OTHERS_CITABLE
Spoofing Mitigation of GPS Receiver using Least Mean Squares-Based Adaptive Filter
The Global Positioning System (GPS) signals are very weak signal over wireless channels, so they are vulnerable to in-band interferences. Therefore, even a low-power interference can easily spoof GPS receivers. Among the variety of GPS signal interference, spoofing is considered as the most dangerous intentional interference. The spoofing effects can mitigate with an appropriate strategy in the receiver. In this paper, we use methods of adaptive filter based on Least Mean Squares (LMS) and Normalized Least Mean Squares (NLMS) algorithms in-order to defense against spoofing. The proposed techniques are applied in the acquisition stage of the receiver. The proposed methods have been implemented on real dataset. The results explain that the suggested algorithms significantly decrease spoofing. Also, they improve Position Dilution of Precision (PDOP) parameter. Based on the results, NLMS algorithm has better performance than LMS algorithm.
http://ijeee.iust.ac.ir/article-1-764-en.pdf
2015-10-20
184
194
10.22068/IJEEE.11.3.184
Adaptive Filter
GPS
LMS
Mitigation
NLMS
PDOP
Spoofing
M. R.
Mosavi
m_mosavi@iust.ac.ir
1
Iran University of Science and Technology
AUTHOR
Z.
Shokhmzan
z_shokhmzan@elec.iust.ac.ir
2
Iran University of Science and Technology
AUTHOR
OTHERS_CITABLE
Circular Mean Filtering For Textures Noise Reduction
In this paper, a special preprocessing operations (filter) is proposed to decrease
the effects of noise of textures. This filter using average of circular neighbor points (Cmean)
to reduce noise effect. Comparing this filter with other average filters such as square
mean filter and square median filter indicates that it provides more noise reduction and
increases the classification accuracy. After applying filter to noisy textures some Local
Binary Pattern (LBP) variants are used for feature extraction. The Implementation part for
noisy textures of Outex, UIUC and CUReT datasets shows that using proposed filter
increases the classification accuracy significantly. Furthermore, a simple and new technique
is proposed that increases the speed of c-mean filter noticeably.
http://ijeee.iust.ac.ir/article-1-782-en.pdf
2015-10-20
195
203
10.22068/IJEEE.11.3.195
Circular Mean Filter
Local Binary Pattern
Noise Robust
Texture Classification
M. H
Shakoor
mhshakoor@gmail.com
1
Shiraz Univercity
AUTHOR
F.
Tajeripour
tajeri@shirazu.ac.ir
2
Shiraz Univercity
AUTHOR
OTHERS_CITABLE
H∞ Sampled-Data Controller Design for Stochastic Genetic Regulatory Networks
Artificially regulating gene expression is an important step in developing new
treatment for system-level disease such as cancer. In this paper, we propose a method to
regulate gene expression based on sampled-data measurements of gene products
concentrations. Inherent noisy behaviour of Gene regulatory networks are modeled with
stochastic nonlinear differential equation. To synthesize feedback controller, we formulate
sampling process as an impulsive system. By using a new Lyapunov function with
discontinuities at sampling times, state feedback gain that guarantees exponential meansquare
stability and H&infin performance is derived from LMIs. These LMIs also determine the
maximum allowable time between sampling points. A numerical example and a practical
application are presented to justify the applicability of the theoretical results
http://ijeee.iust.ac.ir/article-1-760-en.pdf
2015-10-20
204
216
10.22068/IJEEE.11.3.204
Gene Regulatory Networks
Impulsive Systems
Linear Matrix Inequality
Sampled-Data Control
M.
Mohammadian
m.mohammadiankebria@gmail.com
1
Tarbiat Modares University
AUTHOR
H. R.
Momeni
momeni_h@modares.ac.ir
2
Tarbiat Modares University
AUTHOR
M.
Tahmasebi
tahmasebi@modares.ac.ir
3
Tarbiat Modares University
AUTHOR
OTHERS_CITABLE
Rotor Design of IPMSM Traction Motor Based on Multi- Objective Optimization using BFGS Method and Train Motion Equations
In this paper a multiobjective optimal design method of interior permanent magnet synchronous motor ( IPMSM) for traction applications so as to maximize average torque and to minimize torque ripple has been presented. Based on train motion equations and physical properties of train, desired specifications such as steady state speed, rated output power, acceleration time and rated speed of traction motor are related to each other. By considering the same output power, steady state speed, rated voltage, rated current and different acceleration time for a specified train, multiobjective optimal design has been performed by Broyden–Fletcher–Goldfarb–Shanno (BFGS) method and finite element method (FEM) has been chosen as an analysis tool. BFGS method is one of Quasi Newton methods and is counted in classic approaches. Classic optimization methods are appropriate when FEM is applied as an analysis tool and objective function isn’t expressed in closed form in terms of optimization variables.
http://ijeee.iust.ac.ir/article-1-770-en.pdf
2015-10-20
217
221
10.22068/IJEEE.11.3.217
Broyden-Fletcher-Goldfarb-Shanno (BFGS) Method
Interior Permanent Magnet Synchronous Motor (IPMSM)
Multi-Objective Optimal Design
Quasi Newton Methods
S.
