Seyed H. Hesamedin Sadeghi

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—This paper presents a modeling technique for output signal prediction of a waveguide probe when scanning a tilted long crack. The modeling technique establishes a cavity by placing a hypothetical conductive plane within the waveguide at some distance away from the probe–crack mouth. The position of the plane is iteratively changed until the appropriate(More)
This paper proposes an efficient modeling technique for time-domain electromagnetic analysis of a multilayered structure, using the surface equivalent principle and mixed-potential integral equations (MPIEs). First, the surface equivalent principle is used to replace the nonmetallic parts in each layer interface of the structure by prefect electrically(More)
A fractional order PID (FOPID) for a load frequency control (LFC) is presented in a three-area power system. FOPID controllers are designed the same way as PID controllers are, with the difference that FOPID controllers have five parameters in the controller that should be determined. That is why they have two more degrees of freedom for better tuning the(More)
A hybrid method is presented for modeling realistic ground penetrating radar systems to detect multiple underground conducting or dielectric targets. The model combines the method of momentpsilas solution of the frequency domain thin-wire electric field integral equation to treat the dipole antennas and the finite difference time domain technique to handle(More)
The paper adopts a comprehensive modeling technique to investigate the effect of frequency-dependent characteristics of grounding system in a grid-connected photovoltaic (PV) system on the overvoltages caused by lightning strikes on the nearby overhead line. In this technique, the frequency response of grounding system is determined using an electromagnetic(More)
—A great number of existing power transmission lines have aged throughout the world. A considerable proportion of them are located in the environments that exacerbate their corrosion and erosion process. In-time detection of defects necessitates the use of nondestructive testing (NDT) techniques. Scanning the lines with robots and helicopters are the(More)
With the increasing application of Induction Heating (IH) systems in various industries such as metallurgy, concerns about the harmonic effects and power quality of the power grid have been involved in the problems facing network operation engineers. This paper presents two methods to improve the power quality of three phase current source induction system.(More)
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