechanism is designed using transmitter power control to reduce the damaging effects of these two physical layer attacks. Using a game-theoretic formulation, the mechanism optimizes OFDM subcarrier powers at both the main data transmitter and the attacker in order to improve the security of the communication channel (secrecy capacity). As an application of the proposed method, simulation results are provided for a vehicular ad-hoc network (VANET) scenario based on the IEEE802.11p standard.
TABRIZ JOURNAL OF ELECTRICAL ENGINEERING
Faculty of Electrical & Computer Engineering
2008-7799
47
v.
1
no.
2017
211
220
https://tjee.tabrizu.ac.ir/article_5293_1b8653557c7ebc3cd3af74c19bf6c6ea.pdf
A Novel Ring Voltage Controlled Oscillator utilizing Miller Effect
M. A.
Karami
School of Electrical Engineering, Iran University of Science and Technology, Tehran, Iran
author
M.
Ansarian
School of Electrical Engineering, Iran University of Science and Technology, Tehran, Iran
author
S.
Aghli-Moghaddam
School of Electrical Engineering, Iran University of Science and Technology, Tehran, Iran
author
text
article
2017
per
In this paper, a novel ring voltage controlled oscillator (VCO) is presented. Miller effect is used for changing capacitance of the base delay cell of oscillator. The simulation results show better linearity and reduction in phase noise. The VCO is designed and post layout simulated using 0.18 um Complementary Metal Oxide Semiconductor (CMOS) technology design kit. The proposed VCO is optimized for two different criteria of achieving minimum noise and achieving high frequency with maximum linearity. A phase noise of -125 dBc/Hz at center frequency of 314 MHz is achieved for the low noise device and maximum nonlinearity error of 0.9% at center frequency of 3.89 GHz is achieved for the high frequency with maximum linearity device.
TABRIZ JOURNAL OF ELECTRICAL ENGINEERING
Faculty of Electrical & Computer Engineering
2008-7799
47
v.
1
no.
2017
221
228
https://tjee.tabrizu.ac.ir/article_5289_8322c015e9c0e4496e7e956eb0a210e3.pdf
Optimal Placement of DGs and DSTATCOMs in order to Loss Reduction and Loadability Improvement
H.
Karami
Faculty of Electrical Engineering, Amirkabir University of Technology, Tehran, Iran
author
B.
Zaker
Faculty of Electrical Engineering, Amirkabir University of Technology, Tehran, Iran
author
M.
Nasiri
Faculty of Electrical Engineering, Amirkabir University of Technology, Tehran, Iran
author
H.
Tarimoradi
Faculty of Electrical Engineering, Amirkabir University of Technology, Tehran, Iran
author
G.
Gharehpetian
Faculty of Electrical Engineering, Amirkabir University of Technology, Tehran, Iran
author
text
article
2017
per
Increasing load demand in distribution system, needs extension of distribution system or restructure of network. All the changes in the distribution network, to respond load demand increasing, known as development of distribution system. Due to the development of distribution systems and increasing electricity demand, and in order to overcome the shortcomings of distribution systems such as high loss and low loadability, the use of distributed generation (DG) and FACTS devices such as DSTATCOMs are increasing. The placement of these devices is a significant factor affecting network loss reduction and improving network performance. In this paper, in order to achieve optimal places of DGs and DSTATCOMs, a new objective function is proposed and optimized based on the genetic algorithm (GA). The objective function includes system loadability and network loss. The proposed method is applied to the IEEE 33-bus and 69-bus test system and optimal places of DGs and DSTATCOMs are achieved by the proposed method. The results show the effectiveness of the proposed method to loadability improvement and loss reduction. As metaheuristic algorithms cannot exactly find optimal point in some problems, the results of this paper are near-optimal points for places of DGs and DSTATCOMs.
TABRIZ JOURNAL OF ELECTRICAL ENGINEERING
Faculty of Electrical & Computer Engineering
2008-7799
47
v.
1
no.
2017
229
238
https://tjee.tabrizu.ac.ir/article_5313_b1224c18c8296df399628be6ebaf46fb.pdf
Dynamic Sliding Mode Control Design for Nonlinear Systems Using Sliding Mode Observer
A.
