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Search Results: 1 - 10 of 401479 matches for " M. Bigdeli Tabar "
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Genetic Algorithms for Tuning Supplementary STATCOM Stabilizer in a Multi Machine Electric Power System
S. Shams Shamsabad Farahani,M. Nikzad,M. Bigdeli Tabar,M. Ghasemi Naraghi
Research Journal of Applied Sciences, Engineering and Technology , 2011,
Abstract: In this study, the performance of supplementary stabilizer for static synchronous compensator (STATCOM) tuned based on genetic algorithms in order to improvement of dynamic stability is studied. Since STATCOM is usually used for damping Low Frequency Oscillations (LFO), a supplementary stabilizer is incorporated with STATCOM to reach the mentioned purpose. Genetic Algorithms (GA) as a heuristic optimization technique is used for tuning the parameters of the STATCOM supplementary stabilizer. The IEEE 14 bus test system is considered for achieving simulation results .In order to show the ability of GA-based STATCOM to damp LFO, the system responses in case with and without STATCOM are compared. Also two different operation conditions i.e. normal and heavy have been considered for better examination of GA-based STATCOM performance. Several nonlinear time-domain simulation tests visibly show the ability of STATCOM in damping of power system oscillations and consequently stability enhancement.
Effect of Supplementary STATCOM Stabilizer Tuned Based on Simulated Annealing on Dynamic Stability Improvement in Electric Power System
M. Nikzad,S. Shams Shamsabad Farahani,M. Bigdeli Tabar,M. Ghasemi Naraghi
Research Journal of Applied Sciences, Engineering and Technology , 2011,
Abstract: In this study, the performance of supplementary stabilizer for static synchronous compensator (STATCOM) tuned based on simulated annealing in order to improvement of dynamic stability is studied. Since STATCOM is usually used for damping Low Frequency Oscillations (LFO), a supplementary stabilizer is incorporated with STATCOM to reach the mentioned purpose. Simulated annealing (SA) as a heuristic optimization technique is used for tuning the parameters of the STATCOM supplementary stabilizer. The IEEE 14 bus test system is considered for achieving simulation results .In order to show the ability of SA-based STATCOM to damp LFO, the system responses in case with and without STATCOM are compared. Also two different operation conditions i.e. normal and heavy have been considered for better examination of SA-based STATCOM performance. Several nonlinear time-domain simulation tests visibly show the ability of STATCOM in damping of power system oscillations and consequently stability enhancement.
Using Particle Swarm Optimization Method for Supplementary STATCOM Stabilizer Tuning in Electric Power System
M. Nikzad,S. Shams Shamsabad Farahani,M. Bigdeli Tabar,M. Ghasemi Naraghi
Research Journal of Applied Sciences, Engineering and Technology , 2011,
Abstract: In this study, the performance of supplementary stabilizer for static synchronous compensator (STATCOM) tuned based on particle swarm optimization method in order to improvement of dynamic stability is studied. Since STATCOM is usually used for damping Low Frequency Oscillations (LFO), a supplementary stabilizer is incorporated with STATCOM to reach the mentioned purpose. As a heuristic optimization technique, particle swarm optimization (PSO) is used for tuning the parameters of the STATCOM supplementary stabilizer. The IEEE 14 bus test system is considered for achieving simulation results .In order to show the ability of GA-based STATCOM to damp LFO, the system responses in case with and without STATCOM are compared. Also two different operation conditions i.e. normal and heavy have been considered for better examination of PSO-based STATCOM performance. Several nonlinear time-domain simulation tests visibly show the ability of STATCOM in damping of power system oscillations and consequently stability enhancement.
Phenylketonuria: Early Detection, Diagnosis and Treatment
M. GH.Bigdeli
Iranian Journal of Pediatrics , 1992,
Abstract:
Excited states energy corrections of hydrogen atom at the order of & alpha4 using NRQED as an effective field theory
S. M. Zebarjad,M. Bigdeli
Iranian Journal of Physics Research , 2003,
Abstract: In this paper, we calculate Hydrogen hyperfine splitting (HFS) at the order a4 by using NRQED as an effective field theory. We also show the leading-order contribution of nuclear size to the energy correction of Hydrogen atom .
The Instanton Solution of Forced Burgers Equation in Polyakov's Approach
M. R. Rahimi Tabar
Physics , 1997,
Abstract: We calculate the coefficients of the operator product expansion (OPE), in Polyakov's approach for Burgers turbulence. We show that the OPE has to be generalized and it is shown that the extra term gives us the instanton solution (shock solution) of Burgers equation. We consider the effect of the new-term in the OPE, on the right and left-tail of probability distribution function (PDF). It is shown that the left-tail of PDF, where is dominated by the well-separated shocks behaves as $ W(u)\sim u^{-7/2}$. Finally we calculate the assymptotic behaviour of the N-point generating function of the velocity field, using the new OPE.
Quenched Averaged Correlation Functions of the Random Magnets
M. Reza Rahimi Tabar
Physics , 2000, DOI: 10.1016/S0550-3213(00)00474-0
Abstract: It is shown that the ratios of the quenched averaged three and four-point correlation functions of the local energy density operator to the connected ones in the random-bond Ising model approach asymptotically to some $universal$ functions. We derive the explicit expressions of these universal functions. Moreover it is shown that the individual logarithmic operators have not any contribution to the connected correlation functions of the disordered Ising model.
Disordered Systems and Logarithmic Conformal Field Theory
M. Reza Rahimi Tabar
Physics , 2001, DOI: 10.1142/S0217751X03016902
Abstract: We review a recent development in theoretical understanding of the quenched averaged correlation functions of disordered systems and the logarithmic conformal field theory (LCFT) in d-dimensions. The logarithmic conformal field theory is the generalization of the conformal field theory when the dilatation operator is not diagonal and has the Jordan form. It is discussed that at the random fixed point the disordered systems such as random-bond Ising model, Polymer chain, etc. are described by LCFT and their correlation functions have logarithmic singularities. As an example we will discuss in detail the application of LCFT to the problem of random-bond Ising model in $ 2 \leq d \leq 4$.
Lowest Order Constrained Variational Calculation of the Polarized Nuclear Matter with the Modern $AV_{18}$ Potential
G. H. Bordbar,M. Bigdeli
Physics , 2008, DOI: 10.1103/PhysRevC.76.035803
Abstract: The lowest order constrained variational method is applied to calculate the polarized symmetrical nuclear matter properties with the modern $AV_{18}$ potential performing microscopic calculations. Results based on the consideration of magnetic properties show no sign of phase transition to a ferromagnetic phase.
Spin Polarized Asymmetric Nuclear Matter and Neutron Star Matter Within the Lowest Order Constrained Variational Method
G. H. Bordbar,M. Bigdeli
Physics , 2008, DOI: 10.1103/PhysRevC.77.015805
Abstract: In this paper, we calculate properties of the spin polarized asymmetrical nuclear matter and neutron star matter, using the lowest order constrained variational (LOCV) method with the $AV_{18}$, $Reid93$, $UV_{14}$ and $AV_{14}$ potentials. According to our results, the spontaneous phase transition to a ferromagnetic state in the asymmetrical nuclear matter as well as neutron star matter do not occur.
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