Ahmadi
ahmadi2062@yahoo.com
1
Iran University of Science and Technology
AUTHOR
A.
Vahedi
avahedi@iust.ac.ir
2
Iran University of Science and Technology
AUTHOR
OTHERS_CITABLE
Effect of Wind Speed and Load Correlation on ELCC of Wind Turbine Generator
Utilization of wind turbines as economic and green production units, poses new challenges to the power system planners, mainly due to the stochastic nature of the wind, adding a new source of uncertainty to the power system. Different types of distribution and correlation between this random variable and the system load makes conventional method inappropriate for modeling such a correlation. In this paper, the correlation between the wind speed and system load is modeled using Copula, a mathematical tool recently used in the field of the applied science. As the effect of the correlation coefficient is the main concern, the copula modeling technique allows simulating various scenarios with different correlations. The conducted simulations in this paper reveals that the wind speed correlation with the load has significant effect on the system reliability indices, such as expected energy not served (EENS) and loss of load probability (LOLP). Moreover, in this paper the effect of the correlation coefficient on the effective load carrying capability (ELCC) of the wind turbines is analyzed, too. To perform the aforementioned simulations and analyses, the modified RBTS with an additional wind farm is used.
http://ijeee.iust.ac.ir/article-1-740-en.pdf
2015-10-20
222
230
10.22068/IJEEE.11.3.222
Power System Planning
Wind Power
Effective Load Carrying Capability
Copula
H.
Rajabi Mashhadi
h_mashhadi@um.ac.ir
1
Ferdowsi University of Mashhad
AUTHOR
M. A.
Armin
2
Ferdowsi University of Mashhad
AUTHOR
OTHERS_CITABLE
Optimal Coordination of Distance and Directional Overcurrent Relays Considering Different Network Topologies
Most studies in relay coordination have focused solely on coordination of overcurrent relays while distance relays are used as the main protection of transmission lines. Since, simultaneous coordination of these two types of relays can provide a better protection, in this paper, a new approach is proposed for simultaneous coordination of distance and directional overcurrent relays (D&DOCRs). Also, pursued by most of the previously published studies, the settings of D&DOCRs are usually determined based on a main network topology which may result in mis-coordination of relays when changes occur in the network topology. In the proposed method, in order to have a robust coordination, network topology changes are taken into account in the coordination problem. In the new formulation, coordination constraints for different network topologies are added to those of the main topology. A complex nonlinear optimization problem is derived to find the desirable relay settings. Then, the problem is solved using hybridized genetic algorithm (GA) with linear programming (LP) method (HGA). The proposed method is evaluated using the IEEE 14-bus test system. According to the results, a feasible and robust solution is obtained for D&DOCRs coordination while all constraints, which are due to different network topologies, are satisfied.
http://ijeee.iust.ac.ir/article-1-773-en.pdf
2015-10-20
231
240
10.22068/IJEEE.11.3.231
Different Network Topologies
Directional Overcurrent Relay
Distance Relay
Relay Coordination
Robust Coordination
Y.
Damchi
damchi.yaser@stu-mail.um.ac.ir
1
AUTHOR
J.
Sadeh
sadeh@um.ac.ir
2
AUTHOR
H.
Rajabi Mashhadi
h_mashhadi@um.ac.ir
3
AUTHOR
OTHERS_CITABLE
A New Method for Merchandizing Surplus Allocation
Locational Marginal Pricing (LMP) is a method for energy pricing in deregulated power systems. Loss and congestion cause different prices for energy at load or generation buses. In this pricing method there is a different between payments of customers and revenue of generators which is called Merchandizing Surplus (MS). Independent System Operator (ISO) receives MS and generally renders it to Transmission Company (Transco). It is rational that the MS be allocated among power market participants fairly instead of granting whole MS to Transco. In this paper a novel method is proposed to allocate MS among market participant according to their role in the congestion of system. In the presented method by decomposing LMP and identifying congestion part of LMP, the part of generators’ revenue and customers’ payments which caused by congestion are calculated. Then MS is allocated among market participants as the payment of customers to be equal to revenue of generators. The proposed method has been tested on five bus test system. Results indicate the effectiveness of the proposed method to allocate MS between power market participants.
http://ijeee.iust.ac.ir/article-1-759-en.pdf
2015-06-27
241
252
10.22068/IJEEE.11.3.241
Merchandizing Surplus
Locational Marginal Price
Transco Revenue
I.
Ehsani
Abtin.456@gmail.com
1
Semnan University
AUTHOR
A.