Karami-Mollaee
Faculty of Electrical and Computer Engineering, Hakim Sabzevari University, Sabzevar, Iran
author
E.
Rajabi
Faculty of Electrical and Robotic Engineering, Sharood University of Technology, Shahrood, Iran
author
text
article
2017
per
In this paper, dynamic sliding mode control (DSMC) of nonlinear systems using sliding mode observer is proposed. In DSMC the chattering is removed due to the integrator (or a low pass filter) which is placed before the input control signal of the plant. However, in DSMC the augmented system (system plus the integrator) is one dimension bigger than the actual system (if the integrator is used) and then to stabilize the system, the plant model should be completely known. To solve this problem, we suggest a sliding mode observer to identify and to obtain a model for the uncertain nonlinear system and then, chattering free control signal is calculated to have desired properties. Stability of the proposed observer and controller is based on Lyapunov theorem and moreover the upper bound of the system dynamic is not used which is important in practical applications. To verify the proposed approach, Duffing-Holmes chaotic system with comparison to usual sliding mode control is used. To have a rightful comparison, we use from the same observer (the proposed sliding mode observer) in two methods. With comparison of the equations, we can see the simplicity of the usual SMC while one can also see the simple concepts of DSMC. Moreover, from equations and simulations, it is clear that in usual SMC chattering is available, while in DSMC chattering is removed completely.
TABRIZ JOURNAL OF ELECTRICAL ENGINEERING
Faculty of Electrical & Computer Engineering
2008-7799
47
v.
1
no.
2017
239
248
https://tjee.tabrizu.ac.ir/article_5304_1146c6054c190eb660b6495738f6fde5.pdf
Robust Optimization-based Energy Management of Virtual Power Plant by Monitoring Microgrid Contingencies: Single-Line Outage Case Study
S.
Kaabe Pahne Kolaei
Faculty of Electrical Engineering, Shahrood University of Technology, Shahrood, Iran
author
M.
Rahimiyan
Faculty of Electrical Engineering, Shahrood University of Technology, Shahrood, Iran
author
text
article
2017
per
In this paper, a robust optimization model is proposed for energy management of a Virtual Power Plant (VPP) including solar power stations, energy storage facilities and demands interconnected within a microgrid. In the robust optimization model, the uncertain parameters of solar power production and energy prices are modelled as confidence intervals. On the other hand, equipped with smart grid technology, the two-way communication between the energy management system and microgrid components, as well as between the energy management system and main grid is possible. The energy management system can make decisions while monitoring conditions of microgrid components and updating available information. Thus, the energy management system is informed about microgrid contingencies in real-time, and modifies its decisions related to power traded with the main grid, solar power production and power load shedding or shifting. The confidence intervals of energy price and solar energy production are forecasted based on real-world historical data collected from the New England electricity market, US. Impact of forecast accuracy, contingency occurrence and confidence level on the performance of the robust optimization model is investigated. Simulation results indicate good performance of the robust optimization model compared with a conventional deterministic method.
TABRIZ JOURNAL OF ELECTRICAL ENGINEERING
Faculty of Electrical & Computer Engineering
2008-7799
47
v.
1
no.
2017
249
261
https://tjee.tabrizu.ac.ir/article_5314_8a6ace5e506bc38539ad3868930201da.pdf
Classification of Sonar Targets using Particle Swarm Optimization via Independent Groups
M. R.
Mosavi
Department of Electrical Engineering, Iran University of Science and Technology, Tehran, Iran
author
M.
Khishe
Department of Electrical Engineering, Iran University of Science and Technology, Tehran, Iran
author
E.
Ebrahimi
Department of Electrical Engineering, Shiraz University of Technology, Shiraz, Iran
author
F.
