Electrical engineering

20190910-02
Overall robust optimization approach for electron beam induced grafting process
Lilyana Koleva, Elena Koleva, Monica R. Nemtanu, Mirela Braşoveanu

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The article presents a review of how to pick or design the correct most cost-effective BLDC (Brushless Direct Current) motor controller to fit the needs of the project. After a brief overview of the history and presenting ...  read more

20190708-01
Modeling multi-layered soil by equivalent uniform and two-layer soil models in grounding applications
Marinko Barukčić, Nenad N. Cvetković, Željko Hederić, Toni Varga

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The soil models are crucial for calculating the performances of the grounding systems in electrical engineering. Usually, some approximations and simplified calculation procedures are used in engineering practice. These procedures ...  read more

20190102-06
Analysis of the risks imposed on UAVs in outer space missions
Vasil Vasilev, Emil Vladkov

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The article represents an overview of the different hazards for the operation of Unmanned Aerial Vehicles (UAV) in particular spacecrafts due to the environment in outer space. After a brief history overview of the human inventions ...  read more

20190102-05
Improved wind turbine control using maximum torque per ampere control strategy taking into account the magnetic saturation
Boris Demirkov

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This paper represents an approach for improving the maximum torque per ampere (MTPA) control strategy for permanent magnet synchronous generator (PMSG). The MTPA permits the optimization of the generator stator current for ...  read more

20190102-04
Some features for calibration of analyzers of electric power by power factor
Plamen Tzvetkov, Krasimir Galabov, Ivan Kodjabashev

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In relation to the calibration of analyzers of electric power, the mathematical model of the power factor is represented by its dependence on the phase angle of voltage and current of the first harmonic as well as on the general ...  read more

20181112-01
Analysis of typical faults in the real grid of 22 kV Roha town feeder (India)
Vikas Gaikwad, Angel Tcolov, Ivan Yatchev

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The fault analysis and evaluation of fault voltage and current in the power system network is very important for a stable and reliable operation of the power system. In the present paper, a study of various reasons for faults ...  read more

20181112-02
Some features and opportunities for calibration of analyzers of electric power by total harmonic distortion
Plamen Tzvetkov, Krasimir Galabov, Ivan Kodjabashev

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The possibility for evaluation of the quality of electrical energy for the purpose of calibration of analyzers is considered by using a periodic square-wave pulse signal instead of the traditionally used harmonic signals. ...  read more

20181112-03
Hysteresis loss analysis of magnetic materials with data acquisition system
Ivaylo Nedelchev

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Magnetic materials are widespread in many fields of the electronics and electrical engineering. The most of them take place in the constructions of transformers, coil cores, electromagnets, measurement sensors etc. Thus, their ...  read more

20140304-05
Optimization of the structure and the distribution of the reactive power compensation in the industrial electrical supply systems
Nikolay Matanov

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The compensation of the reactive loads is fundamental for improving the quality of the industrial electrical supply and decreasing the losses of active power in the distribution grids. Regarding energy efficiency, capacitor ...  read more

20140708-08
Study of the uncertainty measuring of the detonation velocity in a waveguide of non-electric blasting system
Milka D. Vicheva, Georgi S. Stanchev

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The block-diagram of equipment for measuring the velocity of detonation in non-electrical waveguides for blasting is developed. Calibrated time intervals between two pulses corresponding to the specified distance between the ...  read more