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In recent years, the electromagnetic wave application has been proposed for the detection of mechanical defects in power transformer windings. After detection of a defect, the determination of defect type is the next stage of monitoring. In this paper, a comparative method is presented to discriminate between radial deformation and axial displacement in power transformer high-voltage winding using...
In this paper, three monitoring stages of detection, localization, and extent determination of radial deformation in power transformer winding using stationary ultra-wideband antennas, are investigated. For this purpose, two types of radial deformation are implemented on the actual transformer high-voltage winding. The first type is a modeled bulgy mechanical deformation, which its extent and reversibility...
Epilepsy is a common neurological disorder characterized by abnormal excessive or synchronous neural activity in brain. In this study, we develop an unsupervised learning for seizure prediction. Extracting wavelet features of brain electroencephalogram (EEG), we propose a Hidden Markov Model (HMM) with a mixture of Gaussian observation model as an unsupervised learning setting for seizure prediction,...
In a distribution system and especially in rural network or industries which are so far from HV substation, it is possible to increase the power quality by compensating of reactive power using var compensators. But these equipments are expensive and need to large scale of investment. This paper presents an applicable method to define the number of static reactive power generating units and their optimal...
In a distribution system and especially in rural network or industries which are so far from HV substation, it is possible to increase the power quality by compensating of reactive power using var compensators. But these equipments are expensive and need to large scale of investment. This paper presents an applicable method to define the number of static reactive power generating units and their optimal...
In this paper, a small hybrid power generation system comprising a wind turbine and a fuel cell is simulated. Due to the fluctuating nature of wind power, another energy source should be integrated with the wind turbine to ensure reliable and efficient operation of the power system. Dynamic simulation of a wind fuel cell hybrid energy system is performed, and the results are presented. This study...
In this paper, a method for developing optimal bidding strategies for load server entities (LSE) is presented. The market structure consists of a day-ahead market and a real time market. The LSE's objective is to minimize the total cost of purchasing power from two markets. Given the expected demand and the two market price forecasts, the quantity which should be purchased in each market and demand...
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