Mohamadzadeh
Department of Electrical Engineering, Imam Khomeini University, Noshahr, Iran
author
text
article
2017
per
Due to the fact that sonar targets have high dimensions and local optimums, conventional classifiers do not have adequate ability to classify these targets. Using a combination of Particle Swarm Optimization (PSO) and Artificial Neural Networks (ANNs) is one of the solutions to overcome this problem. PSO has two drawbacks in high-dimensional datasets: being trapped in local minimums and slow convergence rate. To tackle these deficiencies, this paper uses a newly proposed meta-heuristic algorithm entitled Independent Group Particle Swarm Optimization (IGPSO). This algorithm is inspired by the diversity of individuals in the accumulation of birds or the swarm of insects. It has the unique ability to classify high-dimensional dataset (sonar). In order to test the capabilities of the IGPSO, the algorithm will be evaluated by 23 well-known test functions and the results are compared to PSO and improved versions of PSO. The results show that IGPSO is able to provide much better results in finding the global minimum of functions, convergence speed and local minima avoidance compared with other benchmark algorithms. The results show that the classifier which is designed with IGPSO classifies sonar dataset with accuracy about 96.67% while the accuracy of the PSO-classifier is about 92.33%.
TABRIZ JOURNAL OF ELECTRICAL ENGINEERING
Faculty of Electrical & Computer Engineering
2008-7799
47
v.
1
no.
2017
263
274
https://tjee.tabrizu.ac.ir/article_5301_a2b1c442edd7336a0bcbebb673ee6f70.pdf
Distributed Generation Expansion Planning in Sub-Transmission Substations Considering Transmission Substations Expansions using a Novel Bi-level Model
F.
Misaghi
Faculty of Electrical and Computer Engineering, Babol University of Technology, Babol, Iran
author
T.
Barforoshi
Research Department of HV Stations, Faculty of Electrical and Computer Engineering, Babol University of Technology, Babol, Iran
author
M.
Jafari
Faculty of Electrical and Computer Engineering, Babol University of Technology, Babol, Iran
author
text
article
2017
per
In this paper, a novel framework is proposed to solve distributed generation (DG) expansion planning problem in sub-transmission substations considering expansions of transmission substation capacities in the presence of incentives. The prposed model includes both the firm contract and capacity payment as incentive options. A bi-level model is presented for the problem, where the upper level consists of optimal decision of investor through maximizing profit, while market clearing and substation expansion are considered in lower level. Due to existing of binary variable in the lower level problem and therefore its non-convexity, it is not possible to convert the bi-level problem in to a single level, so-called mathematical problem with equilibrium constraints (MPEC). Thus, an algorithm which gains the combination of enumeration and mathematical optimization is used to tackle with the non-convexity. In the proposed approach, according a few number of expansion strategies of substation upgrading, all strategies are considered and a MILP is solved for each strategy. The efficieancy of the proposed model is examined on a six-bus network and on a part of subtransmission network of MAZANDARAN regional electric company (MREC).
TABRIZ JOURNAL OF ELECTRICAL ENGINEERING
Faculty of Electrical & Computer Engineering
2008-7799
47
v.
1
no.
2017
275
286
https://tjee.tabrizu.ac.ir/article_5297_68c542ed40e4ce5b12758f2f8cfa433d.pdf
A High-Speed Protection Scheme for Transmission Lines using Mathematical Morphology
F.
Namdari
Department of Power Electric Engineering, Faculty of Technical and Engineering, Lorestan University, Khorramabad, Iran
author
M.
Salehi
Department of Power Electric Engineering, Faculty of Technical and Engineering, Lorestan University, Khorramabad, Iran
author
text
article
2017
per
In this paper, a novel high-speed protection scheme, for transmission lines based on initial current traveling waves and employing mathematical morphology (MM) is presented. This scheme, by comparing polarity and arrival time of initial current traveling wave from two terminals of the protected line, can discriminate the fault direction and internal faults from external faults rapidly. A new MM filter to extract transient components from fault-induced transient signals is designed. This MM filter can fast and accurately detect the arrival time and polarity of traveling waves in all conditions. Extensive simulation studies using EMTP and MATLAB are performed to evaluate the validity and reliability of the proposed scheme. The simulation results show that the proposed protection scheme can fast and reliably discriminate the fault direction and the internal faults from external faults in the most of conditions, especially in high impedance fault and low inception angle fault situation. The protection performance is immune to fault resistances, fault inception angles, fault types and fault location.
