Electrical engineering

20210304-02
EEG classification for BCI using genetic algorithm and k-fold cross validation
Ivaylo E. Ivaylov

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Brain-Computer Interfaces (BCIs) have become popular in the last years and are used for several applications in human-computer interfaces including attention and workload measures as well as for direct control of objects. ...  read more

20210304-03
Impact of an energy conservation measure on reducing CO2 emissions
Mila Ilieva-Obretenova

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The study uses saved energy (the expected annual economy of electrical energy) to describe the impact of energy conservation measure (М1) – Reconstruction of the electric drive and control of a basic hoisting machine, ...  read more

20210102-02
Influence of the middle pole shape on the force characteristic of an actuator with Т-shaped armature
Ivan Hadzhiev, Dian Malamov, Iosko Balabozov, Ivan Yatchev

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In the paper, a study of the influence of the middle pole shape on the static force characteristic of a direct-current solenoid actuator with T-shaped armature is presented. For this purpose, computer models of the actuator ...  read more

20200912-03
Physical modeling of wind energy conversion systems in laboratory conditions
Zahari Zarkov

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The article presents the experience of the author in the area of the physical modeling of wind energy conversion systems (WECS) with different types of electric generators and electronic converters. A small power test benches ...  read more

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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This paper presents the implementation of the overall desirability function – the overall robust optimization approach – for multi-criteria parameter optimization in the robust engineering case, based on estimated models ...  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