Akbari Foroud
aakbari@semnan.ac.ir
2
Semnan University
AUTHOR
A. R.
Soofiabadi
Soofiali8@gmail.com
3
Semnan University
AUTHOR
OTHERS_CITABLE
Study on Application of Two Different Magnetic Materials in Rotor of Cylindrical Synchronous Generator to Produce Reluctance Torque
Synchronous generators are of two type’s salient pole type and round rotor type. The load angle curve of a cylindrical rotor synchronous machine comprises a single sine term only while in salient pole synchronous generators, power-angle characteristic has two terms. The first term is the fundamental component due to field excitation (the same as the cylindrical rotor) and the second term includes the effect of salient pole. In fact, this term is the second harmonic component due to reluctance torque. This paper presents a study on the new design of cylindrical solid rotor synchronous generator. In this new design, rotor of the machine is designed in such a way that the required inductance values are reached to produce reluctance torque, besides electromagnetic torque due to field excitation. In this contribution, a combination of two different ferromagnetic materials is considered in the design of the rotor. In this theory, the tight connection between the different materials is very important from a mechanical point of view. In other words, this new idea and production principal has potential in some areas after some further research and engineering. But this paper is focused on magnetic flux-carrying materials and presents a study of the new design of cylindrical solid rotor synchronous generator (NCG). Then a comparative analysis was made between this new (NCG) and conventional cylindrical solid rotor synchronous generator (CCG) and the effectiveness of the new cylindrical solid rotor from a magnetic point of view is demonstrated. In this paper, mechanical and thermal aspects of design such as vibration did not analyze.
http://ijeee.iust.ac.ir/article-1-746-en.pdf
2015-10-20
253
264
10.22068/IJEEE.11.3.253
Synchronous Generator
Two Different Magnetic Materials
Cylindrical Rotor
Salient Pole Rotor
Reluctance Torque
Electromagnetic Torque
H.
yaghobi
yaghobi@semnan.ac.ir
1
Faculty of Electrical Engineering, Semnan University, Semnan, Iran
AUTHOR
H.
Kafash Haghparast
hamid25sss@yahoo.com
2
Faculty of Electrical Engineering, Semnan University, Semnan, Iran
AUTHOR
OTHERS_CITABLE
Modeling, Simulation and Control of Matrix Convert for Variable Speed Wind Turbine System
This paper presents modeling, simulation and control of matrix converter (MC) for variable speed wind turbine (VSWT) system including permanent magnet synchronous generator (PMSG). At a given wind velocity, the power available from a wind turbine is a function of its shaft speed. In order to track maximum power, the MC adjusts the PMSG shaft speed.The proposed control system allowing independent control maximum power point tracking (MPPT) of generator side and regulate reactive power of grid side for the operation of the VSWT system. The MPPT is implemented by a new control system. This control system is based on control of zero d-axis current (ZDC). The ZDC control can be realized by transfer the three-phase stator current in the stationary reference frame into d-and q-axis components in the synchronous reference frame. Also this paper is presented, a novel control strategy to regulate the reactive power supplied by a variable speed wind energy conversion system. This control strategy is based on voltage oriented control (VOC). The simulation results based on Simulink/Matlab software show that the controllers can extract maximum power and regulate reactive power under varying wind velocities.
http://ijeee.iust.ac.ir/article-1-712-en.pdf
2015-10-20
265
275
10.22068/IJEEE.11.3.265
Matrix Converter (MC)
Permanent Magnet Synchronous Generator (PMSG)
Maximum Power Point Tracking (MPPT)
Space Vector Modulation (SVM)
Variable Speed Wind Turbine (VSWT)
M.
Alizadeh Moghadam
alizadeh@znu.ac.ir
1
University of Zanjan
AUTHOR
R.
Noroozian
noroozian@znu.ac.ir
2
University of Zanjan
AUTHOR
S.
Jalilzadeh
jalilzadeh@znu.ac.ir
3
University of Zanjan
AUTHOR
OTHERS_CITABLE
Applicability improvement and hysteresis current control method simplification in shunt active filters
Hysteresis current control method is vastly used in PWM inverters because of simplicity in performance, fast control response and good ability in limiting peak current. However, switching frequency in hysteresis current control method with fixed bandwidth has large variation during a cycle and therefore causes non-optimal current ripple generation in output current. One of basic problems in implementing hysteresis current control is its variable switching frequency that causes sound noise and increase in inverter losses and also high frequency current components injection to the source current. In this paper, in addition to the calculation of variable hysteresis bandwidth equation that fixes frequency switching, also other problems can be solved by removing the derivative part. Here, a shunt active filter has been used for removing the current harmonic components generated by non-linear loads. Proposed method is simple to perform and reliable, and also has been simulated in MATHLAB software environment
http://ijeee.iust.ac.ir/article-1-769-en.pdf
2015-10-20
276
283
10.22068/IJEEE.11.3.276
Shunt Active Filter
Harmonic Spectrum
Hysteresis Bandwidth
Simplified Hysteresis Bandwidth
Optimized Hysteresis Bandwidth
H.
heidarzad moghaddam
hale_heydarzad@yahoo.com
1
AUTHOR
M.
salimi
m.salimi@iauardabil.ac.ir
2
Assistant Professor
AUTHOR