TABRIZ JOURNAL OF ELECTRICAL ENGINEERING
Faculty of Electrical & Computer Engineering
2008-7799
47
v.
1
no.
2017
287
298
https://tjee.tabrizu.ac.ir/article_5315_43898a1a94b19b0fd48494fa53a0c63b.pdf
Presenting Double Gate MOSFET Structure by using Double Material of HfO2 and SiGe in the Channel of Silicon (DM-DG)
H.
Najafalizadeh
Faculty of Electrical and Computer Engineering, Semnan University, Semnan, Iran
author
A. A.
Orouji
Faculty of Electrical and Computer Engineering, Semnan University, Semnan, Iran
author
text
article
2017
per
In this paper, a new structure of the double gate transistor named DM-DG transistor is presented. In this structure by using HfO2 insulation in the border region of drain and channel, and using of silicon- germanium in the source region the structure is improved, comparing to conventional structures double gate (C-DG). HfO2 insulation area reduces the electric field in the channel and drain region significantly. Because of reducing hot carrier effects and reducing the effect of drain induced barrier lowering (DIBL), the destructive processes in this structure are lower than the conventional double gate structure. In order to avoiding gathering additional holes to the surface of the channel, and reduces the parasitic BJT transistor and floating body effect (FBE) in our structure, we use Silicon- germanium in the source region. In this article 2D simulation results have been shown using ATLAS software and because of the short length of the channel region (20 nm) quantum model has been used.
TABRIZ JOURNAL OF ELECTRICAL ENGINEERING
Faculty of Electrical & Computer Engineering
2008-7799
47
v.
1
no.
2017
299
304
https://tjee.tabrizu.ac.ir/article_5311_a7d5ed503372da329ef85919982c6fbf.pdf
Assessment of Preventive Facilities against Voltage Instability Considering Power System Losses, Correlated Wind Turbine Uncertainty and Load Variations
M.
Nojavan Goltappeh
Faculty of Electrical and Computer Engineering, University of Tabriz, Tabriz, Iran
author
H.
Seyedi
Faculty of Electrical and Computer Engineering, University of Tabriz, Tabriz, Iran
author
B.
Mohammadi Ivatloo
Faculty of Electrical and Computer Engineering, University of Tabriz, Tabriz, Iran
author
text
article
2017
per
This paper presents a comprehensive method for preventing voltage instability, considering load variation, power system losses and correlated wind turbines. The proposed method considers large interval for load variation and comprehensive assessment of preventive facilities versus load variation is performed. The proposed method is simulated on large scale IEEE 118-bus test system. The effect of uncertain correlated wind turbines, power system losses and demand response considering voltage stability margin, on preventive facilities is analyzed, too.
TABRIZ JOURNAL OF ELECTRICAL ENGINEERING
Faculty of Electrical & Computer Engineering
2008-7799
47
v.
1
no.
2017
305
318
https://tjee.tabrizu.ac.ir/article_5300_26a9323ecd267f43b58609c7aaa3005b.pdf
Mixed H2/H∞ Robust Controller Design and Simultaneous use of Virtual Inertia for Stability Improvement of Micro-grids
M.
Niyazi
Department of Electrical Engineering, Collage of Engineering, Kermanshah Branch, Islamic Azad University, Kermanshah, Iran
author
S.
Karimi
Department of Electrical Engineering, Razi University, Kermanshah, Iran
author
S.
Baniardalani
Department of Electrical Engineering, Kermanshah University of Technology, Kermanshah, Iran
author
text
article
2017
per
In this paper, to improve the stability of a micro-grid in islanding mode, that contains two wind and gas DG units, simultaneous use of virtual inertia and robust controller is proposed. The use of the variable speed wind turbine and the Doubly-Fed Induction Generator (DFIG) reduces the system inertia and thereby decreases the dynamic stability. Implementation of virtual inertia in DFIG improves the power system stability. However, the change or uncertainty of the system parameters is a major challenge that must be considered when using the virtual inertia. In this paper, the implementation of virtual inertia in DFIG control system is described in detail and the impact of uncertainty and change of the control system parameters over performance of the frequency control system is investigated. In order to improve the dynamic and the steady state performance of the frequency control system, benefiting from the impact of virtual inertia, the mixed H2/H∞ robust controller is proposed. The simulation results using MATLAB show that the proposed hybrid controller guarantees the system stability in conditions of uncertainty and change of the control system parameters.
