Search results for: M S Naderi
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IEEE Transactions on Power Delivery > 2014 > 29 > 3 > 1192 - 1202
During power swings, the distance protection may experience maloperation. Most recently, practical distance protection has used the rate of change of power system parameters. For example, the speed of the impedance trajectory movement through the blinder characteristics is generally used to distinguish between the fault and power swing. These methods experience maloperation in the external faults...
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Power transformers are one of the most expensive components of the power system. Timely detection of fault arose in the transformer can be used to prevent unwanted outage of transformer and repair costs. Using electromagnetic waves has recently been proposed for on-line monitoring of the transformer. The presence of the tank in the transformer structure causes problem for analyzing the electromagnetic...
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Dielectric diagnosis with polarization and depolarization currents (PDC) which employs the dielectric response of system in time domain is applied to investigate differences between PDC patterns produced by two types of transformer insulating fluids, mineral and bio-degradable oil. The mineral oil used is Shell Diala BX, and the biodegradable one is Envirotemp FR3. The latter is ester-based, and a...
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The drive to improve energy efficiency and reduce electrical loading has resulted in energy efficient lighting such as compact fluorescent lamps (CFLs) replacing conventional incandescent lamps. However, the presence of such non-linear loads has brought about the injection of voltage and current harmonics into electrical networks. As transformers are the interface between the supply and the non-linear...
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Ultra Wide Band (UWB) radio frequency method for allocating partial discharge (PD) is a new method for PD source localization on power transformers which is based on diamond shape multi-antenna PD detection and Huygens-Fresnel principle. Preparing a simulation environment is the first step to achieve this goal. In this paper, a three-dimensional simulation is performed using CST software and the PD...
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In order to reduce time out of the transformer circuit, implementation of methods for online monitoring is important. Using electromagnetic waves has recently been proposed for on-line monitoring of the transformer. In this paper, a new analytical method based on locus of objects in space to detect the radial deformation of winding, is proposed. The proposed experimental set-up for this method has...
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Single phase consumers do not impose equal current flows in a three phase LV network like three phase consumers and current values are different at different times of a day. Consequently, they inject unbalanced current in the distribution network which may lead to unbalanced voltages more than the standard values. In this paper a novel and practical single phase DG system with control unit is introduced...
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In this paper, a Honey Bee Mating Optimization based Fuzzy (HBMOF) controller is proposed for solution of the Load Frequency Control (LFC) problem in a restructured power system. In the proposed method, for achieving the desired level of robust performance, exact tuning of the PID parameters is very important. Hence, to reduce the design effort and find a better fuzzy system control, PID parameters...
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HVDC transmission systems can overcome some inherent limitations of AC transmission systems such as transmission between over long distances and transmission via cables. One of the important aspects of HVDC systems is the improvement of stability can be achieved by AC/DC transmission systems. This paper presents a new LQG/LTR robust controller method, which can be used for small signal stability improvement...
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HVDC transmission systems can overcome some inherent limitations of AC transmission systems such as transmission between over long distances and transmission via cables. One of the important aspects of HVDC systems is the improvement of stability can be achieved by AC/DC transmission systems. This paper presents a new QG/LTR robust controller method, which can be used for small signal stability improvement...
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Optimal tuning of Power System Stabilizers (PSSs) parameters using genetic algorithm is presented in this paper. Selecting the parameters of power system stabilizers which simultaneously stabilize system oscillations is converted to a simple optimization problem which is solved by a genetic algorithm. The advantage of Genetic Algorithm (GA) technique for tuning the PSS parameters is that it is independent...
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Harmonics tracking as well as symmetrical components identification are of the great importance in Power Quality (PQ) evaluation and improvement. In this paper, a new approach for fast and accurate estimation of fundamental and harmonic symmetrical components is presented. Firstly, the three-phase input signals are simplified into a real-imaginary system using Park vector. Then, the resulted signal...
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Electrical Engineering > 2007 > 90 > 2 > 79-85
In the case of a fault occurrence, the pattern of the fault currents obtained by the standard impulse tests contains a typical signature of the nature and the location of the insulation failure involved. This paper presents a new approach to classify the pattern of the arc discharge location as one of the important types of internal incipient faults in transformer windings. The continuous wavelet...
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Electrical Engineering > 2004 > 86 > 5 > 255-260
In this paper, a novel and accurate method is presented for evaluating the series and parallel resistances for detailed modeling of power transformers. In the proposed method, the black box model of power transformers as well as the natural frequencies of its winding are estimated by the impulse test. Then the series and parallel resistances can be evaluated for most upper and lower natural frequencies...
