Electrical engineering

20151112-08
Study of power fluctuations and their compensation in a hybrid system with renewable energy sources
Hristiyan Kanchev, Bruno François, Zahari Zarkov, Ludmil Stoyanov, Vladimir Lazarov

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This paper deals with the combined influence of photovoltaic and different wind energy potentials and respectively the produced energy on the operation of an autonomous hybrid system. The studied system comprises a PV generator, ...  read more

20151112-07
Analysis of the torque ripple of permanent magnet synchronous motors with inset and embedded magnets
George Todorov

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This paper analyzes with magnetic field distribution and torque ripple of Permanent Magnet Synchronous Motors (PMSM) with inset and embedded magnets. An analytical model of the motor has been developed. The model uses iterative ...  read more

20160708-07
Advantages and applications of nanocrystalline magnetic materials
Vencislav Valchev

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This paper presents current stage and future trends of magnetic properties, advantages and applications of nanocrystalline magnetic materials in electronics. The advanced magnetic properties of the material are discussed and ...  read more

20160708-06
A model of a three-phase disk type synchronous generator with rare earth magnets
Nikola Georgiev

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This paper makes a study of a three-phase disk type synchronous 8 pair-pole generator with axial magnetic field and rare earth magnets. The generator consists of one rotor with sixteen rare earth magnets and two stators with ...  read more

20160708-05
Study of combined heating and power generation as distributed energy resource
Hristiyan Kanchev, Nikolay Hinov

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This paper presents a study on the possibilities for implementation of local cogeneration and trigeneration (heating, air-conditioning and electricity generation) as distributed energy resource. By the means of microturbine-based ...  read more

20160910-06
Adaptive vector control of permanent magnet synchronous motor
Emil Marinov, Tsvetomir Todorov, Zhivko Zhekov, Nikolay Petkov

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It is considered in this paper an opportunity to develop a permanent magnet synchronous motor (PMSM) vector control system with desired quality. A model reference adaptive control (MRAC) system based on hyper-stability theory ...  read more

20160910-05
Exploration of the possibilities of the variational approach for analysis of transient processes in electric circuits
Emil Panov, Miroslava Doneva

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In this paper the possibilities for application of the variational approach for analysis of transient processes in linear and non-linear electric circuits are presented. It is based on two basic theorems, which were introduced ...  read more

20161112-04
Displacement current and Ampère’s circuital law
Ivan Bozev, Radoslav Borisov

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The existing literature about displacement current, although it is clearly defined, there are not enough publications clarifying its nature. Usually it is assumed that the electrical current is three types: conduction current, ...  read more

20170102-07
A comparative analysis of the influence of exploitation parameters on the energy efficiency of pyroceramic electric hot plates and induction hobs
Yanita Slavova, Mariya Marinova

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Over the past years, energy efficiency has become a current issue of great concern in all spheres of industry and household sector. This paper presents a comparative analysis of the consumed electric power and the efficiency ...  read more