TABRIZ JOURNAL OF ELECTRICAL ENGINEERING
Faculty of Electrical & Computer Engineering
2008-7799
47
v.
1
no.
2017
319
328
https://tjee.tabrizu.ac.ir/article_5299_ace9f31b7b832e6b85c7496c723158aa.pdf
Hierarchical and Distributed Voltage Management in Smart Grid with Distribution Generator Participation
M.
Nayeripour
Department of Electrical and Electronic Engineering, Shiraz University of Technology, Shiraz, Iran
author
H.
Fallahzadeh-Abarghouei
Department of Electrical and Electronic Engineering, Shiraz University of Technology, Shiraz, Iran
author
S.
Hasanvand
Young Researchers and Elite Club, Islamic Azad University of Khorramabad Branch, Khorramabad, Iran
author
text
article
2017
per
The primary purpose of a distribution system is to meet the damands optimally as well as to maintain voltage within a specified range. Since renewable energy resources such as wind and solar energy have intermittent nature, they cause significant fluctuations in distribution system voltages. In conventional methods, tap changer transformers, voltage regulators and capacitor banks are used to control the voltage of distribution network, but these equipments are not proper to track rapid changes. The proposed method in this paper which is based on distributed generations with smart inverters, presents a distributed and hierarchical management approach to maintain the bus voltages within an allowable range. At first, the distribution system is devided to multiple areas and then voltage profile is managed in an optimal way by determining reactive power set point of generators for each area in two levels: real-time primary level and coordinated secondary level. The results on 34-bus test feeder under different load level show that the proposed voltage management scheme has high accuracy and reasonable computation time which makes it efficient approach for smart distribution grid with renewable resources.
TABRIZ JOURNAL OF ELECTRICAL ENGINEERING
Faculty of Electrical & Computer Engineering
2008-7799
47
v.
1
no.
2017
329
343
https://tjee.tabrizu.ac.ir/article_5298_18a411816000e8c7241e426e50a39359.pdf
Adaptive Ensemble Classification for Speaker Verification
M.
Hasheminejad
Faculty of Electrical and Computer Engineering, University of Birjand, Khorasan Jonoobi, Iran
author
H.
Farsi
Faculty of Electrical and Computer Engineering, University of Birjand, Khorasan Jonoobi, Iran
author
N.
Mehrshad
Faculty of Electrical and Computer Engineering, University of Birjand, Khorasan Jonoobi, Iran
author
text
article
2017
per
This paper considers the ensemble classification for the text independent speaker verification issue. Using one classifier for the speaker verification may not result in dependable decision, because it may not exploit different characteristics of speech signal. Therefore, state-of-the-art speaker verification systems use an ensemble of classifiers for the verification. Most of the ensemble speaker verification systems use a weighted summation of the score of the individual expert classifiers to calculate the final score of the verification. The weights of this score fusion is obtained using a method, e.g. logistic regression, in the training phase. These works do not efficiently take into account issues such as correlation of classifiers and instance specific behavior of the base classifiers into account. In this paper a new solution is proposed for these two issues by using the process of ensemble design and combination rule based on training data. The obtained results on NIST 2004 speaker evaluation corpus show the effectiveness of the proposed methods in comparison to the sparse classifier fusion, as a baseline method.
TABRIZ JOURNAL OF ELECTRICAL ENGINEERING
Faculty of Electrical & Computer Engineering
2008-7799
47
v.
1
no.
2017
345
354
https://tjee.tabrizu.ac.ir/article_5292_12fc8b5dfc6360bdcaa36bb36a0ec91b.pdf